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 266
Visual Observations 854
Sketches 334
Photographs 16
Observers 12
Berthold Fuchs, Sarah Gebauer, Christopher Hay, Jens Leich, Stefan Loibl, Mark McCarthy, Rene Merting, Uwe Pilz, John Raymond, Joerg S. Schlimmer, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000)
★★★ STTA254, WZ Cas AB 7m4 8m3 57.8'' 89° 2018 Cas 00h01m15.85s +60°21'19.00"
AC 7m4 9m6 155.4'' 324° 2015
AD 7m4 10m3 181.4'' 118° 2016
Rene Merting
Drachhausen (Germany)
16x70 AB: ein schöner Fernglas-Doppelstern - Komponente A im Westen präsentiert sich dunkel-gelb (noch nicht orange), B im Osten ist eher weißlich
Robert Zebahl
Leipzig (Germany)
80mm (33x) AB: Nice double star. Brighter component appeared orange, the fainter more bluish.
Rene 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
Joerg 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.
Rene 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
STT547 AB 9m0 9m2 6.0'' 190° 2018 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

Rene 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 6m4 7m3 1.5'' 2018 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.
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.)
Rene 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 6m7 6m9 0.9'' 17° 2018 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
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2.jpg
STF3 7m8 9m1 5.0'' 83° 2016 And 00h10m03.18s +46°23'25.10"
Rene 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 7m3 8m3 1.9'' 290° 2018 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)
317mm (553x) Tight yellow-white pair, near equal magnitudes.
Mark McCarthy
Fremont (California/USA)
508mm (205x) Orange star, slightly out of round.
HJ5451 6m0 9m3 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)
317mm (553x) Orange, pretty bright star, bluish / fainter widely separated B
H5 17, pi And AB 4m4 7m1 35.8'' 174° 2018 And 00h36m52.84s +33°43'09.70"
Uwe Pilz
Leipzig (Germany)
105mm (88x) (HV 17) blauweiß und violett-grau ../projects/double-stars/uwe-pilz/sketches/191122HV17.jpg
STFA1 AB 7m2 7m4 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.
★★★ eta Cas, 24 Cas STF60 AB 3m5 7m4 13.4'' 326° 2019 Cas 00h49m06.29s +57°48'54.70"
STF60 AC 3m5 11m4 225.0'' 260° 2000
STF60 AD 3m5 12m8 189.4'' 354° 2011
STF60 AE 3m5 10m2 75.6'' 126° 2015
STF60 AF 3m5 11m5 378.3'' 276° 2000
STF60 AG 3m5 9m5 419.7'' 259° 2012
STF60 AH 3m5 8m4 701.1'' 355° 2012
SMR2 AI 3m5 11m6 90.3'' 73° 2012
SMR2 AJ 3m5 12m3 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.
Rene Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist Komponente A so hell, dass B trotz des augenscheinlich großen Abstandes von 13,38" 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
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice yellow pair. A is a red tainted yellow, B is cleaner.
Rene 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 6m1 6m5 1.1'' 334° 2018 And 00h54m58.02s +23°37'42.40"
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
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
BU235 Aa-Ab 7m5 7m8 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
STF96 7m9 8m9 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.
STF155 AB 7m9 8m0 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"
1 Ari, STF174 6m3 7m2 2.9'' 165° 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.
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".
H5 12, 9 Ari, lambda Ari AB 4m8 6m7 37.3'' 48° 2018 Ari 01h57m55.71s +23°35'45.80"
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
alpha Psc, 113 Psc, Alrischa, Kaitain, Okda STF202 AB 4m1 5m2 1.8'' 262° 2017 Psc 02h02m02.80s +02°45'49.40"
PWL1 AC 4m1 8m2 404.9'' 63° 2006
PWL1 AD 4m1 8m6 434.5'' 335° 2006

../images/binary-star-orbits/STF202-AB-orbit.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 5m8 7m9 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)
203mm (533x) 10 Ari Pretty white and slightly off-white or blue-white B, 2.5 delta mag, ~1.5"
Mark McCarthy
Fremont (California/USA)
317mm (553x) ~2 delta mag, ~1" very nice. ~1 disk split. Nice!
★★★ STF227, iota Tri, 6 Tri 5m3 6m7 3.7'' 69° 2016 Tri 02h12m22.28s +30°18'11.10"
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
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
★★★ STF231, 66 Cet AB 5m7 7m7 16.8'' 235° 2018 Cet 02h12m47.54s -02°23'37.10"
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und leuchtend rot! ../projects/double-stars/uwe-pilz/sketches/191129_66Cet.jpg
★★ STF262, iota Cas AB 4m6 6m9 2.9'' 230° 2017 Cas 02h29m03.96s +67°24'08.70"
AC 4m6 9m1 6.7'' 117° 2015
AD 4m6 8m5 210.9'' 60° 2016

../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
Rene 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
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-blueish and obviously fainter than B. Grand sight at 129x!
★★ 30 Ari STFA5 AB 6m5 7m0 37.9'' 275° 2018 Ari 02h37m00.52s +24°38'50.00"
RAO8 BC 7m0 11m0 0.6'' 282° 2018
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 7m7 7m5 3.4'' 118° 2017 Ari 02h41m06.59s +18°48'00.70"
AC 7m7 9m5 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
STF295, 84 Cet 5m8 9m7 3.6'' 301° 2012 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 3m5 6m2 2.0'' 299° 2015 Cet 02h43m18.04s +03°14'08.90"
ALD124 AC 3m5 10m2 843.1'' 306° 2000
Rene 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
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: extrem schwierig ../projects/double-stars/uwe-pilz/sketches/191129gammaCet.jpg
STF311, pi Ari, 42 Ari AB 5m3 8m0 3.3'' 118° 2015 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
STF314 AB-C 7m0 7m3 1.6'' 316° 2018 Per 02h52m52.03s +52°59'50.60"

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

Robert Zebahl
Leipzig (Germany)
152mm (129x) 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) ähnlich hell ../projects/double-stars/frederik-wanink/sketches/STF314.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) a nice half delta mag pair ~2"
Mark McCarthy
Fremont (California/USA)
317mm (553x) near equal brightness, AB more yellow yellow-white of the two, ~2 disk separation
HU544 6m7 8m2 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 7m4 7m8 44.1'' 234° 2017 Tau 03h31m03.47s +27°43'53.60"
Mark McCarthy
Fremont (California/USA)
80mm (13x) Nice finder split, equal mag but faint, ~8th mag.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Pretty finder split.
Uwe Pilz
Leipzig (Germany)
105mm (288x) 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 6m6 6m9 11.5'' 270° 2018 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.
Uwe Pilz
Leipzig (Germany)
105mm (288x) 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.
Mark McCarthy
Fremont (California/USA)
317mm (270x) equal mag, white, well separated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal white ~7", nice, W-E. Forms a double-double in wider FOV with STF 375.
★★ BU535, omicron Per, 38 Per, Atik 3m9 6m7 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
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 4m8 5m9 6.9'' 349° 2018 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 (288x) Farbkontrast, gelborange-blauweiß ../projects/double-stars/uwe-pilz/sketches/32Eri.jpg
omicron 2 Eri, 40 Eri, STF518 A-BC 4m4 9m3 83.7'' 102° 2016 Eri 04h15m16.32s -07°39'10.30"
BC 9m5 11m2 8.3'' 331° 2017

