Double Stars - R.A. 06h-12h

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 750
Visual Observations 1318
Sketches 119
Photographs 11
Observers 13
Berthold Fuchs, Sarah Gebauer, Christopher Hay, Gerd Kohler, Karsten Kopp, Winfried Kräling, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, Jörg S. Schlimmer, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000.0)
SIN128 AC 7m.3 7m.6 2.6" 193° 1985 Aur 06h01m14.73s / +31°32'28.10"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Even at high magnification there are no indications of a double star. Also the brightness seemed to be less than stated!?
STF825 AB 7m.9 9m.1 8.0" 146° 2015 Aur 06h01m37.21s / +36°30'55.70"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Nice, easy wide Struve, white A and light yellow B, not quite delta mag
BU16, 3 Mon 5m.0 8m.0 2.0" 354° 2016 Mon 06h01m50.42s / -10°35'52.60"
Uwe Pilz
Leipzig (Germany)
105mm (260x) schwache Aufhellung im ersten Ring ../projects/double-stars/uwe-pilz/sketches/3Mon.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter schwach ../projects/double-stars/uwe-pilz/sketches/bu16.jpg
STF830 AB 8m.9 9m.6 11.4" 264° 2019 Gem 06h03m26.56s / +27°38'32.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Dim pair for a Struve, slightly red color near equal stars, wide, part of a neat triangle with a slightly fainter star making the third (AC). Not physical
AG104 9m.6 10m.2 2.5" 81° 2019 Aur 06h03m34.99s / +35°49'53.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Very fine split of 1 delta mag white stars, about 3" separation, but still striking and small at this magnification
HDS824 8m.2 9m.2 2.3" 149° 2019 Ori 06h03m48.13s / +18°15'53.30"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Fine pair, yellow-orange A and white-yellow B, two delta mag
J310 9m.8 10m.0 2.4" 319° 2015 Ori 06h03m54.49s / +10°14'50.90"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Beautiful matched orange pair, nicely split, very delicate. [surprisingly not a physical pair]
J335 8m.4 9m.5 1.1" 270° 2019 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
STT128 & HU559 STT128 A-BC 6m.4 9m.3 39.5" 15° 2019 Aur 06h04m29.10s / +51°34'24.20"
HU559 BC 9m.6 10m.6 0.6" 309° 1999
René Merting
Drachhausen (Germany)
15x56 STT128 (A-BC): ein gut getrenntes Paar, Komponente BC liegt nördlich von A und ist gerade so sichtbar - A ist reinweiß und BC ist … schwach
HO228 7m.7 10m.2 2.4" 267° 2000 Ori 06h06m00.88s / +12°28'45.60"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Very fine indeed. A white and bright in comparison to B which is in A's glow but faint, resolved, ~2" and two delta mag
STF840 A-BC 7m.2 8m.9 21.5" 248° 2014 Ori 06h06m28.04s / +10°45'01.00"
BC 9m.8 10m.1 0.4" 126° 1997
Mark McCarthy
Fremont (California/USA)
203mm (205x) A-BC: White A and slightly blue B, wide, two delta mag. [Did not see BC, 0.4" near equal]
Mark McCarthy
Fremont (California/USA)
317mm (170x) A-BC: Wide blue-white and slightly red pair, 1 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) BC: B maybe elongated? Not certain.
MLB1065 AB 8m.8 9m.1 10.1" 238° 2014 Aur 06h07m03.10s / +41°45'41.30"
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, B appears with averted vision, can't hold it direct, very well split. Physical
STT131 7m.0 9m.4 1.5" 277° 2012 Aur 06h07m25.84s / +36°16'28.70"
Mark McCarthy
Fremont (California/USA)
178mm (410x) It begins to resolve better with 300x, obvious with 410x with seeing. A is a greenish blue and B is very faint, 1", very close, an excellent pair
Mark McCarthy
Fremont (California/USA)
317mm (270x) Very close, need seeing to resolve 2 delta mag white A and light blue B
STF851 8m.9 9m.5 2.9" 34° 2019 Ori 06h08m04.43s / +03°17'23.70"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Fine white nearly matched pair of white stars, very nice
STT132 7m.2 9m.6 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.
STF844 & ARN64 STF844 AB 8m.5 9m.3 23.4" 10° 2017 Ori 06h08m18.38s / +13°59'50.30"
ARN64 AC 8m.5 10m.4 31.9" 172° 2017
René Merting
Drachhausen (Germany)
18x70 AB: Komponente B steht unmittelbar nordwestlich von A und ist deutlich schwächer
AC: Komponente C ist schwächer als B und steht im SO von A, alle drei Sterne bilden eine Linie
BU17 AB 6m.9 9m.3 3.6" 192° 2019 Mon 06h08m25.39s / -11°08'46.60"
AC 6m.9 10m.8 10.2" 260° 2015
BC 9m.3 10m.8 9.3" 276° 1998
Uwe Pilz
Leipzig (Germany)
105mm (288x) Dreifachstern! (Burnham 17) ../projects/double-stars/uwe-pilz/sketches/bu17.jpg
STF848 AB 7m.3 8m.2 2.6" 110° 2019 Ori 06h08m30.36s / +13°58'15.80"
AC 7m.3 11m.7 18.1" 296° 2019
AD 7m.3 8m.3 28.3" 122° 2019
AE 7m.3 9m.0 42.6" 188° 2019
DH 8m.3 10m.0 54.0" 111° 2019
René Merting
Drachhausen (Germany)
18x70 AD: Komponente D ist mit etwas Abstand östlich von Komponente A zu erkennen
AE: Komponente E ist schwächer als D und steht südöstlich von A in doppeltem Abstand wie AD
DH: Komponente H ist noch schwächer als D und steht östlich in dreifachem Abstand wie AD
Robert Zebahl
Leipzig (Germany)
70mm (100x) AB: Well split with obvious difference in brightness.
Christopher Hay
Seeheim (Germany)
125mm (100x) AB: When idly viewing NGC 2169, the “37 Cluster” or “IC37”, I noticed that the brightest star in the 37, namely the one at the NW corner of the 3, is a nicely split double with a thin slice of darkness between the components. PA matches the top bar of the figure-3 well. Stelledoppie lists components of STF848 from A to K, but notes that all are either not physical or uncertain. To my eye only the A-B pair appears double-like.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: The "37" cluster. This pair is the star at the tip of the upper part of the three where it turns down to the center. Fine white pair, close but nicely split, two delta mag, busy field
Mark McCarthy
Fremont (California/USA)
317mm (170x) AB: Close bluish pair near the center of the open cluster NGC 2169
STF854 8m.8 9m.8 5.7" 321° 2019 Ori 06h08m32.08s / +05°48'01.20"
Mark McCarthy
Fremont (California/USA)
203mm (205x) White stars, one delta mag, wide. In a pretty winter Milky Way field
STF849 9m.2 9m.5 0.9" 241° 2015 Ori 06h08m44.48s / +17°24'07.00"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Snow man at this aperture and mag, near equal
STT134 & WAL42 STT134 AB 7m.5 9m.1 31.2" 189° 2016 Gem 06h09m15.94s / +24°25'40.30"
WAL42 AD 7m.5 12m.6 43.8" 251° 2015

Located in the northern part of Messier 35.

René Merting
Drachhausen (Germany)
100mm (32x) STT134 (AB): bei 32x zeigt sich südlich von A ein gut 1.5 Magnituden schwächerer Begleiter - ein ordentlich getrenntes Pärchen - im Umfeld nicht sehr auffällig (logisch bei einem Doppelstern in M 35)
Uwe Pilz
Leipzig (Germany)
120mm (360x) STT134 (AB): in M35 ../projects/double-stars/uwe-pilz/sketches/220227stt134-2.jpg
Robert Zebahl
Leipzig (Germany)
152mm (92x) 2022-02-27: At 30x the uneven pair AB appears widely separated. A shines in a glaring bright orange, B in the south appears slightly bluish. Then at 92x component D is also very faintly visible. All three components form an acute-angled, nearly isosceles triangle. Also at this magnification A appears bright orange, B gray-bluish. At 171x D still remains pretty faint.
COU1101 10m.8 10m.8 0.9" 167° 2015 Gem 06h09m35.99s / +26°29'49.10"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Just split, white, half delta mag, in a nice field near some open clusters
WEB5 7m.1 9m.2 43.8" 216° 2016 Aur 06h09m39.64s / +43°08'26.70"
René Merting
Drachhausen (Germany)
15x56 Komponente B zeigt sich ganz schwach südwestlich von A - ordentlich getrennt - A strahlt reinweiß, bei B bin ich froh, dass ich den Stern überhaupt erkennen kann
3 Gem AB 5m.9 8m.5 0.6" 347° 2008 Gem 06h09m43.99s / +23°06'48.50"
AC 5m.8 14m.4 18.8" 63° 2015
Robert Zebahl
Leipzig (Germany)
152mm (240x) AB: 2022-02-27: At 240x and 300x nothing visible which indicates a double star. Just average seeing.
STF869 8m.2 9m.1 24.5" 280° 2017 Mon 06h10m44.34s / -09°51'08.30"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x gut getrennt - Komponente B im Westen ist halb so hell wie A - dadurch leichter Farbkontrast, A weiß, B grauweiß - der Doppelstern ist auffallend, weil im Umfeld nicht viel los ist
STF860 8m.6 9m.8 5.9" 358° 2018 Gem 06h11m04.87s / +24°52'56.30"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Blue-white A and slightly red B, wide, ~2 delta, nice
STF845, 41 Aur AB 6m.2 6m.9 7.5" 358° 2019 Aur 06h11m36.59s / +48°42'39.60"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Relatively tight with visible difference in brightness.
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, 1 delta mag, wide
J2016, xi Ori AB 4m.4 13m.0 37.8" 187° 2008 Ori 06h11m56.40s / +14°12'31.60"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Xi Ori. There are a few faint stars around the bright white A star, but certainly the closest is the B. Surprised I can see it given A's glare. [5 star system all faint & wide]
AG107 9m.6 9m.8 1.5" 179° 2019 Gem 06h12m49.60s / +24°25'36.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very nice white pair, near equal, ~1.5" nicely split
HO22 8m.5 8m.6 0.9" 208° 2019 Ori 06h13m27.53s / +10°14'52.40"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Very fine hairline split, near equal. Nice!
HO23 BC 8m.0 11m.5 3.1" 245° 1991 Ori 06h14m14.70s / +14°26'55.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Excellent! BC is very delicate, very close to bright C, very faint and just appears with direct vision. Part of the widely separated S 509 AB
STF865 8m.1 10m.3 5.2" 69° 2018 Aur 06h14m22.32s / +51°09'59.30"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Faint B emerges with seeing, widely separated from white a. Physical
AG108 9m.5 9m.9 12.3" 278° 2015 Aur 06h14m27.34s / +38°23'41.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Wide near equal white stars
KUI24 6m.3 7m.2 0.3" 144° 2014 Ori 06h14m28.59s / +17°54'22.80"

../images/binary-star-orbits/KUI24-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Bright white, olive shape is the best I can see. Physical with 260-year period, it will tighten to invisibility the next 15 years
STF877 AB 7m.5 8m.0 5.7" 263° 2019 Ori 06h14m42.67s / +14°35'10.80"
Robert Zebahl
Leipzig (Germany)
70mm (44x) Well split, but close together. Little difference in brightness noticeable.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Near equal white, wide
BU1008, eta Gem, 7 Gem, Propus 3m.5 6m.2 1.8" 258° 2020 Gem 06h14m52.69s / +22°30'24.60"

