Double Stars - Sketches

A detailed description of the project, the data sources, additional websites and how you can contribute visual observations and photographs of double stars to the project are summarized in our introduction.

Double Star Lists:
Double/Multiple Stars 389
Visual Observations 1616
Sketches 524
Photographs 54
Observers 17
Werner E. Celnik, Berthold Fuchs, Sarah Gebauer, Christopher Hay, Claus-Dieter Jahn, Gerd Kohler, Karsten Kopp, Winfried Kräling, Jens Leich, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, John Raymond, Jörg S. Schlimmer, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000.0)
★★★ STTA254, WZ Cas AB 7m.4 8m.3 57.8" 89° 2019 Cas 00h01m15.85s / +60°21'19.00"
AC 7m.4 9m.6 155.4" 324° 2015
AD 7m.4 10m.3 181.4" 118° 2016
Christopher Hay
Seeheim (Germany)
6x24 AB: Clearly split. A definitely brighter than B. Under a NELM 5m5 sky both components appear weak in these mini-binoculars and no colour impression arises.;
WZ Cas is the variable designation of component A of STTA254. This semiregular carbon star has a mean brightness range of 6m8 to 7m7, and can reach extreme values of 6m3 at one end and 8m8 at the other. Perhaps it was too deep in a minimum at the time of observation to show colour with 1 inch of aperture? 15x45 binoculars revealed colour in this night, see observation below.
Christopher Hay
Seeheim (Germany)
15x45 AB: Wide split. A orange-red, B no particular colour. NELM 5m5, same night as 6x24 observation above.
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2020-08-19: Intense orange & bluish. Very striking.
René Merting
Drachhausen (Germany)
16x70 AB: ein schöner Fernglas-Doppelstern - Komponente A im Westen präsentiert sich dunkelgelb (noch nicht orange), B im Osten ist eher weißlich
René Merting
Drachhausen (Germany)
18x70 AB: ein sehr auffälliger Doppelstern mit einem schönen Farbkontrast - A strahlt gelb, das kurz davor steht, ins Orange über zu gleiten - B wirkt im Kontrast aquamarin, so dezent wie eine typische PN-Farbe
Robert Zebahl
Leipzig (Germany)
80mm (33x) AB: Nice double star. Brighter component appeared orange, the fainter more bluish.
René Merting
Drachhausen (Germany)
100mm (20x) AB: 20x reicht zwar schon für eine klare Trennung, aber Komponente B im Osten ist nur dumpf grau-blau und noch zu schwach für den schönen Farbkontrast, der sich bei 32x offenbart - Komponente A strahlt dann in einem satten Bernsteingelb, B im Osten gibt sich unterkühlt bläulich - Helligkeitsunterschied 1 bis 1.5 Größenklassen, schwierig abschätzbar wegen der Farben
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: Splendid view. Primary component clearly orange, secondary blue. ../projects/double-stars/robert-zebahl/sketches/2019-08-22_wz_cas.jpg
Jörg S. Schlimmer
Germany
127mm (136x) Sehr schöner Farbkontrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_WZ_Cas_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: WZ Cas: Pretty, deep orange A and very wide half delta mag B, white.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein weit getrenntes Pärchen mit wunderschönen Farbkontrast, Komponente A im Westen ist grell-orange und die gut 1.5 Magnituden schwächere Komponente B ist aquamarin-grau
Robert Zebahl
Leipzig (Germany)
102mm ../projects/double-stars/robert-zebahl/photographs/2019-07-16_wz_cas.jpg
STF3056 AB 7m.7 8m.1 0.7" 143° 2018 And 00h04m40.09s / +34°15'54.70"
AB-C 7m.1 10m.1 26.3" 2017
AB-D 7m.1 10m.6 95.2" 238° 2020
CD 10m.1 10m.6 113.1" 227° 2015

../images/binary-star-orbits/STF3056-AB-orbit.jpg

René Merting
Drachhausen (Germany)
76mm (29x) AB-C: bei 29x ist nach Norden eine ganz schwache Komponente erkennbar, gut getrennt - AB wirkt leicht gelblich, C eher kupfergrau
Sarah Gebauer
Germany
100mm (73x) die Komponenten AB erscheinen als ein Stern, C liegt nördlich davon und ist wesentlich schwächer und Komponente D, die ähnlich hell wie C erscheint, liegt westlich von AB gesehen ../projects/double-stars/sarah-gebauer/sketches/STF%203056.jpg
STT547 AB 9m.0 9m.2 5.9" 191° 2021 And 00h05m41.03s / +45°48'43.30"

../images/binary-star-orbits/STT547-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STT547-AB-orbit-solution-2.jpg

René Merting
Drachhausen (Germany)
100mm (32x) bei 64x klare Trennung - ein relativ schwaches Pärchen - zurück auf 32x stehen beide dichter zusammen und können knapp getrennt werden
Uwe Pilz
Leipzig (Germany)
105mm (144x) Der nahe gelegene ß997 konnte nicht getrennt werden ../projects/double-stars/uwe-pilz/sketches/191123stt547.jpg
STF3062, V640 Cas 6m.4 7m.3 1.5" 2020 Cas 00h06m15.81s / +58°26'12.50"

../images/binary-star-orbits/STF3062-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (129x) Nice view, clearly split, but tight with visible difference in brightness.
Mark McCarthy
Fremont (California/USA)
152mm (175x) : A nice double-double with STF 3057, near equal and closely split
Frederik Wanink
Itterbeck (Germany)
254mm (460x) leicht ../projects/double-stars/frederik-wanink/sketches/STF3062.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Light yellow and a more orange yellow B, 3-4", 1 delta mag. PC (70.07 L.Y.)
René Merting
Drachhausen (Germany)
320mm (320x) erst bei 320x ist Komponente B knapp getrennt nördlich von A zu erkennen - beide Sterne sind relativ hell und haben relativ große Beugungsscheibchen, so dass die Trennung nur knapp zu sehen ist - nicht wirklich schön, wenn man in den Nächten vorher mit einem Refraktor Doppelsterne beobachtet hat
STF2 6m.7 6m.9 0.9" 15° 2019 Cep 00h09m20.18s / +79°42'52.40"

../images/binary-star-orbits/STF2-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) Schneemann-Figur. Abstand 0“91 ../projects/double-stars/uwe-pilz/sketches/STF2.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Light orange stars, very tight, hairline split, near equal mag. Physical with a 540-year period it is to slowly widen. 22% parallax overlap, only 82 AU weighted separation, 2.16/2.10 solar mass
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2.jpg
STF3 7m.8 9m.1 5.1" 83° 2020 And 00h10m03.18s / +46°23'25.10"
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x zeigt sich der Stern leicht länglich nach Osten verzogen - bei 64x knappe Trennung, Komponente B ist eine knappe Magnitude schwächer - A weiß, B grau-orange
Uwe Pilz
Leipzig (Germany)
105mm (200x) ../projects/double-stars/uwe-pilz/sketches/191123stf3.jpg
AC1 7m.3 8m.3 1.9" 291° 2020 And 00h20m54.10s / +32°58'40.90"

../images/binary-star-orbits/AC1-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (125x) Very attractive, relatively close with a clearly visible difference in brightness. In the immediate vicinity a brighter star shines in a lovely orange. Very nice contrast! ../projects/double-stars/robert-zebahl/sketches/2019-10-22_ac1.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) orange. Leuchtend gelber Stern in 5' Abstand ../projects/double-stars/uwe-pilz/sketches/191122AC1.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Around half a delta mag, nice and close split. Physical with a 525-year period. At apastron
HJ5451 6m.0 9m.3 55.3" 86° 2012 And 00h31m25.64s / +33°34'53.90"
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelbweiß, schon bei 21x erkennbar ../projects/double-stars/uwe-pilz/sketches/191122h5451.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Orange star, wide 1 delta mag B. Spectral class K1III (yellow-orange). WDS says physical, however their parallax ranges do not overlap, -13%
H5 17, pi And, 29 And AB 4m.4 7m.1 36.2" 175° 2019 And 00h36m52.84s / +33°43'09.70"
AC 4m.4 13m.0 55.2" 356° 2016
Robert Zebahl
Leipzig (Germany)
8x44 AB: 2020-11-25: Not separable. The faint companion was probably outshone by the bright primary component.
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: 2020-11-02: Quite large separation and large difference in brightness. A: white-yellowish, B: slightly bluish.
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: (HV 17) blauweiß und violett-grau ../projects/double-stars/uwe-pilz/sketches/191122HV17.jpg
J220 10m.5 10m.5 3.0" 239° 2015 Cas 00h37m32.95s / +60°44'33.30"
Uwe Pilz
Leipzig (Germany)
120mm (180x) Sekundärstern war nur als milchige Aufhellung erkennbar. ../projects/double-stars/uwe-pilz/sketches/211222J220.jpg
HJ1986 AB 8m.0 8m.5 40.3" 67° 2018 Cep 00h39m35.16s / +84°44'52.00"
AC 8m.0 11m.2 55.8" 189° 2015
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x sehr weit getrenntes Pärchen - beide Komponenten ähnlich hell, Komponente A im SW weiß, B eine halbe Größenklasse schwächer und mehr gräulich - zurück auf 20x sind beide weiterhin weit getrennt erkennbar
Sarah Gebauer
Germany
100mm (45x) bei 45x und 1,8° GF in der Nähe des OS NGC 188 getrennt zu sehen, das Trio bildet ein spitzes, langes Dreieck ../projects/double-stars/sarah-gebauer/sketches/HJ%201986.jpg
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x sehr einfach - Komponente B im NO ist maximal eine halbe Größenklasse schwächer - Komponente A weißorange
AC: bei 45x zeigt sich C im Süden von A als ganz schwaches Lichtpünktchen - Abstand zu A etwas größer als der von AB - alle drei Sterne zusammen bilden ein flaches Dreieck, A ist die Spitze mit dem flachen Winkel
STFA1 AB 7m.2 7m.4 47.8" 47° 2018 And 00h46m24.34s / +30°56'33.50"
Robert Zebahl
Leipzig (Germany)
8x40 Large distance with visible difference in brightness. I used a tripod.
Uwe Pilz
Leipzig (Germany)
105mm (26x) zweiter Doppelstern im Bild (ohne Bezeichnung). Gelb und orange. ../projects/double-stars/uwe-pilz/sketches/190922STTI1.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) equal magnitude orange pair, wide.
H5 82 AB 8m.0 8m.3 56.8" 75° 2018 Cas 00h47m24.62s / +51°05'45.90"
René Merting
Drachhausen (Germany)
12x50 ein ansehnliches Sternpaar, in der unmittelbaren Umgebung gibt es keine konkurrierenden Sterne - beide Komponenten stehen dicht zusammen und sind etwa gleich hell
Robert Zebahl
Leipzig (Germany)
16x70 2021-10-07: Widely separated pair with rather small difference in brightness. The primary component appears in a pale orange, the companion remained colorless. Together with STF59 in field of view.
Uwe Pilz
Leipzig (Germany)
16x70 ../projects/double-stars/uwe-pilz/sketches/200918HV82.jpg
René Merting
Drachhausen (Germany)
18x70 zwei annähernd gleich helle Sterne ziemlich weit auseinander stehend - B im Osten ist nur leicht schwächer
Robert Zebahl
Leipzig (Germany)
70mm (26x) Almost equally bright components with large separation.
★★★ eta Cas, 24 Cas STF60 AB 3m.5 7m.4 13.6" 326° 2020 Cas 00h49m06.29s / +57°48'54.70"
STF60 AC 3m.5 11m.4 225.0" 260° 2000
STF60 AD 3m.5 12m.8 189.4" 354° 2011
STF60 AE 3m.5 10m.2 75.6" 126° 2015
STF60 AF 3m.5 11m.5 378.3" 276° 2000
STF60 AG 3m.5 9m.5 419.7" 259° 2012
STF60 AH 3m.5 8m.4 701.1" 355° 2012
SMR2 AI 3m.5 11m.6 90.3" 73° 2012
SMR2 AJ 3m.5 12m.3 237.1" 262° 2012

../images/binary-star-orbits/STF60-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: Easy to split with big difference in brightness. Fainter component appeared deep orange to slightly red colored, brighter component tends to be more slightly yellowish.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist Komponente A so hell, dass B trotz des augenscheinlich großen Abstandes von 13,4" nur knapp getrennt zu sehen ist - Komponente A ist gleißend hell-gelb, B dürfte mindestens 3 Größenklassen schwächer sein und wirkt dadurch dumpfer
Uwe Pilz
Leipzig (Germany)
105mm (53x) AB: leicht
Uwe Pilz
Leipzig (Germany)
105mm (288x) kein Sternentstehungsgebiet! ../projects/double-stars/uwe-pilz/sketches/etaCas.jpg
Sarah Gebauer
Germany
150mm (54x) AB: bei 54x erst nur einen Stern gesehen, doch da, ganz schwach darunter doch die wesentlich schwächere, zweite Komponente entdeckt ../projects/double-stars/sarah-gebauer/sketches/20200731%20Eta%20Cas%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (30x) AB: 2021-09-11: Light yellow & red-brownish.
Winfried Kräling
Marburg (Germany)
152mm (175x) ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2055UT-Eta%20Cassiopaia.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice yellow pair. A is a red tainted yellow, B is cleaner.
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x ein echt fetter Farbkontrast, Komponente A ist gleißend hell und zitronengelb, B zeigt sich knallig orange - beide Sterne sind gut getrennt voneinander zu beobachten - sehenswert
★★ STF73, 36 And AB 6m.1 6m.5 1.2" 335° 2020 And 00h54m58.02s / +23°37'42.40"
Sarah Gebauer
Germany
100mm (136x) beide Sterne tanzen wild umeinander herum, blickweise ist er kurz getrennt
Robert Zebahl
Leipzig (Germany)
102mm (125x) Clearly visible as figure '8' with a rather small difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (198x) ganz einfach
Uwe Pilz
Leipzig (Germany)
105mm (240x) gelb und weiß ../projects/double-stars/uwe-pilz/sketches/20120336And.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Superfine near equal yellow-orange stars, nice! Binary with 167.5-year period. It is nearly at apastron and will widen very slightly by 2040
Robert Zebahl
Leipzig (Germany)
152mm (300x) Split with little gap in between and little difference in brightness. Seeing was not really good.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) hell ../projects/double-stars/frederik-wanink/sketches/36And.jpg
STT21 6m.8 8m.1 1.3" 176° 2020 And 01h03m01.54s / +47°22'34.10"

../images/binary-star-orbits/STT21-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-11-02: The double star appears clearly elongated, but with no visible notch.
Uwe Pilz
Leipzig (Germany)
120mm (180x) weiß ../projects/double-stars/uwe-pilz/sketches/201105STT21.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Nice pale yellow bright stars, ~2 delta mag, needed 333x clearly resolve, ~1". Physical pair with 450 year period
BU397 AB 7m.5 10m.2 8.7" 142° 2015 And 01h07m49.57s / +46°50'31.60"
Uwe Pilz
Leipzig (Germany)
120mm (128x) schwierig ../projects/double-stars/uwe-pilz/sketches/201104beta397.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) AB is an easy pale gold A and blue B. AC more difficult since C is much fainter, seen only with averted vision at twice the separation as B, and about forty degrees wider PA
STT515, phi And, 42 And AB 4m.6 5m.6 0.5" 114° 2021 And 01h09m30.12s / +47°14'30.60"

../images/binary-star-orbits/STT515-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (280x) 2020-11-04: Seeing 3-4/5; In no way separable or detectable as a double star.
Uwe Pilz
Leipzig (Germany)
120mm (180x) ../projects/double-stars/uwe-pilz/sketches/201104PhiAnd.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) 2020-11-06: Seeing 3/5; Not detectable as a double star.
Mark McCarthy
Fremont (California/USA)
508mm (677x) Phi And. I get elongation in the speckle matter, but no better resolution. Bright 0.52" pair
BU235 Aa-Ab 7m.5 7m.8 0.8" 143° 2018 Cas 01h10m34.31s / +51°00'47.80"

../images/binary-star-orbits/BU235-Aa-Ab-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) Mehrfachsystem ../projects/double-stars/frederik-wanink/sketches/BU235.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Amazing system with five faint pairings, but the main attraction is Aa-Ab, near equal bright A, hairline at 205x and and a nice clean split at 333x, light yellow stars, slight magnitude difference. Seeing giving me nice round disks. Terrific. Physical pair with a 278 year period. Amazingly, Burnham discovered this with his 6-inch
STF96 7m.9 8m.9 0.9" 287° 2018 Cas 01h12m41.24s / +65°00'32.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) scheint enger als 0,9" ../projects/double-stars/frederik-wanink/sketches/STF96.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Mostly notched but moments of hairline split with seeing 1.5 delta mag. Very tough! Yellow-orange stars.
STF102 AB 7m.3 9m.2 0.5" 271° 2016 And 01h17m47.96s / +49°00'30.50"
AB-C 7m.2 8m.8 10.2" 223° 2016
AB-D 7m.2 10m.8 23.6" 58° 2016
CD 8m.8 10m.8 33.5" 54° 2015
DE 10m.8 10m.2 98.5" 356° 2015
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB-C: 2020-11-02: At 28x clearly separated, fairly close together with a clear difference in brightness. The close pair AB appeared whitish with faint companion C. At 62x AB appeared white-yellowish, C grey-blue.
Uwe Pilz
Leipzig (Germany)
120mm (128x) AB-D ../projects/double-stars/uwe-pilz/sketches/201104stf102.jpg
STF155 AB 7m.9 8m.0 4.9" 325° 2018 Psc 01h44m15.19s / +09°29'02.70"
Robert Zebahl
Leipzig (Germany)
70mm (44x) Lovely embedded in a small group of stars. The components showed a small difference in brightness and were very close together. ../projects/double-stars/robert-zebahl/sketches/2019-10-24_stf155.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice near equal brightness white pair, ~5"
STF154 8m.6 8m.8 5.1" 127° 2020 And 01h45m02.50s / +43°42'22.80"
Robert Zebahl
Leipzig (Germany)
102mm (62x) 2020-11-02: At 28x clearly elongated, at 62x very finely separated with similar bright components. Pale orange & pale blue. At 125x similar color impression.
Uwe Pilz
Leipzig (Germany)
120mm (128x) ../projects/double-stars/uwe-pilz/sketches/201104STF154.jpg
★★ 1 Ari, STF174 6m.3 7m.2 2.9" 164° 2018 Ari 01h50m08.60s / +22°16'29.50"
Robert Zebahl
Leipzig (Germany)
63mm (46x) Clearly split, but tight with noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (80x) At 67x pretty tight pair, but separated with a clear difference in brightness. The primary component appeared in a hint of orange. At 80x easy to separate.
Christopher Hay
Seeheim (Germany)
76mm (83x) 1 Arietis is clearly orange (not split) in 12x42 finder. In 3-inch at 83x fine split, primary fiery orange. At 100x split becomes more obvious, at 125x easy, but at expense of loss of colour.
Stefan Loibl
Rosenheim (Germany)
102mm (102x) slight color difference, A orange, B blueish
Sarah Gebauer
Germany
150mm (27x) im Dezember 2019 nicht getrennt ../projects/double-stars/sarah-gebauer/sketches/20191230%201%20Ari%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (100x) Conditions in the target region: SQM-L 20.8
Nice double star with big difference in brightness.
Mark McCarthy
Fremont (California/USA)
203mm (533x) 1 Ari. ! Very beautiful yellow-orange A and robin's egg blue B, 3", one delta mag. probably one of the best color pairs
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue pair, ~2 delta mag, ~2".
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern mit schon auffälligem Helligkeitsunterschied. Der hellere leuchtet gelblich und der schwächere geht ins bläuliche. Schöner Doppelstern.
STF179 7m.6 8m.1 3.5" 160° 2018 And 01h53m10.72s / +37°19'16.30"
Robert Zebahl
Leipzig (Germany)
102mm (62x) 2020-11-02: At 62x very nice sight! Finely separated pair of almost equally bright components. At 125x a small difference in brightness is visible. Pale orange & slightly bluish.
Uwe Pilz
Leipzig (Germany)
120mm (150x) ../projects/double-stars/uwe-pilz/sketches/201104stf179.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal magnitude, 4", nice orange-yellow color.
STF183 AB-C 7m.7 9m.3 5.6" 162° 2018 Tri 01h55m07.39s / +28°47'52.60"
Sarah Gebauer
Germany
100mm (73x) die schwächere Komponente wurde erst auf den zweiten Blick sichtbar, eine reizvolle Konzentrationsübung ../projects/double-stars/sarah-gebauer/sketches/STF%20183.jpg
★★ H5 12, 9 Ari, lambda Ari AB 4m.8 6m.7 37.3" 48° 2020 Ari 01h57m55.71s / +23°35'45.80"
Robert Zebahl
Leipzig (Germany)
8x44 2020-11-25: Easily separable with noticeable difference in brightness. Primary component appeared slightly yellowish with dim companion.
Robert Zebahl
Leipzig (Germany)
70mm (15x) Easy to split with large distance and difference in brightness.
Stefan Loibl
Rosenheim (Germany)
102mm (41x) easily split, both components white, no color difference
Uwe Pilz
Leipzig (Germany)
105mm (200x) der helle Stern ist blauweiß ../projects/double-stars/uwe-pilz/sketches/191025_LamAri.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) AB: A strong pair dominating the 0.6° field of view. B presents a weak ochre colour tone, in charming contrast to pearly-white component A.
According to Stelledoppie a physical pair at a distance to us of 129 light years.
alpha Psc, 113 Psc, Alrischa, Kaitain, Okda STF202 AB 4m.1 5m.2 1.9" 264° 2019 Psc 02h02m02.80s / +02°45'49.40"
PWL1 AC 4m.1 8m.2 404.9" 63° 2006
PWL1 AD 4m.1 8m.6 434.5" 335° 2006

../images/binary-star-orbits/STF202-AB-orbit.jpg

Winfried Kräling
Marburg (Germany)
102mm (178x) AB ../projects/double-stars/winfried-kraeling/sketches/2022-01-06-1625UT-alpha%20Psc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: der hellere Stern ist weiß ../projects/double-stars/uwe-pilz/sketches/191129alpPsc.jpg
STF208, 10 Ari AB 5m.8 7m.9 1.3" 349° 2018 Ari 02h03m39.26s / +25°56'07.60"

../images/binary-star-orbits/STF208-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (200x) helle Stelle im ersten Ring ../projects/double-stars/uwe-pilz/sketches/10Ari.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) ~2 delta mag, ~1" very nice. ~1 disk split. Nice!
★★★ gamma And, 57 And, Alamak STF205 A-BC 2m.3 5m.0 9.5" 63° 2021 And 02h03m53.92s / +42°19'47.50"
STT38 BC 5m.3 6m.5 0.3" 120° 2021
BAR22 AD 2m.3 15m.0 27.9" 245° 1898

../images/binary-star-orbits/STT38-BC-orbit.jpg

Robert Zebahl
Leipzig (Germany)
63mm (42x) A-BC: Easy to split with quite large difference in brightness.
Christopher Hay
Seeheim (Germany)
71mm (32x) Fine split. A is mandarine orange. BC has trouble displaying its colour due to the overpowering light of A, but in good moments is clearly blue.
A-BC is a physical double at a distance to us of 393 light years.
BC is also physical, with a relatively short period of 63 years for C to circle B and a very tight periastron. Unobservable in 2013 at periastron with 0.1". Since then the angular separation has been widening rapidly and will reach 0.4" in 2029. B-C will then become observable in large amateur telescopes for three decades, after which C will fall quickly back to B.
Uwe Pilz
Leipzig (Germany)
105mm (52x) A-BC: einfach
Uwe Pilz
Leipzig (Germany)
120mm (128x) A-BC ../projects/double-stars/uwe-pilz/sketches/201105GammaAnd.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) A-BC: Very easy. A: orange, BC: rather white.
Christopher Hay
Seeheim (Germany)
180mm (110x) A very strong pair in 0.6° FOV with powerful colour contrast, A yellow, BC ice blue.
René Merting
Drachhausen (Germany)
320mm (45x) A-BC: bei 45x ein knapp getrenntes Pärchen - Komponente A knallgelb mit einem Anhängsel nordöstlich - Komponente BC strahlt 3 Größenklassen schwächer - bei 144x wirkt BC grün-weiß, bei 45x war der Eindruck noch leicht gelblich
Mark McCarthy
Fremont (California/USA)
508mm (667x) BC: Component of STF 205, of which A is a brilliant orange and BC bright blue. In BC I can only see elongation through the speckle at 667x and 1067x. Short 62.63 year period which will get "easier" to about 0.2" by 2045
Mark McCarthy
Fremont (California/USA)
508mm (1067x) BC: I spent a good long while on this one, and tried hard to nail down the position angle. At 1067x, both with and without an apodising mask, but both times with a #80A light blue filter, which did seem to calm the diffraction a little, I had a clear view of the elongation with a strong sense of the weaker end being to the East or to the ESE. I also tried a 78% central obstruction mask, and while the diffraction became a grid, and the disks much smaller, I could clearly see the same elongation and weaker end, though at a much smaller scale. To my delight the current orbital solution puts the PA at 120.6-degrees, 0.179" separation, so I think I have detected it. I can't wait until 2033 when this becomes an easy pair!
Winfried Kräling
Marburg (Germany)
127mm A-BC: Aufnahme vom 11.09.2020 am 127/1200mm Refraktor mit Barlowlinse (~2.5x)
Weit getrennt, Komponente A: goldgelb bis orange, Komponente BC: weißlich blau
../projects/double-stars/winfried-kraeling/photographs/2020-09-11-2012UT-Doppelstern-Gamma%20And.jpg
Werner E. Celnik
Rheinberg (Germany)
150mm A-BC ../projects/double-stars/werner-celnik/photographs/GammaAnd%202011-10-31%201800UT%20Refr_150-1100%20DBK21_Col%207ms%205minGIOTTOMittel7500fr%20A10436%20kl.jpg
★★★ STF227, iota Tri, 6 Tri 5m.3 6m.7 4.0" 68° 2019 Tri 02h12m22.28s / +30°18'11.10"

../images/binary-star-orbits/STF227-orbit-solution-1.jpg ../images/binary-star-orbits/STF227-orbit-solution-2.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x even separable with a clear difference in brightness, whereby the companion is almost outshone by the primary component. At 57x easy to separate. Primary component shines in bright orange, companion slightly orange. Beautiful sight together with STF232 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2019-12-12_6_tri_stf232.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und blau ../projects/double-stars/uwe-pilz/sketches/191230stf227.jpg
Christopher Hay
Seeheim (Germany)
180mm (110x) Well separated. Primary yellowish, secondary light blue. When 6 Tri drifts out of 0.6° FOV, STF232 drifts in.
6 Tri is a physical double at a distance to us of 291 light years.
Mark McCarthy
Fremont (California/USA)
203mm (205x) 6 Tri. Yellow A, white b, pretty. Wide, about two delta mag
Frederik Wanink
Itterbeck (Germany)
254mm (200x) Helligkeitsunterschied deutlich
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist noch gut zu trennen und der Helligkeitsunterschied ist mit gut 1,5 mag schon sehr auffällig. Der hellere Stern erstrahlt schön gelblich, der schwächer weiß. In den Momenten der wirklich ruhigen Luft, ein sehr schöner Doppelstern
★★★ STF231, 66 Cet AB 5m.7 7m.7 16.8" 235° 2019 Cet 02h12m47.54s / -02°23'37.10"
Christopher Hay
Seeheim (Germany)
30x80 Wide split. A is cream-white, B of indeterminate colour. Attractive pair in 1.7° FOV, scenery accentuated by 63 Psc about 3/4° to northwest.
While pleasant with 30x80, the pair becomes suprisingly difficult to split with 20x80, presumably due to the cumulative effect of 2m delta-mag and the red colour of the companion, which makes it stand out less than if it were blue (colour not seen, but stressed by Uwe Pilz in his 105mm observation, see below).
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und leuchtend rot! ../projects/double-stars/uwe-pilz/sketches/191129_66Cet.jpg
STF240 8m.3 8m.6 4.8" 52° 2018 Ari 02h17m15.74s / +23°52'24.80"
Sarah Gebauer
Germany
100mm (136x) trotz gar nicht so geringen Abstands doch ein sehr enges und feines Pärchen, das die Nase eines Grinsegesichtes bildet ../projects/double-stars/sarah-gebauer/sketches/STF%20240.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Faint but pretty wide separation ~4", equal magnitude yellowish-white.
★★ iota Cas, STF262 & CHR6 CHR6 Aa-Ab 4m.6 8m.5 0.6" 42° 2010 Cas 02h29m03.96s / +67°24'08.70"
STF262 AB 4m.6 6m.9 2.9" 230° 2017
STF262 AC 4m.6 9m.1 6.7" 117° 2015
STF262 AD 4m.6 8m.5 210.9" 60° 2016

../images/binary-star-orbits/CHR6-Aa-Ab-orbit.jpg ../images/binary-star-orbits/STF262-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) Only the D component was well visible. The components B & C were not visible even at magnifications up to 167x. The sky was clearly brightened (Bortle 7).
Robert Zebahl
Leipzig (Germany)
70mm (120x) Components A, B and C pretty close together, D far apart. Component B appeared slightly elongated on the first diffraction ring of the primary component. Rewarding! ../projects/double-stars/robert-zebahl/sketches/2019-08-25_iota_cas.jpg
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 142x zeigt sich Komponente B im SW mit gut einem Drittel das Abstandes AC, Helligkeitsunterschied 1.5 bis 2 Größenklassen
AC: bei 64x getrennt, schöner Farbkontrast, Komponente A ist weiß mit einem Stich ins Gelbe, C leicht bräunlich
AD: bei 32x extrem weiter Abstand zwischen A und D, Helligkeitsunterschied mehr als 2 Größenklassen (laut Stelle Doppie sogar 3.85 mag)
Uwe Pilz
Leipzig (Germany)
105mm (200x) Dreifachstern lohnend ../projects/double-stars/uwe-pilz/sketches/iotaCas.jpg
Sarah Gebauer
Germany
150mm (160x) bei 160x sind die Komponenten AC getrennt, B leider nicht, die schwache Komponente C versinkt fast im Strahlen der hellen Komponente A, ein sehr reizvoller Anblick! Von Komponente D wusste ich während der Beobachtung noch nichts, sie taucht unter den Feldsternen der Zeichnung auch auf ../projects/double-stars/sarah-gebauer/sketches/20200731%20Iota%20Cas%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Component D easy to see even at lowest magnification. Component C is also easily visible at 49x. At 69x the component B is indicated, at 100x clearly visible. C appears slightly grey-bluish and obviously fainter than B. Grand sight at 129x!
Mark McCarthy
Fremont (California/USA)
508mm (1067x) CHR6 (Aa-Ab): This is a component of Iota Cas, STF 262 (which is a really pretty triple). CHR 6 at 1067x and seeing through the speckle image, I get elongation with a suspected blunter end which I assume is the B side, PA to the north [it's actually to the south -- my general orientation is correct but mis-interpret the brighter end]. Physical with 47 year period, currently at periastron and will tighten to 0.2" by 2036
★★ 30 Ari STFA5 AB 6m.5 7m.0 37.9" 275° 2019 Ari 02h37m00.52s / +24°38'50.00"
RAO8 BC 7m.0 11m.0 0.6" 282° 2018
Robert Zebahl
Leipzig (Germany)
8x44 AB: 2020-11-25: Easy to split at still quite small separation and visible difference in brightness. The primary component appeared white-yellowish, the companion darker.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: At 22x widely separated, striking with a rather small difference in brightness. A seemed a bit warmer in color compared to B with a hint of orange. At 44x, both seemed slightly orange with very little difference in color.
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: trennbar bei 22x. Weiß und blau ../projects/double-stars/uwe-pilz/sketches/191230_30Ari.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Near equal light orange, very wide. B has a C pair 0.6" and 4 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Near equal magnitude, wide separated, PA to WSW
STF291 AB 7m.7 7m.5 3.4" 117° 2020 Ari 02h41m06.59s / +18°48'00.70"
AC 7m.7 9m.5 65.5" 242° 2015
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: At 44x almost, at 57x clearly split, but still very tight with rather small difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (88x) hellster Stern gelb, andere Farben nicht erkennbar ../projects/double-stars/uwe-pilz/sketches/191230stf291.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: White stars, near equal, close but well split, makes a 2+1 with a ~2 delta mag, very wide C
STF295, 84 Cet 5m.8 9m.7 3.9" 302° 2016 Cet 02h41m14.00s / -00°41'44.40"

../images/binary-star-orbits/STF295-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (160x) Quite easy at a moderate distance, whereby the companion appeared rather faint and was best visible with averted vision.
Uwe Pilz
Leipzig (Germany)
105mm (144x) trotz diesigem Himmel bei 144x indirekt erkennbar. Schwieriger bei 200x ../projects/double-stars/uwe-pilz/sketches/200111_84Cet.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Easy. The quite dim companion is immediately visible in moderate distance clearly outside of the first diffraction ring despite few, high clouds. The primary component appeared white-yellowish.
gamma Cet, 86 Cet, Kaffaljidhma STF299 AB 3m.5 6m.2 1.9" 299° 2020 Cet 02h43m18.04s / +03°14'08.90"
ALD124 AC 3m.5 10m.2 843.1" 306° 2000
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 142x wirkt der Doppelstern leicht länglich, die Beugungsscheibchen sind jetzt schon zu groß (mittleres Seeing), um sinnvoll weiter zu vergrößern
Winfried Kräling
Marburg (Germany)
102mm (178x) AB ../projects/double-stars/winfried-kraeling/sketches/2022-01-06-1635UT-gamma%20Cet.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: extrem schwierig ../projects/double-stars/uwe-pilz/sketches/191129gammaCet.jpg
STF301 7m.8 8m.7 8.2" 18° 2016 Per 02h47m38.75s / +53°56'35.80"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Rather faint double star with a handful of other stars in the immediate vicinity. At 22x clearly separated, but still close together with visible difference in brightness. At 31x the primary component looked slightly orange.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ganz knapp getrenntes Pärchen - Komponente B im Norden ist eine halbe Größenklasse schwächer - nett anzusehen
Sarah Gebauer
Germany
100mm (45x) bei 45x ganz knapp schon getrennt und täuscht einen Farbunterschied vor: die südwestliche Komponente wirkt leicht orange, die nordöstliche etwas bläulich ../projects/double-stars/sarah-gebauer/sketches/STF%20301.jpg
STF311, pi Ari, 42 Ari AB 5m.3 8m.0 3.2" 118° 2018 Ari 02h49m17.55s / +17°27'51.50"
Robert Zebahl
Leipzig (Germany)
70mm (133x) The companion is visible as elongated, non-condensed brightening in the first diffraction ring of the primary component.
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr schwierig bei 88x, eindeutig bei 144x ../projects/double-stars/uwe-pilz/sketches/191230_PiAri.jpg
A2906 & STF314 A2906 AB 7m.3 8m.8 0.3" 115° 2018 Per 02h52m52.03s / +52°59'50.60"
STF314 AB-C 7m.0 7m.3 1.6" 316° 2018

../images/binary-star-orbits/A2906-AB-orbit.jpg ../images/binary-star-orbits/STF314-AB-C-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (129x) STF314 (AB-C): Beautifully separated, quite close together. Difference in brightness visible, but rather small. Easy to find and bright. Very nice.
Frederik Wanink
Itterbeck (Germany)
254mm (460x) STF314 (AB-C): ähnlich hell ../projects/double-stars/frederik-wanink/sketches/STF314.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) A2906 (AB): This is the brighter of the STF 314 pair. I have a feeling it is slightly elongated but nothing certain.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF314 (AB-C): near equal brightness, AB more yellow yellow-white of the two, ~2 disk separation
STF333, eps Ari AB 5m.2 5m.6 1.4" 210° 2020 Ari 02h59m12.73s / +21°20'25.60"

../images/binary-star-orbits/STF333-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220213EpsAri.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Eps Ari: Beautiful split of white stars, less than 1 delta mag, a little more than 1". Very nice pair. Physical with a 1215 year period
STF341 AB 7m.6 10m.0 8.7" 221° 2016 Eri 03h03m01.79s / -02°05'11.20"
Uwe Pilz
Leipzig (Germany)
105mm (144x) B nur indirekt sichtbar ../projects/double-stars/uwe-pilz/sketches/220117stf341.jpg
HU544 6m.7 8m.2 1.7" 103° 2018 Per 03h15m48.70s / +50°57'21.20"

../images/binary-star-orbits/HU544-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) Clearly seen as figure '8' with noticeable difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (196x) klebt am ersten Ring ../projects/double-stars/uwe-pilz/sketches/Hu544.jpg
Uwe Pilz
Leipzig (Germany)
105mm (260x) im ersten Ring
Robert Zebahl
Leipzig (Germany)
152mm (129x) Wonderfully separated in equally beautiful star surroundings! Clear difference in brightness visible. To the east there is a brighter star, which shines yellowish-orange. HU544 itself seems rather cool in color. ../projects/double-stars/robert-zebahl/sketches/2019-11-23_hu544.jpg
STFA7 AB 7m.4 7m.8 44.1" 234° 2017 Tau 03h31m03.47s / +27°43'53.60"
Christopher Hay
Seeheim (Germany)
71mm (13x) Well separated. Northern component seems slightly brighter.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Nice finder split, equal mag but faint, ~8th mag.
Uwe Pilz
Leipzig (Germany)
105mm (21x) gleichhell, einfach ../projects/double-stars/uwe-pilz/sketches/stfa7.jpg
Robert Zebahl
Leipzig (Germany)
120mm (18x) Well split with noticeable difference in brightness. Nice view together with the double star STF401 located southeast.
★★ STF401 AB 6m.6 6m.9 11.4" 269° 2020 Tau 03h31m20.76s / +27°34'18.50"
Christopher Hay
Seeheim (Germany)
18x80 Cleanly split. Supplemented nicely by the wide pair STFA7 directly north, in very star-poor surroundings in 4° FOV.
Christopher Hay
Seeheim (Germany)
71mm (13x) Just separated.
Uwe Pilz
Leipzig (Germany)
105mm (21x) ein Hauch schwärze dazwischen ../projects/double-stars/uwe-pilz/sketches/stf401.jpg
Robert Zebahl
Leipzig (Germany)
120mm (18x) Barely split at 18x. At 40x difference in brightness is visible. Nice view together with the double star STFA7 located northwest.
Christopher Hay
Seeheim (Germany)
180mm (113x) Very wide separation. Southern component slightly towards orange compared to the northern one, which is slightly towards blue. Very attractive in 0.6° FOV with STFA7.
A physical pair at 318 light years distance from us.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Slight magnitude difference, brilliant white stars, with another slightly fainter and much wider pair in the field (this is SHY 445 BC). Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal white ~7", nice, W-E. Forms a double-double in wider FOV with STF 375.
STF434 AB 7m.8 8m.3 33.7" 83° 2019 Per 03h43m58.92s / +38°22'25.60"
AC 7m.8 13m.6 91.9" 350° 2015
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2020-11-07: Beautiful sight! Nice separation and color contrast: vivid orange & subtle blue.
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: 2020-11-08: Easy to separate, beautiful sight! Light orange & light blue. ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf434.jpg
STF437 AB 9m.8 10m.0 11.2" 310° 2015 Per 03h44m09.15s / +32°07'09.30"
Uwe Pilz
Leipzig (Germany)
105mm (88x) einfach
Uwe Pilz
Leipzig (Germany)
120mm (180x) ../projects/double-stars/uwe-pilz/sketches/211222stf43.jpg
★★ BU535, omicron Per, 38 Per, Atik 3m.9 6m.7 1.1" 20° 2015 Per 03h44m19.13s / +32°17'17.70"
Uwe Pilz
Leipzig (Germany)
105mm (88x) =omikron Per, in IC348, lohnend! ../projects/double-stars/uwe-pilz/sketches/ic348.jpg
Mark McCarthy
Fremont (California/USA)
152mm (285x) Strong sense of out of roundness at all powers, but not certain. Burnham discovered with the 18.5-inch at 1.0". WDS uncertain, and I don't find Gaia data for the secondary
Robert Zebahl
Leipzig (Germany)
152mm (300x) In steady moments the faint companion is clearly recognizable as a small brightening in the first diffraction ring of the primary component.
Mark McCarthy
Fremont (California/USA)
317mm (270x) No split at 270x
★★★ STF470, 32 Eri AB 4m.8 5m.9 6.9" 349° 2019 Eri 03h54m17.49s / -02°57'17.00"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x split, but still tight with noticeable difference in brightness. A slight difference in colors could be seen. At 56x the color difference was very evident: The brighter component appeared slightly yellowish, the fainter one slightly bluish. Highly recommended! The sketch was done few days later during another observation. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_32_eri.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) ab 26x trennbar ../projects/double-stars/uwe-pilz/sketches/220117_32Eri.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Farbkontrast, gelborange-blauweiß ../projects/double-stars/uwe-pilz/sketches/32Eri.jpg
STF471, epsilon Per, 45 Per AB 2m.9 8m.9 8.8" 12° 2020 Per 03h57m51.22s / +40°00'36.90"
Robert Zebahl
Leipzig (Germany)
63mm (46x) Easy to separate, but much fainter, second component, which appears as a small, faint spot. Nice view.
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/211225epsPer.jpg
Mark McCarthy
Fremont (California/USA)
203mm (121x) Very bright white A, and B is far enough away and just the right blue-green color to look like a planet
omicron 2 Eri, 40 Eri, STF518 A-BC 4m.4 9m.3 82.7" 102° 2019 Eri 04h15m16.32s / -07°39'10.30"
BC 9m.5 11m.2 8.2" 330° 2019