../images/binary-star-orbits/STF518-BC-orbit.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
STF546 7m9 9m2 6.8'' 181° 2015 Tau 04h27m00.62s +19°07'03.60"
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/200115stf546.jpg
STF545 AB 6m9 8m8 18.5'' 58° 2016 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) Wide, white, 1.5 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Blush white, ~2 delta mag, PA to NE, wide separation.
★★ STF559 7m0 7m0 3.0'' 277° 2018 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 4m3 7m8 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 AB 4m2 7m0 62.5'' 214° 2017 Tau 04h42m14.70s +22°57'25.10"
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
★★ STF616, omega Aur, 4 Aur AB 5m0 8m2 4.7'' 2015 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)
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 7m0 8m7 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 6m0 9m5 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
STF645 A-BC 6m0 9m1 11.3'' 29° 2017 Tau 05h09m45.06s +28°01'50.20"
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/200215_Struve645.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) White and grey, 2 delta mag, wide. BC is BU 1047 0.3" near equal, but not seen
★★ STF644 AB 7m0 6m8 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 8m1 8m9 4.7'' 62° 2019 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.
STF668, 19 Ori, beta Ori, Rigel A-BC 0m3 6m8 9.7'' 202° 2017 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
★★ STF653, 14 Aur AB 5m0 10m9 9.8'' 11° 2014 Aur 05h15m24.39s +32°41'15.30"
AC 5m0 7m3 14.2'' 225° 2017
AD 5m0 10m8 179.7'' 322° 2010
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 6m6 9m2 23.3'' 183° 2017 Aur 05h20m39.16s +46°57'49.60"
Uwe Pilz
Leipzig (Germany)
105mm (88x) orange ../projects/double-stars/uwe-pilz/sketches/191216stf681.jpg
STF698 AB 6m7 8m3 31.3'' 348° 2018 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 7m9 8m6 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 blueish
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 7m5 8m8 1.4'' 336° 2016 Aur 05h30m06.14s +29°32'55.30"
AC 7m5 9m4 15.2'' 353° 2016
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-blueish.
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 4m4 5m8 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 2m4 14m2 33.4'' 229° 2016 Ori 05h32m00.40s -00°17'56.70"
STFA14 AC 2m4 6m8 56.2'' 2017
Rene Merting
Drachhausen (Germany)
10x50 AC: Komponente C zeigt sich gut abgesetzt im NW von A - Helligkeitsunterschied enorm, mindestens 3 Größenklassen
Rene 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
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.
26 Aur, STF753 AB-C 5m5 8m4 12.0'' 269° 2013 Aur 05h38m38.10s +30°29'32.80"
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.
Uwe Pilz
Leipzig (Germany)
105mm (88x) heller Stern blauweiß ../projects/double-stars/uwe-pilz/sketches/200215_26Aur.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright yellow A and a fainter yellow white B.
★★★ sigma Ori, 48 Ori, STF762, STF3135, BU1032 BU1032 AB 4m1 5m3 0.3'' 77° 2015 Ori 05h38m44.77s -02°36'00.20"
STF762 AB-C 3m8 8m8 11.6'' 237° 2016
STF762 AB-D 3m8 6m6 12.9'' 84° 2018
STF762 AB-E 3m8 6m3 41.5'' 62° 2018
STF762 DC 6m6 8m8 23.7'' 253° 2018
STF762 EC 6m3 8m8 52.9'' 241° 2018
STF762 ED 6m3 6m6 29.9'' 233° 2018
STF3135 AB-F 3m8 7m9 208.0'' 324° 2016
Rene 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 STF791 ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
STF774, zeta Ori, 50 Ori, Alnitak AB 1m9 3m7 2.4'' 167° 2017 Ori 05h40m45.52s -01°56'33.30"

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

Robert Zebahl
Leipzig (Germany)
70mm (128x) Big difference in brightness. I could see the fainter component near the first ring of the Airy pattern of the brighter component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) sauber getrennt, Beugungsscheiben berühren sich gerade ../projects/double-stars/uwe-pilz/sketches/Alnitak.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Alnitak. Easy, 2 delta mag,~2", white
Mark McCarthy
Fremont (California/USA)
317mm (207x) about 2" and 1.5 delta mag.
★★★ STF764 6m4 7m1 25.6'' 14° 2017 Aur 05h41m20.98s +29°29'14.70"
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. A nice double star for binoculars.
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
Mark McCarthy
Fremont (California/USA)
317mm (277x) two bright whites widely separated
STF783 8m1 9m7 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 6m5 7m5 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 9m1 10m0 5.0'' 91° 2019 Aur 05h50m03.41s +39°34'34.70"
AC 9m1 11m2 60.7'' 214° 2015
Uwe Pilz
Leipzig (Germany)
320mm (80x) A und B sind deutlich orange. Im selben Feld wie Sigma Orionis ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
STF805 8m4 8m9 12.1'' 50° 2015 Tau 05h51m48.20s +28°26'59.60"
Rene 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 2m6 7m2 4.1'' 303° 2018 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
BU16, 3 Mon 5m0 8m0 1.9'' 355° 1996 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 6m9 9m3 3.6'' 192° 2019 Mon 06h08m25.39s -11°08'46.60"
AC 6m9 10m8 10.2'' 260° 2015
BC 9m3 10m8 9.3'' 276° 1998
Uwe Pilz
Leipzig (Germany)
105mm (288x) Dreifachstern! (Burnham 17) ../projects/double-stars/uwe-pilz/sketches/bu17.jpg
BU1008, eta Gem, 7 Gem, Propus 3m5 6m2 1.8'' 258° 2017 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 4m4 6m6 12.0'' 29° 2017 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
★★★ beta Mon, 11 Mon, STF919, BU570 STF919 AB 4m6 5m0 7.1'' 133° 2017 Mon 06h28m49.07s -07°01'59.00"
STF919 AC 4m6 5m4 9.8'' 125° 2018
STF919 BC 5m0 5m3 2.6'' 108° 2018
BU570 AD 4m6 12m1 26.5'' 56° 2014
Rene Merting
Drachhausen (Germany)
18x70 STF919 (AB): 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
Rene 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
★★ STT147 AB 6m8 8m7 42.7'' 74° 2016 Aur 06h34m19.37s +38°04'33.60"
A-CD 6m8 9m8 44.5'' 119° 2016
CD 10m6 11m0 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-blueish; 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 7m9 8m6 3.4'' 131° 2019 Aur 06h34m41.81s +38°32'24.50"
AC 7m9 12m4 130.9'' 124° 2002
BC 8m6 12m4 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, decent orange. At 125x A appeared orange, B grey-blueish.
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!
STT152, 54 Aur 6m2 7m8 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 7m3 9m1 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!
★★★ STF948, 12 Lyn AB 5m4 6m0 1.9'' 64° 2019 Lyn 06h46m14.15s +59°26'30.10"
AC 5m4 7m0 8.8'' 310° 2018

../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.
STT159, 15 Lyn AB 4m5 5m5 0.7'' 236° 2017 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 7m2 7m4 124.1'' 53° 2015 Gem 06h58m06.59s +14°13'43.40"
AC 7m2 8m4 81.2'' 112° 2015
Robert Zebahl
Leipzig (Germany)
70mm (22x) All 3 components form a striking triangle and are slightly different in color. A (western component): white-blueish; 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 7m4 11m4 14.6'' 300° 2015 Gem 07h00m37.12s +12°43'24.20"
AC 7m4 10m0 21.9'' 244° 2015
AD 7m4 7m7 67.7'' 28° 2016
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 7m2 7m8 0.8'' 311° 2018 Mon 07h01m49.89s -10°52'56.30"

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

Uwe Pilz
Leipzig (Germany)
105mm (247x) schwach gekerbt ../projects/double-stars/uwe-pilz/sketches/bu573.jpg
HJ3288 7m3 8m7 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 7m8 9m4 9.1'' 66° 2019 Lyn 07h03m05.51s +54°10'26.60"
AC 7m8 9m3 9.9'' 58° 2019
BC 9m4 9m3 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 decent 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
STF1037 AB 7m2 7m3 0.8'' 304° 2018 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
Frederik Wanink
Itterbeck (Germany)
254mm (640x) leichter, gleich hell ../projects/double-stars/frederik-wanink/sketches/STF1037.jpg
STF1033 AB 7m8 8m4 1.5'' 278° 2017 Lyn 07h14m48.05s +52°32'44.10"
AC 7m8 10m2 79.6'' 273° 2015
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
★★ HJ3945 AB 5m0 5m8 26.8'' 50° 2015 CMa 07h16m36.84s -23°18'56.10"
Rene Merting
Drachhausen (Germany)
8x30 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
Rene Merting
Drachhausen (Germany)
10x50 ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
Rene Merting
Drachhausen (Germany)
18x70 ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
Rene Merting
Drachhausen (Germany)
100mm (20x) 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) soforrt auffallend, blau-orange ../projects/double-stars/uwe-pilz/sketches/hj3945.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.
STF1050 AB 8m1 8m8 19.3'' 21° 2017 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
STF1062, 19 Lyn AB 5m8 6m7 14.8'' 316° 2018 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. Colorwise unremarkable.
★★★ STF1110, alpha Gem, 66 Gem, Castor AB 1m9 3m0 5.4'' 53° 2019 Gem 07h34m35.86s +31°53'17.80"
AC 1m9 9m8 69.8'' 163° 2017
AD 1m9 10m1 179.8'' 221° 2017

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

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)
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.
Rene 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
STF1171 6m5 9m9 2.0'' 326° 2015 Cnc 08h01m00.78s +23°34'59.20"
Rene 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)
317mm (553x) Yellow and orange, 4 delta mag! very faint and close B
STF1177, 17 Cnc 6m7 7m4 3.6'' 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.
Rene 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
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.
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"
★★★ STF1196, zeta Cnc, 16 Cnc AC 5m3 5m8 6.3'' 51° 2019 Cnc 08h12m12.79s +17°38'51.20"
AB-C 4m9 5m8 6.0'' 64° 2018
AB 5m3 6m2 1.1'' 2018