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

Uwe Pilz
Leipzig (Germany)
105mm (260x) Aufhellung im ersten Ring
Uwe Pilz
Leipzig (Germany)
105mm (288x) sehr schwierig ../projects/double-stars/uwe-pilz/sketches/etaGem.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) Already comparatively easy at 180x. The faint companion can be seen well as a quite distinct, slightly elongated, partly round brightening. At 225x and above it becomes easy and immediately apparent, even if the diffraction rings of the primary component are not permanently visible due to the seeing. The primary component was shining in a bright orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Propus. Yellow A and blue-yellow B, 2 delta mag, 1.5" very nice
A2446 9m.0 11m.5 2.9" 103° 2007 Ori 06h15m29.11s / +19°31'22.10"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Can just keep faint B star with direct vision. It's quite faint, well away from A
STF880 8m.4 8m.7 5.6" 55° 2019 Ori 06h15m29.13s / +10°34'42.40"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Nice near equal orange-white, well split
STF872 AB 6m.9 7m.4 11.4" 216° 2020 Aur 06h15m39.06s / +36°08'55.30"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Well separated with significant difference in brightness.
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, wide, 1 delta or or less. Physical
BU894 7m.3 11m.6 5.1" 134° 2015 Ori 06h16m31.78s / +19°00'47.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Bright white A, B just appears with direct vision, brightens with averted, wide. Discovered with the 18.5-inch at 5.1", no change
J686 10m.5 10m.7 2.3" 49° 2015 Gem 06h17m26.20s / +22°25'37.00"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very fine pair, near equal to half delta mag white stars, nicely separated but pleasingly close pair
STF876 AB 9m.2 11m.8 8.7" 41° 2019 Aur 06h18m30.80s / +53°39'29.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Wide B needs averted vision to see
STF883 AB 9m.3 9m.7 3.5" 265° 2019 Aur 06h19m08.03s / +39°46'28.70"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Very fine 2+1 all nearly in a line. The two closest white stars are near equal, about 3" separated, nice. Physical
AG109 AB 9m.4 9m.7 2.4" 16° 2019 Gem 06h19m44.83s / +21°28'27.70"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very nice, half delta mag, nicely split white stars. Very good
AG323 AB 9m.0 10m.2 1.8" 49° 2015 Gem 06h19m45.23s / +22°06'38.80"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wow! pops with seeing, 1 delta mag, ~2". Very nice. Two other stars much fainter on the outer reaches likely part of system [these are AC and AD]
HU452 9m.5 10m.8 2.6" 343° 2001 Gem 06h19m46.83s / +22°18'16.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Light yellow orange and light blue stars, more than half delta mag, pretty wide [not physical]
STF889 AB 7m.6 9m.9 21.4" 245° 2017 Gem 06h19m51.77s / +25°00'49.10"
René Merting
Drachhausen (Germany)
18x70 mit etwas Konzentration sind beide Sterne getrennt zu erkennen - A und B sind halb so weit voneinander entfernt wie das nahe liegende Pärchen STTA74 - Komponente B im SW ist genauso schwach wie B bei STTA74, aber dadurch, dass er näher zum Hauptstern steht, ist er schwächer sichtbar
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x unscheinbarer als der 14' nordöstlich liegende STTA74 - die Komponenten von STF889 wirken beide schwächer als die von STTA74 - Komponente B im SW ist gerade so erkennbar, Helligkeitsunterschied mindestens 2 Größenklassen, B ist gut abgesetzt von A - Farbkontrast gelblich, B farblos
TDS3753 11m.2 11m.4 0.9" 78° 1991 Gem 06h20m30.31s / +25°05'21.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Quite faint B star, very tough, ~1" and 1 delta mag
STF884 8m.7 8m.9 8.9" 272° 2018 Aur 06h20m33.58s / +47°07'13.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Easy, wide, near equal, white
STTA75 7m.7 8m.9 47.2" 130° 2020 Gem 06h20m34.48s / +18°02'56.70"
René Merting
Drachhausen (Germany)
18x70 ein mit ordentlichem Abstand getrenntes Sternpaar - B im SO ist halb so hell wie A
STTA74 AB 7m.1 8m.9 57.4" 265° 2015 Gem 06h20m36.35s / +25°11'20.40"
AC 7m.1 12m.0 41.5" 291° 2015
René Merting
Drachhausen (Germany)
18x70 AB: westlich von Komponente A blinkt in ziemlich weitem Abstand die viel schwächere Komponente B hervor - A ist reinweiß, B wirkt grau
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x weit getrennt - Komponente B im SW ist 1.5 Magnituden schwächer und wirkt farblos gegen die weiß strahlende Komponente A
S513 AB 7m.3 8m.9 59.7" 258° 2016 Gem 06h21m14.48s / +21°07'56.70"
AC 7m.3 12m.0 47.4" 250° 2016
AD 7m.3 7m.6 264.9" 24° 2015
AE 7m.3 11m.3 83.8" 285° 2016
BE 8m.9 11m.3 40.7" 327° 2015
BT 8m.9 12m.2 37.8" 295° 2014
René Merting
Drachhausen (Germany)
18x70 AB: weit getrenntes Pärchen - Komponente B im Westen ist gut 1.5 Größenklassen schwächer und wirkt dadurch bräunlich ggü. der weiß schimmernden Komponente A
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x popeleinfach, weit getrennt - Komponente B im Westen ist gut 1.5 Magnituden schwächer - zurück auf 20x nach wie vor sehr einfach, ein unauffälliger Doppelstern
STF3116, FR CMa AB 5m.5 9m.7 3.9" 23° 2003 Mon 06h21m24.71s / -11°46'23.60"
Uwe Pilz
Leipzig (Germany)
105mm (130x) schwach, knapp außerhalb des ersten Rings, kein Problem
Uwe Pilz
Leipzig (Germany)
105mm (137x) einfach
Uwe Pilz
Leipzig (Germany)
105mm (198x) oberhalb ß Cma
STF898 AB 9m.0 9m.6 6.2" 122° 2018 Ori 06h21m57.42s / +10°58'16.50"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Equal pair, wide, may be part of triple, in nebulosity? [Is part of a triple, WAL 44 is AC, 9.00/11.28 26.5"]
STF881, 4 Lyn AB 6m.1 7m.7 0.7" 149° 2020 Lyn 06h22m03.57s / +59°22'19.50"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig wegen Helligkeitsunterschied
OSB3 9m.8 11m.0 7.9" 2020 Gem 06h22m23.33s / +22°43'07.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Extremely faint B, approximately 2 delta mag. B seen with averted vision only, well separated. It is a physical pair. W.H. Osborn, who has eight discoveries to his name, about whom I can't find any further information (I assume he is not the railroad tycoon in the Google search results)
STF899 7m.4 8m.0 2.2" 17° 2019 Gem 06h22m49.64s / +17°34'27.30"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Separated, but tight with visible difference in brightness.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal, rather wide, one a little yellow the other light blue-white
OL67 10m.9 11m.9 5.2" 39° 2015 Gem 06h23m00.44s / +22°13'12.80"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Averted vision only, wide, pops with seeing, just able to see it
BU1059, mu Gem BC 11m.5 12m.4 0.6" 265° 1944 Gem 06h23m02.65s / +22°29'24.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) A-BC is the very bright orange A star Mu Gem, with several faint widely separated stars around, the brightest of which is BC. BC was quite faint, flashing a definite elongation but no separation with averted vision, significant delta mag. Discovered in 1889 36-inch at 0.8", it has narrowed since
STF900, epsilon Mon, 8 Mon AB 4m.4 6m.6 12.2" 30° 2019 Mon 06h23m46.10s / +04°35'34.20"
Robert Zebahl
Leipzig (Germany)
55mm (42x) Relatively large distance and clear difference in brightness. The lighter component seemed white-yellowish, the weaker one slightly greenish-blue. The color contrast, however, was not particularly conspicuous.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Blau-rot ../projects/double-stars/uwe-pilz/sketches/epsMon.jpg
A2356 8m.9 9m.0 0.8" 263° 2016 Aur 06h24m59.81s / +42°32'45.90"
Mark McCarthy
Fremont (California/USA)
178mm (410x) I can tell is double with 148x, it appears as a near equal notched elongation. The notch gets stronger with each magnification jump, until 410x when it hairline splits at the best moments and best focus
STT140 AB 6m.9 10m.1 3.0" 119° 2016 Gem 06h26m37.73s / +15°31'25.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice 3 delta mag pair, wide, clean with seeing, bluish stars
STF914 6m.3 9m.2 21.1" 300° 2019 Mon 06h26m44.85s / -07°30'43.00"
René Merting
Drachhausen (Germany)
18x70 ein ordentlich getrenntes Pärchen, wobei die Komponente B westnordwestlich von A nur knapp sichtbar ist - Helligkeitsunterschied mindestens 3, wenn nicht sogar 4 Größenklassen
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x kommen beide Sterne wie großer und kleiner Bruder daher - Komponente B im steht NW in guter Entfernung zu A - Komponente A ist strahlend weiß, B wirkt aufgrund des Helligkeitsunterschiedes farblos - zurück auf 20x ist B auch noch knapp zu erkennen und immernoch ordentlich getrennt von A
AG112 AB 9m.8 9m.9 2.8" 209° 2019 Gem 06h27m30.03s / +24°32'00.80"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very pretty equal white, wide ~4". Not physical
BRT2351 10m.3 10m.9 4.4" 39° 2010 Gem 06h27m36.35s / +21°53'38.80"
Mark McCarthy
Fremont (California/USA)
508mm (333x) White, half delta mag, wide ~5", makes a wide equilateral triangle with two other stars. [not physical]
SHJ70, 15 Gem AB 6m.7 8m.2 24.7" 203° 2019 Gem 06h27m46.58s / +20°47'22.60"
AC 6m.7 12m.7 85.6" 35° 2015
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2021-02-22: Clearly split with noticeable difference in brightness. Pale orange with much fainter companion. Together with Nu Gem & 16 Gem in a nice curved star chain.
René Merting
Drachhausen (Germany)
18x70 AB: ein schönes enges Sternpaar, Komponente B ist SW ist ordentlich getrennt von A zu erkennen - etwas über eine Größenklasse Helligkeitsunterschied, dadurch leichter Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: Auch bei 21x trennbar ../projects/double-stars/uwe-pilz/sketches/220228_15gem.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Very pretty orange A, with a brown B, ~1.5 delta mag.
J1092 AB 11m.6 12m.5 6.8" 226° 2016 Gem 06h27m51.15s / +22°51'06.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) A bit faint, bluish, wide ~5", half delta mag
★★★ beta Mon, 11 Mon STF919 AB 4m.6 5m.0 7.1" 133° 2019 Mon 06h28m49.07s / -07°01'59.00"
STF919 AC 4m.6 5m.4 9.9" 126° 2019
BU570 AD 4m.6 12m.1 26.5" 56° 2014
STF919 BC 5m.0 5m.3 3.0" 109° 2019
René Merting
Drachhausen (Germany)
18x70 das Mehrfachsystem ist als 8 erkennbar, eine extrem knappe Berührung, wobei die Komponenten B und C im SO nur als ein Stern gesehen werden können - BC ist gleich hell wie A allein
René Merting
Drachhausen (Germany)
100mm (32x) A-BC: bei 32x ein wunderschöner eng stehender Doppelstern - die bei dieser Vergrößerung noch nicht trennbare Komponenten B und C im SO wirken leicht gelblich und ist leicht heller als A - die Komponenten A und BC wollen sich berühren, schaffen es aber nicht ;-)
BC: bei 64x wirkt BC leicht länglich wie ein Stäbchen - bei 107x dann der Aha-Effekt, es sind zwei Sterne, knapp getrennt und mit gleichem Positionswinkel wie A-BC - beide Komponenten B und C sind gleich hell und einzeln jeweils etwa eine halbe Größenklasse schwächer als A im NW
Uwe Pilz
Leipzig (Germany)
105mm (137x) Dreifachsystem, drei fast gleichhelle Sterne. Alle blau-weiß ../projects/double-stars/uwe-pilz/sketches/betaMon.jpg
STF905 AB 8m.2 9m.9 1.7" 130° 2016 Aur 06h28m53.76s / +40°07'11.10"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Excellent, superfine pair, 2 delta mag and 2" sep
STTA77, nu Gem, 18 Gem AB 4m.1 8m.0 112.8" 330° 2017 Gem 06h28m57.79s / +20°12'43.80"
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are wide apart. Large brightness difference. A pure white, B possibly slightly blue.
A physical double at a distance to us of 545 light years.
STF912 8m.8 10m.9 3.4" 28° 2017 Aur 06h29m46.47s / +36°36'11.40"
Mark McCarthy
Fremont (California/USA)
178mm (148x) B star is quite faint but can see it with direct vision, 2 delta mag from white A, about 4-5", a very nice pair. Full moon and haze affecting faint stars
STT141 AB 7m.7 9m.8 2.3" 144° 2013 Gem 06h30m01.34s / +17°54'23.80"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Beautiful blue-white A star and 2 delta mag B, nice split, ~2.5"
STF904 AB 10m.3 11m.2 4.9" 165° 2015 Aur 06h30m12.03s / +51°46'58.80"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Faint B about 5" separation, a little more than 1 delta mag. Physical
WEI12 8m.6 8m.7 8.6" 66° 2016 Gem 06h31m08.66s / +21°43'06.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal white, wide, unremarkable
STT143 & FOX147 STT143 AB 6m.2 10m.1 7.9" 103° 2016 Gem 06h31m09.99s / +16°56'19.00"
FOX147 AC 6m.2 11m.4 47.3" 346° 2015
Mark McCarthy
Fremont (California/USA)
203mm (333x) STT143 (AB): Very pretty yellow-white A star with blue-white B, 3 delta mag., well split
Mark McCarthy
Fremont (California/USA)
317mm (553x) STT143 (AB): Orange A, very faint B, ~3", PA due east. 3rd to the north is FOX 147
Mark McCarthy
Fremont (California/USA)
317mm (553x) FOX147 (AC): 3rd star in STT 143, to the north, faint and widely separated
STF908 10m.7 10m.7 8.6" 359° 2019 Aur 06h31m16.69s / +53°50'52.40"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Faint but seen easily, near equal, wide
STT519 8m.4 10m.9 8.4" 78° 2015 Gem 06h31m17.74s / +15°44'14.40"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Pretty 2 delta mag, wide, light yellow A and very light blue B. Physical
FAB5 & STF926 FAB5 Aa-Ab 7m.2 9m.6 0.9" 18° 1991 Mon 06h31m40.54s / +05°46'08.80"
STF926 AB 7m.2 8m.6 10.8" 287° 2017
Mark McCarthy
Fremont (California/USA)
317mm (170x) STF926 (AB): In a triangle of stars which points toward the Rosette Nebula. Blue-white A star and slightly red B, 1 delta mag, wide. The A star is FAB 5
Mark McCarthy
Fremont (California/USA)
317mm (553x) FAB5 (Aa-Ab): Misshapen disk at best moments, very difficult
TDS254 10m.6 10m.6 0.8" 287° 2016 Gem 06h31m46.04s / +21°24'25.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Just split, noticeable delta mag, yellow-white A star
★★ STF924, 20 Gem AB 6m.3 6m.9 19.9" 212° 2019 Gem 06h32m18.52s / +17°47'03.40"
BC 6m.9 13m.0 47.8" 144° 2014
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2021-02-22: Easy to separate with small difference in brightness. Conspicuous double star. White-yellowish & white-bluish.
René Merting
Drachhausen (Germany)
18x70 AB: das dicht stehende Paar fällt sofort ins Auge - Komponente A im Norden ist vielleicht eine halbe Magnitude heller als Komponente B, die leicht gräulich strahlt
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: At 22x bright, immediately conspicuous, although in a relatively star-rich surrounding. Moderate but beautiful color contrast: bright orange, subtle blue. Also at 44x very beautiful sight.
Robert Zebahl
Leipzig (Germany)
152mm (69x) AB: Easy, bright, moderately uneven. Nice contrast in color: slight orange, white-bluish.
STT145 7m.3 9m.9 1.4" 336° 2012 Gem 06h32m20.69s / +15°42'22.30"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Bright yellow-white B and very much fainter B, just outside of A's glare, ~1.5", 3 delta mag
J1956 9m.5 9m.9 9.8" 60° 2015 Gem 06h33m02.93s / +17°05'11.70"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Faint but wide pair, blue color due to faintness, one more visible than other. Seems in a string of three [not physical]
STF918 AB 7m.3 8m.2 4.8" 336° 2019 Aur 06h33m57.62s / +52°27'41.80"
Robert Zebahl
Leipzig (Germany)
55mm (40x) At 40x tight, at 55x well split with obviously fainter companion.
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, 1 delta mag, well split
S524 AB 7m.2 7m.4 53.0" 244° 2017 Gem 06h34m07.10s / +22°07'27.20"
René Merting
Drachhausen (Germany)
18x70 AB: popeleinfach mit dem FG - ein mehr als gut getrenntes Pärchen zweier gleich heller Sterne - die östliche Komponente wirkt ein klein wenig heller - A warmweiß, B blauweiß
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x zeigen sich zwei annähernd gleichhelle Sterne weit getrennt voneinander - Komponente B im SW wirkt kühler als A
AC: bei 32x ist südöstlich von A in doppeltem Abstand wie AB eine weitere Komponente erkennbar - C ist mindestens 2 Größenklassen schwächer als B - alle drei Sterne bilden ein schönes rechtwinkliges Dreieck, wobei die Ecke von A den rechten Winkel bildet - zurück auf 20x ist C auch noch knapp sichtbar
Uwe Pilz
Leipzig (Germany)
105mm (21x) selbst bei 21x einfach zu erkennen ../projects/double-stars/uwe-pilz/sketches/220228_s524.jpg
Robert Zebahl
Leipzig (Germany)
152mm (30x) 2022-02-27: Pretty bright, wide double star with small difference in brightness. Both components appear white.
★★ STT147 A-CD 6m.8 9m.8 44.5" 119° 2016 Aur 06h34m19.37s / +38°04'33.60"
AB 6m.8 8m.7 42.7" 74° 2016
CD 10m.6 11m.0 0.5" 109° 1957
Uwe Pilz
Leipzig (Germany)
105mm (200x) ../projects/double-stars/uwe-pilz/sketches/200123stt147.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) At 22x, the components A, B and CD are immediately conspicuous, where A dominates. They form a beautiful, acute-angled triangle. At 69x, color differences are also visible. A: subtle orange; B: grey-bluish; CD: tendency to orange. Rewarding, because the double stars STF 928 & STF 929 as well as the very conspicuous carbon star UU Aur are in close proximity and can partly be observed together in one field of view!
STF932 8m.3 8m.5 1.6" 305° 2019 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
★★ STF928 AB 7m.9 8m.6 3.4" 131° 2019 Aur 06h34m41.81s / +38°32'24.50"
AC 7m.9 12m.4 130.9" 124° 2002
BC 8m.6 12m.4 127.3" 124° 2015
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB: At 28x the double star already appeared elongated, at 62x beautifully separated, with component A shining in a warm, subtle orange. At 125x A appeared orange, B grey-bluish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB: kühl-weiß und lila ../projects/double-stars/uwe-pilz/sketches/200123stf928.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) AB: Clearly separated, but tight. Moderate difference in brightness. Nice view with the nearby double stars STT147 & STF 929 and the carbon star UU Aur!
Mark McCarthy
Fremont (California/USA)
178mm (148x) AB: Classic Struve, very lightly yellow-white stars, about 1 delta, well separated
J1093 9m.8 10m.5 1.3" 1959 Gem 06h34m43.85s / +26°05'20.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Tough near equal pair, I have trouble to resolve the elongation which appears in all powers through 533x, but can tell this is double
STF938, 14 Mon 6m.5 10m.6 11.0" 211° 2012 Mon 06h34m46.33s / +07°34'21.00"
Mark McCarthy
Fremont (California/USA)
317mm (170x) Bright A and very faint 4 delta mag B
STF929 7m.3 8m.4 6.5" 24° 2016 Aur 06h35m22.03s / +37°42'55.10"
Robert Zebahl
Leipzig (Germany)
152mm (69x) Easy to separate, clear difference in brightness, slight color contrast. Primary component showed a slight orange color, the color of the companion was not clearly defineable. Nice view with the nearby double stars STT147 & STF 928 and the carbon star UU Aur!
BU194 8m.6 8m.9 1.6" 278° 2019 Aur 06h36m17.41s / +37°59'31.40"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Very fine pair of near equal light orange stars, 1" separation very good
SHJ73, nu 1 CMa 5m.8 7m.4 17.4" 265° 2019 CMa 06h36m22.85s / -18°39'35.60"
Christopher Hay
Seeheim (Germany)
10x56 On tripod. Finely split. Attractive 6.3° field of view together with Nu2 and Nu3.
A physical double at a distance to us of 351 light years.
VDK1 AB 10m.3 11m.4 2.8" 44° 2019 Gem 06h36m29.25s / +26°43'39.50"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Attractive pair, approximately 2 delta and 3", slightly light orange A, well split. Sadly not physical. One of three discoveries by J. Vanderdonck
S529 AB 6m.9 9m.3 52.7" 130° 2019 Gem 06h37m33.90s / +12°10'50.00"
AC 6m.9 8m.1 143.5" 165° 2012
René Merting
Drachhausen (Germany)
18x70 AB: ein weit getrenntes Sternpaar - Komponente B im SO ist kupferbraun, die gut 2 bis 2.5 Größenklassen hellere Komponente A strahlt weiß
STF942 10m.1 10m.1 3.4" 245° 2019 Gem 06h37m40.87s / +23°38'54.20"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint near equal brightness, well split
STF943 AB 9m.2 9m.4 31.5" 135° 2017 Gem 06h37m47.00s / +23°10'36.00"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Not sure why this one was picked out as a double, it's such a rich field any could be any such pair. Wide near equal white
A2452 9m.3 9m.6 1.0" 92° 2016 Gem 06h38m07.10s / +19°52'38.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Fine near equal pair, well split but close
STF922 AB 7m.7 10m.8 9.5" 138° 2016 Cam 06h38m18.76s / +64°44'06.00"
AC 7m.7 11m.2 25.5" 2016
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-16: Component A looked slightly yellowish, components B & C appeared rather dim. ../projects/double-stars/robert-zebahl/sketches/2020-04-16_stf922.jpg
STF935 9m.2 9m.9 3.4" 324° 2019 Aur 06h38m32.20s / +52°17'40.60"
Mark McCarthy
Fremont (California/USA)
178mm (148x) 1 delta mag, about 5" separation, white stars
STF941 AB 7m.2 8m.2 2.0" 83° 2019 Aur 06h38m40.76s / +41°34'53.40"
AC 7m.2 10m.5 83.9" 135° 2015
Robert Zebahl
Leipzig (Germany)
102mm (28x) AC: Distant, faint companion that is less attracting attention. Used magnifications between 28x and 125x.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB: At 62x only visible as figure '8'. The difference in brightness is hardly noticeable. At 86x barely separated, obvious. Clearly separated at 125x, but still tight with a moderate brightness difference.
Mark McCarthy
Fremont (California/USA)
178mm (148x) AB: Wow, great pair. White A and light blue B, >1 delta mag and about 2", such a fine pair
STF934 9m.8 10m.5 3.9" 332° 2019 Lyn 06h39m06.40s / +55°02'30.20"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Pretty faint for a Struve, 1 delta mag, wide about 4", white stars
STT152, 54 Aur 6m.2 7m.8 0.8" 34° 2016 Aur 06h39m33.12s / +28°15'47.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STT152.jpg
J353 9m.4 10m.3 4.1" 65° 2015 Gem 06h39m57.85s / +16°21'39.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) White A and slightly red B, wide ~5", 2 delta mag
STF925 8m.1 10m.5 3.6" 92° 2016 Cam 06h40m10.00s / +67°19'24.50"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-04-16: At 100x and 133x not split.
BRT1208 7m.9 10m.5 5.1" 175° 2016 Gem 06h40m35.04s / +17°38'26.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy wide pair, white A and a little red B, ~2 delta mag
STF944 AB 8m.4 10m.2 6.4" 58° 2018 Aur 06h40m50.72s / +48°15'18.70"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Slightly yellow-white stars, 2 delta, wide companion. Physical
STF950, S Mon AB 4m.7 7m.8 3.0" 214° 2018 Mon 06h40m58.66s / +09°53'44.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Lovely white and 3 delta mag fainter B, approximately 4". In NGC 2264, the Christmas Tree Cluster
Mark McCarthy
Fremont (California/USA)
317mm (170x) This is the brightest star, forming the trunk, of the Christmas Tree cluster, NGC 2264. Bright white and wide 4 delta mag B star, well separated. Spent some time at 71x to look at the cluster as a whole.
STF949 9m.2 9m.7 3.6" 289° 2019 Mon 06h41m00.18s / +05°42'26.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint, well separated white stars with significant delta mag, almost 1 delta, about 5". Not physical
STF953 7m.1 7m.7 7.3" 330° 2018 Mon 06h41m09.41s / +08°59'05.00"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Easy light yellow pair, 1 delta mag, wide. Near NGC 2264, the Christmas Tree Cluster
STF954 AB 7m.2 10m.2 12.9" 153° 2015 Mon 06h41m09.60s / +09°27'57.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Nice white A, widely separated faint B, about 3 delta mag. In NGC 2264, the Christmas Tree Cluster
STF3117 9m.2 9m.8 0.9" 77° 2015 Mon 06h41m22.05s / +09°43'51.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very fine, split with seeing, dull white stars, significant delta mag, very close 1" In NGC 2264, the Christmas Tree Cluster
STF3118 AB 9m.8 9m.9 2.8" 174° 2019 Mon 06h41m30.09s / +09°49'48.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint but easy pair, wide, approximately 3" separation, almost 1 delta mag. Not physical. In NGC 2264, the Christmas Tree Cluster
KU27 10m.1 10m.4 6.9" 187° 2015 Gem 06h42m11.50s / +14°51'29.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy equal white, wide, in a rich field
STF956 AB 8m.0 10m.7 6.9" 194° 2015 Mon 06h42m40.55s / +01°42'58.20"
AC 8m.0 8m.9 36.3" 158° 2015
AD 8m.0 11m.1 56.4" 181° 2015
CD 8m.9 11m.1 27.2" 213° 2015
René Merting
Drachhausen (Germany)
18x70 AC: leicht - Komponente C zeigt sich gut getrennt im Südwesten von A und ist mehr als eine Größenklasse schwächer
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Faint B noticed with averted vision but can hold it with direct, a fine pair, A is in an arc of three similar magnitude stars. Not physical
A2823 8m.0 10m.3 4.5" 300° 2016 Mon 06h43m15.27s / +06°07'01.00"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White A and much fainter B, can see just see it with direct vision, wide about 5" and 3 delta mag. It is sharper with seeing. Not physical
A511 9m.6 10m.4 1.6" 157° 2016 Gem 06h44m20.42s / +28°22'08.10"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Wonderfully close pair, looks like the small snowman's head popped off the body, close split, 1 delta mag, white stars
AG119 8m.9 9m.1 1.5" 85° 2016 Gem 06h44m37.54s / +23°26'48.90"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Fine near equal white, nicely split ~1.5". There's another pair on the edge of the field, wider and brighter
★★ STF946 7m.3 9m.1 4.0" 129° 2019 Lyn 06h44m51.62s / +59°26'57.40"
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy to split with noticeable difference in brightness. Very nice view together with the triple system STF 948 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit 12 Lyn ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 100x and 129x easy to separate, quite uneven. Primary component appeared yellowish, the fainter one rather greyish. Fantastic view together with 12 Lyn (STF 948) in one field of view!
★★★ AGC1, 9 CMa, alpha CMa, Sirius AB -1m.5 8m.4 11.2" 67° 2020 CMa 06h45m08.92s / -16°42'58.00"