../images/binary-star-orbits/STF518-BC-orbit.jpg

Winfried Kräling
Marburg (Germany)
102mm (178x) ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1715UT-40%20Eridani-2.jpg ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1715UT-40%20Eridani-1.jpg
Uwe Pilz
Leipzig (Germany)
105mm (244x) A ist gelblich. B fiel sofort ins Auge, auch bei 144x. C war extrem schwierig. A musste außerhalb des Gesichtsfeldes stehen, aber auch dann war er nur indirekt sichtbar. Dann aber überraschte der verhältnismäßig große Abstand B-C. ~ A ist ein Hauptreihenstern ähnlich der Sonne. B ist ein weißer Zwerg, einer der hellsten am Himmel. C ist ein Roter Zwerg, davon gibt es nicht viele in der Reichweite kleiner Instrumente. Insgesamt hat man drei Zwergsterne auf einen Blick: Einen gewöhnlichen (=Hauptreihen-) Zwerg, einen weißen und einen roten. ../projects/double-stars/uwe-pilz/sketches/200120_40Eri.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm A-BC: Triplesystem with a white Dwarf ../projects/double-stars/berthold-fuchs/photographs/Keid.png
STF519 & GUI5 STF519 AB 7m.8 9m.4 17.9" 348° 2015 Per 04h20m53.71s / +50°22'39.00"
GUI5 AC 7m.8 10m.8 108.8" 193° 2015
Robert Zebahl
Leipzig (Germany)
16x70 STF519 (AB): 2020-11-07: Beautifully framed by brighter stars! Primary component A appears slightly orange with a much fainter, very close companion. To the south is S445, which forms a prominent triangle of stars of different brightness. The brightest of these three stars also appears orange.
Robert Zebahl
Leipzig (Germany)
102mm (28x) STF519 (AB): 2020-11-08: Well separated with large difference in brightness. Primary component appeared white-yellowish. South very outstanding is the double star S445. Worthwhile due to the beautiful surroundings. ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf519_s445.jpg
S445 & ES2604 S445 AB 7m.3 8m.2 71.0" 328° 2017 Per 04h20m57.50s / +50°15'17.40"
S445 AC 7m.3 9m.3 150.3" 263° 2016
ES2604 AD 7m.3 14m.8 24.8" 321° 2015
ES2604 BE 8m.2 11m.2 23.3" 263° 2015
Robert Zebahl
Leipzig (Germany)
16x70 2020-11-07: Together with the uneven double star STF519 in one field of view. The three widely separated, differently bright components A, B and C form a prominent triangle, with A appearing orange. Very beautiful!
Robert Zebahl
Leipzig (Germany)
102mm (28x) 2020-11-08: Components A, B & C visible as a prominent triangle of different brightness. Component A appears slightly yellowish. Together with the northern located double star STF519 in one field of view. Very nice! ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf519_s445.jpg
STF546 7m.9 9m.2 7.0" 182° 2021 Tau 04h27m00.62s / +19°07'03.60"
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/200115stf546.jpg
STF545 AB 6m.9 8m.8 19.0" 58° 2020 Tau 04h27m04.85s / +18°12'27.10"
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter schwach, erfordert sehr hohe Vergrößerung. Hauptstern weiß ../projects/double-stars/uwe-pilz/sketches/200115stf545.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Blush white, ~2 delta mag, PA to NE, wide separation.
★★ STF559 7m.0 7m.0 3.1" 275° 2021 Tau 04h33m33.04s / +18°01'00.20"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Barely split with similarly bright components.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Very nice view! Easy to separate, similarly bright at a nice distance from each other. The colors of the components changed over time: orange and subtle blue.
Uwe Pilz
Leipzig (Germany)
105mm (144x) trennbar mit 88x, westlicher Stern scheint etwas heller und gelb-orange, östlicher Stern orange ../projects/double-stars/uwe-pilz/sketches/200115stf559.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) Beautiful sight, similar bright components, pretty tight.
SHJ45, 88 Tau AB 4m.3 7m.8 69.2" 300° 2017 Tau 04h35m39.23s / +10°09'39.30"
Sarah Gebauer
Germany
150mm (30x) mit freiem Auge als ein Stern erkannt, bei 30x sauber getrennt mit sichtbarem Helligkeitsunterschied ../projects/double-stars/sarah-gebauer/sketches/20191230%2088%20Tau%20DSk.jpg
S455, tau Tau, 94 Tau AB 4m.2 7m.0 62.5" 214° 2017 Tau 04h42m14.70s / +22°57'25.10"
Sarah Gebauer
Germany
150mm (26x) schon bei 26x deutlich getrennt
Sarah Gebauer
Germany
150mm (30x) mit freiem Auge als ein Stern gesehen, bei 30x weit getrennt, eine Komponente ist deutlich heller als die andere ../projects/double-stars/sarah-gebauer/sketches/20191230%20Tau%20Tau%20DSk.jpg
STT560, pi 3 Ori AB 3m.2 11m.3 73.2" 171° 2016 Ori 04h49m50.41s / +06°57'40.60"
Uwe Pilz
Leipzig (Germany)
105mm (144x) wahrscheinlich ein optischer Doppelstern ../projects/double-stars/uwe-pilz/sketches/210222Pi3Ori.jpg
★★ STF616, omega Aur, 4 Aur AB 5m.0 8m.2 4.7" 2019 Aur 04h59m15.41s / +37°53'24.90"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Easy, still relatively tight with a large difference in brightness. Component A appeared pretty bright and white-yellowish, while B appeared only as a tiny star. Very nice sight.
Uwe Pilz
Leipzig (Germany)
105mm (88x) blau und weiß ../projects/double-stars/uwe-pilz/sketches/200111_omegaAur.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb. Schöner Helligkeitskontrast, dabei aber einfach. Auch bei 88x trennbar ../projects/double-stars/uwe-pilz/sketches/191216_4Aur.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Most beautiful light blue A and light orange B, wide around 5", 3 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (113x) Omega Aurigae. The A was a surprising sickly blue-green color, and the B was a tawny brown, nicely split 5" away.
STF623 AB 7m.0 8m.7 20.5" 207° 2018 Tau 04h59m53.75s / +27°19'32.20"
Uwe Pilz
Leipzig (Germany)
105mm (88x) erkennbar bei 21x ../projects/double-stars/uwe-pilz/sketches/200215_Struve623.jpg
STT92, 5 Aur AB 6m.0 9m.5 4.1" 285° 2017 Aur 05h00m18.35s / +39°23'40.90"

../images/binary-star-orbits/STT92-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (160x) schwierig ../projects/double-stars/uwe-pilz/sketches/5Aur.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Nur bei sehr hoher Vergrößerung überhaupt zu trennen, schwierig ../projects/double-stars/uwe-pilz/sketches/200115stt92.jpg
STF627 AB 6m.6 7m.0 21.2" 260° 2020 Ori 05h00m33.93s / +03°36'56.80"
René Merting
Drachhausen (Germany)
18x70 zwei klar sichtbare bequem getrennte Sterne - Komponente B im SW wirkt leicht gelblicher als A - maximal 1/4 Größenklasse Helligkeitsunterschied - ein schöner nicht zu eng und nicht zu weit getrennter Fernglas-Doppelstern
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein bequem getrenntes Pärchen zweier annähernd gleich heller Sterne - Komponente B im Westen ist vielleicht eine viertel Magnitude schwächer - das Sternpaar fällt auf in der Umgebung, weil es kaum hellere Sterne im Umfeld gibt - zurück auf 20x ist es ein schickes eng stehendes Paar, aber nicht zu eng
Uwe Pilz
Leipzig (Germany)
105mm (16x) erkennbar schon bei Fernglasvergrößerung ../projects/double-stars/uwe-pilz/sketches/210222STF627.jpg
STF630 A-BC 6m.5 7m.7 14.4" 49° 2020 Ori 05h02m00.03s / +01°36'31.90"
René Merting
Drachhausen (Germany)
18x70 schick, ein auffälliges knapp getrenntes Pärchen - Komponente B im NO ist keine ganze Größenklasse schwächer (lt. Stelle Doppie aber doch 1.21 mag)
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein knapp getrenntes Pärchen - Komponente BC im NO scheint eine knappe Größenklasse schwächer, er wirkt ein wenig bunter, matter - zurück auf 20x wirkt das Pärchen schicker, weil die beiden Komponenten dann noch enger stehen - der Helligkeitsunterschied ist nicht mehr ganz so ausgeprägt
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb-orange und fahlviolett ../projects/double-stars/uwe-pilz/sketches/210222STF630.jpg
STF645 & BU1047 STF645 A-BC 6m.0 9m.1 11.3" 29° 2017 Tau 05h09m45.06s / +28°01'50.20"
BU1047 BC 9m.1 9m.7 0.3" 88° 2013

../images/binary-star-orbits/BU1047-BC-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) STF645 (A-BC) ../projects/double-stars/uwe-pilz/sketches/200215_Struve645.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) STF645 (A-BC): White and grey, 2 delta mag, wide. BC is BU 1047 0.3" near equal, but not seen
Mark McCarthy
Fremont (California/USA)
508mm (667x) BU1047 (BC): Component of STF 645. Awesome flex on Struve. Near equal BC stars suspected at 533x, hairline split at 667x. A really fine little blue pair near bright white A. Physical with a 32.1-year period, it is at apastron now and will get impossibly close in the 2030s, becoming visually detectible again in the later part of that decade. Burnham discovered in 1889 with the Lick 36-inch, and recorded 0.4" separation
★★ STF644 AB 7m.0 6m.8 1.6" 221° 2019 Aur 05h10m18.81s / +37°18'06.70"
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 57x slightly elongated with a partially visible notching. At 100x & 133x two clearly overlapping diffraction disks are visible as figure '8' with a small difference in brightness.
Robert Zebahl
Leipzig (Germany)
102mm (129x) Grand sight! Two almost touching diffraction disks, slight difference in brightness, both slightly yellowish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) Beide Orange, mit schwarzem Zwischenraum. Lohnend ../projects/double-stars/uwe-pilz/sketches/200115stf644.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Great view, easy to separate, but still quite close together with low difference in brightness. Both components appeared slightly orange.
STF648 AB 8m.1 8m.9 5.0" 64° 2020 Aur 05h10m59.19s / +32°02'19.50"

../images/binary-star-orbits/STF648-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (40x) At 40x tight with obviously fainter component.
Robert Zebahl
Leipzig (Germany)
70mm (33x) Separated, but tight with noticeable difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (144x) beide Komponenten gelb ../projects/double-stars/uwe-pilz/sketches/200111_stf648.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) Light orange, half delta mag, wide.
STF654, rho Ori AB 4m.6 8m.5 6.4" 65° 2018 Ori 05h13m17.48s / +02°51'40.50"
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/210319RhoOri.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Rho Ori Bright light orange-yellow A star with 3 delta mag yellow-white B, ~5"
STT517 AB 6m.8 7m.0 0.7" 244° 2019 Ori 05h13m31.55s / +01°58'03.70"

../images/binary-star-orbits/STT517-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (144x) Es erforderte einige Mühe zu sehen, welches der hellere Stern ist, ../projects/double-stars/uwe-pilz/sketches/210319_os517.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Consistently split but images are bloated by poor seeing, yellowish white stars, <1", near equal
★★★ STF668, 19 Ori, beta Ori, Rigel A-BC 0m.3 6m.8 9.2" 202° 2020 Ori 05h14m32.27s / -08°12'05.90"
Robert Zebahl
Leipzig (Germany)
55mm (83x) The second component was immediately seen as faint companion. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf668.jpg
Robert Zebahl
Leipzig (Germany)
70mm (67x) First attempt at 133x: much fainter component clearly visible as a tiny star at a relatively large distance. After that the visibility was easy even at 67x. At 44x the faint component could only be guessed.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Much fainter companion immediately visible as tiny star far outside the diffraction pattern of the primary component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) zwei Ringe und zahlreiche radiale Strahlen um den Hauptstern ../projects/double-stars/uwe-pilz/sketches/Rigel.jpg
Jörg S. Schlimmer
Germany
127mm (108x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Rigel_Refraktor_2021_03_07_bear_filtered_96dpi.jpg
Jörg S. Schlimmer
Germany
305mm (170x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Rigel%20Newton%202021_02_27%20bear_filtered_96dpi.jpg
STF667 7m.2 8m.8 4.2" 316° 2018 Ori 05h14m41.31s / -07°04'18.10"
René Merting
Drachhausen (Germany)
100mm (107x) bei 64x stehen beide Sterne noch eng aneinander - ein Phänomen, Komponente A im SO ist nicht richtig weiß, die 1.5 mag schwächere Komponente B wirkt dagegen weiß, also trotz großem Helligkeitsunterschied sauberer weiß - erst bei 107x gelingt mir die sichere Trennung, kein Wunder bei dem schlechten Seeing heute
Uwe Pilz
Leipzig (Germany)
105mm (120x) ../projects/double-stars/uwe-pilz/sketches/210319stf667.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange A and 2x fainter B, which is a little blue-orange. 5"
★★ STF653, 14 Aur AB 5m.0 10m.9 8.9" 11° 2017 Aur 05h15m24.39s / +32°41'15.30"
AC 5m.0 7m.3 14.3" 225° 2019
AD 5m.0 10m.8 179.7" 322° 2010
Sarah Gebauer
Germany
100mm (45x) AC: schon bei geringer Vergrößerung erkennt man beim zweiten Hinsehen, dass es sich um ein Sternpärchen handelt; ein schönes Doppelsternbeispiel für die Kategorie "ein heller und ein sehr schwacher nah daneben"
Uwe Pilz
Leipzig (Germany)
105mm (88x) AC: heller Stern gelblich weiß ../projects/double-stars/uwe-pilz/sketches/200111_14Aur.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) AB: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]
Mark McCarthy
Fremont (California/USA)
317mm (270x) AC: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]
STF681 AB 6m.6 9m.2 23.2" 183° 2020 Aur 05h20m39.16s / +46°57'49.60"
René Merting
Drachhausen (Germany)
15x56 Komponente B zeigt sich leicht abgesetzt südlich von A und ist gut 2.5 bis 3 Magnituden schwächer - der Glanz von Kapella stört die Beobachtung enorm
Robert Zebahl
Leipzig (Germany)
16x70 2020-11-07: Together with Capella in one field of view. Beautiful surrounding. Moderate distance and large difference in brightness. Primary component appears white-yellowish with faint companion.
Uwe Pilz
Leipzig (Germany)
105mm (88x) orange ../projects/double-stars/uwe-pilz/sketches/191216stf681.jpg
STF698 AB 6m.7 8m.3 31.4" 348° 2019 Aur 05h25m12.94s / +34°51'18.60"
Robert Zebahl
Leipzig (Germany)
102mm (62x) Beautiful double star, easy to separate and quite striking. Primary component appeared in clear orange, the companion was too faint to identify the color.
Uwe Pilz
Leipzig (Germany)
105mm (88x) rot-orange und blaugrau, lohnend ../projects/double-stars/uwe-pilz/sketches/200111_stf698.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Easy with a attractive separation and a clear difference in brightness. A: pale yellow; B: creamy white with a touch of blue. At 49x the color impression was a bit more intense. Located in beautiful field of stars.
Mark McCarthy
Fremont (California/USA)
317mm (270x) Orange-yellow A and lilac B, wide, finder split, 1 delta mag. Pretty.
STF699 AB 7m.9 8m.6 8.9" 346° 2018 Aur 05h25m38.50s / +38°02'41.10"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Well separated with slightly fainter companion.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Separated at 22x, but still a relatively tight pair with a moderate difference in brightness. Together with sigma Aur in one field of view. Overall rather dim double star. At 57x very nice view! A: pale orange, B: slightly bluish
Uwe Pilz
Leipzig (Germany)
105mm (88x) schwach, aber lohnend. Orange und blau ../projects/double-stars/uwe-pilz/sketches/191216stf699.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) Wide yellow and blue-white, half delta mag.
★★ STF719 AB 7m.5 8m.8 1.4" 336° 2016 Aur 05h30m06.14s / +29°32'55.30"
AC 7m.5 9m.4 15.0" 353° 2020
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: At 22x clearly visible difference in brightness at moderate separation. The companion appears only as a dim star. At 57x the color contrast is also quite noticeable. A: light orange, C: silvery blue
Robert Zebahl
Leipzig (Germany)
102mm (62x) AC: Easy with a rather dim companion. The color seemed a bit more intense than in the 6-inch refractor. A: lovely pale orange; B: grey-bluish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) AC: der helle Stern ist weiß. ../projects/double-stars/uwe-pilz/sketches/200111_stf719.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB waren schwieriger, als es die Daten vermuten ließen. C ist schwach und erforderte indirektes Sehen ../projects/double-stars/uwe-pilz/sketches/200117stf719.jpg
Robert Zebahl
Leipzig (Germany)
152mm (49x) AC: Easy to separate with a significant difference in brightness. A appeared in bright orange, B appeared greyish-blue.
Robert Zebahl
Leipzig (Germany)
152mm (129x) AB: At 129x clearly elongated. Difference in brightness visible. The seeing was mediocre (3/5), so that the diffraction disks were only occasionally visible. At 180x no better.
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: widely separated with an orange A and bluish B
STF728, 32 Ori 4m.4 5m.8 1.3" 44° 2017 Ori 05h30m47.06s / +05°56'53.30"

../images/binary-star-orbits/STF728-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) sauber getrennt, Beugungsscheiben berühren sich gerade ../projects/double-stars/uwe-pilz/sketches/32Ori.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) 32 Ori White and off white pair, 1.5 delta mag, ~1.5". Nice and very clean with seeing
delta Ori, Mintaka BU558 AB 2m.4 14m.2 33.4" 229° 2016 Ori 05h32m00.40s / -00°17'56.70"
STFA14 AC 2m.4 6m.8 56.2" 2017
René Merting
Drachhausen (Germany)
10x50 AC: Komponente C zeigt sich gut abgesetzt im NW von A - Helligkeitsunterschied enorm, mindestens 3 Größenklassen
René Merting
Drachhausen (Germany)
18x70 AC: total leicht - Komponente C thront gut getrennt nördlich über A (Mintaka) und ist gut 2 bis 3 Größenklassen schwächer (sogar 4.42 mag laut Stelle Doppie) und trotzdem noch ein mittelheller Stern - A ist gleißend weiß, C weißgrau
Christopher Hay
Seeheim (Germany)
76mm (25x) AC: C set off well from A. A pure white, C steel blue. Although in the middle of Orion the pair dominates the 3.1° FOV.
Uwe Pilz
Leipzig (Germany)
105mm (22x) AC: blau und violett ../projects/double-stars/uwe-pilz/sketches/210222Mintaka.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) AC: sehr weit in reichem Sternfeld ../projects/double-stars/uwe-pilz/sketches/Mintaka.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AC: reinweiß-violett
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Bright, 2 delta mag, very wide.
★★★ theta 1 Ori, Trapezium, 41 Ori AB 6m.5 7m.5 8.9" 32° 2019 Ori 05h35m15.82s / -05°23'14.30"
AC 6m.5 5m.1 12.9" 133° 2019
BD 7m.5 6m.4 19.4" 121° 2019
CD 5m.1 6m.4 13.4" 62° 2019
AE 6m.5 11m.1 4.6" 352° 2013
CF 5m.1 11m.5 4.7" 120° 2013
Robert Zebahl
Leipzig (Germany)
16x70 2021-02-24: Components A, C & D are clearly separable from each other. The fainter B component is almost completely outshone by A. The pair AB appears clearly elongated and is with concentrated observation in a few moments even visible separated.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2021-02-24: The different bright components A-D are clearly visible separated from each other.
Christopher Hay
Seeheim (Germany)
71mm (32x) 13x: CD definitely split, A uncertain, B not present.
18x: A, C and D definite, B uncertain.
32x: A, B, C and D present and clear.
Mediocre seeing but good transparency with strong M42 and an inkling of M43 at 32x. B is an eclipsing variable with a period of 6.5 days and an amplitude of 0.6mag, presumably obervation was at minimum, which would explain the difficulty in seeing it at lowest powers. C is the main source of excitation of the great Orion Nebula M42/43.
Winfried Kräling
Marburg (Germany)
102mm (178x) ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1810UT-Theta%20Ori-2.jpg ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1810UT-Theta%20Ori-1.jpg
Jörg S. Schlimmer
Germany
127mm (108x) A-E split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Trapez%20Refraktor%202021_02_28%20bear_filtered_96dpi.jpg
Jörg S. Schlimmer
Germany
305mm (170x) A-F split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Trapez%20Newton%202021_03_02%20bear_filtered_96dpi.jpg
★★ STF757 & STF758 & S493 STF757 AB 8m.0 8m.3 1.5" 242° 2018 Ori 05h38m06.52s / -00°11'03.50"
STF758 AC 8m.0 8m.7 51.4" 88° 2015
STF758 AD 8m.0 8m.5 41.7" 80° 2015
S493 AE 8m.0 8m.7 138.3" 263° 2015
STF758 CD 8m.7 8m.5 11.4" 298° 2015
Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220222stf758.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF757 (AB): Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF757 (AB): Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF757 (AB): Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
★★ STF761 AB 7m.9 8m.4 68.1" 202° 2016 Ori 05h38m36.54s / -02°33'12.70"
AC 7m.9 8m.6 72.1" 209° 2016
AD 7m.9 11m.8 32.7" 308° 2016
BC 8m.4 8m.6 8.5" 269° 2015
Christopher Hay
Seeheim (Germany)
30x80 B-C fine split, C appears slightly weaker than B. Component A is too far away at this power from BC to feel that it belongs. Very attractive ensemble overall in the same field of view with Sigma Ori, which also presents three of its components.
René Merting
Drachhausen (Germany)
100mm (32x) A-BC: bei 32x stehen südlich von Komponente A in ordentlichem Abstand die Komponenten B (und C)
BC: bei 32x sehe ich zwei dicht zusammen stehende gleich schwache Sterne, knapp getrennt
Uwe Pilz
Leipzig (Germany)
320mm (80x) B und C sind deutlich orange. In der Zeichnung ist STF 961 fälschlicherweise mit STF 791 bezeichnet. Im selben Feld wie Sigma Orionis ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
26 Aur, STF753 AB-C 5m.5 8m.4 12.4" 269° 2019 Aur 05h38m38.10s / +30°29'32.80"
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Very stretched figure-8, does not actually resolve. Essential to focus the binoculars on some other star.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Separable at 22x, but quite close together and pretty uneven. Primary component appeared in bright orange. At 57x easy to separate. The faint companion appeared silvery-blue.
Christopher Hay
Seeheim (Germany)
76mm (40x) C clearly set off from AB. AB is yellow, no particular colour seen on C.
AB (also known as BU 1240) is a physical double at 566 light years distance to us. So is AB-C according to Stelledoppie, making this a physical triple system.
Uwe Pilz
Leipzig (Germany)
105mm (88x) heller Stern blauweiß ../projects/double-stars/uwe-pilz/sketches/200215_26Aur.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Wide split. Yellow-blue collour contrast of AB to C. Neither of the two colours very strong on its own, but in fine contrast to the other. Reminiscent of the way Polaris appears in a 3-inch at 40x, with less delta-mag, making it easier, but lacking Polaris' dramatic blue of the companion.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright yellow AB and a fainter yellow white C.
★★★ sigma Ori, 48 Ori BU1032 AB 4m.1 5m.3 0.3" 70° 2018 Ori 05h38m44.77s / -02°36'00.20"
STF762 AB-C 3m.8 8m.8 11.4" 239° 2019
STF762 AB-D 3m.8 6m.6 12.9" 84° 2019
STF762 AB-E 3m.8 6m.3 41.4" 62° 2019
STF762 DC 6m.6 8m.8 23.8" 252° 2019
STF762 EC 6m.3 8m.8 52.9" 242° 2019
STF762 ED 6m.3 6m.6 29.8" 233° 2019
STF3135 AB-F 3m.8 7m.9 208.0" 324° 2016
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld.
AB-D: No split, nor any elongation of AB towards D seen.
AB-E: E is set off well from AB but harder to split than the numbers would suggest. This is partly due to the major delta-mag, and partly to the circumstance that D effectively reduces the "free" stretch of sky to 29".
STF761 is a nice complement a few minutes of arc to the west and makes the visual impression of possibly belonging to the Sigma Ori complex, but Stelledoppie doesn't confirm this.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld.
AB-D: No split acheived. However, focussing on AB feels uncertain, presumably due to disturbance by D. Also not split with 15x60 on tripod.
AB-E: E is set off well from AB.
Christopher Hay
Seeheim (Germany)
25x80 AB-D: D is set off nicely from AB and appears very slightly on the orange side, particularly in contrast to E.
René Merting
Drachhausen (Germany)
100mm (64x) AB-C: bei 64x zeigt sich Komponente C ganz schwach südwestlich von AB
AB-D: bei 32x schließt sich an die zartgelbe Komponente AB unmittelbar im Osten dicht stehend D weißorange an - ein schickes Trio zusammen mit E weiter östlich
AB-E: bei 32x zeigt sich in vierfacher Entfernung von AB-D die Komponente E weiter östlich in einer Linie - E ist ähnlich hell wie D
Sarah Gebauer
Germany
150mm (125x) ein sehr schönes Muster des Mehrfachsystems, auch wenn längst nicht alle Komponenten getrennt zu sehen waren, AB-C, AB-D und AB-E getrennt, A und B nicht ../projects/double-stars/sarah-gebauer/sketches/20200409%20Sigma%20Ori%20DSk.jpg
Uwe Pilz
Leipzig (Germany)
320mm (80x) AB-C-D schon im Aufsuchokular sichtbar. Sehr lebhafte Farben, einer der schönsten Mehrfachsterne überhaupt. Im selben Feld mit STF761 ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
STF774, zeta Ori, 50 Ori, Alnitak AB 1m.9 3m.7 2.4" 167° 2017 Ori 05h40m45.52s / -01°56'33.30"
AC 1m.9 9m.6 58.5" 10° 2017

../images/binary-star-orbits/STF774-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (128x) AB: Big difference in brightness. I could see the fainter component near the first ring of the Airy pattern of the brighter component.
Winfried Kräling
Marburg (Germany)
102mm (178x) AB ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1740UT-Zeta%20Ori-2.jpg ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1740UT-Zeta%20Ori-1.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: sauber getrennt, Beugungsscheiben berühren sich gerade ../projects/double-stars/uwe-pilz/sketches/Alnitak.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Alnitak. Easy, 2 delta mag,~2", white
Mark McCarthy
Fremont (California/USA)
317mm (207x) AC: Alnitak:AC is a very faint star widely separated outside of the main star's glare.
Mark McCarthy
Fremont (California/USA)
317mm (207x) AB: about 2" and 1.5 delta mag.
★★ STF764 6m.4 7m.1 25.8" 15° 2019 Aur 05h41m20.98s / +29°29'14.70"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. PA very clear and the pair splits apart in good moments. Keeping Alnath (Beta Tau) out of the FOV helps. Chi Aur is in a nice little arc of stars on north-western edge of FOV, enhances the aesthetics of the field of view.
Robert Zebahl
Leipzig (Germany)
8x44 2020-11-25: Cleanly split, rather close together. In beautiful star field together with beta Tauri.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Distinctly split, attractive sight in light orange and light blue, a visually strong pair. 26 Aur (STF753, not quite split) in same 3.3° field of view.
Christopher Hay
Seeheim (Germany)
25x80 Well split. Brighter star honey-yellow, companion ice-blue. Very similar brightnesses. A visually strong, compact pair at this power in 3.2° field of view.
Robert Zebahl
Leipzig (Germany)
55mm (25x) Easy to split with large distance and noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Very easy and bright, pretty wide apart with a small difference in brightness; whitish and slightly yellowish.
Christopher Hay
Seeheim (Germany)
76mm (40x) Well separated, even brightness of components. A appears immediately orangish, B bluish, but after a minute of observation this impression fades to colourlessness.
Uwe Pilz
Leipzig (Germany)
105mm (88x) blauweiß und orange, kleiner aber gut sichtbarer Helligkeitsunterschied. Schon bei 21x sichtbar, sehr lohnend. ../projects/double-stars/uwe-pilz/sketches/200117stf764.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Wide apart but a strong pair with slight delta-mag. Mild orange-to-blue colour contrast of A to B that remains stable in contrast to 76mm observation in same night.
Mark McCarthy
Fremont (California/USA)
317mm (277x) two bright whites widely separated
STF783 8m.1 9m.7 8.3" 2015 Aur 05h44m37.74s / +29°00'59.70"
Uwe Pilz
Leipzig (Germany)
105mm (288x) schwierig, weil schwach. Heller Stern gelblich ../projects/double-stars/uwe-pilz/sketches/200117stf783.jpg
STF3115 6m.5 7m.5 0.9" 337° 2017 Cam 05h49m04.64s / +62°48'29.60"

../images/binary-star-orbits/STF3115-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) gerade eben trennbar mit schwarzem Zwischenraum ../projects/double-stars/frederik-wanink/sketches/STF3115.jpg
STF791 AB 9m.1 10m.0 5.0" 91° 2019 Aur 05h50m03.41s / +39°34'34.70"
AC 9m.1 11m.2 60.7" 214° 2015
Uwe Pilz
Leipzig (Germany)
16x70 ../projects/double-stars/uwe-pilz/sketches/200918stf79.jpg
STF805 8m.4 8m.9 12.1" 50° 2015 Tau 05h51m48.20s / +28°26'59.60"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schwaches Paar - Komponente B zeigt sich knapp abgesetzt im NO von A und ist eine halbe Größenklasse schwächer - unauffällig trotz scheinbarer Sternarmut im Umfeld
Uwe Pilz
Leipzig (Germany)
105mm (88x) schwach, aber lohnend, gelb und blaugrau ../projects/double-stars/uwe-pilz/sketches/200117stf805.jpg
STT545, 37 Aur, theta Aur AB 2m.6 7m.2 4.2" 304° 2019 Aur 05h59m43.24s / +37°12'45.90"

../images/binary-star-orbits/STT545-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) At 57x nothing seen at first sight. At 133x the much fainter component was visible after a short time as a tiny star in the correct position angle. With this knowledge, the observation at 57x was also successful, even if one has to look very closely. The challenge here is not so much the angular distance as the large difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (200x) blauweiß. Wegen der etwas unruhigen Luft und des Helligkeitsunterschiedes nicht einfach. ../projects/double-stars/uwe-pilz/sketches/191216theAur.jpg
Mark McCarthy
Fremont (California/USA)
178mm (222x) Brilliant white A and light orange B, which is very much fainter and on the outside of A's third diffraction ring. A is causing a lot of diffraction in average to poor seeing. Physical with a 473 year period, it is now near apastron and will hang there for the rest of my lifetime
BU16, 3 Mon 5m.0 8m.0 2.0" 354° 2016 Mon 06h01m50.42s / -10°35'52.60"
Uwe Pilz
Leipzig (Germany)
105mm (260x) schwache Aufhellung im ersten Ring ../projects/double-stars/uwe-pilz/sketches/3Mon.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter schwach ../projects/double-stars/uwe-pilz/sketches/bu16.jpg
BU17 AB 6m.9 9m.3 3.6" 192° 2019 Mon 06h08m25.39s / -11°08'46.60"
AC 6m.9 10m.8 10.2" 260° 2015
BC 9m.3 10m.8 9.3" 276° 1998
Uwe Pilz
Leipzig (Germany)
105mm (288x) Dreifachstern! (Burnham 17) ../projects/double-stars/uwe-pilz/sketches/bu17.jpg
STT134 & WAL42 STT134 AB 7m.5 9m.1 31.2" 189° 2016 Gem 06h09m15.94s / +24°25'40.30"
WAL42 AD 7m.5 12m.6 43.8" 251° 2015

Located in the northern part of Messier 35.

