Double Stars - Orbits

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 334
Visual Observations 827
Sketches 162
Photographs 8
Observers 14
Berthold Fuchs, Sarah Gebauer, Christopher Hay, Gerd Kohler, Karsten Kopp, Winfried Kräling, Jens Leich, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, Jörg S. Schlimmer, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000)
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

René Merting
Drachhausen (Germany)
100mm (32x) bei 64x klare Trennung - ein relativ schwaches Pärchen - zurück auf 32x stehen beide dichter zusammen und können knapp getrennt werden
Uwe Pilz
Leipzig (Germany)
105mm (144x) Der nahe gelegene ß997 konnte nicht getrennt werden ../projects/double-stars/uwe-pilz/sketches/191123stt547.jpg
STF3060 AB 9m3 9m7 3.4'' 136° 2016 Peg 00h05m55.56s +18°04'34.40"

../images/binary-star-orbits/STF3060-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close, ~3", equal brightness, pretty faint.
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.)
René Merting
Drachhausen (Germany)
320mm (320x) erst bei 320x ist Komponente B knapp getrennt nördlich von A zu erkennen - beide Sterne sind relativ hell und haben relativ große Beugungsscheibchen, so dass die Trennung nur knapp zu sehen ist - nicht wirklich schön, wenn man in den Nächten vorher mit einem Refraktor Doppelsterne beobachtet hat
STF2 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
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.
BU394 AB 8m5 8m8 0.8'' 278° 2017 Cas 00h30m45.56s +47°31'47.50"

../images/binary-star-orbits/BU394-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine, pop split with seeing, near equal.
STT12, lam Cas 5m3 5m6 0.2'' 210° 2010 Cas 00h31m46.32s +54°31'20.30"

../images/binary-star-orbits/STT12-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Lambda Cas: Maybe out of round? Marginal
★★★ 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.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist Komponente A so hell, dass B trotz des augenscheinlich großen Abstandes von 13,4" nur knapp getrennt zu sehen ist - Komponente A ist gleißend hell-gelb, B dürfte mindestens 3 Größenklassen schwächer sein und wirkt dadurch dumpfer
Uwe Pilz
Leipzig (Germany)
105mm (53x) AB: leicht
Uwe Pilz
Leipzig (Germany)
105mm (288x) kein Sternentstehungsgebiet! ../projects/double-stars/uwe-pilz/sketches/etaCas.jpg
Sarah Gebauer
Germany
150mm (54x) AB: bei 54x erst nur einen Stern gesehen, doch da, ganz schwach darunter doch die wesentlich schwächere, zweite Komponente entdeckt ../projects/double-stars/sarah-gebauer/sketches/20200731%20Eta%20Cas%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice yellow pair. A is a red tainted yellow, B is cleaner.
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x ein echt fetter Farbkontrast, Komponente A ist gleißend hell und zitronengelb, B zeigt sich knallig orange - beide Sterne sind gut getrennt voneinander zu beobachten - sehenswert
BU232 AB 8m5 8m8 0.9'' 256° 2018 Cas 00h50m25.10s +50°37'49.60"
AB-C 8m5 10m1 24.5'' 300° 2018

../images/binary-star-orbits/BU232-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (533x) AB: Nice, well split, near equal. Part of a triple, the next one much wider in same PA and two delta mag. [AB-C is 10.06 24.5"]
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Neat near equal orange and yellow. Split with seeing, 1".
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB-C: C 2 delta mag fainter than B, about 25" separated, is the +1 star with BU232AB
HLD4 9m0 9m5 0.3'' 38° 2007 Cas 00h57m35.79s +54°23'44.80"

../images/binary-star-orbits/HLD4-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Yellowish stars, nicely split, a near equal. [this pair is widening, will get a little easier, was 1" at discovery in 1881 -- Holden, Lick director.]
A2901 7m1 7m8 0.4'' 64° 2018 Cas 01h01m30.15s +69°21'30.70"

../images/binary-star-orbits/A2901-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (885x) Elongated to notched with seeing
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
STF113, 42 Cet A-BC 6m5 7m0 1.6'' 22° 2018 Cet 01h19m48.30s -00°30'32.50"

../images/binary-star-orbits/STF113-A-BC-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Pale orange and slight blue, PA to NW, ~1 delta mag. 2". Pretty.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Gold and blue, pretty. 2" PA to north.
STF115 AB 7m1 7m3 0.5'' 160° 2018 Cas 01h23m21.27s +58°08'35.60"

../images/binary-star-orbits/STF115-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Peanut, near equal. in nearly the same FOV with Detla Cas, V 465 pretty orange star, and NGC 457, a loose moderately rich open cluster
STF158 AB 9m0 9m4 2.2'' 272° 2018 Tri 01h46m44.07s +33°09'45.50"

../images/binary-star-orbits/STF158-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) Nice split, pretty wide considering low magnification. Orange-yellow stars about half delta mag
HO311 8m2 7m8 0.4'' 178° 2018 Ari 01h51m13.34s +24°39'08.00"

../images/binary-star-orbits/HO311-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Nice clear split with seeing, more near equal but there is a noticeable magnitude difference, white stars
BU260 8m8 9m0 1.1'' 261° 2018 Ari 01h53m14.21s +15°26'00.30"

../images/binary-star-orbits/BU260-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (533x) Fine pair, well split, half delta mag
BU513, 48 Cas AB 4m7 6m7 0.6'' 320° 2013 Cas 02h01m57.55s +70°54'25.40"

../images/binary-star-orbits/BU513-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Searched around the swollen, shimmering bright A star disk and felt there was a faint close B trying to resolve in the first diffraction at 553x. Apodizing mask cleaned up the image but no B resolved
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!
STF234 AB 8m7 9m4 0.6'' 222° 2012 Cas 02h17m23.00s +61°21'06.50"

../images/binary-star-orbits/STF234-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (885x) Light orange star, definitely elongated, maybe notched, but no convincing split. Tough little Struve.
A2329 9m4 9m6 0.5'' 101° 2018 Cet 02h27m45.86s +04°25'55.90"

../images/binary-star-orbits/A2329-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Split at 533x but used barlow to confirm the PA accurately since this is a short period pair. Nicely split orange stars, half delta mag. Seeing it now at nearly the furthest extent of its orbit, it will become more difficult with time. The pair is a "mere" 55.91 lightyears away
★★ 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
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 142x zeigt sich Komponente B im SW mit gut einem Drittel das Abstandes AC, Helligkeitsunterschied 1.5 bis 2 Größenklassen
AC: bei 64x getrennt, schöner Farbkontrast, Komponente A ist weiß mit einem Stich ins Gelbe, C leicht bräunlich
AD: bei 32x extrem weiter Abstand zwischen A und D, Helligkeitsunterschied mehr als 2 Größenklassen (laut Stelle Doppie sogar 3.85 mag)
Uwe Pilz
Leipzig (Germany)
105mm (200x) Dreifachstern lohnend ../projects/double-stars/uwe-pilz/sketches/iotaCas.jpg
Sarah Gebauer
Germany
150mm (160x) bei 160x sind die Komponenten AC getrennt, B leider nicht, die schwache Komponente C versinkt fast im Strahlen der hellen Komponente A, ein sehr reizvoller Anblick! Von Komponente D wusste ich während der Beobachtung noch nichts, sie taucht unter den Feldsternen der Zeichnung auch auf ../projects/double-stars/sarah-gebauer/sketches/20200731%20Iota%20Cas%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Component D easy to see even at lowest magnification. Component C is also easily visible at 49x. At 69x the component B is indicated, at 100x clearly visible. C appears slightly grey-bluish and obviously fainter than B. Grand sight at 129x!
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.
A2906 & STF314 A2906 AB 7m3 8m8 0.3'' 115° 2018 Per 02h52m52.03s +52°59'50.60"
STF314 AB-C 7m0 7m3 1.6'' 316° 2018

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

Robert Zebahl
Leipzig (Germany)
152mm (129x) STF314 (AB-C): Beautifully separated, quite close together. Difference in brightness visible, but rather small. Easy to find and bright. Very nice.
Frederik Wanink
Itterbeck (Germany)
254mm (460x) STF314 (AB-C): ähnlich hell ../projects/double-stars/frederik-wanink/sketches/STF314.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) A2906 (AB): This is the brighter of the STF 314 pair. I have a feeling it is slightly elongated but nothing certain.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF314 (AB-C): a nice half delta mag pair ~2"
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF314 (AB-C): near equal brightness, AB more yellow yellow-white of the two, ~2 disk separation
BU525 7m5 7m5 0.5'' 276° 2018 Ari 02h58m53.11s +21°37'03.90"

../images/binary-star-orbits/BU525-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Star is decidedly not round but does not show shape other than a stretching.
STF333, eps Ari AB 5m2 5m6 1.4'' 211° 2018 Ari 02h59m12.73s +21°20'25.60"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Equal bright white just split with seeing.
STF360 8m0 8m3 2.7'' 126° 2015 Per 03h12m09.59s +37°13'03.30"

../images/binary-star-orbits/STF360-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (67x) Pretty faint double star. At 57x barely separable with almost touching diffraction disks. The components seemed similarly bright. At 67x still very close together, at 100x easy to separate.
Robert Zebahl
Leipzig (Germany)
152mm (69x) Split, but close together, similarly bright. The double star appears overall slightly orange compared to the surrounding stars.
★★ STT51 8m5 8m7 0.6'' 346° 2018 Per 03h12m57.08s +44°17'14.70"

../images/binary-star-orbits/STT51-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine clean split at the finest moments, which is once every 10 seconds. 0.5", equal mag.
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
STF412, 7 Tau AB 6m6 6m9 0.8'' 349° 2018 Tau 03h34m26.62s +24°27'52.10"

../images/binary-star-orbits/STF412-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) A-B länglich
BU533 AB 7m5 7m7 1.0'' 222° 2018 Per 03h35m37.81s +31°40'48.70"

../images/binary-star-orbits/BU533-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (225x) At 129x clearly elongated, notched. At 225x just so separable with similarly bright components.
Mark McCarthy
Fremont (California/USA)
317mm (270x) Overlapping yellow-orange disks, equal mag
STF425 AB 7m5 7m6 1.9'' 59° 2018 Per 03h40m07.24s +34°06'59.30"

../images/binary-star-orbits/STF425-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (129x) Beautifully separated, relatively close together, very little difference in brightness.
★★ BU536 & S437, SAO76169 S437 AB-C 8m1 7m7 38.8'' 308° 2017 Tau 03h46m16.00s +24°11'23.50"
BU536 AB 8m1 9m4 1.1'' 178° 2016
BU536 CD 7m7 12m9 18.3'' 2015

../images/binary-star-orbits/BU536-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) in den Plejaden
STT66 8m1 8m5 1.0'' 146° 2018 Per 03h52m04.69s +40°47'50.70"

../images/binary-star-orbits/STT66-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (270x) light orange equal magnitude, split with seeing, close ~1"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Wide separation orange stars of similar brightness
STF483 7m4 9m3 1.6'' 53° 2018 Per 04h04m07.10s +39°30'35.00"

../images/binary-star-orbits/STF483-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (270x) Yellow-orange star, very close, 1", 2 delta mag.
STT531, 50 Per AB 7m3 9m7 2.7'' 353° 2018 Per 04h07m34.35s +38°04'28.30"

../images/binary-star-orbits/STT531-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (270x) AC is a finder split. The fainter of these has another star split 4", 2-3 delta mag., this is the AB pair.
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
HO328 7m4 9m1 0.4'' 358° 2016 Tau 04h17m01.22s +19°40'32.60"

../images/binary-star-orbits/HO328-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Olive shape. Light yellow-orange star, no clean split but clearly elongated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint, very close ~0.8", emerges with seeing, hair split. Marginal
STF520 8m3 8m4 0.7'' 81° 2018 Tau 04h18m14.55s +22°48'24.60"

../images/binary-star-orbits/STF520-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint elongated to overlapping disks.
STT82 AB 7m3 8m6 1.2'' 327° 2018 Tau 04h22m44.10s +15°03'22.10"

../images/binary-star-orbits/STT82-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close, 0.8" 1.5 delta mag, PA to N/NW.
STT81, 56 Per AB 5m8 9m2 4.2'' 13° 2017 Per 04h24m37.46s +33°57'34.90"

../images/binary-star-orbits/STT81-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (270x) 56 Per. Pretty yellow and slight red pair, 2 delta mag.
STF554, 80 Tau 5m7 8m1 1.5'' 16° 2015 Tau 04h30m08.60s +15°38'16.20"

../images/binary-star-orbits/STF554-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) 1" 2 delta mag, PA N. Nice!
STF572 AB 7m4 7m2 4.4'' 189° 2018 Tau 04h38m29.58s +26°56'25.60"

../images/binary-star-orbits/STF572-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) Clearly separated, easy with beautiful color contrast: A slightly orange, B white.
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
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.
STT517 AB 6m8 7m0 0.7'' 241° 2018 Ori 05h13m31.55s +01°58'03.70"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) Consistently split but images are bloated by poor seeing, yellowish white stars, <1", near equal
★★★ WNC2 A-BC 6m9 7m0 3.3'' 158° 2018 Ori 05h23m51.32s -00°51'59.80"

../images/binary-star-orbits/WNC2-A-BC-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (44x) Double star appeared elongated.
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ein extrem eng stehendes wunderschönes Pärchen zweier gleich heller gelber Sterne - keine 8 mehr, beide sind schon getrennt - bei 107x kommt etwas mehr Luft zwischen beide, aber sie scheinen auch ein wenig Farbe zu verlieren
Robert Zebahl
Leipzig (Germany)
120mm (150x) Clearly split with nearly equally bright components.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice near equal, light yellow-white stars, well split. nice pair [BC is A 847 7.67/7.84 0.3" and could have been gotten on a better night!]
Mark McCarthy
Fremont (California/USA)
508mm (533x) Easy and obvious pair, bright 7th mag stars ~3". [This was a first try at the short period list but I missed the object, which is A 847 BC, 7.67/7.84 0.3" -- need to try again.]
A848 6m9 7m9 0.3'' 179° 2016 Ori 05h25m31.08s -00°32'38.20"

../images/binary-star-orbits/A848-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (533x) Suspect elongation at 333x, at 533x I get a snowman, very definite with seeing. White stars, noticeable mag difference
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
STF742 7m1 7m5 4.2'' 275° 2019 Tau 05h36m26.38s +21°59'35.10"

Located about 0.5 degree east of Messier 1.