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

Uwe Pilz
Leipzig (Germany)
105mm (198x) mit ADV, ohne nicht trennbar. Eindeutig
Robert Zebahl
Leipzig (Germany)
120mm (150x) 2021-03-02: Used magnifications from 86x to 200x using a Baader yellow filter. The diffraction disk was relatively good visible, but the diffraction rings were noticeably in movement (Seeing 3/5).
Jörg S. Schlimmer
Germany
127mm (136x) not split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Sirius_Refraktor_2021_03_07_bear_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
203mm (368x) Small disk formed on diffraction spike at correct separation and PA (Feb. 2016)
Mark McCarthy
Fremont (California/USA)
317mm (443x) A faint yellow-orange disk, to the edge of Sirius A's diffraction and just below my spider's diffraction spike. I let Sirius pass beyond the field stop, and for an instant there was Sirius B, clearly separated, before it too passed beyond the field stop.
Jörg S. Schlimmer
Germany
305mm hard to split with CMOS Camera ../projects/double-stars/joerg-schlimmer/photographs/Sirius_20210224_res_best45_bear.jpg
STF957 AB 7m.5 9m.4 3.6" 91° 2019 Gem 06h45m10.02s / +30°49'33.50"
AC 7m.5 13m.8 19.3" 100° 2015
Robert Zebahl
Leipzig (Germany)
70mm (100x) AB: Too faint for a separation. Primary component visible, companion not. Used magnifications from 67x to 133x. Observation from city at moon (83%).
Robert Zebahl
Leipzig (Germany)
152mm (129x) AB: Easy with significant difference in brightness and moderate angular distance.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Lovely blue-white A and light orange B, pleasingly close and a good 2 delta mag
POU1983 11m.3 11m.6 2.9" 315° 2016 Gem 06h45m16.14s / +24°12'43.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Faint but easily seen, near equal, well split to wide, ~2.5" , bluish due to faintness
STT155 7m.1 10m.9 15.3" 260° 2016 Gem 06h45m23.51s / +24°40'20.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange star with 2x fainter B, also orange, due west, ~6"
A122 8m.9 9m.4 0.4" 24° 2016 Gem 06h45m27.02s / +29°21'59.80"

../images/binary-star-orbits/A122-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Nice light orange stars, hairline split with indifferent seeing, PA to the SW. Slight magnitude difference. Physical with 102.3-year period, I have the PA reversed in my estimate, it's to the NE -- still can claim it though. It is coming off apastron and will close slightly in the next 20 years. Aiken discovered in 1900 with the Lick 36-inch also at 0.4" -- 118 years since, so it has made a little more than one revolution
WFC42 10m.1 10m.8 4.5" 358° 2016 Gem 06h45m27.48s / +33°12'55.40"
Mark McCarthy
Fremont (California/USA)
508mm (205x) White stars, wide split, very slight delta mag, quite pretty. Physical pair
A2680 9m.6 9m.7 1.5" 159° 2016 Mon 06h45m51.88s / +03°24'01.30"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Nice! Very fine, with seeing, close less than 2", around 1 delta mag, light orange A and white B. A really fine pair
BRT146 11m.2 11m.8 3.6" 47° 2016 Gem 06h45m55.18s / +24°05'58.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Faint, 1 delta mag, ~1.5" well split
COU472 11m.4 11m.3 1.9" 83° 2016 Gem 06h46m07.21s / +22°33'06.80"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Faint but very fine pair, really pretty in the field, a little blue, half delta mag, ~1.5" Nice
★★★ STF948, 12 Lyn AB 5m.4 6m.0 1.9" 65° 2020 Lyn 06h46m14.15s / +59°26'30.10"
AC 5m.4 7m.0 8.9" 309° 2019

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

Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: Components A/B and C well separated, but tight. Significant difference in brightness. The fainter C companion appeared slightly orange, the brighter one white-bluish.
Robert Zebahl
Leipzig (Germany)
55mm (167x) AB: Components A and B separated, whereby the Airy disks slightly overlap. The difference in brightness was well visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf948.jpg
Robert Zebahl
Leipzig (Germany)
63mm (140x) AB: Components A and B split with almost no space in between. The difference in brightness was visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf948.jpg
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: Well split, relatively close together with significant difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Both components A + B clearly split, whereby the diffraction rings where merged together. A very nice view together with component C. I sketched this triplet, which reflects my impression well. Unfortunately, the distance and position angle are not particularly well observed. Also the difference in brightness I didn't noticed during my observation. ../projects/double-stars/robert-zebahl/sketches/2019-01-20_stf948.jpg
Robert Zebahl
Leipzig (Germany)
102mm (129x) At 28x the pair AC is nicely separated without any problems. The close pair AB is already recognizable at 86x as a clear figure '8', at 125x wonderfully separated. The components A & B appear yellowish. Very nice view together with STF 946 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit STF 946 ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) At 49x the pair AC is beautifully separated with a significant difference in brightness. At 100x, the close pair AB is also separated, although still very close together. A slight difference in brightness is noticeable. At 129x, the view is magnificent. The two bright components A & B present themselves yellowish, the fainter component C rather greyish. STF 948 can be well observed in a field of view with the neighbouring double star STF 946. Both show a nice overall scenery.
Mark McCarthy
Fremont (California/USA)
178mm (148x) AB: Gorgeous triple star, pale yellow A and B, and 1 delta blue C. really stunning. AB physical with a 733-year period
HO238 8m.9 9m.1 0.3" 174° 2013 Gem 06h46m20.91s / +18°12'08.20"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Barely hairline split at best moments, but conditions have a lot of haze and bloating. A half delta mag is noticeable. I can tell the star is a pair at 333x, but no where near resolvable
HWE15 8m.9 10m.3 13.2" 218° 2015 CMa 06h46m35.21s / -20°34'45.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange, a wide faint blue B star
POU2009 12m.6 12m.7 6.4" 215° 2015 Gem 06h47m00.33s / +23°35'21.90"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Just barely there, averted vision brightend it up, but I can still pull it out direct. Faint, bluish, wide, near equal
BRT2362 11m.9 12m.6 3.4" 2016 Gem 06h47m12.56s / +17°27'46.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Dare I say a glittering pair, faint but it twinkles, wide, bluish, probably parts of a plus one about twice as separated but with similar mag [not physical]
STT157 7m.2 9m.2 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
J992 11m.5 12m.3 4.0" 100° 2015 Gem 06h48m08.72s / +16°53'16.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) B star almost needs averted vision to see, but shows up direct when seeing stills. Wide ~5", 1 delta mag, nice pair [not physical]
STF958 AB 6m.3 6m.3 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.
Mark McCarthy
Fremont (California/USA)
178mm (148x) Near equal dull white typical Struve. Not much to look at but it's physical with a 2023 year period, with not much movement now but will whip around the A star pretty quickly when it reaches periastron 150 years from now
STF972 A-BC 8m.3 9m.3 12.5" 154° 2016 CMa 06h48m22.15s / -15°19'47.30"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ein schwaches, unscheinbares, etwas mehr als knapp getrenntes Sternpaar - B im SO ist nur unwesentlich schwächer (lt. Stelle Doppie aber doch 0.99 mag)
A58 AB 7m.4 8m.7 5.1" 161° 2016 Mon 06h48m35.78s / -04°04'32.60"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ein knapp getrenntes Pärchen - Komponente B im Süden ist eine Größenklasse schwächer und wirkt grau
A2731 AB 8m.2 9m.5 1.3" 67° 2016 Mon 06h48m39.38s / +07°37'20.40"

../images/binary-star-orbits/A2731-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
178mm (205x) Excellent pair, around 2 two delta mag, more than 1" separated, very fine, dull white A and light yellow B. Physical with a 247 year period
WFC45 10m.0 10m.5 7.0" 321° 2015 Mon 06h49m49.42s / +06°56'04.20"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair, wide, 1 delta. Does not seem like an obvious double
STF964 8m.9 9m.7 1.6" 183° 2019 Aur 06h50m21.58s / +43°45'15.20"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Exceptionally fine at this magnification. The pair is in one corner of an equilateral triangle of near same magnitude stars. B is half delta mag and very close about 2". Very nice
H5 108 A-BC 5m.8 7m.7 42.7" 66° 2015 CMa 06h50m23.34s / -31°42'21.80"
Christopher Hay
Seeheim (Germany)
10x56 On tripod. A-BC wide apart. Only 3° above my horizon shortly after meridian passage. A pulsates mysteriously in the flat air, while Kappa CMa 1° to the south, at the southern fringe of the constellation, pulsates equally mysteriously in a slightly shifted tact.
H5 108 is a physical double at a distance to us of 650 light years.
WFC46 & PAL3 WFC46 AB 11m.4 11m.7 9.2" 297° 2015 Gem 06h51m02.45s / +19°14'40.00"
PAL3 BC 11m.7 13m.5 5.6" 295° 2015
Mark McCarthy
Fremont (California/USA)
508mm (333x) WFC46 (AB): Wide bluish pair about half delta mag. I see a third star with averted vision pretty close to one of these stars, ~3-4" interesting [PAL 3 BC, 11.65/13.50 5.6"]
Mark McCarthy
Fremont (California/USA)
508mm (333x) PAL3 (BC): Third star seen with averted vision pretty close to WFC 46 B, ~3-4"
POU2065 12m.1 12m.9 4.8" 175° 2015 Gem 06h51m25.93s / +24°25'17.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pretty faint, pulled out with averted and held there, wide, about half delta mag. [not physical]
POU2072 9m.5 11m.3 9.8" 38° 2015 Gem 06h51m42.09s / +23°14'36.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy, white and blue, ~1.5 delta mag, pretty wide
HJ740 AB 8m.2 9m.1 21.2" 2015 Mon 06h51m46.17s / +00°27'35.90"
BC 9m.1 11m.8 9.1" 286° 2015
René Merting
Drachhausen (Germany)
18x70 AB: Komponente B ist nördlich von A knapp getrennt erkennbar - Helligkeitsunterschied vielleicht eine Größenklasse
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein ordentlich getrenntes Sternpaar - Komponente B wirkt halb so hell wie A
J56 9m.4 9m.7 1.5" 334° 2015 Mon 06h52m37.65s / +03°14'17.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very fine near equal pair, 1.5" separation, really good
STF974, 59 Aur AB 6m.1 10m.2 22.2" 224° 2016 Aur 06h53m01.41s / +38°52'08.90"
BC 10m.2 12m.8 25.6" 219° 2015
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: Easy, moderate distance, pretty uneven. A appeared white-yellowish, B only as a tiny star.
STF985 7m.8 8m.4 32.6" 323° 2017 Mon 06h53m56.06s / -04°23'32.80"
René Merting
Drachhausen (Germany)
18x70 leicht (bequem getrennt) und schön mit Farbkontrast - Komponente A im Südwesten ist leicht gelblich, B wirkt dagegen grau - ein paar schwächere Sterne im Umfeld sorgen dafür, dass der Doppelstern noch etwas mehr hervor gehoben erscheint
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein weite Trennung - ein schöner Farbkontrast, Komponente A südöstlich ist weißgelb, B im NW dagegen ist zartorange - zurück auf 20x ordentliche Trennung
STF982, 38 Gem AB 4m.8 7m.8 7.3" 145° 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) Bright orange and slightly red star, 2-3 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow and orange, 2 delta mag, wide separation
STF986 8m.3 9m.0 5.5" 163° 2019 Mon 06h54m54.08s / +09°29'56.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Easy Struve, around 1 delta mag, wide, light blue-white stars. Physical
H5 65, 17 CMa AB 5m.8 8m.7 42.9" 147° 2015 CMa 06h55m02.74s / -20°24'17.50"
AC 5m.8 9m.2 48.5" 187° 2015
AD 5m.8 9m.7 128.8" 187° 2015
BC 8m.7 9m.2 31.3" 247° 2015
CD 9m.2 9m.7 80.4" 187° 2015
René Merting
Drachhausen (Germany)
18x70 AB: ein mehr als ordentlich getrenntes Pärchen - Komponente B im SO ist gut 2.5 Größenklassen schwächer, aber noch gut erkennbar - schöner Farbkontrast
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 32x getrenntes Paar, Komponente B im Süden deutlich schwächer
AC: bei 107x wird westlich von Komponente B ein noch schwächerer Stern sichtbar, Komponente C - dieser Stern steht minimal weiter weg von A als B
J273 AB 9m.9 10m.3 4.4" 340° 2017 Gem 06h55m18.52s / +12°35'07.00"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal white, pretty wide
STF981 8m.7 9m.0 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".
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very finely split, white stars, nearly 1 delta mag. Appeared as a rod at 205x. Physical with a 1089.7-year period. Discovered in 1831 at 3.7", near apastron, it has narrowed considerably since
HN 123, pi CMa, 19 CMa 4m.7 9m.6 11.6" 12° 2016 CMa 06h55m37.40s / -20°08'11.70"
René Merting
Drachhausen (Germany)
100mm (107x) bis 107x vergrößert, aber mehr als eine kleine kaum wahrnehmbare Ausbeulung nach Norden war nicht drin - höher Vergrößern wegen schlechtem Seeing nicht ratsam in der Nacht - kurios, der Stern strahlte zweifarbig, bläulich im Norden und ein helloranger Rand im Süden - ob das ein Dispersionseffekt war oder hervorgerufen aufgrund der beiden eng stehenden Sterne, vermag ich nicht zu sagen
HO27 AB 9m.6 10m.1 3.7" 127° 2016 Gem 06h56m03.65s / +20°05'03.20"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice near equal, though mag difference is notable. Third slightly brighter a bit further out [this is AC, 9.64/9.71 23"]
BU326 8m.0 9m.5 0.5" 341° 1987 Mon 06h56m11.96s / +02°18'59.70"
Mark McCarthy
Fremont (California/USA)
178mm (333x) Seeing not great, so I only get a notched elongation at the highest mag the sky will support, only 333x. Needs a better night. Discovered at 1.2", so it has closed considerably, and I should not feel bad not seeing it with just 7-inch aperture
STF983 AB 8m.7 12m.7 10.6" 36° 2017 Gem 06h56m13.67s / +34°27'32.70"
Mark McCarthy
Fremont (California/USA)
508mm (205x) B is very faint for a Struve pair, it's wide, with a light orange A star, approximately 3 delta mag. Not physical
STF984 8m.7 10m.8 3.3" 155° 2017 Gem 06h56m16.59s / +32°26'41.40"
Mark McCarthy
Fremont (California/USA)
508mm (205x) This is a typical Struve, light yellow A, slightly orange B, approximately one delta mag and 4". Not physical
STF979 8m.5 9m.6 7.5" 211° 2017 Aur 06h56m36.65s / +46°32'19.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Classic Struve, 1.5 delta mag, white A and dull yellow B, wide
STF991 AB 8m.0 9m.2 3.8" 165° 2019 Gem 06h57m01.26s / +24°57'27.90"
AC 8m.0 10m.6 134.0" 202° 2017
CD 10m.6 11m.1 13.2" 2017
Sarah Gebauer
Germany
100mm (73x) AB: haarscharf getrennt, nordwestliche Komponente ist etwas heller und größer und die südöstliche steht ganz schwach daneben
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: bei 88x trennbar. Orange, Begleiter schwach ../projects/double-stars/uwe-pilz/sketches/210131stf991.jpg
Robert Zebahl
Leipzig (Germany)
152mm (92x) AB: 2022-02-27: Nice, obvious double star with moderate difference in brightness. The components are still relatively close together, but easily separable. The primary component appears bright orange with a faint companion.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: White and orange, 2 delta mag, ~5", PA to S.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Pretty off-yellow A and a little ruddy red B, nice
STT159, 15 Lyn AB 4m.5 5m.5 0.7" 237° 2020 Lyn 06h57m16.60s / +58°25'23.00"