René Merting
Drachhausen (Germany)
100mm (32x) STT134 (AB): bei 32x zeigt sich südlich von A ein gut 1.5 Magnituden schwächerer Begleiter - ein ordentlich getrenntes Pärchen - im Umfeld nicht sehr auffällig (logisch bei einem Doppelstern in M 35)
Uwe Pilz
Leipzig (Germany)
120mm (360x) STT134 (AB): in M35 ../projects/double-stars/uwe-pilz/sketches/220227stt134-2.jpg
Robert Zebahl
Leipzig (Germany)
152mm (92x) 2022-02-27: At 30x the uneven pair AB appears widely separated. A shines in a glaring bright orange, B in the south appears slightly bluish. Then at 92x component D is also very faintly visible. All three components form an acute-angled, nearly isosceles triangle. Also at this magnification A appears bright orange, B gray-bluish. At 171x D still remains pretty faint.
BU1008, eta Gem, 7 Gem, Propus 3m.5 6m.2 1.8" 258° 2020 Gem 06h14m52.69s / +22°30'24.60"

../images/binary-star-orbits/BU1008-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) Aufhellung im ersten Ring
Uwe Pilz
Leipzig (Germany)
105mm (288x) sehr schwierig ../projects/double-stars/uwe-pilz/sketches/etaGem.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) Already comparatively easy at 180x. The faint companion can be seen well as a quite distinct, slightly elongated, partly round brightening. At 225x and above it becomes easy and immediately apparent, even if the diffraction rings of the primary component are not permanently visible due to the seeing. The primary component was shining in a bright orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Propus. Yellow A and blue-yellow B, 2 delta mag, 1.5" very nice
STF900, epsilon Mon, 8 Mon AB 4m.4 6m.6 12.2" 30° 2019 Mon 06h23m46.10s / +04°35'34.20"
Robert Zebahl
Leipzig (Germany)
55mm (42x) Relatively large distance and clear difference in brightness. The lighter component seemed white-yellowish, the weaker one slightly greenish-blue. The color contrast, however, was not particularly conspicuous.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Blau-rot ../projects/double-stars/uwe-pilz/sketches/epsMon.jpg
SHJ70, 15 Gem AB 6m.7 8m.2 24.7" 203° 2019 Gem 06h27m46.58s / +20°47'22.60"
AC 6m.7 12m.7 85.6" 35° 2015
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2021-02-22: Clearly split with noticeable difference in brightness. Pale orange with much fainter companion. Together with Nu Gem & 16 Gem in a nice curved star chain.
René Merting
Drachhausen (Germany)
18x70 AB: ein schönes enges Sternpaar, Komponente B ist SW ist ordentlich getrennt von A zu erkennen - etwas über eine Größenklasse Helligkeitsunterschied, dadurch leichter Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: Auch bei 21x trennbar ../projects/double-stars/uwe-pilz/sketches/220228_15gem.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Very pretty orange A, with a brown B, ~1.5 delta mag.
★★★ beta Mon, 11 Mon STF919 AB 4m.6 5m.0 7.1" 133° 2019 Mon 06h28m49.07s / -07°01'59.00"
STF919 AC 4m.6 5m.4 9.9" 126° 2019
STF919 BC 5m.0 5m.3 3.0" 109° 2019
BU570 AD 4m.6 12m.1 26.5" 56° 2014
René Merting
Drachhausen (Germany)
18x70 das Mehrfachsystem ist als 8 erkennbar, eine extrem knappe Berührung, wobei die Komponenten B und C im SO nur als ein Stern gesehen werden können - BC ist gleich hell wie A allein
René Merting
Drachhausen (Germany)
100mm (32x) A-BC: bei 32x ein wunderschöner eng stehender Doppelstern - die bei dieser Vergrößerung noch nicht trennbare Komponenten B und C im SO wirken leicht gelblich und ist leicht heller als A - die Komponenten A und BC wollen sich berühren, schaffen es aber nicht ;-)
BC: bei 64x wirkt BC leicht länglich wie ein Stäbchen - bei 107x dann der Aha-Effekt, es sind zwei Sterne, knapp getrennt und mit gleichem Positionswinkel wie A-BC - beide Komponenten B und C sind gleich hell und einzeln jeweils etwa eine halbe Größenklasse schwächer als A im NW
Uwe Pilz
Leipzig (Germany)
105mm (137x) Dreifachsystem, drei fast gleichhelle Sterne. Alle blau-weiß ../projects/double-stars/uwe-pilz/sketches/betaMon.jpg
S524 AB 7m.2 7m.4 53.0" 244° 2017 Gem 06h34m07.10s / +22°07'27.20"
René Merting
Drachhausen (Germany)
18x70 AB: popeleinfach mit dem FG - ein mehr als gut getrenntes Pärchen zweier gleich heller Sterne - die östliche Komponente wirkt ein klein wenig heller - A warmweiß, B blauweiß
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x zeigen sich zwei annähernd gleichhelle Sterne weit getrennt voneinander - Komponente B im SW wirkt kühler als A
AC: bei 32x ist südöstlich von A in doppeltem Abstand wie AB eine weitere Komponente erkennbar - C ist mindestens 2 Größenklassen schwächer als B - alle drei Sterne bilden ein schönes rechtwinkliges Dreieck, wobei die Ecke von A den rechten Winkel bildet - zurück auf 20x ist C auch noch knapp sichtbar
Uwe Pilz
Leipzig (Germany)
105mm (21x) selbst bei 21x einfach zu erkennen ../projects/double-stars/uwe-pilz/sketches/220228_s524.jpg
Robert Zebahl
Leipzig (Germany)
152mm (30x) 2022-02-27: Pretty bright, wide double star with small difference in brightness. Both components appear white.
★★ STT147 AB 6m.8 8m.7 42.7" 74° 2016 Aur 06h34m19.37s / +38°04'33.60"
A-CD 6m.8 9m.8 44.5" 119° 2016
CD 10m.6 11m.0 0.5" 109° 1957
Uwe Pilz
Leipzig (Germany)
105mm (200x) ../projects/double-stars/uwe-pilz/sketches/200123stt147.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) At 22x, the components A, B and CD are immediately conspicuous, where A dominates. They form a beautiful, acute-angled triangle. At 69x, color differences are also visible. A: subtle orange; B: grey-bluish; CD: tendency to orange. Rewarding, because the double stars STF 928 & STF 929 as well as the very conspicuous carbon star UU Aur are in close proximity and can partly be observed together in one field of view!
★★ STF928 AB 7m.9 8m.6 3.4" 131° 2019 Aur 06h34m41.81s / +38°32'24.50"
AC 7m.9 12m.4 130.9" 124° 2002
BC 8m.6 12m.4 127.3" 124° 2015
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB: At 28x the double star already appeared elongated, at 62x beautifully separated, with component A shining in a warm, subtle orange. At 125x A appeared orange, B grey-bluish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB: kühl-weiß und lila ../projects/double-stars/uwe-pilz/sketches/200123stf928.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) AB: Clearly separated, but tight. Moderate difference in brightness. Nice view with the nearby double stars STT147 & STF 929 and the carbon star UU Aur!
Mark McCarthy
Fremont (California/USA)
178mm (148x) AB: Classic Struve, very lightly yellow-white stars, about 1 delta, well separated
STF922 AB 7m.7 10m.8 9.5" 138° 2016 Cam 06h38m18.76s / +64°44'06.00"
AC 7m.7 11m.2 25.5" 2016
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-16: Component A looked slightly yellowish, components B & C appeared rather dim. ../projects/double-stars/robert-zebahl/sketches/2020-04-16_stf922.jpg
STT152, 54 Aur 6m.2 7m.8 0.8" 34° 2016 Aur 06h39m33.12s / +28°15'47.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STT152.jpg
★★ STF946 7m.3 9m.1 4.0" 129° 2019 Lyn 06h44m51.62s / +59°26'57.40"
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy to split with noticeable difference in brightness. Very nice view together with the triple system STF 948 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit 12 Lyn ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 100x and 129x easy to separate, quite uneven. Primary component appeared yellowish, the fainter one rather greyish. Fantastic view together with 12 Lyn (STF 948) in one field of view!
★★★ AGC1, 9 CMa, alpha CMa, Sirius AB -1m.5 8m.4 11.2" 67° 2020 CMa 06h45m08.92s / -16°42'58.00"

../images/binary-star-orbits/AGC1-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) mit ADV, ohne nicht trennbar. Eindeutig
Robert Zebahl
Leipzig (Germany)
120mm (150x) 2021-03-02: Used magnifications from 86x to 200x using a Baader yellow filter. The diffraction disk was relatively good visible, but the diffraction rings were noticeably in movement (Seeing 3/5).
Jörg S. Schlimmer
Germany
127mm (136x) not split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Sirius_Refraktor_2021_03_07_bear_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
203mm (368x) Small disk formed on diffraction spike at correct separation and PA (Feb. 2016)
Mark McCarthy
Fremont (California/USA)
317mm (443x) A faint yellow-orange disk, to the edge of Sirius A's diffraction and just below my spider's diffraction spike. I let Sirius pass beyond the field stop, and for an instant there was Sirius B, clearly separated, before it too passed beyond the field stop.
Jörg S. Schlimmer
Germany
305mm hard to split with CMOS Camera ../projects/double-stars/joerg-schlimmer/photographs/Sirius_20210224_res_best45_bear.jpg
★★★ STF948, 12 Lyn AB 5m.4 6m.0 1.9" 65° 2020 Lyn 06h46m14.15s / +59°26'30.10"
AC 5m.4 7m.0 8.9" 309° 2019

../images/binary-star-orbits/STF948-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: Components A/B and C well separated, but tight. Significant difference in brightness. The fainter C companion appeared slightly orange, the brighter one white-bluish.
Robert Zebahl
Leipzig (Germany)
55mm (167x) AB: Components A and B separated, whereby the Airy disks slightly overlap. The difference in brightness was well visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf948.jpg
Robert Zebahl
Leipzig (Germany)
63mm (140x) AB: Components A and B split with almost no space in between. The difference in brightness was visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf948.jpg
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: Well split, relatively close together with significant difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Both components A + B clearly split, whereby the diffraction rings where merged together. A very nice view together with component C. I sketched this triplet, which reflects my impression well. Unfortunately, the distance and position angle are not particularly well observed. Also the difference in brightness I didn't noticed during my observation. ../projects/double-stars/robert-zebahl/sketches/2019-01-20_stf948.jpg
Robert Zebahl
Leipzig (Germany)
102mm (129x) At 28x the pair AC is nicely separated without any problems. The close pair AB is already recognizable at 86x as a clear figure '8', at 125x wonderfully separated. The components A & B appear yellowish. Very nice view together with STF 946 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit STF 946 ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) At 49x the pair AC is beautifully separated with a significant difference in brightness. At 100x, the close pair AB is also separated, although still very close together. A slight difference in brightness is noticeable. At 129x, the view is magnificent. The two bright components A & B present themselves yellowish, the fainter component C rather greyish. STF 948 can be well observed in a field of view with the neighbouring double star STF 946. Both show a nice overall scenery.
Mark McCarthy
Fremont (California/USA)
178mm (148x) AB: Gorgeous triple star, pale yellow A and B, and 1 delta blue C. really stunning. AB physical with a 733-year period
STF991 AB 8m.0 9m.2 3.8" 165° 2019 Gem 06h57m01.26s / +24°57'27.90"
AC 8m.0 10m.6 134.0" 202° 2017
CD 10m.6 11m.1 13.2" 2017
Sarah Gebauer
Germany
100mm (73x) AB: haarscharf getrennt, nordwestliche Komponente ist etwas heller und größer und die südöstliche steht ganz schwach daneben
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: bei 88x trennbar. Orange, Begleiter schwach ../projects/double-stars/uwe-pilz/sketches/210131stf991.jpg
Robert Zebahl
Leipzig (Germany)
152mm (92x) AB: 2022-02-27: Nice, obvious double star with moderate difference in brightness. The components are still relatively close together, but easily separable. The primary component appears bright orange with a faint companion.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: White and orange, 2 delta mag, ~5", PA to S.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Pretty off-yellow A and a little ruddy red B, nice
STT159, 15 Lyn AB 4m.5 5m.5 0.7" 237° 2020 Lyn 06h57m16.60s / +58°25'23.00"

../images/binary-star-orbits/STT159-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (200x) nicht getrennt im April 2020 ../projects/double-stars/uwe-pilz/sketches/200409_15Lyn.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) relativ einfach ../projects/double-stars/frederik-wanink/sketches/15Lyn.jpg
★★ STTA80 AB 7m.2 7m.4 124.1" 53° 2015 Gem 06h58m06.59s / +14°13'43.40"
AC 7m.2 8m.4 81.2" 112° 2015
Christopher Hay
Seeheim (Germany)
7x45 Handheld. AB are a well separated, matching pair. Immediately striking in field.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are a widely separated pair, and joined by a third, weaker, point of light, which is C, well separated. A charming little triangle.
Involved in (or making up?) Monti 4 asterism.
Robert Zebahl
Leipzig (Germany)
70mm (22x) All 3 components form a striking triangle and are slightly different in color. A (western component): white-bluish; B (northern component): white-yellowish; C (southern component): orange, partly slightly reddish. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stta80.jpg
★★ STF1007 AB 7m.4 11m.4 14.6" 300° 2015 Gem 07h00m37.12s / +12°43'24.20"
AC 7m.4 10m.0 21.9" 244° 2015
AD 7m.4 7m.7 67.7" 28° 2016
Christopher Hay
Seeheim (Germany)
7x45 AD: Handheld. Stands out immediately as double with clear PA in field of several similarly bright single stars. Unsupported, hand tremor prevents actually seeing each component singly, but by bracing arms in reclining chair the well-matched pair is clearly split.
A physical double at a distance to us of 914 light years.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AD well split. A is distinctly brighter and seems bluish. Nice in 4.5° FOV together with STTA80 ABC.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AD: Wide separation, small difference in brightness. Slight difference in color, but difficult to describe. Component A at least seemed rather white. South of STF1007 there is also the double star HJ3288 and the star HD52976, which appears in a bright orange. Together in one field of view a beautiful sight. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
BU573 7m.2 7m.8 0.8" 311° 2018 Mon 07h01m49.89s / -10°52'56.30"

../images/binary-star-orbits/BU573-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/220228_BU573.jpg
Uwe Pilz
Leipzig (Germany)
105mm (247x) schwach gekerbt ../projects/double-stars/uwe-pilz/sketches/bu573.jpg
HJ3288 7m.3 8m.7 38.5" 247° 2015 Gem 07h02m18.43s / +12°34'54.20"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Easy to separate with moderate angular distance and a significant difference in brightness. Slight difference in color: white-yellowish, slightly orange. Nice view together with the double star STF1007 and HD52976, which appears in a bright orange. Sketched together with STF1007. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
★★ STF1001 AB 7m.8 9m.4 9.1" 66° 2019 Lyn 07h03m05.51s / +54°10'26.60"
AC 7m.8 9m.3 9.9" 58° 2019
BC 9m.4 9m.3 1.6" 2019
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-23: At 28x the pair A-BC is easy to separate. At 160x, the very close pair BC shows split. The component A appears slightly orange.
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/200409stf1001.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2020-03-23: At 22x, the wide pair A-BC already appears separated, but still very tight. At 69x, A appears in a subtle orange. The pair BC shows elongated and rather greenish-bluish. At 100x BC is already visible as figure '8' and almost separated, at 129x clearly separated. Components B and C are still very close together and equally bright. The color impression remains. An interesting and rewarding triple system! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1001.jpg
Mark McCarthy
Fremont (California/USA)
178mm (222x) BC: Wow excellent 2+1, with a brighter white A and BC is a near equal faint pair about 1" separation. Seen with 148x but better resolved with 222x
RST3489 7m.4 8m.4 0.6" 299° 1991 Mon 07h04m25.53s / -10°27'15.80"
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/220228_RST3489.jpg
STF1016 7m.4 9m.5 5.4" 150° 2018 Mon 07h04m38.29s / -11°31'26.40"
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/220228_STF1016.jpg
D12 & STF1019 & RST3491, V569 Mon D12 AB 6m.5 10m.1 6.4" 282° 2003 Mon 07h05m49.64s / -10°39'36.30"
STF1019 AC 6m.5 9m.6 38.2" 292° 2011
RST3491 CD 9m.6 10m.4 0.9" 302° 1963
René Merting
Drachhausen (Germany)
12x42 AC: mit etwas Konzentration zeigt sich C extrem schwach nordwestlich von A - Abstand ordentlich
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB ../projects/double-stars/uwe-pilz/sketches/220228_D12.jpg
STF1037 AB 7m.2 7m.3 0.8" 304° 2019 Gem 07h12m49.08s / +27°13'30.20"

../images/binary-star-orbits/STF1037-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) eingekerbt ../projects/double-stars/uwe-pilz/sketches/stf1037.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) bei 200x trennbar, beide gelb ../projects/double-stars/uwe-pilz/sketches/210131stf1037.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Hairline split at 205x but went to 533x to get clear view of it to drift through the field to tell PA. Slight magnitude difference. Really nice looking pair, masked down to 7-inches to get clean disks. Physical with a 118.35-year period, it will close rapidly and become undetectable during the 2030s, widening again in the 2040s
Frederik Wanink
Itterbeck (Germany)
254mm (640x) leichter, gleich hell ../projects/double-stars/frederik-wanink/sketches/STF1037.jpg
STF1033 AB 7m.8 8m.4 1.5" 278° 2017 Lyn 07h14m48.05s / +52°32'44.10"
AC 7m.8 10m.2 79.3" 273° 2017
Robert Zebahl
Leipzig (Germany)
102mm (160x) The pair AB appears clearly separated, but still pretty tight with a well visible difference in brightness. The faint C component is wide apart at a similar position angle. ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1033.jpg
★★ 145 CMa, Winter Albireo HJ3945, Winter Albireo AB 5m.0 5m.8 26.5" 50° 2020 CMa 07h16m36.84s / -23°18'56.10"
SHY508 BC 5m.8 6m.8 999.9" 165° 1999
Christopher Hay
Seeheim (Germany)
7x45 AB: On tripod. Very tight but definitely split. A tends towards orange. Proximity to A prevents determination of colour of B.
René Merting
Drachhausen (Germany)
8x30 AB: Winter-Albireo - ein eng stehendes Pärchen, ganz knapp getrennt - Komponente A im SW knallig orange, bei B ist schwer eine Farbnuance erkennbar, eher weißlich und deutlich schwächer als A
René Merting
Drachhausen (Germany)
10x50 AB: ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
Christopher Hay
Seeheim (Germany)
10x56 BC: On tripod. B is set off well from visually distracting A (which in turn is the primary of HJ3945, the Winter Albireo). C seen clearly and well framed in 6.3° field of view with Tau CMa at centre of field.
Shaya 508 BC is a physical double at a distance to us of 303 light years. Reported in E.J. Shaya, R. Olling, 2011: Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue. The C component is more than 3° to the south of the B component. Coordinates of C component (= HD 35578) are RA 07h20m32.5s, DEC -26°42'01".
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. Immediately striking as well-split pair. A flashing orange. Glare and scintillation of A prevent any definite colour impression of B.
René Merting
Drachhausen (Germany)
18x70 AB: ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
Christopher Hay
Seeheim (Germany)
42mm (12x) AB: Clean split. Orange and blue.
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x leuchtet Komponente A goldgelb, B im NO wirkt weiß ohne den erwarteten Farbstich, auch nicht bei 107x und auch nicht, wenn ich die Sterne leicht unscharf stelle - trotzdem sehenswert - auch bei 20x zeigen sich beide Sterne ordentlich voneinander getrennt, A strahlt jetzt noch tiefgelber, fast orange
Uwe Pilz
Leipzig (Germany)
105mm (37x) AB: sofort auffallend, blau-orange ../projects/double-stars/uwe-pilz/sketches/hj3945.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) AB: Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.
STF1050 AB 8m.1 8m.8 19.4" 21° 2020 Lyn 07h19m51.29s / +54°55'18.40"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Rather faint, obviously split with visible difference in brightness. View similar to STF 1062.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
STF1066, delta Gem, 55 Gem 3m.5 8m.2 5.5" 229° 2018 Gem 07h20m07.39s / +21°58'56.40"

../images/binary-star-orbits/STF1066-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (71x) Large difference in brightness. The fainter component was well separated, but just a very tiny star.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Easy to separate with relatively large distance. The companion appeared as a tiny, faint star.
Winfried Kräling
Marburg (Germany)
102mm (178x) ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1835UT-delta%20Gemini%20-%20Wasat-2.jpg ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1835UT-delta%20Gemini%20-%20Wasat-1.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) Nicht gesehen, wahrscheinlich ist der Begleiter zu schwach für leicht diesigen Himmel
Uwe Pilz
Leipzig (Germany)
105mm (288x) erster Ring in SSW heller, zweiter nur an dieser Stelle sichtbar
Mark McCarthy
Fremont (California/USA)
178mm (205x) Bright light yellow A and much fainter light orange B, wide about 6". Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wasat = Delta Geminorum: Pretty white-yellow and red-orange pair, PA to west, ~4".
STF1062, 19 Lyn AB 5m.8 6m.7 13.8" 317° 2019 Lyn 07h22m52.06s / +55°16'53.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Clearly separated, moderate distance, noticeable difference in brightness. The colors seemed different, but not exactly definable.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
Uwe Pilz
Leipzig (Germany)
105mm (21x) ../projects/double-stars/uwe-pilz/sketches/200409_19Lyn.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Easy to separate, but still quite close together with visible difference in brightness. Color wise unremarkable.
Mark McCarthy
Fremont (California/USA)
178mm (148x) Bright, white, 1 delta mag, wide, parallax indicates physical
STF1081 AB 7m.7 8m.5 1.9" 234° 2019 Gem 07h24m08.94s / +21°27'28.00"
AC 7m.7 9m.9 107.0" 63° 2017
Robert Zebahl
Leipzig (Germany)
102mm (28x) AC: Rather wide apart from component A with noticeable difference in brightness. Less conspicuous.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB: At 86x just separated, very close together with moderate difference in brightness. In relation to A, the components B & C are almost opposite each other. At 125x, A & B are easy to split.
Uwe Pilz
Leipzig (Germany)
120mm (180x) ../projects/double-stars/uwe-pilz/sketches/220319STF1081.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Very pretty blue-white A and slightly orange B, well separated about 2"
STF1083 7m.3 8m.1 6.9" 226° 2019 Gem 07h25m35.30s / +20°29'42.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Unequal pair. At 22x very tight, at 44x well split. Fainter companion appeared slightly orange, brighter one white-bluish.
Uwe Pilz
Leipzig (Germany)
120mm (94x) ../projects/double-stars/uwe-pilz/sketches/220319stf1083.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, wide, 1 delta mag. A nice, typical Struve
STF1094 7m.6 8m.5 2.5" 97° 2019 Gem 07h27m25.99s / +15°18'59.00"
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 57x barely split with noticeable difference in brightness. At 100x well split, but still tight.
Uwe Pilz
Leipzig (Germany)
120mm (200x) ../projects/double-stars/uwe-pilz/sketches/220319stf1094.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) White, 1.5 delta mag, about 2", nice and cleanly split
ES2625 & S548 ES2625 AB 7m.0 12m.4 11.9" 24° 2015 Gem 07h27m40.54s / +22°08'29.30"
S548 AC 7m.0 8m.9 35.3" 277° 2019
Christopher Hay
Seeheim (Germany)
15x45 S548 (AC): Binoculars with internal stabilisation, handheld. Clean split. Secondary very faint. Primary yellowish-orange, a colour impression confirmed (without split) in handheld 7x45. Seen together with Eskimo Nebula (stellar) in 4.5° FOV.
A physical double at a distance to us of 1199 light years.
René Merting
Drachhausen (Germany)
100mm (20x) S548 (AC): bei 32x ein weit getrenntes Paar - Komponente A strahlt schwach gelblich … eher dunkelgelb - Komponente C im Westen von A ist gut 1.5 Magnituden schwächer und dunkelgrau bis lachsorange - der Doppelstern steht isoliert, fällt aber nicht übermäßig auf - zurück auf 20x ist das Paar weiterhin gut getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) S548 (AC): bei 21x trennbar, orange und fahlblau ../projects/double-stars/uwe-pilz/sketches/210131s548.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) S548 (AC): Orange with a 2x fainter white star, PA slightly SW. AB is 12th mag and not seen
★★★ STF1110, alpha Gem, 66 Gem, Castor AB 1m.9 3m.0 5.4" 53° 2020 Gem 07h34m35.86s / +31°53'17.80"
AC 1m.9 9m.8 71.6" 164° 2020
AD 1m.9 10m.1 179.8" 221° 2017

../images/binary-star-orbits/STF1110-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
20x60 AB: Handheld in reclining chair, binoculars with internal stabilisation. 16 April 2022 (5.5" angular distance according to database): Distinctly elongated, like a rectangle at the transition to a figure-8.
Christopher Hay
Seeheim (Germany)
26x42 AB: 13 May 2022 (5.5" angular distance according to database). Moon four-fifths full a few degrees north of Spica in Virgo. 70mm binoculars stopped down to 42mm aperture. Directly after looking the Moon I was able to split Castor AB definitely. Could hold this for a full minute, only then did the split start to become uncertain. Repeated the observation several times, found the split to be definite each time.
Christopher Hay
Seeheim (Germany)
32x70 AB: 13 March 2022 (5.5" angular distance according to database): Moon only 6° away and two-thirds full in the middle of Gemini. After concentrated observation of the Moon I slewed quickly to Castor to exploit the heightened acuity provided by viewing the bright Moon. Castor clearly split with fine black between A and B. After a while the split became more difficult but could still be held.
Followed this up with the same eyepiece previously used in the achromatic 70/400 binoculars now placed in 71/400 fluorite apochromatic telescope, thus again yielding 32x. Again A and B split after observation of the Moon, but harder to hold with the mono apochromat than with the bino achromat.
Christopher Hay
Seeheim (Germany)
36mm (33x) AB: 16 April 2022 (5.5" angular distance according to database): With Käsemann (KSM) polarising filter at 33x two kissing Airy disks which seem to move apart in good moments, but this is uncertain. Without filter at 33x just a squat figure-8 far removed from separation.
With polarising filter at 40x definite separation, fine first diffraction ring of component A. Without filter a stretched figure-8 with no separation.
At 50x clear and stable separation with and without filter. Best view at 66x, a ghostly pair in pitch-black FOV, the first diffraction rings of A and B merging, that of B very faint.
With a Baader Neodymium filter the positive effects are similar to those of the KSM polarising filter, but the clarity of separation is not quite as great as with the polarising filter.
Robert Zebahl
Leipzig (Germany)
55mm (27x) AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.
Robert Zebahl
Leipzig (Germany)
63mm (26x) AB: Experiment to determine the smallest magnification to separate Castor. I observed on 2022-05-09, 2022-05-11 & 2022-05-18.
At 26x and 30x easily seen as a double star, but not clearly separable due to outshining. At 70x of course easily separated. Stopped down to 30mm aperture, Castor appeared partially separated at 26x, but very barely. The right viewing position at the eyepiece was important. At 30x with 30mm aperture, Castor was cleanly separated, but extremely tight.
Following a hint from Christopher Hay, I also used a red filter from Baader to avoid outshining at full aperture. Now also a separation at 26x was possible, whereby the components were extremely close to each other.
For me a magnification of 26x seems to be the minimum to separate Castor cleanly, if the brightness of the components is reduced sufficiently.
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.
Christopher Hay
Seeheim (Germany)
76mm (50x) AB: 18 February 2021: At 23x oval-elongated with clear position of component A. At 50x finely split. At 83x best sight with first diffraction rings slightly overlapping. At 100x nice pattern of the Airy disks and the overlapping first and second diffraction rings of both components.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 32x wirkt der Stern leicht länglich - bei 107x stehen die beiden Sterne schön eng mit überlagernden Beugungsscheibchen, die Komponenten sind dennoch getrennt erkennbar - Komponente B im Osten ist eine halbe Magnitude schwächer - ganz schwacher Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: blauweiß-weiß ../projects/double-stars/uwe-pilz/sketches/Castor.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) AB: 13.03.2017: Beide Komponenten gelblich mit geringem Helligkeitsunterschied, bereits bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_02_alpha%20Gem_Castor.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Castor. A is a very pale yellow and B is yellow-green, 2 delta mag, very bright, pretty wide, some fainter stars about. Physical with a 459.8-year period
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Two fat spotlights in space. Component B seems greenish at first sight (using a first-class reflector free of chromatic aberration), and certainly has a different hue than component A. The second diffraction rings of A and B meet.
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/Castor.jpg
★★ STF1126 AB 6m.5 7m.0 0.9" 176° 2019 CMi 07h40m06.99s / +05°13'51.90"

../images/binary-star-orbits/STF1126-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) beide gelb. Es war schwierig, die hellere Komponente zu erkennen. Direkt neben Prokyon. ../projects/double-stars/uwe-pilz/sketches/210330STF1126.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow, very close <1" hair-split, near equal brightness
★★ STF1122 7m.8 7m.8 14.9" 186° 2019 Cam 07h45m52.47s / +65°09'28.10"
René Merting
Drachhausen (Germany)
18x70 ein genialer, heller Stern für 18x-Ferngläser - ein wunderschönes enges Sternpaar, wo drei Blatt Papier dazwischen passen
Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-05-15: At 22x immediately apparent with a beautiful separation between the equally bright components. One component appeared slightly bluish, the other light orange. At 44x the subtle color difference can be seen a bit better. The double star is in a nice star field together with 51 Cam. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1122.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 72x ein gut getrenntes Pärchen zweier gleich heller Sterne - trotz vieler gleich heller Sterne im Gesichtsfeld wirkt das Doppel gut isoliert
STF1137 8m.0 9m.1 3.1" 133° 2016 CMi 07h46m35.35s / +04°07'50.10"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Der schwächere Stern ist nur indirekt sichtbar, deshalb schwierig ../projects/double-stars/uwe-pilz/sketches/210330STF1137.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light orange and blue, pretty wide, 1.5 delta mag
★★ STF1127 AB 7m.0 8m.4 5.6" 340° 2019 Cam 07h47m00.43s / +64°03'07.30"
AC 7m.0 9m.7 11.6" 178° 2019
BC 8m.4 9m.7 16.9" 173° 2019
René Merting
Drachhausen (Germany)
18x70 AC: von den Rahmendaten ist eine Trennung von A und C eigentlich möglich, aber vermutlich ist der Helligkeitsunterschied zwischen beiden Sternen von 2.7 mag zu groß - ich konnte C nicht entdecken
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-15: At 31x all three components are visible, with B still very close to component A. Component C is rather dim overall. At 57x, A appears white-yellowish, B slightly orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1127.jpg
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ist B ganz dicht nördlich an A angrenzend erkennbar (knapp getrennt), B etwas heller als C im Süden - bei 72x wird die Trennung einfacher und alle drei Sterne stehen fast auf einer Linie
AC: bei 45x ist C ganz schwach südlich von A erkennbar - bei 72x schätze ich, etwas mehr als die doppelte Entfernung AB, C wirkt grau, während A und B weiß strahlen
STF1171 6m.5 9m.9 2.1" 326° 2016 Cnc 08h01m00.78s / +23°34'59.20"
René Merting
Drachhausen (Germany)
100mm (213x) bei 142x schmiegt sich Komponente B an der Grenze zur Sichtbarkeit im Süden von Komponente A ganz dicht an den viel größeren Bruder, der ohne Beugungsringe auskommt - bei 213x zeigt sich B leicht abgesetzt von A
Robert Zebahl
Leipzig (Germany)
102mm (187x) Observation from the city at half moon. At magnifications between 187x and 280x I could see the very dim companion almost permanently near the first diffraction ring. But the diffraction ring itself was hardly visible. Main problem here was probably the low brightness of the companion.
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig. Zu ahnen bei 144x ../projects/double-stars/uwe-pilz/sketches/200303stf1171.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very tough for a Struve. B is very faint and comes to view only with seeing as a very fine point, pretty well separated from A, but A needs to be a disk for B to resolve out of the diffraction. Seen fleetingly, somewhat better with averted vision but averted vision often misses moments of best seeing. Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange, 4 delta mag! very faint and close B
★★ STF1177, 17 Cnc 6m.7 7m.4 3.5" 350° 2019 Cnc 08h05m37.06s / +27°31'46.90"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Easy to separate, but still relatively close together. Well visible difference in brightness. Color of the components was not clearly visible. Nice view overall.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x sehe ich ein knapp getrenntes schön eng stehendes Pärchen - Komponente B im Norden ist eine dreiviertel Größenklasse schwächer - das Weiß von A wirkt kühler - zurück auf 64x sehe ich eine Ameise mit dünnem Hals, in ruhigen Momenten zeigen sich beide Sterne sogar getrennt
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/200303stf1177.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) Blau und Orange - sehr schöner Farbkontrast, unterstützt durch die ähnliche Helligkeit ../projects/double-stars/uwe-pilz/sketches/210330STF1177.jpg
Christopher Hay
Seeheim (Germany)
125mm (160x) Well split despite substantial turbulence in the atmosphere. Main component creamy yellow-white, companion pale blue. A very attractive colour contrast warranting a one-star rating.
Mark McCarthy
Fremont (California/USA)
178mm (205x) Excellent, around 1 delta mag and wide, blue-white stars, nicely resolved
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF1177.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellowish, 1 delta mag, ~4"
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern, mit gut erkennbaren Helligkeitsunterschied . Der hellere Stern leuchter weiß-gelblich, während der schwächere leicht bläulich schimmert. Schöner Farbkontrast
★★★ zeta Cnc, 16 Cnc STF1196 AC 5m.3 5m.8 6.2" 62° 2020 Cnc 08h12m12.79s / +17°38'51.20"
STF1196 AB-C 4m.9 5m.8 6.0" 64° 2020
STF1196 AB 5m.3 6m.2 1.2" 2020
HUT1 Ca-Cb 6m.2 7m.1 0.3" 2020

../images/binary-star-orbits/STF1196-AB-C-orbit.jpg ../images/binary-star-orbits/STF1196-AB-orbit.jpg ../images/binary-star-orbits/HUT1-Ca-Cb-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1196.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) AB-C: Finely split. AB yellowish. Substantial delta-mag.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB-C: Easy to separate. A: light grey, B: pale orange.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C clearly split, AB obviously elongated but not split
Uwe Pilz
Leipzig (Germany)
105mm (288x) weißblau-gelb-gelb ../projects/double-stars/uwe-pilz/sketches/zetaCnc.jpg
Robert Zebahl
Leipzig (Germany)
120mm (67x) AB-C: Evident difference in brightness, easy to split. Both components of similar color.
Robert Zebahl
Leipzig (Germany)
120mm (200x) AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star! ../projects/double-stars/robert-zebahl/sketches/2019-02-24_stf1196.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: Sehr schön, 3-fach Stern, A = weißgelb, B = weißgelb, C = weißgelb ../projects/double-stars/winfried-kraeling/sketches/180408_02_Zeta%20Cnc.jpg
Sarah Gebauer
Germany
150mm (83x) AB-C: bei 83x sind AB-C sauber getrennt, laut Atlas 2020 6,1'' Abstand, die Komponenten A und B mit 1,1'' lassen sich nicht trennen, viele schöne Feldsterne dabei ../projects/double-stars/sarah-gebauer/sketches/20200411%20Zeta%20Cnc%20DSk.jpg
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Hair-fine split. A and B both yellowish-white. C wide from AB, bluish-white, nice colour contrast to AB.
Frederik Wanink
Itterbeck (Germany)
254mm (200x) AB-C: AB (1,1") nicht bemerkt ../projects/double-stars/frederik-wanink/sketches/STF1196.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Ca-Cb: not quite round, oval/olive shaped. It is the AB-C of STF 1196.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Triple, all near equal magnitude, yellow-white. AB ~0.8", hair split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Triple, all near equal magnitude, yellow-white. AC ~6", wide split.
Karsten Kopp
Köln (Germany)
600mm (257x) AB: Die Komponenten AB-C bei etwas größerem Helligkeitsunterschied einfach zu trennen und auch schön anzusehen. Sterne erstrahlen weißlich gelb. Komponente AB war nicht zu trennen.
★★ STF1224, 24 Cnc A-BC 6m.9 7m.5 5.7" 53° 2019 Cnc 08h26m39.82s / +24°32'03.70"
Uwe Pilz
Leipzig (Germany)
105mm (128x) fahlviolett und gelb ../projects/double-stars/uwe-pilz/sketches/210330STF1224.jpg
★★ STF1223, phi 2 Cnc 6m.2 6m.2 5.2" 219° 2019 Cnc 08h26m47.08s / +26°56'07.80"
Christopher Hay
Seeheim (Germany)
25x80 Hair-fine, but definite and constantly held split. Charming in 3.3° FOV with Phi1 and Chi Cnc.
Easier than I would have thought at only 25x. This is clearly aided by the very well-matched brightnesses of the components. The 70% full moon nearby in Leo also helps, as its brightness boosts the eyes' acuity. During the observation I gaze intentionally directly into the moon at intervals in order to utilise this effect, a technique honed in earlier binocular observations of planets.
Primary is slightly brighter than the secondary, again surprising considering that delta-mag is only 0m05 (6m16 to 6m21 according to Stelledoppie). Not a physical pair, alas, although it looks so much like one.
Christopher Hay
Seeheim (Germany)
36mm (33x) Hairfine split at 33x, clearer at 40x, quite clear at 50x.
Uwe Pilz
Leipzig (Germany)
105mm (28x) weiß und gelb ../projects/double-stars/uwe-pilz/sketches/210330Phi2Cnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schön, blauweiß-gelbweiß ../projects/double-stars/uwe-pilz/sketches/stf1223.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) Bright white, equal, wide -- dramatic but not much. Not physical
Karsten Kopp
Köln (Germany)
600mm (180x) Schöner und einfach zu trennender Doppelstern, wo beide Sterne dieselbe Helligkeit haben und weißlich strahlen. Wie ein Augenpaar im All
STF1230 9m.3 10m.6 33.8" 186° 2017 Cnc 08h28m25.95s / +16°51'09.10"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Komponente B nur indirekt. bei 88x erahnbar. ../projects/double-stars/uwe-pilz/sketches/200323STF1230.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Einfacher Doppelstern mit größerem Helligkeitsunterschied.
★★ STF1245 AB 6m.0 7m.2 10.1" 25° 2020 Cnc 08h35m51.05s / +06°37'13.90"
AC 6m.0 10m.7 99.8" 109° 2020
AD 6m.0 11m.9 109.1" 292° 2020
AE 6m.0 9m.6 113.2" 207° 2020
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB at 22x separated, but very close, uneven pair. A appeared white-yellowish, B orange, partly reddish. Opposite in a wide separation the fainter component E was visible. At 57x, A appeared white-yellowish, B orange. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1245.jpg
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein sehr enges Pärchen, gerade so getrennt - das Sternpaar ist heller, als viele andere Sterne in der unmittelbaren Umgebung, dadurch ist es sehr auffällig - Komponente A strahlt reinweiß, B steht dem in nichts nach, auch wenn die Komponente gut eine Magnitude schwächer ist
Sarah Gebauer
Germany
100mm (45x) AB: schmal, aber deutlich getrennt, die südliche Komponente sichtbar heller, die nordöstliche schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB ../projects/double-stars/uwe-pilz/sketches/200323STF1245.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB: Wide and bright pair, light yellow and orange, easy, slight mag difference
Karsten Kopp
Köln (Germany)
600mm (180x) AB: AB: Schöner und einfacher Doppelstern, wobei die Komponente A weißlich gelb und Komponente B gelblich orange leuchtet. Das Sternfeld in direkter Umgebung rundet den schönen Eindruck ab.
STF1270 6m.9 7m.5 4.7" 265° 2020 Hya 08h45m20.79s / -02°36'03.70"
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x hatte ich schon den richtigen Verdacht, bei 64x ist es eindeutig, beide Sterne stehen knapp getrennt schön eng zusammen - Komponente A im Osten wirkt cremeweiß, B eher weißblau
Uwe Pilz
Leipzig (Germany)
120mm (94x) ../projects/double-stars/uwe-pilz/sketches/220323STF1270.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) MX Hya. Wide, yellow-white, half delta mag. Nice
★★ STF1268, iota Cnc, 48 Cnc 4m.1 6m.0 31.3" 307° 2020 Cnc 08h46m41.82s / +28°45'35.60"
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld. Secondary a pinprick of light directly next to the overpowering primary. Slightly uncertain, but PA as seen confirmed afterwards in database. In stabilised 15x45 binoculars the pair is well split, primary white tending towards yellow, secondary substantially colder.
A physical double at a distance to us of 331 light years.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Well split. Primary very pale yellow, secondary very pale blue. A most striking pair.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-bluish.
Christopher Hay
Seeheim (Germany)
71mm (32x) Compact pair. Yellow, pale blue. Totally dominates 2.2° FOV.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Grand sight! Pretty wide apart and unequal. A: mild orange, B: very nice light blue.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) wide pair with nice colour contrast yellow/blue
Uwe Pilz
Leipzig (Germany)
105mm (28x) fahlblau und gelborange ../projects/double-stars/uwe-pilz/sketches/210330iotaCnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb-blaugrau ../projects/double-stars/uwe-pilz/sketches/iotaCnc.jpg
Sarah Gebauer
Germany
150mm (125x) bei 83x schon deutlich getrennt, der Farbkontrast ist gut zu sehen, er wird bei 125x noch stärker, ein zartes Blau und Gelb sind zu sehen ../projects/double-stars/sarah-gebauer/sketches/20200411%20i%20Cnc%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Iot Cnc: Pretty orange and pale blue, showpiece object.
★★★ 11 Hya, epsilon Hya SP1 AB 3m.5 5m.0 0.2" 241° 2018 Hya 08h46m46.51s / +06°25'07.70"
STF1273 AB-C 3m.5 6m.7 2.9" 311° 2020
STF1273 AB-D 3m.5 12m.5 18.1" 201° 2017
STF1273 AB-E 3m.5 10m.8 340.5" 2015
STF1273 AB-F 3m.5 10m.4 406.5" 265° 2015

../images/binary-star-orbits/SP1-AB-orbit.jpg ../images/binary-star-orbits/STF1273-AB-C-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Sarah Gebauer
Germany
100mm (200x) AB-C: ist ein heller Stern vom Hydra-Kopf, nicht zu trennen, vermutlich, weil die Komponente AB zu hell strahlt
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB-C: bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB-C: Epsilon Hya A is bright orange-yellow, B is much fainter and a little blue, ~3". [SP 1 AB is 3.49/5.00 0.2" not seen]
STF1276 AB 8m.3 8m.6 12.7" 353° 2017 Cnc 08h47m10.99s / +11°09'34.20"
Robert Zebahl
Leipzig (Germany)
16x70 2022-03-02: Pretty tight, medium bright double star with small difference in brightness.
Sarah Gebauer
Germany
100mm (45x) das enge Pärchen bei 45x ist deutlich getrennt, die dritte Komponente landete unwissenderweise sogar auch auf der Zeichnung ../projects/double-stars/sarah-gebauer/sketches/STF1276.jpg
Mark McCarthy
Fremont (California/USA)
178mm (148x) Wide, white, near equal stars, nice
STF1281 AB 7m.8 9m.0 53.1" 310° 2017 Hya 08h47m36.90s / +00°01'04.30"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein weit auseinander stehendes Paar - Komponente B im NW ist halb so hell und wirkt gräulich gegenüber der buttergelben Komponente A - zurück auf 20x ist B noch nicht zu schwach und immernoch gut getrennt von A erkennbar
Uwe Pilz
Leipzig (Germany)
120mm (94x) nicht als Mehrfachstern erkennbar, eher wie drei Feldsterne ../projects/double-stars/uwe-pilz/sketches/220323STF1281.jpg
BU335 7m.5 9m.4 2.6" 265° 2017 Hya 08h48m12.24s / +02°34'48.40"
Sarah Gebauer
Germany
100mm (200x) auch bei 200x nicht zu trennen
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig ../projects/double-stars/uwe-pilz/sketches/200323BU335.jpg
Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220323BU335.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) 3 delta mag, well split ~3", very pleasing pair, white A and slightly red B
BU587 & H5 120, 15 Hya BU587 AB 5m.8 7m.4 1.2" 121° 2017 Hya 08h51m34.44s / -07°10'38.00"
H5 120 AB-C 5m.5 11m.4 45.6" 2015
BU587 AB-D 5m.5 12m.1 55.5" 56° 2015
Uwe Pilz
Leipzig (Germany)
120mm (360x) 94x & 360x ../projects/double-stars/uwe-pilz/sketches/220323_15Hya.jpg
STF1291, 57 Cnc AB 6m.1 6m.4 1.5" 310° 2019 Cnc 08h54m14.65s / +30°34'45.80"
AB-C 5m.5 9m.2 54.6" 204° 2015