../images/binary-star-orbits/STF1196-AB-C-orbit.jpg ../images/binary-star-orbits/STF1196-AB-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
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
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
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) AB: 2+1 system, the +1 star is HUT 1. STF 1196AB make a nice tight pair. They are all nearly the same magnitude, white & brilliant
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.
STF1223, phi 2 Cnc 6m2 6m2 5.4'' 218° 2019 Cnc 08h26m47.08s +26°56'07.80"
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schön, blauweiß-gelbweiß ../projects/double-stars/uwe-pilz/sketches/stf1223.jpg
STF1230 9m3 10m6 34.2'' 186° 2015 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
★★ STF1245 AB 6m0 7m2 10.1'' 25° 2018 Hya 08h35m51.05s +06°37'13.90"
AC 6m0 10m7 100.4'' 109° 2017
AD 6m0 11m9 110.3'' 292° 2017
AE 6m0 9m6 114.8'' 207° 2017
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
Rene 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
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
★★ STF1268, iota Cnc, 48 Cnc 4m1 6m0 30.7'' 308° 2018 Cnc 08h46m41.82s +28°45'35.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-blueish.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Grand sight! Pretty wide apart and unequal. A: decent 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 (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) 80mm finder split, beautiful yellow and blue. Scope view real nice. Very good diffraction and airy disks.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Iot Cnc: Pretty orange and pale blue, showpiece object.
★★★ STF1273, 11 Hya, epsilon Hya AB-C 3m5 6m7 2.9'' 309° 2017 Hya 08h46m46.51s +06°25'07.70"

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Uwe Pilz
Leipzig (Germany)
105mm (200x) bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) 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]
BU335 7m5 9m4 2.6'' 265° 2017 Hya 08h48m12.24s +02°34'48.40"
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig ../projects/double-stars/uwe-pilz/sketches/200323BU335.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Close, ~3", 2 delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (533x) 3 delta mag, well split ~3", very pleasing pair, white A and slightly red B
STF1291, 57 Cnc AB 6m1 6m4 1.6'' 309° 2019 Cnc 08h54m14.65s +30°34'45.80"
AB-C 5m5 9m2 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 4m9 8m8 4.3'' 348° 2016 UMa 09h10m23.53s +67°08'03.30"
AC 4m9 10m3 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.
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: sehr schwierig bei 88x ../projects/double-stars/uwe-pilz/sketches/200316stf1306.jpg
STF1336 7m0 11m1 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 6m6 6m7 1.9'' 50° 2017 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.
Uwe Pilz
Leipzig (Germany)
105mm (200x) fast gleich hell, beide gelblich, bei 66x schwierig ../projects/double-stars/uwe-pilz/sketches/stf1333.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Brilliant white pair, near equal, ~2" separation
STF1334, 38 Lyn AB 3m9 6m1 2.5'' 229° 2017 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
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb, trennbar bei 66x ../projects/double-stars/uwe-pilz/sketches/38Lyn.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 38 Lyn: Very bright A with 3x fainter dull white B, 3-4"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 38 Lyn. A is a bright light yellow and B is a ~2 delta mag orange-yellow, well split and bright
★★ STF1347 7m3 8m3 21.1'' 312° 2016 Hya 09h23m15.76s +03°30'05.00"
Rene 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 7m5 7m6 2.0'' 314° 2018 Hya 09h24m28.48s +06°21'01.80"
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 7m7 7m8 1.8'' 357° 2018 Hya 09h27m16.69s +06°13'59.00"

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

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 7m5 9m0 19.2'' 166° 2015 UMa 09h31m09.89s +67°32'28.40"
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.
Rene 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
Rene 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 8m3 8m3 10.2'' 249° 2015 UMa 09h34m19.56s +66°47'42.30"
AC 8m3 9m2 131.0'' 216° 2015
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.
Rene 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-blueish. 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
Rene Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß
★★ STF1424, gamma Leo, 41 Leo, Algieba AB 2m4 3m6 4.9'' 126° 2019 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

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.
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.
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"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright yellow and yellow-white, 1 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very bright yellow, 1 delta mag wide.
Rene 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
STF1466, 35 Sex AB 6m2 7m1 6.9'' 241° 2018 Sex 10h43m20.91s +04°44'51.60"
Rene 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.]
STF1517 AB 7m5 8m0 0.7'' 314° 2017 Leo 11h13m40.99s +20°07'43.30"

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

Uwe Pilz
Leipzig (Germany)
105mm (200x) länglich ../projects/double-stars/uwe-pilz/sketches/200327stf1517.jpg
Mark McCarthy
Fremont (California/USA)
317mm (340x) Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (533x) Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal
★★ STF1523, xi UMa, 53 UMa, Alula Australis AB 4m3 4m8 2.1'' 155° 2019 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.
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
★★ STF1540, 83 Leo AB 6m5 7m5 28.4'' 150° 2018 Leo 11h26m45.32s +03°00'47.20"
Stefan Loibl
Rosenheim (Germany)
10x50 clearly split, little difference in magnitude
Rene 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)
317mm (340x) Yellow A and reddish B wide separation.
Rene 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 5m0 7m5 89.2'' 181° 2019 Leo 11h27m56.23s +02°51'22.50"
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
★★ STF1552, 90 Leo AC 6m3 9m8 63.4'' 235° 2018 Leo 11h34m42.50s +16°47'48.90"
AB 6m3 7m3 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
Rene 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
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 AB 6m4 6m8 0.8'' 149° 2016 Leo 11h36m17.94s +27°46'52.70"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) blickweise gerade eben trennbar ../projects/double-stars/frederik-wanink/sketches/STF1555.jpg
Mark McCarthy
Fremont (California/USA)
317mm (443x) Nice! AB tight hair-split white pair, with fainter & wide separated AB-C in a row to the east.
Mark McCarthy
Fremont (California/USA)
508mm (553x) Hairline split at 333x, clear split with 533x, very close ~0.5", bright. Part of plus one
STF1579, 65 UMa AB-C 6m7 8m3 3.8'' 40° 2017 UMa 11h55m05.74s +46°28'36.60"
AB-D 6m7 7m0 62.5'' 114° 2018
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) AB-C: Easy to split, but the faint C component only appeared as a tiny star. ../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
★★★ STF1670, gamma Vir, 29 Vir, Porrima AB 3m5 3m5 2.7'' 2018 Vir 12h41m39.60s -01°26'57.90"

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

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 (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.
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
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)
317mm (170x) Porrima. Very pretty yellow-white, near equal, close split at 170x. Star disks improved with apodizing mask.
★★ STF1692, 12 CVn, alpha CVn, Cor Caroli AB 2m9 5m5 19.5'' 230° 2018 CVn 12h56m01.67s +38°19'06.20"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, secondary component silvery-white.
Rene 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.
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.
Rene 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
STF1740 7m1 7m4 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
Rene 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.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Easy wide white A and hint or orange B.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201740.png
★★ zeta UMa STF1744, 79 UMa, Mizar AB 2m2 3m9 14.4'' 153° 2017 UMa 13h23m55.42s +54°55'31.50"
STF1744, Mizar & Alcor AC 2m2 4m0 707.7'' 72° 2017
SMR4 AD 2m2 7m6 492.8'' 102° 2017
Rene 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) - Komponente D (SMR4) ist östlich der beiden Sterne ganz schwach erkennbar, D steht dabei näher zu C
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.
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)
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
Joerg 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
STF1757 AB 7m8 8m8 1.7'' 143° 2018 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 5m0 7m0 1.7'' 99° 2018 CVn 13h37m27.70s +36°17'41.40"
STF1768 AC 5m0 11m6 214.3'' 321° 2015
KZA73 AD 5m0 13m0 335.6'' 92° 2015
KZA73 AE 5m0 12m7 369.5'' 139° 2015
KZA73 AF 5m0 9m4 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!
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: 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 5m5 8m3 2.7'' 227° 2015 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.
STF1816 7m4 7m8 0.4'' 99° 2016 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)
317mm (553x) Rod-shaped equal white. July 2017
★★ STF1830, STF1831 STF1831 AB 7m2 9m6 5.8'' 138° 2017 UMa 14h16m08.47s +56°42'45.70"
STF1831 AC 7m2 6m7 112.2'' 219° 2017
STF1831 CD 6m7 13m1 112.1'' 116° 2016
STF1830 CE 6m7 9m3 138.0'' 245° 2016
STF1830 EF 9m3 10m3 10.6'' 312° 2017
STF1830 EG 9m3 12m2 35.2'' 81° 2017
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.
Rene 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
Rene 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
STT281 7m7 9m7 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!
STF1863 7m7 7m8 0.6'' 63° 2018 Boo 14h38m00.71s +51°34'42.10"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) gerade trennbar ../projects/double-stars/frederik-wanink/sketches/STF1863.jpg
★★ zeta Boo STF1865 AB 4m5 4m5 0.3'' 283° 2018 Boo 14h41m08.92s +13°43'42.00"
H6 104 AB-C 4m5 11m0 104.3'' 260° 2015