../images/binary-star-orbits/STF742-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (62x) Beautifully separated, relatively tight with well visible difference in brightness. Points directly toward Messier 1 and can be observed with it in one field of view. Very nice!
Robert Zebahl
Leipzig (Germany)
120mm (48x) Nice, evident double near Messier 1. Easy to split with almost equally bright components.
Robert Zebahl
Leipzig (Germany)
152mm (69x) At 49x just so, at 69x easily separable. The fainter component appeared a little warmer in terms of color. Great view together with Messier 1 in the field of view.
Robert Zebahl
Leipzig (Germany)
200mm (80x) Nice double star with nearly equally bright components.
STF749 AB 6m5 6m5 1.1'' 319° 2017 Tau 05h37m08.84s +26°55'28.30"
AC 6m5 10m5 181.6'' 299° 2011

../images/binary-star-orbits/STF749-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: I had the impression that in the correct position angle, without knowing that angle during observation, a minimal elongation could be detected. But observation is borderline and too doubtful.
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Hair-split, equal brightness white stars. Nice.
STF774, zeta Ori, 50 Ori, Alnitak AB 1m9 3m7 2.4'' 167° 2017 Ori 05h40m45.52s -01°56'33.30"
AC 1m9 9m6 58.5'' 10° 2017

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

Robert Zebahl
Leipzig (Germany)
70mm (128x) AB: Big difference in brightness. I could see the fainter component near the first ring of the Airy pattern of the brighter component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: sauber getrennt, Beugungsscheiben berühren sich gerade ../projects/double-stars/uwe-pilz/sketches/Alnitak.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Alnitak. Easy, 2 delta mag,~2", white
Mark McCarthy
Fremont (California/USA)
317mm (207x) AC: Alnitak:AC is a very faint star widely separated outside of the main star's glare.
Mark McCarthy
Fremont (California/USA)
317mm (207x) AB: about 2" and 1.5 delta mag.
BU560 7m8 8m2 1.7'' 124° 2019 Aur 05h47m24.87s +29°39'26.90"

../images/binary-star-orbits/BU560-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) Clearly visible as a double star with overlapping diffraction disks (figure '8') and small difference in brightness.
Robert Zebahl
Leipzig (Germany)
152mm (129x) Separated with very little difference in brightness, relatively tight. Overall easy.
STT119 8m1 8m9 0.7'' 355° 2009 Ori 05h47m54.88s +07°57'37.50"

../images/binary-star-orbits/STT119-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Suspect elongations with 8" 533x & 20" 533x, but image not good enough. But I got a nice clean split with apodizing mask, nearly perfrect disks. Orange stars well split, <1", about 1 delta mag
STF795, 52 Ori 6m0 6m0 1.0'' 220° 2017 Ori 05h48m00.21s +06°27'14.50"

../images/binary-star-orbits/STF795-orbit.jpg

Sarah Gebauer
Germany
150mm (125x) bei 125x und 250x nicht getrennt im April 2020
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright white, near equal magnitude, near touching disks hairline split
Mark McCarthy
Fremont (California/USA)
508mm (533x) 52 Ori. Close but well split, near equal, ivory white. with apodising mask
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
★★ BU1053 6m9 8m8 1.9'' 2019 Aur 05h53m28.64s +37°20'20.70"

../images/binary-star-orbits/BU1053-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) Border observation! Companion is temporarily visible in the correct position angle as an extremely dim brightening of the first diffraction ring of the primary component.
Mark McCarthy
Fremont (California/USA)
317mm (270x) Nice!! Blazing white and close but nicely split light blue B, 2 delta mag.
STT124 6m1 7m4 0.6'' 299° 2018 Ori 05h58m53.23s +12°48'29.80"

../images/binary-star-orbits/STT124-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (170x) Seeing not good. Bloated yellow star with bluish B just attached to the edge, like a wart. B is very faint, small.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Briefly split in the best moments, 1 second out of 10. A star yellow-white and small, hard blue B.
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
J335 8m4 9m5 1.3'' 271° 2015 Ori 06h04m08.29s +11°00'57.00"

../images/binary-star-orbits/J335-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) White A, B resolves with seeing, hairline split and two delta mag. Tough at this aperture
STT132 7m2 9m6 1.8'' 332° 2012 Aur 06h08m11.68s +37°58'57.90"

../images/binary-star-orbits/STT132-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (270x) White A and slightly red B. Fine pair. 2 delta mag.
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
STF881, 4 Lyn AB 6m1 7m7 0.6'' 149° 2016 Lyn 06h22m03.57s +59°22'19.50"

../images/binary-star-orbits/STF881-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig wegen Helligkeitsunterschied
STF932 8m3 8m5 1.6'' 305° 2017 Gem 06h34m21.57s +14°45'08.30"

../images/binary-star-orbits/STF932-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (150x) Unfortunately a nearby lamp bothered me. I could see the double star at least elongated.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very neat near equal white stars, well split
AGC1, 9 CMa, alpha CMa, Sirius AB -1m5 8m4 10.7'' 75° 2016 CMa 06h45m08.92s -16°42'58.00"

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

Uwe Pilz
Leipzig (Germany)
105mm (198x) mit ADV, ohne nicht trennbar. Eindeutig
Mark McCarthy
Fremont (California/USA)
203mm (368x) Small disk formed on diffraction spike at correct separation and PA (Feb. 2016)
Mark McCarthy
Fremont (California/USA)
317mm (443x) A faint yellow-orange disk, to the edge of Sirius A’s diffraction and just below my spider’s diffraction spike. I let Sirius pass beyond the field stop, and for an instant there was Sirius B, clearly separated, before it too passed beyond the field stop.
★★★ 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.
STT157 7m2 9m2 0.6'' 161° 2018 Mon 06h47m47.56s +00°20'24.50"

../images/binary-star-orbits/STT157-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (277x) Yellow A, widely separated from blue B. 2 magnitude difference. Did not notice 0.8" separation in A
STF958 AB 6m3 6m3 4.5'' 77° 2019 Lyn 06h48m12.29s +55°42'15.10"

../images/binary-star-orbits/STF958-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (33x) Clearly split, equally bright, close together. Nice view.
Robert Zebahl
Leipzig (Germany)
102mm (62x) Very nicely split. Both components appear similarly bright and white-yellowish.
STF982, 38 Gem AB 4m8 7m8 7.4'' 143° 2018 Gem 06h54m38.63s +13°10'40.10"

../images/binary-star-orbits/STF982-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x pretty tight with much fainter component. At 71x clearly separated with clear difference in brightness. Brighter component appeared slightly yellowish, the weaker one slightly bluish.
Robert Zebahl
Leipzig (Germany)
70mm (33x) Easy to separated with noticeable difference in brightness. The fainter component appeared slightly orange, the brighter one rather white.
Uwe Pilz
Leipzig (Germany)
105mm (130x) recht attraktiv
Mark McCarthy
Fremont (California/USA)
203mm (333x) 38 Gem. Light yellow A and blue B, quite wide, very pretty. AC much wider separation much fainter not noticed
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow and orange, 2 delta mag, wide separation
Mark McCarthy
Fremont (California/USA)
371mm (553x) Bright orange and slightly red star, 2-3 delta mag.
STF981 8m7 9m0 0.9'' 119° 2016 Gem 06h55m28.54s +30°09'42.30"

../images/binary-star-orbits/STF981-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close orange pair, equal magnitude. Clean split, ~1".
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
STT163 AB 7m2 8m2 0.2'' 99° 1997 Mon 07h01m09.85s +11°46'28.70"

../images/binary-star-orbits/STT163-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Not perfectly round AB, a faint bluish haze in the diffraction to the south. Marginal.
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
A2462 AB 9m2 9m0 0.2'' 259° 2018 Gem 07h02m37.42s +15°58'26.50"

../images/binary-star-orbits/A2462-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Short period list. Notched, noticeable magnitude difference, B star pointed in direction of apex of right triangle it forms with two other eighth magnitude stars. Light orange stars
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
STT170 AB 7m4 7m7 0.6'' 288° 2018 CMi 07h17m38.51s +09°17'31.50"

../images/binary-star-orbits/STT170-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Notched, near equal at 333x. At 667x, hairline split very easy to see, near equal white stars
STF1066, delta Gem, 55 Gem 3m5 8m2 5.4'' 234° 2017 Gem 07h20m07.39s +21°58'56.40"

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

Robert Zebahl
Leipzig (Germany)
55mm (71x) Large difference in brightness. The fainter component was well separated, but just a very tiny star.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Easy to separate with relatively large distance. The companion appeared as a tiny, faint star.
Uwe Pilz
Leipzig (Germany)
105mm (288x) erster Ring in SSW heller, zweiter nur an dieser Stelle sichtbar
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wasat = Delta Geminorum: Pretty white-yellow and red-orange pair, PA to west, ~4".
★★★ 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.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 32x wirkt der Stern leicht länglich - bei 107x stehen die beiden Sterne schön eng mit überlagernden Beugungsscheibchen, die Komponenten sind dennoch getrennt erkennbar - Komponente B im Osten ist eine halbe Magnitude schwächer - ganz schwacher Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: blauweiß-weiß ../projects/double-stars/uwe-pilz/sketches/Castor.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) AB: 13.03.2017: Beide Komponenten gelblich mit geringem Helligkeitsunterschied, bereits bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_02_alpha%20Gem_Castor.jpg
★★ STF1126 AB 6m5 7m0 0.9'' 176° 2017 CMi 07h40m06.99s +05°13'51.90"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) A bit more delta mag than listed, split, white, rather bright pair
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow, very close <1" hair-split, near equal brightness
HO247 7m7 9m2 0.4'' 259° 2010 Gem 07h46m07.95s +21°07'19.20"

../images/binary-star-orbits/HO247-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Clean split with seeing, 1 delta mag, fairly bright pair. I found the apodizing mask worked better than the 8-inch mask, gave more resolving power. The 8-inch was only snowman
BU101, 9 Pup 5m6 6m5 0.4'' 304° 2018 Pup 07h51m46.31s -13°53'52.80"

../images/binary-star-orbits/BU101-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 9 Pup. Elongated to notched, orientation correct, light orange. Very tough. [B is coming off it's furthest orbit and will be exceptionally difficult in 10 years, but easier in 15 years]
STT182 7m8 7m9 0.9'' 2017 CMi 07h52m42.12s +03°23'02.20"

../images/binary-star-orbits/STT182-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Compact white pair, more near equal than Sky Tools says, white, easy split
Mark McCarthy
Fremont (California/USA)
317mm (553x) Moderately bright A with 4 much fainter wide and close stars, forms a right triangle.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close, ~1", near equal brightness white.
STT185 7m1 7m3 0.4'' 22° 2018 CMi 07h57m16.39s +01°07'37.30"

../images/binary-star-orbits/STT185-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Without the apodizing mask I get a clean split with seeing but constant split with the mask. Light orange stars, noticeable mag difference
BU581 AB 8m5 8m8 0.4'' 226° 2018 Cnc 08h04m23.10s +12°17'23.80"

../images/binary-star-orbits/BU581-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange near equal, very small, elongated to notched.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange A is not quite round. Marginal
Mark McCarthy
Fremont (California/USA)
508mm (1067x) With apodizing mask. Beautiful clean split, almost wide, light orange stars, slight mag difference. There is a third 2x fainter star further out, might be plus one. Wow. [3rd is AB-C, 8.46/11.78 5.5"]
STF1187 AB 7m2 8m0 3.1'' 20° 2019 Cnc 08h09m30.45s +32°13'18.80"

../images/binary-star-orbits/STF1187-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) Split. Components very tight with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange, 1 delta mag, 5"
★★★ STF1196 & HUT1, zeta Cnc, 16 Cnc STF1196 AC 5m3 5m8 6.3'' 51° 2019 Cnc 08h12m12.79s +17°38'51.20"
STF1196 AB-C 4m9 5m8 6.0'' 64° 2018
STF1196 AB 5m3 6m2 1.1'' 2018
HUT1 Ca-Cb 6m2 7m1 0.3'' 233° 2018

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1196.jpg
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB-C: Easy to separate. A: light grey, B: pale orange.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C clearly split, AB obviously elongated but not split
Uwe Pilz
Leipzig (Germany)
105mm (288x) weißblau-gelb-gelb ../projects/double-stars/uwe-pilz/sketches/zetaCnc.jpg
Robert Zebahl
Leipzig (Germany)
120mm (67x) AB-C: Evident difference in brightness, easy to split. Both components of similar color.
Robert Zebahl
Leipzig (Germany)
120mm (200x) AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star! ../projects/double-stars/robert-zebahl/sketches/2019-02-24_stf1196.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: Sehr schön, 3-fach Stern, A = weißgelb, B = weißgelb, C = weißgelb ../projects/double-stars/winfried-kraeling/sketches/180408_02_Zeta%20Cnc.jpg
Sarah Gebauer
Germany
150mm (83x) AB-C: bei 83x sind AB-C sauber getrennt, laut Atlas 2020 6,1'' Abstand, die Komponenten A und B mit 1,1'' lassen sich nicht trennen, viele schöne Feldsterne dabei ../projects/double-stars/sarah-gebauer/sketches/20200411%20Zeta%20Cnc%20DSk.jpg
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) Ca-Cb: not quite round, oval/olive shaped. It is the AB-C of STF 1196.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Triple, all near equal magnitude, yellow-white. AB ~0.8", hair split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Triple, all near equal magnitude, yellow-white. AC ~6", wide split.
A551, LO Hya AB 7m0 7m1 0.4'' 63° 2018 Hya 08h28m29.16s -02°31'01.60"

../images/binary-star-orbits/A551-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) LO Hya. With apodizing mask. Easy split, noticeable half delta mag. Another fainter star further out likely +1 [The +1 is STF 1233 AB-C, 6.42/10.49 18.3". AB at furthest extent of orbit, will tighten considerably the next 20 years]
AG154 9m6 9m8 2.7'' 2019 Cnc 08h36m55.78s +23°14'49.10"

../images/binary-star-orbits/AG154-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) HO Cnc. Near equal well separated, light orange stars
★★★ 11 Hya, epsilon Hya SP1 AB 3m5 5m0 0.2'' 241° 2018 Hya 08h46m46.51s +06°25'07.70"
STF1273 AB-C 3m5 6m7 2.9'' 309° 2017
STF1273 AB-D 3m5 12m5 18.1'' 201° 2017
STF1273 AB-E 3m5 10m8 340.5'' 2015
STF1273 AB-F 3m5 10m4 406.5'' 265° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB-C: bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB-C: Epsilon Hya A is bright orange-yellow, B is much fainter and a little blue, ~3". [SP 1 AB is 3.49/5.00 0.2" not seen]
A2552 9m1 8m5 0.3'' 208° 2018 Hya 08h48m40.30s +00°56'31.00"

../images/binary-star-orbits/A2552-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow fine split. Pale yellow A and blue B, about one delta mag. Nice split, amazing [82.4 year period]
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
STF1280 AB 8m8 9m1 3.4'' 358° 2018 UMa 08h55m24.82s +70°47'39.20"

../images/binary-star-orbits/STF1280-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (72x) ein knapp getrenntes Sternpaar - beide Sterne sind annähernd gleich hell und strahlen rein weiß - bei 144x eine ordentlichere Trennung, Komponente A im Süden strahlt in einem wärmeren Weiß
HJ2477, iot UMa A-BC 3m1 9m2 2.4'' 90° 2017 UMa 08h59m12.45s +48°02'30.60"

../images/binary-star-orbits/HJ2477-A-BC-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (213x) Iota UMa = Talitha. Using 25mm occulting bars with barlow, no mask, putting the bright star's diffraction spikes under the bars, I can see the hard point of the B star, brighter & closer than Procyon B outside of A's glare. One other field star. [HJ 2477's period is 2735 years. The short period is BC is HU 628 9.90/10.10 0.9" 39 year period -- how in the world did he see that?]
★★ 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
STF1321 AB 7m8 7m9 17.0'' 98° 2018 UMa 09h14m22.79s +52°41'11.80"
AC 7m8 14m5 145.7'' 64° 2010
AD 7m8 11m9 136.4'' 129° 2015