../images/binary-star-orbits/STF1291-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Immediately apparent as a double star. Diffraction disks overlapping slightly ('8'). Difference in brightness visible.
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb ../projects/double-stars/uwe-pilz/sketches/57Cnc.jpg
Sarah Gebauer
Germany
150mm (125x) AB: sowohl bei 83x als auch bei 125x knapp vorm Trennen
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 57 Cnc. Very nice pair, strong orange yellow colors, ~1 delta mag, bright, nice close split
★★ STF1306, sigma 2 UMa, 13 UMa AB 4m.9 8m.8 4.4" 346° 2020 UMa 09h10m23.53s / +67°08'03.30"
AC 4m.9 10m.3 197.8" 148° 2003

../images/binary-star-orbits/STF1306-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) AB: Companion almost permanently visible as elongated, non-condensed brightening of the first diffraction ring of the primary component at the correct position angle.
Christopher Hay
Seeheim (Germany)
76mm (20x) AB, April 2021: No luck with AB at all magnifications from 83x to 167x.
AC: Component C very faint and quite distant, not really seeming to belong.
Mark McCarthy
Fremont (California/USA)
80mm (150x) AB: Suspected very close unequal white stars. 920-year period, slowly widening
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: sehr schwierig bei 88x ../projects/double-stars/uwe-pilz/sketches/200316stf1306.jpg
STF1336 7m.0 11m.1 40.1" 180° 2015 Hya 09h17m32.92s / +00°33'17.80"
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr weit, kein Doppelstern-Eindruck ../projects/double-stars/uwe-pilz/sketches/200323STF1336.jpg
STF1333 6m.6 6m.7 1.8" 50° 2018 Lyn 09h18m25.97s / +35°21'51.30"
Robert Zebahl
Leipzig (Germany)
63mm (120x) At 93x seen as '8', at 120x split, but pretty tight with no visible difference in brightness.
Christopher Hay
Seeheim (Germany)
71mm (32x) Elongated with clear PA.
Uwe Pilz
Leipzig (Germany)
105mm (200x) fast gleich hell, beide gelblich, bei 66x schwierig ../projects/double-stars/uwe-pilz/sketches/stf1333.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Hairfine split, evenly matched pair, rather attractive. No particular colour.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Brilliant white pair, near equal, ~2" separation
STF1334, 38 Lyn AB 3m.9 6m.1 2.6" 224° 2019 Lyn 09h18m50.64s / +36°48'09.30"

../images/binary-star-orbits/STF1334-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
60mm (198x) Aufhellung im ersten Ring
Robert Zebahl
Leipzig (Germany)
63mm (140x) Fainter companion only seen as permanent brightening on the first diffraction ring. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf1334.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) Figure-8 with clear positions and delta-mags of components. Bluish-white.
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb, trennbar bei 66x ../projects/double-stars/uwe-pilz/sketches/38Lyn.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very bright light blue A and 3 delta magnitude greenish B, close, about 3" separation. Physical with 2782 year period
Christopher Hay
Seeheim (Germany)
180mm (113x) Clean split, large delta-mag. Separation ca. 1.5 times that of nearby STF1333.
STF1331 AB 8m.5 8m.7 0.9" 153° 2017 UMa 09h20m46.02s / +61°20'58.40"
AC 8m.5 11m.6 13.5" 186° 2015
AD 8m.5 14m.5 19.4" 117° 2015
AE 8m.5 9m.8 139.1" 223° 2015
Robert Zebahl
Leipzig (Germany)
152mm (180x) 2020-04-13: The wide pair AE is already visible at 22x with a significant difference in brightness, but quite inconspicuous. A appeared white-yellowish, E rather orange. The close pair AB appeared immediately elongated at 129x, partly visible as '8'. At 180x, AB was just separated with a fine black space between them. The faint C component was only visible with averted vision. Best view at 180x. The even fainter D component was out of range. ../projects/double-stars/robert-zebahl/sketches/2020-04-13_stf1331.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Fine hairline split with seeing at 205x, better split at 333x, almost 1 delta mag, a very fine pair. Three other faint stars appear with averted vision, and can then barely hold them direct, all nearby and arranged in a right angle to A with two of them on one side. These are C, D, and E
★★ STF1347 7m.3 8m.3 21.1" 312° 2016 Hya 09h23m15.76s / +03°30'05.00"
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-10: At 22x beautifully separated at moderate separation and difference in brightness. Primary component appeared white-bluish, companion slightly orange. At 44x the primary component looked more white-yellowish, the companion showed a clear tendency to orange.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein auffälliges Sternpaar - Komponente B im Nordwesten ist gut abgesetzt erkennbar und ca. ein 3/4 Größenklasse schwächer - bei 20x rücken die beiden Sterne richtig schön zusammen und sind noch knapp getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schöner Farbkontrast ../projects/double-stars/uwe-pilz/sketches/200323STF1347.jpg
★★ STF1348 AB 7m.5 7m.6 2.0" 314° 2018 Hya 09h24m28.48s / +06°21'01.80"

../images/binary-star-orbits/STF1348-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STF1348-AB-orbit-solution-2.jpg ../images/binary-star-orbits/STF1348-AB-orbit-solution-3.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, at 80x clearly visible as figure '8'. At 100x a very small difference in brightness was to be guessed, at 133x visible. Near the double star STF 1355.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1355, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very pretty half delta mag, ~2" pair, white. Sharp despite low declination
★★ STF1355 7m.7 7m.8 1.8" 357° 2018 Hya 09h27m16.69s / +06°13'59.00"

../images/binary-star-orbits/STF1355-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, equally bright. At 80x detectable notch. At 100x and 133x clearly visible as figure '8'. Near the double star STF 1348.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1348, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow pair, near equal, very nice, ~2"
STF1349 7m.5 9m.0 19.2" 166° 2015 UMa 09h31m09.89s / +67°32'28.40"
René Merting
Drachhausen (Germany)
18x70 einfacher als der benachbarte Doppelstern STF 1350 - ordentlich getrennt - Komponente B ist 1 bis 1.5 Größenklassen schwächer
Christopher Hay
Seeheim (Germany)
60mm (25x) At 25x a wide split, substantial difference in brightness, B a fine pinprick of light. B appears light blue at first, but colour impression disappears quickly - an interesting visual effect repeated several times. According to Stelledoppie a true physical pair. Nice together with Struve 1350 in same FOV. A very fine double-double for very small apertures.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x easy to separate with significant difference in brightness. The primary component appears whitish, the companion darker. At 44x, the primary component looks rather white-yellowish, the companion greyish.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x stehen beide Sterne bequem getrennt auseinander - Komponente B im Süden ist eine knappe Größenklasse schwächer und kupfergrau - ein schönes Doppel-Doppel zusammen mit STF1350 gut 47' weiter südsüdöstlich
Uwe Pilz
Leipzig (Germany)
105mm (88x) sichtbar bei 21x ../projects/double-stars/uwe-pilz/sketches/200316stf1349.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x steht das Pärchen gut auseinander - Komponente B ist eine dreiviertel Größenklasse schwächer und wirkt grauweiß - A ist weiß mit einem zarten Stich ins Gelbe
★★ STF1350 AB 8m.3 8m.3 10.2" 249° 2015 UMa 09h34m19.56s / +66°47'42.30"
AC 8m.3 9m.2 131.0" 216° 2015
René Merting
Drachhausen (Germany)
18x70 AB: ein sehr enger Doppelstern, äußerst knapp getrennt … und das auch nur in guten Momenten, ansonsten wirkt das Paar wie eine Ameise - beide Sterne sind gleich hell - ein FG-Tester für 18x
Christopher Hay
Seeheim (Germany)
60mm (25x) AB: Tight but nicely split at 25x. No colour whatsoever seen. A appears brighter than B, whereby the data do not support this – perhaps a product of different (yet not seen) colouration? According to Stelledoppie not a physical pair. Attractive together with Struve 1349 in same field of view.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x A & B equally bright and still pretty close together. Component C is visible at a much greater distance. At 44x, A & B show a color difference: orange, white-bluish.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein schönes enges Paar zweier gleich heller Sterne, knapp getrennt - STF1350 AB bildet mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense
AC: bei 32x bildet STF1350 AB mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense - der erste der vier Sterne bzw. der nächststehende Stern südsüdwestlich mit mehr als zehnfachem Abstand AB ist Komponente C, er ist schätzungsweise eine halbe Größenklasse schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: trennbar bei 21x. Fast gleichell, aber deutlicher Farbkontrast, lohnend. ../projects/double-stars/uwe-pilz/sketches/200316stf1350.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 22x, all three components are already visible, with A & B still standing quite close together. Component C is less prominent. At 69x and 100x, the pair AB shows a nice color contrast: The eastern component mostly appeared in a slightly shiny orange, while the other component appeared more white-bluish. During the observation, however, the colors changed between both components. At the time of observation, the pretty bright comet C/2019 Y4 Atlas was also in the same field of view - a great scene! Note to the sketch: The positions of the stars to each other do not exactly match, also the alignment of the pair AB to C. ../projects/double-stars/robert-zebahl/sketches/2020-03-18_stf1350_c2019_y4_atlas.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) AB: Immediately striking in 32x71 superfinder wihle panning through the area, a very evenly matched pair well split at that power. Closer inspection with the 7-inch at 113x reveals a fine blue-orange colour contrast between components A and B.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß
STF1366 8m.4 10m.1 7.8" 321° 2019 UMa 09h35m42.47s / +53°17'40.40"
Uwe Pilz
Leipzig (Germany)
120mm (94x) mit STF 1368 ../projects/double-stars/uwe-pilz/sketches/220604STF1366-1368.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) This one is a 2 delta magnitude pair, about 8", pretty wide. Physical. There is another wide near equal pair to the east about 30" away
★★ STF1424, gamma Leo, 41 Leo, Algieba AB 2m.4 3m.6 4.7" 127° 2020 Leo 10h19m58.35s / +19°50'29.40"

../images/binary-star-orbits/STF1424-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STF1424-AB-orbit-solution-2.jpg

Christopher Hay
Seeheim (Germany)
20x60 Handheld in reclining chair, binoculars with internal stabilisation. 14 May 2022 (4.7" angular distance according to database): Pear-shaped. Strong orange-lemon yellow, a fruity affair. PA estimated 140° without prior knowledge, a good enough match, considering the low magnification, to the database figure of 127° ascertained post-observation.
Christopher Hay
Seeheim (Germany)
44x100 21 May 2022 (4.7" angular distance according to database): Hairfine split, slightly difficult due to bloated stars in these achromatic (not apochromatic) binoculars. Both components orange, with secondary going into yellow. Thin cloud moving through tightens up the star images and makes the split much clearer. Clearest shortly before clouds become so dense as to swallow the pair.
Christopher Hay
Seeheim (Germany)
36mm (50x) 21 May 2022 (4.7" angular distance according to database): At 40x deeply notched, at 50x tenuously split, at 66x cleanly and clearly split.
Robert Zebahl
Leipzig (Germany)
55mm (38x) At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_gamma_leo.jpg
Robert Zebahl
Leipzig (Germany)
55mm (59x) Very nice unequal double. A appeared yellow-orange, B rather white-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_gamma_leo.jpg
Christopher Hay
Seeheim (Germany)
60mm (58x) At 25x Algieba is already very elongated. At 58x a sliver of dark between the components, with clear brightness difference. At 70x split becomes more stable, but view not so pleasing as at 58x. Both components display vivid orange.
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 67x still a relatively close pair, but well separated with quite a clear difference in brightness. At 100x easy to separate and visible color difference: A yellowish to slightly orange, B white-yellowish.
Robert Zebahl
Leipzig (Germany)
102mm (125x) Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) very bright double star, slight colour contrast
Uwe Pilz
Leipzig (Germany)
105mm (120x) schon bei 37x sehenswert; trennbar bei 55x; orange-blauweiß
Robert Zebahl
Leipzig (Germany)
120mm (66x) At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: merklicher Helligkeitsunterschied, A = gelb-orange, B = gelb-orange ../projects/double-stars/winfried-kraeling/sketches/180408_04_Gamma%20Leo.jpg
Sarah Gebauer
Germany
150mm (83x) bei 83x sauber getrennt, ein leichter Farbunterschied (Weiß und helles Gelb) sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200411%20Gamma%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Algieba: Bright yellow and yellow-orange pair, 1 delta mag, 4-6"
René Merting
Drachhausen (Germany)
320mm (240x) bei 240x sehe ich zwei ordentlich getrennte Sterne (naja, nicht wirklich Sterne, sondern wild zappelnde Glitzerbällchen) - Komponente A strahlt in einem zarten Gelb, B ist weiß - zurück auf 144x sehe ich nur ein Stäbchen mit leichter Einschnürung, so wild tanzen die Sterne
Mark McCarthy
Fremont (California/USA)
508mm (333x) Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire
STTA104 7m.2 7m.3 209.0" 287° 2013 LMi 10h24m22.19s / +34°10'35.00"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Wide, striking matched pair. Nice together with triangle of 27/28/30 LMi, and thus also easy to find. HJL1057 also in field to southwest.
Delicate colour contrast in the triangle makes this a very attractive field: 30 LMi is yellowish-white, 28 reddish-white, 27 LMi colder.
In 15x45 binoculars STTA104 becomes almost too wide to feel it is a double, but the colour contrasts in the triangle become clearer.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Very wide pair of similarly bright components, unremarkable color. The double star stands close to the stars 27, 28 & 30 LMi and is probably more appealing in smaller binoculars. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_stta104.jpg
STF1466, 35 Sex AB 6m.2 7m.1 6.8" 240° 2019 Sex 10h43m20.91s / +04°44'51.60"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein wunderschönes dicht stehendes Pärchen, knapp getrennt - Helligkeitsunterschied eine halbe Größenklasse - leichter Farbkontrast, A leicht gelblich
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very nice view. At 28x obviously unequal and easy to split. A appeared slightly orange. At 86x B appeared grey-blue. ../projects/double-stars/robert-zebahl/sketches/2019-04-06_35_sex.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Orange and a little blue, wide separation, bright, half a delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (333x) 35 Sex. Easy, wide, yellow-orange pair, ~2 delta mag. AC much further separated and 1 delta mag. [SkyTools showed a close CD pair: Hint of elongation with 533x, elongation is larger but more hazy at 1067x, but not resolved into stars -- but this one not in Stelle Doppie.]
42 LMi S612 AB 5m.3 7m.8 196.4" 174° 2019 LMi 10h45m51.91s / +30°40'56.60"
ARN3 AC 5m.3 8m.3 424.6" 94° 2013
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Panning around in the area the triangle of ABC is immediately striking. Component A cold-white, B reddish, C no particular colour.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Wide, striking triple system, which can be well observed with binoculars. A: quite bright, rather white, B: slightly orange, C: tending to orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_42_lmi.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) AB: Very widely separated, split in finder (196"!). white A with a slightly red B
S617 6m.2 8m.7 35.2" 179° 2017 Leo 10h53m24.96s / -02°15'18.80"
René Merting
Drachhausen (Germany)
18x70 unauffällig - Komponente B ist ordentlich getrennt südlich von A erkennbar - Helligkeitsunterschied eine Magnitude (2.49 mag lt. Stelle Doppie!) - A reinweiß, B grau
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-03-31: Clearly separated with distinct difference in brightness. Color wise unremarkable. Nearby there is a brighter star. ../projects/double-stars/robert-zebahl/sketches/2020-03-31_s617.jpg
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ist B im Süden von A mit ordentlich Abstand erkennbar - A ist warmweiß, leicht gelblich, die deutlich schwächere Komponente B wirkt farblos - das Sternpaar ist interessant in Kombination mit dem unmittelbar nordöstlich stehenden gelblich strahlenden Stern Rho? Leo
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A, blue B, wide separation
STF1487, 54 Leo 4m.5 6m.3 6.6" 112° 2020 Leo 10h55m36.80s / +24°44'59.00"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x split, but very tight with noticeable difference in brightness. At 71x easy to separate. No visible color difference.
Robert Zebahl
Leipzig (Germany)
70mm (67x) 2021-04-13: At 67x beautifully separated with clearly visible difference in brightness. Very attractive is the subtle color difference: light yellow & light blue. At 133x the color of the companion is a bit more pale: grey-blue. The primary component still shines in a beautiful light yellow.
Winfried Kräling
Marburg (Germany)
127mm (250x) 13.03.2017: Hauptkomponente gelblich, Begleiter bläulich, deutlicher Helligkeitsunterschied. Ebenfalls bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_03_54%20Leo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white pair (4.5, 6.3) wide sep (6")
Mark McCarthy
Fremont (California/USA)
508mm (333x) 54 Leo. Brilliant pair, light white-yellow stars, ~2 delta mag, wide
★★ BU1077, alpha UMa, 50 UMa, Dubhe AB 2m.0 5m.0 0.8" 342° 2017 UMa 11h03m43.84s / +61°45'04.00"
AC 2m.0 7m.2 384.5" 206° 2020

../images/binary-star-orbits/BU1077-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
7x45 AC: AC: Very wide apart but still feel as if belonging together. A golden-yellow, C seems blue, a very attractive pair.
A, B and C are a physical triple system at a distance to us of 123 light years. This is incidentally almost exactly the same distance to us as SMA75 AB, a further wide binocular pair in UMa.
René Merting
Drachhausen (Germany)
18x70 AC: Dubhe oder Alpha Ursae Majoris - hm, naja - C zeigt sich im Süden in Riesenabstand zum intensivgelbem A - Komponente C wirkt dagegen wie eine graue Maus und der Helligkeitsunterschied ist so enorm, dass er nicht abschätzbar ist
Christopher Hay
Seeheim (Germany)
36mm (8x) A wide pair but still appearing visually to belong together. Component A is a creamy gold-white. Component C is pale blue, but the colour impression fades after looking for a while. In parallel observation with 3-inch at 32x and 7-inch at 67x I see no particular colour of C, an interesting difference to observation with one-and-a-half-inch. I take a look with 7x42 binoculars and the blue impression is there again, as always with binoculars of all kinds.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: 2020-04-07: Very wide, uneven & inconspicuous pair. A appeared white-yellowish, for C I could not detect any color.
Uwe Pilz
Leipzig (Germany)
120mm (120x) ../projects/double-stars/uwe-pilz/sketches/220409Dubhe_SApo_140.jpg
Robert Zebahl
Leipzig (Germany)
152mm (43x) AC: 2022-04-12: Very wide and uneven pair. Component A shines in a bright, brilliant orange, companion C looks rather white.
Robert Zebahl
Leipzig (Germany)
152mm (200x) AB: 2022-04-12: At magnifications between 200x and 400x, there was nothing even close to a double star to be seen. The air was simply too turbulent.
STF1517 & BU1431 STF1517 AB 7m.5 8m.0 0.7" 313° 2018 Leo 11h13m40.99s / +20°07'43.30"
BU1431 AB-C 7m.5 10m.8 246.1" 97° 2015

../images/binary-star-orbits/STF1517-AB-orbit.jpg

Sarah Gebauer
Germany
100mm (200x) STF1517 (AB): die Komponenten AB und C lassen sich natürlich problemlos bei geringer Vergrößerung trennen, für A und B reichen auch 200x nicht aus (Beobachtungsversuch erfolgte ohne vorherige Recherche, denn 0,7'' schafft mein Refraktor nicht)
Robert Zebahl
Leipzig (Germany)
102mm (187x) STF1517 (AB): 2020-03-28: At 187x the double star immediately appears elongated, but without notching. On closer observation, the slight difference in brightness could be detected. Not better at higher magnifications. Observation at quite good seeing (4/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) STF1517 (AB): länglich ../projects/double-stars/uwe-pilz/sketches/200327stf1517.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) STF1517 (AB): 2020-03-27: Clearly elongated. In some moments the double star appeared notched with a small difference in brightness. Observation at moderate seeing (3/5).
Mark McCarthy
Fremont (California/USA)
317mm (340x) STF1517 (AB): Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (533x) STF1517 (AB): Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal
★★ STF1523, xi UMa, 53 UMa, Alula Australis AB 4m.3 4m.8 2.3" 152° 2020 UMa 11h18m10.90s / +31°31'45.00"

../images/binary-star-orbits/STF1523-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (83x) 2019-02-09: Already seen as '8' at 83x. At 125x the overlapping of both Airy disks was visible, but also a slight difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_xi_uma.jpg
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2018-02-18: Very close together with similar brightness. At first glance seen as an '8', looking closer I partly split both components. Similar view also at 128x.
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-03-15: Splendid sight! Beautifully separated with almost touching diffraction disks. The rather small difference in brightness was well visible. The diffraction rings of both components coalesced.
Mark McCarthy
Fremont (California/USA)
80mm (150x) Alula australis. Slight magnitude difference, hairline split, light yellow A and darker yellow B.
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-16: Awesome! Bright with lovely, subtle diffraction rings. The distance between both components is a smaller than the diameter of the diffraction disk of the fainter component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Gemessen: 162°
Robert Zebahl
Leipzig (Germany)
120mm (168x) 2018-02-14: Well split with slight difference in brightness.
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2019-02-06: Well split with visible difference in brightness. The colors of both components appeared equal.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Alula Australis. Short period. Pretty orange-yellow stars, ~half delta mag, ~2" separation
STF1536, iota Leo, 78 Leo AB 4m.1 6m.7 2.2" 93° 2019 Leo 11h23m55.37s / +10°31'46.90"
AB-C 4m.1 11m.1 332.1" 346° 2015

../images/binary-star-orbits/STF1536-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: 2020-03-28: The companion was well visible as brightening on the diffraction ring of the primary component. Sketch see observation with my 102mm refractor.
Sarah Gebauer
Germany
100mm (200x) AB: selbst bei 200x nur manchmal getrennt, eher schwierig mit Amiciprisma
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: 2020-03-28: At 125x clearly separated. A very beautiful sight! The companion was visible as almost round brightening close to the first diffraction ring of the primary component. The diffraction ring itself appeared very fine. At 224x also a very nice sight with a clear diffraction ring and the companion, which now appeared roundish. ../projects/double-stars/robert-zebahl/sketches/2020-03-28_iota_leo_stf1536.jpg
Mark McCarthy
Fremont (California/USA)
317mm (340x) AB: Quite close, very bright yellow white A and brownish B, split in A's diffraction ring
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Iota Leo. Light orange A and a richer orange B, ~2 delta mag, ~2" separation
★★ STF1540, 83 Leo AB 6m.5 7m.5 28.6" 146° 2019 Leo 11h26m45.32s / +03°00'47.20"
Stefan Loibl
Rosenheim (Germany)
10x50 clearly split, little difference in magnitude
Christopher Hay
Seeheim (Germany)
10x56 On tripod. Neat split. Attractive 6.3° FOV with a sprinkling of several 5- to 7-mag stars to the south. Tau Leo widely split directly to southeast.
In 15x60 on tripod well split, component A slightly orange, forms a fine double-double with Tau Leo.
83 Leo is a physical double at a distance to us of only 58 light years.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Splendid sight together with the double star tau Leo as well as 82 Leo. Beautiful star field. 83 Leo very nicely separated with moderate difference in brightness. Yellowish orange & slightly orange.
René Merting
Drachhausen (Germany)
18x70 ein ordentlich getrenntes und dennoch schön eng stehendes Pärchen - Komponente A ist leicht gelblich, Komponente B im SO ist eine dreiviertel Magnitude schwächer und grauweiß
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, in same field as Tau.
Mark McCarthy
Fremont (California/USA)
178mm (205x) Light orange-yellow A and light blue B, >1 delta mag, very wide. Physical with 32,000-year period. Running this through the Plot Tool with EDR3 data, it confirms it is physical, only 18 parsecs / 58 light years away (which is why it has such a high proper motion) and 520 AU separation
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A and reddish B wide separation.
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x steht das Paar zwar weit auseinander, es wirkt aber trotzdem gut zusammengehörend - Komponente B im SO ist eine dreiviertel Magnitude schwächer
★★ STFA19, 84 Leo, tau Leo AB 5m.0 7m.5 89.2" 181° 2019 Leo 11h27m56.23s / +02°51'22.50"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Comfortably split. Component A is mildly orangish-yellow.
Can't quite eke out 83 Leo's secondary (NELM 5m0, elevation 40°).
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Wide pair. Component A dull golden-yellow, component B seems bluish. Attractive.
In 15x60 on tripod very wide. Component A very mild orange, B grey-blue. Fine sight in 3.3° FOV together with well-split 83 Leo.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Splendid sight together with the double star 83 Leo as well as 82 Leo. Beautiful star field. Tau Leo beautifully separated with significant difference in brightness. Yellowish & bluish.
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with 83 Leo stunning view. Noticeable unequal. A appeared white-yellowish with a hint of orange, B grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, the A star is prismatic in color effects, bluish B
Mark McCarthy
Fremont (California/USA)
317mm (340x) Bright yellow A, bluish B, very widely separated
STF1547, 88 Leo AB 6m.3 9m.1 15.7" 330° 2020 Leo 11h31m44.94s / +14°21'52.20"

../images/binary-star-orbits/STF1547-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (42x) Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x erscheint Komponente B nordwestlich von A etwas mehr als knapp getrennt ganz schwach, bestimmt 3 Größenklassen Helligkeitsunterschied - Komponente A warmweiß, B ist grau
Sarah Gebauer
Germany
100mm (45x) fein, aber gut getrennt, die südliche Komponente ist deutlich heller, die nordwestliche zeigt sich als ganz schwacher Punkt
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb und violett ../projects/double-stars/uwe-pilz/sketches/210427_88Leo.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very light yellow and 2 delta, very wide B. Physical, with a 3453-year period, it is also close-by at 23.33 pc
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Der Doppelstern ist getrennt.Bläulich-weiß - orange-leicht rötlich. Etwas schwächerer Begleiter.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 88 Leonis: A favorite! Yellow and blue pair, wide
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x ein schönes enges Sternpaar, ordentlich getrennt - Komponente A strahlt hellgelb, B ist deutlich schwächer und empfiehlt sich mit einem Kupferton - ein schöner Farbkontrast
★★★ STF1552, 90 Leo AC 6m.3 9m.8 63.4" 235° 2018 Leo 11h34m42.50s / +16°47'48.90"
AB 6m.3 7m.3 3.1" 209° 2018
Robert Zebahl
Leipzig (Germany)
55mm (42x) AB: A and B very tight and unequal. Much fainter component C very wide apart. All components almost in line. Very nice view. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_90_leo.jpg
Sarah Gebauer
Germany
100mm (136x) lange Zeit nach der ersten Beobachtung nun auch die Komponenten A und B getrennt, was bei 136x gut gelingt ../projects/double-stars/sarah-gebauer/sketches/90%20Leo2.jpg
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 64x wirken die Komponenten A und B wie eine 8 - bei 142x dann die Gewissheit, B ist jetzt allein erkennbar, vom Positionswinkel südwestlich, aber etwas südlicher als C - Helligkeitsunterschied eine dreiviertel Größenklasse - B wirkt hellorange gegen die weiße Komponente A
AC: bei 32x ist Komponente C ziemlich weit südwestlich von A erkennbar - Helligkeitsunterschied mindestens 2.5 Größenklassen
Uwe Pilz
Leipzig (Germany)
105mm (88x) bläulich und violett ../projects/double-stars/uwe-pilz/sketches/210427_90Leo.jpg
Sarah Gebauer
Germany
150mm (30x) AB: einfach zu trennen, erst bei 83x, dann auch bei 30x, sehr feine Punkte mit sichtbarem Helligkeitsunterschied ../projects/double-stars/sarah-gebauer/sketches/20200415%2090%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (170x) AB: 90 Leonis, a close but easily split pair at 170x, a yellow-white A and a bluish-white B.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: 90 Leo. Blazing white pair, ~1 delta mag, ~3"
STF1555 & HJ503 STF1555 AB 6m.4 6m.8 0.7" 151° 2019 Leo 11h36m17.94s / +27°46'52.70"
HJ503 AB-C 5m.8 11m.2 22.5" 156° 2016

../images/binary-star-orbits/STF1555-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1555 (AB): blickweise gerade eben trennbar ../projects/double-stars/frederik-wanink/sketches/STF1555.jpg
Mark McCarthy
Fremont (California/USA)
317mm (443x) STF1555 (AB): Nice! AB tight hair-split white pair, with fainter & wide separated AB-C in a row to the east.
Mark McCarthy
Fremont (California/USA)
317mm (443x) HJ503 (AB-C): Nice! STF 1555AB tight hair-split white pair, with fainter & wide separated C in a row to the east.
Mark McCarthy
Fremont (California/USA)
508mm (553x) STF1555 (AB): Hairline split at 333x, clear split with 533x, very close ~0.5", bright. Part of plus one
★★ STF1559 6m.8 8m.0 2.0" 326° 2019 UMa 11h38m49.11s / +64°20'49.40"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-04-14: Two clearly visible, slightly touching diffraction disks. The fainter companion appeared somewhat more diffuse. Occasionally the double star appeared separated. ../projects/double-stars/robert-zebahl/sketches/2020-04-14_stf1559.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very striking colors, A is a strong blue-white, and 2 delta mag B is a reddish orange color, about 3" separation, a very great pair!
STF1565 7m.3 8m.4 22.2" 304° 2017 Leo 11h39m36.50s / +18°59'48.30"
Christopher Hay
Seeheim (Germany)
15x60 Well split. Primary warmer in tone, secondary colder. No visual competition whatsoever in 3.3° FOV, making the delicate pair rather charming.
A physical double at the substantial distance to us of 2175 light years.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Moderately bright, clear difference in brightness, attractive separation, striking. The primary component shines in a beautiful yellow with a touch of orange, the tiny companion just greyish.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2021-04-21: At 22x very nicely separated with moderate difference in brightness. White-yellowish & grey-blue. At 44x similar color impression: slightly yellowish & slightly bluish.
Sarah Gebauer
Germany
100mm (45x) weit und deutlich getrennt, die westliche Komponente minimal schwächer als die östliche zu sehen
Uwe Pilz
Leipzig (Germany)
105mm (21x) gelb und rot ../projects/double-stars/uwe-pilz/sketches/210427STF1565.jpg
BU603 AB 6m.0 8m.5 1.0" 329° 2019 Leo 11h48m38.71s / +14°17'03.20"

../images/binary-star-orbits/BU603-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
80mm (150x) Elongated but not split. 129-year period
Uwe Pilz
Leipzig (Germany)
105mm (200x) sehr schwierig ../projects/double-stars/uwe-pilz/sketches/210330BU603.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) nicht getrennt
Mark McCarthy
Fremont (California/USA)
203mm (533x) Suspected at 205x and 333x but needed higher magnification to see it. B is a very small point, with seeing, in the first diffraction ring. ~1" and ~3 delta mag
STF1579, 65 UMa AB-C 6m.7 8m.3 3.9" 43° 2019 UMa 11h55m05.74s / +46°28'36.60"
AB-D 6m.7 7m.0 62.5" 114° 2018
Christopher Hay
Seeheim (Germany)
7x45 AB-D: Handheld. A bit difficult due to hand tremor, but clearly split with definite delta-mag. Nice in 8.6° FOV together with 67 UMa (Forgeren), which for its part has a bluish companion at a separation of about 300".
With 15x45 stabilised binoculars AB-D is an easy wide split, AB warmer, D colder in hue.
A physical pair at a distance to us of 691 light years.
Robert Zebahl
Leipzig (Germany)
8x40 AB-D: 2020-04-05: Immediately conspicuous in the field. Medium bright double star with slightly uneven components. Western component AB appeared slightly orange, component D tended to be bluish.
Robert Zebahl
Leipzig (Germany)
55mm (27x) AB-D: Easy to separate with large distance and very small difference in brightness. The D component showed a bluish tint, the lighter one (AB) a slightly yellowish tint. At higher magnification also the faint C component is visible.
Robert Zebahl
Leipzig (Germany)
55mm (83x) 2019-02-09: AB, C & D easy to split, but the faint C component only appeared as a tiny star. To the south there is the brighter D component. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_65_uma.jpg
Robert Zebahl
Leipzig (Germany)
../projects/double-stars/robert-zebahl/photographs/2020-04-06_65_uma.jpg
STF1600 7m.6 8m.3 7.8" 92° 2016 UMa 12h05m34.42s / +51°55'52.20"
Robert Zebahl
Leipzig (Germany)
70mm (44x) 2020-04-19: Uneven pair. At 22x medium bright and still pretty tight. At 44x beautiful sight: pale orange, grey-bluish.
Sarah Gebauer
Germany
100mm (73x) zweifarbig, bei 73x sauber getrennt, wenn auch nadelfein, die westliche Komponente ist orange, die östliche blau ../projects/double-stars/sarah-gebauer/sketches/STF%201600.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Easy white-yellow Struve, half delta mag, wide
Mark McCarthy
Fremont (California/USA)
317mm (277x) Pretty orange and blue pair, 8-9 mag, 1.5 delta mag, wide separation ~10"
STF1662 7m.8 9m.8 19.2" 242° 2017 UMa 12h35m48.64s / +56°34'42.40"
Sarah Gebauer
Germany
100mm (73x) Teil eines Dreiecks, so schwach, dass man sie kaum sieht ../projects/double-stars/sarah-gebauer/sketches/STF%201662.jpg
★★★ STF1670, gamma Vir, 29 Vir, Porrima AB 3m.5 3m.5 2.5" 2020 Vir 12h41m39.60s / -01°26'57.90"

../images/binary-star-orbits/STF1670-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
15x60 28 February 2021 at 3" separation: Very slight elongation. PA estimated at 5° (thus only 9° off, which seems fairly precise to me considering the low power of 15x and the minimal elongation, both of which make PA estimation difficult).
Intentionally flashed the eyes on the almost full Moon directly prior to observation in order to enhance acuity. Compared the sight of Porrima repeatedly with that of similarly bright Epsilon Vir (Vindemiatrix) to check whether the elongation is perhaps an artefact of the bincolulars or of my eyes, but no elongation seen there.
Robert Zebahl
Leipzig (Germany)
16x70 2021-05-23: Not even close to appear as a double star. The components are just too bright, the separation too small.
Robert Zebahl
Leipzig (Germany)
55mm (56x) 2019-05-18: At 38x slightly elongated. At 56x touching diffraction disks. At 71x clearly separated with very small gap.
Robert Zebahl
Leipzig (Germany)
70mm (44x) 2021-05-26: At full aperture Porrima appears almost separated at 44x. The two diffraction disks are well visible. At 31x it is difficult to see any elongation at all.
At 40mm aperture Porrima can be seen clearly elongated already at 31x, from 67x it appears as an '8'. At only 22x Porrima is not visible as a double star.
Robert Zebahl
Leipzig (Germany)
70mm (104x) 2019-05-04: At 47x clearly visible as '8', at 73x split with almost touching diffraction disks. At 104x clearly separated, equally bright and pretty close together. The gap was smaller than the diameter of the diffraction disk.
Mark McCarthy
Fremont (California/USA)
80mm (92x) Porrima. Nice and easy, yellow-white equal stars. 169-year period
Robert Zebahl
Leipzig (Germany)
102mm (125x) 2019-05-01: Extremely nice double star! Equally bright and relatively close together. Both components appeared yellowish-white.
Uwe Pilz
Leipzig (Germany)
105mm (200x) weiß-weiß, die nördliche Komponente ist eine Winzigkeit heller
Winfried Kräling
Marburg (Germany)
127mm (146x) 21.04.2018: Bei V=100x erscheint dieser orangefarbene Doppelstern bereits als „8“. Bei V=146x ist Porrima voll getrennt. ../projects/double-stars/winfried-kraeling/sketches/180421_03_Gamma%20Vir.jpg
Sarah Gebauer
Germany
150mm (166x) die 2,8'' entfernten Komponenten A und B konnten haarscharf bei 83x und 166x getrennt werden, beide strahlen gleich hell als ganz dichte Glanzpünktchen; Komponenten E und F wurden gesehen, C und D allerdings nicht; bei 83x waren AB ganz knapp nicht mehr voneinander getrennt ../projects/double-stars/sarah-gebauer/sketches/20200416%20Gamma%20Vir%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Porrima. Bright near equal, dull white, well split about 4". Physical with a 169-year period, I missed my chance to witness the rapid periastron a few years ago
Mark McCarthy
Fremont (California/USA)
317mm (170x) Porrima. Very pretty yellow-white, near equal, close split at 170x. Star disks improved with apodizing mask.
STF1685 AB 7m.3 7m.8 16.0" 202° 2018 Com 12h51m54.80s / +19°10'19.90"
René Merting
Drachhausen (Germany)
18x70 ein schicker FG-Doppelstern - ein enges Paar mit der leicht schwächeren Komponente B im Süden - schwacher Farbkontrast, der wieder mal zwischen den Sternen hin und her zu springen scheint
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-04: Lovely sight! Beautifully separated with little difference in brightness. Together with two other brighter stars the double star forms an almost right-angled triangle. At 44x the primary component appears in pale orange, the companion rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2020-04-04_stf1685.jpg
Christopher Hay
Seeheim (Germany)
125mm (64x) Wide split. Component A bluish, B warmer. Well-matched pair.
A physical double at a distance to us of 722 light years.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Brighter white A, 0.5 delta mag B, pretty wide separation.
★★ STF1692, 12 CVn, alpha CVn, Cor Caroli AB 2m.9 5m.5 19.3" 230° 2020 CVn 12h56m01.67s / +38°19'06.20"
Christopher Hay
Seeheim (Germany)
11x80 Difficult, but definitely split. Interesting to compare directly with Zeta UMa (Alcor): the latter very close to separation, but not quite there.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, companion silvery-white.
Christopher Hay
Seeheim (Germany)
76mm (17x) Clearly split. Primary slightly yellowish. Secondary too close to get a clear colour impression, but seems grey-blue in good moments.
Mark McCarthy
Fremont (California/USA)
80mm (92x) Cor Caroli, showpiece, almost three detla mag and nicely split. Nice round star images
René Merting
Drachhausen (Germany)
100mm (32x) bei 64x ein auffälliger Doppelstern - A ist gleißend weiß, B im Südwesten ist 1.5 Größenklassen schwächer (2.67 mag lt. Stelle Doppie, schon zum zweiten Mal vertan hier)
Uwe Pilz
Leipzig (Germany)
105mm (66x) blauweiß-orange, trennbar bei 16x
Uwe Pilz
Leipzig (Germany)
105mm (200x) schon bei 26x getrennt ../projects/double-stars/uwe-pilz/sketches/CorCaroli.jpg
Robert Zebahl
Leipzig (Germany)
114mm (28x) Well split with big difference in brightness.
Sarah Gebauer
Germany
150mm (83x) deutlicher Helligkeitsunterschied, sehr einfach zu trennen ../projects/double-stars/sarah-gebauer/sketches/20200415%20Alpha%20CVn%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Cream white and light canary yellow. Well separated, 2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Cor Caroli: Cream white and light canary yellow. Well separated, 2 delta mag.
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Weiß-leicht bläulich - leicht orange rötlich. Kleiner Helligkeitsunterschied.
Mark McCarthy
Fremont (California/USA)
317mm (71x) Cor Caroli. Cream and bluish, use low power to fit STF 1688 & STF 1702 in the same field
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein schönes Pärchen - A ist weiß - B zeigt sich gut getrennt südwestlich von A, ist gut 1.5 Größenklassen schwächer (2.67 mag laut Stelle Doppie) und mit einem leichten Stich ins gelbliche (warmweiß) - zurück auf 20x eine ungleiche 8, bei 32x knapp getrennt
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201692.png
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Cor%20Caroli.jpg
★★ HU644 AB 9m.1 9m.9 0.1" 354° 2019 CVn 13h19m45.58s / +47°46'41.10"

../images/binary-star-orbits/HU644-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220723_hu644.jpg
Mark McCarthy
Fremont (California/USA)
317mm (443x) Orange-red pair, near equal mag, split with seeing at 443x
Mark McCarthy
Fremont (California/USA)
508mm (533x) Quite perfect star images, light orange stars, nearly 2 delta mag, well separated, PA northwest. Grade 2, physical, 48.776-year period. It has a slightly out of round orbit from our perspective, near it's periastron now and will widen to an easy 1.584" by 2030
STF1740 7m.1 7m.4 25.6" 75° 2018 Vir 13h23m39.16s / +02°43'24.00"
Stefan Loibl
Rosenheim (Germany)
10x50 close double star for binoculars, clearly split, component A slightly reddish
René Merting
Drachhausen (Germany)
18x70 ein auffälliges, schön eng zusammen stehendes Sternpaar - Komponente B im Osten ist nur knapp schwächer
Robert Zebahl
Leipzig (Germany)
70mm (33x) Easy to separate, slightly unequal with moderate angular distance. A: pale orange, B: color not clearly perceptible.
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb und orange, der westliche ist einen Hauch heller. Schon auffallend bei 2x, sehr schön bei 88x ../projects/double-stars/uwe-pilz/sketches/200516STF1740.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) hair split equal white pair. Suspected elongation at 205x but needed 333x to split. 667x too much power given the conditions.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201740.png
★★ STF1744 & SMR4, zeta UMa STF1744, 79 UMa, Mizar AB 2m.2 3m.9 14.7" 154° 2020 UMa 13h23m55.42s / +54°55'31.50"
STF1744, Mizar & Alcor AC 2m.2 4m.0 715.5" 73° 2020
SMR4 AD 2m.2 7m.6 498.1" 103° 2020
Christopher Hay
Seeheim (Germany)
naked eye AC: Mizar/Alcor: After seeing the two stars separated for the first time under clear corona skies in spring 2020, this became a regular and easy sighting. Naked-eye star splitting is a skill that develops rapidly with practice. Mizar and Alcor are wide apart with my 60-year-old eyes, and occasionally Alcor appears slightly bluish.
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Mizar (AB) is an uneven figure-8, the smaller circle of the 8 pointing to an estimated PA of 150°. Without knowing that this is a double star one might think the binoculars have collimation issues, but Epsilon UMa displays a perfect little Airy disk.
Alcor (C) appears bluish, Mizar creamy-white.
D seems reddish.
René Merting
Drachhausen (Germany)
8x30 AC: ein ultraweit getrenntes Pärchen - Komponente C im NO schätze ich eine Größenklasse schwächer ein (1.78 mag laut stelle Doppie)\AD: Komponente D (SMR4) ist östlich der beiden Sterne ganz schwach erkennbar, D steht dabei näher zu C
Robert Zebahl
Leipzig (Germany)
8x40 AB: 2020-04-05: Even with tripod not separable.
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. Touching stars with a sliver of black in-between in good moments. Very aesthetic 6.3° field of view together with a little star group around 82 UMa.
Christopher Hay
Seeheim (Germany)
12x24 AB: On tripod. Very finely split, but stable.
Christopher Hay
Seeheim (Germany)
15x45 AB: Binoculars with internal stabilisation, handheld. AB nicely split with strong difference in magnitudes between A and B, very pretty.
René Merting
Drachhausen (Germany)
15x56 AB: Komponente B ist südöstlich von A erkennbar, der Stern klebt noch an A, deutliche Einschnürung, aber noch keine Trennung\AC: ja, was soll ich sagen, klar sehe ich die beiden Sterne getrennt ;-), manche schaffen das mit bloßem Auge, ich nicht\AD: D ist leicht nach Süden versetzt zwischen A und C erkennbar, die mit Abstand schwächste der vier sichtbaren Komponenten
Christopher Hay
Seeheim (Germany)
42mm (12x) AB: At 6.3x substantially elongated with clear positions of the brighter/darker components. At 10.7x a very stretched figure-eight tantalisingly close to popping apart. At 12x cleanly split with a stable sliver of black between A and B.
Robert Zebahl
Leipzig (Germany)
70mm (10x) AB: 2020-04-12: Observation from city with a 70/400mm ED refractor, for which I made aperture masks from 10mm to 60mm. Goal was to find the minimum magnification for a successful split.