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

Uwe Pilz
Leipzig (Germany)
105mm (88x) AB-C ../projects/double-stars/uwe-pilz/sketches/zetaBoo.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 6m3 9m2 4.2'' 314° 2015 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 2m6 4m8 2.8'' 347° 2018 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.
Rene 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)
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
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
Berthold Fuchs
Wiesbaden (Germany)
130mm magnificent DS ../projects/double-stars/berthold-fuchs/photographs/eps%20Bootis.png
STF1881 6m7 8m8 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 6m6 7m5 2.1'' 58° 2019 Boo 14h48m23.37s +24°22'01.00"

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

Rene 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) White, fairly close ~3", half delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (333x) White, fairly close ~3", half delta mag.
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
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-white, 3 delta mag, ~5"
BU106, mu Lib AB 5m6 6m6 2.0'' 2016 Lib 14h49m19.09s -14°08'56.30"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) Close, 1.5-2", half to one delta mag, off-white stars
Mark McCarthy
Fremont (California/USA)
203mm (333x) Close, 1.5-2", half to one delta mag, off-white stars.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt, schwierig wegen Südlage ../projects/double-stars/frederik-wanink/sketches/MuLib.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Mu Lib: Easy, white & off white, 1 delta mag, ~3"
STF1890, 39 Boo 6m3 6m7 2.5'' 46° 2019 Boo 14h49m41.37s +48°43'15.60"

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

Robert Zebahl
Leipzig (Germany)
70mm (67x) 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.
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
STF1888, xi Boo AB 4m8 7m0 5.3'' 300° 2018 Boo 14h51m23.38s +19°06'01.70"

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

Sarah Gebauer
Germany
150mm (83x) 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)
203mm (205x) A star a very pretty light yellow with 2 delta mag. light orange B star, ~5" separation
Mark McCarthy
Fremont (California/USA)
203mm (205x) A star a very pretty light yellow with 2 delta mag. light orange B, ~5".
Mark McCarthy
Fremont (California/USA)
317mm (277x) Xi Boo Pretty yellow & orange pair, 2 delta mag, ~8".
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty. Yellow and orange pair, ~6", 3 delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Xi Boo. Short period. Richly colored yellow and orange stars, ~1 delta mag, ~5" separation, with several other stars in view. Very pretty
STT288 6m9 7m5 1.0'' 157° 2018 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 5m2 6m1 0.4'' 91° 2018 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 7m3 7m4 1.4'' 268° 2019 CrB 15h18m20.19s +26°50'24.70"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal, yellowish white, ~2"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal, yellowish white, ~2"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very beautiful near equal white stars, ~1.5"
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 5m5 8m8 3.4'' 22° 2008 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)
203mm (333x) Light yellow A and very much fainter B, wide separation.
STF1937, eta CrB AB 5m6 6m0 0.4'' 258° 2019 CrB 15h23m12.23s +30°17'17.70"
Mark McCarthy
Fremont (California/USA)
203mm (667x) 8" @ 333x, Suspect elongation. 8" 667x definite egg shape. 20" 667x: Can't get a good focus
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 STFA28, mu 1 Boo, 51 Boo AB 4m3 7m1 109.0'' 172° 2018 Boo 15h24m29.54s +37°22'37.10"
STF1938, mu 2 Boo Ba-Bb 7m1 7m6 2.3'' 2019

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

Robert Zebahl
Leipzig (Germany)
8x40 STFA28 (AB): Easily split with obvious difference in brightness.
Rene 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.
Robert Zebahl
Leipzig (Germany)
102mm (125x) STF1938 (Ba-Bb): 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
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) 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) STF1938 (Ba-Bb): Tight 3 detla mag pair, fainter than the bright white A star Mu Boo.
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
HU149 7m5 7m6 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
STF1954, delta Ser, 13 Ser AB 4m2 5m2 4.0'' 171° 2019 Ser 15h34m48.14s +10°32'20.00"
AC 4m2 13m9 66.6'' 18° 2014
CD 13m9 14m6 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.
Rene 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) 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
STF1989, pi UMi 7m3 8m2 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
★★ STF1973 7m6 8m8 30.8'' 320° 2015 CrB 15h46m24.50s +36°26'45.60"
Rene 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.
★★ STF2054 AB 6m2 7m1 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 2m8 8m2 4.4'' 143° 2015 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 4m2 5m2 1.6'' 45° 2018 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
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/Marfic.jpg
STT313 8m0 8m3 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 5m4 5m5 90.0'' 193° 2017 Dra 16h36m13.72s +52°55'27.80"
STF2078, 17 Dra AB 5m4 6m4 3.3'' 104° 2018
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) STF2078 (AB): 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.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF2078 (AB): sehr schönes Dreiersystem ../projects/double-stars/frederik-wanink/sketches/17Dra.jpg
STF2084, zeta Her, 40 Her 3m0 5m4 1.6'' 115° 2018 Her 16h41m17.16s +31°36'09.80"

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

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
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
STF2098 AB 8m8 9m6 14.3'' 145° 2015 Her 16h45m43.47s +30°00'17.20"
AC 8m8 8m8 65.9'' 128° 2015
AD 8m8 11m0 67.6'' 18° 2015
DE 11m0 13m7 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 6m1 9m7 23.9'' 88° 2019 Oph 16h47m09.76s +02°03'52.40"
AC 6m1 11m4 214.1'' 193° 2015
Rene 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 9m5 9m6 0.3'' 266° 2012 Her 16h49m14.20s +45°59'00.40"
BU627 A-BC 4m8 8m4 2.2'' 44° 2018

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

Rene 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
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 7m1 7m3 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 7m0 9m6 2.9'' 243° 2015 Her 16h56m39.66s +14°08'24.90"
Rene 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
Joerg 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 9m7 10m3 2.1'' 263° 2018 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)
317mm (553x) Faint pair, 1 delta mag, ~2"
H4 122, V451 Her 6m3 10m3 18.9'' 238° 2015 Her 17h01m33.05s +14°56'59.00"
Joerg 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 5m7 5m7 2.5'' 2018 Dra 17h05m20.20s +54°28'14.30"
BU1088 AC 5m7 13m7 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
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.
Frederik Wanink
Itterbeck (Germany)
254mm (460x) AB: gleich hell ../projects/double-stars/frederik-wanink/sketches/STF2130.jpg
★★ STF2140, alpha Her, 64 Her, Ras Algethi AB 3m5 5m4 4.8'' 105° 2018 Her 17h14m38.86s +14°23'24.90"

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

Robert Zebahl
Leipzig (Germany)
55mm (41x) Well split with noticeable difference in brightness.
Rene 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.
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.
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!
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright orange and blue-green-grey B.
Jens Leich
Germany
130mm ../projects/double-stars/jens-leich/photographs/Doppelstern_Rasalgethi_Herkules_220719_2159UT_RGB.jpg
STF3127, delta Her, 65 Her AB 3m1 8m3 13.5'' 292° 2018 Her 17h15m01.92s +24°50'22.50"
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 (277x) Delta Her: Nice wide pair, good image quality, yellow and lighter yellow
Mark McCarthy
Fremont (California/USA)
317mm (553x) Sarin. Very bright and much fainter B, looks like a planet
omicron Oph, 39 Oph, H3 25 5m2 6m6 10.0'' 354° 2015 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
STF2166 7m2 8m6 27.2'' 282° 2015 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)
203mm (333x) White and slight off-white wide separation B.
STFA34, 53 Oph AB 5m8 7m5 41.6'' 191° 2018 Oph 17h34m36.69s +09°35'12.20"
Rene Merting
Drachhausen (Germany)
16x70 gut getrenntes Pärchen, bei dem Komponente B im Süden deutlich schwächer und grau gegenüber A wirkt
Rene Merting
Drachhausen (Germany)
100mm (20x) 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) weiß und blaugrau. Trennbar bei 22x ../projects/double-stars/uwe-pilz/sketches/191025_53Oph.jpg
STF2203 7m7 7m8 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
★★ STF2308 40/41 Dra AB 5m7 6m0 18.7'' 232° 2018 Dra 18h00m09.07s +80°00'13.70"
AC 5m7 8m3 224.7'' 129° 2015

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

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.
Rene 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.
STF2264, 95 Her 4m8 5m2 6.4'' 257° 2018 Her 18h01m30.41s +21°35'44.80"
Rene 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
Uwe Pilz
Leipzig (Germany)
105mm (288x) ../projects/double-stars/uwe-pilz/sketches/95Her.jpg
Mark McCarthy
Fremont (California/USA)
508mm (667x) 95 Her. Orange and blue, wide, bright.
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/95%20Herculis.png
STF2262, tau Oph AB 5m3 5m9 1.5'' 289° 2018 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 4m2 6m2 6.8'' 121° 2018 Oph 18h05m27.37s +02°29'59.30"