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

Uwe Pilz
Leipzig (Germany)
105mm (200x) nicht getrennt im April 2020 ../projects/double-stars/uwe-pilz/sketches/200409_15Lyn.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) relativ einfach ../projects/double-stars/frederik-wanink/sketches/15Lyn.jpg
A2459 AB 9m.8 9m.8 0.4" 274° 2008 Gem 06h57m39.64s / +19°35'04.10"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Notched near equal at best moments
★★ STTA80 AB 7m.2 7m.4 124.1" 53° 2015 Gem 06h58m06.59s / +14°13'43.40"
AC 7m.2 8m.4 81.2" 112° 2015
Christopher Hay
Seeheim (Germany)
7x45 Handheld. AB are a well separated, matching pair. Immediately striking in field.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are a widely separated pair, and joined by a third, weaker, point of light, which is C, well separated. A charming little triangle.
Involved in (or making up?) Monti 4 asterism.
Robert Zebahl
Leipzig (Germany)
70mm (22x) All 3 components form a striking triangle and are slightly different in color. A (western component): white-bluish; B (northern component): white-yellowish; C (southern component): orange, partly slightly reddish. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stta80.jpg
STF1004 8m.1 9m.7 20.5" 89° 2015 Mon 06h58m27.93s / -11°25'51.40"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein schickes Pärchen, komfortabel getrennt - Komponente B im Osten ist deutlich schwächer, mindestens 1.5 Größenklassen - Farbkontrast, weil B so schwach ist - zurück auf 20x gelingt die Trennung weiterhin
J278 9m.9 10m.3 2.4" 147° 2008 Mon 06h58m36.18s / +06°41'10.90"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair, just brightens enough to split with averted vision
CPO7, eps CMa 1m.5 7m.5 7.9" 162° 2008 CMa 06h58m37.55s / -28°58'19.50"
Mark McCarthy
Fremont (California/USA)
203mm (113x) Adhara, epsilon Canis Majoris: Wow! Bright (+1.5 magnitude) and large A with small and much fainter close B (magnitude +7.5) to the south. Lovely double
A1061 & STF1000 A1061 AB 8m.9 9m.1 0.6" 42° 1999 Gem 06h59m21.15s / +25°14'00.20"
STF1000 AB-C 8m.1 9m.0 22.1" 67° 2016

../images/binary-star-orbits/A1061-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (32x) STF1000 (AB-C): bei 32x ein bequem getrenntes Pärchen - Komponente AB kühlweiß - Komponente C im Osten ist eine dreiviertel Größenklasse schwächer und grauweiß
Sarah Gebauer
Germany
100mm (73x) STF1000 (AB-C): sieht fast so aus, als hätte die westliche Komponente einen Gelbstich, bei 73x weit und deutlich getrennt
Robert Zebahl
Leipzig (Germany)
152mm (30x) STF1000 (AB-C): 2022-02-27: At 30x quite conspicuous, medium bright double star with nice separation. AB appears pale yellowish, the color of the slightly fainter companion C cannot be defined. The color impression remains even at 92x.
STF994 AB 7m.9 8m.1 26.4" 55° 2017 Aur 06h59m27.19s / +37°05'53.50"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Well separated, large distance, slight difference in brightness.
STF996 AB 8m.9 10m.8 9.8" 168° 2018 Aur 07h00m13.77s / +42°59'04.20"
Mark McCarthy
Fremont (California/USA)
178mm (148x) A neat triple, appears as an elongated triangle with A at the apex, B is next brightest closest, C one delta farther out separated twice as far as B. nice
★★ STF1007 AB 7m.4 11m.4 14.6" 300° 2015 Gem 07h00m37.12s / +12°43'24.20"
AC 7m.4 10m.0 21.9" 244° 2015
AD 7m.4 7m.7 67.7" 28° 2016
Christopher Hay
Seeheim (Germany)
7x45 AD: Handheld. Stands out immediately as double with clear PA in field of several similarly bright single stars. Unsupported, hand tremor prevents actually seeing each component singly, but by bracing arms in reclining chair the well-matched pair is clearly split.
A physical double at a distance to us of 914 light years.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AD well split. A is distinctly brighter and seems bluish. Nice in 4.5° FOV together with STTA80 ABC.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AD: Wide separation, small difference in brightness. Slight difference in color, but difficult to describe. Component A at least seemed rather white. South of STF1007 there is also the double star HJ3288 and the star HD52976, which appears in a bright orange. Together in one field of view a beautiful sight. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
★★ BU100 7m.3 11m.1 3.4" 259° 2016 Gem 07h00m56.55s / +12°24'00.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue. 4 delta mag, PA to west. Wide separation ~3" B is just seen, a very fine point.
STT163 AB 7m.2 8m.2 0.2" 115° 2011 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
ARN66 AF 6m.6 8m.3 172.0" 301° 2011 Gem 07h01m17.01s / +32°24'52.40"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. AF is an immediately striking wide pair. Viewed comfortably in 8.6° FOV together with very wide Rho Gem, a further physical pair.
Arnold 66 AF is a physical double at a distance to us of 462 light years.
STF1010 AC 7m.7 8m.8 22.3" 2017 Mon 07h01m27.05s / -03°07'03.30"
René Merting
Drachhausen (Germany)
18x70 ein schönes enges Pärchen - Komponente B zeigt sich nicht zu knapp getrennt nördlich von A - Helligkeitsunterschied eine Größenklasse - zwei sehr schwache Sterne flankieren nahezu symmetrisch im SO und SW das Paar - netter Anblick
BU573 7m.2 7m.8 0.8" 311° 2018 Mon 07h01m49.89s / -10°52'56.30"

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

Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/220228_BU573.jpg
Uwe Pilz
Leipzig (Germany)
105mm (247x) schwach gekerbt ../projects/double-stars/uwe-pilz/sketches/bu573.jpg
HJ3288 7m.3 8m.7 38.5" 247° 2015 Gem 07h02m18.43s / +12°34'54.20"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Easy to separate with moderate angular distance and a significant difference in brightness. Slight difference in color: white-yellowish, slightly orange. Nice view together with the double star STF1007 and HD52976, which appears in a bright orange. Sketched together with STF1007. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
A2462 AB 9m.2 9m.0 0.2" 246° 2020 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
HO342 8m.0 8m.7 1.2" 89° 2016 Gem 07h02m50.54s / +13°05'21.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow-orange and blue stars, PA to the east, 1 delta mag, tight but well split ~1".
A1575 8m.6 9m.3 0.8" 283° 2016 Lyn 07h03m01.14s / +54°02'55.40"
Robert Zebahl
Leipzig (Germany)
102mm (160x) Not clearly visible as double star.
Robert Zebahl
Leipzig (Germany)
152mm (225x) 2020-03-23: At 225x and 300x clearly elongated, partly seen as figure '8'.
★★ STF1001 AB 7m.8 9m.4 9.1" 66° 2019 Lyn 07h03m05.51s / +54°10'26.60"
AC 7m.8 9m.3 9.9" 58° 2019
BC 9m.4 9m.3 1.6" 2019
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-23: At 28x the pair A-BC is easy to separate. At 160x, the very close pair BC shows split. The component A appears slightly orange.
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/200409stf1001.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2020-03-23: At 22x, the wide pair A-BC already appears separated, but still very tight. At 69x, A appears in a subtle orange. The pair BC shows elongated and rather greenish-bluish. At 100x BC is already visible as figure '8' and almost separated, at 129x clearly separated. Components B and C are still very close together and equally bright. The color impression remains. An interesting and rewarding triple system! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1001.jpg
Mark McCarthy
Fremont (California/USA)
178mm (222x) BC: Wow excellent 2+1, with a brighter white A and BC is a near equal faint pair about 1" separation. Seen with 148x but better resolved with 222x
SHJ77, zeta Gem, 43 Gem, Mekbuda AB 4m.0 11m.5 87.3" 85° 2017 Gem 07h04m06.54s / +20°34'13.10"
AC 4m.0 7m.7 101.5" 347° 2017
AD 4m.0 12m.5 67.0" 355° 2017
Christopher Hay
Seeheim (Germany)
15x45 AC: Binoculars with internal stabilisation, handheld. AC are wide apart and a visually strong (though not physical) pair.
RST3489 7m.4 8m.4 0.6" 299° 1991 Mon 07h04m25.53s / -10°27'15.80"
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/220228_RST3489.jpg
STF1016 7m.4 9m.5 5.4" 150° 2018 Mon 07h04m38.29s / -11°31'26.40"
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/220228_STF1016.jpg
A2463 9m.8 10m.0 4.2" 214° 2017 Aur 07h05m07.90s / +41°53'08.40"
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, near equal, wide. Physical
STF1009 AB 6m.9 7m.0 4.4" 148° 2019 Lyn 07h05m39.83s / +52°45'31.30"
Robert Zebahl
Leipzig (Germany)
70mm (33x) Very nice view. Equally bright components, tight.
Mark McCarthy
Fremont (California/USA)
178mm (148x) Bright blue-white stars, about 4" separated, about one delta
★★ STF1014 9m.9 9m.9 2.0" 221° 2017 Gem 07h05m44.95s / +26°08'25.30"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Faint pair, noticeable magnitude difference, white, well separated
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint near equal brightness pair, ~3", PS to the SW.
D12 & STF1019 & RST3491, V569 Mon D12 AB 6m.5 10m.1 6.4" 282° 2003 Mon 07h05m49.64s / -10°39'36.30"
STF1019 AC 6m.5 9m.6 38.2" 292° 2011
RST3491 CD 9m.6 10m.4 0.9" 302° 1963
René Merting
Drachhausen (Germany)
12x42 AC: mit etwas Konzentration zeigt sich C extrem schwach nordwestlich von A - Abstand ordentlich
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB ../projects/double-stars/uwe-pilz/sketches/220228_D12.jpg
STF1013 9m.9 10m.6 3.8" 50° 2016 Aur 07h05m51.89s / +36°02'55.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Fine pair, white A and orangish faint B 2 delta mag, fairly close about 4"
J728 8m.8 10m.4 3.0" 73° 2016 Gem 07h06m05.16s / +19°03'11.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Dim pair, 1 delta mag, around 3". Physical
BU328 & STF1026, FN CMa BU328 AB 5m.7 6m.9 0.6" 115° 2018 Mon 07h06m40.77s / -11°17'38.50"
STF1026 AB-C 5m.4 9m.0 17.8" 350° 2011
René Merting
Drachhausen (Germany)
12x42 AB-C: trotz 17,8" Abstand keine Chance, der Helligkeitsunterschied ist vermutlich zu groß
STF1017 9m.3 10m.2 12.8" 255° 2018 Gem 07h07m10.44s / +16°50'21.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, near equal, wide. Physical
★★★ ENG28 AB 7m.9 7m.7 171.9" 99° 2015 Gem 07h08m00.24s / +15°31'42.90"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Widely split matched pair. Easy to find half a degree south of 45 Gem. Comfortably viewed in 8.6° FOV together with STTA 80 AB and STF 1007, all three systems well-to-wide split, a charming trio of doubles. Alternatively, ENG 28 can also be viewed together with Zeta Gem (Mekbuda) 5° to the north.
Engelmann 28 is a physical double at a distance to us of 152 light years.
There is an interesting quirk about the ENG designation, on which Stelledoppie notes: Some time after publication of the IDS, the designation for Engelmann was changed from EN to ENG and that for Engelhardt from ENG to ENH. This has led to considerable confusion between the two.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Pretty, wide equal finder split, white, nice field.
STT165, 45 Gem AB 5m.4 10m.9 15.9" 2017 Gem 07h08m22.04s / +15°55'51.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) 45 Gem. With apodizing mask. Bright light orange and very wide eleventh mag B, 4-5 delta mag, ~15". [not physical]
STF1027 AB 8m.5 8m.7 6.9" 356° 2016 Gem 07h08m46.74s / +16°54'31.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Near equal, pale white stars, wide. Physical
STF1022 6m.8 10m.1 5.5" 128° 2017 Aur 07h09m25.72s / +36°33'47.80"
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, >2 delta mag, well split about 5". Not physical
STTA83 & HO519 HO519 AB 7m.2 13m.0 32.5" 73° 2015 Gem 07h09m35.47s / +25°43'44.70"
STTA83 AC 7m.2 7m.8 123.3" 79° 2015
Robert Zebahl
Leipzig (Germany)
70mm (22x) STTA83 (AC): Wide pair, relatively bright, moderate difference in brightness. A: slightly orange; C: grey-blue. Southeast of the pair in a much larger distance there is another, fainter star, which appears orange, partly reddish. It does not belong to the system. All three stars form a beautiful right-angled triangle.
STF1021 A-BC 9m.5 9m.6 4.2" 15° 2019 Aur 07h09m38.52s / +38°28'27.10"
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, noticeable mag difference, wide. BC is COU 2064 10.3/10.5 0.3" not seen
STF1024 AB 9m.0 9m.2 1.4" 315° 2019 Aur 07h10m12.99s / +38°07'50.20"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Wow, superfine pair, about half delta mag, very close but split at low magnification small scale. The split is more obvious with more magnification, but actually the best images with 148x. Great pair, very light yellow-orange stars
HO518 8m.3 10m.3 3.0" 145° 2016 Gem 07h10m24.17s / +30°21'31.70"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Bright white and pale white, 2 delta mag, 3" separation. A nice pair in a string of stars
TDS4557 10m.7 10m.7 0.5" 122° 1991 Gem 07h10m58.01s / +27°46'52.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Very fine hairline split with seeing, dull white stars
BU1009, tau Gem AB 4m.4 11m.0 1.8" 163° 2004 Gem 07h11m08.39s / +30°14'43.00"
Mark McCarthy
Fremont (California/USA)
508mm (205x) B is a very fine point on the edge of bright A' yellow-orange diffraction, subtle. Burnham writes: "This fine and difficult pair was discovered at Mt. Hamilton with the 12-inch in 1881….The measures are sufficient to show from the common proper motion that this is a physical pair." Discovered at 1.8" separation
HJ3934 A-BC 6m.9 8m.5 13.6" 238° 2017 CMa 07h11m20.93s / -21°48'11.80"
Uwe Pilz
Leipzig (Germany)
105mm (180x) schwach
STF1035 8m.1 8m.4 8.7" 40° 2018 Gem 07h12m01.06s / +22°16'44.50"
Robert Zebahl
Leipzig (Germany)
16x70 2021-02-22: Separate, but very close together. Small difference in brightness visible.
Mark McCarthy
Fremont (California/USA)
508mm (205x) Very easy bright white equal pair. Physical
HDS999 6m.4 9m.1 0.3" 2012 CMi 07h12m07.50s / +05°28'27.70"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) I detect a bluish bump on one side of the orange A star at best moments, and assume this is the B star, but I'm unsure. It is just a discoloration along the rim with a very slight bump out. Seeing is not good enough to resolve
WEI14 7m.8 8m.9 2.1" 160° 2012 Gem 07h12m48.16s / +15°10'41.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) A yellow-orange, blue B, 1 delta mag, PA to south. Nice!
Mark McCarthy
Fremont (California/USA)
508mm (205x) Very pretty white stars, 2 delta and about 3" separation, in a rich field
STF1037 AB 7m.2 7m.3 0.8" 304° 2019 Gem 07h12m49.08s / +27°13'30.20"