70mm: At 12.5x no separation of the components possible due to outshining. Grey filters brought a slight improvement, but again no separation or elongation was visible.

60mm: At 12.5x slight outshining of the companion, clearly elongated and almost separated.

50mm: At 12.5x the companion was almost outshined. A separation was just possible.

40mm: At 12.5x both components appear finely separated from each other.

30mm: At 10x not clearly separable due to outshining, but clearly elongated. At 12.5x then quite easy to separate with a fine star rendition.

20mm: At 10x the companion is still clearly visible, but quite close to the primary component. At 12.5x best view under the used apertures with a very fine rendition!

10mm: At 10x the companion appears very faint. Separation possible, but extremely tight. At 12.5x reasonably well separated.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-11: At 12x no separation possible, because the bright primary component outshines the companion. At 22x clearly separated, but still quite close together.
Robert Zebahl
Leipzig (Germany)
102mm (28x) First pastel sketch (Pitt pastel by Faber-Castell) of a double star on black paper, where also the halos were sketched around the stars. The stars themselves were redrawn with an Edding (Edding 1500, Soft Pastel white). The sketch shows the components A to D. ../projects/double-stars/robert-zebahl/sketches/2019-08-14_mizar_alcor.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: mit viel Schwarz zwischen den Beugungsscheiben (1“9) ../projects/double-stars/uwe-pilz/sketches/zetaUMa.jpg
Jörg S. Schlimmer
Germany
127mm (87x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Alkor-Mizar_ausschnitt_filtered.jpg
Sarah Gebauer
Germany
150mm (83x) AB: einfacher, aber sehr schöner Doppelstern, Komponenten A und B mit 14,4'' Abstand stehen mit schönen Feldsternen zusammen im Bild ../projects/double-stars/sarah-gebauer/sketches/20200409%20Zeta%20UMa%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
../projects/double-stars/robert-zebahl/photographs/2020-04-06_zeta_uma.jpg
Werner E. Celnik
Rheinberg (Germany)
120mm ../projects/double-stars/werner-celnik/photographs/zetaUMa%202001-07-01%202130UT%20Refr_120-2000%20Fuji100%203s%20A8076%20kl.jpg
STF1757 AB 7m.8 8m.8 1.6" 144° 2019 Vir 13h34m16.38s / -00°18'49.80"

../images/binary-star-orbits/STF1757-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig ../projects/double-stars/uwe-pilz/sketches/200516STF1757.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Close, ~2", a dull orange, ~1.5 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-yellow, half a delta mag, pretty, ~1.5"
25 CVn STF1768 AB 5m.0 7m.0 1.6" 95° 2020 CVn 13h37m27.70s / +36°17'41.40"
STF1768 AC 5m.0 11m.6 214.3" 321° 2015
KZA73 AD 5m.0 13m.0 335.6" 92° 2015
KZA73 AE 5m.0 12m.7 371.6" 139° 2020
KZA73 AF 5m.0 9m.4 437.3" 118° 2015

../images/binary-star-orbits/STF1768-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
60mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 60mm. The diffraction ring of the primary component is virtually invisible. The companion appears only in few moments as an extremely faint, elongated brightening in the diffraction ring. Very difficult. Telescope should be in very good optical condition!
Robert Zebahl
Leipzig (Germany)
70mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 70mm. Companion only visible as a subtle, elongated, not permanently visible brightening. The diffraction ring of the primary component is only visible occasionally. Difficult. Telescope should be in good optical condition!
Robert Zebahl
Leipzig (Germany)
80mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 80mm. Companion permanently visible as elongated brightening in the diffraction ring. But the diffraction ring itself appears rather faint. Moderately difficult.
Robert Zebahl
Leipzig (Germany)
90mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 90mm. Companion quite clearly recognizable as elongated brightening in diffraction ring. Relatively simple.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB: 2020-03-16: The faint companion is immediately recognizable as a distinct, slightly elongated brightening in the diffraction ring. Easy.
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB: 2020-03-19: At 150x the clearly fainter companion is visible as a roundish brightening. Due to the chromatic aberration of the achromat (152mm f/5.9) the companion is almost outshined. At 180x the companion is then well, at 225x and 300x very well visible as a tiny separated star.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very tight pair, a little more than hairline split, ~2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very tight pair, a little more than hairline split, ~2 delta mag. 8" 333x: white and dull blue, ~1", Nice!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/25CVn.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Very pretty pale yellow and orange, 2-3 delta mag, ~2"
★★ STF1777, 84 Vir 5m.5 8m.3 2.7" 227° 2016 Vir 13h43m03.71s / +03°32'16.40"
Uwe Pilz
Leipzig (Germany)
105mm (200x) deutliche Aufhellung im 1. Ring, nicht sonderlich schwierig ../projects/double-stars/uwe-pilz/sketches/200516_84Vir.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light orange and blue-green B, large magnitude difference, ~3". Pretty.
Gerd Kohler
Langenzenn (Germany)
254mm (218x) Blasses rot - eventuell rötlich. Enges Paar. Deutlicher Helligkeitsunterschied.
★★ STF1821, kappa Boo, 17 Boo, Asellus Tertius AB 4m.5 6m.6 13.8" 235° 2019 Boo 14h13m29.00s / +51°47'23.80"

../images/binary-star-orbits/STF1821-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
15x60 On tripod. Fine split. Attractive together with well-split Iota Boo in 3.3° FOV.
Iota, Kappa, Theta were called Aselli by Johannes Bayer in the 17th century, meaning The Donkeys. The group is found easily naked-eye under a 5mag sky. Kappa Boo is Asellus Tertius, The Third Donkey.
A physical double at a distance to us of 163 light years.
René Merting
Drachhausen (Germany)
18x70 Komponente A strahlt so hell, dass B deutlich schwächer ganz knapp im SW von A abgesetzt sichtbar ist - Helligkeitsunterschied schätzungsweise 3 Magnituden (nur 2.09 mag laut Stelle Doppie)
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Clearly separated with significant difference in brightness. The primary component showed a pale yellowish-orange color with a greyish companion. To the southeast there is the double star STFA 26.
Sarah Gebauer
Germany
100mm (73x) sehr schön zusammen mit STFA 26 in einem Gesichtsfeld bei 73x, dabei sehr schön getrennt ../projects/double-stars/sarah-gebauer/sketches/STF1821%20und%20STFA26.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) weiß-grau, trennbar bei 22x
Karsten Kopp
Köln (Germany)
600mm (180x) Im CLT leicht zu trennen. Beider Sterne erscheinen weißlich.
STF1816 7m.4 7m.8 0.4" 100° 2019 Boo 14h13m54.63s / +29°06'19.50"

../images/binary-star-orbits/STF1816-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb ../projects/double-stars/uwe-pilz/sketches/stf1816.jpg
Mark McCarthy
Fremont (California/USA)
178mm (533x) Notched elongation, unequal pair, seeing won't support higher magnification. Physical with 1340-year period, it is near periastron now and will remain there the rest of my lifetime
Mark McCarthy
Fremont (California/USA)
317mm (553x) Rod-shaped equal white. July 2017
STF1829 8m.1 8m.6 5.6" 151° 2019 Boo 14h15m27.95s / +50°26'24.60"
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-21: Clearly elongated, felt almost separated.
Sarah Gebauer
Germany
100mm (73x) nadelfein getrennt, bildet die Ecke des Buchstabens L, das (mit Amiciprisma) auf dem Kopf steht ../projects/double-stars/sarah-gebauer/sketches/STF%201829.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) einfach
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal white wide.
★★ STF1830 & STF1831 STF1831 AB 7m.2 9m.6 5.8" 138° 2017 UMa 14h16m08.47s / +56°42'45.70"
STF1831 AC 7m.2 6m.7 112.2" 219° 2017
STF1831 CD 6m.7 13m.1 112.1" 116° 2016
STF1830 CE 6m.7 9m.3 138.2" 245° 2020
STF1830 EF 9m.3 10m.3 10.6" 312° 2017
STF1830 EG 9m.3 12m.2 35.2" 81° 2017
Christopher Hay
Seeheim (Germany)
7x45 STF1831 (AC): Wide split at 7x but still a very distinct impression of being a double. No colour impression. Two fine pinpricks of light, rather attractive in 8° FOV.
According to Stelledoppie the A-C pair, at 509 light years distance to us, is the only physical pair in the whole STF 1830/1831 complex. A nice physical double for small binoculars.
Robert Zebahl
Leipzig (Germany)
8x40 STF1831 (AC): 2020-04-05: Fairly wide pair with slight differences in brightness and color. C appeared slightly orange, A on the other hand slightly bluish. Comparatively bright double star, which gives a nice view.
René Merting
Drachhausen (Germany)
15x56 AC: beide Sterne sind gleich hell und mehr als komfortabel voneinander getrennt\CE: Komponente E im Südwesten von C fällt ebenfalls sofort ins Auge, wenn auch der Stern deutlich schwächer ist - Abstand zu C in etwa so groß, wie der Abstand AC
Robert Zebahl
Leipzig (Germany)
55mm (27x) STF1831 (AC): 2020-04-05: Moderate difference in brightness. C: pale orange, A: subtle blue.
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-11: At 22x the components AB, C, E & F are well visible and widely separated. E & F are comparatively faint. The C component in the middle appeared white-yellowish, AB rather white with a slight tendency to blue. At 57x, the pair AB with a clear difference in brightness can be easily split. An altogether rewarding and unusual multiple system. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_stf1830_stf1831.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) Komponente G erforderte 200x ../projects/double-stars/uwe-pilz/sketches/200411stf1830.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1831 (AB): One pair close to another, 5" and 2 delta mag. Part of a widely separated equal pair, and a gang of three stars further away -- five additional pairings in the system.
René Merting
Drachhausen (Germany)
320mm (72x) EF: bei 72x ein schwaches Sternpaar, gut getrennt - E ist gelblich, F eine halbe Größenklasse schwächer und grau
EG: bei 72 ist nordöstlich von EF noch ein ganz schwacher Lichtpunkt erkennbar - G hat ungefähr mit dreifachem Abstand EF
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 144x ist B ein bisschen mehr als knapp getrennt im SO von A erkennbar - B ist deutlich schwächer und grau gegen den weißgelblich strahlenden A - zurück auf 72x kann ich die beiden auch noch extrem knapp getrennt erkennen in guten Momenten - ein schönes Doppel zusammen mit STF1830 EF
AC: bei 72x fällt die helle Komponente C im Südwesten von AB zwar auf, ich hätte aber nicht vermutet, dass der Stern dazu gehört
★★ STFA26, iota Boo, 21 Boo AB 4m.8 7m.4 39.0" 33° 2020 Boo 14h16m10.07s / +51°22'01.30"
Robert Zebahl
Leipzig (Germany)
8x40 2020-04-05: Even with tripod the faint companion was not visible.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Well split, companion seems bluish.
Fine 3.3° FOV star field with Kappa Boo (also split) and Theta Boo plus several 6th to 7th mag stars. Iota, Kappa, Theta were called Aselli by Johannes Bayer in the 17th century, meaning The Donkeys. The group is found easily naked-eye under a 5mag sky. Iota Boo is Asellus Secundus, The Second Donkey.
A physical double at a distance to us of 95 light years.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-21: Very beautifully embedded in a group of bright and medium bright stars. Significant difference in brightness. Primary component appeared white-yellowish, the much fainter companion grey-bluish at best.
René Merting
Drachhausen (Germany)
18x70 ein schönes ungleiches Paar, aber Komponente B ist deutlich besser abgesetzt von A erkennbar als beim Nachbar-DS STF1821 - leichter Farbkontrast
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Similar view to the northwest standing kappa Boo. Nicely separated with larger distance and fainter companion. The primary component appeared rather white.
Sarah Gebauer
Germany
100mm (73x) bei 73x weit getrennt mit sichtbarem Helligkeitsunterschied, passt zusammen mit STF1821 in ein Gesichtsfeld und ist sehr schön anzusehen ../projects/double-stars/sarah-gebauer/sketches/STF1821%20und%20STFA26.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr weit, auffallend bei 22x
STT281 7m.7 9m.7 1.5" 166° 2017 Boo 14h20m20.85s / +08°34'56.30"
Uwe Pilz
Leipzig (Germany)
105mm (200x) der Begleiter ist schwach und schwierig ../projects/double-stars/uwe-pilz/sketches/191129stf281.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very fine, but well split, huge delta mag, surprise!
STF1850 7m.1 7m.6 25.2" 263° 2018 Boo 14h28m33.29s / +28°17'25.90"
Robert Zebahl
Leipzig (Germany)
8x40 2020-04-05: Separated, but still quite close together with a moderate difference in brightness.
Christopher Hay
Seeheim (Germany)
15x45 Handheld, binoculars with internal stabilisation. A tight pair, indirect vision helps to see black in-between. Eastern component clearly brighter. Nice in 4.5° FOV with Rho and Sigma Boo.
A physical double at a distance to us of 1140 light years.
René Merting
Drachhausen (Germany)
16x70 ein gut getrenntes Paar zweier gleich heller Sterne - beide weiß
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Easily separated, medium bright with rather small difference in brightness and moderate distance. Fairly conspicuous. The components appeared white-yellowish and white-bluish. Beautiful double star.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x locker getrennt - Komponente B ist vielleicht eine halbe Magnitude schwächer als A und strahlt ein wenig dumpfer bzw. weniger weiß
Uwe Pilz
Leipzig (Germany)
120mm (72x) recht weit, schöner Farbkontrast ../projects/double-stars/uwe-pilz/sketches/210522stf1850.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Near equal white wide. WDS claims physical, and their parallax do overlap, however they are separated by 7168 AU, too far than the known 5000 AU limit of known orbital pairs
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201850.jpg
STF1863 7m.7 7m.8 0.6" 63° 2018 Boo 14h38m00.71s / +51°34'42.10"

../images/binary-star-orbits/STF1863-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (280x) 2021-05-16: The double star appeared elongated with an estimated position angle of 60°.
Christopher Hay
Seeheim (Germany)
180mm (200x) 30 May 2021, current separation 0.65” according to Stelledoppie. No prior PA knowledge nor knowledge of relative brightnesses.
Constant elongation seen. Definite determination of position of the primary within the elongation, more definite than the relative brightnesses (consulted after observation) would have led me to expect. PA estimated at 60°.
In good moments fragments of a pear-shaped first diffraction ring surround the system, particularly on the side of the primary. An interesting and attractive sight.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gerade trennbar ../projects/double-stars/frederik-wanink/sketches/STF1863.jpg
★★ zeta Boo STF1865 AB 4m.5 4m.5 0.2" 278° 2020 Boo 14h41m08.92s / +13°43'42.00"
H6 104 AB-C 4m.5 11m.0 104.3" 259° 2020

../images/binary-star-orbits/STF1865-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) AB-C ../projects/double-stars/uwe-pilz/sketches/zetaBoo.jpg
Uwe Pilz
Leipzig (Germany)
120mm (250x) AB ../projects/double-stars/uwe-pilz/sketches/220604ZetaBoo.jpg
Mark McCarthy
Fremont (California/USA)
508mm (1067x) AB: Zeta Boo. Short period. First impression was moderately well notched overlapping disks (eg. not barely notched, but not strongly notched either). With more time observing & getting used to the image, and in moments of better seeing, the notch became more distinct. It would not separate in spite of moments of better seeing. I could also see the elongation, but only subtly notched due to the smaller scale, at 667x
STF1878, DL Dra 6m.3 9m.2 4.2" 314° 2019 Dra 14h42m03.25s / +61°15'42.90"

../images/binary-star-orbits/STF1878-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) starke Aufhellung im ersten Ring ../projects/double-stars/uwe-pilz/sketches/stf1878.jpg
★★ STF1877, epsilon Boo, Izar AB 2m.6 4m.8 2.9" 347° 2020 Boo 14h44m59.14s / +27°04'29.90"
Robert Zebahl
Leipzig (Germany)
55mm (125x) The fainter component was seen as permanent brightening on the first diffraction ring of the primary component.
Robert Zebahl
Leipzig (Germany)
60mm (192x) Easy to split, whereby the much fainter component lies on the first diffraction ring of the primary component. The primary component itself appeared slightly yellowish. ../projects/double-stars/robert-zebahl/sketches/2018-04-10_epsilon_boo.jpg
Robert Zebahl
Leipzig (Germany)
70mm (133x) Easy to split, very unequal. A appeared in pale orange, B was visible as a very tiny, grey star on the first diffraction ring of component A.
Christopher Hay
Seeheim (Germany)
76mm (100x) AB: Secondary sits on the first diffraction ring of the primary, and appears there as a fine blue point. Further magnification not useful, merely darkens the image.
Mark McCarthy
Fremont (California/USA)
80mm (150x) Izar: Dull yellow-orange A and dull orange B, nice round images so split easily. No parallax for the B star, so it's uncertain if physical
René Merting
Drachhausen (Germany)
100mm (142x) bei 107x erscheint die B-Komponente nordwestlich leicht angesetzt an der gelblich strahlenden Komponente A - bei 142x dann ist die Trennung komplett, B liegt schön auf einem abgesetzten Beugungskranz von Komponente A
Stefan Loibl
Rosenheim (Germany)
102mm (205x) nice contrast yellow-orange/blue
Robert Zebahl
Leipzig (Germany)
102mm (224x) 2021-05-12: Primary component appears in bright orange, the well separated, much fainter companion at 187x grey-bluish, at 224x and higher in a very nice, pale blue.
Uwe Pilz
Leipzig (Germany)
120mm (150x) Orange und blau, sehr lohnend ../projects/double-stars/uwe-pilz/sketches/210522EpsBoo.jpg
Robert Zebahl
Leipzig (Germany)
120mm (192x) At 85x the fainter component was easily visible but not separated. At 192x well split. The fainter component was almost on the first diffraction ring of the primary component. Quite big difference in brightness. I did not looked at the color of the components.
Sarah Gebauer
Germany
150mm (166x) weder mit 166x noch mit 250x im April 2020 getrennt
Gerd Kohler
Langenzenn (Germany)
254mm (346x) Gelblich - leicht bläulich. Enges Paar. Deutlicher Helligkeitsunterschied.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) deutl. Farbkontrast blau gelb ../projects/double-stars/frederik-wanink/sketches/Izar.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Izar: Yellow-orange and blue, very pretty, as always
Karsten Kopp
Köln (Germany)
600mm (257x) Sehr einfaches und auffälliges Objekt. Dieser Doppelstern war für mich an diesem Abend das Highlight. Vor allem, weil der schwächere hellblaue Stern gerade knapp neben den Spikes des helleren gelben Sterns steht. ../projects/double-stars/karsten-kopp/sketches/STF1877.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm magnificent DS ../projects/double-stars/berthold-fuchs/photographs/eps%20Bootis.png
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Izar.jpg
STF1881 6m.7 8m.8 3.5" 2017 Vir 14h47m05.35s / +00°58'15.20"
Uwe Pilz
Leipzig (Germany)
70mm (198x) sehr schwierig, einfach mit 105mm ../projects/double-stars/uwe-pilz/sketches/stf1881.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Blue-white and 3-4 delta mag fainter B star, dull blue color. Well separated.
STF1884 6m.6 7m.5 2.3" 55° 2020 Boo 14h48m23.37s / +24°22'01.00"

../images/binary-star-orbits/STF1884-orbit.jpg

Mark McCarthy
Fremont (California/USA)
80mm (94x) Extremely fine, 1 delta mag, notched, to overlapping disks at best moments. Physical with a 1398.2859-year period, it has a nearly edge-on orbit and is currently at the shorter of the two furthest reaches of its orbit
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist der Doppelstern als 8 erkennbar, 107x reicht dann für die knappe Trennung - die B-Komponente im NO ist nur unwesentlich schwächer - ein sehenswertes Pärchen
Robert Zebahl
Leipzig (Germany)
102mm (86x) At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Prototypical pair, >1 delta mag, ~3" separation, white to off white color
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach ../projects/double-stars/frederik-wanink/sketches/STF1884.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gerade so getrennt werden. Beide Sternen leuchten weißlich.
BU106, mu Lib, 7 Lib AB 5m.6 6m.6 1.9" 2019 Lib 14h49m19.09s / -14°08'56.30"
AC 5m.6 14m.7 12.9" 294° 2000
AD 5m.6 14m.1 25.7" 168° 2000
AE 5m.6 12m.6 26.6" 232° 2015

../images/binary-star-orbits/BU106-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Close, 1.5-2", half to one delta mag, off-white stars.
Gerd Kohler
Langenzenn (Germany)
254mm (346x) AB: Bläulich-weiß - bläulich-weiß. A und B haben nur einen geringen Helligkeitsunterschied.
Gerd Kohler
Langenzenn (Germany)
254mm (346x) AE: Bläulich-weiß - weiß. Stern E ist sehr schwach.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt, schwierig wegen Südlage ../projects/double-stars/frederik-wanink/sketches/MuLib.jpg
STF1890, 39 Boo 6m.3 6m.7 2.6" 46° 2020 Boo 14h49m41.37s / +48°43'15.60"

../images/binary-star-orbits/STF1890-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (67x) 2020-04-01: At 44x elongated, partly notched. At 67x split, but very tight. A difference in brightness was not seen. At 133x clearly separated with little difference in brightness. A appeared pale yellow, B rather warm-white.
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-18: At 57x very finely separated with extremely tightly spaced components that appeared equally bright. At 100x a very nice pair with little difference in brightness. Fantastic sight! The color of the components was slightly different: creamy-white & a touch of yellow-orange.
Robert Zebahl
Leipzig (Germany)
102mm (187x) 2021-05-16: Easy. Beautiful double star with slight difference in brightness. Yellowish & rather white. I estimated the position angle to 40°.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell ../projects/double-stars/frederik-wanink/sketches/39Boo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright white pair, well split
STF1885 8m.8 9m.1 4.1" 146° 2017 Vir 14h50m33.12s / -00°01'26.80"
Uwe Pilz
Leipzig (Germany)
120mm (128x) gelb und lila ../projects/double-stars/uwe-pilz/sketches/210522stf1884.jpg
xi Boo, 37 Boo STF1888 AB 4m.8 7m.0 5.2" 297° 2020 Boo 14h51m23.38s / +19°06'01.70"
STF1888 AC 4m.8 13m.8 71.3" 340° 2015
STF1888 AD 4m.8 11m.7 160.8" 286° 2015
ARN11 AE 4m.8 8m.7 271.5" 98° 2015
ARN11 AF 4m.8 9m.2 335.4" 39° 2020
STF1888 BC 7m.0 13m.8 63.9" 340° 2001
STF1888 BE 7m.0 8m.7 273.5" 102° 2009

../images/binary-star-orbits/STF1888-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: 2020-04-24: Beautifully separated with quite a large difference in brightness in a lovely star field. The primary component shines yellowish with a faint companion.
Mark McCarthy
Fremont (California/USA)
80mm (94x) AB: Yellow A and orange B, 2 delta mag, nice. Only 22 light years distant, it is physical with a 298-year period, and will tighten the next 30 years
Sarah Gebauer
Germany
150mm (83x) AB: die 6'' entfernten Komponenten A und B konnten mühelos bei 83x getrennt werden, Komponente E war zu sehen, C, D und F waren nicht sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200416%20Xi%20Boo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Xi Boo. Short period. Richly colored yellow and orange stars, ~1 delta mag, ~5" separation, with several other stars in view. Very pretty
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Ein recht schöner Doppelstern, wobei neben dem Helligkeitsunterschied von 2,2 mag auch die Sternfarben ein schönes Gesamtbild geben. Der hellere Stern erstrahlt gelblich weiß und der schwächere orangegelb.
Hier handelt es sich auch um ein recht nahes System mit 21,9 Lichtjahren Entfernung.
../projects/double-stars/karsten-kopp/sketches/STF1888.jpg
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/Xi%20Bootis.jpg
STT288 6m.9 7m.5 1.1" 160° 2019 Boo 14h53m23.35s / +15°42'18.30"

../images/binary-star-orbits/STT288-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Consistent split, better with seeing, ~1 delta mag, ~1" separation, blue-white stars
Frederik Wanink
Itterbeck (Germany)
254mm (640x) rel. einfach ../projects/double-stars/frederik-wanink/sketches/STT288.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Notched / figure 8 with 277x, split with 553x.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Needed 553x to separate, resolved with the seeing. Near equal yellow-white, ~1" or less.
STF1909, 44 Boo 5m.2 6m.1 0.2" 138° 2020 Boo 15h03m47.30s / +47°39'14.60"

../images/binary-star-orbits/STF1909-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) 2015 getrennt zu sehen (1") ../projects/double-stars/frederik-wanink/sketches/44Boo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) I Boo. Figure 8 to hair split, ~0.9". This pair shrinking separation fast, will be <0.5" in a couple of years. Only 40 LY away. (July 2017)
STF1932 AB 7m.3 7m.4 1.6" 267° 2019 CrB 15h18m20.19s / +26°50'24.70"

../images/binary-star-orbits/STF1932-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell, getrennt ../projects/double-stars/frederik-wanink/sketches/STF1932.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal yellow-white, very close but clean split, ~1.5". Nice!
BU32, 6 Ser AB 5m.5 8m.8 3.4" 23° 2019 Ser 15h21m02.00s / +00°42'55.20"
Robert Zebahl
Leipzig (Germany)
102mm (224x) Not split. Tried at 224x and 280x. Companion probably too faint. I had sidewalk lighting in the immediate vicinity.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Der Begleiter ist sehr schwach. Auch mit 90 mm Blende noch gesehen ../projects/double-stars/uwe-pilz/sketches/190628_6Ser.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Bright yellow A and faint B hangs there outside the diffraction, around 3". WDS says physical and it probably is: 41% parallax range overlap, 253 AU separation
STF1937, eta CrB AB 5m.6 6m.0 0.4" 287° 2020 CrB 15h23m12.23s / +30°17'17.70"
Uwe Pilz
Leipzig (Germany)
120mm (250x) Schwierig ../projects/double-stars/uwe-pilz/sketches/220604EtaCrB.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) 8" 333x Suspect elongation. 8" 667x definite egg shape. 20" 667x Can't get a good focus.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) deutlich als 8 zu sehen, 2015 0,6" ../projects/double-stars/frederik-wanink/sketches/EtaCrB.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Close orange pair, equal mag, snowman shape
Mark McCarthy
Fremont (California/USA)
317mm (553x) Overlapping / notched orange-yellow stars. Used apodising mask.
★★★ mu Boo, 51 Boo, Alkalurops CHR181, mu 1 Boo Aa-Ab 4m.3 0.1" 188° 2012 Boo 15h24m29.54s / +37°22'37.10"
STFA28, mu 1 Boo AB 4m.3 7m.1 109.2" 171° 2020
STF1938, mu 2 Boo Ba-Bb 7m.1 7m.6 2.2" 2020

../images/binary-star-orbits/CHR181-Aa-Ab-orbit.jpg ../images/binary-star-orbits/STF1938-Ba-Bb-orbit.jpg

Christopher Hay
Seeheim (Germany)
7x45 STFA28 (AB): Handheld. Wide split. A compact uneven pair. Component A is bluish-white.
Rather charming in 8.6° FOV with Nu1/2 Boo, which has a gorgeous colour contrast, golden-orange and ice-blue, making it one of the strongest colour-contrast pairs in the sky for binoculars and greatly accentuating the sight of Mu Boo.
In 15x45 binoculars STFA28 AB is very wide, component A bluish-white, B warmer.
Robert Zebahl
Leipzig (Germany)
8x40 STFA28 (AB): Easily split with obvious difference in brightness.
Robert Zebahl
Leipzig (Germany)
16x70 STFA28 (AB): 2021-06-14: Wide, relatively striking pair. Pale yellow & dark orange.
René Merting
Drachhausen (Germany)
16x70 STFA28 (AB): weit getrenntes Pärchen, aufgrund der großen Helligkeitsunterschiedes schöner Farbkontrast - Komponente A im Norden gelblich, B im Süden mehr grau-braun
Robert Zebahl
Leipzig (Germany)
70mm (22x) STFA28 (AB): Evident, very wide apart and unequal. A: white-yellowish, B: grey.
Mark McCarthy
Fremont (California/USA)
80mm (94x) STFA28 (AB): Alkalurops Bright yellow-white A and bluish B, which is itself a slightly unequal close double, finely split (STF 1938 Ba,Bb) -- 256.5-year period, now coming off apastron
Robert Zebahl
Leipzig (Germany)
102mm (125x) Beautiful view! This triple system includes STFA 28 and STF 1938. ../projects/double-stars/robert-zebahl/sketches/2019-04-04_mu_boo.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) ein heller 4m und zwei nahe dunkle 7m, lohnend.
Robert Zebahl
Leipzig (Germany)
120mm (23x) STFA28 (AB): Easy to split with large angular distance and noticeable difference in brightness.
Sarah Gebauer
Germany
150mm (125x) A-BC mit 109'' sind bei 125x sehr weit getrennt, es ist der Ansatz eines engen Doppelsterns zu erkennen, der sich mit 2,2'' Abstand auch bis 250x nicht auftrennen ließ
Christopher Hay
Seeheim (Germany)
180mm (105x) STF1938 (Ba-Bb): At 105x in poor seeing a kissing, evenly matched pair. At 180x clearly split despite the poor seeing, southern component (Ba) seems slightly brighter than Bb.
Mark McCarthy
Fremont (California/USA)
203mm (205x) STFA28 (AB): Bright A star does not seem round. The B star is a tight equal pair, pretty set. [Aa,Ab is CHR 181 0.1", and I'd be shocked if I actually detected it. STFA 28 is technically the bright star and the tight pair, the tight pair is Ba,Bb = STF 1938, 7.09/7.63, 2.2"]
Mark McCarthy
Fremont (California/USA)
203mm (205x) STFA28 (AB): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy
Fremont (California/USA)
203mm (205x) CHR181 (Aa-Ab): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy
Fremont (California/USA)
203mm (205x) STF1938 (Ba-Bb): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1938 (Ba-Bb): 3er System, schön ../projects/double-stars/frederik-wanink/sketches/STF1938.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) STFA28 (AB): Bright white star with tight yellow pair STF 1938 as its companion.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STFA28 (AB): Striking. Bright star with near equal double STF 1938 paired with it. A star is a spectroscopic binary
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1938 (Ba-Bb): Near equal close but well split double also paired with STFA28
Karsten Kopp
Köln (Germany)
600mm (257x) Hier handelt es sich um ein Dreifachsternsystem, welches jetzt aber nicht durch eine besondere Färbung der Sterne auffällt. Die A - B/C Komponenten stehen noch sehr weit auseinander, wobei auch die A-Komponente um einiges heller erscheint. Die beiden Komponenten B/C sind wesentlich näher beieinander und unterscheiden sich auch kaum in ihrer Helligkeit. ../projects/double-stars/karsten-kopp/sketches/mu%20Boo.jpg
HU149 7m.5 7m.6 0.7" 272° 2017 Dra 15h24m35.30s / +54°12'46.10"

../images/binary-star-orbits/HU149-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) mit Zwischenraum zu sehen ../projects/double-stars/frederik-wanink/sketches/HU149.jpg
COU610, 4 CrB, theta CrB 4m.3 6m.3 0.8" 198° 2016 CrB 15h32m55.78s / +31°21'32.90"
Uwe Pilz
Leipzig (Germany)
120mm (250x) blau; gerade eben länglich, PW richtig. Richtung des schwächeren Sterns war erkennbar. ../projects/double-stars/uwe-pilz/sketches/210725thetaCrB.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) 2021-07-23: Theta CrB was only a few degrees above the house roof and the refractor was insufficiently cooled down. In no way visible as a double star. I used magnifications from 200x to 400x.
Mark McCarthy
Fremont (California/USA)
203mm (667x) Notched/snowman at best moments. B definitely fainter and almost blue. Very faintly split, looks like a blue appendage.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Mark McCarthy
Fremont (California/USA)
317mm (738x) Tried pretty hard at 553x with apodizing screen, but dances too much. Used 6mm ortho with barlow, 738x, and at best moment it is olive shaped, but marginal. Observation August 2018
Mark McCarthy
Fremont (California/USA)
762mm (915x) The CrB: Fractured and dancing seeing. 915x, at full aperture and with 8-inch aperture mask, I see a slight out of roundness.
STF1954, delta Ser, 13 Ser AB 4m.2 5m.2 4.0" 171° 2020 Ser 15h34m48.14s / +10°32'20.00"
AC 4m.2 13m.9 66.6" 18° 2014
CD 13m.9 14m.6 4.0" 341° 2018

../images/binary-star-orbits/STF1954-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: Easy to separate with relatively close components and a clear difference in brightness. A appeared rather white, B slightly orange.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 142x zwei gut getrennte reinweiße Komponenten - B wirkt eine halbe Größenklasse schwächer - zurück auf 107x ist die Trennung ebenfalls einfach - zurück auf 64x ist es eine 8 mit tiefen Einschnürungen, kurz vor der Trennung
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: sparse field
Sarah Gebauer
Germany
150mm (85x) AB: Mit 85x schon schön getrennt, ein leichter Größenunterschied der Sterne zu erkennen, einige schwache Feldsterne im Okular bei 0,95° Gf. ../projects/double-stars/sarah-gebauer/sketches/20200422%20Delta%20Ser%20DSk.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt, Del Ser ../projects/double-stars/frederik-wanink/sketches/STF1954.jpg
STF1965, zeta CrB, zeta 1/2 CrB 5m.0 5m.9 6.3" 306° 2019 CrB 15h39m22.68s / +36°38'09.00"
Robert Zebahl
Leipzig (Germany)
16x70 2021-06-14: A slight elongation can be guessed at best.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein knapp getrenntes deutlich helleres Pärchen als der 27' südwestlich stehende Doppelstern STF1964 - Komponente B ist gut eine Größenklasse schwächer als A - beide Komponenten schmiegen sich meist noch aneinander, aber in guten Momenten sind beide getrennt sichtbar - zurück auf 20x ist ein länglicher Stern erkennbar
Robert Zebahl
Leipzig (Germany)
102mm (28x) At 28x very tight and barely split, unequal. At 86x very nice view. No difference in color: both components appeared white.
Stefan Loibl
Rosenheim (Germany)
102mm (68x) Elongated at 28x, split with 68x. Component A blue, B reddish. At 68x double star STF1964 in the same FOV ../projects/double-stars/stefan-loibl/sketches/ZetaCrB_20200601.jpg
Robert Zebahl
Leipzig (Germany)
120mm (48x) Very nice double star, well split with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white, well separated, ~1 delta mag.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gut getrennt werden. Der Helligkeitsunterschied ist nicht sehr groß und der etwas hellere Stern erscheint weißlich und der schwächere geht eher ins bläulich weiße.
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Zeta%20CrB.jpg
STF1989, pi UMi 7m.3 8m.2 0.7" 23° 2013 UMi 15h39m38.61s / +79°58'59.60"