../images/binary-star-orbits/STF1321-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-11: At 22x pretty wide pair with equally bright components. Striking colors: slightly orange & white-bluish, but it was a bit difficult to assign the colors to the components. At 44x slightly better color perception.
STF1332 7m9 8m1 5.9'' 29° 2015 Cnc 09h17m19.21s +23°39'09.80"

../images/binary-star-orbits/STF1332-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal wide pair, ~5", maybe half delta mag
STF3121 AB 7m9 8m0 0.5'' 205° 2017 Cnc 09h17m53.45s +28°33'37.70"

../images/binary-star-orbits/STF3121-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) IP Cnc Split at 533x, used 1067x to recheck orientation. With apodizing mask. Light yellow-orange stars, nice and clean split, very slight mag difference. Real nice
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
STF1338 AB 6m7 7m1 1.1'' 314° 2017 Lyn 09h20m59.40s +38°11'17.90"

../images/binary-star-orbits/STF1338-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Wonderful light yellow stars, near equal, ~1" separation
STT201 AB 8m5 9m5 1.4'' 206° 2017 Leo 09h23m54.50s +27°54'00.00"

../images/binary-star-orbits/STT201-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) Extremely fine split, with seeing only, finest of the night, significant mag difference, just above 1" separation
★★ STF1355 7m7 7m8 1.8'' 357° 2018 Hya 09h27m16.69s +06°13'59.00"

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, equally bright. At 80x detectable notch. At 100x and 133x clearly visible as figure '8'. Near the double star STF 1348.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1348, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow pair, near equal, very nice, ~2"
HU1128, 11 LMi 4m8 12m5 6.7'' 61° 2012 LMi 09h35m39.50s +35°48'36.40"

../images/binary-star-orbits/HU1128-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) 11 LMi: Very faint A & extremely faint B, wide separation. From the orbital chart this is approaching maximum elongation now (May 2017), by 2143 it will be 1". Only 39 light years away.
STF1374 AB 7m3 8m7 2.8'' 311° 2017 LMi 09h41m21.88s +38°57'01.90"

../images/binary-star-orbits/STF1374-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-01: Separable at 67x, but difficult due to the bright primary component. Clearly separable at 80x and higher magnifications with a significant difference in brightness. The companion stands close to the primary component and appears as a tiny star. Nice view.
Robert Zebahl
Leipzig (Germany)
120mm (168x) At 50x elongated, at 75x seen as '8'. At 168x clearly split with obviously fainter component.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pretty orange-yellow stars, ~2 delta mag, ~3 separation
HO369 AB 8m0 9m8 0.4'' 99° 2011 LMi 09h51m09.34s +36°29'20.80"

../images/binary-star-orbits/HO369-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) With 533x I can tell this is not single, but the elongation is too tentative. At 1067x the best I can manage is elongated notched, with seeing. Seeing and transparency are not good enough
STT208, phi UMa 5m3 5m4 0.5'' 304° 2017 UMa 09h52m06.36s +54°03'51.40"

../images/binary-star-orbits/STT208-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) länglich, schwierig
AC5, gam Sex AB 5m4 6m4 0.5'' 41° 2016 Sex 09h52m30.47s -08°06'17.70"

../images/binary-star-orbits/AC5-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Gamma Sex: I get a split with seeing of nearly equal orange yellow stars, only momentarily
STT213 AB 8m6 9m8 1.1'' 121° 2017 Leo 10h13m08.88s +27°25'10.50"

../images/binary-star-orbits/STT213-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright yellow A, ~2 magnitudes fainter B, very wide separation.
STT215 7m2 7m5 1.5'' 176° 2019 Leo 10h16m16.05s +17°44'24.60"

../images/binary-star-orbits/STT215-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) Appeared partly separated, partly as '8'. Brightness seemed to be equal.
Uwe Pilz
Leipzig (Germany)
105mm (288x) trennbar bei 120x
Mark McCarthy
Fremont (California/USA)
317mm (277x) very close split (1.7" separation) near equal bright white stars
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal light yellow stars, ~1.5"
STF1423 9m4 10m1 0.7'' 308° 2018 Leo 10h19m10.64s +20°33'48.10"

../images/binary-star-orbits/STF1423-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Tough! Elongated to hairline split.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Split with seeing, light orange A and very faint, ~3 delta mag B, very close, within diffraction ring <1"
★★ 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.
Robert Zebahl
Leipzig (Germany)
102mm (125x) Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) very bright double star, slight colour contrast
Uwe Pilz
Leipzig (Germany)
105mm (120x) schon bei 37x sehenswert; trennbar bei 55x; orange-blauweiß
Robert Zebahl
Leipzig (Germany)
120mm (66x) At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: merklicher Helligkeitsunterschied, A = gelb-orange, B = gelb-orange ../projects/double-stars/winfried-kraeling/sketches/180408_04_Gamma%20Leo.jpg
Sarah Gebauer
Germany
150mm (83x) bei 83x sauber getrennt, ein leichter Farbunterschied (Weiß und helles Gelb) sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200411%20Gamma%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Algieba: Bright yellow and yellow-orange pair, 1 delta mag, 4-6"
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.
René Merting
Drachhausen (Germany)
320mm (240x) bei 240x sehe ich zwei ordentlich getrennte Sterne (naja, nicht wirklich Sterne, sondern wild zappelnde Glitzerbällchen) - Komponente A strahlt in einem zarten Gelb, B ist weiß - zurück auf 144x sehe ich nur ein Stäbchen mit leichter Einschnürung, so wild tanzen die Sterne
Mark McCarthy
Fremont (California/USA)
508mm (333x) Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire
STF1426 AB-C 7m3 9m4 7.6'' 2018 Leo 10h20m32.32s +06°25'47.60"
AB 8m0 8m3 0.9'' 313° 2018

../images/binary-star-orbits/STF1426-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 213x in guten Momenten als Stäbchen erkennbar
AB-C: bei 107x ist nördlich vom Hauptstern AB eine gut 2 Größenklassen schwächere Komponente erkennbar - AB ist weiß, C ist grau
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: Quite large angular distance and therefor easy to separate. The C component was pretty faint.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB: At first glance elongated, on closer look visible as '8'.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C easily split, A-B not detectable as double
Uwe Pilz
Leipzig (Germany)
105mm (288x) A-B länglich, C weit
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Split with seeing, white, very close, near equal. Part of plus one, a two delta mag not far away
★★ STT216 7m4 10m3 2.3'' 231° 2016 Leo 10h22m43.81s +15°20'39.70"

../images/binary-star-orbits/STT216-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (277x) A white and bright (7.3), B red & much fainter (10.3), a close split (2").
Mark McCarthy
Fremont (California/USA)
508mm (333x) Yellow and very much fainter orange B, 1 delta mag, ~4" separated
STF1429 9m1 9m3 0.8'' 155° 2017 Leo 10h25m01.79s +24°36'44.10"

../images/binary-star-orbits/STF1429-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tough. Faint, need averted vision to brighten and sharpen. Elongated to clean split in the best moments with seeing, near equal magnitude
Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated to hairline at 333x, split at 533x. Light orange stars, near equal
STT217 7m8 8m6 0.8'' 149° 2017 Leo 10h26m53.01s +17°13'09.90"

../images/binary-star-orbits/STT217-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Just split cleanly, ~1 delta mag, yellow-tinged white stars. Nice close pair
HU879, bet LMi 4m6 6m0 0.5'' 228° 2017 LMi 10h27m53.09s +36°42'26.90"

../images/binary-star-orbits/HU879-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Beta LMi. With apodizing mask I see an out of roundness / olive shape, too much glare to tell orientation, no other field stars
STF1439 8m3 8m9 1.4'' 73° 2019 Leo 10h30m06.42s +20°48'04.30"

../images/binary-star-orbits/STF1439-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Very clean images, light yellow-orange stars, ~1 delta mag, well split, very pretty
STF1454 9m0 11m0 1.3'' 358° 2016 LMi 10h38m11.10s +26°36'24.80"

../images/binary-star-orbits/STF1454-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Quite tough: averted vision only, very tight, similar magnitude, when seeing stills.
STF1457 7m7 8m2 1.9'' 334° 2019 Sex 10h38m43.14s +05°44'02.90"

../images/binary-star-orbits/STF1457-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (142x) bei 107x sehe ich in guten Momenten eine Stäbchen, manchmal auch schon leichte Einschnürungen - bei 142x zeigt sich das Sternpaar deutlich als 8 und mit etwas Geduld auch getrennt - B steht im NO und ist eine halbe Größenklasse schwächer - bei 213x dann eindeutige Trennung
Mark McCarthy
Fremont (California/USA)
508mm (333x) Attractive bright sunny yellow pair, more than 2" separation, slight mag difference
A2768 6m9 8m4 0.6'' 240° 2018 Sex 10h42m37.53s +03°34'58.90"

../images/binary-star-orbits/A2768-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (277x) Feels like a not round disk, but uncertain.
Mark McCarthy
Fremont (California/USA)
508mm (533x) 34 Sex. Surprisingly difficult. Light orange A and a very small 2 delta mag pin prick appears within the first diffraction ring, so about 0.5" separation. Very tough. With seeing only
A2771 9m2 9m7 0.6'' 112° 2018 Sex 10h44m38.71s +05°29'55.00"

../images/binary-star-orbits/A2771-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated with 333x but a good clean split with 533x. Stars settle to fine points with seeing , ~1 delta mag, ~0.5" separation
STT228 8m2 8m9 1.7'' 170° 2017 Leo 10h47m16.93s +22°34'32.00"

../images/binary-star-orbits/STT228-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) With fine focus, split with seeing, ~1 delta mag, ~1" separation. Pretty tough needed 533x to split, elongated at 333x
★★ STT229 7m6 7m9 0.7'' 256° 2017 UMa 10h48m02.55s +41°06'35.80"

../images/binary-star-orbits/STT229-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Just wider than a thin hair split of equal white stars, ~8th mag. 0.63"! in 40 years it will be 0.2"
UC2059 & HDS1574 & COU1422 UC2059 AB 7m5 10m7 46.9'' 46° 2015 UMa 11h01m45.73s +36°40'41.60"
HDS1574 Aa-Ab 7m6 11m1 0.2'' 26° 2019
COU1422 Ba-Bb 11m2 11m5 0.6'' 38° 2008

../images/binary-star-orbits/HDS1574-Aa-Ab-orbit.jpg ../images/binary-star-orbits/COU1422-Ba-Bb-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) UC2059 (AB): Pretty well separated, 1.5 delta mag, not remarkable as I hoped given the odd designation.
Mark McCarthy
Fremont (California/USA)
762mm (1219x) COU1422 (Ba-Bb): Cou 1422 is a pair of 11th magnitude stars very close to UC 2059 -- best I could get of Cou 1422 was an elongation with the seeing. Tried 1219x without improving the elongation.
BU1077, alpha UMa, 50 UMa, Dubhe AB 2m0 5m0 0.8'' 342° 2017 UMa 11h03m43.84s +61°45'04.00"
AC 2m0 7m2 370.0'' 205° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: 2020-04-07: Very wide, uneven & inconspicuous pair. A appeared white-yellowish, for B I could not detect any color.
★★ HO378 AB 8m2 9m1 1.1'' 237° 2017 UMa 11h04m57.29s +38°24'38.20"

../images/binary-star-orbits/HO378-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) In a pretty cluster in the finder (~ 12 stars loose and poor, wide magnitude range, triangle shape). Pair is a fine split 1 delta mag 1", ice blue A and slightly yellow B.
STF1510 7m7 9m0 5.7'' 328° 2019 UMa 11h08m00.06s +52°49'17.90"

../images/binary-star-orbits/STF1510-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (64x) bei 32x wirkt der Stern leicht länglich - bei 64x dann gelingt die Trennung - Komponente B hängt nordwestlich über A und ist mehr als eine Größenklasse schwächer - ein schönes enges Paar bei dieser Vergrößerung - B wirkt trotz des Größenunterschiedes nicht so schmutzig grau, wie es sonst immer ist
STF1517 & BU1431 STF1517 AB 7m5 8m0 0.7'' 314° 2017 Leo 11h13m40.99s +20°07'43.30"
BU1431 AB-C 7m5 10m8 246.1'' 97° 2015

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

Robert Zebahl
Leipzig (Germany)
102mm (187x) STF1517 (AB): 2020-03-28: At 187x the double star immediately appears elongated, but without notching. On closer observation, the slight difference in brightness could be detected. Not better at higher magnifications. Observation at quite good seeing (4/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) STF1517 (AB): länglich ../projects/double-stars/uwe-pilz/sketches/200327stf1517.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) STF1517 (AB): 2020-03-27: Clearly elongated. In some moments the double star appeared notched with a small difference in brightness. Observation at moderate seeing (3/5).
Mark McCarthy
Fremont (California/USA)
317mm (340x) STF1517 (AB): Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (533x) STF1517 (AB): Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal
★★ STF1523, xi UMa, 53 UMa, Alula Australis AB 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
STF1527 7m0 8m0 0.4'' 279° 2017 Leo 11h18m59.91s +14°16'06.90"

../images/binary-star-orbits/STF1527-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) At 205x I know something is up with this star. At 333x it is overlapping disks and notched. At 533x it is still only notched but a bit larger and hazier
STF1534 8m1 11m1 5.1'' 315° 2017 Leo 11h21m49.34s +18°11'24.00"

../images/binary-star-orbits/STF1534-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Orange-yellow A, very faint B brightens with averted vision, but can hold direct. Wide, ~3 delta mag
STF1536, iota Leo, 78 Leo AB 4m1 6m7 2.2'' 96° 2018 Leo 11h23m55.37s +10°31'46.90"
AB-C 4m1 11m1 332.1'' 346° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: 2020-03-28: The companion was well visible as brightening on the diffraction ring of the primary component. Sketch see observation with my 102mm refractor.
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: 2020-03-28: At 125x clearly separated. A very beautiful sight! The companion was visible as almost round brightening close to the first diffraction ring of the primary component. The diffraction ring itself appeared very fine. At 224x also a very nice sight with a clear diffraction ring and the companion, which now appeared roundish. ../projects/double-stars/robert-zebahl/sketches/2020-03-28_iota_leo_stf1536.jpg
Mark McCarthy
Fremont (California/USA)
317mm (340x) AB: Quite close, very bright yellow white A and brownish B, split in A's diffraction ring.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Iota Leo. Light orange A and a richer orange B, ~2 delta mag, ~2" separation
★★ STF1540, 83 Leo AB 6m5 7m5 28.4'' 150° 2018 Leo 11h26m45.32s +03°00'47.20"
Stefan Loibl
Rosenheim (Germany)
10x50 clearly split, little difference in magnitude
René Merting
Drachhausen (Germany)
18x70 ein ordentlich getrenntes und dennoch schön eng stehendes Pärchen - Komponente A ist leicht gelblich, Komponente B im SO ist eine dreiviertel Magnitude schwächer und grauweiß
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, in same field as Tau.
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A and reddish B wide separation.
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x steht das Paar zwar weit auseinander, es wirkt aber trotzdem gut zusammengehörend - Komponente B im SO ist eine dreiviertel Magnitude schwächer
STT234 7m5 8m1 0.4'' 181° 2017 UMa 11h30m49.91s +41°17'12.70"