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

Uwe Pilz
Leipzig (Germany)
105mm (260x) eingekerbt ../projects/double-stars/uwe-pilz/sketches/stf1037.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) bei 200x trennbar, beide gelb ../projects/double-stars/uwe-pilz/sketches/210131stf1037.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Hairline split at 205x but went to 533x to get clear view of it to drift through the field to tell PA. Slight magnitude difference. Really nice looking pair, masked down to 7-inches to get clean disks. Physical with a 118.35-year period, it will close rapidly and become undetectable during the 2030s, widening again in the 2040s
Frederik Wanink
Itterbeck (Germany)
254mm (640x) leichter, gleich hell ../projects/double-stars/frederik-wanink/sketches/STF1037.jpg
STF1025 AB 8m.4 8m.7 27.0" 130° 2018 Lyn 07h12m50.93s / +55°48'12.20"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Lovely wide near equal, blue-green color stars. Not physcial
J59 10m.2 10m.4 1.5" 204° 2016 CMi 07h13m09.27s / +02°50'40.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Faint pair, but seen nicely. Blue-white stars, near equal, ~1.5", nearly wide
STT167 AB 7m.4 10m.9 5.1" 163° 2017 Gem 07h13m30.95s / +32°08'43.70"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Too faint for a separation. Primary component visible, no sign of the companion. Observation from city at moon (83%).
Robert Zebahl
Leipzig (Germany)
152mm (270x) At a position angle of about 180° I sometimes had the feeling to see something of the faint companion, but not sure.
STF1048 9m.1 10m.1 5.9" 351° 2018 CMi 07h14m14.25s / +04°12'26.50"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Pretty wide, >1 delta mag, light orange stars
STF1033 AB 7m.8 8m.4 1.5" 278° 2017 Lyn 07h14m48.05s / +52°32'44.10"
AC 7m.8 10m.2 79.3" 273° 2017
Robert Zebahl
Leipzig (Germany)
102mm (160x) The pair AB appears clearly separated, but still pretty tight with a well visible difference in brightness. The faint C component is wide apart at a similar position angle. ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1033.jpg
BRT1227 9m.9 11m.7 8.1" 321° 2015 CMi 07h15m03.14s / +10°51'25.60"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Light yellow-orange A is easy to see, the B star is much fainter, can see with direct vision but sharpens with averted vision. Transparency is poor and the sky is bright with a waxing moon
STF1056 8m.0 8m.9 3.9" 299° 2017 Mon 07h15m34.34s / -01°51'36.80"
Mark McCarthy
Fremont (California/USA)
317mm (170x) Wide reddish pair.
★★ 145 CMa, Winter Albireo HJ3945, Winter Albireo AB 5m.0 5m.8 26.5" 50° 2020 CMa 07h16m36.84s / -23°18'56.10"
SHY508 BC 5m.8 6m.8 999.9" 165° 1999
Christopher Hay
Seeheim (Germany)
7x45 AB: On tripod. Very tight but definitely split. A tends towards orange. Proximity to A prevents determination of colour of B.
René Merting
Drachhausen (Germany)
8x30 AB: Winter-Albireo - ein eng stehendes Pärchen, ganz knapp getrennt - Komponente A im SW knallig orange, bei B ist schwer eine Farbnuance erkennbar, eher weißlich und deutlich schwächer als A
René Merting
Drachhausen (Germany)
10x50 AB: ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
Christopher Hay
Seeheim (Germany)
10x56 BC: On tripod. B is set off well from visually distracting A (which in turn is the primary of HJ3945, the Winter Albireo). C seen clearly and well framed in 6.3° field of view with Tau CMa at centre of field.
Shaya 508 BC is a physical double at a distance to us of 303 light years. Reported in E.J. Shaya, R. Olling, 2011: Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue. The C component is more than 3° to the south of the B component. Coordinates of C component (= HD 35578) are RA 07h20m32.5s, DEC -26°42'01".
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. Immediately striking as well-split pair. A flashing orange. Glare and scintillation of A prevent any definite colour impression of B.
René Merting
Drachhausen (Germany)
18x70 AB: ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
Christopher Hay
Seeheim (Germany)
42mm (12x) AB: Clean split. Orange and blue.
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x leuchtet Komponente A goldgelb, B im NO wirkt weiß ohne den erwarteten Farbstich, auch nicht bei 107x und auch nicht, wenn ich die Sterne leicht unscharf stelle - trotzdem sehenswert - auch bei 20x zeigen sich beide Sterne ordentlich voneinander getrennt, A strahlt jetzt noch tiefgelber, fast orange
Uwe Pilz
Leipzig (Germany)
105mm (37x) AB: sofort auffallend, blau-orange ../projects/double-stars/uwe-pilz/sketches/hj3945.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) AB: Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.
STF1053 7m.3 10m.8 13.7" 316° 2017 Gem 07h16m48.52s / +24°32'10.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White A and very faint B, can barely see it direct, it brightens with averted, wide about 15". Not physical
STT170 AB 7m.4 7m.7 0.6" 283° 2020 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
STF1061, lam Gem AB 3m.6 10m.7 9.9" 34° 2016 Gem 07h18m05.61s / +16°32'25.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Bright white A and very much fainter B which is a very fine wide point which sharpens with seeing
HEI725 10m.5 10m.7 1.1" 349° 2016 CMi 07h18m06.19s / +10°34'53.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Faint pair but sharp with seeing, nicely split ~1", less than half magnitude difference but it is noticeable. Nice pair
BRT1229 9m.9 11m.1 4.5" 353° 2016 CMi 07h18m20.96s / +10°50'07.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) B star needs averted vision to appear, widely separated ~4", faint light yellow A but there's a significant magnitude difference. [not physical]
BAL2265 AB 10m.0 10m.4 14.0" 93° 2016 CMi 07h18m30.00s / +03°27'37.00"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Faint, B actually needs averted vision to see well, very wide pair. conditions bad [not physical]
STF1068 AB 9m.3 9m.8 4.0" 350° 2019 Gem 07h19m49.31s / +13°22'22.40"
Mark McCarthy
Fremont (California/USA)
178mm (205x) A fine faint pair, noticable mag difference, wide about 5"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pumpkin orange pair, near equal magnitude, PA to north. Well separated ~4". Nice.
STF1050 AB 8m.1 8m.8 19.4" 21° 2020 Lyn 07h19m51.29s / +54°55'18.40"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Rather faint, obviously split with visible difference in brightness. View similar to STF 1062.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
A2862 8m.4 9m.6 0.8" 62° 2017 CMi 07h20m02.62s / +03°46'36.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very close, less than one disk width, 2 delta mag, light orange stars. Tough. Can't see B star at 667x
STF1066, delta Gem, 55 Gem 3m.5 8m.2 5.5" 229° 2018 Gem 07h20m07.39s / +21°58'56.40"

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

Robert Zebahl
Leipzig (Germany)
55mm (71x) Large difference in brightness. The fainter component was well separated, but just a very tiny star.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Easy to separate with relatively large distance. The companion appeared as a tiny, faint star.
Winfried Kräling
Marburg (Germany)
102mm (178x) ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1835UT-delta%20Gemini%20-%20Wasat-2.jpg ../projects/double-stars/winfried-kraeling/sketches/2022-02-02-1835UT-delta%20Gemini%20-%20Wasat-1.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) Nicht gesehen, wahrscheinlich ist der Begleiter zu schwach für leicht diesigen Himmel
Uwe Pilz
Leipzig (Germany)
105mm (288x) erster Ring in SSW heller, zweiter nur an dieser Stelle sichtbar
Mark McCarthy
Fremont (California/USA)
178mm (205x) Bright light yellow A and much fainter light orange B, wide about 6". Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wasat = Delta Geminorum: Pretty white-yellow and red-orange pair, PA to west, ~4".
A2863 9m.3 9m.5 1.2" 289° 2016 CMi 07h20m09.95s / -00°01'11.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) White near equal, very fine pair in dense field
STF1038 AB 8m.2 10m.3 11.5" 100° 2017 Cam 07h20m30.59s / +68°32'23.80"
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-16: Easy to split with quite a significant difference in brightness. The companion appeared pretty dim.
STF1074 AB 7m.4 7m.8 0.8" 172° 2015 CMi 07h20m31.07s / +00°24'13.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very nice, touching disks to hairline. White, near equal. Great! [There are three other fainter BU pairs not noticed.]
STF1073 7m.9 10m.2 9.0" 67° 2015 CMi 07h21m00.62s / +10°11'44.20"
Mark McCarthy
Fremont (California/USA)
508mm (553x) Pretty pair, wide, ~3 delta mag, blue-white A and ruddy B
STF1076 9m.5 9m.6 2.9" 108° 2015 CMi 07h21m01.96s / +04°03'23.60"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very fine near equal white stars, well split
STF1070 AB 8m.7 9m.3 1.7" 324° 2019 Gem 07h21m21.87s / +34°01'36.20"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Seen at zenith, a fine white pair, 1 delta mag, about 3", nice
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty close, 1.5", white, 1 delta mag, PA to NW.
BU901, 65 Aur AB 5m.1 11m.7 11.6" 10° 2015 Aur 07h22m02.69s / +36°45'38.30"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Light orange-yellow A, B appears widely separated with averted vision only, cant hold direct
STF1065, 20 Lyn 7m.5 7m.7 15.1" 256° 2018 Lyn 07h22m15.11s / +50°08'55.70"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Nicely split, moderate distance, similarly bright.
STF1062, 19 Lyn AB 5m.8 6m.7 13.8" 317° 2019 Lyn 07h22m52.06s / +55°16'53.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Clearly separated, moderate distance, noticeable difference in brightness. The colors seemed different, but not exactly definable.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
Uwe Pilz
Leipzig (Germany)
105mm (21x) ../projects/double-stars/uwe-pilz/sketches/200409_19Lyn.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Easy to separate, but still quite close together with visible difference in brightness. Color wise unremarkable.
Mark McCarthy
Fremont (California/USA)
178mm (148x) Bright, white, 1 delta mag, wide, parallax indicates physical
J366 AB 8m.9 10m.4 2.3" 136° 2015 CMi 07h24m01.28s / +12°04'27.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Pretty pairing, ~2.5", light yellow-orange A and a deepter yellow-orange B, 2 delta mag. Nice pair
STF1081 AB 7m.7 8m.5 1.9" 234° 2019 Gem 07h24m08.94s / +21°27'28.00"
AC 7m.7 9m.9 107.0" 63° 2017
Robert Zebahl
Leipzig (Germany)
102mm (28x) AC: Rather wide apart from component A with noticeable difference in brightness. Less conspicuous.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB: At 86x just separated, very close together with moderate difference in brightness. In relation to A, the components B & C are almost opposite each other. At 125x, A & B are easy to split.
Uwe Pilz
Leipzig (Germany)
120mm (180x) ../projects/double-stars/uwe-pilz/sketches/220319STF1081.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Very pretty blue-white A and slightly orange B, well separated about 2"
A2865 10m.3 10m.6 0.6" 107° 1997 CMi 07h24m40.32s / +05°16'51.00"
Mark McCarthy
Fremont (California/USA)
508mm (533x) At 533x i can tell is it not single, it's a bit smudgy, and with averted vision it clearly flashes an elongation. At 1067x I can't get a clean enough focus to resolve due to seeing
J1063 10m.6 10m.9 2.6" 56° 2016 CMi 07h25m19.23s / +03°12'10.70"
Mark McCarthy
Fremont (California/USA)
508mm (533x) B is on edge of direct vision, I can see some smudge there with direct vision but averted vision clears it up. ~2", 1.5 delta mag
STF1083 7m.3 8m.1 6.9" 226° 2019 Gem 07h25m35.30s / +20°29'42.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Unequal pair. At 22x very tight, at 44x well split. Fainter companion appeared slightly orange, brighter one white-bluish.
Uwe Pilz
Leipzig (Germany)
120mm (94x) ../projects/double-stars/uwe-pilz/sketches/220319stf1083.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, wide, 1 delta mag. A nice, typical Struve
HO346 AB 7m.0 11m.7 13.2" 59° 2016 Gem 07h25m54.13s / +18°08'51.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange and much fainter blue B, ~10" 3 delta mag. Nice!
STF1088 AB 7m.4 9m.4 10.9" 195° 2015 Gem 07h26m02.42s / +14°06'10.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White A and two delta mag B, well separated
STF1089 AB 8m.9 8m.9 7.2" 2016 Gem 07h26m11.97s / +14°50'25.30"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Near equal wide white, not physical
STF1090 AB 7m.3 8m.2 60.8" 98° 2017 Gem 07h26m27.33s / +18°31'00.80"
AC 7m.3 9m.5 49.0" 80° 2017
BC 8m.2 9m.5 20.9" 328° 2017
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are well split. Substantial delta-mag.
A physical double at a distance to us of 366 light years.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Pretty finder split, equal white. Is a 2+1 with 2x fainter BC.
Mark McCarthy
Fremont (California/USA)
317mm (553x) BC: Is a 2+1 with AC, C is 2 delta mag than fainter B.
A2866 9m.3 10m.0 0.7" 141° 2010 CMi 07h26m39.08s / +04°23'34.10"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) B seen only at the best moments, and very briefly as a very faint star ~0.5" sep and very much fainter than A star. Frustratingly tough since this should not be a problem usually except for tonight's poor transparency and average seeing
STT171 7m.4 9m.2 1.0" 138° 2012 Gem 07h26m39.61s / +31°37'11.90"
Mark McCarthy
Fremont (California/USA)
178mm (333x) ! Exceptionally fine, with seeing, white A and bluish B, 2 delta mag, B appears as a very fine point at A's diffraction ring, less than 1". Suspected at 205x, best seen at 333x
STF1095 8m.6 9m.3 10.3" 78° 2015 CMi 07h27m22.75s / +08°45'14.00"
Mark McCarthy
Fremont (California/USA)
203mm (333x) White stars, wide, 1 delta mag
STF1094 7m.6 8m.5 2.5" 97° 2019 Gem 07h27m25.99s / +15°18'59.00"
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 57x barely split with noticeable difference in brightness. At 100x well split, but still tight.
Uwe Pilz
Leipzig (Germany)
120mm (200x) ../projects/double-stars/uwe-pilz/sketches/220319stf1094.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) White, 1.5 delta mag, about 2", nice and cleanly split
S550 6m.9 7m.6 39.6" 116° 2019 CMa 07h27m34.48s / -18°29'30.80"
René Merting
Drachhausen (Germany)
12x42 ein bequem getrenntes Pärchen zweier fast gleich heller Sterne - B im Südosten ist eine viertel bis halbe Größenklasse schwächer und wirkt grauweiß, dadurch ein zarter Farbkontrast mit A
ES2625 & S548 ES2625 AB 7m.0 12m.4 11.9" 24° 2015 Gem 07h27m40.54s / +22°08'29.30"
S548 AC 7m.0 8m.9 35.3" 277° 2019
Christopher Hay
Seeheim (Germany)
15x45 S548 (AC): Binoculars with internal stabilisation, handheld. Clean split. Secondary very faint. Primary yellowish-orange, a colour impression confirmed (without split) in handheld 7x45. Seen together with Eskimo Nebula (stellar) in 4.5° FOV.
A physical double at a distance to us of 1199 light years.
René Merting
Drachhausen (Germany)
100mm (20x) S548 (AC): bei 32x ein weit getrenntes Paar - Komponente A strahlt schwach gelblich … eher dunkelgelb - Komponente C im Westen von A ist gut 1.5 Magnituden schwächer und dunkelgrau bis lachsorange - der Doppelstern steht isoliert, fällt aber nicht übermäßig auf - zurück auf 20x ist das Paar weiterhin gut getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) S548 (AC): bei 21x trennbar, orange und fahlblau ../projects/double-stars/uwe-pilz/sketches/210131s548.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) S548 (AC): Orange with a 2x fainter white star, PA slightly SW. AB is 12th mag and not seen
BU21, eta CMi 5m.2 11m.1 4.3" 28° 2016 CMi 07h28m02.08s / +06°56'31.50"
Mark McCarthy
Fremont (California/USA)
508mm (213x) Eta CMi: Easy bright yellowish star with a reddish much fainter B, wide
BAL1098 9m.3 10m.8 6.6" 122° 2015 CMi 07h28m12.83s / +00°35'16.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Easy pair, creamy white A and 3 delta mag B, wide
STF1086 8m.0 10m.1 12.2" 104° 2017 Aur 07h28m31.32s / +42°45'09.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Very light orange A and very light blue B, wide, 2 delta mag. Physical
rho Gem, 62 Gem A2124 AB 4m.2 12m.5 1.2" 272° 2006 Gem 07h29m06.72s / +31°47'04.30"
A2124 AC 4m.2 11m.6 221.6" 285° 2001
ALC3 AE 4m.2 7m.8 755.4" 355° 2001
A2124 CD 11m.6 13m.4 102.1" 271° 2015
ALC7 EF 7m.7 15m.4 2.8" -1° 1991
Christopher Hay
Seeheim (Germany)
7x45 AE: Component E is a fine pinprick of light. The distance to A is so substantial that the pair would not normally be felt to be a double. This makes it all the more interesting to contemplate that this is a true physical double in our galactic neighbourhood at 59 light years distance to us. ALC = Allen, C., published in 2000.
A2868 8m.6 9m.0 0.7" 16° 2019 Gem 07h29m09.44s / +12°52'45.50"
Mark McCarthy
Fremont (California/USA)
178mm (333x) ! Strongly notched to hairline at 205x, steady hairline split at 333x with seeing, very noticeable magnitude difference
STF1102 AB 7m.4 9m.2 7.7" 45° 2016 Gem 07h30m26.25s / +13°51'54.00"
AC 7m.4 13m.2 21.8" 77° 2015
AD 7m.4 8m.0 111.9" 131° 2015
BC 9m.2 13m.2 15.9" 91° 2015
BE 9m.2 12m.0 30.4" 2015
Christopher Hay
Seeheim (Germany)
7x45 AD: Handheld. Clear, almost wide, split. Component A distinctly brighter.
A physical double at a distance to us of 148 light years.
Christopher Hay
Seeheim (Germany)
15x45 AD: Binoculars with internal stabilisation, handheld. Wide split. A visually strong pair.
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Easy white A and ruddy B, wide, 1 delta. Physical
STF1103 7m.1 8m.6 4.2" 245° 2020 CMi 07h30m33.61s / +05°15'16.80"
Uwe Pilz
Leipzig (Germany)
105mm (137x) einfach, unscheinbar
Mark McCarthy
Fremont (California/USA)
317mm (170x) Pretty blue-white and orange-red stars, close but split.
STF1106 9m.4 9m.5 10.7" 35° 2017 Gem 07h31m21.02s / +16°18'38.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Easy wide white pair, noticeable magnitude difference
STF1108 6m.6 8m.2 11.7" 179° 2019 Gem 07h32m50.63s / +22°53'15.40"
Robert Zebahl
Leipzig (Germany)
16x70 2021-02-22: Separated with clearly visible brightness difference. The primary component appeared whitish, the companion appeared slightly separated only as a very faint tiny star.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein sehr ungleiches enges Paar, aber klar getrennt - Komponente B im Süden ist knapp zwei Größenklassen schwächer - Komponente A buttergelb - zurück auf 20x verschmilzt Komponente B förmlich mit A zu einer sehr ungleichen 8, in guten Momenten sind beide Sterne aber dennoch schon getrennt sichtbar
Uwe Pilz
Leipzig (Germany)
105mm (130x) einfach
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very lightly yellow A and very light blue B, wide, 2 delta, a pretty pair
BU22 AB 8m.6 10m.9 6.3" 151° 2017 Gem 07h33m14.80s / +32°51'42.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Wide and uninteresting 2 delta mag
STF1116 7m.8 8m.5 1.7" 95° 2019 Gem 07h34m32.02s / +12°18'16.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty tight white, near equal magnitude, 2-3", PA to east. Nice pair.
★★★ STF1110, alpha Gem, 66 Gem, Castor AB 1m.9 3m.0 5.4" 53° 2020 Gem 07h34m35.86s / +31°53'17.80"
AC 1m.9 9m.8 71.6" 164° 2020
AD 1m.9 10m.1 179.8" 221° 2017