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

Rene 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
Joerg S. Schlimmer
Germany
127mm (136x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%2070%20Oph_filtered_96dpi.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
STF2281, 73 Oph AB 6m0 7m5 0.8'' 283° 2018 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 7m7 8m6 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 6m7 7m2 1.2'' 219° 2018 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 7m0 8m7 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.
STF2323, 39 Dra AC 5m1 8m0 89.1'' 19° 2017 Dra 18h23m54.65s +58°48'02.10"
AB 5m1 8m1 3.8'' 348° 2018

../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
STF2315 AB 6m6 7m8 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)
317mm (553x) Near contact / overlapping disks, 0.5 delta mag. September 2017
HU66 BC 8m4 8m2 0.8'' 27° 2018 Dra 18h25m18.20s +48°45'42.50"

../images/binary-star-orbits/HU66-BC-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/HU66.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine near equal pair, yellowish A and blue-white B. ~1" or less.
STF2320 7m1 8m9 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.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Close in pair to A in the 20" but it disappeared in 8", 1 delta mag.
★★ STT359 6m3 6m6 0.9'' 2018 Her 18h35m30.40s +23°36'19.90"

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

Uwe Pilz
Leipzig (Germany)
105mm (198x) leicht eingekerbt, Abstand 0“75 ../projects/double-stars/uwe-pilz/sketches/stt359.jpg
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.
STF2349 AB 5m4 9m4 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)
317mm (277x) Bright white and faint ruddy B, fairly close ~4".
★★ alpha Lyr, 3 Lyr, Vega H5 39 AB 0m1 9m5 83.7'' 184° 2017 Lyr 18h36m56.33s +38°47'01.20"
STFB9 AC 0m1 11m0 76.0'' 255° 2012
STFB9 AE 0m1 9m5 86.6'' 39° 2017
Joerg 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
Joerg 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 7m5 8m1 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
STF2372 AB 6m5 7m7 25.0'' 82° 2019 Lyr 18h42m08.09s +34°44'46.70"
Rene 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 4m7 4m6 209.5'' 172° 2016 Lyr 18h44m20.34s +39°40'12.40"
STFA37 AI 5m2 10m1 149.5'' 137° 2015
STF2382, 4 Lyr, epsilon 1 Lyr AB 5m2 6m1 2.2'' 346° 2018
STF2383, 5 Lyr, epsilon 2 Lyr CD 5m2 5m4 2.4'' 75° 2018

../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)
2x54 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.
Rene Merting
Drachhausen (Germany)
100mm (107x) STF2382 (AB): bei 64x ist das Sternpaar mit leichter Einschnürung und Nord-Süd-Ausdehnung erkennbar - beide Sterne stehen minimal enger zusammen als das südlichere Paar STF2383 - bei 107x knappe Trennung, Komponente B nördlich ist mindestens eine halbe Größenklasse schwächer als A
Rene Merting
Drachhausen (Germany)
100mm (107x) STF2383 (CD): bei 64x als 8 mit Ost-West-Ausdehnung erkennbar - bei 107x knapp getrennt, beide Komponenten sind etwa gleich hell
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
Joerg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Epsilon-Lyrae_ausschnitt_filtered.jpg
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 4m3 5m6 43.7'' 150° 2018 Lyr 18h44m46.36s +37°36'18.40"
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.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Zeta 2 Lyr. Slightly greenish-white stars. Best view in finder, cleaner. Wide, 1 delta mag.
Rene Merting
Drachhausen (Germany)
100mm (20x) bei 20x weit getrennt, Komponente A weißlich, D leicht gelblich
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß-orange ../projects/double-stars/uwe-pilz/sketches/zetaLyr.jpg
STF2390 7m4 8m6 4.3'' 155° 2016 Lyr 18h45m49.83s +34°31'06.60"
Rene 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.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Light yellow and pale blue, wide, 2 delta mag.
★★ beta Lyr, 10 Lyr STFA39 AB 3m6 6m7 45.7'' 149° 2017 Lyr 18h50m04.79s +33°21'45.60"
BU293 AE 3m6 10m1 67.2'' 317° 2015
BU293 AF 3m6 10m6 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.
Rene Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x sind die Komponenten A und B weit getrennt, B ist deutlich schwächer - zwei gleichhelle Fühlersterne (E und F) nördlich von Komponente A machen das System interessanter - sie sind noch schwächer als B - Farbe konnte ich bei keinem der vier Sterne erkennen
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
Joerg S. Schlimmer
Germany
127mm (108x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-beta-Lyrae_filtered_96dpi.jpg
STF2404 6m9 7m8 3.7'' 181° 2019 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 blueish tint.
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) Both orange, very well split, around 7”
Mark McCarthy
Fremont (California/USA)
317mm (553x) well split, yellow A and yellow-orange B.
delta Lyr, 11/12 Lyr, delta Lyrae Cluster, Stephenson 1 H6 3, delta 1 Lyr 5m5 9m9 175.3'' 20° 2012 Lyr 18h53m43.56s +36°58'18.20"
ES2028, delta 2 Lyr AB 4m3 11m2 86.3'' 349° 2014
ES2028, delta 2 Lyr BC 11m2 11m6 2.1'' 135° 2008
SMR13, delta 2 Lyr AD 4m5 8m8 193.1'' 210° 2014
SMR13, delta 2 Lyr AE 4m5 10m3 400.6'' 238° 2014
SMR13, delta 2 Lyr AF 4m5 8m8 369.4'' 245° 2014
SMR13, delta 2 Lyr AG 4m5 9m8 335.9'' 261° 2014
SMR13, delta 2 Lyr AH 4m5 8m7 229.4'' 284° 2014
SMR13, delta 2 Lyr AJ 4m3 12m0 279.5'' 249° 2014
SMR13, delta 2 Lyr AK 4m3 12m0 304.2'' 236° 2014
SMR13, delta 2 Lyr HI 8m7 12m9 26.1'' 251° 2015
Joerg S. Schlimmer
Germany
305mm (94x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-delta-Lyrae_filtered_96dpi.jpg
BU137 AB 8m7 9m0 1.5'' 169° 2015 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")
STT525 AB 6m1 9m1 1.8'' 130° 2015 Lyr 18h54m52.52s +33°58'06.90"
Uwe Pilz
Leipzig (Germany)
105mm (21x) Orange und türkis ../projects/double-stars/uwe-pilz/sketches/191031STT525.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) gelbweiß-blau
Frederik Wanink
Itterbeck (Germany)
254mm (640x) 3er System, sehr schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/STT525.jpg
STF2421 8m1 9m3 24.6'' 57° 2015 Lyr 18h56m01.68s +33°47'08.10"
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
★★ STF2422 7m9 8m2 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 7m0 7m4 0.9'' 358° 2018 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
STT369 7m8 7m9 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
★★ STF2474 AB 6m8 7m9 15.9'' 264° 2018 Lyr 19h09m04.35s +34°35'59.90"
Rene 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
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, V338 Sge AB 7m1 8m0 0.6'' 136° 2017 Sge 19h12m34.45s +16°50'47.20"

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

Mark McCarthy
Fremont (California/USA)
203mm (667x) At the very best moments of seeing, which were fleeting, saw kissing disks to hairline split. Suspected elongation at 205x & 333x.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt, schwierig, 0,6"? ../projects/double-stars/frederik-wanink/sketches/BU139.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) V338 Sge. Overlapping airy disks.
STT371 AB 7m0 7m5 0.9'' 161° 2018 Lyr 19h15m56.96s +27°27'21.40"
AB-C 7m0 9m8 47.4'' 271° 2007
Rene Merting
Drachhausen (Germany)
100mm (20x) AB-C: bei 20x ist Komponente C im Westen schwach erkennbar in einem ordentlichen Abstand zu Komponente AB
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/STT371.jpg
★★★ beta Cyg, 6 Cyg, Albireo, STFA43 AB 3m2 4m7 34.6'' 54° 2019 Cyg 19h30m43.29s +27°57'34.90"
Robert Zebahl
Leipzig (Germany)
8x40 Well split, but I didn't recognised any color.
Rene 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
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!
Rene 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
Joerg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_127mm.jpg
Joerg S. Schlimmer
Germany
305mm (170x) alle Komponenten einfach zu trennen ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_305mm.jpg
KUI94 6m5 7m8 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
STT383 AB 7m0 8m3 0.8'' 15° 2014 Cyg 19h42m56.26s +40°43'18.30"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STT383.jpg
STT384 AB 7m6 8m2 1.0'' 196° 2018 Cyg 19h43m47.09s +38°19'20.50"
AC 7m6 9m8 59.4'' 297° 2015
AD 7m6 10m8 116.0'' 294° 2015
Rene 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.)
STF2579, delta Cyg, 18 Cyg AB 2m9 6m3 2.8'' 218° 2016 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!
STT386 8m5 8m6 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 6m3 6m8 1.4'' 106° 2018 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.
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
Mark McCarthy
Fremont (California/USA)
317mm (553x) 52, Pi Aql. Very definite split. A mini Alberio, gold and blue.
STT387 7m1 7m9 0.4'' 105° 2018 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.
DJU4, 13 Vul 4m6 7m4 1.4'' 246° 2016 Vul 19h53m27.69s +24°04'46.60"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/13Vul.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 13 Vul: Very bright white A and 3- delta mag B, ~1.5-2", west PA
STF2605, psi Cyg, 24 Cyg AB 5m0 7m5 2.8'' 177° 2014 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.
Rene 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
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and ruddy, fairly wide, ~4" 2 delta mag.
★★ STF2606 AB 7m7 8m4 0.7'' 146° 2017 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 5m8 6m2 0.7'' 129° 2018 Vul 20h02m01.45s +24°56'16.80"