../images/binary-star-orbits/STT234-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Surprisingly tough. Had indications of elongation at powers starting from 533x, but needed 1067x to get the clear bump, but even then it wasn't cleanly split
STF1547, 88 Leo AB 6m3 9m1 15.5'' 332° 2018 Leo 11h31m44.94s +14°21'52.20"

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

Robert Zebahl
Leipzig (Germany)
55mm (42x) Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x erscheint Komponente B nordwestlich von A etwas mehr als knapp getrennt ganz schwach, bestimmt 3 Größenklassen Helligkeitsunterschied - Komponente A warmweiß, B ist grau
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Der Doppelstern ist getrennt.Bläulich-weiß - orange-leicht rötlich. Etwas schwächerer Begleiter.
Mark McCarthy
Fremont (California/USA)
317mm (340x) Bright yellow A, 3x fainter red B. Wide separation.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 88 Leonis: A favorite! Yellow and blue pair, wide
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x ein schönes enges Sternpaar, ordentlich getrennt - Komponente A strahlt hellgelb, B ist deutlich schwächer und empfiehlt sich mit einem Kupferton - ein schöner Farbkontrast
★★ STT235 AB 5m7 7m5 0.9'' 43° 2017 UMa 11h32m20.76s +61°04'57.90"

../images/binary-star-orbits/STT235-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Yellow and orange, 1.5 delta mag, split when seeing shows perfect disks. The stars both show albedo effects, look like suns / globes with shadowing.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Short period. Pretty yellow A, orange B, ~1" ~2 delta mag
STF1555 & HJ503 STF1555 AB 6m4 6m8 0.8'' 149° 2016 Leo 11h36m17.94s +27°46'52.70"
HJ503 AB-C 5m8 11m2 22.5'' 156° 2016

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1555 (AB): blickweise gerade eben trennbar ../projects/double-stars/frederik-wanink/sketches/STF1555.jpg
Mark McCarthy
Fremont (California/USA)
317mm (443x) STF1555 (AB): Nice! AB tight hair-split white pair, with fainter & wide separated AB-C in a row to the east.
Mark McCarthy
Fremont (California/USA)
317mm (443x) HJ503 (AB-C): Nice! STF 1555AB tight hair-split white pair, with fainter & wide separated C in a row to the east.
Mark McCarthy
Fremont (California/USA)
508mm (553x) STF1555 (AB): Hairline split at 333x, clear split with 533x, very close ~0.5", bright. Part of plus one
STF1553 7m7 8m2 6.2'' 165° 2018 UMa 11h36m35.69s +56°08'07.30"

../images/binary-star-orbits/STF1553-orbit-solution-1.jpg ../images/binary-star-orbits/STF1553-orbit-solution-2.jpg

René Merting
Drachhausen (Germany)
320mm (45x) bei 45x sehe ich zwei fast gleich helle Sterne ganz eng beieinander stehen, da passt sprichwörtlich kein Blatt Papier dazwischen - bei 72x Helligkeitsunterschied eine knappe halbe Magnitude - ein ganz feiner Farbunterschied, Komponente A leicht weißgelblich, B im Osten wirkt ein bisschen grau
STF1561 AB 6m5 8m2 8.9'' 247° 2017 UMa 11h38m44.90s +45°06'30.30"
AC 6m5 9m5 176.8'' 90° 2015
AD 6m5 7m6 718.2'' 76° 2015
AE 6m5 12m1 60.7'' 338° 2015

../images/binary-star-orbits/STF1561-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: 2020-04-07: At 22x separated. The fainter companion is still very close to the primary component. At 44x beautiful sight with a clear difference in brightness. A: slightly yellowish, B: pale bluish.
BU603 AB 6m0 8m5 1.0'' 329° 2018 Leo 11h48m38.71s +14°17'03.20"

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

Uwe Pilz
Leipzig (Germany)
105mm (288x) nicht getrennt
Mark McCarthy
Fremont (California/USA)
203mm (533x) Suspected at 205x and 333x but needed higher magnification to see it. B is a very small point, with seeing, in the first diffraction ring. ~1" and ~3 delta mag
STF1608 AB 8m1 8m3 13.6'' 221° 2017 UMa 12h11m27.76s +53°25'17.50"

../images/binary-star-orbits/STF1608-AB-orbit.jpg

René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein schönes helles Pärchen, beide Komponenten sind gleich hell und zahncremeweiß
STF1639 AB 6m7 7m8 1.8'' 323° 2018 Com 12h24m26.81s +25°34'56.70"
AC 6m7 11m4 91.4'' 159° 2015

../images/binary-star-orbits/STF1639-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: 2020-04-04: The double star is clearly elongated, with the fainter companion attached to the primary component.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: White and slightly blue pair, close, around 3"
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: White and slightly blue pair, close, around 3"?
Mark McCarthy
Fremont (California/USA)
317mm (443x) AB: Close but well split, 1.5 delta mag, ~2.5"
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Pretty yellow stars, ~2" separation, ~2 delta mag
STF1643 AB 9m0 9m4 2.7'' 2018 Com 12h27m13.72s +27°01'29.60"

../images/binary-star-orbits/STF1643-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Equal orange pair, ~3", PA to north.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Yellow-white stars, ~3" separation, ~2 delta mag
STT251 8m3 9m3 0.7'' 55° 2018 CVn 12h29m07.72s +31°23'25.40"

../images/binary-star-orbits/STT251-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Decidedly not round disk -- there's also a brightening in the diffraction. Marginal.
★★ WRH12, 23 Com 5m0 6m9 0.3'' 12° 2016 Com 12h34m51.12s +22°37'45.10"

../images/binary-star-orbits/WRH12-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 23 Com. I get a definite snowman and can tell the larger from the smaller star, pointed in a certain direction in relation to a faint field star. Short Period double
STF1663 8m0 9m2 0.5'' 65° 2017 Com 12h37m10.81s +21°11'52.50"

../images/binary-star-orbits/STF1663-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Hairline split, ~1 delta mag, tough. Light yellow-orange A
★★★ 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
Winfried Kräling
Marburg (Germany)
127mm (146x) 21.04.2018: Bei V=100x erscheint dieser orangefarbene Doppelstern bereits als „8“. Bei V=146x ist Porrima voll getrennt. ../projects/double-stars/winfried-kraeling/sketches/180421_03_Gamma%20Vir.jpg
Sarah Gebauer
Germany
150mm (166x) die 2,8'' entfernten Komponenten A und B konnten haarscharf bei 83x und 166x getrennt werden, beide strahlen gleich hell als ganz dichte Glanzpünktchen; Komponenten E und F wurden gesehen, C und D allerdings nicht; bei 83x waren AB ganz knapp nicht mehr voneinander getrennt ../projects/double-stars/sarah-gebauer/sketches/20200416%20Gamma%20Vir%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (170x) Porrima. Very pretty yellow-white, near equal, close split at 170x. Star disks improved with apodizing mask.
STF1687, 35 Com AB 5m2 7m1 1.2'' 199° 2018 Com 12h53m17.77s +21°14'42.10"
AC 5m2 9m8 28.5'' 127° 2016

../images/binary-star-orbits/STF1687-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) AC: Rich light yellow and much fainter wide blue B. Near M64. [Need to re-observe. I saw the wide AC, but not the AB which is 5.15/7.08 1.2"
Mark McCarthy
Fremont (California/USA)
317mm (205x) AC: Rich light yellow and much fainter wide blue B. Near M64. (Need to re-observe. I saw the wide AC, but not the AB which is 5.15/7.08 1.2")
Mark McCarthy
Fremont (California/USA)
317mm (443x) AC: Orange and blue, 3 delta mag, very wide separation to the east. Did not notice AB
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 35 Com: Bright orange & fainter B, showpiece, ~1.5"
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB: 35 Com. Can see the 7th magnitude B at 333x, but it's easier to resolve with 533x. Part of plus one. Bright orange A and deeper orange B
STT256 7m3 7m6 1.1'' 101° 2017 Vir 12h56m26.59s -00°57'16.60"

../images/binary-star-orbits/STT256-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide separation equal brightness white stars
78 UMa, BU1082 5m0 7m9 0.8'' 127° 2017 UMa 13h00m43.59s +56°21'58.80"

../images/binary-star-orbits/BU1082-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) nicht getrennt
STT261 7m4 7m6 2.6'' 339° 2017 CVn 13h12m02.02s +32°05'07.90"

../images/binary-star-orbits/STT261-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) Light yellow-white equal pair, ~1.5"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Light yellow-white equal pair, ~1.5".
RST3829 & SHJ162 RST3829 Aa-Ab 7m3 9m1 0.5'' 166° 2018 Vir 13h14m55.72s -11°22'09.90"
SHJ162 AB 7m1 8m2 113.2'' 45° 2017
SHJ162 BC 8m2 13m3 66.2'' 136° 2015

../images/binary-star-orbits/RST3829-Aa-Ab-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (32x) SHJ162 (AB): bei 32x weit auseinander stehend - ein eigentümlicher Farbkontrast, A strahlt weiß, B kupfern
Mark McCarthy
Fremont (California/USA)
317mm (340x) SHJ162 (AB): a widely separated yellow A and orange B, 1 magnitude difference.
BU800 AB 6m7 9m5 7.6'' 104° 2018 Com 13h16m51.05s +17°01'01.90"

../images/binary-star-orbits/BU800-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) Lovely yellow and orange, very pretty. Wide separation, 2.5 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Lovely yellow and orange, very pretty, wide separation, 2.5 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice pair, A is a light but rich yellow, B is blue-white. Wide, ~2 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (553x) Not difficult, orange-yellow A with bluish B, 3 delta mag. pretty wide to east.
★★ HU644 AB 9m1 9m9 0.1'' 354° 2019 CVn 13h19m45.58s +47°46'41.10"

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

Mark McCarthy
Fremont (California/USA)
317mm (443x) Orange-red pair, near equal mag, split with seeing at 443x
STF1734 6m8 7m3 1.1'' 173° 2017 Vir 13h20m41.57s +02°56'31.90"

../images/binary-star-orbits/STF1734-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (104x) Double star appeared slightly elongated without noticeable notching.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Blue-white A, light orange B, half delta mag, close ~1.5". Nice!
STT266 8m0 8m4 2.0'' 358° 2018 Com 13h28m26.68s +15°42'30.50"

../images/binary-star-orbits/STT266-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) ~0.5 delta mag, ~2 separation, nice looking pair
Mark McCarthy
Fremont (California/USA)
317mm (553x) Close 2" near equal white. Period of 1954.11 years. Near its closest separation now (May 2017), will be ~4" by the year 2822.
STF1752 AB 8m2 9m9 1.0'' 107° 2017 UMa 13h28m49.82s +59°55'41.70"

../images/binary-star-orbits/STF1752-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange star perhaps a little elongated, tough.
VYS6, VW Com 11m4 11m3 2.6'' 55° 2018 Com 13h32m44.59s +16°48'39.00"

../images/binary-star-orbits/VYS6-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) VW Com. Seen best with averted vision and when seeing stills. Close but pretty well split, ~2-3". Extremely faint reddish pair, PA NE.
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"
BU932 AB 6m3 7m3 0.4'' 67° 2018 Vir 13h34m40.48s -13°12'51.50"

../images/binary-star-orbits/BU932-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (170x) Out of round with apodizing mask
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"
STF1781, HT Vir AB 7m9 8m1 1.0'' 195° 2017 Vir 13h46m06.75s +05°06'56.10"

../images/binary-star-orbits/STF1781-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) White A and slightly yellow B, ~2", half delta mag
STF1785 7m4 8m2 2.8'' 190° 2019 Boo 13h49m04.00s +26°58'47.70"

../images/binary-star-orbits/STF1785-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Slightly orange-tinged white stars, near equal, well separated
Karsten Kopp
Köln (Germany)
600mm (180x) Im CLT bei 180 x Vergrößerung gut zu trennen. Leichter Helligkeitsunterschied und beider Sterne erscheinen gelborange.
STF1788 AB 6m7 7m3 3.7'' 101° 2018 Vir 13h54m58.20s -08°03'31.90"

../images/binary-star-orbits/STF1788-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (47x) Very nice view! Pretty tight together with a moderate difference in brightness.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x zeigt sich ein schönes, knapp getrenntes Pärchen - B im Osten ist nur knapp schwächer als A - Komponente A ist weiß, B ist grau, wirkt aber auch leicht gelb gefärbt - zurück auf 64x kann ich die beiden Sterne auch schon knapp getrennt erkennen
Mark McCarthy
Fremont (California/USA)
317mm (340x) bright pair of near equal magnitude, both yellow-while color.
A1097 & STF1800 A1097 AB 9m1 8m2 0.4'' 259° 2016 UMa 14h02m00.60s +57°13'28.60"
STF1800 AB-C 7m8 10m4 28.4'' 20° 2015

../images/binary-star-orbits/A1097-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) A1097 (AB): Hair-split at best moments, half delta mag, <0.8". A fainter star likely in the system about 30" distant -- this is STF 1800 AB-C.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1800 (AB-C): Faint star ~30" from A1097
STF1820 9m1 9m4 2.8'' 123° 2019 UMa 14h13m00.76s +55°19'31.10"

../images/binary-star-orbits/STF1820-orbit.jpg

René Merting
Drachhausen (Germany)
320mm (144x) bei 72x ist ein Stäbchen mit einer angedeuteten Einschnürung erkennen - bei 144x sind beide Komponenten getrennt voneinander sichtbar - beide sind gleich hell
BU224 8m9 9m3 0.6'' 101° 2016 Boo 14h13m26.94s +12°34'26.20"

../images/binary-star-orbits/BU224-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Hairline split with seeing, light yellow-white stars, noticeable mag difference. Snowman when seeing is not stable
STF1821, kap Boo AB 4m5 6m6 13.7'' 236° 2017 Boo 14h13m29.00s +51°47'23.80"

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

René Merting
Drachhausen (Germany)
18x70 Komponente A strahlt so hell, dass B deutlich schwächer ganz knapp im SW von A abgesetzt sichtbar ist - Helligkeitsunterschied schätzungsweise 3 Magnituden (nur 2.09 mag laut Stelle Doppie)
Uwe Pilz
Leipzig (Germany)
105mm (144x) weiß-grau, trennbar bei 22x
Karsten Kopp
Köln (Germany)
600mm (180x) Im CLT leicht zu trennen. Beider Sterne erscheinen weißlich.
STF1816 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
★★ A1101 AB 9m7 10m3 0.3'' 224° 2018 Boo 14h15m50.57s +10°17'59.30"

../images/binary-star-orbits/A1101-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) I stared for a long time and had brief instants of an elongation or bump, and even a tentative split of a star. Sketched the orientation will check the PA later [I think I have it. My orientation on the sketch is in the correct position as in relation to the AB-C & AB-D pairs.]
STF1825 6m5 8m4 4.2'' 154° 2019 Boo 14h16m32.84s +20°07'18.70"

../images/binary-star-orbits/STF1825-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Cream white A and light blue B, wide ~5", ~2 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (277x) White and orange, 3 delta mag, well split.
STF1834 8m1 8m3 1.6'' 104° 2018 Boo 14h20m17.60s +48°30'25.10"

../images/binary-star-orbits/STF1834-orbit.jpg

Robert Zebahl
Leipzig (Germany)
120mm (150x) At 108x elongated, at 150x barely split with similarly bright components.
★★ STF1835 & BU1111 STF1835 A-BC 5m0 6m8 6.2'' 196° 2018 Boo 14h23m22.74s +08°26'47.90"
BU1111 BC 7m4 7m7 0.3'' 16° 2018