../images/binary-star-orbits/STF1989-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) blickweise als 8 zu sehen, schwierig ../projects/double-stars/frederik-wanink/sketches/pi2Umi.jpg
BU619 AB 7m.0 7m.9 0.7" 357° 2019 Ser 15h43m10.53s / +13°40'03.70"
Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220727BU619.jpg
STF1970, beta Ser, 28 Ser AB 3m.7 10m.0 29.9" 263° 2020 Ser 15h46m11.21s / +15°25'18.90"
AC 3m.6 11m.0 201.7" 211° 2015
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 64x ist B extrem schwach, aber gut abgesetzt westlich vom gleißend hellen A erkennbar - zurück auf 32x ist B auch gerade so erkennbar, noch immer gut von A getrennt
Uwe Pilz
Leipzig (Germany)
120mm (162x) AB ../projects/double-stars/uwe-pilz/sketches/220727BetaSer.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Very wide separation, white A and bluish B. B looks like a planet reflecting A's light. 5 delta mag.
★★ STF1973 7m.6 8m.8 30.6" 321° 2021 CrB 15h46m24.50s / +36°26'45.60"
René Merting
Drachhausen (Germany)
18x70 ein gut getrenntes Sternpaar - Komponente A im Südosten ist doppelt so hell wie B - ganz leichter Farbkontrast
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x sind beide Sterne gut getrennt erkennbar - schöner Farbkontrast zwischen beiden ungleich hellen Sternen
Uwe Pilz
Leipzig (Germany)
105mm (53x) blaugrün-orange, trennbar bei 15x ../projects/double-stars/uwe-pilz/sketches/stf1973.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) Nice double star, easy to split with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide, 1 delta magnitude white.
H3 7, beta Sco AC 2m.6 4m.5 13.4" 20° 2019 Sco 16h05m26.23s / -19°48'19.40"
Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. Difficult handheld in this instrument, but clearly split and attractive as such. Tripod mounting would surely help and make the difference for a nice pair for this magnification. One of the earliest doubles split, found by Benedetto Castelli in 1627, but according to Stelledoppie not a physical double (in contrast to the very tight BU 947 AB pair in the system, which is physical, with a separation of 0.3” in 2020 and 0.4” in 2030 – and the wide PWL 9001 AD pair with a separation of 518” – A, B and D are thus a physical triple). “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 3 in the name means that it is a double star of the 3rd Class [separation 5'' - 15''] in Herschel’s system.
Sarah Gebauer
Germany
150mm (85x) unspektakulär, mit 85x einfach zu trennen, wenige Feldsterne ../projects/double-stars/sarah-gebauer/sketches/20200717%20Beta%20Sco%20DSk.jpg
★★ STF2054 AB 6m.2 7m.1 1.0" 350° 2018 Dra 16h23m47.19s / +61°41'47.00"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Not split in any way.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Immediately visible as a double star. The diffraction disks overlapped slightly. The difference in brightness was clearly visible. Together with the nearby double star eta Dra in the same field of view, the sight was highly fascinating, as both double stars are very different in their appearance. ../projects/double-stars/robert-zebahl/sketches/2019-06-25_stf2054.jpg
Uwe Pilz
Leipzig (Germany)
105mm (198x) verformte Beugungsscheibe, auf den ersten Blick erkennbar ../projects/double-stars/uwe-pilz/sketches/stf2054.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt
★★ STT312, eta Dra, 14 Dra AB 2m.8 8m.2 4.7" 142° 2016 Dra 16h23m59.51s / +61°30'50.70"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Not split in any way.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Easy. Very large difference in brightness. The faint companion appeared as a tiny star outside the first diffraction ring of the primary component. Highly recommended, especially with the nearby double star STF 2054! ../projects/double-stars/robert-zebahl/sketches/2019-06-25_eta_dra.jpg
lambda Oph, 10 Oph, STF2055, Marfic AB 4m.2 5m.2 1.4" 44° 2019 Oph 16h30m54.84s / +01°59'02.80"

../images/binary-star-orbits/STF2055-AB-orbit.jpg

Stefan Loibl
Rosenheim (Germany)
102mm (205x) components cannot be split at 205x
Uwe Pilz
Leipzig (Germany)
105mm (288x) schöner Farbkontrast, lohnend. ../projects/double-stars/uwe-pilz/sketches/190721LambdaOph.jpg
Sarah Gebauer
Germany
150mm (160x) habe den Doppelstern zwar gefunden und konnte auch erkennen, dass es zwei Sterne sind, eine Trennung war aber heute Abend nicht möglich
Mark McCarthy
Fremont (California/USA)
203mm (205x) Marfic. Nice blazing white pair, ~1 delta, ~2". 129 year period, but not much change in the next few years
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/Marfic.jpg
STT313 8m.0 8m.3 0.9" 128° 2018 Her 16h32m33.19s / +40°06'47.70"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) mit Zwischenraum zu sehen ../projects/double-stars/frederik-wanink/sketches/STT313.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Clean split, near equal pair. Nice
★★★ 16/17 Dra STFA30, 16/17 Dra AC 5m.4 5m.5 90.2" 193° 2018 Dra 16h36m13.72s / +52°55'27.80"
STF2078, 17 Dra AB 5m.4 6m.4 3.2" 104° 2020
Christopher Hay
Seeheim (Germany)
3x63 Clean split. Separation is much clearer than that of Nu1/2 Dra (STFA35), which is also in 14° FOV and is hair-fine split.
A physical double at a distance to us of 412 light years.
Christopher Hay
Seeheim (Germany)
7x45 A well split and nicely compact pair. When 16/17 Dra is put at the edge of the 8.6° field of view, Nu1/2 Dra stands at the opposite edge. Their comparison thus suggests itself. 16/17 is somewhat wider than Nu1/2. While the components of Nu1/2 are of equal brightness and whiteness, those of 16/17 display a slight difference in both brightness and colour. 17 (A) first seems bluer than 16 (C), but after 20 seconds this impression flips to C and from then on goes back and forth.
Robert Zebahl
Leipzig (Germany)
55mm (27x) STFA30 (AC): Rather wide pair with almost equal components. C component appeared slightly yellowish-orange.
Robert Zebahl
Leipzig (Germany)
55mm (71x) Grand sight! ../projects/double-stars/robert-zebahl/sketches/2019-05-18_16_17_dra.jpg
Christopher Hay
Seeheim (Germany)
80mm (30x) 16 Dra seems more bluish than 17 Dra, the latter seems slightly yellow in comparison and is distinctly elongated. At 84x 17 Dra is cleanly split and such a delightful view together with 16 Dra that I had no desire to ramp up the magnification. All three stars belong to a physical system.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x noch ein Stäbchen, bei 107x ist B dann knapp getrennt östlich von A erkennbar - B ist auch noch relativ hell bzw. maximal eine Magnitude schwächer
AC: bei 32x weit auseinander stehend - Komponente C im Süden ist maximal eine viertel Magnitude schwächer - leichter Farbkontrast, A weißgelb und C kühlweiß
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF2078 (AB): sehr schönes Dreiersystem ../projects/double-stars/frederik-wanink/sketches/17Dra.jpg
STF2084, zeta Her, 40 Her 3m.0 5m.4 1.6" 110° 2019 Her 16h41m17.16s / +31°36'09.80"

../images/binary-star-orbits/STF2084-orbit.jpg

Sarah Gebauer
Germany
100mm (136x) auf Anhieb ganz haarscharf getrennt, aber leider nur wenige Sekunden haltbar; dennoch erfolgreiche Trennung!
Robert Zebahl
Leipzig (Germany)
102mm (224x) Faint companion as distinct brightening on the first diffraction ring visible. In steadier moments visible as small, round condensation. ../projects/double-stars/robert-zebahl/sketches/2019-06-30_zeta_her.jpg
Robert Zebahl
Leipzig (Germany)
102mm (280x) After a longer, concentrated observation, a permanent brightening of the first diffraction ring of the primary component could be seen at the correct position angle. The brightening appeared only arch-shaped without any noticeable condensation. ../projects/double-stars/robert-zebahl/sketches/2019-06-25_zeta_her.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) äußerst schwierig
Uwe Pilz
Leipzig (Germany)
105mm (288x) Bei sehr ruhiger Luft ohne Probleme sichtbar, trotz der störenden Restkoma meines Refraktors ../projects/double-stars/uwe-pilz/sketches/190721ZetHer.jpg
Mark McCarthy
Fremont (California/USA)
152mm (285x) Zeta Her. A lot of diffraction but there is a persistent bulge, brightening to a split, at the first diffraction ring. Suspected at 175x
Mark McCarthy
Fremont (California/USA)
203mm (533x) Zeta Her. B was seen, not too difficult as a disk within the diffraction of bright A, just outside first ring so ~1.5", like a diamond ring, significant mag difference
Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2084.jpg
René Merting
Drachhausen (Germany)
320mm (320x) in der Nacht konnte ich nur bis 320x gewinnbringend vergrößern - Komponente A zeigt schöne Beugungsscheibchen, B offenbarte sich mir nicht
STF2098 AB 8m.8 9m.6 14.2" 145° 2017 Her 16h45m43.47s / +30°00'17.20"
AC 8m.8 8m.8 65.6" 128° 2017
AD 8m.8 11m.0 67.6" 18° 2015
DE 11m.0 13m.7 5.8" 268° 2015
Robert Zebahl
Leipzig (Germany)
102mm (86x) Already at 28x the components A, B and C were noticeable at first view. At 86x, component D could also be observed very well. The components are all comparatively far apart. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_stf2098.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 4 stars in an arc. Assume AB is the closer pair ~1 delta mag. All wide. (5 stars in 5 pairings)
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: AB, AC, AD, four star system all within a mag of each other, forming a gentle arc. (Actually 5 stars, I missed DE which is 13th mag. Says it's physical -- all 5 are?)
John Raymond
Richmond (Virginia/USA)
Taken in 2017 with 18” Dobsonian. Single images with Canon M3 camera, <30s ../projects/double-stars/john-raymond/photographs/stf2098.jpg
STF2096, 19 Oph AB 6m.1 9m.7 23.9" 88° 2019 Oph 16h47m09.76s / +02°03'52.40"
AC 6m.1 11m.4 214.3" 193° 2020
René Merting
Drachhausen (Germany)
15x56 AB: ein sehr ungleiches Paar - das Strahlen von A lässt den Abstand zu B kleiner wirken als es die Trennungsdaten hergeben - mindestens 2.3 bis 3 Größenklassen Helligkeitsunterschied - es gibt schönere Fernglas-Doppelsterne
Uwe Pilz
Leipzig (Germany)
16x70 AB: äußerst schwierig; sehenswertes Sternfeld ../projects/double-stars/uwe-pilz/sketches/200725_19Oph.jpg
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x ein knapp getrenntes Pärchen, Komponente B ist sehr schwach - bei 32x dann deutliche Trennung und ästhetischerer Anblick - der Helligkeitsunterschied zwischen den Komponenten ist enorm, sicherlich mehr als 3 Magnituden
Uwe Pilz
Leipzig (Germany)
105mm (200x) Hauptkomponente gelb-orange ../projects/double-stars/uwe-pilz/sketches/190721_19Oph.jpg
★★ 52 Her A1866 BC 9m.5 9m.6 0.3" 267° 2013 Her 16h49m14.20s / +45°59'00.40"
BU627 A-BC 4m.8 8m.4 2.2" 44° 2018

../images/binary-star-orbits/A1866-BC-orbit.jpg ../images/binary-star-orbits/BU627-A-BC-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (142x) BU627 (A-BC): bis 142x probiert, hat nicht funktioniert - der Helligkeitsunterschied ist vermutlich zu groß und das Beugungsscheibchen von A so hell wie BC selbst
Robert Zebahl
Leipzig (Germany)
102mm (280x) BU627 (A-BC): At 160x the faint component is already beginning to be visible as brightening in the first diffraction ring. At 280x the brightening is quite clearly visible and appears partly clear as a small knot in the first diffraction ring.
Uwe Pilz
Leipzig (Germany)
105mm (288x) BU627 (A-BC) ../projects/double-stars/uwe-pilz/sketches/52Her.jpg
Uwe Pilz
Leipzig (Germany)
120mm (180x) BU627 (A-BC) ../projects/double-stars/uwe-pilz/sketches/52Her_120_%20180x.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU627 (A-BC): 52 Her. Very bright white star with a companion disk 2", 4-5 delta mag. Wow! B appears as if it is illuminated by A's light. Did not detect BC, 0.3"
STF2118, 20 Dra AB 7m.1 7m.3 0.9" 65° 2018 Dra 16h56m25.32s / +65°02'20.60"

../images/binary-star-orbits/STF2118-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr einfach ../projects/double-stars/frederik-wanink/sketches/20Dra.jpg
STT318 7m.0 9m.6 2.9" 243° 2016 Her 16h56m39.66s / +14°08'24.90"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x zeigt sich das Pärchen in guten Momenten knapp getrennt - bei 107x wird Komponente B besser sichtbar, er wirkt gräulich wie ein halbdurchsichtiger Geist - die Trennung ist nun eindeutig, aber immer noch knapp - großer schwer einschätzbarer Helligkeitsunterschied zwischen A und B, gut 2.5 Größenklassen Differenz habe ich in der Nacht geschätzt, Treffer
Jörg S. Schlimmer
Germany
127mm (136x) Abstand ca. 3"Separation 3" ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20STT318_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange pair, 3 delta mag, ~3"
STF2112 9m.7 10m.3 2.3" 263° 2020 Her 16h58m14.68s / +31°47'27.60"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Hauptkomponente grau-weiß ../projects/double-stars/uwe-pilz/sketches/STF2112.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Sharp white pair, ~2", ~1 delta mag
H4 122, V451 Her 6m.3 10m.3 18.9" 238° 2020 Her 17h01m33.05s / +14°56'59.00"
Jörg S. Schlimmer
Germany
127mm (136x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20H%204%20122_filtered_96dpi.jpg
★★ mu Dra, 21 Dra, Alrakis, Arrakis STF2130 AB 5m.7 5m.7 2.5" 358° 2020 Dra 17h05m20.20s / +54°28'14.30"
BU1088 AC 5m.7 13m.7 12.2" 174° 2015

../images/binary-star-orbits/STF2130-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
80mm (100x) In May 2019 neatly split, no colours seen. A physical system with a period of 812 years. Periastron was in 1946, since then the distance is widening to reach 2.7“ in 2025 and 2.8“ in 2030
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 107x zeigen sich zwei knapp getrennte Perlchen, beide gleichhell und weiß schimmernd - ein schickes Paar
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB ../projects/double-stars/uwe-pilz/sketches/211225muDra.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Mu Dra. "Arrakis" (which was the name of the planet in the book Dune, but means "Dancer" in Arabic). Light yellow-orange stars, well split, equal. 812 year period
Frederik Wanink
Itterbeck (Germany)
254mm (460x) AB: gleich hell ../projects/double-stars/frederik-wanink/sketches/STF2130.jpg
STF2122 6m.4 9m.7 20.3" 279° 2016 Oph 17h06m52.94s / -01°39'22.00"
Uwe Pilz
Leipzig (Germany)
16x70 konzentriertes Schauen erforderlich; der helle ist gelb ../projects/double-stars/uwe-pilz/sketches/200725_STF2122.jpg
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x zeigt sich das Pärchen gut getrennt, B segelt sichtbarkeitstechnisch hart am Limit - bei 32x ist Komponente B im Westen weiter sehr schwach bzw. mindestens 2 Größenklassen schwächer - schöner Farbkontrast, weiß-gelb vs. grau-blau
Mark McCarthy
Fremont (California/USA)
203mm (333x) Pale yellow and wide separated B, 2 delta mag.
★★ STF2140, alpha Her, 64 Her, Ras Algethi AB 3m.5 5m.4 4.7" 103° 2020 Her 17h14m38.86s / +14°23'24.90"

../images/binary-star-orbits/STF2140-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
36mm (50x) At 50x secondary detaches momentarily from first diffraction ring of primary as the tiniest pinprick of light, delta-mag seems massive.
At 66x separation becomes much clearer. Can hold secondary 80% of the time as a fine point on the outer rim of the first diffraction ring. Primary is orange-yellow, secondary far too faint in this aperture for any kind of colour impression. Rather charming in a strange sort of way. See for comparison simultaneous observation with 210mm at 68x.
Robert Zebahl
Leipzig (Germany)
55mm (41x) Well split with noticeable difference in brightness.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x ist noch nichts erkennbar - bei 64x wird östlich von Rasalgethi der schwache Begleiter B knapp getrennt sichtbar - A ist strahlend gelb, B mit einer Tendenz zum gelb, eher ein warmes weiß
Uwe Pilz
Leipzig (Germany)
105mm (88x) himmelblau und hellgelb, getrennt bei 53x ../projects/double-stars/uwe-pilz/sketches/191025_alphaHer.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb-lachsfarben
Robert Zebahl
Leipzig (Germany)
120mm (100x) Easily split with noticeable difference in brightness. A: intensively orange colored, B: slightly orange.
Karsten Kopp
Köln (Germany)
140mm (94x) Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer
Germany
150mm (85x) bei Halbmond auf der Schwäbischen Alb: sehr eng, aber sauber getrennt, eine Komponente ist viel heller und größer, mein Farbeindruck ist allerdings unerwartet eher gelb
Sarah Gebauer
Germany
150mm (160x) richtig gold, es strahlt mich richtiggehend an, auch sehr schön getrennt, ein toller Doppelstern! ../projects/double-stars/sarah-gebauer/sketches/20200805%20Alpha%20Her%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Rasalgethi. Wow best ever view, perfect disks with no flaring. Light orange A and 2 delta mag light aqua B. Physical with a 3600-year period
Mark McCarthy
Fremont (California/USA)
203mm (667x) Rasalgethi. 8" inch mask due to seeing. AB orange and blue 4 delta mag. Faint AD seen very wide separation. pretty star.
Christopher Hay
Seeheim (Germany)
210mm (68x) Despite the primary being a little bloated in mediocre seeing, the secondary is set off clearly as a fine pinprick of light. Both are orangish-yellow. A very charming sight. See for comparison simultaneous observation with 36mm at 66x.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gelblich und bläulicher Stern ../projects/double-stars/frederik-wanink/sketches/AlphaHer.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Rasalgethi, Bright orange A & pale green much fainter B. Very nice!
Karsten Kopp
Köln (Germany)
600mm (135x) Leicht zu trennen. Komponente A erscheint orange, Komponente B gelblich.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen. Komponente A erstrahlt orange und Komponente B gelblich. ../projects/double-stars/karsten-kopp/sketches/STF2140.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/alpha%20Herculis.jpg
Jens Leich
Germany
130mm ../projects/double-stars/jens-leich/photographs/Doppelstern_Rasalgethi_Herkules_220719_2159UT_RGB.jpg
★★ STF3127, delta Her, 65 Her AB 3m.1 8m.3 13.8" 291° 2020 Her 17h15m01.92s / +24°50'22.50"
René Merting
Drachhausen (Germany)
100mm (64x) was für ein schönes ungleiches Paar - bei 64x präsentiert sich Komponente A gleißend hell und weiß, B zeigt sich gut abgesetzt westlich von A - zurück auf 32x habe ich bei der Strahlkraft von A keine Chance mehr, B zu erkennen - sehr schick ab 64x
Stefan Loibl
Rosenheim (Germany)
102mm (68x) Faint component B is not visible at 26x. At 68x B is visible and split. Component A yellowish. ../projects/double-stars/stefan-loibl/sketches/DeltaHer_20200601.jpg
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy. Pretty wide apart with large difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_delta_her.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Very bright yellow white A and bluish B at least four delta mag, wide separation. I don't think it would be seen but for the mask tightening A's diffraction
Mark McCarthy
Fremont (California/USA)
317mm (553x) Sarin. Very bright and much fainter B, looks like a planet
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern gut zu trennen. Der Reiz von diesem Doppelstern liegt im schon extremen Helligkeitsunterschied von über 5 mag. Komponente A erstrahlt weiß und die Komponente B leicht rötlich.
omicron Oph, 39 Oph, H3 25 5m.2 6m.6 10.8" 355° 2019 Oph 17h18m00.71s / -24°17'12.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Farbkontrast wohl wegen südl.Stellung nicht zu sehen ../projects/double-stars/frederik-wanink/sketches/OmiOph.jpg
STF2161, 75 Her, rho Her AB 4m.5 5m.4 4.1" 321° 2019 Her 17h23m40.97s / +37°08'45.30"
Robert Zebahl
Leipzig (Germany)
55mm (38x) Very nice view. Easily split with visible difference in brightness. Pretty tight. Component A appeared rather white, B slightly yellowish. The double star forms with two other, fainter field stars a conspicuous, acute-angled triangle, whereby the double star marks the tip.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x sind beide Komponenten klar getrennt erkennbar - Komponente B im NW ist eine knappe Größenklasse schwächer - A creme-weiß, B kühler weiß-bläulich - zurück auf 64x kann ich den Doppelstern auch schon ganz knapp getrennt erkennen, da war ich wohl nicht mutig genug, dass ich mit 107x begonnen habe
Sarah Gebauer
Germany
150mm (170x) der typische Doppelstern für mich, er bildet mit zwei ählich hellen Sternen ein schönes, langes und spitzes Dreieck ../projects/double-stars/sarah-gebauer/sketches/20200723%20Rho%20Her%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Rho Her. Lovely cream-white stars, half delta mag, nice split
Mark McCarthy
Fremont (California/USA)
203mm (667x) Rho Her. Light yellow white stars 1 delta mag well separated.
STF2166 7m.2 8m.6 27.0" 282° 2017 Oph 17h27m52.25s / +11°23'25.80"
Uwe Pilz
Leipzig (Germany)
105mm (88x) trennbar bei 22x ../projects/double-stars/uwe-pilz/sketches/191025_STF2166.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Blue-white A and wide 1 delta mag red B. WDS says physical and that's probably correct, 41% parallax range overlap and 3,225 AU weighted separation. 2.03/1.47 stellar mass
Mark McCarthy
Fremont (California/USA)
203mm (333x) White and slight off-white wide separation B.
★★ STFA35, nu Dra, nu 1/2 Dra, 24/25 Dra 4m.9 4m.9 62.1" 311° 2017 Dra 17h32m15.88s / +55°10'22.10"
Christopher Hay
Seeheim (Germany)
3x63 Hair-fine split.
A physical double at a distance to us of 99 light years.
Christopher Hay
Seeheim (Germany)
7x45 Well split and very compact. A very evenly matched pair, both colourless. Attractive in 8.6° FOV together with the rest of the head of the dragon, namely Beta, Gamma and Xi Dra (Rastaban, Etamin, Grumium).
Christopher Hay
Seeheim (Germany)
10x42 Clearly split, components of identical brightness, no colour. One of the finest doubles for 10x.
René Merting
Drachhausen (Germany)
16x70 der Doppelstern ist bereits mit bloßem Auge zu erkennen, im FG dann offenbart sich ein ordentlich getrenntes Pärchen zweier gleich heller Sterne
René Merting
Drachhausen (Germany)
18x70 zwei sehr helle reinweiße Sterne, komfortabel voneinander getrennt - sehr auffällig
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schönes, auffallendes Pärchen zweier gleich heller Sterne - beide sind komfortabel getrennt erkennbar und präsentieren sich weiß
Sarah Gebauer
Germany
100mm (50x) Nu1 und Nu2 Draconis starrt mich so richtig eindringlich als Augenpaar an, sie stehen in einem ansonsten ganz leeren, schwarzen Umfeld
Robert Zebahl
Leipzig (Germany)
102mm (28x) Wide, bright, equal pair. Both components looked cream-white. Due to the distance a double for binoculars.
Christopher Hay
Seeheim (Germany)
125mm (80x) Gorgeous sight, widely split, dominating the FOV. The more northern B-component (=Nu1 Dra = 24 Dra) appears brighter and more yellowish than the A-component (=Nu2 Dra = 25 Dra).
Sarah Gebauer
Germany
150mm (85x) auf den ersten Blick "zwei Augen", die mich anleuchten, ansonsten aufgrund der wenigen Feldsterne eher unspektakulär ../projects/double-stars/sarah-gebauer/sketches/20200624%20Ny%20Dra%20DSk.jpg
STFA34, 53 Oph AB 5m.8 7m.5 41.3" 190° 2019 Oph 17h34m36.69s / +09°35'12.20"
AC 5m.8 11m.9 96.6" 343° 2013
AD 5m.8 12m.0 127.0" 213° 2020
BD 7m.5 12m.0 90.6" 223° 2015
René Merting
Drachhausen (Germany)
16x70 AB: gut getrenntes Pärchen, bei dem Komponente B im Süden deutlich schwächer und grau gegenüber A wirkt
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x weit getrenntes helles Pärchen, wobei Komponente B im Süden gut 1.5 Größenklassen schwächer - Komponente weiß-gelb, B gräulich
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: weiß und blaugrau. Trennbar bei 22x ../projects/double-stars/uwe-pilz/sketches/191025_53Oph.jpg
STF2191 AB 7m.8 8m.5 26.4" 267° 2018 Oph 17h39m47.28s / -04°58'04.80"
Uwe Pilz
Leipzig (Germany)
16x70 schwierig aber sehenswert ../projects/double-stars/uwe-pilz/sketches/200725_STF2191.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Wide separation near equal (AB seen. BC is Ho 419 12.71 7.6" not seen)
STF2203 7m.7 7m.8 0.8" 292° 2018 Her 17h41m13.81s / +41°39'17.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2203.jpg
★★★ STF2202, 61 Oph AB 6m.1 6m.5 20.8" 93° 2019 Oph 17h44m34.09s / +02°34'45.90"
René Merting
Drachhausen (Germany)
8x30 die B-Komponente ist östlich von A erkennbar, lässt sich aber noch nicht trennen - eine klassische Ameise
René Merting
Drachhausen (Germany)
10x35 ein richtig schöner Doppelstern für 10-fache Vergrößerung - zwei gleich helle Sterne, knapp getrennt
René Merting
Drachhausen (Germany)
10x50 ein ausgesprochen schönes knapp getrenntes Sternpaar - beide Sterne sind in etwas gleich hell - Komponente B im Osten ist nicht ganz so weiß wie A
René Merting
Drachhausen (Germany)
15x56 wunderschön - ein sauber getrenntes Sternpaar, wobei B im Osten nur minimal schwächer wirkt - beide Sterne zeigen sich strahlend weiß
René Merting
Drachhausen (Germany)
16x70 ein schön eng stehendes Pärchen, knapp getrennt - Komponente A im Westen ist nur leicht heller als B - beide Komponenten wirken weiß
Uwe Pilz
Leipzig (Germany)
16x70 beide gelb ../projects/double-stars/uwe-pilz/sketches/200725_61Oph.jpg
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x leicht zu trennen - Komponente B im Osten ist nur minimal schwächer (keine halbe Größenklasse, denke ich) - Komponente A stahlt ein wenig wärmer als B
Sarah Gebauer
Germany
150mm (30x) bei geringer Vergrößerung (30x) schon sauber getrennt, beide Sterne wirken gleich groß und gleich hell, ein nettes Pärchen
Sarah Gebauer
Germany
150mm (54x) zwei nicht ganz enge Glanzpünktchen in einer eher uninteressanten Umgebung
Mark McCarthy
Fremont (California/USA)
203mm (667x) Half delta mag wide separation white.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/61%20Ophiuchi.png
STT338 AB 7m.2 7m.4 0.9" 168° 2018 Her 17h51m58.46s / +15°19'34.90"

../images/binary-star-orbits/STT338-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220727STT338.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt
Mark McCarthy
Fremont (California/USA)
317mm (553x) Just split, a pair of bright near equal orange stars.
Mark McCarthy
Fremont (California/USA)
508mm (667x) Yellow-white very clean split stars seem more equal than what the data says
★★★ S694 6m.7 7m.3 79.3" 238° 2018 Oph 17h52m05.20s / +01°06'40.30"
René Merting
Drachhausen (Germany)
15x56 ein idealer FG-Doppelstern mit schön anzusehendem Farbkontrast - Komponente A im Osten strahlt reinweiß, hat ordentlich Abstand ist eine halbe Magnitude schwächer und wirkt weißgrau, fraglich wo bei diesen Farben der Farbkontrast herkommen soll, das Pärchen entfaltet trotzdem diese Wirkung
Uwe Pilz
Leipzig (Germany)
16x70 gelbweiß und blau; identisch WDS1752+0107 ../projects/double-stars/uwe-pilz/sketches/200725_S694.jpg
★★ STF2308 40/41 Dra AB 5m.7 6m.0 18.7" 232° 2019 Dra 18h00m09.07s / +80°00'13.70"
AC 5m.7 8m.3 225.3" 129° 2017

../images/binary-star-orbits/STF2308-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
8x44 2020-06-27: The pair AB split, but very tight with components of equal brightness. In acute angle far apart the component C was also visible.
Christopher Hay
Seeheim (Germany)
15x45 AB: Clearly split, brighter component seems bluish. One of the finest doubles for 15x, hence my two-star rating. In 10x42 a difficult split at the limit.
René Merting
Drachhausen (Germany)
16x70 ein schön eng stehendes Pärchen, die Himmelsrichtungen erschließen sich mir hier leider nicht, aber die Komponenten sind beide ähnlich hell und weiß - schöner Anblick im Fernglas
Christopher Hay
Seeheim (Germany)
50mm (8x) AB: An elongated figure-8 very close to splitting
Christopher Hay
Seeheim (Germany)
80mm (30x) AB: Very clearly split, dominates the 2.5° FOV, with interesting sprinkling of fainter stars throughout the field.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very nice, slightly uneven pair. Components appeared yellowish-white. Beautiful surroundings. On the sketch the components A, B and C are visible. ../projects/double-stars/robert-zebahl/sketches/2019-06-30_40_41_dra.jpg
Uwe Pilz
Leipzig (Germany)
105mm (100x) AB: =40/41 Dra. Auffallend
Christopher Hay
Seeheim (Germany)
140mm (75x) AB: Wide apart, the pair absolutely dominates the field of view, with attractive sprinkling of fainter stars to the west. Very delicate colour contrast that was hard to grasp in 3-inch scope now becomes clear, component B (40 Dra) is bluish, component A (41 Dra) yellowish.
H6 2, 67 Oph AC 4m.0 8m.1 54.7" 143° 2019 Oph 18h00m38.72s / +02°55'53.70"
René Merting
Drachhausen (Germany)
10x35 zwischen beide Sterne passt maximal ein halbes Blatt Papier - C im Südosten kommt mir entgegen aller früheren Erfahrungen nicht so schwach vor wie sonst, ich würde hier nur auf maximal eine Größenklasse schätzen, eigenartig
René Merting
Drachhausen (Germany)
10x50 ein einfacher Doppelstern - Komponente C steht mit gutem Abstand südöstlich von A - Komponente A ist gleißend weiß, C wirkt dagegen richtiggehend grau-braun
Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. Components wide apart, almost too wide to appear as a double star. Secondary a fine speck of light beside the primary, which is >4mag brighter. According to Stelledoppie a true physical pair at a distance of 1230 light years. It is interesting to contemplate that at this distance in space the companion still looks so separate. “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 6 in the name means that it is a double star of the 6th Class [separation 1’ or larger] in Herschel’s system.
René Merting
Drachhausen (Germany)
16x70 auf den ersten Blick bin ich enttäuscht, weil ich nur einen hell strahlenden Stern erkennen kann - dann aber mit etwas Konzentration ist südöstlich von der Leuchtgranate ein ganz schwacher Begleiter zu erkennen - ein sehr ungleiches Paar mit geschätzt 4 Größenklassen Unterschied - Komponente C wirkt rotbraun und steht ordentlich getrennt von A
Uwe Pilz
Leipzig (Germany)
16x70 der helle ist gelb-weiß ../projects/double-stars/uwe-pilz/sketches/200725_67Oph.jpg
Christopher Hay
Seeheim (Germany)
25x80 Very far apart, almost so far as to appear to not belong together. However, in the 3° field of view 70 Ophiuchi, which is also a physical double, is seen to be also split. Thus a very attractive field overall.
67 Oph and 70 Oph are the left and right nostrils of the bull in the old constellation Taurus Poniatowski (Poniatowski’s Bull). 68 Oph (the tip of the bull’s nose) and 73 Oph (the bull’s right eye) are also double stars, but can’t be split at 25x. All four doubles – 67, 68, 70 and 73 Oph – are physical, a rare assemblage!
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x großer Abstand zwischen beiden Sternen - weil Komponente A so gleißend hell strahlt, fehlt der mindestens um 3 Größenklassen schwächeren Komponente C im SO die Farbe, eher gräulich
STF2264, 95 Her 4m.8 5m.2 6.4" 255° 2020 Her 18h01m30.41s / +21°35'44.80"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x mein erster Eindruck ist, dass zwei annähernd gleichhelle sehr eng stehende Sterne mich wie zwei Augen anschauen, das unmittelbare Sternumfeld passt schön und verleiht dem Doppel eine hervorgehobene Stellung - Komponente B im Westen ist nur minimal schwächer als A - in guten Momenten ist die Trennung sehr eindeutig erkennbar
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x zwei helle, knapp getrennte Sterne - die schwächere westliche Komponente zeigt ein schönes, helles Gelb und wirkt dadurch leicht schwächer - zurück auf 32x ist eine 8 mit deutlicher Einschnürung erkennbar - der Farbunterschied ist ebenfalls deutlich
Uwe Pilz
Leipzig (Germany)
105mm (288x) ../projects/double-stars/uwe-pilz/sketches/95Her.jpg
Karsten Kopp
Köln (Germany)
140mm (94x) Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer
Germany
150mm (54x) zwei enge, hübsche Glanzpünktchen, die ich zuvor ziemlich lange in dem hellen Sterntrapez gesucht habe
Robert Zebahl
Leipzig (Germany)
152mm (49x) 2020-06-23: At 49x eye catching double star, relatively tight with rather small difference in brightness. Beautiful color impression, which was even better visible at 69x: yellowish and yellowish-orange.
Mark McCarthy
Fremont (California/USA)
508mm (667x) 95 Her. Orange and blue, wide, bright.
Karsten Kopp
Köln (Germany)
600mm (135x) Sehr einfaches und auffälliges Objekt. Kein Helligkeitsunterschied erkennbar.
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/95%20Herculis.png
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/95%20Her.jpg
STF2262, tau Oph AB 5m.3 5m.9 1.5" 290° 2019 Oph 18h03m04.91s / -08°10'48.90"

../images/binary-star-orbits/STF2262-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (240x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2262.jpg
70 Oph, P Oph, STF2272 AB 4m.2 6m.2 6.6" 122° 2019 Oph 18h05m27.37s / +02°29'59.30"

../images/binary-star-orbits/STF2272-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
16x70 nicht einfach; der helle ist gelb ../projects/double-stars/uwe-pilz/sketches/200725_70Oph.jpg
Christopher Hay
Seeheim (Germany)
25x80 Clean split, component A appears yellowish.
70 Oph is the left nostril of the bull in the old constellation Taurus Poniatowski (Poniatowski’s Bull). On the connections to 67, 68 and 73 Oph see the entry on 67 Oph.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x wirkt der Stern nicht rund, sondern ein wenig nach SO verschmiert - bei 64x dann eindeutig ein knapp getrenntes schön anzusehendes Pärchen - Komponente A hell-gelb, B orange-gelb
Jörg S. Schlimmer
Germany
127mm (136x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%2070%20Oph_filtered_96dpi.jpg
Sarah Gebauer
Germany
150mm (85x) ein ganz leicht goldener Farbeindruck des Sternpaares, die Sterne stehen recht dicht beisammen und sind dennoch schön getrennt ../projects/double-stars/sarah-gebauer/sketches/20200805%2070%20Oph%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (80x) Conditions in the target region: SQM-L 20.1
Well split at 80x. Brighter component appeared white, fainter one slightly orange.
Berthold Fuchs
Wiesbaden (Germany)
130mm difficult DS ../projects/double-stars/berthold-fuchs/photographs/70%20Ophiuchi.png
★★ STF2280, 100 Her AB 5m.8 5m.8 14.3" 183° 2019 Her 18h07m49.56s / +26°06'04.40"
René Merting
Drachhausen (Germany)
10x35 ein 8, eine Einschnürung ist ab und an erkennbar - Trennung nicht möglich
René Merting
Drachhausen (Germany)
10x50 zwei extrem dicht stehende helle Sterne - noch nicht getrennt, aber schön als 8 erkennbar
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-05: Very nice, rather isolated double star. Striking. Similar bright component, both white.
René Merting
Drachhausen (Germany)
18x70 perfekt für 18-fache Vergrößerung - zwei gleich helle, dicht zusammen stehende Sterne - reinweiß und sehr auffällig, weil keine ähnlich hellen Sterne im Umfeld zu sehen sind
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schönes, enges Pärchen zweier gleichheller Sterne - beide gleich hell und reinweiß - zurück auf 20x zeigen sich beide Protagonisten weiterhin ganz knapp getrennt - Komponente B im Süden wirkt leicht gelblich und schwächer
Uwe Pilz
Leipzig (Germany)
105mm (26x) Weiß-orangeweiß
Robert Zebahl
Leipzig (Germany)
120mm (40x) Conditions in the target region: SQM-L 20.5
Very nice, evident double star with equally bright components.
Karsten Kopp
Köln (Germany)
140mm (94x) Doppelstern ist einfach zu trennen. Das besondere ist hier, dass die beiden Sterne recht alleine zu stehen scheinen. Beide erscheinen weiß.
Sarah Gebauer
Germany
150mm (54x) zwei hübsche Glanzpünktchen, die mich an ein Knöpflein mit zwei Löchern erinnern, der "typische" DS für mich: nicht zu eng, nicht zu weit, gleich hell, sehr nett ../projects/double-stars/sarah-gebauer/sketches/20200805%20100%20Her%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Beautiful view. Easy to separate with components of the same brightness. It is noticeable that there are no brighter stars in the immediate vicinity, so that the double star stands out very well.
Mark McCarthy
Fremont (California/USA)
203mm (205x) 100 Her. Bright equal wide yellow-white stars. [not physical]
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/100%20Herculis.png
STF2281, 73 Oph AB 6m.0 7m.5 0.8" 283° 2019 Oph 18h09m33.86s / +03°59'35.80"

../images/binary-star-orbits/STF2281-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen, schwierig ../projects/double-stars/frederik-wanink/sketches/73Oph.jpg
★★ HU674 7m.7 8m.6 0.7" 214° 2018 Her 18h09m40.64s / +50°24'07.40"

../images/binary-star-orbits/HU674-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt, ähnlich hell ../projects/double-stars/frederik-wanink/sketches/HU674.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Split with seeing at 333x, near equal white.
STF2289 6m.7 7m.2 1.2" 218° 2019 Her 18h10m08.69s / +16°28'35.00"