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

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
★★ SHJ314, V1676 Cyg AF 6m8 7m3 35.8'' 28° 2018 Cyg 20h05m57.32s +35°47'18.20"
AD 6m8 9m5 11.3'' 301° 2018
Rene 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 6m9 7m1 2.6'' 206° 2018 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
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice near equal pair, wide separation.
★★ STFA50, omicron Cyg, 30 Cyg, 31 Cyg AD 3m9 4m8 336.7'' 322° 2016 Cyg 20h13m37.90s +46°44'28.80"
AC 3m9 7m0 108.6'' 173° 2016
Robert Zebahl
Leipzig (Germany)
naked eye AD: Well split with noticeable difference in brightness.
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.
Rene 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.
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x sind alle drei Sterne weit getrennt und doch irgendwie zusammengehörend, Komponente A hellgelb, 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
STF2658 AB 7m2 9m4 5.4'' 106° 2015 Cyg 20h13m40.70s +53°07'00.00"

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

Rene 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
STT403 AB 7m3 7m6 1.0'' 171° 2016 Cyg 20h14m21.53s +42°06'15.60"
Uwe Pilz
Leipzig (Germany)
105mm (288x) schwierig
Robert Zebahl
Leipzig (Germany)
152mm (270x) 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) schwaches 3er System, getrennt ../projects/double-stars/frederik-wanink/sketches/STT403.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 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) Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)
★★ WEI35 AB 8m3 8m8 4.0'' 214° 2018 Cyg 20h29m13.54s +37°30'45.80"
AC 8m3 9m4 87.6'' 100° 2015
CD 9m4 10m6 12.1'' 202° 2018
Rene 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 8m1 8m4 17.0'' 31° 2017 Cyg 20h29m43.18s +38°07'31.50"
Rene 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 6m2 8m0 0.9'' 347° 2016 Del 20h30m17.95s +10°53'45.30"
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.
STT410 AB 6m7 6m8 0.9'' 2018 Cyg 20h39m33.31s +40°34'46.80"
AB-C 6m8 8m7 68.6'' 70° 2018
AB-D 6m8 10m0 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 (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
★★ STF2725 AB 7m5 8m2 6.1'' 12° 2018 Del 20h46m13.31s +15°54'26.40"

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

Rene 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
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
Mark McCarthy
Fremont (California/USA)
317mm (277x) Near equal yellow-white stars, wide separation.
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.
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/STF%202725.png
★★ STF2727, 12 Del, gamma Del AB 4m4 5m0 8.9'' 265° 2019 Del 20h46m39.50s +16°07'27.40"

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

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.
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.
Rene 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 STF2525 gut 15' südlich sehenswert
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
Mark McCarthy
Fremont (California/USA)
317mm (277x) Gamma Delphinus. Rich gold-yellow A, blue-white B, ~6" separation estimated by eye. Very pretty pair.
STT413, 54 Cyg, lambda Cyg AB 4m7 6m3 0.9'' 2018 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
Robert Zebahl
Leipzig (Germany)
152mm (300x) The fainter component was visible as a permanent brightening of the first diffraction ring.
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 5m6 8m2 1.5'' 199° 2009 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 7m4 8m1 0.7'' 41° 2018 Cyg 20h51m05.41s +51°25'01.70"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/BU155.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Clean split, nice disks, 1 delta mag, ~1". Pale yellow and pale easter egg blue.
STT417 AB 8m2 8m4 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
STT418 8m2 8m3 0.9'' 284° 2018 Cyg 20h54m49.84s +32°42'23.20"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt, gleich hell ../projects/double-stars/frederik-wanink/sketches/STT418.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal 1” split, white.
STF2735 6m5 7m5 2.0'' 282° 2015 Del 20h55m40.64s +04°31'57.70"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Hauptstern leicht gelblich ../projects/double-stars/frederik-wanink/sketches/STF2735.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue, Alberio-like, 2 delta mag, well split
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty gold and blue, close but well separated.
STF2746 7m9 8m7 1.2'' 323° 2018 Cyg 21h01m50.05s +39°15'38.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, schwach, Helligkeitsunterschied, blickweise getrennt ../projects/double-stars/frederik-wanink/sketches/STF2746.jpg
★★★ STF2742 7m4 7m6 2.9'' 215° 2017 Equ 21h02m12.51s +07°10'47.30"
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x almost split with slight difference in brightness. At 57x split, but tight.
Rene Merting
Drachhausen (Germany)
100mm (64x) ähnlich wie STF2765 und STF2786 weiter nördlich wieder so ein knappes Pärchen bei 64x, das scheint Sternbild-typisch zu sein - beide Sterne sind fast gleich hell, der Stern im NO ist minimal heller
Uwe Pilz
Leipzig (Germany)
105mm (94x) Prachtstück! Weiß-Weißgelb. ../projects/double-stars/uwe-pilz/sketches/190930STF2742.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Lam Equ. Sky Tools says 1 delta mag but these are near equal, white, wide 3" separation.
Mark McCarthy
Fremont (California/USA)
317mm (553x) equal light orange, well split, pretty
Mark McCarthy
Fremont (California/USA)
317mm (553x) easy wide, equal brightness pair.
STF2744 AB 6m8 7m3 1.2'' 110° 2018 Aqr 21h03m03.09s +01°31'55.90"

../images/binary-star-orbits/STF2744-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2744.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Split, ~1.5", near equal yellow-orange stars
Mark McCarthy
Fremont (California/USA)
317mm (553x) Close, equal magnitude, bright yellow-white.
STF2745, 12 Aqr AB 5m8 7m5 2.5'' 197° 2017 Aqr 21h04m04.71s -05°49'23.00"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2745.jpg
STF2757 7m8 9m2 1.9'' 264° 2016 Cyg 21h04m34.72s +52°23'59.20"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr schwierig, Begleiter ganz schwach zu erkennen ../projects/double-stars/frederik-wanink/sketches/STF2757.jpg
★★★ STF2758, 61 Cyg AB 5m2 6m0 31.6'' 154° 2018 Cyg 21h06m53.95s +38°44'57.90"

../images/binary-star-orbits/STF2758-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
15x45 Clear to wide separation. Both components of orange hue. Brighter northern component seemed to go slightly into yellow. In 10x42 also clearly split, northern component of orange hue, southern component of indeterminate colour (sky not quite dark enough at the time to see 61 Cyg naked-eye). Piazzi’s Flying Star, flying more than 5” per year to the northeast, and a true physical double with a period of 678 years.
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x sind beide Sterne gut getrennt, Komponente A strahlt in einem schmutzig dunklem gelb, schwächere Komponente B leicht orange
Uwe Pilz
Leipzig (Germany)
105mm (200x) gelb und orange. Der weitere Stern im Bild ist TYC 3168-6781 ../projects/double-stars/uwe-pilz/sketches/191023_61Cygni.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) TYC 3168-5901 kann dazu dienen, den sich ändernden Positionswinkel abzuschätzen. ../projects/double-stars/uwe-pilz/sketches/180901_61Cyg.jpg
Joerg S. Schlimmer
Germany
127mm (203x) Intensive Farbe ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_61_Cyg_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
203mm (121x) 61 Cyg. Nice near equal wide orange pair, bright [18 stars in system -- if so should be an OC]
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/61%20Cygni.png
STF2762, V389 Cyg AB 5m7 8m1 3.4'' 303° 2015 Cyg 21h08m38.87s +30°12'20.50"
AC 5m7 10m2 59.3'' 229° 2007
AD 5m7 11m4 73.1'' 66° 2002
Rene Merting
Drachhausen (Germany)
100mm (64x) AB: bei 64x kann ich nordwestlich von A den schwachen Begleiter knapp getrennt ausmachen - bei 107x dann ist die Trennung eindeutig - großer Helligkeitsunterschied zwischen 2.5 und 3 Größenklassen
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB: Gelb-weiß ../projects/double-stars/uwe-pilz/sketches/191119STF2762.jpg
Mark McCarthy
Fremont (California/USA)
203mm (121x) AB: V389 Cyg. A is white, quite bloated in this poor seeing night, can see three delta mag tan color B, very close split, need seeing to settle
Mark McCarthy
Fremont (California/USA)
317mm (277x) AC: Bright white and fainter blue B, very wide separation.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Blue-white A and reddish B. 2 delta mag, ~5”
STF2765 AB 8m5 8m5 2.9'' 82° 2018 Equ 21h10m59.31s +09°32'57.90"
AC 8m5 14m2 44.2'' 167° 2015
Robert Zebahl
Leipzig (Germany)
70mm (80x) AB: At 44x pretty faint, clearly elongated, notched. At 57x almost separated. At 80x and 100x clearly separated, rather tight, matched.
Rene Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x kleben beide Sterne aneinander, eine eindeutige Einschnürung ist erkennbar - sicher wird die Trennung bei 107x - beide Sterne sind gleich hell und weiß, Komponente B vermute ich östlich - richtig geraten, denn beide haben nur 0.03 mag Helligkeitsunterschied
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: Weißgelb-Gelb ../projects/double-stars/uwe-pilz/sketches/190930STF2765.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) AB: White, more equal than the 1 delta mag Sky Tools has, about 3" sep. [AC 14th mag not seen]
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Faint, matched, slightly red tinted stars
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Well split, equal magnitude, orange pair.
STF2780 AB 6m1 6m8 1.0'' 214° 2018 Cep 21h11m48.24s +59°59'11.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach, sternenreiche Umgebung ../projects/double-stars/frederik-wanink/sketches/STF2780.jpg
H1 48 7m2 7m3 0.7'' 244° 2018 Cep 21h13m42.46s +64°24'15.10"