../images/binary-star-orbits/BU1111-BC-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (64x) STF1835 (A-BC): bei 32x erscheint der Stern leicht unrund, verschmiert - bei 107x präsentiert sich BC gut getrennt im Süden von A - Helligkeitsunterschied eine Größenklasse (1.75 mag laut Stelle Doppie) - bei 64x sind beide Sterne auch getrennt erkennbar, BC strahlt warmweiß
Robert Zebahl
Leipzig (Germany)
102mm (62x) STF1835 (A-BC): At 28x barely split with visible difference in brightness. At 62x easy to separate. The colors seemed similar.
Mark McCarthy
Fremont (California/USA)
203mm (333x) STF1835 (A-BC): Yellow A and slightly yellow B, wide. Did not notice BU1111 BC, 0.3" 7.4/7.7
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1835 (A-BC): In a line of three stars, white and slightly red B. Wide, ~6", 2 delta mag. Did not detect BC 0.3"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) BU1111 (BC): Short period pair, it is a component of STF 1835. I get a nothed near equal elongation with a clear direction in relation to the A star. Very cool
Karsten Kopp
Köln (Germany)
600mm (180x) STF1835 (A-BC): Doppelstern konnte im CLT gut getrennt werden. Helligkeitsunterschied ist merklich, aber nicht extrem. Der hellere erscheint eher weißlich und der kleinere eher bläulich. Der Farbunterschied ist aber minimal.
Berthold Fuchs
Wiesbaden (Germany)
130mm STF1835 (A-BC): close DS ../projects/double-stars/berthold-fuchs/photographs/STF%201835.jpg
STF1858 AB 8m1 9m0 3.0'' 38° 2019 Boo 14h33m36.45s +35°35'08.00"
AC 8m1 14m3 19.7'' 335° 2013
AD 8m1 14m7 36.6'' 322° 2013

../images/binary-star-orbits/STF1858-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 64x ein extrem dicht stehendes Pärchen, Trennung fast greifbar - bei 142x stehen die Sterne noch immer sehr eng, die Trennung ist nun aber eindeutig - Komponente B im NO ist etwas schwächer - beide Sterne leicht gelblich, hin und wieder mit Farbkontrast in Richtung orange
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: nicht getrennt
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Near equal orange 3-4"
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: 13th magnitude, a wide pair? Seen with averted vision, comes and goes with seeing
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
STF1867 8m4 8m8 0.7'' 355° 2017 Boo 14h40m44.21s +31°17'23.50"

../images/binary-star-orbits/STF1867-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) 0.5 delta mag, hair to figure 8 split, white.
STF1872 AB 7m5 8m3 7.4'' 50° 2019 Dra 14h41m00.84s +57°57'28.10"

../images/binary-star-orbits/STF1872-AB-orbit.jpg

René Merting
Drachhausen (Germany)
320mm (45x) bei 45x ist die B-Komponente nordöstlich über A erkennbar, ein Blatt Papier passt zwischen die beiden - leichter Farbunterschied - bei 72x zeigt sich ein gut getrenntes Pärchen, B ist eine dreiviertel Magnitude schwächer und blauweiß, A ist gelbweiß
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen. Helligkeitsunterschied ist erkennbar, aber nicht besonders auffällig. Der hellere Stern erscheint weißgelblich und der schwächere gelblich.
★★ 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
★★ HU575 AB 9m8 10m1 0.5'' 152° 2011 Boo 14h42m33.63s +19°28'46.90"

../images/binary-star-orbits/HU575-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Short period. Small, faint, but definite split of these orange-red near equal stars. I sketched a clear orientation to field stars. Awesome
A1109 AB 7m4 9m4 1.9'' 88° 2017 Vir 14h42m47.60s +06°35'26.40"

../images/binary-star-orbits/A1109-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Both stars light yellow, big magnitude difference, ~3-4 delta mag, about 2". Not difficult
STF1879 AB 7m8 8m4 1.7'' 82° 2018 Boo 14h46m15.58s +09°38'48.20"

../images/binary-star-orbits/STF1879-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Fairly close yellow and orange-yellow, ~1 delta mag, ~3"
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gerade so getrennt werden. Beide erscheinen weißlich.
STF1884 6m6 7m5 2.1'' 58° 2019 Boo 14h48m23.37s +24°22'01.00"

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

René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist der Doppelstern als 8 erkennbar, 107x reicht dann für die knappe Trennung - die B-Komponente im NO ist nur unwesentlich schwächer - ein sehenswertes Pärchen
Robert Zebahl
Leipzig (Germany)
102mm (86x) At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) 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"
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gerade so getrennt werden. Beide Sternen leuchten weißlich.
BU346 7m5 7m9 2.7'' 277° 2017 Lib 14h48m31.71s -17°20'24.40"

../images/binary-star-orbits/BU346-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Easy, well split, yellow-orange stars, half delta mag.
STF1883 7m0 8m9 1.0'' 278° 2015 Vir 14h48m53.22s +05°57'15.90"

../images/binary-star-orbits/STF1883-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Strongly suspect a split / elongation in 80mm finder. In the scope it is a tight 2 delta mag orangish-white pair, ~1"
BU106, mu Lib, 7 Lib AB 5m6 6m6 2.0'' 2016 Lib 14h49m19.09s -14°08'56.30"
AC 5m6 14m7 12.9'' 294° 2000
AD 5m6 14m1 25.7'' 168° 2000
AE 5m6 12m6 26.6'' 232° 2015

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Close, 1.5-2", half to one delta mag, off-white stars
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Close, 1.5-2", half to one delta mag, off-white stars.
Gerd Kohler
Langenzenn (Germany)
254mm (346x) AB: Bläulich-weiß - bläulich-weiß. A und B haben nur einen geringen Helligkeitsunterschied.
Gerd Kohler
Langenzenn (Germany)
254mm (346x) AE: Bläulich-weiß - weiß. Stern E ist sehr schwach.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt, schwierig wegen Südlage ../projects/double-stars/frederik-wanink/sketches/MuLib.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: 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) 2020-04-01: At 44x elongated, partly notched. At 67x split, but very tight. A difference in brightness was not seen. At 133x clearly separated with little difference in brightness. A appeared pale yellow, B rather warm-white.
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-18: At 57x very finely separated with extremely tightly spaced components that appeared equally bright. At 100x a very nice pair with little difference in brightness. Fantastic sight! The color of the components was slightly different: creamy-white & a touch of yellow-orange.
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
Karsten Kopp
Köln (Germany)
600mm (180x) Ein recht schöner Doppelstern, wobei neben dem Helligkeitsunterschied von 2,2 mag auch die Sternfarben ein schönes Gesamtbild geben. Der hellere Stern erstrahlt gelblich weiß und der schwächere orangegelb.
Hier handelt es sich auch um ein recht nahes System mit 21,9 Lichtjahren Entfernung.
../projects/double-stars/karsten-kopp/sketches/STF1888.jpg
STT287 8m4 8m6 0.5'' 2018 Boo 14h51m27.53s +44°55'42.60"

../images/binary-star-orbits/STT287-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow! Hair-split, ~0.7", near equal to half a delta mag.
BU31 AB 8m5 10m3 2.0'' 222° 2017 Boo 14h52m30.05s +18°44'19.50"

../images/binary-star-orbits/BU31-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) White A and light yellow B, finely split, ~2 delta mag
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gerade so getrennt werden. Die Distanz von 2,0 Bogensekunden und die Helligkeit beider Sterne, macht die Sichtung nicht leicht.
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)
BU119 AB 8m1 8m8 2.3'' 275° 2017 Lib 15h05m31.91s -07°00'48.80"

../images/binary-star-orbits/BU119-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Tried 667x at first but it was too much power, too dim and seeing too choppy. 333x was perfect, clean and well split ~2" near equal, slightly orange
Mark McCarthy
Fremont (California/USA)
203mm (333x) 8" 667x Too much power, too dim and seeing too choppy. 8" 333x perfect, clean and well split ~2" near equal, slightly orange.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very like BU 346. well split near half delta mag yellow stars, 2.5”
STFA27, 49 Boo AB 3m6 7m9 105.0'' 78° 2017 Boo 15h15m30.16s +33°18'53.40"
René Merting
Drachhausen (Germany)
18x70 ein sehr ungleiches, weit auseinander stehendes Sternpaar - Komponente A im Westen strahlt gleißend cremegelb, die wesentlich schwächere Komponente B im Osten ist weißgrau bis bräunlich
Mark McCarthy
Fremont (California/USA)
80mm (13x) Split in 80mm finder. Very wide pair, very bright A, 3 delta mag B. Orange-yellow and blue-white B
Mark McCarthy
Fremont (California/USA)
203mm (205x) Bright star with many nearby faint stars. Didn't bother trying to figure out which are which.
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!
★★ mu Boo, 51 Boo, Alkalurops CHR181, mu 1 Boo Aa-Ab 4m3 0.1'' 188° 2012 Boo 15h24m29.54s +37°22'37.10"
STFA28, mu 1 Boo AB 4m3 7m1 109.0'' 172° 2018
STF1938, mu 2 Boo Ba-Bb 7m1 7m6 2.3'' 2019

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

Robert Zebahl
Leipzig (Germany)
8x40 STFA28 (AB): Easily split with obvious difference in brightness.
René Merting
Drachhausen (Germany)
16x70 STFA28 (AB): weit getrenntes Pärchen, aufgrund der großen Helligkeitsunterschiedes schöner Farbkontrast - Komponente A im Norden gelblich, B im Süden mehr grau-braun
Robert Zebahl
Leipzig (Germany)
70mm (22x) STFA28 (AB): Evident, very wide apart and unequal. A: white-yellowish, B: grey.
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) CHR181 (Aa-Ab): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy
Fremont (California/USA)
203mm (205x) STF1938 (Ba-Bb): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1938 (Ba-Bb): 3er System, schön ../projects/double-stars/frederik-wanink/sketches/STF1938.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) 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
Karsten Kopp
Köln (Germany)
600mm (257x) Hier handelt es sich um ein Dreifachsternsystem, welches jetzt aber nicht durch eine besondere Färbung der Sterne auffällt. Die A - B/C Komponenten stehen noch sehr weit auseinander, wobei auch die A-Komponente um einiges heller erscheint. Die beiden Komponenten B/C sind wesentlich näher beieinander und unterscheiden sich auch kaum in ihrer Helligkeit. ../projects/double-stars/karsten-kopp/sketches/mu%20Boo.jpg
HU149 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
★★ STT296 AB 7m8 9m1 2.1'' 274° 2019 Boo 15h26m26.56s +44°00'13.20"
AC 7m8 12m7 80.7'' 313° 2016

../images/binary-star-orbits/STT296-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very fine but well split, ~2", yellow-white A, reddish B, 2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very fine but well split, ~2", yellow-white A, reddish B, 2 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Very beautiful, 2", 2 delta mag, with very faint third (AC) seen with averted vision widely separated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Very beautiful, 2", 2 delta mag, with very faint third (AC) seen with averted vision widely separated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Close near equal, 1 delta mag, white.
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.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 142x zwei gut getrennte reinweiße Komponenten - B wirkt eine halbe Größenklasse schwächer - zurück auf 107x ist die Trennung ebenfalls einfach - zurück auf 64x ist es eine 8 mit tiefen Einschnürungen, kurz vor der Trennung
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: sparse field
Sarah Gebauer
Germany
150mm (85x) AB: Mit 85x schon schön getrennt, ein leichter Größenunterschied der Sterne zu erkennen, einige schwache Feldsterne im Okular bei 0,95° Gf. ../projects/double-stars/sarah-gebauer/sketches/20200422%20Delta%20Ser%20DSk.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt, Del Ser ../projects/double-stars/frederik-wanink/sketches/STF1954.jpg
STT298 AB 7m2 8m4 1.3'' 187° 2017 Boo 15h36m02.22s +39°48'08.90"
AB-C 6m9 7m8 120.4'' 328° 2017
AB-D 6m9 13m9 167.4'' 224° 2002
AB-E 6m9 12m1 456.0'' 335° 2002

../images/binary-star-orbits/STT298-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (28x) AB-C: Wide, moderately unequal pair. Little difference in color: Primary components appeared a bit more orange colored.
Robert Zebahl
Leipzig (Germany)
120mm (23x) AB-C: Easy to split with large angular distance and noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: At zenith, but worth the effort to slew to. Another great 2+1. The tight pair [AB] is near equal and split a little more than a hairline
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: At zenith, but worth the effort to slew to. Another great 2+1. The tight pair (AB) is near equal and split a little more than a hairline split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: One component of compicated 6 star system, some of which is split in 80mm finter. This is a close equal pair, ~2".
★★ STF1964 & HU1167 HU1167 AB 8m1 9m9 1.4'' 80° 2016 CrB 15h38m12.91s +36°14'48.60"
STF1964 AC 8m1 8m1 14.5'' 90° 2017
STF1964 AD 8m1 9m0 15.1'' 84° 2018
STF1964 CD 8m1 9m0 1.5'' 21° 2019

../images/binary-star-orbits/HU1167-AB-orbit.jpg ../images/binary-star-orbits/STF1964-CD-orbit.jpg

René Merting
Drachhausen (Germany)
18x70 STF1964 (AC): zu erkennen sind zwei gleich helle, sehr dicht stehende Sterne - Trennung ein wenig mehr als knapp
René Merting
Drachhausen (Germany)
100mm (20x) STF1964 (AC): bei 20x ein gut getrenntes Pärchen gleich heller Sterne, auffallend im Sternumfeld
Robert Zebahl
Leipzig (Germany)
102mm (62x) STF1964 (AC): Rather wide pair, equal without visible difference in color.
Uwe Pilz
Leipzig (Germany)
105mm (16x) Dreifachstern nicht trennbar
Robert Zebahl
Leipzig (Germany)
120mm (23x) STF1964 (AC): Nice double star, well split with equally bright components.
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1964 (AC): Well split equal pair. I suspect B is pair as it is an elongated orange smear at 277x -- it is STF 1964CD.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1964 (CD): Split, light orange 1 delta mag pair
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1964 (CD): Faint near equal pair about 3" separation. In the same field with HU 1167. Magnificent
Mark McCarthy
Fremont (California/USA)
317mm (553x) HU1167 (AB): Bright star with much fainter pair, about 1" separation, 3-4 delta mag. In same field with STF 1964. Magnificent
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
STF1967, gam CrB 4m0 5m6 0.6'' 111° 2012 CrB 15h42m44.57s +26°17'44.30"

../images/binary-star-orbits/STF1967-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) Definite mis-shape, oval to egg, observation made June 2019
Mark McCarthy
Fremont (California/USA)
203mm (667x) Gamma CrB. Definite mis-shape, oval to egg.
STT303 AB 7m7 8m1 1.6'' 175° 2019 Ser 16h00m54.16s +13°16'18.20"

../images/binary-star-orbits/STT303-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal white, ~1.5". Nice!
S676, rho CrB 5m5 10m5 141.7'' 47° 2012 CrB 16h01m02.65s +33°18'12.60"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Rho CrB. bright orange star with very obvious wide B, 3 delta mag
STF2021, 49 Ser AB 7m4 7m5 4.0'' 358° 2019 Her 16h13m18.45s +13°31'37.20"