../images/binary-star-orbits/STF2289-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Just split in 20" at 205x, but flaring. 333x had messy diffraction. 8" mask at 333x gave clean disks, split, ~0.7". Dull yellow and yellow-red colors.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Hauptstern gelb, Begleiter scheint bläulich ../projects/double-stars/frederik-wanink/sketches/STF2289.jpg
★★★ BU641 7m.0 8m.7 0.8" 341° 2015 Her 18h21m48.44s / +21°30'27.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr schwierig ../projects/double-stars/frederik-wanink/sketches/BU641.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extraordinary! Moderately bright A and very much fainter B, 4-5 delta mag, <1" separation. Seeing needs to still.
Mark McCarthy
Fremont (California/USA)
508mm (533x) V989 Her. Seen as a snowman dot to bright white A @ 333x, split with 533x, inside first diffraction ring. Need A's disk to be perfectly tight for B to resolve with seeing. Very nice. 1" at discovery 1878 with Dearborn 18.5-inch
STF2323, 39 Dra AC 5m.1 8m.0 88.9" 20° 2020 Dra 18h23m54.65s / +58°48'02.10"
AB 5m.1 8m.1 3.6" 348° 2020

../images/binary-star-orbits/STF2323-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: Pretty wide, unequal pair. Die brighter A component appeared white.
Robert Zebahl
Leipzig (Germany)
55mm (71x) AB: Very nice. The B component seemed to be comparable faint as the C component. ../projects/double-stars/robert-zebahl/sketches/2019-05-18_39_dra.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 39 Dra. Brilliant white A and slightly ruddy B, ~3 delta mag, ~4" sep. 3962.5 year period.
STF2315 AB 6m.6 7m.8 0.6" 117° 2018 Her 18h24m58.46s / +27°23'41.30"

../images/binary-star-orbits/STF2315-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/STF2315.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) ! Hairline split @ 553x near equal mag. Suspected elongation at 277x.:
Mark McCarthy
Fremont (California/USA)
508mm (533x) Barely split with seeing, resolves to two disks, more than hairline but almost 2 delta mag, very tough, need perfect seeing. 2094 year period
STT351 & HU66 HU66 AB 7m.9 8m.4 0.2" 197° 2016 Dra 18h25m18.20s / +48°45'42.50"
STT351 AC 7m.9 8m.2 0.8" 26° 2019
HU66 BC 8m.4 8m.2 0.8" 26° 2019

../images/binary-star-orbits/HU66-AB-orbit.jpg ../images/binary-star-orbits/STT351-AC-orbit.jpg ../images/binary-star-orbits/HU66-BC-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (305x) STT351 (AC): Split, better with seeing, light orange stars, significant mag difference. Did not notice HU 66 AB, 7.9/8.4 0.1" or HU 66 BC, 8.40/8.25 0.9 -- need to go back to this one!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) HU66 (BC): getrennt ../projects/double-stars/frederik-wanink/sketches/HU66.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) HU66 (BC): Very fine near equal pair, yellowish A and blue-white B. ~1" or less.
Mark McCarthy
Fremont (California/USA)
508mm (333x) STT351 (AC): Orange stars, noticeable magnitude difference ~0.5, separated just less than ~1". What's curious is the AB pair is HU 66 AB listed as 7.90/8.40 0.1" currently, with HU 66 BC as 8.40/8.25 0.9". So my question is, if AC is physical, and if BC are physical too, why is AC uncertain? It would seem they should all be sharing orbits? Perhaps it just cries out for additional measures -- AB is grade 4 and BC is grade 5, so they are confident of physicality but there's not enough data to nail it down.
STF2320 7m.1 8m.9 0.9" 2015 Her 18h27m45.89s / +24°41'50.80"
Mark McCarthy
Fremont (California/USA)
203mm (667x) V994 Her. Seen with the 20", but used the 8" mask to clean up the images. Two delta mag, ~1" very nice pair. [eclipsing binary of Algol type--surely not seeing the eclipsing star? In fact, both A & B each are eclipsing binaries, the first such system to be discovered in the whole sky!]
Frederik Wanink
Itterbeck (Germany)
254mm (640x) ../projects/double-stars/frederik-wanink/sketches/STF2320.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Blue-white stars, 1", 2 delta mag.
★★ STT359 6m.3 6m.6 0.7" 2019 Her 18h35m30.40s / +23°36'19.90"

../images/binary-star-orbits/STT359-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-11-10: Clearly elongated with slight notching and little difference in brightness. I estimated the position angle to 0°.
Uwe Pilz
Leipzig (Germany)
105mm (198x) leicht eingekerbt, Abstand 0“75 ../projects/double-stars/uwe-pilz/sketches/stt359.jpg
Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220727STT359.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Light orange near equal stars, notched elongation, overlapping disks. Physical with a 219-year period, at apastron now
Mark McCarthy
Fremont (California/USA)
203mm (667x) Kissing 8" 333x, hairline split 667x. Near equal white A and bluish white B.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STT359.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! ~0.8" equal yellow-orange stars.
Uwe Pilz
Leipzig (Germany)
320mm (388x) ein sehr ruhiger Abend gestattete die Nutzung von 12 Zoll ../projects/double-stars/uwe-pilz/sketches/200808stt359.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Light yellow near equal split, very close. 219 year period
STF2349 AB 5m.4 9m.4 7.2" 204° 2016 Lyr 18h36m37.34s / +33°28'08.50"
Robert Zebahl
Leipzig (Germany)
102mm (125x) Easy to split with a clear difference in brightness. The companion only appeared as a tiny star. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_stf2349.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) ../projects/double-stars/uwe-pilz/sketches/stf2349.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) viel schwieriger, als es die Daten vermuten lassen (7") ../projects/double-stars/uwe-pilz/sketches/191031STF2349.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Bright white A, B is a ghostly grey, faint but seen with direct vision, well separated. WDS is uncertain; there is a 38% parallax overlap, 1,188 AU weighted separation, and the stellar masses are high, 3.58 & 1.22 -- so it may well be gravitationally bound
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white and faint ruddy B, fairly close ~4".
★★ alpha Lyr, 3 Lyr, Vega H5 39 AB 0m.1 9m.5 83.7" 184° 2017 Lyr 18h36m56.33s / +38°47'01.20"
STFB9 AC 0m.1 11m.0 76.0" 255° 2012
STFB9 AE 0m.1 9m.5 86.6" 39° 2017
Jörg S. Schlimmer
Germany
127mm (203x) um Vega mehrere Beugungsringe sowie Speckles sichtbar, B leicht zu sehen, E nicht sichtbar ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Vega_20190626_ausschnitt_filtered.jpg
Jörg S. Schlimmer
Germany
127mm (203x) verschiedene Vergrößerungen zwischen 40 und 203 fach, Komponente E zeitweise bei indirektem Sehen sichtbar, da Himmel heute klarer ist ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Vega_20190627_ausschnitt_filtered.jpg
STT363 7m.5 8m.1 0.6" 336° 2018 Dra 18h37m23.92s / +77°41'12.40"

../images/binary-star-orbits/STT363-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/STT363.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20363.jpg
STF2372 AB 6m.5 7m.7 25.0" 82° 2019 Lyr 18h42m08.09s / +34°44'46.70"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x weit getrennt, bei 64x noch weiter getrennt :-D, Komponente B halb so hell wie A und deshalb gräulicher
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und blaugrün, erkennbar bei 21x ../projects/double-stars/uwe-pilz/sketches/191031STF2372.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Yellow-green A and slightly blue-white B. 1 delta mag, very wide.
★★★ epsilon Lyr STFA37 AB-CD 4m.7 4m.6 209.5" 172° 2016 Lyr 18h44m20.34s / +39°40'12.40"
STFA37 AI 5m.2 10m.1 149.5" 137° 2015
STF2382, 4 Lyr, epsilon 1 Lyr AB 5m.2 6m.1 2.2" 345° 2020
STF2383, 5 Lyr, epsilon 2 Lyr CD 5m.2 5m.4 2.4" 75° 2020

../images/binary-star-orbits/STF2382-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STF2382-AB-orbit-solution-2.jpg ../images/binary-star-orbits/STF2383-CD-orbit.jpg

Christopher Hay
Seeheim (Germany)
naked eye STFA37 (AB-CD): While waiting for Comet Neowise at 3 in the morning in July 2020 surprised myself with my first naked-eye separation of Alpha1 und Alpha2 Capricornis (observing site at 50° northern latitude, Alpha1/2 passing through meridian). Encouraged by this, I lay down and had a close look at Epsilon Lyrae, without really expecting to be able to split it naked-eye, having never succeeded previously. At first Epsilon Lyrae appeared as a very short dash of light. Then the dash resolved into two pinpoints. After 15 years in the hobby and at age 60, at last got Eps Lyr split! No precise prior PA knowledge. After memorising PA as seen naked-eye carefully, confirmed it with binoculars. Eps Lyr is the third-easiest physical double in the (northern hemisphere) summer sky for the naked eye, after Zeta UMa (much easier) und Alpha Lib (marginally easier).
Christopher Hay
Seeheim (Germany)
2x54 STFA37 (AB-CD): Clean split. Actually more pleasant than in 4x10 binoculars, presumably due to more steady handheld view.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2382 (AB): At 42x slightly elongated, at 59x elongated and obviously notched.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2383 (CD): At 42x clearly elongated, but without any visible notch. At 59x split with touching diffraction disks.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2382 (AB): Obviously seen as figure '8'.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2383 (CD): Split, but extremely tight with almost touching diffraction disks.
René Merting
Drachhausen (Germany)
76mm (95x) AB-CD: bei 29x schön getrennt erkennbar, ohne dass sich AB und CD schon trennen lassen
AB: bei 57x leicht länglich mit kleiner Einschnürung - bei 95x schön eng getrennt, B nördlich wirkt etwas schwächer- bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
CD: bei 57x eine 8 - bei 95x ein schön eng getrenntes Pärchen gleichheller Sterne - bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
EF und I: bei 127x sind alle drei Sterne (I 10.1 mag / E 12.3 mag / F 12.7 mag) erkennbar
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x ist das Sternpaar mit leichter Einschnürung und Nord-Süd-Ausdehnung erkennbar - beide Sterne stehen minimal enger zusammen als das südlichere Paar CD - bei 107x knappe Trennung, Komponente B nördlich ist mindestens eine halbe Größenklasse schwächer als A
CD: bei 64x als 8 mit Ost-West-Ausdehnung erkennbar - bei 107x knapp getrennt, beide Komponenten sind etwa gleich hell
Sarah Gebauer
Germany
100mm (136x) ein Test mit dem neuen Refraktor, um einen Vergleich zum 6''-Newton zu ziehen: bei 136x schon astrein getrennt, natürlich ziemlich eng und ganz fein getrennt, aber dennoch ein überraschend positives Ergebnis
Robert Zebahl
Leipzig (Germany)
102mm (125x) Stunning view of the components A-D and I! ../projects/double-stars/robert-zebahl/sketches/2019-06-26_epsilon_lyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (26x) bei 22x nicht trennbar ../projects/double-stars/uwe-pilz/sketches/epsLyr2.jpg
Jörg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Epsilon-Lyrae_ausschnitt_filtered.jpg
Sarah Gebauer
Germany
150mm (250x) August 2019 zum ersten Mal die nah beieinanderstehenden Komponenten sauber getrennt, ein grandioser Doppel-Doppel-Anblick
Winfried Kräling
Marburg (Germany)
152mm (175x) ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2025UT-Epsilon%20Lyrae.jpg
René Merting
Drachhausen (Germany)
320mm (144x) bei 144x sind die Komponenten von AB und CD gerade so getrennt voneinander erkennbar, sie tanzen wie wild miteinander - mit Arperturmaske und Abblendung auf 120 mm zeigen die vier nun deutlich schwächeren Sterne schöne Beugungsscheibchen und sind besser getrennt voneinander sichtbar
Uwe Pilz
Leipzig (Germany)
320mm (200x) 7 Komponenten!! A-B-C-D-E-F-I ../projects/double-stars/uwe-pilz/sketches/epsLyr.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm Double-Double ../projects/double-stars/berthold-fuchs/photographs/epsilon%20Lyrae.png
★★ STFA38, zeta Lyr, zeta 1/2 Lyr AD 4m.3 5m.6 43.7" 150° 2018 Lyr 18h44m46.36s / +37°36'18.40"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Clearly split, almost wide. Primary bluish-white. Fantastic 8.6° FOV together with Eps1/2 and Delta1/2 Lyrae. One of the best doubles for 7x.
Christopher Hay
Seeheim (Germany)
10x42 Clearly separated. Colour contrast between bluish A and orangish D is there if one knows it, but not as striking as in 15x45 binoculars.
Christopher Hay
Seeheim (Germany)
15x45 Component A clear blue-white, component D very pale tangerine orange. Wide split. Colour contrast seems even greater than that of nearby Delta 1/2 Lyrae. Physical double.
René Merting
Drachhausen (Germany)
76mm (29x) bei 29x ein schön getrenntes Pärchen - D im Südosten ist 1.5 Magnituden schwächer und wirkt blaugrau gegen die weißgelbe A-Komponente
Mark McCarthy
Fremont (California/USA)
80mm (13x) Zeta 2 Lyr. Slightly greenish-white stars. Best view in finder, cleaner. Wide, 1 delta mag.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x weit getrennt, Komponente A weißlich, D leicht gelblich
Sarah Gebauer
Germany
100mm (80x) ein typisches Augenpaar, der nördliche Stern leuchtet leicht heller als der südliche
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß-orange ../projects/double-stars/uwe-pilz/sketches/zetaLyr.jpg
Sarah Gebauer
Germany
150mm (85x) weit getrennt, unspektakulär
Winfried Kräling
Marburg (Germany)
152mm (175x) ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2045UT-Zeta%20Lyrae.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Wide, white-yellow stars, one delta
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Zeta%20Lyrae.jpg
STF2390 7m.4 8m.6 4.3" 155° 2016 Lyr 18h45m49.83s / +34°31'06.60"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ploppt Komponente B knapp getrennt auf, vorher war sie unsichtbar - Farben Fehlanzeige
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/191031STF2390.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Orange and very wide separation B, 2x fainter B, bluish.
★★ beta Lyr, 10 Lyr, Sheliak STFA39 AB 3m.6 6m.7 45.7" 149° 2017 Lyr 18h50m04.79s / +33°21'45.60"
BU293 AE 3m.6 10m.1 67.2" 317° 2015
BU293 AF 3m.6 10m.6 86.0" 18° 2015
Christopher Hay
Seeheim (Germany)
10x42 AB: Stabilised binoculars, handheld. B is well apart from A and distinct. Very pretty!
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x and 57x the components A, B, E and F were easily seen. The B component appeared slightly bluish-silver at 22x, but at 57x the color was difficult to tell. All four components form a slightly curved 'Y' with the bright A component in the center.
René Merting
Drachhausen (Germany)
76mm (18x) AB: bei 18x sind die beiden Sterne gut getrennt voneinander zu erkennen
EF: beide Komponenten zeigen sich bei 18x sehr schwach
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x sind die Komponenten A und B weit getrennt, B ist deutlich schwächer
EF: ebenfalls bei 32x machen zwei gleichhelle Fühlersterne (E und F) nördlich von Komponente A das System interessanter - sie sind noch schwächer als B - Farbe konnte ich bei keinem der vier Sterne erkennen
Sarah Gebauer
Germany
100mm (80x) AB: sehr heller und weit getrennter Doppelstern mit einem gefühlten Farbunterschied, der nördliche Stern wirkt warmweiß, der südliche leicht kühl-bläulich
Robert Zebahl
Leipzig (Germany)
102mm (62x) Components A, B, E and F are easily visible. The two southern stars on the drawing do not belong to the system. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_beta_lyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (139x) AB: Begleiter ist tiefrot; die Natur des Systems ist unsicher ../projects/double-stars/uwe-pilz/sketches/betaLyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) schon sichtbar bei 26x, aber schwierig. A blauweiß, B orange. ../projects/double-stars/uwe-pilz/sketches/191031betaLyr.jpg
Jörg S. Schlimmer
Germany
127mm (108x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-beta-Lyrae_filtered_96dpi.jpg
Sarah Gebauer
Germany
150mm (85x) AB: weit getrennt, viele helle Feldsterne
STF2404 6m.9 7m.8 3.6" 180° 2020 Aql 18h50m45.55s / +10°58'35.20"
Robert Zebahl
Leipzig (Germany)
70mm (44x) Already at 22x the double star is striking due to its orange color. At 44x split, but rather tight with a clear difference in brightness. At 100x the primary component appears in a bright orange, the secondary component shows a bluish tint.
René Merting
Drachhausen (Germany)
76mm (57x) bei 57x zeigt sich die B-Komponente extrem knapp getrennt südlich von A und ist knapp eine Größenklasse schwächer - A ist weiß, B grauweiß - bei 95x gefällt mir die Trennung besser
Mark McCarthy
Fremont (California/USA)
203mm (667x) Light orange and light blue, pretty.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) beide gelblich ../projects/double-stars/frederik-wanink/sketches/STF2404.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) well split, yellow A and yellow-orange B.
BU137 AB 8m.7 9m.0 1.3" 203° 2020 Lyr 18h53m57.56s / +37°22'49.70"

../images/binary-star-orbits/BU137-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) ../projects/double-stars/frederik-wanink/sketches/BU137.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Fine near equal light orange, ~2". Rich finder field. In Steph 1 open cluster.
Mark McCarthy
Fremont (California/USA)
508mm (667x) Nice bright white near equal stars, 1.5", in a two plus one system with much fainter farther C. (AC 12th mag 23.6")
delta 2 Lyr, 12 Lyr, delta Lyrae Cluster, Stephenson 1 ES2028 AB 4m.3 11m.2 86.3" 349° 2014 Lyr 18h54m30.29s / +36°53'55.00"
ES2028 BC 11m.2 11m.6 2.1" 135° 2008
SMR13 AD 4m.5 8m.8 193.1" 210° 2014
SMR13 AE 4m.5 10m.3 400.6" 238° 2014
SMR13 AF 4m.5 8m.8 369.4" 245° 2014
SMR13 AG 4m.5 9m.8 335.9" 261° 2014
SMR13 AH 4m.5 8m.7 229.4" 284° 2014
SMR13 AJ 4m.3 12m.0 279.5" 249° 2014
SMR13 AK 4m.3 12m.0 304.2" 236° 2014
SMR13 HI 8m.7 12m.9 26.1" 251° 2015
Jörg S. Schlimmer
Germany
305mm (94x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-delta-Lyrae_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) ES2028 (BC): Delta 2 Lyr. ! Very cool. A is bright light orange, and BC are blue pinpoints, ~2" with a slight mag difference. Clearly and cleanly seen.
★★ STT525 & SHJ282 STT525 AB 6m.1 9m.1 1.8" 130° 2015 Lyr 18h54m52.52s / +33°58'06.90"
SHJ282 AC 6m.1 7m.6 45.4" 350° 2018
SHJ282 AD 6m.1 11m.0 214.8" 295° 2015
Christopher Hay
Seeheim (Germany)
10x42 SHJ282 (AC): Stabilised binoculars, handheld. Wide split, the A component yellowish. Alias South 282. According to Stelledoppie a physical double.
Robert Zebahl
Leipzig (Germany)
16x70 SHJ282 (AC): 2020-07-06: Easy, striking with reasonably apparent color contrast: yellowish to slightly orange & bluish.
Christopher Hay
Seeheim (Germany)
60mm (15x) SHJ282 (AC): Wide split. Blue colour of C component much more striking than the orange colour of the A component.
Robert Zebahl
Leipzig (Germany)
70mm (22x) SHJ282 (AC): Fairly bright and wide pair. The double star was conspicuous, especially in regard to its color: A appeared orange, C rather grey-bluish. It could be observed together with Messier 57 and beta & gamma Lyrae. Very nice.
René Merting
Drachhausen (Germany)
76mm (18x) SHJ282 (AC): bei 18x ist das Pärchen schon sehr auffällig - A ist hellgelb mit schönem Kontrast zur nördlich stehenden, gut getrennten B-Komponente - bei 57x präsentiert sich B in einem zarten stahlblau
Uwe Pilz
Leipzig (Germany)
105mm (21x) SHJ282 (AC): Orange und türkis ../projects/double-stars/uwe-pilz/sketches/191031SHJ282.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) STT525 (AB): gelbweiß-blau
Christopher Hay
Seeheim (Germany)
125mm (23x) SHJ282 (AC): Widely split, dominates the field of view, very attractive. A component is tangerine orange, C component ice blue. An echo of Albireo. A true physical pair.
Mark McCarthy
Fremont (California/USA)
152mm (285x) STT525 (AB): Suspected at 175x, best seen 285x. Orange A, subtle elongation to notched with best seeing, unequal. Wide SHJ 282 AC also seen. WDS uncertain but there is a -34% parallax overlap, so it's not possible to be
Mark McCarthy
Fremont (California/USA)
178mm (205x) STT525 (AB): Extremely fine point shows just outside bright white A's first diffraction, only with best seeing and when A is a perfect disk. WDS uncertain, however unfortunately there is -34% parallax overlap, it is not physical
Christopher Hay
Seeheim (Germany)
180mm (200x) SHJ282 (AC): A is very distant from C but the two are still a fine pair. Colour of C is more striking than that of A, in a manner similar to my simultaneous observation with 60mm at 15x, but not quite as pronounced.
C has a companion set off from it by a hair of black. I estimate PA from C at approx. 80°, separation very roughly 2". Surprisingly can't find this companion in the double star catalogues.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STT525 (AB): 3er System, sehr schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/STT525.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) SHJ282 (AC): Wide separation orange and blue, 2 delta mag.
Frederik Wanink
Itterbeck (Germany)
254mm STT525 (AB) ../projects/double-stars/frederik-wanink/photographs/STT%20525.jpg
Claus-Dieter Jahn
Leipzig (Germany)
SHJ282 (AC): TS APQ 65/420mm, ZWO ASI 178mc, Livestack with Sharpcap, Exposure time: 1600x 0.6s ../projects/double-stars/claus-dieter-jahn/photographs/2020-04-07_shj282.jpg
STF2421 8m.1 9m.3 24.6" 57° 2015 Lyr 18h56m01.68s / +33°47'08.10"
René Merting
Drachhausen (Germany)
76mm (57x) bei 57x ein eher unauffälliges, ordentlich getrenntes Sternpaar - Komponente B im Nordwesten ist eine Magnitude schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) orange und blaugrün ../projects/double-stars/uwe-pilz/sketches/191031STF2421.jpg
Uwe Pilz
Leipzig (Germany)
105mm (137x) recht weit, einfach
STF2417, theta Ser, 63 Ser, Alya AB 4m.6 4m.9 22.4" 106° 2019 Ser 18h56m13.18s / +04°12'12.90"
AC 4m.6 6m.8 421.0" 58° 2007
René Merting
Drachhausen (Germany)
10x35 AB: wunderschön für diese Vergrößerung - zwei helle dicht beieinander stehende Sterne, knapp getrennt - die hellsten Sterne im Umfeld
René Merting
Drachhausen (Germany)
10x50 AB: zwei helle schneeweiße Sterne, knapp getrennt - B im Osten ist nur knapp schwächer - ein schönes enges Pärchen
René Merting
Drachhausen (Germany)
16x70 AB: ein gut getrennt zu sehendes Pärchen - beide Sterne stahlen weiß, Komponente B im Osten ist keine halbe Größenklasse schwächer
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x ein auffälliges gut getrenntes Sternpaar - Komponente B östlich ist nur leicht schwächer und strahlt ein wenig warm-weißer
Sarah Gebauer
Germany
100mm (73x) AB: die mit deutlichem Abstand bei 73x getrennten Doppelsterne liegen wie in einem U aus recht gleich hellen Sternen und bilden dabei im Süden den unteren Bereich des Buchstabens ../projects/double-stars/sarah-gebauer/sketches/STF%202417.jpg
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: wide pair, hardly any difference in brightness, wonderful field, double stars looks like an embedded pair of eyes
Berthold Fuchs
Wiesbaden (Germany)
130mm AB: easy DS ../projects/double-stars/berthold-fuchs/photographs/theta%20Ser.png
★★ STF2422 7m.9 8m.2 0.8" 68° 2018 Her 18h57m07.83s / +26°05'45.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Excellent hairline split at 333x with eight inch. Near equal white stars. Picked them out in a crowded field, suspected elongation right away, split with seeing as I centered it in eyepiece, and from then it was a steady split
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger wegen schwacher Sterne ../projects/double-stars/frederik-wanink/sketches/STF2422.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tight, <0.8", equal light orange, pretty faint.
STF2438 7m.0 7m.4 0.8" 357° 2019 Dra 18h57m28.47s / +58°13'30.00"

../images/binary-star-orbits/STF2438-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) leicht; beide gleich hell ../projects/double-stars/frederik-wanink/sketches/STF2438.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Hairline split, white stars, near equal. 261.6 year period, look how fast it will move in the years 2150-2160!
STT369 7m.8 7m.9 0.7" 2018 Dra 19h07m06.37s / +72°04'26.60"

../images/binary-star-orbits/STT369-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) zeitweilig gut erkennbar ../projects/double-stars/frederik-wanink/sketches/STT369.jpg
★★ STF2470 7m.0 8m.4 13.8" 267° 2017 Lyr 19h08m45.20s / +34°45'37.10"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Striking with well visible brightness difference. Very nice together with STF2474, which gives a similar view. A double-double for binoculars.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2474 unmittelbar 10' südlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2470 knapp schwächer als A-Komponente von STF2470
Robert Zebahl
Leipzig (Germany)
102mm (40x) Striking, especially with STF 2474 in one visual field. The color of the components was not clearly visible. Worthwhile! Sketch see STF 2474.
Sarah Gebauer
Germany
150mm (85x) nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen ../projects/double-stars/sarah-gebauer/sketches/20200723%20STF2470-4%20DSk.jpg
★★ STF2474 AB 6m.8 7m.9 16.0" 263° 2019 Lyr 19h09m04.35s / +34°35'59.90"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Striking with well visible brightness difference. Very nice together with STF2470, which gives a similar view. A double-double for binoculars.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2470 unmittelbar 10' nördlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2474 knapp heller als A-Komponente von STF2470 - bei 64x Komponente A ein wenig gelblich
Robert Zebahl
Leipzig (Germany)
102mm (40x) Pretty conspicuous, easy double star. Especially attractive with the nearby double star STF 2470, as both are very similar in brightness, distance and position angle. The color of both components appeared slightly yellowish-orange. ../projects/double-stars/robert-zebahl/sketches/2019-06-26_stf2470_stf2474.jpg
Sarah Gebauer
Germany
150mm (85x) nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen ../projects/double-stars/sarah-gebauer/sketches/20200723%20STF2470-4%20DSk.jpg
Christopher Hay
Seeheim (Germany)
150mm (96x) Widely separated. Component A yellowish, B light ice-blue. A true physical pair in 171 LY distance. Very attractive in field of view together with Struve 2470 about 10 arcseconds north. The components of each of the two Struves have almost the same position angles, similar separations and very similar delta-magnitudes. Struve 2470 is like an echo of 2474 but with no definite colour impression.
BU139 & STTA177, V338 Sge BU139 AB 7m.1 8m.0 0.6" 136° 2017 Sge 19h12m34.45s / +16°50'47.20"
STTA177 AC 7m.1 8m.0 98.4" 276° 2017
BU139 AE 7m.1 11m.2 28.8" 101° 2015
BU139 CD 8m.0 11m.2 138.9" 269° 2015

../images/binary-star-orbits/BU139-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
80mm (13x) STTA177 (AC): Near equal wide pair split in finder
Mark McCarthy
Fremont (California/USA)
152mm (456x) BU139 (AB): Very subtle notched unequal elongation at all powers. Physical with a 587-year period, currently coming of apastron, it will continue to tighten. Component of STT 177. Burnham discovered with his 6-inch in at 0.5", about what it is now, an astounding catch
Frederik Wanink
Itterbeck (Germany)
254mm (640x) BU139 (AB): getrennt, schwierig, 0,6"? ../projects/double-stars/frederik-wanink/sketches/BU139.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STTA177 (AC): Very wide orange-yellow and blue, ~2-3 delta mag.
STT371 AB 7m.0 7m.5 0.9" 161° 2018 Lyr 19h15m56.96s / +27°27'21.40"
AB-C 7m.0 9m.8 47.2" 269° 2019
René Merting
Drachhausen (Germany)
100mm (20x) AB-C: bei 20x ist Komponente C im Westen schwach erkennbar in einem ordentlichen Abstand zu Komponente AB
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2021-08-20: At 28x the much fainter C component is clearly visible at quite a large separation. The tight pair AB showed up at 160x and 187x clearly elongated, partially as an '8'. A small difference in brightness could be guessed. Higher magnifications did not yield any gain. The air was only moderately steady (seeing 3/5).
Mark McCarthy
Fremont (California/USA)
152mm (104x) AB-C: Nice close 2 delta white stars. Not physical. Power too low to notice AB is 0.9" 7.05/7.55 and physical
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Bright pair showed best masked down to 8-inches. Near equal, white stars, perfect!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/STT371.jpg
STF2497 7m.7 8m.5 29.3" 356° 2019 Aql 19h20m01.09s / +05°35'15.70"
René Merting
Drachhausen (Germany)
10x50 ein wenig Geduld war notwendig, aber dann zeigte sich Komponente B leicht abgesetzt nördlich von A - geringer Helligkeitsunterschied
René Merting
Drachhausen (Germany)
18x70 bei 18x ein ausgesprochen schickes Sternpaar - B zeigt sich nördlich von A gut getrennt, aber trotzdem noch eng seinem Partner stehend - Helligkeitsunterschied eine Dreiviertel Größenklasse - sonst gibt es kaum vergleichbare Sterne im Umfeld, so dass sich das Sternpaar schön prominent präsentieren kann
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x einfach trennbar, auffällig - das Sternpaar steht schön isoliert - B im Norden ist eine dreiviertel Größenklasse schwächer und grau, A dagegen ist strahlend weiß - zurück auf 20x ist der Doppelstern auch noch gut getrennt mit eingängigerem Farbkontrast
Sarah Gebauer
Germany
100mm (45x) auf der Suche nach dem PN NGC 6781 zufällig entdeckt, steht recht isoliert im 1,8° großen Gf. und ist bei 45x sehr deutlich getrennt, zwei feine Pünktchen beieinander ../projects/double-stars/sarah-gebauer/sketches/STF%202497.jpg
★★★ beta Cyg, 6 Cyg, Albireo, STFA43 AB 3m.2 4m.7 34.7" 54° 2021 Cyg 19h30m43.29s / +27°57'34.90"
Christopher Hay
Seeheim (Germany)
7x42 Handheld binoculars in reclining chair. Following a surprisingly easy split of Zeta Lyr, I try out whether Albireo may also be splittable. Indeed, the pair is split, difficult but definite. Staring at Altair (Alpha Aql) for a few seconds with the binoculars prior to observing Albireo heigtens my acuity and makes the split more definite. Component A exhibits a mild orange-yellow hue.
Robert Zebahl
Leipzig (Germany)
8x40 Well split, but I didn't recognised any color.
René Merting
Drachhausen (Germany)
10x50 Komponente A ist gleißend hell und stroh-gelb, Komponente B ist deutlich schwächer leicht abgesetzt von A erkennbar und strahlt eigenartig mint-grün
Christopher Hay
Seeheim (Germany)
12x36 Well split. A golden-red, B cold blue. Gorgeous!
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Bright orange & white-bluish.
Robert Zebahl
Leipzig (Germany)
80mm (25x) One of the most beautiful double stars in the northern hemisphere. Differences in brightness and color (orange-blue) are brilliant! Even under urban conditions with small aperture an enjoyment!
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x stehen beide Sterne weit getrennt - Komponente A mit einem satten zitronen-gelb, Komponente B mit einem leichten Stich ins Blaue
Jörg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_127mm.jpg
Sarah Gebauer
Germany
150mm (116x) Erstbeobachtung August 2019: deutlicher Farbunterschied zwischen blau und sattem Gelb zu sehen
Jörg S. Schlimmer
Germany
305mm (170x) alle Komponenten einfach zu trennen ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_305mm.jpg
Werner E. Celnik
Rheinberg (Germany)
150mm ../projects/double-stars/werner-celnik/photographs/Albireo%202015-09-09%20Refr_150-1100%205DMkII%20ISO1600%20IDAS%20HDR_1s-2min%20kl.jpg ../projects/double-stars/werner-celnik/photographs/Albireo%202015-09-09%20Refr_150-1100%205DMkII%20ISO1600%20IDAS%20HDR_1s-2min%20cr%20kl.jpg
Werner E. Celnik
Rheinberg (Germany)
150mm ../projects/double-stars/werner-celnik/photographs/Albireo%20A9918-9920%20RGB%20A4%20mTxt%20kl.jpg
★★★ HN 84, V340 Sge 6m.4 9m.5 28.4" 301° 2013 Sge 19h39m25.33s / +16°34'16.00"
René Merting
Drachhausen (Germany)
12x50 verdammt schwer - Komponente B ist ganz schwach nordwestlich von A auszumachen - beide Sterne berühren sich noch
René Merting
Drachhausen (Germany)
16x70 beide Sterne präsentieren sich gut getrennt, nicht zu weit aber auch nicht zu nah - Komponente A meint es gut mit der Farbe gelb, bei Komponente B kann ich keine Farbe erkennen
Christopher Hay
Seeheim (Germany)
80mm (30x) Primary ruddy red, secondary wide apart but too faint for any colour impression. Straw-yellow Epsilon Saggitae half a degree to the west with its ice-blue eastern companion enhances the experience of colour contrast in the FOV and is actually more attractive than HN 84 with this aperture and power.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x sind beide Komponenten weit getrennt - Komponente A auffällig gelb-orange, B dagegen grau-blau, ein schöner Farbkontrast, der sich bei 32x verstärkt
Sarah Gebauer
Germany
150mm (85x) Holden 84, eine sehr goldgelbe Komponente und in 28'' Abstand die zweite, sehr schwache und weiße Komponente mit einem Hauch von Blau, sehr, sehr schön!
Christopher Hay
Seeheim (Germany)
150mm (96x) Main component ruddy tangerine orange, companion wide apart and ice blue. The longer I look the stronger the colour contrast becomes, which is by no means normal in many doubles. Epsilon Saggitae in same 0.8-degree field of view is straw-yellow with a cold blue companion (a field star?) pointing away from Epsilon in the direction of HN 84. I can’t think offhand of a better colour-contrast pair that can be framed in this manner in the same FOV.
Sarah Gebauer
Germany
150mm (160x) die hellere Hauptkomponente ist deutlich und stark goldfarben, die zweite dagegen sehr schwach, silbrig und dumpf ../projects/double-stars/sarah-gebauer/sketches/HN84.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very pretty orange A and neon blue B, 1 delta mag, very wide
★★ STFA46, 16 Cyg AB 6m.0 6m.2 39.7" 133° 2020 Cyg 19h41m49.09s / +50°31'31.60"
Christopher Hay
Seeheim (Germany)
3x63 Self-built binoculars, hence the unusual specification. Made of top-quality teleconverters, apochromatic and sharp to the edge.
With naked eye under good suburban sky 16 Cyg is just seen. In the 3x binoculars the double is split into two finest points of light in good moments despite the low magnification. A physical pair according to Stelledoppie.