../images/binary-star-orbits/H1-48-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (270x) Clearly elongated, of equal brightness with partly visible, slight notching.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/SAO19257.jpg
STF2783 7m7 8m1 0.7'' 352° 2017 Cep 21h14m04.90s +58°17'49.80"

../images/binary-star-orbits/STF2783-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht leicht trennbar wegen Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STF2783.jpg
STF2786 7m5 8m2 2.8'' 189° 2016 Equ 21h19m39.36s +09°31'30.30"
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x elongated, slightly notched. At 57x barely split with visible, but little difference in brightness.
Rene Merting
Drachhausen (Germany)
100mm (64x) bei 64x sind beide Komponenten ganz knapp getrennt erkennbar - Komponente A im Norden ist etwas heller als B
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/190930STF2786.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Sharp white and B is about 1 delta mag and duller, almost bluish.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pale yellow stars, B a slightly darker tint though 1 delta mag dimmer, well split
Mark McCarthy
Fremont (California/USA)
317mm (553x) Easy. near equal white.
★★ STF2789 AB 7m7 7m9 6.8'' 115° 2018 Cyg 21h19m58.84s +52°58'44.10"
Robert Zebahl
Leipzig (Germany)
70mm (44x) At 22x almost separated. The double star appeared strikingly orange and forms a conspicuous, nearly isosceles triangle with neighbouring stars. At 44x clearly separated, relatively close together with a small difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-07-28_stf2789.jpg
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x zwei gleichhelle ganz dicht beieinander stehende weiße Lichtpünktchen, ganz knapp getrennt - wunderschön mit dieser Teleskopöffnung
STT437 AB 7m2 7m4 2.4'' 19° 2018 Cyg 21h20m50.12s +32°27'10.20"

../images/binary-star-orbits/STT437-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) At 57x separated, but close together. Near, slightly brighter star in nice contrast. The double star shows a distinct orange coloration. At 100x small difference in brightness visible.
Rene Merting
Drachhausen (Germany)
100mm (107x) bei 64x eine schöne 8, die beiden etwa gleich hellen Sterne berühren sich noch ganz leicht und scheinen fast getrennt zu sein - bei 107x ist die Trennung dann knapp aber deutlich
Uwe Pilz
Leipzig (Germany)
105mm (200x) orange und orangegelb, schön auch bei 88x ../projects/double-stars/uwe-pilz/sketches/191119STT437.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach ../projects/double-stars/frederik-wanink/sketches/STT437.jpg
STFB11, 1 Peg AB 4m2 9m3 36.3'' 312° 2019 Peg 21h22m05.13s +19°48'15.70"

../images/binary-star-orbits/STFB11-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STFB11-AB-orbit-solution-2.jpg ../images/binary-star-orbits/STFB11-AB-orbit-solution-3.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) der helle Stern ist weiß. ../projects/double-stars/uwe-pilz/sketches/191014_1Peg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 1 Peg: Easy yellow-orange & wide separated B
STF2793 AB-C 7m4 9m0 26.4'' 241° 2014 Equ 21h25m05.66s +09°23'02.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x easily separable with relatively large angular distance. C component much fainter. At 44x AB appeared white-yellowish, C somewhat reddish.
Rene Merting
Drachhausen (Germany)
100mm (20x) bei 20x einfach zu trennen - Komponente AB im Osten weiß, Komponente C im Westen ist gut 1.5 Größenklassen schwächer und strahlt kupferbraun - auf 20x zurück kann man den Doppelstern ebenfalls noch gut trennen, B ist dann allerdings schon sehr schwach
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/190930STF2793.jpg
STF2797, KP Peg 7m4 8m8 3.5'' 217° 2011 Peg 21h26m41.14s +13°41'17.80"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Split at 57x, but very tight with clear difference in brightness. At 100x well split. The faint B component was slightly outside the first diffraction ring of the primary component.
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/191014_STF2797.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) KP Peg. Light yellow A and ~4", 1.5 delta mag orange B
Berthold Fuchs
Wiesbaden (Germany)
130mm v.close DS ../projects/double-stars/berthold-fuchs/photographs/STF2797.png
STF2799 AB 7m4 7m4 1.8'' 259° 2018 Peg 21h28m52.79s +11°05'05.20"

../images/binary-star-orbits/STF2799-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) At 100x, barely, at 128x clearly split with equally bright components.
Uwe Pilz
Leipzig (Germany)
105mm (200x) beide Komponenten gelb ../projects/double-stars/uwe-pilz/sketches/191014_STF2799.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Very nice pair, only slightly unequal, ~3"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Equal yellow-orange
STF2804 AB 7m7 8m0 3.7'' 2018 Peg 21h32m58.30s +20°42'44.50"

../images/binary-star-orbits/STF2804-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) Clearly split, pretty close, moderately uneven. The primary components looked slightly orange. Very nice pair.
Uwe Pilz
Leipzig (Germany)
105mm (88x) der südliche Stern ist einen Hauch heller. Gelb und orange. ../projects/double-stars/uwe-pilz/sketches/191014_STF2804.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Nice light orange and light blue, sharp, 1 delta mag 3". pretty.
LSL1, Lassell 1 AB 10m6 11m7 82.1'' 82° 2015 Cyg 21h34m45.16s +32°04'42.60"
AC 10m6 12m1 106.1'' 127° 2015
AD 10m6 11m9 21.2'' 134° 2015
AE 10m6 13m5 10.5'' 331° 2015
BF 11m7 12m1 18.4'' 210° 2015
CG 12m1 14m4 11.5'' 199° 2015
Uwe Pilz
Leipzig (Germany)
105mm (200x) das südliche Paar konnte nur indirekt erkannt werden und blieb schwierig ../projects/double-stars/uwe-pilz/sketches/191119Lasell1.jpg
Robert Zebahl
Leipzig (Germany)
152mm (180x) Comparatively wide pairs with rather faint components. Observation at nearly full moon. Components A & D easy, B relatively well and C & F quite faint. Components E & G not visible. Overall unspectacular under these conditions.
STF2816 AC 5m7 7m5 11.8'' 121° 2018 Cep 21h38m57.61s +57°29'20.50"
AD 5m7 7m5 20.6'' 339° 2018
Uwe Pilz
Leipzig (Germany)
105mm (200x) gehört zu einem Sternentstehungsgebiet ../projects/double-stars/uwe-pilz/sketches/stf2816.jpg
75 Cyg AC20 AB 5m3 10m1 2.7'' 327° 2008 Cyg 21h40m11.11s +43°16'25.80"
STTA221 AC 5m3 10m3 62.2'' 253° 2003
Uwe Pilz
Leipzig (Germany)
105mm (137x) recht weit, einfach ../projects/double-stars/uwe-pilz/sketches/75Cyg.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb
BU688 AB 8m1 8m6 0.5'' 198° 2016 Cyg 21h42m33.41s +41°02'51.00"

../images/binary-star-orbits/BU688-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) länglich, unsicher ../projects/double-stars/frederik-wanink/sketches/BU688.jpg
mu Cyg, 78 Cyg, STF2822 AB 4m8 6m2 1.6'' 321° 2018 Cyg 21h44m08.57s +28°44'33.40"