../images/binary-star-orbits/STF2021-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) Lovely split. Almost equal pair with relatively close components.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x zeigen sich zwei gleich helle weiße Sterne, die sich gerade noch berühren - bei 64x dann knappe Trennung, B ist nur minimal schwächer
Mark McCarthy
Fremont (California/USA)
317mm (553x) Equal yellow-white stars, ~4".
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen, bei fast identischer Helligkeit. Ein weißliches Augenpaar schaut mich an.
sigma CrB, 17 CrB, STF2032 AB 5m6 6m5 7.2'' 239° 2019 CrB 16h14m40.85s +33°51'31.00"

../images/binary-star-orbits/STF2032-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x clearly separated, but very close with a clear difference in brightness. At 57x easy without any noticeable difference in color.
René Merting
Drachhausen (Germany)
100mm (32x) bei 20x zwei knapp zusammenstehende Sterne mit tiefer Einschnürung - bei 32x dann ein knapp getrenntes Pärchen - B-Komponente südwestlich gut eine halbe Größenklasse schwächer - beide Sterne mit weißem Brautkleid
Stefan Loibl
Rosenheim (Germany)
102mm (26x) Already split at 26x. Component A orange, B yellow.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice wide white, ~1 delta mag.
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein schick anzusehendes, knapp getrenntes Pärchen - A im Osten ist hellgelb - B ist vielleicht eine halbe Größenklasse schwächer und auch gelblich, aber nicht so stark wie A
Mark McCarthy
Fremont (California/USA)
508mm (667x) Sigma CrB. AB nice bright half delta mag wide. two more stars in system, one (AC) closer fainter, other (AD) further away.
Karsten Kopp
Köln (Germany)
600mm (135x) Sehr einfaches, auffälliges Objekt im Okular, ansonsten keine weiteren Auffälligkeiten.
STF2026 AB 9m5 9m9 3.5'' 16° 2019 Her 16h15m57.07s +07°21'24.80"

../images/binary-star-orbits/STF2026-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) bei 64x sind die Sterne so schwach, dass ich hellere Sterne im Umfeld zum Fokussieren nutzen muss - beide Komponenten sind als 8 erkennbar, die Einschnürung ist aber nur in guten Momenten da - bei 107x dann gelingt die Trennung, B wirkt deutlich schwächer (in Wirklichkeit ist B nur 0m4 schwächer), aber vielleicht liegt es daran, dass die beiden Sterne ohnehin nur sehr schwach beobachtbar sind - das hat wenig Freude bereitet
KUI72 5m5 10m0 2.1'' 127° 1997 Her 16h19m55.24s +39°42'30.90"

../images/binary-star-orbits/KUI72-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Distinct faint point appears with perfect seeing ~2-3". Much smaller and fainter than A.
★★★ rho Oph, 5 Oph H2 19 AB 5m1 5m7 3.0'' 334° 2017 Oph 16h25m35.03s -23°26'47.00"
H2 19 AC 5m1 7m3 149.2'' 2000
H2 19 AD 5m1 6m8 156.4'' 252° 2000
KOU63 CF 5m8 11m7 4.8'' 206° 2000
BU1115 DE 6m8 8m4 0.3'' 196° 2018

../images/binary-star-orbits/H2-19-AB-orbit.jpg ../images/binary-star-orbits/BU1115-DE-orbit.jpg

Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: possible components (DE) and (CF) already visible at 27x magnification with ca. 2 arcmin distance
STF2052 AB 7m7 7m9 2.5'' 118° 2018 Her 16h28m52.67s +18°24'50.60"

../images/binary-star-orbits/STF2052-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) bei 64x zwei gleichhelle Sterne, die sich gerade so berühren - bei 107x ein knapp getrenntes Pärchen, Komponente B im SO ist nur marginal schwächer
Stefan Loibl
Rosenheim (Germany)
102mm (102x) Does not appear as a multiple star at 28x, elongated at 68x, splith with 102x. Component A blueish, B reddish. Observation of component C questionable. Occasional observation of a star at the presumably correct position.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Pretty pale yellow-orange pair of equal magnitude, about 2" separation.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal orange, ~3"
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern war noch gut zu trennen, bei fast identischer Helligkeit. Komponente A wirkt weißlich, während die etwas schwächere Komponente B gelblich orange strahlt.
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
Sarah Gebauer
Germany
150mm (160x) habe den Doppelstern zwar gefunden und konnte auch erkennen, dass es zwei Sterne sind, eine Trennung war aber heute Abend nicht möglich
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/Marfic.jpg
STF2059 8m8 8m8 0.3'' 179° 2016 Her 16h30m55.71s +38°03'52.60"

../images/binary-star-orbits/STF2059-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Mark McCarthy
Fremont (California/USA)
317mm (553x) Overlapping disks, notched. Need perfect seeing. This was 1.2" at Struve's discovery, so easier for him to see -- I doubt he would have found it now, near its closest separation. August 2017
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
René Merting
Drachhausen (Germany)
320mm (320x) in der Nacht konnte ich nur bis 320x gewinnbringend vergrößern - Komponente A zeigt schöne Beugungsscheibchen, B offenbarte sich mir nicht
STF2091 8m4 9m3 0.4'' 324° 2010 Her 16h42m09.74s +41°11'42.90"

../images/binary-star-orbits/STF2091-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Mark McCarthy
Fremont (California/USA)
317mm (553x) I "see" rod shape once I know it is 0.4" separation. Marginal. (This one 1.3" at Struve's discovery, so easy for him! August 2017)
D15 9m0 9m3 0.6'' 335° 2016 Her 16h43m56.29s +43°28'31.20"

../images/binary-star-orbits/D15-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange elongated, with notch, near equal. (0.9" at discovery).
★★ 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

René Merting
Drachhausen (Germany)
100mm (142x) BU627 (A-BC): bis 142x probiert, hat nicht funktioniert - der Helligkeitsunterschied ist vermutlich zu groß und das Beugungsscheibchen von A so hell wie BC selbst
Robert Zebahl
Leipzig (Germany)
102mm (280x) BU627 (A-BC): At 160x the faint component is already beginning to be visible as brightening in the first diffraction ring. At 280x the brightening is quite clearly visible and appears partly clear as a small knot in the first diffraction ring.
Uwe Pilz
Leipzig (Germany)
105mm (288x) BU627 (A-BC) ../projects/double-stars/uwe-pilz/sketches/52Her.jpg
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"
★★ STF2107 AB 6m9 8m5 1.5'' 109° 2018 Her 16h51m50.10s +28°39'58.70"

../images/binary-star-orbits/STF2107-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange pair, very close ~1.5", 1 delta mag. Very pretty.
Mark McCarthy
Fremont (California/USA)
508mm (667x) Nice pair yellow and slightly blue two delta mag, about 1.5" (AC is 11.5 and much further separated)
Karsten Kopp
Köln (Germany)
600mm (385x) Doppelstern ist bei 180-facher Vergrößerung gerade so als 8 zu erkennen. Bei 385-facher Vergrößerung in den seltenen Augenblicken des ruhigen Seeings gerade so eben zu trennen. Sehr schwierig auch wegen des Helligkeitsunterschied von 1,6 mag.
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
★★ 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
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 107x zeigen sich zwei knapp getrennte Perlchen, beide gleichhell und weiß schimmernd - ein schickes Paar
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.
Frederik Wanink
Itterbeck (Germany)
254mm (460x) AB: gleich hell ../projects/double-stars/frederik-wanink/sketches/STF2130.jpg
A1145 6m3 7m8 0.7'' 340° 2018 Oph 17h08m13.65s -01°04'46.10"

../images/binary-star-orbits/A1145-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) Marginal observation of a very faint, very close-in star which briefly resolves as a point and not a flare.
eta Oph, 35 Oph BU1118 AB 3m0 3m3 0.5'' 229° 2018 Oph 17h10m22.66s -15°43'30.50"
BU1118 AB-C 2m4 12m3 99.8'' 148° 2012
BU1118 AD 2m4 11m2 101.2'' 281° 2012
DAL52 AE 2m4 11m1 62.7'' 317° 2012

../images/binary-star-orbits/BU1118-AB-orbit.jpg

Stefan Loibl
Rosenheim (Germany)
102mm (205x) B component recognizable in the airy disk, E component not visible
STF2135 AB 7m6 8m9 8.7'' 195° 2018 Her 17h12m06.06s +21°13'44.40"

../images/binary-star-orbits/STF2135-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (32x) bei 64x ein locker getrenntes Pärchen - Komponente B im Süden halb so hell wie A - zurück auf 32x sind beide Sterne als enges Pärchen erkennbar, nicht zu knapp getrennt - noch weiter zurück auf 20x sehe ich ein längliches Sternchen, Trennung bei dieser Vergrößerung noch nicht möglich
Mark McCarthy
Fremont (California/USA)
203mm (667x) Pretty yellow star with widely separated 2 delta mag bluish B. (Not physical)
Mark McCarthy
Fremont (California/USA)
317mm (553x) Dull orange and almost green B, wide, 2 delta mag.
★★ 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.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x ist noch nichts erkennbar - bei 64x wird östlich von Rasalgethi der schwache Begleiter B knapp getrennt sichtbar - A ist strahlend gelb, B mit einer Tendenz zum gelb, eher ein warmes weiß
Uwe Pilz
Leipzig (Germany)
105mm (88x) himmelblau und hellgelb, getrennt bei 53x ../projects/double-stars/uwe-pilz/sketches/191025_alphaHer.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb-lachsfarben
Robert Zebahl
Leipzig (Germany)
120mm (100x) Easily split with noticeable difference in brightness. A: intensively orange colored, B: slightly orange.
Karsten Kopp
Köln (Germany)
140mm (94x) Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer
Germany
150mm (85x) bei Halbmond auf der Schwäbischen Alb: sehr eng, aber sauber getrennt, eine Komponente ist viel heller und größer, mein Farbeindruck ist allerdings unerwartet eher gelb
Sarah Gebauer
Germany
150mm (160x) richtig gold, es strahlt mich richtiggehend an, auch sehr schön getrennt, ein toller Doppelstern! ../projects/double-stars/sarah-gebauer/sketches/20200805%20Alpha%20Her%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
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.
Karsten Kopp
Köln (Germany)
600mm (135x) Leicht zu trennen. Komponente A erscheint orange, Komponente B gelblich.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen. Komponente A erstrahlt orange und Komponente B gelblich. ../projects/double-stars/karsten-kopp/sketches/STF2140.jpg
Jens Leich
Germany
130mm ../projects/double-stars/jens-leich/photographs/Doppelstern_Rasalgethi_Herkules_220719_2159UT_RGB.jpg
SHJ243, 36 Oph AB 5m1 5m1 5.1'' 140° 2017 Oph 17h15m20.78s -26°36'06.10"
AC 5m1 6m5 731.6'' 74° 2000
AD 5m1 7m8 276.9'' 338° 2000
AE 5m1 12m3 38.2'' 313° 2000

../images/binary-star-orbits/SHJ243-AB-orbit.jpg

Stefan Loibl
Rosenheim (Germany)
102mm (68x) Komponente AB separated at 68x magnification, componente C at greater distance of 12.2 arcmin
★★★ BU628 9m5 9m6 0.6'' 262° 2016 Her 17h18m22.22s +32°39'38.50"

../images/binary-star-orbits/BU628-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Wow split clean, amazing. No resolution at 667x but at 1067x two airy disks, sep by half disk, half delta mag. Remarkable
DON832, xi Oph AB 4m4 8m9 4.1'' 27° 2015 Oph 17h21m00.37s -21°06'46.50"

../images/binary-star-orbits/DON832-AB-orbit.jpg

Stefan Loibl
Rosenheim (Germany)
102mm (205x) fainter 9 mag component not visible
★★ STF2241, psi 1 Dra, 31 Dra AB 4m6 5m6 30.1'' 17° 2018 Dra 17h41m56.36s +72°08'55.80"
Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. Easily split. A appears pearl white, B brick red. A very fine pair for 15x. Resolved in stabilised 10x42 but not so pleasantly. Psi1 Dra is a physical double with a period of roughly 10,000 years.
René Merting
Drachhausen (Germany)
16x70 ein auffälliges Pärchen in einem wilden Sterngewimmel vieler heller Sterne, beide Komponenten sind knapp getrennt zu erkennen - Komponente B ist mindestens eine Größenklasse schwächer und strahlt nicht so schön reinweiß wie A
Christopher Hay
Seeheim (Germany)
80mm (30x) Widely split. A light yellow, B light blue.
Uwe Pilz
Leipzig (Germany)
105mm (55x) weiß-orange
HU1285 8m9 9m2 0.5'' 211° 2016 Her 17h43m38.76s +22°36'43.20"

../images/binary-star-orbits/HU1285-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) unsicher, sehr schwierig
STF2205 9m4 9m6 0.9'' 11° 2016 Her 17h45m41.03s +17°43'00.70"

../images/binary-star-orbits/STF2205-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Half delta mag light orange star about 1" separated (in this scope it is quite wide)
★★★ HU1288 8m3 9m4 0.4'' 163° 2016 Her 17h47m09.16s +15°02'13.80"

../images/binary-star-orbits/HU1288-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Awesome! clean split, very clean star images. Split by half disk, half delta mag. very cool great catch! suspected at 667x, ramped up power to 1067x to split.
STT338 AB 7m2 7m4 0.9'' 168° 2018 Her 17h51m58.46s +15°19'34.90"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt
Mark McCarthy
Fremont (California/USA)
317mm (553x) Just split, a pair of bright near equal orange stars.
Mark McCarthy
Fremont (California/USA)
508mm (667x) Yellow-white very clean split stars seem more equal than what the data says
★★ 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.
René Merting
Drachhausen (Germany)
16x70 ein schön eng stehendes Pärchen, die Himmelsrichtungen erschließen sich mir hier leider nicht, aber die Komponenten sind beide ähnlich hell und weiß - schöner Anblick im Fernglas
Christopher Hay
Seeheim (Germany)
50mm (8x) AB: An elongated figure-8 very close to splitting
Christopher Hay
Seeheim (Germany)
80mm (30x) AB: Very clearly split, dominates the 2.5° FOV, with interesting sprinkling of fainter stars throughout the field.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very nice, slightly uneven pair. Components appeared yellowish-white. Beautiful surroundings. On the sketch the components A, B and C are visible. ../projects/double-stars/robert-zebahl/sketches/2019-06-30_40_41_dra.jpg
Uwe Pilz
Leipzig (Germany)
105mm (100x) AB: =40/41 Dra. Auffallend
Christopher Hay
Seeheim (Germany)
140mm (75x) AB: Wide apart, the pair absolutely dominates the field of view, with attractive sprinkling of fainter stars to the west. Very delicate colour contrast that was hard to grasp in 3-inch scope now becomes clear, component B (40 Dra) is bluish, component A (41 Dra) yellowish.
STF2267 8m4 8m8 0.4'' 281° 2018 Her 18h01m41.17s +40°10'41.90"

../images/binary-star-orbits/STF2267-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
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