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

Christopher Hay
Seeheim (Germany)
20x60 AB: Handheld in reclining chair, binoculars with internal stabilisation. 16 April 2022 (5.5" angular distance according to database): Distinctly elongated, like a rectangle at the transition to a figure-8.
Christopher Hay
Seeheim (Germany)
26x42 AB: 13 May 2022 (5.5" angular distance according to database). Moon four-fifths full a few degrees north of Spica in Virgo. 70mm binoculars stopped down to 42mm aperture. Directly after looking the Moon I was able to split Castor AB definitely. Could hold this for a full minute, only then did the split start to become uncertain. Repeated the observation several times, found the split to be definite each time.
Christopher Hay
Seeheim (Germany)
32x70 AB: 13 March 2022 (5.5" angular distance according to database): Moon only 6° away and two-thirds full in the middle of Gemini. After concentrated observation of the Moon I slewed quickly to Castor to exploit the heightened acuity provided by viewing the bright Moon. Castor clearly split with fine black between A and B. After a while the split became more difficult but could still be held.
Followed this up with the same eyepiece previously used in the achromatic 70/400 binoculars now placed in 71/400 fluorite apochromatic telescope, thus again yielding 32x. Again A and B split after observation of the Moon, but harder to hold with the mono apochromat than with the bino achromat.
Christopher Hay
Seeheim (Germany)
36mm (33x) AB: 16 April 2022 (5.5" angular distance according to database): With Käsemann (KSM) polarising filter at 33x two kissing Airy disks which seem to move apart in good moments, but this is uncertain. Without filter at 33x just a squat figure-8 far removed from separation.
With polarising filter at 40x definite separation, fine first diffraction ring of component A. Without filter a stretched figure-8 with no separation.
At 50x clear and stable separation with and without filter. Best view at 66x, a ghostly pair in pitch-black FOV, the first diffraction rings of A and B merging, that of B very faint.
With a Baader Neodymium filter the positive effects are similar to those of the KSM polarising filter, but the clarity of separation is not quite as great as with the polarising filter.
Robert Zebahl
Leipzig (Germany)
55mm (27x) AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.
Robert Zebahl
Leipzig (Germany)
63mm (26x) AB: Experiment to determine the smallest magnification to separate Castor. I observed on 2022-05-09, 2022-05-11 & 2022-05-18.
At 26x and 30x easily seen as a double star, but not clearly separable due to outshining. At 70x of course easily separated. Stopped down to 30mm aperture, Castor appeared partially separated at 26x, but very barely. The right viewing position at the eyepiece was important. At 30x with 30mm aperture, Castor was cleanly separated, but extremely tight.
Following a hint from Christopher Hay, I also used a red filter from Baader to avoid outshining at full aperture. Now also a separation at 26x was possible, whereby the components were extremely close to each other.
For me a magnification of 26x seems to be the minimum to separate Castor cleanly, if the brightness of the components is reduced sufficiently.
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.
Christopher Hay
Seeheim (Germany)
76mm (50x) AB: 18 February 2021: At 23x oval-elongated with clear position of component A. At 50x finely split. At 83x best sight with first diffraction rings slightly overlapping. At 100x nice pattern of the Airy disks and the overlapping first and second diffraction rings of both components.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 32x wirkt der Stern leicht länglich - bei 107x stehen die beiden Sterne schön eng mit überlagernden Beugungsscheibchen, die Komponenten sind dennoch getrennt erkennbar - Komponente B im Osten ist eine halbe Magnitude schwächer - ganz schwacher Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: blauweiß-weiß ../projects/double-stars/uwe-pilz/sketches/Castor.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) AB: 13.03.2017: Beide Komponenten gelblich mit geringem Helligkeitsunterschied, bereits bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_02_alpha%20Gem_Castor.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Castor. A is a very pale yellow and B is yellow-green, 2 delta mag, very bright, pretty wide, some fainter stars about. Physical with a 459.8-year period
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Two fat spotlights in space. Component B seems greenish at first sight (using a first-class reflector free of chromatic aberration), and certainly has a different hue than component A. The second diffraction rings of A and B meet.
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/Castor.jpg
HJ425 BC 11m.1 11m.4 8.5" 46° 2017 Gem 07h34m59.31s / +24°14'23.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) A component of STF1113 AB. A is light yellow-orange, BC is widely separated from A, itself a pretty wide pair of blue stars. Physical
MAD3 9m.9 9m.9 3.7" 120° 2019 Lyn 07h35m45.61s / +43°02'05.30"
Mark McCarthy
Fremont (California/USA)
178mm (333x) Very faint equal pair near STT 174, amazingly not physical
STT174 6m.6 8m.3 1.9" 92° 2017 Lyn 07h35m56.00s / +43°01'51.40"
Robert Zebahl
Leipzig (Germany)
70mm (133x) The obviously fainter component could be permanently seen in the right position angle as brightening on the first diffraction ring.
Mark McCarthy
Fremont (California/USA)
178mm (333x) Lovely white and dull blue, 2 delta mag and 2" separation. Faint pair MAD 3 in same FOV making a double-double
KU30 9m.3 10m.3 3.2" 111° 2016 Gem 07h35m59.79s / +34°19'41.10"
Mark McCarthy
Fremont (California/USA)
203mm (205x) About one delta mag, well split, slightly orange stars
STF1120 AC 5m.6 9m.7 19.8" 37° 2015 Pup 07h36m03.89s / -14°29'33.90"
René Merting
Drachhausen (Germany)
12x42 trotz größter Konzentration schwierig - C scheint wie ein Spike an A zu kleben - eine Trennung ist trotz 19,8" Abstand nicht möglich, vermutlich weil der Helligkeitsunterschied zwischen beiden Sternen von 4.1 mag zu groß ist
★★ STF1121 AB 6m.9 7m.3 7.4" 306° 2019 Pup 07h36m36.06s / -14°29'03.70"
Robert Zebahl
Leipzig (Germany)
152mm (30x) Fantastic view of the double star in the middle of the beautiful star cluster Messier 47! Bright, moderate separation with little difference in brightness.
STF1119 8m.1 9m.3 3.3" 353° 2019 Gem 07h38m30.23s / +33°42'41.40"
Mark McCarthy
Fremont (California/USA)
203mm (205x) V345 Gem, variable of the delta Scuti type. A is white with a pink tinge. B is light blue, about two delta mag, well split around 3"
★★ BRD2 AB 9m.2 9m.5 0.9" 187° 2016 CMi 07h39m46.65s / +05°16'25.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wow! Exceptionally fine pair, white, near equal, nicely split, just outside of Procyon's glare. Great! [AB,C 14th mag not seen]
BGH3 AB 7m.3 9m.0 57.9" 113° 2017 Mon 07h39m59.33s / -03°35'51.00"
René Merting
Drachhausen (Germany)
18x70 beide Komponenten sind mit ordentlichem Abstand getrennt sichtbar - Komponente B im SO ist gut 1.5 Magnituden schwächer und wirkt gegen die strahlend weiße Komponente A eher graubraun
★★ STF1126 AB 6m.5 7m.0 0.9" 176° 2019 CMi 07h40m06.99s / +05°13'51.90"

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

Uwe Pilz
Leipzig (Germany)
105mm (288x) beide gelb. Es war schwierig, die hellere Komponente zu erkennen. Direkt neben Prokyon. ../projects/double-stars/uwe-pilz/sketches/210330STF1126.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow, very close <1" hair-split, near equal brightness
AG143 9m.1 10m.1 5.7" 98° 2015 CMi 07h41m10.49s / +01°08'18.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Pretty orange and blue, light colors, wide, faint
AG142 9m.8 10m.4 1.7" 21° 2000 Gem 07h41m26.46s / +23°11'40.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very fine close pair, 1 delta mag, B brightens with averted vision but can see it direct
STF1123 9m.2 9m.8 3.6" 167° 2019 Gem 07h41m31.99s / +33°24'34.80"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Pretty white pair, ~3", slightly less than two delta mag
STF1132 8m.1 8m.5 20.1" 235° 2017 Mon 07h42m12.50s / -03°31'10.40"
René Merting
Drachhausen (Germany)
18x70 ein dicht stehendes Pärchen - Komponente B im SW ist nur leicht schwächer - leichter Farbunterschied - STF1132 fällt eher als Doppelstern auf als der ebenfalls weiter westlich im Gesichtsfeld stehende Doppelstern Bgh
STT179, kappa Gem, 77 Gem 3m.7 10m.0 7.2" 243° 2019 Gem 07h44m26.87s / +24°23'53.30"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Observation at nearly full moon: Fainter companion was not visible.
René Merting
Drachhausen (Germany)
100mm (213x) bei 213x mit viel Geduld ist blickweise Komponente B südwestlich von A im Beugungsscheibchen erkennbar - kaum wie ein Stern, einfach nur eine schwache Aufhellung
Robert Zebahl
Leipzig (Germany)
120mm (200x) Although the optics were not yet completely cooled down, the fainter component could be seen slightly outside the first diffraction ring as a tiny star in moments of steady air.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Kappa Gem. A looks like a kaleidoscope with the mask, colorful. B is a nice fine 8th mag star, a white hard point. Well separated ~8"
A674 8m.2 9m.8 1.1" 125° 2008 Gem 07h44m38.11s / +31°06'50.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close and faint, just split
STF1107 8m.7 10m.1 1.2" 215° 2016 Cam 07h45m14.87s / +75°47'51.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide separation, 1 delta mag, PA to NW.
STF1138, 2 Pup AB 6m.0 6m.7 16.7" 341° 2019 Pup 07h45m29.14s / -14°41'25.70"
René Merting
Drachhausen (Germany)
12x42 ein sehr helles Pärchen - B steht im Norden und ist ganz knapp getrennt von A erkennbar - Helligkeitsunterschied eine halbe Magnitude
HO246 7m.6 11m.6 2.6" 227° 1991 Gem 07h45m32.14s / +25°59'19.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) A is an orange star, pretty bright, B only shows with averted vision and I can barely it hold direct. ~2". white
STF1122 7m.8 7m.8 14.9" 186° 2019 Cam 07h45m52.47s / +65°09'28.10"
René Merting
Drachhausen (Germany)
18x70 ein genialer, heller Stern für 18x-Ferngläser - ein wunderschönes enges Sternpaar, wo drei Blatt Papier dazwischen passen
Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-05-15: At 22x immediately apparent with a beautiful separation between the equally bright components. One component appeared slightly bluish, the other light orange. At 44x the subtle color difference can be seen a bit better. The double star is in a nice star field together with 51 Cam. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1122.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 72x ein gut getrenntes Pärchen zweier gleich heller Sterne - trotz vieler gleich heller Sterne im Gesichtsfeld wirkt das Doppel gut isoliert
HO247 7m.7 9m.2 0.5" 257° 2012 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
STF1137 8m.0 9m.1 3.1" 133° 2016 CMi 07h46m35.35s / +04°07'50.10"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Der schwächere Stern ist nur indirekt sichtbar, deshalb schwierig ../projects/double-stars/uwe-pilz/sketches/210330STF1137.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light orange and blue, pretty wide, 1.5 delta mag
STF1127 AB 7m.0 8m.4 5.6" 340° 2019 Cam 07h47m00.43s / +64°03'07.30"
AC 7m.0 9m.7 11.6" 178° 2019
BC 8m.4 9m.7 16.9" 173° 2019
René Merting
Drachhausen (Germany)
18x70 AC: von den Rahmendaten ist eine Trennung von A und C eigentlich möglich, aber vermutlich ist der Helligkeitsunterschied zwischen beiden Sternen von 2.7 mag zu groß - ich konnte C nicht entdecken
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-15: At 31x all three components are visible, with B still very close to component A. Component C is rather dim overall. At 57x, A appears white-yellowish, B slightly orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1127.jpg
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ist B ganz dicht nördlich an A angrenzend erkennbar (knapp getrennt), B etwas heller als C im Süden - bei 72x wird die Trennung einfacher und alle drei Sterne stehen fast auf einer Linie
AC: bei 45x ist C ganz schwach südlich von A erkennbar - bei 72x schätze ich, etwas mehr als die doppelte Entfernung AB, C wirkt grau, während A und B weiß strahlen
PTT11 9m.1 10m.4 4.6" 2017 Lyn 07h47m02.38s / +38°32'22.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair white, B flashes brighter with averted vision. New designation, E. Pettit, active in the early 20th century
STF1141 AB 8m.4 9m.4 17.5" 10° 2017 CMi 07h47m02.47s / +00°01'06.10"
René Merting
Drachhausen (Germany)
18x70 AB: ganz dicht nördlich über Komponente A ist B knapp getrennt als schwaches Murmelchen sichtbar, Helligkeitsunterschied schätzungsweise 1.5 Magnituden
AD: nordöstlich von A in vierfachem Abstand AB ist Komponente D als schwaches Lichtpünktchen D erkennbar
AE: Komponente E zeigt sich westlich von Komponente A in drei- bis vierfacher Entfernung wie AB, schwach
René Merting
Drachhausen (Germany)
100mm (32x) AB: Komponente B zeigt sich mehr als knapp getrennt nördlich von A - Komponente A ist doppelt so hell wie B
AD: Komponente D ist mir nordöstlich in vierfachem Abstand AB auch noch aufgefallen und ich konnte drei bis vier weitere schwache Sterne erkennen, sicherlich alles weitere Komponenten dieses Mehrfachsystems
COU772 9m.0 9m.2 0.3" 75° 2011 Gem 07h47m07.07s / +18°47'19.20"
Mark McCarthy
Fremont (California/USA)
508mm (667x) A most excellent, barest hairline split of white stars with significant magnitude. Suspected with 333x, needed 667x for a clean view. Very nice
HO36 9m.8 9m.9 0.6" 306° 2012 Gem 07h47m34.74s / +25°28'08.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Very finely split blue-white stars, very slight mag difference. Pretty tough
AGC2 7m.8 9m.7 1.0" 116° 1991 Gem 07h47m58.47s / +28°40'02.70"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Light orange-yellow A, B is very fine, almost 3 delta mag, nearly 1", very nice pair
STF1140 7m.0 8m.7 6.4" 273° 2016 Gem 07h48m22.61s / +18°20'12.40"
Robert Zebahl
Leipzig (Germany)
70mm (44x) Easy to separate with quite clear difference in brightness.
Mark McCarthy
Fremont (California/USA)
508mm (205x) Easy pair, light orange A and light blue B, 1 delta mag, wide ~8"
WRH15, 82 Gem AB 6m.8 7m.3 0.3" 28° 2016 Gem 07h48m33.65s / +23°08'27.50"