Two-star rating awarded because this is a true physical pair that can be split with the smallest binoculars and reveals increasingly more with growing binocular size (brightness disctinction between A and B in 7x50, colour distinction in 15x45).
Christopher Hay
Seeheim (Germany)
7x50 Finely split, A-component appears very slightly brighter than B-component. A very pleasing binocular pair.
Christopher Hay
Seeheim (Germany)
15x45 Wide split, very strong visual presence dominating 4.5° FOV. A-component very pale orange, B-component equally pale blue.
Robert Zebahl
Leipzig (Germany)
16x70 2021-06-01: Very striking, bright at moderate separation and small difference in brightness. White-yellowish & white.
René Merting
Drachhausen (Germany)
18x70 zwei ordentlich getrennte fast gleich helle Sterne - beide Komponenten sind reinweiß und die hellsten Sterne im unmittelbaren Umfeld - auffällig
Christopher Hay
Seeheim (Germany)
44x100 Extremely strong pair in 1.9° FOV. Northern component marginally brighter and with slightest touch of yellow.
Sarah Gebauer
Germany
100mm (80x) der Doppelstern springt mich regelrecht an bei der Suche nach dem Blinking PN, es sind zwei ganz durchdringende, gleich helle Sternpunkte, die zwar schon einem sternreichen Umfeld stehen, aber dennoch deutlich heller hervortreten; südlich davon befindet sich rein optisch betrachtet eine abgeschwächte Kopie davon ../projects/double-stars/sarah-gebauer/sketches/STFA46.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 16 Cyg: Wide equal orange-yellow, also split in 80mm finder
KUI94 6m.5 7m.8 0.5" 158° 2014 Cyg 19h41m57.63s / +40°15'14.60"

../images/binary-star-orbits/KUI94-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) unsicher, 8förmig ../projects/double-stars/frederik-wanink/sketches/KUI94.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/KUI%2094.jpg
STT383 AB 7m.0 8m.3 0.8" 15° 2014 Cyg 19h42m56.26s / +40°43'18.30"
AC 7m.0 11m.6 45.2" 99° 2002
AD 7m.0 12m.4 68.1" 43° 2002

../images/binary-star-orbits/STT383-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (240x) AB: 2022-08-07: Under these average conditions the double star is well visible as such. The fainter companion appears as a washed out star close to the primary component. In quiet moments the overlapping diffraction disks are well visible.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/STT383.jpg
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/STT%20383%20AB.jpg
STT384 AB 7m.6 8m.2 1.0" 196° 2018 Cyg 19h43m47.09s / +38°19'20.50"
AC 7m.6 9m.8 59.4" 297° 2015
AD 7m.6 10m.8 116.0" 294° 2015
René Merting
Drachhausen (Germany)
100mm (20x) AC: bei 20x weit getrenntes Pärchen - Komponente C ist deutlich schwächer als A
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: deutliches Paar ../projects/double-stars/frederik-wanink/sketches/STT384.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice near equal ~1", rest of field angular with stars (AB seen, AC and AD in the field.)
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/STT%20384%20AB.jpg
STF2579, delta Cyg, 18 Cyg AB 2m.9 6m.3 2.7" 213° 2020 Cyg 19h44m58.44s / +45°07'50.50"

../images/binary-star-orbits/STF2579-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (200x) At 100x only indicated. At 200x the much fainter companion is visible as a slightly elongated brightening on the first diffraction ring.
Uwe Pilz
Leipzig (Germany)
105mm (288x) blauweiß ../projects/double-stars/uwe-pilz/sketches/190726DeltaCygni.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very bright white with ruddy B, ~4", 4 delta mag. Nice!
17 Cyg STF2580 AB 5m.1 9m.2 25.9" 68° 2020 Cyg 19h46m25.60s / +33°43'39.30"
STF2580 AC 5m.1 9m.4 106.3" 122° 2020
WNO56 AF 5m.1 8m.5 792.0" 235° 2002
STF2580 BG 9m.2 8m.6 817.6" 236° 2010
STF2576 FG 8m.5 8m.6 3.2" 155° 2020

../images/binary-star-orbits/STF2580-AB-orbit.jpg ../images/binary-star-orbits/STF2576-FG-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x locker getrennt - Komponente A satt gelb, B wegen des großen Helligkeitsunterschiedes gräulich-bräunlich
Uwe Pilz
Leipzig (Germany)
120mm (140x) ../projects/double-stars/uwe-pilz/sketches/220723_17cyg.jpg
Robert Zebahl
Leipzig (Germany)
152mm (92x) 2021-07-24: At 30x the components A, B & C are easily visible, whereby A & B are still quite close together. The bright component A appears in a pale yellow. At 92x also the pair FG is separated easily and looks less belonging to the system because of the wide separation to the other components. All in all it is worth observing. ../projects/double-stars/robert-zebahl/sketches/2021-07-24_17-cyg.jpg
Winfried Kräling
Marburg (Germany)
152mm (175x) A, B & C ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2020UT-17%20Cygni.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: 17 Cyg: Yellow and slightly red, well separated, 1 delta mag. (This is an amazingly complex system with 11 stars in all sorts of combinations. Why not just call it an open cluster?)
STT386 8m.5 8m.6 1.0" 71° 2018 Cyg 19h48m16.51s / +37°09'37.50"
Robert Zebahl
Leipzig (Germany)
152mm (270x) Clearly visible as a double star with touching diffraction disks. Not difficult.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) trotz schwacher Komp. gut zu sehen ../projects/double-stars/frederik-wanink/sketches/STT386.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Tight near equal, nice, split with seeing, ~1"
★★ STF2583, pi Aql AB 6m.3 6m.8 1.4" 105° 2019 Aql 19h48m42.05s / +11°48'57.30"
Stefan Loibl
Rosenheim (Germany)
102mm (205x) not fully split, seen as constricted '8'
Robert Zebahl
Leipzig (Germany)
120mm (337x) At 100x elongated, at 200x seen as '8'. At 337x split in moments of good seeing, but still very tight. Overall the seeing was not so good.
Sarah Gebauer
Germany
150mm (160x) wieder ganz haarscharf getrennt, bildet ein großes, nettes Dreieck mit Feldsternen, gefällt mir wieder sehr gut! ../projects/double-stars/sarah-gebauer/sketches/20200731%20Pi%20Aql%20DSk.jpg
Sarah Gebauer
Germany
150mm (170x) bei 170x ganz, ganz knapp getrennt, ein haarfeiner, schwarzer Trennstrich ist zu sehen, eine geniale Grenzbeobachtung!
Mark McCarthy
Fremont (California/USA)
152mm (285x) Pi Aql. Very pretty near equal light blue stars, cleanly separated
Mark McCarthy
Fremont (California/USA)
203mm (205x) Pi Aql. Pretty yellow-orange A and a little more than 1 delta mag pale blue B, ~1", yet neatly separated
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Helligkeitsunterschied erkennbar ../projects/double-stars/frederik-wanink/sketches/STF2583.jpg
STT387 7m.1 7m.9 0.5" 94° 2020 Cyg 19h48m43.81s / +35°18'41.30"

../images/binary-star-orbits/STT387-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) zeitweise als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/STT387.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Red, very close pair? Seeing not supporting higher magnification. Marginal.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Overlapping disks, to a nearly hairline split with seeing. Half delta mag.
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20387.jpg
DJU4, 13 Vul 4m.6 7m.4 1.5" 248° 2020 Vul 19h53m27.69s / +24°04'46.60"

../images/binary-star-orbits/DJU4-orbit.jpg

Mark McCarthy
Fremont (California/USA)
152mm (285x) Gorgeous! Bright A and 3 delta mag B appears as a fine point just beyond A's diffraction. Seen at 175x, best at 285x. Physical with a 615-year period, at apastron
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/13Vul.jpg
STF2594, 57 Aql AB 5m.7 6m.3 36.3" 171° 2019 Aql 19h54m37.65s / -08°13'38.30"
René Merting
Drachhausen (Germany)
10x50 ein einfacher Doppelstern - schön getrennt - Komponente A strahlt etwas weißer (ich weiß, es gibt keine Steigerungsformen von Farben)
René Merting
Drachhausen (Germany)
16x70 ein ansehnliches gut getrenntes Sternpaar - Komponente B im Süden ist gut eine halbe Größenklasse schwächer - das Weiß von Komponente A wirkt etwas kühler, während B eher in einem wärmeren zarten creme-gelb strahlt
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein sehr auffälliges, komfortabel getrenntes Sternpaar - Komponente B im Süden ist eine halbe Magnitude schwächer - zurück auf 20x immernoch eine ordentliche Trennung, B wirkt jetzt etwas schmutziger weiß
Uwe Pilz
Leipzig (Germany)
105mm (22x) orange-blau
Uwe Pilz
Leipzig (Germany)
320mm (36x) ../projects/double-stars/uwe-pilz/sketches/211001_57AQL.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/57%20Aquliae.png
STF2605, psi Cyg, 24 Cyg AB 5m.0 7m.5 2.9" 175° 2017 Cyg 19h55m37.82s / +52°26'20.50"
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 80x difficult. At 100x and 133x the fainter component was clearly visible as small, roundish, partly slightly oval brightening.
René Merting
Drachhausen (Germany)
100mm (107x) bei 107x knapp getrennt, A strahlt weiß mit einer schwachen Andeutung von gelb, B im Süden ist deutlich schwächer
Uwe Pilz
Leipzig (Germany)
105mm (96x) nicht schwierig ../projects/double-stars/uwe-pilz/sketches/psiCyg.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/211024PsiCyg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and ruddy, fairly wide, ~4" 2 delta mag.
BU1475 & HDO155 BU1475 AB 7m.8 9m.5 10.4" 113° 2015 Aql 19h57m53.70s / -09°03'30.30"
HDO155 AC 7m.8 8m.7 115.1" 119° 2015
BU1475 CD 8m.7 11m.1 4.9" 163° 2015
René Merting
Drachhausen (Germany)
15x56 HDO155 (AC): ein weit auseinander stehendes Pärchen - Komponente B im Südosten ist halb so hell wie A
René Merting
Drachhausen (Germany)
76mm (29x) BU1475 (AB): bereits bei 29x ist B knapp abgesetzt südöstlich von A erkennbar - A ist schön weiß und B ist im Grunde so schwach (gut 1.5 mag schwächer), dass der Stern kupferbraun strahlt
Uwe Pilz
Leipzig (Germany)
320mm (121x) ../projects/double-stars/uwe-pilz/sketches/211001_BU1475.jpg
★★ STF2606 AB 7m.7 8m.4 0.7" 147° 2018 Cyg 19h58m32.66s / +33°16'38.80"

../images/binary-star-orbits/STF2606-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr schwierig, Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STF2606.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Hair split to clean split when seeing stills and there is only an airy disk. Near equal, half a delta mag. ~0.8"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Close pair 2 delta mag.
STT395, 16 Vul 5m.8 6m.2 0.7" 129° 2020 Vul 20h02m01.45s / +24°56'16.80"

../images/binary-star-orbits/STT395-orbit.jpg

Mark McCarthy
Fremont (California/USA)
152mm (456x) Slightly unequal snowman at all powers. Notching increases in strength with increasing power. Physical with 1201-year period
Mark McCarthy
Fremont (California/USA)
203mm (667x) 16 Vul. Hairline split at 8" 333x. At 667x I see a more definite split. It appears only half delta mag, rather than the 1 delta mag in Sky Tools. Nice star.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) fast getrennt, eher 8, ähnlich hell ../projects/double-stars/frederik-wanink/sketches/16Vul.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/16%20Vul.jpg
★★ SHJ314, V1676 Cyg AF 6m.8 7m.3 36.3" 28° 2019 Cyg 20h05m57.32s / +35°47'18.20"
AD 6m.8 9m.5 11.3" 300° 2019
René Merting
Drachhausen (Germany)
100mm (32x) AD: bei 32x ist westlich von A knapp getrennt ein sehr schwacher Lichtpunkt erkennbar - mindestens 3 Größenklassen Helligkeitsunterschied zwischen A und D - zurück auf 20x sind beide Sterne auch noch ganz knapp getrennt erkennbar
AF: bei 32x sind zwei weit auseinander stehende Sterne erkennbar, Komponente F im NO ist nur unwesentlich schwächer und strahlt nicht ganz so klar wie A
Uwe Pilz
Leipzig (Germany)
105mm (144x) liegt gemeinsam mit SHJ 315 im OC NGC 6871. Die Zeichnung des gesamten Haufens enthält nur die hellsten Sterne. ../projects/double-stars/uwe-pilz/sketches/190726shj314_315.jpg
STF2644 6m.9 7m.1 2.6" 206° 2019 Aql 20h12m35.09s / +00°52'00.20"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Very tight at 57x, but separable without noticeable difference in brightness. At 100x very small difference in brightness visible. The colors of both components appeared to be the same, but not clearly perceptible.
Stefan Loibl
Rosenheim (Germany)
102mm (102x) both components white at 102x, companion appears slightly reddish at 205x
Mark McCarthy
Fremont (California/USA)
203mm (333x) Close white stars, near equal, ~2.5"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell, leicht ../projects/double-stars/frederik-wanink/sketches/STF2644.jpg
★★★ STFA50, 30/31 Cyg, omicron Cyg AD 3m.9 4m.8 336.7" 322° 2016 Cyg 20h13m37.90s / +46°44'28.80"
AC 3m.9 7m.0 108.6" 173° 2016
Robert Zebahl
Leipzig (Germany)
naked eye AD: Well split with noticeable difference in brightness.
Christopher Hay
Seeheim (Germany)
3x63 AD: Self-built binoculars, hence the unusual specification.
Widely split, A (31 Cyg) light orange, D (30 Cyg) light blue.
Christopher Hay
Seeheim (Germany)
7x50 A-D: Widely split, A (31 Cyg) luminous orange-red, D (30 Cyg) luminous ice-blue. C set off from A as a fine speck of light.
Robert Zebahl
Leipzig (Germany)
8x40 AD: Wonderful double star for binoculars. Large distance of the components, brighter once (31 Cyg) appeared slightly orange, the fainter (Cyg 30) more bluish.
Robert Zebahl
Leipzig (Germany)
8x40 AC: Observation at full moon. Easily split with big difference in brightness. Brighter component slightly orange. C component rather faint.
Christopher Hay
Seeheim (Germany)
15x45 A-D: Very wide apart but still perceived as belonging together. A (31 Cyg) orange-red, D (30 Cyg) ice-blue. C well set off from A and light ice-blue, like an echo of D. A delightful group of three for binoculars at this power, further accentuated by nearby orange Omicron2 Cygni. Both the brightnesses and colour hues of Omi1A and Omi2 appear practically identical.
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-03: Fantastic sight. A: bright orange, D: white-bluish, C: light blue. Very beautiful field.
René Merting
Drachhausen (Germany)
18x70 wunderschön - Komponente A präsentiert sich buttergelb - die südliche, schwächste Komponente C zeigt sich aquamarinblau - D im Norden ist reinweiß und steht dreimal weitere entfernt wie AC
Robert Zebahl
Leipzig (Germany)
80mm (25x) AC: Similar to the observation with binoculars. C component appeared bluish and gave good contrast to the orange colored 31 Cyg.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x sind alle drei Sterne weit getrennt und doch irgendwie zusammengehörend, Komponente A ist rapsgelb und am auffälligsten, Komponente D strahlt weiß und die schwächste Komponente C schimmert bläulich, schöner Anblick
Robert Zebahl
Leipzig (Germany)
102mm (28x) Bright, wide apart and wonderful contrast in color. A: light yellowish-orange, C: blue, D: light blue. ../projects/double-stars/robert-zebahl/sketches/2019-08-22_omicron_cyg.jpg
Sarah Gebauer
Germany
150mm (30x) die drei Komponenten plus Omicron2 bilden ein wunderschönes, sehr langes und spitzes Dreieck und zeigen dabei wundervolle Farben, Komponente A von o1 sowie o2 erscheinen schön gelblich, Komponente D von o1 hat einen deutlichen Blaustich im Weißen, wirklich ein sehr schönes Gesamtbild - auf Komponente C hatte ich nicht geachtet ../projects/double-stars/sarah-gebauer/sketches/20200731%20Omicron%20Cyg%20DSk.jpg
Sarah Gebauer
Germany
150mm (85x) dieses Mal nur die drei dicht beieinanderstehenden Komponenten A, C und D im Sichtfeld gehabt, Komponente A ist wieder deutlich gelbgold, C wirkt leicht bläulich und Komponente D wirkt dieses Mal eher weiß ../projects/double-stars/sarah-gebauer/sketches/20200805%20Omicron%20Cyg%20DSk.jpg
STF2658 AB 7m.2 9m.4 5.2" 106° 2020 Cyg 20h13m40.74s / +53°07'30.30"

../images/binary-star-orbits/STF2658-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) bei 107x ist Komponente B schwach erkennbar östlich von A, es ist schon ordentlich Luft zwischen den beiden - Helligkeitsunterschied 2 Magnituden
Uwe Pilz
Leipzig (Germany)
105mm (144x) orangegelb ../projects/double-stars/uwe-pilz/sketches/190726STF2658.jpg
Uwe Pilz
Leipzig (Germany)
320mm (225x) ../projects/double-stars/uwe-pilz/sketches/211109stf2658.jpg
STT403 & STF2657 STT403 AB 7m.3 7m.6 0.9" 171° 2019 Cyg 20h14m21.53s / +42°06'15.60"
STF2657 AC 7m.3 9m.8 11.6" 32° 2015
René Merting
Drachhausen (Germany)
100mm (64x) STF2657 (AC): bei 64x zeigt sich C ganz schwach nordöstlich von A - mindestens 2 Größenklassen Helligkeitsunterschied - A ist reinweiß, bei C bin ich froh, dass ich C überhaupt erkennen kann
Uwe Pilz
Leipzig (Germany)
105mm (288x) STT403 (AB): schwierig
Mark McCarthy
Fremont (California/USA)
152mm (175x) STT403 (AB): Near equal hairline split, white, 2 delta mag. Fainter C (STF 2657 AC) well split nearby. WDS uncertain but there is 26% parallax range overlap, 372 AU weighted separation, and high 3.54/3.29 solar mass, so very likely gravitational
Robert Zebahl
Leipzig (Germany)
152mm (270x) STT403 (AB): At 129x clearly elongated, notched. At 270x clearly split, but very tight with almost touching diffraction disks. Visible, but very small difference in brightness. Inconspicuous color.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STT403 (AB): schwaches 3er System, getrennt ../projects/double-stars/frederik-wanink/sketches/STT403.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STT403 (AB): Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)
Mark McCarthy
Fremont (California/USA)
317mm (553x) STT403 (AB): Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)
Frederik Wanink
Itterbeck (Germany)
254mm STT403 (AB) ../projects/double-stars/frederik-wanink/photographs/STT%20403%20AB.jpg
STT404 AB 7m.6 9m.8 28.5" 115° 2015 Cyg 20h15m49.33s / +52°30'08.20"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein weit getrenntes Pärchen - Komponente B ist schwach als grauer Punkt erkennbar, A nordwestlich davon ist leicht gelblich - zurück auf 20x hat A weiterhin einen Farbstich und B sieht aus wie ein Nadelstich, das Paar ist gut getrennt
Uwe Pilz
Leipzig (Germany)
320mm (45x) ../projects/double-stars/uwe-pilz/sketches/211109stt404.jpg
STF2671 AB 6m.0 7m.5 3.7" 337° 2017 Cyg 20h18m24.76s / +55°23'49.80"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Pretty tight with a clear difference in brightness. I couldn't see anything conspicuous regarding colors.
Mark McCarthy
Fremont (California/USA)
152mm (175x) Cream white A and light yellow, 1 delta mag B, well separated. WDS uncertain, however there is 12% parallax overlap, 337 AU weighted separation, good 2.32/1.74 solar mass, so it likely is gravitationally bound
Uwe Pilz
Leipzig (Germany)
320mm (225x) ../projects/double-stars/uwe-pilz/sketches/211109stf2671.jpg
STF2664 8m.1 8m.3 27.8" 322° 2019 Del 20h19m38.48s / +13°00'17.20"
René Merting
Drachhausen (Germany)
10x50 zwei gleich helle Sterne in Südost-Nordwest-Ausrichtung - Trennung eindeutig, aber sehr knapp
Robert Zebahl
Leipzig (Germany)
16x70 2020-08-19: Well separated with a clear, but not too wide separation. Slightly different in color, with the southern component appearing slightly cooler. Beautiful surrounding field.
Robert Zebahl
Leipzig (Germany)
16x70 2021-09-02: Quite conspicuous as a double star, moderately bright with very little difference in brightness. Slightly orange & white-bluish.
Uwe Pilz
Leipzig (Germany)
16x70 ../projects/double-stars/uwe-pilz/sketches/200918stf2664.jpg
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x sehr weit getrennt - trotz der großen Trennung auffällig, da kaum weitere Sterne im unmittelbaren Umfeld stehen - Komponente B im NW ist nicht viel schwächer als A - zurück auf 20x ist der Abstand zwischen beiden Sternen immer noch sehr groß
Mark McCarthy
Fremont (California/USA)
152mm (285x) Wide, white, slight magnitude difference
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist einfach zu trennen, mit sehr leichtem Helligkeitsunterschied. Komponente A leuchtet leicht gelblich und Komponente B geht ins bläuliche.
★★★ BLL49, U Cyg 8m.0 9m.0 65.4" 231° 2015 Cyg 20h19m41.66s / +47°54'19.90"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-03: Easy split with very good color contrast: white and clear orange.
Robert Zebahl
Leipzig (Germany)
102mm (28x) 2019-08-22: While the primary component appears quite unspectacular in a white, the companion U Cygni is much more interesting. It is a carbon star whose brightness varies between 5m9 and 12m1 with a period of about 463 days. It appears in mostly intensely orange, and even deep red in the towards its minimum. Extremely rewarding! ../projects/double-stars/robert-zebahl/sketches/2019-08-22_u_cyg.jpg
★★ STF2681 AB 8m.0 10m.6 6.8" 39° 2015 Cyg 20h22m49.54s / +53°25'02.80"
AC 8m.0 8m.9 38.2" 199° 2015
AD 8m.0 11m.8 42.0" 166° 2015
CD 8m.9 11m.8 23.3" 101° 2015
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x gut getrenntes Pärchen, Komponente A nördlich strahlt doppelt so hell wie B im Süden, auf C nicht geachtet
Uwe Pilz
Leipzig (Germany)
105mm (144x) Auf den ersten Blick sah ich nur A und C, aber D war auch kein Problem. B war nur blickweise zu erkennen. ../projects/double-stars/uwe-pilz/sketches/211024STF2681.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice. 3x fainter B, ~4", another wide pair below. (4 stars in system.)
Uwe Pilz
Leipzig (Germany)
320mm (225x) ../projects/double-stars/uwe-pilz/sketches/211109stf2681.jpg
STF2679 AB 7m.9 9m.7 24.7" 77° 2019 Del 20h24m22.59s / +19°34'30.00"
AC 7m.9 11m.6 38.6" 150° 2017
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2021-09-02: Easy to separate with still moderate separation and rather large difference in brightness. Located in a star rich field.
Uwe Pilz
Leipzig (Germany)
16x70 AB: Sichtung unsicher ../projects/double-stars/uwe-pilz/sketches/200918stf2679.jpg
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x ist Komponente B im Osten von A relativ weit getrennt erkennbar - Komponente B ist sehr schwach und gut 1.5 Magnituden schwächer als A - zurück auf 20x ist B nur noch ganz knapp erkennbar, aber weiterhin mit ordentlichem Abstand zu A
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Doppelstern ist einfach zu trennen und auch der Helligkeitsunterschied von gut 2,0 mag ist sehr auffällig. AC: Sehr einfacher, hier ist die Komponente C mit nur 11,6 mag die Herausforderung. A leuchtet gelblich
FRK9 8m.4 9m.0 59.8" 238° 2015 Cyg 20h26m21.52s / +54°01'32.60"
Uwe Pilz
Leipzig (Germany)
320mm (45x) ../projects/double-stars/uwe-pilz/sketches/211109frk9.jpg
STF2693 8m.2 9m.2 13.7" 12° 2016 Cyg 20h28m24.22s / +54°30'05.40"
Uwe Pilz
Leipzig (Germany)
320mm (45x) ../projects/double-stars/uwe-pilz/sketches/211109sttf2693.jpg
★★ WEI35 AB 8m.3 8m.8 4.2" 214° 2020 Cyg 20h29m13.54s / +37°30'45.80"
AC 8m.3 9m.4 87.6" 100° 2015
CD 9m.4 10m.6 12.1" 202° 2018
René Merting
Drachhausen (Germany)
100mm (64x) AB: bei 64x ist ein schön eng stehendes Paar zweier schwacher Sterne erkennbar - Komponente B im SW schwächelt helligkeitstechnisch nur um eine halbe Magnitude gegenüber A - Komponente A wirkt leicht farbig, das aber ist nicht greifbar
Uwe Pilz
Leipzig (Germany)
105mm (200x) eine anderer doppelter Doppelstern! Lohnend! Es ist erstaunlich, dass er nicht in den klassischen Katalogen auftaucht ../projects/double-stars/uwe-pilz/sketches/190726wei35.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Double-double! Near equal 3", and closeby a wider pair, 5", 1 delta mag. (AB is first, CD might be second? 4 stars visible in system)
STF2691 8m.1 8m.4 16.3" 32° 2019 Cyg 20h29m43.18s / +38°07'31.50"
Robert Zebahl
Leipzig (Germany)
16x70 2020-08-19: Nicely separated and in one field of view together with 40 Cygni and Messier 29. Moderate distance and brightness difference, relatively conspicuous even though the environment is rather rich in stars.
René Merting
Drachhausen (Germany)
18x70 das Paar ist genau richtig für 18-fache Vergrößerung - ein schön isoliert stehendes, knapp getrenntes Sterndoppel zweier gleichheller Protagonisten - Komponente B im NO ist nur unwesentlich schwächer
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-07-29: At 22x clearly separated with little difference in brightness. Colorwise the components appeared different: yellowish-orange & bluish. The color impression was a bit more intensive at 44x: slightly orange & bluish.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x ein schönes knapp getrenntes Pärchen aus zwei schwächeren Sternen - Komponente A im Süden ist nur unwesentlich heller als B - bei 32x leichter Farbkontrast, weil A warm-weiß strahlt
Uwe Pilz
Leipzig (Germany)
105mm (53x) schon bei 22x auffallend ../projects/double-stars/uwe-pilz/sketches/190726stf2691.jpg
BU63, 1 Del AB 6m.2 8m.0 0.9" 347° 2016 Del 20h30m17.95s / +10°53'45.30"
Sarah Gebauer
Germany
100mm (136x) auch bei 136x nicht zu trennen, bei 0,9'' Distanz und Amiciprisma aber auch kein Wunder
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig ../projects/double-stars/frederik-wanink/sketches/1Del.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 1 Delphini: 1 disk split to the NNW when seeing stills. A tough observation. 1 Del is a fascinating star that spins once in 0.9 earth days! See http://stars.astro.illinois.edu/sow/1del.html.
Mark McCarthy
Fremont (California/USA)
508mm (533x) 1 Del. B seen within A's diffraction at 533x and apodising mask, <1", ~2 delta
STF2690 & HJ269 & DA1 STF2690 A-BC 7m.1 7m.4 17.8" 255° 2020 Del 20h31m11.94s / +11°15'33.70"
HJ269 AD 7m.1 12m.1 23.0" 108° 2016
DA1 BC 7m.9 8m.0 0.3" 184° 2016

../images/binary-star-orbits/DA1-BC-orbit.jpg

René Merting
Drachhausen (Germany)
10x50 STF2690 (A-BC): ein ganz enges Sternpaar mit zwei gleich hellen Sternen - ich würde beide als 8 mit tiefer Einschnürung bezeichnen, also kurz vor der Trennung
Robert Zebahl
Leipzig (Germany)
12x42 STF2690 (A-BC): 2021-10-09: Very nice. Clearly separated with almost equally bright components.
René Merting
Drachhausen (Germany)
12x42 STF2690 (A-BC): ein superenges, schönes Paar gleich heller Sterne - da passen maximal eineinhalb Blatt Papier zwischen - schön im Zusammenspiel mit den beiden hellen Sternen südöstlich und südwestlich
Robert Zebahl
Leipzig (Germany)
16x70 STF2690 (A-BC): 2020-08-19: Striking, moderately bright with nice separation of the similarly bright components in nice environment. The eastern component seemed slightly brighter and colorwise cooler.
Uwe Pilz
Leipzig (Germany)
16x70 STF2690 (A-BC) ../projects/double-stars/uwe-pilz/sketches/200918stf2690.jpg
Uwe Pilz
Leipzig (Germany)
16x70 STF2690 (A-BC): etwa gleichhell, sauber getrennt
René Merting
Drachhausen (Germany)
100mm (20x) STF2690 (A-BC): bei 32x ein schön getrenntes Sternpaar mit leichtem Farbkontrast - Komponente A im Osten ist weiß, BC im Westen ist leicht gelblich und dumpfer, aber kaum ein Helligkeitsunterschied zwischen beiden Sternen - zurück auf 20x ist das Paar noch schöner anzusehen, weil beide Sterne dichter zusammen stehen
Sarah Gebauer
Germany
100mm (49x) STF2690 (A-BC): weit getrennt, zwei simple Glupschäuglein im Leeren, mehr nicht
Robert Zebahl
Leipzig (Germany)
102mm (28x) STF2690 (A-BC): 2021-09-11: Very attractive, almost equally bright with subtle color contrast: pale yellow-orange & white-bluish.
Robert Zebahl
Leipzig (Germany)
152mm (30x) STF2690 (A-BC): 2021-09-08: Striking in nice star environment, easy to separate with little difference in brightness. Both components appeared slightly yellowish.
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF2690 (A-BC): Widely separated near equal white stars.
Mark McCarthy
Fremont (California/USA)
508mm (533x) DA1 (BC): This is part of STF 2690 A-BC, which is a white, wide, near equal, pair (7.12/7.39 17.7") observed with 8-inch at 205x. I suspected BC at 8-inch 333x, & had overlapping disks with 8-inch 533x. With 20-inch 533x I see a hairline split, slight magnitude difference. Seeing is not supporting it well, but it's clear. Very nice. Dawes discovered in 1840 at 0.7" -- DA 1 was discovered when Dawes was working at "Mr Bishop's observatory" in London, from 1839 to 1844. It had a 7-inch refractor by Dollond (1836) who had made both mounting and telescope. So at current 0.369" it's not surprising I only had overlapping disks at 8-inch. It's a physical pair, with a 236.52 year period, and will widen another 0.1" in the next 15 years
Karsten Kopp
Köln (Germany)
600mm (180x) STF2690 (A-BC): STF 2690: Gut zu trennender Doppelstern mit leichtem Helligkeitsunterschied. Komponente A leuchtet weiß und die Komponente B geht ins gelbliche.
★★ STF2703 AB 8m.3 8m.4 25.1" 290° 2019 Del 20h36m49.41s / +14°43'42.40"
AC 8m.3 8m.8 77.8" 234° 2016
AD 8m.3 12m.8 84.7" 347° 2016
BC 8m.4 8m.8 67.0" 215° 2016
René Merting
Drachhausen (Germany)
12x42 AB: flüchtig betrachtet erst übersehen (C im Südwesten hat etwas abgelenkt), aber bei genauem Hinschauen ist zu erkennen, dass die nordöstliche Komponente aus zwei gleich hellen Sternen besteht
AC: die südwestliche Komponente hat dreifachen Abstand wie AB
Robert Zebahl
Leipzig (Germany)
16x70 2020-08-19: Immediately eye-catching multiple star located between beta and zeta Delphini. Components A, B & C are very easily seen as a triple system forming a striking triangle. A very slight difference in brightness between A & B is perceptible, as well as a color difference, though I cannot name any colors. Very nice.
Uwe Pilz
Leipzig (Germany)
16x70 AB ../projects/double-stars/uwe-pilz/sketches/200918stf2703.jpg
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x einfach - Komponente B im Westen ist nur minimal schwächer
BC: bei 20x ist Komponente C südwestlich von B in mehr als dem doppeltem Abstand von A zu B erkennbar, Helligkeitsunterschied gut eine halbe Größenklasse
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB ../projects/double-stars/uwe-pilz/sketches/200804stf2703.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Sehr schönes Mehrfachsternsystem. AB mit fast identische Helligkeit, wobei Komponente C mit 0,5 mag etwas schwächer ist. Ansonsten sind AB,AC und BC als auffälliges Dreieck leicht zu trennen. AD: Hier ist die Komponente D eine sehr große Herausforderung, die ich nur mit indirektem aus der Stadt heraus sichten konnte. ../projects/double-stars/karsten-kopp/sketches/STF2703.jpg ../projects/double-stars/karsten-kopp/sketches/STF2703%20-%20beschriftet.jpg
Karsten Kopp
Köln (Germany)
140mm Image taken with TEC 140, Canon 700Da, 4 seconds exposure time ../projects/double-stars/karsten-kopp/photographs/STF2703%20-%2027.10.2021.jpg
STT410 AB 6m.7 6m.8 0.9" 2018 Cyg 20h39m33.31s / +40°34'46.80"
AB-C 6m.8 8m.7 68.6" 70° 2018
AB-D 6m.8 10m.0 106.6" 327° 2018

../images/binary-star-orbits/STT410-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) AB: nur mäßig schwierig, Abstand 0“87
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: nicht getrennt ../projects/double-stars/uwe-pilz/sketches/stt410.jpg
Robert Zebahl
Leipzig (Germany)
152mm (240x) AB: 2022-08-07: Two clearly visible diffraction disks that slightly touch each other. In a few moments a hint of separation is possible. A very slight difference in brightness can be seen at times.
Mark McCarthy
Fremont (California/USA)
152mm (245x) AB: Near equal, hairline split at best moments at 175x, good split at 245x. Blue-white stars with perfect airy disks! Physical with 1152-year period, is is nearing periastron and will make a relatively quick turn around the primary in the coming decades
Robert Zebahl
Leipzig (Germany)
152mm (270x) All four components easily visible. The pair AB shows two clear, equally bright, overlapping diffraction disks. ../projects/double-stars/robert-zebahl/sketches/2019-09-06_stt410.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: gleich hell, getrennt ../projects/double-stars/frederik-wanink/sketches/STT410.jpg
STF2718 AB 8m.3 8m.4 8.5" 87° 2020 Del 20h42m33.47s / +12°43'41.90"
AC 8m.3 9m.0 167.2" 346° 2015
BC 8m.4 9m.0 167.3" 346° 2015
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2021-09-02: Appears elongated at first glance, on closer observation just separable. A very small difference in brightness is visible. The double star is located in a beautiful surrounding field of stars.
René Merting
Drachhausen (Germany)
100mm (32x) AB: der Doppelstern steht sehenswert in einem Bogen aus 5 Sternen - bei 32x werden zwei gleich helle knapp getrennte Sterne sichtbar - schwer zu sagen, welches die A-Komponente ist - die westliche Komponente wirkt im Weiß-Farbton etwas kühler
Sarah Gebauer
Germany
100mm (80x) AB: wie der oberste Stern in einer Wiege, nordwestlich dieser Wiege ist noch eine weitere geschwungene Sternlinie zu sehen, sehr schön ../projects/double-stars/sarah-gebauer/sketches/STF2718.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Easy wide, white, near equal Psychical
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Same brightness white pair.
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Doppelstern ist sehr einfach zu trennen mit gleicher Helligkeit. Beide Komponenten erstrahlen weißlich.
★★ STF2725 AB 7m.5 8m.2 6.2" 12° 2019 Del 20h46m13.31s / +15°54'26.40"

../images/binary-star-orbits/STF2725-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
16x70 2021-09-02: The double star appears clearly elongated at the correct position angle, but nothing more.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schöner Kontrast zum 15' nördlich stehenden viel helleren Sternpaar STF2727 - hier bei dem wesentlich schwächeren Sternpaar zeigt sich bei 32x die Komponente B knapp getrennt nördlich von A - Helligkeitsunterschied etwas mehr als eine halbe Magnitude, aber Komponente A ist noch deutlich schwächer als die Komponente B von STF2727
Sarah Gebauer
Germany
100mm (45x) das Doppel lässt sich bei 45x sauber trennen und bildet mit Gamma2 Delphini ein optisches Doppel-Doppel, da beide Doppelsterne sehr gut in ein Gesichtsfeld passen ../projects/double-stars/sarah-gebauer/sketches/Gamma%20Del%20STF2725.jpg
Uwe Pilz
Leipzig (Germany)
105mm (66x) im selben Feld mit gamma Del
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/191030gammaDel.jpg
Robert Zebahl
Leipzig (Germany)
152mm (30x) 2021-09-11: Separated but still very close components with moderate brightness difference.
Mark McCarthy
Fremont (California/USA)
203mm (205x) OR Del. Light yellow stars, half delta mag, wide. Physical pair with a 2945.18 year period. In same field with bright pair STF 2727
Mark McCarthy
Fremont (California/USA)
317mm (553x) Super wide, 1 magnitude difference, both faint yellow-white.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy, half delta mag and wide. I was after the super close WSI 110 Aa-Ab 0.1" but had no hope of seeing it.
Karsten Kopp
Köln (Germany)
600mm (180x) Leicht zu trennender Doppelstern mit leichtem Helligkeitsunterschied von ca. 0,5 mag. Komponente A leuchtet weißlich und die Komponente B b gelblich.
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/STF%202725.png
★★ STF2727, 12 Del, gamma Del AB 4m.4 5m.0 8.8" 266° 2020 Del 20h46m39.50s / +16°07'27.40"

../images/binary-star-orbits/STF2727-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
8x42 On tripod. Definite elongation, and eastern end of elongation (i.e. component A) is definitely brighter than the other end. PA estimated at 240° without prior knowledge.
Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. A very elongated figure-8 very close to popping apart. According to Stelledoppie a physical double with a period of 3249 years. Observed in June 2019 when separation was 8,89“. Will be 8.67“ in 2030 according to Stelledoppie.
Robert Zebahl
Leipzig (Germany)
16x70 2021-09-02: Beautiful sight in very nice surrounding. Easy to split, but quite small separation. A rather small difference in brightness is clearly visible. The primary component appears golden in color.
Christopher Hay
Seeheim (Germany)
18x80 Very tight pair but clearly split with black in-between. Observed in July 2019 when separation was 8,89“. An excellent object to test the resolution of large binoculars. Struve 2725 a few arcminutes to the southwest is a further good test object for magnifications >20x.
Christopher Hay
Seeheim (Germany)
40x80 Widely split, visually strong, dominating the field of view. Component A appears yellowish compared to component B. Struve 2725 in same FOV finely split.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x knapp getrennt - Komponente A ist schön gelb, B im Westen ist gut 1.5 Magnituden schwächer (lt. Stelle Doppie Helligkeitsunterschied nur 0.67 mag) - zusammen mit dem wesentlich schwächeren STF2725 gut 15' südlich sehenswert
Sarah Gebauer
Germany
100mm (45x) bei 45x sauber getrennt und zusammen mit dem DS STF 2725 in einem Gesichtsfeld, dadurch wirken sie wie ein optisches Doppel-Doppel, sehr schön! Beide DS bilden auch einen auffälligen Lichthof ../projects/double-stars/sarah-gebauer/sketches/Gamma%20Del%20STF2725.jpg
Uwe Pilz
Leipzig (Germany)
105mm (66x) im selben Feld mit STF2725 ../projects/double-stars/uwe-pilz/sketches/gammaDel.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) schon trennbar bei 26x. In einem Feld mit STF2725 ../projects/double-stars/uwe-pilz/sketches/191030gammaDel.jpg
Robert Zebahl
Leipzig (Germany)
152mm (30x) 2021-09-11: Difference in brightness well visible. Light yellow/golden & lemon yellow.
Mark McCarthy
Fremont (California/USA)
152mm (175x) Gam2 Del. Gorgeous, light yellow-orange A and blue-green B, I like this better than Albireo. Physical with 3249-year period, it will slowly tighten the next couple of hundred years
Mark McCarthy
Fremont (California/USA)
152mm (285x) Gam 2 Del. ! Most beautiful light orange-yellow A and ~1 delta mag blue-green B
Mark McCarthy
Fremont (California/USA)
317mm (277x) Gamma Delphinus. Rich gold-yellow A, blue-white B, ~6" separation estimated by eye. Very pretty pair.
Karsten Kopp
Köln (Germany)
600mm (180x) Recht heller und auch leicht zu trennender Doppelstern mit ca. 0,5 mag Helligkeitsunterschied. Komponente A leuchtet schön gelblich und Komponente B weiß.
STT413, 54 Cyg, lambda Cyg AB 4m.7 6m.3 0.9" 2020 Cyg 20h47m24.53s / +36°29'26.70"

../images/binary-star-orbits/STT413-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (280x) The diffraction disk of the primary component was slightly elongated towards north. The air here was however a bit too unsteady for an accurate observation.
Uwe Pilz
Leipzig (Germany)
105mm schwierig ../projects/double-stars/uwe-pilz/sketches/lambdaCyg.jpg
Mark McCarthy
Fremont (California/USA)
152mm (175x) Very unequal mag snowman. Physical with an 800-year period
Robert Zebahl
Leipzig (Germany)
152mm (300x) Observation with an achromat. The fainter component was visible as a permanent brightening of the first diffraction ring.
Robert Zebahl
Leipzig (Germany)
152mm (300x) 2020-08-24: Observation with an ED refractor. At 171x partially, at 200x clearly visible as '8'. At 300x two clear, overlapping diffraction disks of differently bright components.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig aber getrennt ../projects/double-stars/frederik-wanink/sketches/LambdaCyg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Lambda Cyg: ~1.5 delta mag, blue-white. Bright mess resolves to two disks 0.8-1.0", with seeing.
BU65, 13 Del 5m.6 8m.2 1.5" 200° 2016 Del 20h47m48.33s / +06°00'29.50"
Uwe Pilz
Leipzig (Germany)
105mm (288x) ../projects/double-stars/uwe-pilz/sketches/190823_13del.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) 13 Del. Suspected at 333x, went up to 533x. The B star seems much fainter about 3 delta mag, and seen only when seeing is still as a blue point just outside first diffraction. ~1.5"
BU155 AB 7m.4 8m.1 0.7" 41° 2018 Cyg 20h51m05.41s / +51°25'01.70"
AC 7m.4 12m.6 14.8" 40° 2015
AD 7m.4 11m.5 191.8" 48° 2015

../images/binary-star-orbits/BU155-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (300x) AB: 2022-08-07: At 200x slightly elongated, at 240x clearly elongated, at 300x slightly notched in steady moments.
Mark McCarthy
Fremont (California/USA)
152mm (380x) AB: Can tell it is not single ay 175x, and appears slightly notched at 245x. Strongly notched but not split at 380x. WDS physical with a 764-year period, unfortunately there is no parallax data for the companion. Burnham discovered with his 6-inch at 0.6" and notes "A fine pair, but no material change." He does not say whether he split it, though to do so would require a night of exceptional seeing to carry high magnification. Dembowski -- who had a 7-inch -- must also have had a good night to be able to put it under the wire for measurement. The thing about Burnham is he was a very attentive observer, I could imagine many others passing this over had they not studied the airy disk carefully
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/BU155.jpg
STT417 AB 8m.2 8m.4 0.9" 28° 2018 Vul 20h53m04.23s / +29°08'43.70"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach ../projects/double-stars/frederik-wanink/sketches/STT417.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20417%20AB.jpg
STT418 8m.2 8m.3 0.9" 284° 2018 Cyg 20h54m49.84s / +32°42'23.20"

../images/binary-star-orbits/STT418-orbit.jpg

Mark McCarthy
Fremont (California/USA)
152mm (285x) Incredibly fine split, near equa