Uwe Pilz
Leipzig (Germany)
16x70 nicht einfach; der helle ist gelb ../projects/double-stars/uwe-pilz/sketches/200725_70Oph.jpg
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x wirkt der Stern nicht rund, sondern ein wenig nach SO verschmiert - bei 64x dann eindeutig ein knapp getrenntes schön anzusehendes Pärchen - Komponente A hell-gelb, B orange-gelb
Jörg S. Schlimmer
Germany
127mm (136x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%2070%20Oph_filtered_96dpi.jpg
Sarah Gebauer
Germany
150mm (85x) ein ganz leicht goldener Farbeindruck des Sternpaares, die Sterne stehen recht dicht beisammen und sind dennoch schön getrennt ../projects/double-stars/sarah-gebauer/sketches/20200805%2070%20Oph%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (80x) Conditions in the target region: SQM-L 20.1
Well split at 80x. Brighter component appeared white, fainter one slightly orange.
Berthold Fuchs
Wiesbaden (Germany)
130mm difficult DS ../projects/double-stars/berthold-fuchs/photographs/70%20Ophiuchi.png
STT341 AB 7m4 8m8 0.0'' 79° 2018 Her 18h05m49.72s +21°26'45.60"
AB-C 7m2 10m6 28.2'' 171° 2015
AB-D 7m2 10m5 39.5'' 99° 2009
AB-E 7m2 10m2 66.5'' 38° 2018
AB-F 7m2 11m5 111.6'' 357° 2009
AB-G 7m2 7m6 132.5'' 239° 2018

../images/binary-star-orbits/STT341-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (32x) AB-C: bei 32x ist Komponente C weit getrennt südlich von AB als Hauch von einem Stern erkennbar
AB-D: bei 32x ist Komponente D im Osten von AB ist ähnlich schwach erkennbar wie C im Süden - D ist etwas weiter weg als C
AB-E: bei 32x ist Komponente E im NO von AB ähnlich schwach erkennbar wie C im Süden und D im Osten - Entfernung zu A doppelt so weit wie AB-C
AB-F: bei 64x ist F im Norden von AB in vierfacher Entfernung AB-C erkennbar - im Grunde spiralen die vier schwachen Komponenten von Süden kommend von Osten nach Norden aus
AC15, 99 Her AB 5m1 9m0 1.4'' 331° 2018 Her 18h07m01.61s +30°33'42.70"

../images/binary-star-orbits/AC15-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) 99 Her.Very nice. B star resolves just outside first diffraction ring when that ring has faded with good seeing, a very fine faint point. large delta mag. There are many other pairings in this system, including 0.2" for the A star]
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extremely faint B, just on diffraction ring, with seeing, both 553x & 885x. ~1"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 99 Her: ! Bright yellow star, suspected double at 277x but needed 553x to resolve a 9th mag orange B when seeing stilled, resolved as a point just outside where the diffraction ring was. CDSA notes: "Local, solar type binary, faint field. AB system 1.8 solar mass, p=56 y orbit r = 17 AU, e = 0.77, apastron 2025"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 99 Her. Faint point seen in the diffraction of brighter star disk.
COU812 10m8 10m8 0.7'' 265° 2016 Her 18h09m09.93s +31°29'10.50"

../images/binary-star-orbits/COU812-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) Elongation, marginal notch, but a bit too hazy to make a good observation
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
STT353, phi Dra AB 4m5 5m9 0.5'' 266° 2011 Dra 18h20m45.44s +71°20'15.80"

../images/binary-star-orbits/STT353-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
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.
★★ 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.
Uwe Pilz
Leipzig (Germany)
320mm (388x) ein sehr ruhiger Abend gestattete die Nutzung von 12 Zoll ../projects/double-stars/uwe-pilz/sketches/200808stt359.jpg
★★ STT358 AB 6m9 7m1 1.7'' 149° 2018 Her 18h35m53.22s +16°58'32.50"

../images/binary-star-orbits/STT358-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (110x) fast gleich hell, deutlich trennbar
Mark McCarthy
Fremont (California/USA)
203mm (333x) Pretty, near equal white, perfect disks.
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
STF2367 AB 7m7 8m0 0.4'' 75° 2018 Lyr 18h41m16.36s +30°17'40.90"
AB-C 7m0 8m8 14.1'' 192° 2019
AB-D 7m0 12m0 21.9'' 84° 2007
AB-E 7m0 11m0 151.7'' 341° 2002

../images/binary-star-orbits/STF2367-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (32x) AB-C: bei 32x einfach zu trennen - A-Komponente leicht gelblich, Komponente C südlich ist deutlich schwächer und strahlt zinnober
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: nicht als DS gesehen
★★★ 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)
naked eye While waiting for Comet Neowise at 3 in the morning in July 2020 surprised myself with my first naked-eye separation of Alpha1 und Alpha2 Capricornis (observing site at 50° northern latitude, Alpha1/2 passing through meridian). Encouraged by this, I lay down and had a close look at Epsilon Lyrae, without really expecting to be able to split it naked-eye, having never succeeded previously. At first Epsilon Lyrae appeared as a very short dash of light. Then the dash resolved into two pinpoints. After 15 years in the hobby and at age 60, at last got Eps Lyr split! No precise prior PA knowledge. After memorising PA as seen naked-eye carefully, confirmed it with binoculars. Eps Lyr is the third-easiest physical double in the (northern hemisphere) summer sky for the naked eye, after Zeta UMa (much easier) und Alpha Lib (marginally easier).
Christopher Hay
Seeheim (Germany)
2x54 AB-CD: Clean split. Actually more pleasant than in 4x10 binoculars, presumably due to more steady handheld view.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2382 (AB): At 42x slightly elongated, at 59x elongated and obviously notched.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2383 (CD): At 42x clearly elongated, but without any visible notch. At 59x split with touching diffraction disks.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2382 (AB): Obviously seen as figure '8'.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2383 (CD): Split, but extremely tight with almost touching diffraction disks.
René Merting
Drachhausen (Germany)
76mm (95x) AB-CD: bei 29x schön getrennt erkennbar, ohne dass sich AB und CD schon trennen lassen
AB: bei 57x leicht länglich mit kleiner Einschnürung - bei 95x schön eng getrennt, B nördlich wirkt etwas schwächer- bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
CD: bei 57x eine 8 - bei 95x ein schön eng getrenntes Pärchen gleichheller Sterne - bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
EF und I: bei 127x sind alle drei Sterne (I 10.1 mag / E 12.3 mag / F 12.7 mag) erkennbar
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x ist das Sternpaar mit leichter Einschnürung und Nord-Süd-Ausdehnung erkennbar - beide Sterne stehen minimal enger zusammen als das südlichere Paar CD - bei 107x knappe Trennung, Komponente B nördlich ist mindestens eine halbe Größenklasse schwächer als A
CD: bei 64x als 8 mit Ost-West-Ausdehnung erkennbar - bei 107x knapp getrennt, beide Komponenten sind etwa gleich hell
Robert Zebahl
Leipzig (Germany)
102mm (125x) Stunning view of the components A-D and I! ../projects/double-stars/robert-zebahl/sketches/2019-06-26_epsilon_lyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (26x) bei 22x nicht trennbar ../projects/double-stars/uwe-pilz/sketches/epsLyr2.jpg
Jörg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Epsilon-Lyrae_ausschnitt_filtered.jpg
Sarah Gebauer
Germany
150mm (250x) August 2019 zum ersten Mal die nah beieinanderstehenden Komponenten sauber getrennt, ein grandioser Doppel-Doppel-Anblick
René Merting
Drachhausen (Germany)
320mm (144x) bei 144x sind die Komponenten von AB und CD gerade so getrennt voneinander erkennbar, sie tanzen wie wild miteinander - mit Arperturmaske und Abblendung auf 120 mm zeigen die vier nun deutlich schwächeren Sterne schöne Beugungsscheibchen und sind besser getrennt voneinander sichtbar
Uwe Pilz
Leipzig (Germany)
320mm (200x) 7 Komponenten!! A-B-C-D-E-F-I ../projects/double-stars/uwe-pilz/sketches/epsLyr.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm Double-Double ../projects/double-stars/berthold-fuchs/photographs/epsilon%20Lyrae.png
STF2402 8m9 9m3 1.5'' 208° 2015 Aql 18h49m44.14s +10°40'35.40"

../images/binary-star-orbits/STF2402-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) Lovely near equal, tight but well split. Forms a perfect triangle with two other stars
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")
A258 8m9 9m9 0.3'' 236° 2016 Lyr 18h54m59.91s +30°52'45.50"

../images/binary-star-orbits/A258-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Very tough. I get elongation at 553x, and more clear elongation at 667x, but no split, not even notching, more like an unevenly illuminated rod. Seeing not support higher power.
BU648 AB 5m3 8m0 1.3'' 243° 2015 Lyr 18h57m01.61s +32°54'04.60"

../images/binary-star-orbits/BU648-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Tigher pair (AB) 3 delta mag, at first diffraction, needed critical focus and seeing. Second pair (AB-C) very wide, rather much fainter.
Mark McCarthy
Fremont (California/USA)
317mm (277x) In diffraction but steady disk of B within it, 2" 3 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) 277x an orange not quite round disk, suspected a close pair. At 553x it splits with seeing, 0.8", 3 delta mag, in diffraction.
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
STF2437 8m4 8m8 0.5'' 2017 Sge 19h01m53.16s +19°10'11.70"

../images/binary-star-orbits/STF2437-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Small faint, notched peanut when seeing stills. Orange.
AG227 10m7 11m2 7.1'' 31° 2015 Lyr 19h05m22.05s +38°03'20.60"

../images/binary-star-orbits/AG227-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) This is the brighter pair of the double-double pair mentioned in last entry (ALI 614). White stars, brilliant, wide separation
STF2454 AB 8m3 9m7 1.3'' 291° 2016 Lyr 19h06m09.37s +30°26'18.80"

../images/binary-star-orbits/STF2454-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Fine yellowish pair, ~1.5"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Nice well split 2 delta mag, white A reddish B. (DRD 2 AC is 13.50 mag and 31.3")
HEI568, 18 Aql 5m4 6m4 0.3'' 257° 2015 Aql 19h06m58.60s +11°04'16.70"

../images/binary-star-orbits/HEI568-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (410x) 18 Aql. The A star is elongated / smeared but 410x does not resolve, seeing not good enough.
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
STF2486 AB 6m5 6m7 7.1'' 204° 2019 Cyg 19h12m05.03s +49°51'20.70"

../images/binary-star-orbits/STF2486-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x barely split with a slight difference in brightness. At 44x the primary looked orange. I could not determine the color of the companion.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal yellow pair.
BU139 & STTA177, V338 Sge BU139 AB 7m1 8m0 0.6'' 136° 2017 Sge 19h12m34.45s +16°50'47.20"
STTA177 AC 7m1 8m0 98.4'' 276° 2017
BU139 AE 7m1 11m2 28.8'' 101° 2015
BU139 CD 8m0 11m2 138.9'' 269° 2015

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

Mark McCarthy
Fremont (California/USA)
80mm (13x) STTA177 (AC): Near equal wide pair split in finder
Mark McCarthy
Fremont (California/USA)
203mm (667x) BU139 (AB): 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) BU139 (AB): getrennt, schwierig, 0,6"? ../projects/double-stars/frederik-wanink/sketches/BU139.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU139 (AB): V338 Sge. Overlapping airy disks.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STTA177 (AC): Very wide orange-yellow and blue, ~2-3 delta mag.
STF2484 7m9 9m5 2.1'' 242° 2017 Sge 19h14m15.66s +19°03'50.30"

../images/binary-star-orbits/STF2484-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (142x) bis 142x probiert, keine Chance, Komponente B zeigt sich nicht
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close, ~2", orange, 1.5 delta mag.
STT375 7m7 8m9 0.6'' 189° 2017 Sge 19h34m37.45s +18°07'41.20"

../images/binary-star-orbits/STT375-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Sense an elongation or rod, marginal.
★★ STFA46, 16 Cyg AB 6m0 6m2 39.9'' 134° 2018 Cyg 19h41m49.09s +50°31'31.60"
Christopher Hay
Seeheim (Germany)
3x63 Self-built binoculars, hence the unusual specification. Made of top-quality teleconverters, apochromatic and sharp to the edge.
With naked eye under good suburban sky 16 Cyg is just seen. In the 3x binoculars the double is split into two finest points of light in good moments despite the low magnification. A physical pair according to Stelledoppie.

Two-star rating awarded because this is a true physical pair that can be split with the smallest binoculars and reveals increasingly more with growing binocular size (brightness disctinction between A and B in 7x50, colour distinction in 15x45).
Christopher Hay
Seeheim (Germany)
7x50 Finely split, A-component appears very slightly brighter than B-component. A very pleasing binocular pair.
Christopher Hay
Seeheim (Germany)
15x45 Wide split, very strong visual presence dominating 4.5° FOV. A-component very pale orange, B-component equally pale blue.
René Merting
Drachhausen (Germany)
18x70 zwei ordentlich getrennte fast gleich helle Sterne - beide Komponenten sind reinweiß und die hellsten Sterne im unmittelbaren Umfeld - auffällig
Mark McCarthy
Fremont (California/USA)
317mm (553x) 16 Cyg: Wide equal orange-yellow, also split in 80mm finder
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
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!
STF2580, 17 Cyg AB 5m1 9m2 26.1'' 68° 2015 Cyg 19h46m25.60s +33°43'39.30"

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

René Merting
Drachhausen (Germany)
100mm (20x) bei 20x locker getrennt - Komponente A satt gelb, B wegen des großen Helligkeitsunterschiedes gräulich-bräunlich
Mark McCarthy
Fremont (California/USA)
317mm (277x) 17 Cyg: Yellow and slightly red, well separated, 1 delta mag. (This is an amazingly complex system with 11 stars in all sorts of combinations. Why not just call it an open cluster?)
Mark McCarthy
Fremont (California/USA)
317mm (553x) 17 Cyg: Yellow and blue, wide separation. 11 stars in the system, it should just be called an open cluster
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
STF2596 7m3 8m7 2.1'' 297° 2016 Aql 19h54m01.95s +15°17'31.70"

../images/binary-star-orbits/STF2596-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) bei 107x ist Komponente B knapp abgesetzt nordwestlich von der A-Komponente sichtbar, knappe Trennung - Helligkeitsunterschied gut 1.5 Größenklassen
Mark McCarthy
Fremont (California/USA)
203mm (533x) Orange pair with 2 delta mag companion, about 2", well split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Definite clear split, 2 airy disk widths.
★★ 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.
STF2613 AB 7m5 8m0 3.5'' 354° 2018 Aql 20h01m26.66s +10°44'54.80"

../images/binary-star-orbits/STF2613-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (64x) 64x reicht für die Trennung, dann stehen die beiden Sterne aber noch sehr dicht - beide mit gleicher Helligkeit und strahlend weiß - schick
Mark McCarthy
Fremont (California/USA)
203mm (533x) Easy pair, wide, 1 delta mag light orange color, 4".
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
STF2658 AB 7m2 9m4 5.4'' 106° 2015 Cyg 20h13m40.70s +53°07'00.00"

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

René Merting
Drachhausen (Germany)
100mm (107x) bei 107x ist Komponente B schwach erkennbar östlich von A, es ist schon ordentlich Luft zwischen den beiden - Helligkeitsunterschied 2 Magnituden
Uwe Pilz
Leipzig (Germany)
105mm (144x) orangegelb ../projects/double-stars/uwe-pilz/sketches/190726STF2658.jpg
STF2695 6m6 8m8 0.4'' 259° 2016 Vul 20h31m58.19s +25°48'18.10"