../images/binary-star-orbits/WRH15-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 82 Gem. I see an elongated misshape, PA to the NNE, but not firm. Physical with a 580-year period. R.H. Wilson
STTA88 AB 7m.5 8m.9 57.1" 2016 CMi 07h48m58.22s / +00°39'42.90"
AC 7m.5 10m.8 95.8" 51° 2015
René Merting
Drachhausen (Germany)
18x70 AB: ein einfacher Fernglas-Doppelstern - beide Komponenten sind gut sichtbar, weit getrennt voneinander - Komponente B im Norden ist gut 1.5 Magnituden schwächer - leichter Farbkontrast
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x ein mehr als bequem getrenntes Paar - Komponente B im Norden ist halb so hell wie A - zurück auf 20x weiterhin eine ordentliche Trennung
STF1144 AB 7m.9 10m.3 8.4" 358° 2018 Gem 07h49m00.84s / +28°34'26.40"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Fine pair, Bis a nice sharp hard point, very much fainter than yellowish A, widely separated ~8"
STF1149 7m.8 9m.2 21.7" 41° 2017 CMi 07h49m29.79s / +03°13'15.60"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x zeigt sich Komponente B gut getrennt nordöstlich von A - Helligkeitsunterschied 1.5 Magnituden
STF1147 9m.7 9m.7 2.2" 175° 2019 Gem 07h50m19.69s / +24°31'55.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Nice near equal blue-white stars, wide ~2.5" [not physical, surprisingly]
COU926 9m.5 9m.7 0.3" 254° 2008 Gem 07h50m38.16s / +19°44'04.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Very tentative notched, noticable mag difference, only with seeing. Can't go to higher mag due to seeing
★★★ STTA89 6m.8 7m.7 76.6" 84° 2017 Gem 07h51m00.20s / +31°36'48.70"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Clearly split. Primary distinctly brighter. Rather charming in 8.6° FOV together with Castor and Pollux, with which it forms an almost equilateral triangle.
A physical double at a distance to us of 660 light years.
Christopher Hay
Seeheim (Germany)
20x60 Handheld in reclining chair, binoculars with internal stabilisation. A charming wide pair with a subtle blue/orange colour contrast.
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x widely separated with moderate difference in brightness. The primary component appeared whitish, at 44x rather white-yellowish. The companion appeared slightly orange.
BU101, 9 Pup 5m.6 6m.5 0.4" 307° 2019 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]
AG144 AB 9m.7 11m.1 11.6" 339° 2017 Gem 07h51m54.12s / +22°15'26.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Wide white stars, significant delta mag, B brightens with averted vision. Not physical
COU928 9m.2 9m.7 5.6" 99° 2019 Gem 07h52m40.85s / +20°02'37.70"
Mark McCarthy
Fremont (California/USA)
508mm (533x) A is a light yellow-orange, easily 1 delta mag brighter than blue B. Wide, ~10"
STT182 7m.8 7m.9 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) Very close, ~1", near equal brightness white.
WEI17 9m.0 9m.3 7.0" 96° 2017 Gem 07h54m02.88s / +14°56'54.10"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Dual ninth mag pair, white, slight mag difference, very wide
COU951 9m.9 10m.7 3.1" 134° 2017 Gem 07h54m13.96s / +27°53'02.40"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Difficult given poor seeing and transparency this night. A is considerably more bright about half delta than B, white stars, split
A2536 10m.4 10m.6 1.0" 307° 2016 Gem 07h54m36.67s / +25°12'48.40"
Mark McCarthy
Fremont (California/USA)
178mm (333x) Very significant delta mag, very close, it's an elongated haze until seeing settles then can I can resolve and split the faint B from white A
ES422 8m.4 10m.8 15.2" 183° 2017 Gem 07h55m27.26s / +29°09'30.70"
Mark McCarthy
Fremont (California/USA)
203mm (205x) B revealed with averted vision only, clearly seen with averted vision with yellowish A, pretty wide
STF1158 AB 9m.3 9m.3 7.3" 333° 2017 Gem 07h56m31.40s / +21°52'28.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Dim for a Struve, wide, one delta mag. Not physical
STT185 7m.1 7m.3 0.4" 22° 2020 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
STF1162 8m.0 10m.2 9.0" 327° 2015 Cnc 07h57m22.66s / +13°12'24.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange and blue, pretty wide.
Karsten Kopp
Köln (Germany)
600mm (135x) Einfacher Doppelstern mit klarem Helligkeitsunterschied, wobei Komponente A leicht gelblich leuchtet.
STF1167 9m.8 11m.8 12.1" 229° 2017 Cnc 07h58m34.29s / +16°28'09.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint pair, B seen with averted vision and seeing. 2 delta mag, near a bright star.
Karsten Kopp
Köln (Germany)
600mm (135x) Einfach zu trennder Doppelstern mit klarem Helligkeitsunterschied.
STF1161 8m.2 9m.8 2.9" 198° 2019 Lyn 07h59m40.77s / +46°37'12.20"
Mark McCarthy
Fremont (California/USA)
178mm (148x) White and light orange stars, 1 delta mag, well split
STF1170 8m.7 9m.1 2.4" 108° 2019 Cnc 07h59m45.52s / +13°41'19.90"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Lovely close split, white stars, near equal
Mark McCarthy
Fremont (California/USA)
317mm (553x) Close near equal pair, 2".
Karsten Kopp
Köln (Germany)
600mm (180x) Noch gut zu trennender Doppelstern mit nur leichtem Helligkeitsunterschied. Der hellere Stern geht leicht ins gelbliche.
A2954 AB 8m.4 9m.0 0.6" 338° 2016 Cnc 08h00m27.88s / +09°54'49.00"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Hairline split with seeing, significant magnitude difference, white stars
STF1171 6m.5 9m.9 2.1" 326° 2016 Cnc 08h01m00.78s / +23°34'59.20"
René Merting
Drachhausen (Germany)
100mm (213x) bei 142x schmiegt sich Komponente B an der Grenze zur Sichtbarkeit im Süden von Komponente A ganz dicht an den viel größeren Bruder, der ohne Beugungsringe auskommt - bei 213x zeigt sich B leicht abgesetzt von A
Robert Zebahl
Leipzig (Germany)
102mm (187x) Observation from the city at half moon. At magnifications between 187x and 280x I could see the very dim companion almost permanently near the first diffraction ring. But the diffraction ring itself was hardly visible. Main problem here was probably the low brightness of the companion.
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig. Zu ahnen bei 144x ../projects/double-stars/uwe-pilz/sketches/200303stf1171.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very tough for a Struve. B is very faint and comes to view only with seeing as a very fine point, pretty well separated from A, but A needs to be a disk for B to resolve out of the diffraction. Seen fleetingly, somewhat better with averted vision but averted vision often misses moments of best seeing. Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange, 4 delta mag! very faint and close B
STF1173 AB 8m.5 9m.9 10.5" 50° 2017 Cnc 08h01m23.12s / +16°56'58.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Wide and pretty faint for a Struve, white stars. Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide, pretty faint
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern.
SHJ86 AB 6m.2 7m.5 51.6" 81° 2019 Cam 08h02m30.82s / +63°05'25.20"
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x weit getrennt - Komponente A ist samtgelb, B strahlt weiß - trotzdem beide Sterne weit auseinander stehen, sind sie als Sternpaar erkennbar, weil die Sterne im unmittelbaren Umfeld allesamt schwächer sind
HO349 AB 7m.7 12m.0 10.3" 227° 2015 Cnc 08h02m32.77s / +12°27'08.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange star and extremely faint B star, a fuzz at the edge of visibility in the correct position angle, ~10" separation
Karsten Kopp
Köln (Germany)
600mm (257x) Doppelstern konnte gerade noch gut getrennt werden, wobei hier der Helligkeitsunterschied von 4,5 mag bzw. der schwächere Stern, welcher an der Wahrnehmungsgrenze liegt, die Herausforderung darstellen.
ES291 8m.6 11m.8 6.4" 348° 2017 Gem 08h02m44.02s / +32°11'09.10"
Mark McCarthy
Fremont (California/USA)
203mm (205x) B seen with averted vision only, but flashed out clearly. Wide, ~7"
STT186 7m.7 7m.9 1.1" 75° 2019 Cnc 08h03m18.52s / +26°16'03.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Beautiful hairline split, white stars, around 1 delta mag and 1". Great pair
Mark McCarthy
Fremont (California/USA)
317mm (553x) Close, 1" but easy split, near equal dull white color.
HO350 6m.8 10m.8 7.6" 160° 2015 Cnc 08h03m28.73s / +12°10'52.60"
Mark McCarthy
Fremont (California/USA)
178mm (222x) B is pretty faint and wide
BU581 AB 8m.5 8m.8 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)
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"]
STF1172 7m.9 9m.6 1.7" 244° 2017 Lyn 08h04m36.98s / +54°44'46.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Very pretty, finely split white stars, 2 delta mag, about 2" separated
AG337 9m.9 10m.2 2.7" 104° 2016 Gem 08h05m05.60s / +28°27'22.50"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Split, very close near equal orange-yellow stars
STF1182 7m.5 8m.8 4.9" 75° 2019 CMi 08h05m24.43s / +05°49'38.90"
Mark McCarthy
Fremont (California/USA)
203mm (333x) A white, B a little ruddy, wide, 2 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (553x) White and reddish, 1 delta mag, PA due east.
STF1181 8m.3 9m.3 5.2" 141° 2019 Cnc 08h05m24.56s / +08°11'58.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange and blue, 3 delta mag, wide separation.
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern, mit gut erkennbaren Helligkeitsunterschied von über 1 mag. Der hellere Stern leuchtet gelblich orange und der schwächere leicht bläulich.
★★ STF1177, 17 Cnc 6m.7 7m.4 3.5" 350° 2019 Cnc 08h05m37.06s / +27°31'46.90"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Easy to separate, but still relatively close together. Well visible difference in brightness. Color of the components was not clearly visible. Nice view overall.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x sehe ich ein knapp getrenntes schön eng stehendes Pärchen - Komponente B im Norden ist eine dreiviertel Größenklasse schwächer - das Weiß von A wirkt kühler - zurück auf 64x sehe ich eine Ameise mit dünnem Hals, in ruhigen Momenten zeigen sich beide Sterne sogar getrennt
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/200303stf1177.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) Blau und Orange - sehr schöner Farbkontrast, unterstützt durch die ähnliche Helligkeit ../projects/double-stars/uwe-pilz/sketches/210330STF1177.jpg
Christopher Hay
Seeheim (Germany)
125mm (160x) Well split despite substantial turbulence in the atmosphere. Main component creamy yellow-white, companion pale blue. A very attractive colour contrast warranting a one-star rating.
Mark McCarthy
Fremont (California/USA)
178mm (205x) Excellent, around 1 delta mag and wide, blue-white stars, nicely resolved
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF1177.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellowish, 1 delta mag, ~4"
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern, mit gut erkennbaren Helligkeitsunterschied . Der hellere Stern leuchter weiß-gelblich, während der schwächere leicht bläulich schimmert. Schöner Farbkontrast
WFC61 8m.4 9m.5 10.5" 34° 2015 Cnc 08h06m07.62s / +14°15'01.60"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Nice wide 1 delta mag white stars. Physical
STF1186 7m.1 10m.1 3.3" 212° 2018 Cnc 08h08m49.61s / +27°28'49.40"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Really nice, very large delta mag of about 3, about 3", white stars, large round disk for the A star and tiny point for B
Mark McCarthy
Fremont (California/USA)
317mm (553x) 11 Cnc: Orange with very faint B, ~3"
Karsten Kopp
Köln (Germany)
600mm (180x) Noch gut zu trennender Doppelstern, wobei hier der Helligkeitsunterschied von ca. 3 mag und der Abstand von 3,1" der hellere Stern den schwächeren fast zu überstrahlen droht. Komponente A leuchtet gelblich orange.
STF1188 8m.7 9m.3 16.4" 201° 2020 Cnc 08h09m23.95s / +30°20'49.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide separation, near equal white.
Karsten Kopp
Köln (Germany)
600mm (180x) Leicht zu trennender Doppelstern mit leichtem Helligkeitsunterschied von vielleicht 0,5 mag.
STF1187 AB 7m.2 8m.0 3.1" 21° 2020 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)
178mm (205x) White stars, a little more than 1 delta mag, wide about 4". Physical with a 1385.156-year period
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange, 1 delta mag, 5"
Karsten Kopp
Köln (Germany)
600mm (180x) Noch gut zu trennender Doppelstern mit leichtem Helligkeitsunterschied. Komponente A leuchtet gelblich weiß und Komponente B gelb.
A1335 AB 7m.6 10m.8 1.4" 243° 2016 Lyn 08h10m12.57s / +55°48'15.50"
Mark McCarthy
Fremont (California/USA)
178mm (222x) Very delicate B next to bright A, 1". B is just a tiny fleck, best at lower powers so a glare doesn't overpower it. Physical
BUP111 AB 6m.6 9m.3 80.9" 49° 2016 Cnc 08h10m13.10s / +25°50'40.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 13 Cnc. Wide separation, orange A.
STF1191 10m.3 10m.8 3.6" 77° 2016 Cnc 08h10m47.59s / +19°01'51.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint but well split, ~3", near equal pair
Karsten Kopp
Köln (Germany)
600mm (180x) Noch gut zu trennender Doppelstern, mit leichtem Helligkeitsunterschied.
HJ777 AB 9m.6 11m.7 10.6" 349° 2016 Cnc 08h11m29.33s / +10°41'05.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very wide, faint
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern einfach zu trennen, wobei der Helligkeistunterschied schon recht groß und Komponente B recht schwach ist.
★★★ zeta Cnc, 16 Cnc STF1196 AB 5m.3 6m.2 1.2" 2020 Cnc 08h12m12.79s / +17°38'51.20"
STF1196 AB-C 4m.9 5m.8 6.0" 64° 2020
STF1196 AC 5m.3 5m.8 6.2" 62° 2020
HUT1 Ca-Cb 6m.2 7m.1 0.3" 2020

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1196.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) AB-C: Finely split. AB yellowish. Substantial delta-mag.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB-C: Easy to separate. A: light grey, B: pale orange.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C clearly split, AB obviously elongated but not split
Uwe Pilz
Leipzig (Germany)
105mm (288x) weißblau-gelb-gelb ../projects/double-stars/uwe-pilz/sketches/zetaCnc.jpg
Robert Zebahl
Leipzig (Germany)
120mm (67x) AB-C: Evident difference in brightness, easy to split. Both components of similar color.
Robert Zebahl
Leipzig (Germany)
120mm (200x) AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star! ../projects/double-stars/robert-zebahl/sketches/2019-02-24_stf1196.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: Sehr schön, 3-fach Stern, A = weißgelb, B = weißgelb, C = weißgelb ../projects/double-stars/winfried-kraeling/sketches/180408_02_Zeta%20Cnc.jpg
Sarah Gebauer
Germany
150mm (83x) AB-C: bei 83x sind AB-C sauber getrennt, laut Atlas 2020 6,1'' Abstand, die Komponenten A und B mit 1,1'' lassen sich nicht trennen, viele schöne Feldsterne dabei ../projects/double-stars/sarah-gebauer/sketches/20200411%20Zeta%20Cnc%20DSk.jpg
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Hair-fine split. A and B both yellowish-white. C wide from AB, bluish-white, nice colour contrast to AB.
Frederik Wanink
Itterbeck (Germany)
254mm (200x) AB-C: AB (1,1") nicht bemerkt ../projects/double-stars/frederik-wanink/sketches/STF1196.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Ca-Cb: not quite round, oval/olive shaped. It is the AB-C of STF 1196.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Triple, all near equal magnitude, yellow-white. AB ~0.8", hair split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Triple, all near equal magnitude, yellow-white. AC ~6", wide split.
Karsten Kopp
Köln (Germany)
600mm (257x) AB: Die Komponenten AB-C bei etwas größerem Helligkeitsunterschied einfach zu trennen und auch schön anzusehen. Sterne erstrahlen weißlich gelb. Komponente AB war nicht zu trennen.
STF1195 AB 9m.3 11m.8 9.2" 333° 2015 Cnc 08h12m38.45s / +30°27'33.30"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Both stars are faint, B seen well because it's widely separated about 8", about 2 delta mag. Physical
STF1197 9m.0 9m.7 1.8" 101° 2019 Cnc 08h12m44.45s / +29°32'30.90"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Fine pair of white stars, around 2" and 1 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint pair, 1 delta mag, ~2".
Karsten Kopp
Köln (Germany)
600mm (257x) Doppelstern konnte mit nur 1,8" Abstand gerade so getrennt werden. Helligkeitsunterschied etwas mehr als 0,5 mag.
STF1201 8m.1 9m.5 6.7" 184° 2021 Cnc 08h12m52.51s / +09°34'40.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Pretty pair, almost two delta mag. Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty wide, 5", 1 delta mag.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern einfach zu trennen, mit größerem Helligkeitsunterschied weit über 1,0 mag. Der hellere Stern leuchtet gelblich weiß.
STF1202 7m.4 9m.6 2.7" 305° 2016 Cnc 08h13m34.20s / +10°50'49.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice yellow-orange and 3 delta mag, B, same color, ~5-7"
Karsten Kopp
Köln (Germany)
600mm (257x) Dieser Doppelstern war aufgrund des größeren Helligkeitsunterschieds und mit einem Abstand von 2,7" gar nicht mal so einfach zu beobachten.
BU1243 AB 6m.4 12m.3 1.7" 329° 2016 Cnc 08h14m11.14s / +17°40'33.30"
Mark McCarthy
Fremont (California/USA)
178mm (410x) B appears as a tiny point just outside A's main diffraction ring, it clears with seeing but is still visible in shimmer during poorer moments
STT189 6m.9 10m.7 4.7" 298° 2019 Lyn 08h14m49.01s / +43°02'05.90"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-04-14: Not even partially separated.
LEP30 7m.7 9m.8 31.8" 238° 2016 Cnc 08h15m33.20s / +11°25'51.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange with faint white star of ~11th magnitude, wide separation
Karsten Kopp
Köln (Germany)
600mm (180x) Einfacher Doppelstern mit größerem Helligkeitsunterschied. Komponente A leuchtet gelblich.
STF1210 AB 7m.2 9m.4 15.7" 113° 2019 Hya 08h15m48.54s / +02°48'05.00"
René Merting
Drachhausen (Germany)
18x70 mit etwas Konzentration ploppt südöstlich von A ein kleiner schwacher Lichtpunkt auf, der nicht richtig klar zu sehen ist - in ruhigen Momenten Trennung sichtbar - Komponente B ist mindestens 2 Größenklassen schwächer
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty wide greenish yellow pair, wide separation, 2 delta mag.
ES593 AB 9m.3 10m.9 20.9" 345° 2019 Lyn 08h16m42.64s / +40°53'13.90"
AC 9m.3 11m.3 17.8" 334° 2017
BC 9m.9 10m.1 4.7" 211° 2020
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-14: At 100x and 133x, the pair AB is easy to separate, whereas B appeared pretty faint. On closer look the pair BC appeared slightly elongated.
STF1212 8m.6 10m.1 5.5" 241° 2019 Cnc 08h18m03.47s / +30°49'56.00"
Mark McCarthy
Fremont (California/USA)
178mm (205x) 1 delta mag, fairly well split, nothing special but still a pretty pair. Not physical
STF1193 AB 6m.2 9m.7 42.4" 90° 2015 UMa 08h20m40.32s / +72°24'26.00"
BC 9m.8 12m.7 58.8" 2015
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-21: Beautifully separated with much fainter companion. The primary component shines in a bright, refreshing yellow. Rewarding!
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x … oh wow, was für eine Farbe bei Komponente A - so ein intensives Gelb habe ich noch nirgends gesehen, gleißendes Rapsgelb - die deutlich schwächere Komponente B im Osten in weitem Abstand ist bei der Farbe von A eher uninteressant, B ist ohnehin nur grau schimmernd
STF1219 9m.2 9m.3 12.2" 82° 2020 Cnc 08h22m58.53s / +07°37'49.60"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Near equal wide white stars. Physical
A2961, 21 Cnc 6m.3 9m.4 1.3" 267° 2019 Cnc 08h23m55.20s / +10°37'55.40"
Mark McCarthy
Fremont (California/USA)
178mm (205x) A is a light orange star, B is a very exceptionally fine point just a little more than 1" separation, sharp with seeing, 3 delta mag.
A1746, 24 Cnc BC 8m.5 8m.5 0.2" 2007 Cnc 08h26m39.82s / +24°32'03.70"

../images/binary-star-orbits/A1746-BC-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Component of STF1224. I see a very subtle notched elongation, PA SSW, noticeable mag difference. Physical with a 21.78-year period, it is a nearly circular orbit and near periastron, it's apastron will be in 2029 at 0.16"
★★ STF1224, 24 Cnc A-BC 6m.9 7m.5 5.7" 53° 2019 Cnc 08h26m39.82s / +24°32'03.70"
Uwe Pilz
Leipzig (Germany)
105mm (128x) fahlviolett und gelb ../projects/double-stars/uwe-pilz/sketches/210330STF1224.jpg
★★ STF1223, phi 2 Cnc 6m.2 6m.2 5.2" 219° 2019 Cnc 08h26m47.08s / +26°56'07.80"
Christopher Hay
Seeheim (Germany)
25x80 Hair-fine, but definite and constantly held split. Charming in 3.3° FOV with Phi1 and Chi Cnc.
Easier than I would have thought at only 25x. This is clearly aided by the very well-matched brightnesses of the components. The 70% full moon nearby in Leo also helps, as its brightness boosts the eyes' acuity. During the observation I gaze intentionally directly into the moon at intervals in order to utilise this effect, a technique honed in earlier binocular observations of planets.
Primary is slightly brighter than the secondary, again surprising considering that delta-mag is only 0m05 (6m16 to 6m21 according to Stelledoppie). Not a physical pair, alas, although it looks so much like one.
Christopher Hay
Seeheim (Germany)
36mm (33x) Hairfine split at 33x, clearer at 40x, quite clear at 50x.
Uwe Pilz
Leipzig (Germany)
105mm (28x) weiß und gelb ../projects/double-stars/uwe-pilz/sketches/210330Phi2Cnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schön, blauweiß-gelbweiß ../projects/double-stars/uwe-pilz/sketches/stf1223.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) Bright white, equal, wide -- dramatic but not much. Not physical
Karsten Kopp
Köln (Germany)
600mm (180x) Schöner und einfach zu trennender Doppelstern, wo beide Sterne dieselbe Helligkeit haben und weißlich strahlen. Wie ein Augenpaar im All
HU714 Ba-Bb 9m.8 10m.1 0.8" 313° 2012 Cnc 08h26m56.47s / +32°11'47.30"