../images/binary-star-orbits/STF2822-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
60mm (198x) Aufhellung innerhalb des ersten Rings
Robert Zebahl
Leipzig (Germany)
70mm (128x) At 128x I was able to see this double at least elongated.
Robert Zebahl
Leipzig (Germany)
200mm (171x) Quite well split with noticeable fainter component.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2822.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and light orange pair, ~1", 1 delta mag. Very pretty, subtle colors
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow, 1 delta mag, 2-3”
STF2843 AB 7m0 7m3 1.4'' 150° 2016 Cep 21h51m37.25s +65°45'09.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell, einfach ../projects/double-stars/frederik-wanink/sketches/STF2843.jpg
★★ STF2841 A-BC 6m5 8m0 22.4'' 110° 2018 Peg 21h54m17.44s +19°43'05.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x easy to separate with considerable difference in brightness. The primary component appeared slightly yellowish-orange, the fainter component greyish-blue. The slight color contrast was especially visible at 44x.
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/191014_STF2841.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Very wide 2 delta mag pair, white and light blue [COU 432 is the AB, 0.1" near equal, was 0.2" at discovery!]
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange & blue, very wide separation, ~2 magnitude difference.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF2841.png
STT457 6m0 8m2 1.4'' 246° 2016 Cep 21h55m30.99s +65°19'14.90"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Beule in der Beugungsscheibe, nicht einfach ../projects/double-stars/uwe-pilz/sketches/stt457_2.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter berührt den Beugungsring
Uwe Pilz
Leipzig (Germany)
105mm (360x) „Zipfel“ am ersten Ring, nicht einfach ../projects/double-stars/uwe-pilz/sketches/stt457_1.jpg
STT458 AB 7m2 8m4 1.0'' 348° 2016 Cep 21h56m27.30s +59°47'42.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) ../projects/double-stars/frederik-wanink/sketches/STT458.jpg
BU694, V1942 Cyg AB 5m7 7m8 1.0'' 2016 Cyg 22h02m56.68s +44°38'59.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger, Seeing schlecht ../projects/double-stars/frederik-wanink/sketches/BU694.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 2 delta mag, just resolves, 1"
STF2872 A-BC 7m1 8m0 21.7'' 316° 2018 Cep 22h08m36.04s +59°17'22.20"
AD 7m1 11m8 117.3'' 153° 2014
BC 8m0 8m0 0.8'' 297° 2018

../images/binary-star-orbits/STF2872-BC-orbit.jpg

Rene Merting
Drachhausen (Germany)
100mm (20x) A-BC: bei 32x einfach zu trennen, die B-Komponente im NW ist nur knapp schwächer - dezenter Farbunterschied, A leuchtet weiß-bläulich und BC weiß-gelblich - zurück auf 20x zeigt sich der Doppelstern weiter gut getrennt
Frederik Wanink
Itterbeck (Germany)
254mm (640x) BC: BC in ruhigen Momenten trennbar ../projects/double-stars/frederik-wanink/sketches/STF2872.jpg
STF2879 AB 8m0 8m3 0.7'' 233° 2018 Cep 22h10m59.56s +63°23'58.50"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) ähnlich hell, gut trennbar ../projects/double-stars/frederik-wanink/sketches/STF2879.jpg
HO180 AB 7m9 8m7 0.8'' 242° 2017 Lac 22h15m48.59s +43°54'02.60"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger zu trennen ../projects/double-stars/frederik-wanink/sketches/HO180.jpg
KR60, DO Cep, Kruger 60 AB 9m9 11m4 1.5'' 266° 2016 Cep 22h27m59.20s +57°41'43.80"

A detailed article about Kruger 60 was published in the "Journal of Double Star Observations" by Wilfried R.A. Knapp and John Nanson. Another article is about the origin of the comet 2I/Borisov (C/2019 Q4) in connection with Kruger 60.

../images/binary-star-orbits/KR60-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) Unsicher – nur des Positionswinkel wurde zwar blickweise erkannt, aber die Komponenten verwechselt.
Robert Zebahl
Leipzig (Germany)
152mm (150x) Observed at magnifications between 129x and 300x. The seeing and transparency (Bortle 6-) were only average. The rather faint B component seemed to appear in few moments.
Robert Zebahl
Leipzig (Germany)
152mm (150x) The seeing was more average (3/5). Observation under suburban conditions (Bortle 6, SQM-L 19.1). Initially observed at 270x, later at 300x. The extremely faint companion was always visible at the same position if the air was steady enough. Difficult because of the low magnitude!
Uwe Pilz
Leipzig (Germany)
320mm (387x) äußerst schwierig, nur blickweise sichtbar ../projects/double-stars/uwe-pilz/sketches/191002_Krueger60.jpg
STF2909, zet 2 Aqr AB 4m3 4m5 2.5'' 161° 2018 Aqr 22h28m49.81s -00°01'12.20"

../images/binary-star-orbits/STF2909-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (240x) einfach ../projects/double-stars/frederik-wanink/sketches/STF2909.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Very bright white, equal magnitude, fairly close ~2".
STF2934 8m6 9m6 1.4'' 57° 2016 Peg 22h41m51.68s +21°25'53.00"

../images/binary-star-orbits/STF2934-orbit-solution-1.jpg ../images/binary-star-orbits/STF2934-orbit-solution-2.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger wegen schwacher Sterne ../projects/double-stars/frederik-wanink/sketches/STF2934.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) 1.5 delta mag, well split, ~1.5", bluish white stars
STF2935 AB 6m8 7m9 2.4'' 307° 2016 Aqr 22h43m03.40s -08°18'41.20"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2935.jpg
STT476 A-BC 7m4 7m1 0.5'' 304° 2018 Lac 22h43m04.32s +47°10'07.50"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) länglich ../projects/double-stars/frederik-wanink/sketches/STT476.jpg
BU382 AB 6m0 7m8 0.7'' 244° 2016 Lac 22h53m40.16s +44°44'57.10"

../images/binary-star-orbits/BU382-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, Helligkeitsunterschied stark ../projects/double-stars/frederik-wanink/sketches/BU382.jpg
COU240 7m7 8m8 0.8'' 289° 2017 Peg 22h56m23.71s +22°57'21.20"
Robert Zebahl
Leipzig (Germany)
152mm (300x) Borderline observation with rather less good seeing. The fainter companion could be detected in the correct position angle to some extent as a small bulge in the diffraction disk.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) in ruhigen Momenten getrennt ../projects/double-stars/frederik-wanink/sketches/COU240.jpg
BU385 AB 7m4 8m2 0.7'' 84° 2018 Peg 23h10m17.15s +32°29'13.40"

../images/binary-star-orbits/BU385-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) in ruhigen Momenten getrennt ../projects/double-stars/frederik-wanink/sketches/BU385.jpg
72 Peg, BU720 5m7 6m1 0.6'' 107° 2018 Peg 23h33m57.19s +31°19'31.00"

../images/binary-star-orbits/BU720-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/72Peg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 72 Peg. Small, hard, faint point very tight to A, but split. Stays with seeing.
STT507 AB 6m8 7m8 0.7'' 323° 2018 Cas 23h48m39.03s +64°52'35.30"

../images/binary-star-orbits/STT507-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) eindeutig zu trennen, 3er System ../projects/double-stars/frederik-wanink/sketches/STT507.jpg
STT510 AB 7m9 8m4 0.6'' 120° 2018 And 23h51m33.03s +42°04'57.70"

../images/binary-star-orbits/STT510-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) 3er System, gerade getrennt zu sehen ../projects/double-stars/frederik-wanink/sketches/STT510.jpg
STF3049, sigma Cas, 8 Cas AB 5m0 7m2 3.1'' 326° 2017 Cas 23h59m00.53s +55°45'17.80"
AC 5m0 10m4 106.0'' 66° 2014
Robert Zebahl
Leipzig (Germany)
70mm (120x) AB: At 57x barely separated, where the B component appears as a faint tiny star. At 120x the B component is clearly visible and slightly elongated on the first diffraction ring of the primary component. Very fine. ../projects/double-stars/robert-zebahl/sketches/2019-08-25_sigma_cas.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: Begleiter gerade außerhalb des Beugungsrings
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: White A to slight yellow B, 3-4", 1.5 delta mag.
STF3050 AB 6m5 6m7 2.5'' 342° 2018 And 23h59m29.33s +33°43'26.90"

../images/binary-star-orbits/STF3050-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (83x) At 83x seen as '8'. From 100x to 166x seen as '8', temporarily visible with space between.
Robert Zebahl
Leipzig (Germany)
70mm (100x) Wonderful double star. Easy to split with slight difference in brightness.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfaches Paar, gleich hell ../projects/double-stars/frederik-wanink/sketches/STF3050.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Nice near equal yellow-white, ~3"