../images/binary-star-orbits/STF2695-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Using 8" mask at 667x, no sign of elongation. With 20" and progressively higher magnifications, I can get to olive shape at 1067x, but extremely marginal. [0.8" at discovery, so easier for Struve]
HEI7, VW Cep 7m7 10m5 0.7'' 231° 2007 Cep 20h37m21.54s +75°36'01.50"

../images/binary-star-orbits/HEI7-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Just glimpsed a speck in the diffraction ring when seeing stills, marginal
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
STF2723 AB 7m0 8m3 1.0'' 140° 2018 Del 20h44m54.58s +12°18'45.60"

../images/binary-star-orbits/STF2723-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (277x) bright, very close near equal magnitude peanut shape
Mark McCarthy
Fremont (California/USA)
317mm (277x) very bright A and a very faint C widely separated.
★★ STF2725 AB 7m5 8m2 6.1'' 12° 2018 Del 20h46m13.31s +15°54'26.40"

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

René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schöner Kontrast zum 15' nördlich stehenden viel helleren Sternpaar STF2727 - hier bei dem wesentlich schwächeren Sternpaar zeigt sich bei 32x die Komponente B knapp getrennt nördlich von A - Helligkeitsunterschied etwas mehr als eine halbe Magnitude, aber Komponente A ist noch deutlich schwächer als die Komponente B von STF2727
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.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x knapp getrennt - Komponente A ist schön gelb, B im Westen ist gut 1.5 Magnituden schwächer (lt. Stelle Doppie Helligkeitsunterschied nur 0.67 mag) - zusammen mit dem wesentlich schwächeren 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.
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.
A613 9m1 9m0 0.8'' 327° 2017 Del 20h51m54.49s +05°44'29.50"

../images/binary-star-orbits/A613-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (533x) Getting the briefest hairline split, but this one is very marginal seeing is a problem
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.
STF2737, epsilon Equ, 1 Equ AB 6m0 6m3 0.2'' 281° 2018 Equ 20h59m04.54s +04°17'37.80"
AD 6m0 13m1 69.3'' 293° 2013
AB-C 5m3 7m0 10.6'' 67° 2018

../images/binary-star-orbits/STF2737-AB-orbit.jpg

René Merting
Drachhausen (Germany)
12x50 AB-C: in ruhigen Momenten präsentieren sich beide Sterne präsentieren sich länglich mit Einschnürung, dann sieht das System aus wie eine kleine Ameise
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB-C: At 22x well separated, but still relatively close together with a clear difference in brightness. At 44x AB looked rather white. The color of C was not apparent.
Christopher Hay
Seeheim (Germany)
80mm (30x) AB-C: Well split, C bluish, AB no definite colour, a nice pair at this power. According to Stelledoppie B and C are a physical pair with a period of 5200 years, and A and B are again a physical pair with a period of 104 years.
René Merting
Drachhausen (Germany)
100mm (32x) AB-C: bei 32x knapp getrennt - Komponente AB mit einem schönen cremegelb, C steht nordöstlich und ist gut 1.5 Größenklassen schwächer
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB-C: Easy yellow stars, very wide, 1 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 1 Equ / Epsilon Equ / Strongly feel an oval AB pairing, marginal.
Berthold Fuchs
Wiesbaden (Germany)
130mm AB-C: close DS ../projects/double-stars/berthold-fuchs/photographs/1%20Equulei.png
59 Cyg, STF2743 MCA65 Aa-Ab 4m8 7m6 0.2'' 2008 Cyg 20h59m49.55s +47°31'15.40"
STF2743 AB 4m7 9m4 21.0'' 353° 2012
STF2743 AC 4m7 11m6 26.5'' 140° 2012
STF2743 AD 4m7 11m2 39.3'' 222° 2012
STF2743 AE 4m7 12m0 70.6'' 59° 2003

../images/binary-star-orbits/MCA65-Aa-Ab-orbit.jpg

Christopher Hay
Seeheim (Germany)
125mm (64x) AB: Widely split and striking in field of view, as the pair is a little outside of the star cloud at the swan's tail that adjoins to the south. The A component appears yellowish. The attraction lies in the B component with delta-mag 4m6, which presents as a fine grey-blue pinprick of light. Alias 59 Cygni.
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 45x ist Komponente B nördlich von A erkennbar - Komponente A strahlend weiß, bei B ist keine Farbe erkennbar, mindestens 4 Größenklassen Helligkeitsunterschied
AD: bei 72x ist Komponente D südwestlich von A in doppeltem Abstand wie AB erkennbar
AE: bei 72x ist Komponente E nordöstlich von A in doppeltem Abstand wie AD und noch schwächer als D erkennbar
BU69 AB 8m3 9m8 0.4'' 2017 Vul 21h02m36.08s +21°41'28.20"

../images/binary-star-orbits/BU69-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) I sense overlapping disks at 553x, but marginal.
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.
★★★ 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.
Sarah Gebauer
Germany
50mm (7x) Zufallsfund im Fernglas aufgrund des deutlichen Farbunterschiedes (orange und blau)
René 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
Jörg S. Schlimmer
Germany
127mm (203x) Intensive Farbe ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_61_Cyg_filtered_96dpi.jpg
Sarah Gebauer
Germany
150mm (125x) auch hoch vergrößert noch die zwei Farben orange und blau zu sehen, aber schwächer als im Fernglas
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
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
AGC13, tau Cyg AB 3m8 6m6 1.1'' 190° 2017 Cyg 21h14m47.49s +38°02'43.10"

../images/binary-star-orbits/AGC13-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Tau Cygni: Near equal orange with fainter nearby, could be triple. (There are 13 stars in the system. They ought to just call it an open cluster)
STF2807 8m7 8m8 1.9'' 309° 2016 Cep 21h17m33.47s +82°31'03.70"

../images/binary-star-orbits/STF2807-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (128x) Barely split without any noticeable difference in brightness.
BU163 AB 7m3 8m9 0.9'' 257° 2018 Equ 21h18m34.85s +11°34'08.20"

../images/binary-star-orbits/BU163-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (533x) Can resolve in 20" and once know where B is, can split with 8", but B is much fainter and is more a brightening in the first diffraction than at star [Several other fainter pairs]
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close but clean split momentarily with seeing, both yellow-orange, 3 delta mag, <1"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Close but definite split when seeing stills
★★ 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
René 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.
René 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
STT435 8m3 8m2 0.7'' 239° 2018 Equ 21h21m23.70s +02°53'14.60"

../images/binary-star-orbits/STT435-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
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
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
★★ B1008 AB 8m9 8m1 0.1'' 226° 2018 PsA 21h30m57.70s -36°32'49.70"

../images/binary-star-orbits/B1008-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Propus (means "forefoot") = Eta Geminorum: So cool! Bright orange star with B very close, ~1.5", just preceding, ~3 delta mag. B is in diffraction but is well separated & has its own airy disk, bluish white.
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.
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"
AD 4m8 6m9 196.9'' 44° 2014

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

Uwe Pilz
Leipzig (Germany)
60mm (198x) AB: Aufhellung innerhalb des ersten Rings
Robert Zebahl
Leipzig (Germany)
70mm (128x) AB: At 128x I was able to see this double at least elongated.
Sarah Gebauer
Germany
150mm (160x) AD: bei der Sichtung noch eher unsicher, welche der hellen Sterne die Komponenten AB enthalten, denn diese habe ich nicht getrennt, AD mit einem Abstand von 196'' stehen mit drei weiteren Feldsternen in einer mehr oder minder interessanten Konstellation ../projects/double-stars/sarah-gebauer/sketches/20200731%20Mu%20Cyg%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (171x) AB: Quite well split with noticeable fainter component.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/STF2822.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Yellow and light orange pair, ~1", 1 delta mag. Very pretty, subtle colors
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Yellow, 1 delta mag, 2-3”
BU75 AB 8m4 8m6 1.1'' 26° 2018 Peg 21h55m31.42s +10°52'49.50"
AB-C 7m7 12m5 35.3'' 211° 2012

../images/binary-star-orbits/BU75-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (533x) AB: With patience for poor conditions and some critical focus I get a good clean split, slightly unequal
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB-C: Yellow white and faint blue, well split. Did not see AB 1.1"
STF2873 AB 7m0 7m5 13.8'' 66° 2017 Cep 21h58m13.53s +82°52'10.80"

../images/binary-star-orbits/STF2873-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (25x) Easy to split with visible difference in brightness. Stands out immediately.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein gut getrenntes Pärchen, B ist eine halbe Magnitude schwächer und strahlt ein wenig kühler als A - eine richtig schöne Vergrößerung ist 20x, dann stehen beide Sterne sehr dicht und zeigen schön ihren leichten Farbkontrast
STF2863, xi Cep, 17 Cep AB 4m5 6m4 8.2'' 274° 2019 Cep 22h03m47.45s +64°37'40.70"

../images/binary-star-orbits/STF2863-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x well separable, but quite close together with a clear difference in brightness. At 71x very nice view.
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

René 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
COU136 9m2 7m6 0.4'' 19° 2015 Peg 22h10m02.22s +23°07'33.00"

../images/binary-star-orbits/COU136-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Awesome hairline at 533x, nice clean split at 1067x. The stars are split the diffraction patters merge at the boarders, perfect images. Appears more near equal than SkyTools data suggests
STF2881 7m7 8m2 1.3'' 76° 2017 Peg 22h14m34.67s +29°34'20.60"

../images/binary-star-orbits/STF2881-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange stars, ~1 delta mag, 2-3"
SHJ345, 53 Aqr AB 6m3 6m4 1.4'' 86° 2018 Aqr 22h26m34.30s -16°44'31.90"

../images/binary-star-orbits/SHJ345-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (240x) länglich, horizontnah
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
BU701 AB 7m3 9m6 1.1'' 179° 2017 Peg 22h28m07.24s +12°14'55.50"
AC 7m3 12m0 126.7'' 133° 2015

../images/binary-star-orbits/BU701-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (513x) AB: Orange star with a slightly mis-shaped disk
Mark McCarthy
Fremont (California/USA)
317mm (513x) AC: very wide separated bluish star 2-3 delta mag.
★★ 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

Christopher Hay
Seeheim (Germany)
180mm (120x) Neatly split, whereby the first difraction rings of each component touch the Airy discs of the other. Component A in the north seems marginally more yellowish than component B in the south.
Zeta Aqr is called Sadaltager, meaning „Merchant’s Luck“. It is framed nicely by Pi, Gamma and Eta Aquarii, with which it forms a striking triangular asterism known as „The Tent“. Moreover, Zeta Aqr is a true physical double. This constellation and the beautiful telescopic appearance warrant a two-star rating.
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".
8 Lac CHR112 Aa-Ab 5m7 0.0'' 131° 2018 Lac 22h35m52.28s +39°38'03.60"
STF2922 AB 5m7 6m3 22.3'' 186° 2018
A1469 AC 5m7 10m4 48.8'' 168° 2016
A1469 CD 10m4 9m1 42.4'' 116° 2016
A1469 AD 5m7 9m1 81.6'' 145° 2017
A1469 AE 5m7 7m2 335.2'' 239° 2016
DAL28 AG 5m7 14m1 77.6'' 193° 2015
COM8 BF 6m3 11m0 127.6'' 175° 2012
A1469 DI 9m1 13m3 10.0'' 227° 2015
DAL28 GJ 14m1 13m0 6.5'' 78° 2016

../images/binary-star-orbits/CHR112-Aa-Ab-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (32x) A1469 (CD): das Paar gehört zum interessanten Mehrfachsystem STF2922 - während bei 32x Komponente C nur knapp sichtbar ist, zeigt sich D wieder deutlicher - Abstand CD ist doppelt so groß wie BC (STF2922)
René Merting
Drachhausen (Germany)
100mm (32x) STF2922 (AB): AB: bei 32x sind beide Komponenten gut getrennt sichtbar - B im Süden ist eine halbe Größenklasse schwächer
BC: bei 32x schimmert südöstlich von der Komponente B ein ganz schwacher Lichtpunkt, die Komponente C, durch - Komponenten BC mit gleichem Abstand wie AB
nachrichtlich zu D: interessant ist das Mehrfachsystem allemal, denn in doppelter Entfernung weiter südöstlich steht eine vierte Komponente D (eigene Bezeichnung: A1469, D mit Helligkeit 9.08 mag), so dass 4 Sterne problemlos mit dieser Öffnung zu erfassen sind
BU1092 AB 8m3 8m3 0.4'' 223° 2016 Cep 22h36m08.65s +72°52'51.10"

../images/binary-star-orbits/BU1092-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Notched! Near equal. With seeing.
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
STF2944 AB 7m3 7m7 1.8'' 307° 2018 Aqr 22h47m50.05s -04°13'43.60"

../images/binary-star-orbits/STF2944-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (277x) Pretty close equal white pair, ~2.0", split.
HU985 9m6 9m9 0.7'' 134° 2016 Peg 22h47m54.00s +12°58'36.20"

../images/binary-star-orbits/HU985-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow I got it! Light orange star and a very faint star just outside first diffraction, very subtle and tough
STF2950 AB 6m0 7m1 1.1'' 274° 2018 Cep 22h51m22.51s +61°41'47.90"

../images/binary-star-orbits/STF2950-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice pair indeed. Bright yellow-white A and 2 delta mag B, clean split, ~2". May be third fainter much wider split (AC, 39.2" 11.05)
HO482 AB 7m3 8m3 0.6'' 13° 2017 Peg 22h51m26.66s +26°23'27.90"

../images/binary-star-orbits/HO482-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) A star does not seem round, but seeing is poor. Marginal.
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
HU987 9m2 9m7 1.2'' 75° 2016 Peg 22h55m43.52s +15°46'45.50"

../images/binary-star-orbits/HU987-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Well separated one delta mag pair, nice
BU180 AB 8m0 9m2 0.5'' 134° 2016 Cep 23h07m09.99s +60°49'57.10"

../images/binary-star-orbits/BU180-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Exceedingly fine split at best moments, hairline, 1 delta mag.
STT489, pi Cep AB 4m6 6m8 1.1'' 2016 Cep 23h07m53.84s +75°23'15.30"

../images/binary-star-orbits/STT489-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
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
STF3007 AB 6m7 9m8 5.5'' 92° 2017 Peg 23h22m48.67s +20°33'32.20"

../images/binary-star-orbits/STF3007-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist Komponente B ganz schwach östlich von A knapp getrennt zu erkennen - ein riesiger Helligkeitsunterschied von 3.5 Größenklassen
Mark McCarthy
Fremont (California/USA)
508mm (533x) Yellow-white A and a bit orange B, ~6" and three delta mag, nice pair [Ba,Bb is TOK 704, 8.4 and 0.8", should have been noticeable! try again!]
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.
STT500 AB 6m1 7m4 0.5'' 21° 2018 And 23h37m32.03s +44°25'44.50"

../images/binary-star-orbits/STT500-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Disk seems not round, but unsure
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
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.
René Merting
Drachhausen (Germany)
76mm (95x) bei 57x deutet sich an, dass es sich um einen Doppelstern handeln könnte - bei 95x zeigt sich dann ein extrem knapp getrenntes Pärchen - beide Sterne sind gleich hell
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"