../images/binary-star-orbits/HU714-Ba-Bb-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Nicely split with seeing, 0.5-1.0 delta mag, 0.5" separation. Short period of 195.5 years, it is at apastron now and will remain there the rest of my lifetime
STF1228 8m.9 9m.7 8.8" 352° 2020 Cnc 08h27m39.04s / +27°33'42.50"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Bright white, 1 delta, wide
STF1230 9m.3 10m.6 33.8" 186° 2017 Cnc 08h28m25.95s / +16°51'09.10"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Komponente B nur indirekt. bei 88x erahnbar. ../projects/double-stars/uwe-pilz/sketches/200323STF1230.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Einfacher Doppelstern mit größerem Helligkeitsunterschied.
A551, LO Hya AB 7m.0 7m.1 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]
A2893 9m.8 9m.4 0.7" 352° 2016 Hya 08h30m05.67s / +05°13'03.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Closely split, noticeable ~1 delta mag, good pair
HU717 9m.7 9m.5 0.5" 52° 2011 Cnc 08h32m34.65s / +32°27'25.10"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Exceptionally finely split with 333x, steady clean split with 533x, near equal white stars
STF1243 7m.8 9m.4 1.7" 233° 2017 Hya 08h33m53.79s / +01°35'07.50"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Well split ~2", 2 delta mag, blue-white A and dull white B
★★ STF1245 AB 6m.0 7m.2 10.1" 25° 2020 Cnc 08h35m51.05s / +06°37'13.90"
AC 6m.0 10m.7 99.8" 109° 2020
AD 6m.0 11m.9 109.1" 292° 2020
AE 6m.0 9m.6 113.2" 207° 2020
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB at 22x separated, but very close, uneven pair. A appeared white-yellowish, B orange, partly reddish. Opposite in a wide separation the fainter component E was visible. At 57x, A appeared white-yellowish, B orange. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1245.jpg
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein sehr enges Pärchen, gerade so getrennt - das Sternpaar ist heller, als viele andere Sterne in der unmittelbaren Umgebung, dadurch ist es sehr auffällig - Komponente A strahlt reinweiß, B steht dem in nichts nach, auch wenn die Komponente gut eine Magnitude schwächer ist
Sarah Gebauer
Germany
100mm (45x) AB: schmal, aber deutlich getrennt, die südliche Komponente sichtbar heller, die nordöstliche schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB ../projects/double-stars/uwe-pilz/sketches/200323STF1245.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB: Wide and bright pair, light yellow and orange, easy, slight mag difference
Karsten Kopp
Köln (Germany)
600mm (180x) AB: AB: Schöner und einfacher Doppelstern, wobei die Komponente A weißlich gelb und Komponente B gelblich orange leuchtet. Das Sternfeld in direkter Umgebung rundet den schönen Eindruck ab.
STF1242 9m.9 10m.5 2.7" 175° 2016 UMa 08h36m01.43s / +47°07'29.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Dim pair for Struve, half delta mag, well split about 4"
STTA94 7m.4 8m.1 43.2" 133° 2018 Cnc 08h36m10.95s / +13°46'39.20"
Robert Zebahl
Leipzig (Germany)
16x70 2022-03-02: Isolated double star with moderate separation and difference in brightness. The primary component appears white-yellowish, the color of the companion is not clearly visible.
AG154 9m.6 9m.8 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
S570 AB 7m.5 9m.6 57.3" 84° 2015 Cnc 08h39m06.10s / +19°40'36.50"
AC 7m.5 9m.3 178.6" 345° 2015

Located in Messier 44.

Robert Zebahl
Leipzig (Germany)
16x70 AB: 2022-03-02: Medium bright, widely separated with clear difference in brightness. I did not pay attention to the northern, more distant and brighter component C.
J1008 10m.9 11m.1 3.1" 20° 2016 Hya 08h39m23.43s / -00°16'32.00"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Easy pair, not too faint, wide ~3", equal mag. [not physical]
COU47 7m.9 9m.6 0.6" 141° 2008 Cnc 08h39m42.78s / +20°05'10.40"
Mark McCarthy
Fremont (California/USA)
178mm (410x) Elongated at lower magnifications, strongly notched at 410x, noticeable magnitude difference. Same proper motions so likely physical
STF1255 AB 7m.3 8m.6 26.1" 30° 2020 Hya 08h39m43.80s / +05°45'51.40"
BC 8m.6 13m.6 69.6" 357° 2015
BD 8m.6 12m.6 71.5" 22° 2015
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x und 32x ein ordentlich getrenntes Sternpaar - Komponente B im NW strahlt nicht ganz so weiß wie A - Helligkeitsunterschied eine halbe Größenklasse (1.23 mag laut Stelle Doppie!)
S571 AD 7m.3 6m.7 92.1" 242° 2018 Cnc 08h39m56.49s / +19°33'10.70"
AG 7m.3 7m.5 45.7" 158° 2018

Located in Messier 44. This multiple system also includes the double stars BU584 and CHR156. The brightest component is D.

Robert Zebahl
Leipzig (Germany)
16x70 AG: 2022-03-02: Wide pair. The northern component A is little brighter and appears slightly orange, the southern component G slightly bluish. I did not pay attention to the brightest component D to the west.
BU584 AB 7m.3 12m.3 0.9" 290° 2006 Cnc 08h39m56.49s / +19°33'10.70"
Mark McCarthy
Fremont (California/USA)
178mm (410x) I can't believe I got this, very faint B about 1" separation, can just see it direct vision, brightens with averted, very faint. This star the faintest of a prominent long triangle of stars. Component of S 571, which has several other widely separated pairs. In Praesepe, but I neglected to check my finderscope
ENG37 & SLE335 & SLE685, 39/40 Cnc ENG37 AB 6m.5 6m.6 151.8" 150° 2015 Cnc 08h40m06.44s / +20°00'28.10"
ENG37 AC 6m.5 9m.0 134.0" 309° 2015
ENG37 AD 6m.5 8m.8 134.9" 111° 2015
SLE685 AR 6m.5 11m.6 290.3" 150° 2001
SLE335 AS 6m.5 10m.1 261.7" 325° 2002
SLE335 CS 9m.0 10m.1 137.1" 340° 2002
Christopher Hay
Seeheim (Germany)
71mm (32x) All members A, B, C and D clearly seen and widely separated. A compact group at the northern fringe of M 44 (Praesepe, the Beehive). Component A seems orangish.
Engelmann 37ABCD is a physical group at a distance to us of 608 light years.
Stelledoppie notes about the ENG designation: Some time after publication of the IDS, the designation for Engelmann was changed from EN to ENG and that for Engelhardt from ENG to ENH. This has led to considerable confusion between the two.
STN61 8m.4 9m.4 4.6" 203° 2015 Pyx 08h40m17.61s / -32°09'54.90"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Near planetary nebula M3-6. Pretty blue and orange pair, close but well split
★★ STF1254 AB 6m.4 10m.4 20.8" 55° 2017 Cnc 08h40m22.11s / +19°40'11.90"
AC 6m.5 7m.6 62.5" 343° 2018
AD 6m.5 9m.2 83.5" 44° 2017
Stefan Loibl
Rosenheim (Germany)
102mm (164x) septuple, visual quintuple, components A, B, C, and D split, E not visible, B not split, no colour contrast, at northern edge of Messier 44 (Praesepe)
KU32 8m.1 10m.2 2.2" 165° 2017 Cnc 08h41m18.40s / +19°15'39.60"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Very fine, wow quite amazing, around 2", split nicely, 3 delta magnitude. The faint B star disappears with increased magnification
STF1262 8m.5 10m.1 6.9" 203° 2017 Cnc 08h41m58.04s / +23°47'56.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Well split, a bit less than 2 delta mag, white stars
J1110 9m.9 10m.2 3.4" 42° 2017 Cnc 08h42m06.27s / +25°00'43.40"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Well split white stars, about 1 delta. Physical
BAL1852 11m.0 11m.0 14.3" 2015 Hya 08h42m37.69s / +02°14'25.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Not likely to be physical. Wide, half delta mag white stars [not physical]
STF1258 7m.7 7m.9 10.1" 331° 2019 UMa 08h43m25.41s / +48°51'41.90"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-05: Immediately visible as a double star, separated but pretty close with similar bright components.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Easy to separate at 22x, similarly bright components at moderate distance. At 57x very small difference in brightness noticeable. The components appeared slightly orange and white-bluish, with the color changing from one component to another. A very strange effect, which I observed several times.
Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, wide, near equal. Physical
BAL2821 12m.6 13m.1 10.0" 83° 2016 Hya 08h43m26.88s / +03°40'13.00"
Mark McCarthy
Fremont (California/USA)
508mm (533x) A bit faint pair, half delta mag, wide [not physical]
STF1270 6m.9 7m.5 4.7" 265° 2020 Hya 08h45m20.79s / -02°36'03.70"
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x hatte ich schon den richtigen Verdacht, bei 64x ist es eindeutig, beide Sterne stehen knapp getrennt schön eng zusammen - Komponente A im Osten wirkt cremeweiß, B eher weißblau
Uwe Pilz
Leipzig (Germany)
120mm (94x) ../projects/double-stars/uwe-pilz/sketches/220323STF1270.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) MX Hya. Wide, yellow-white, half delta mag. Nice
CBL32 7m.4 10m.7 41.0" 174° 2015 Cnc 08h46m14.32s / +27°35'41.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow-orange 8th magnitude primary, with 3x fainter blue which can be seen direct vision but blinks like a planetary nebula, so must be 11-12th mag. Wide separation.
★★ STF1268, iota Cnc, 48 Cnc 4m.1 6m.0 31.3" 307° 2020 Cnc 08h46m41.82s / +28°45'35.60"
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld. Secondary a pinprick of light directly next to the overpowering primary. Slightly uncertain, but PA as seen confirmed afterwards in database. In stabilised 15x45 binoculars the pair is well split, primary white tending towards yellow, secondary substantially colder.
A physical double at a distance to us of 331 light years.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Well split. Primary very pale yellow, secondary very pale blue. A most striking pair.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-bluish.
Christopher Hay
Seeheim (Germany)
71mm (32x) Compact pair. Yellow, pale blue. Totally dominates 2.2° FOV.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Grand sight! Pretty wide apart and unequal. A: mild orange, B: very nice light blue.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) wide pair with nice colour contrast yellow/blue
Uwe Pilz
Leipzig (Germany)
105mm (28x) fahlblau und gelborange ../projects/double-stars/uwe-pilz/sketches/210330iotaCnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb-blaugrau ../projects/double-stars/uwe-pilz/sketches/iotaCnc.jpg
Sarah Gebauer
Germany
150mm (125x) bei 83x schon deutlich getrennt, der Farbkontrast ist gut zu sehen, er wird bei 125x noch stärker, ein zartes Blau und Gelb sind zu sehen ../projects/double-stars/sarah-gebauer/sketches/20200411%20i%20Cnc%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Iot Cnc: Pretty orange and pale blue, showpiece object.
★★★ 11 Hya, epsilon Hya SP1 AB 3m.5 5m.0 0.2" 241° 2018 Hya 08h46m46.51s / +06°25'07.70"
STF1273 AB-C 3m.5 6m.7 2.9" 311° 2020
STF1273 AB-D 3m.5 12m.5 18.1" 201° 2017
STF1273 AB-E 3m.5 10m.8 340.5" 2015
STF1273 AB-F 3m.5 10m.4 406.5" 265° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Sarah Gebauer
Germany
100mm (200x) AB-C: ist ein heller Stern vom Hydra-Kopf, nicht zu trennen, vermutlich, weil die Komponente AB zu hell strahlt
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB-C: bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB-C: Epsilon Hya A is bright orange-yellow, B is much fainter and a little blue, ~3". [SP 1 AB is 3.49/5.00 0.2" not seen]
KR30 10m.3 10m.3 1.9" 305° 2016 UMa 08h46m49.82s / +57°41'55.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Finely split equal white stars, need to wait for seeing to settle for the elongation to resolve to points, about 2", small scale
STF1276 AB 8m.3 8m.6 12.7" 353° 2017 Cnc 08h47m10.99s / +11°09'34.20"
Robert Zebahl
Leipzig (Germany)
16x70 2022-03-02: Pretty tight, medium bright double star with small difference in brightness.
Sarah Gebauer
Germany
100mm (45x) das enge Pärchen bei 45x ist deutlich getrennt, die dritte Komponente landete unwissenderweise sogar auch auf der Zeichnung ../projects/double-stars/sarah-gebauer/sketches/STF1276.jpg
Mark McCarthy
Fremont (California/USA)
178mm (148x) Wide, white, near equal stars, nice
STF1281 AB 7m.8 9m.0 53.1" 310° 2017 Hya 08h47m36.90s / +00°01'04.30"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein weit auseinander stehendes Paar - Komponente B im NW ist halb so hell und wirkt gräulich gegenüber der buttergelben Komponente A - zurück auf 20x ist B noch nicht zu schwach und immernoch gut getrennt von A erkennbar
Uwe Pilz
Leipzig (Germany)
120mm (94x) nicht als Mehrfachstern erkennbar, eher wie drei Feldsterne ../projects/double-stars/uwe-pilz/sketches/220323STF1281.jpg
ES596 9m.6 11m.0 3.1" 207° 2015 Lyn 08h47m55.32s / +45°31'39.00"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Faint pair, nicely split, white A and dull B. Physical
BAL2347 AB 9m.3 10m.8 4.0" 204° 2015 Hya 08h47m58.80s / +03°07'39.50"
Mark McCarthy
Fremont (California/USA)
508mm (533x) B star considerably fainter needed averted vision to flash it out, but then hold it direct. Both stars a little blue, wide separation, half delta mag
BU335 7m.5 9m.4 2.6" 265° 2017 Hya 08h48m12.24s / +02°34'48.40"
Sarah Gebauer
Germany
100mm (200x) auch bei 200x nicht zu trennen
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig ../projects/double-stars/uwe-pilz/sketches/200323BU335.jpg
Uwe Pilz
Leipzig (Germany)
120mm (250x) ../projects/double-stars/uwe-pilz/sketches/220323BU335.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) 3 delta mag, well split ~3", very pleasing pair, white A and slightly red B
STT194 7m.4 10m.5 12.6" 57° 2015 Hya 08h48m18.30s / +00°33'18.10"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Orange A and blue B, 3 delta mag, very wide [not physical]
AGC3, rho Hya 4m.4 11m.9 12.1" 146° 2016 Hya 08h48m25.98s / +05°50'16.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Rho Hya Bright white A star and much fainter B star, but it's still a hard bluish point very fine. Nice one
A2550 9m.5 9m.8 0.4" 204° 1996 Hya 08h48m35.67s / +03°04'05.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow exceptionally fine pair. B is very faint but can hold direct vision after flashing it out using averted vision. Very close, hairline split, amazing pair. At 1067x the stars dim a little can still see B but need averted vision all the time
A2552 9m.1 8m.5 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]
STF1271 9m.5 10m.3 0.9" 81° 2015 UMa 08h50m07.39s / +56°12'23.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very close, barely split, around 1", more than 1 delta magnitude
J74 11m.2 11m.3 9.3" 126° 2017 Hya 08h50m23.22s / +01°24'47.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Faint near equal, bluish, pretty wide. Forms part of a triangle with similar magnitude stars [not physical]
BAL2351 9m.3 10m.6 14.2" 110° 2016 Hya 08h50m30.10s / +03°32'34.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Easy wide pair, B star is very blue. One delta mag. [not physical]
VDK3 9m.9 10m.1 1.0" 199° 2020 Cnc 08h50m42.33s / +07°51'52.40"

../images/binary-star-orbits/VDK3-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (410x) With apodising mask. A surprise short period find. Light orange stars -- they are carbon, HP Cnc. About 1 delta mag, more than 1" separation. Seeing is bloating the stars a bit, but can recorded the PA by drift, it follows a S-N line. J. Vanderdonck, who has three discoveries to his name in the WDS. Physical with a 223.9709-year period, it will make a quarter turn by 2040
STF1278 AB 8m.5 10m.5 8.5" 128° 2019 UMa 08h50m42.68s / +49°20'49.00"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White A star and two delta mag, very wide B
STF1282 AB 7m.6 7m.8 3.5" 279° 2019 Lyn 08h50m44.28s / +35°04'15.40"

../images/binary-star-orbits/STF1282-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) Clearly separated, but close together with very little difference in brightness. The double star forms an acute-angled triangle together with two other stars.
PER1 8m.3 9m.6 0.8" 350° 2017 Cnc 08h51m13.71s / +08°20'18.60"
Mark McCarthy
Fremont (California/USA)
508mm (410x) Quite a beautiful pair, light yellow stars, >1 delta mag, about 1", emerges to view with seeing, quite good. One of two J. Perrotin discoveries. Same proper motions so will likely prove to be physical
STF1275 AB 8m.7 8m.9 1.9" 198° 2019 UMa 08h51m26.19s / +57°31'38.10"
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 100x and 150x not permanently split. Components very close together.
Mark McCarthy
Fremont (California/USA)
178mm (205x) Neat near equal, nice split about 2", white
BAL2354 9m.9 11m.7 8.6" 40° 2016 Hya 08h51m27.36s / +02°55'49.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) B is quite faint, need averted vision to notice it, but then can hold direct, 3 delta mag, pretty wide, ~8" [not physical]
BU587 & H5 120, 15 Hya BU587 AB 5m.8 7m.4 1.2" 121° 2017 Hya 08h51m34.44s / -07°10'38.00"
H5 120 AB-C 5m.5 11m.4 45.6" 2015
BU587 AB-D 5m.5 12m.1 55.5" 56° 2015
Uwe Pilz
Leipzig (Germany)
120mm (360x) 94x & 360x ../projects/double-stars/uwe-pilz/sketches/220323_15Hya.jpg
STF1290 7m.4 9m.2 2.8" 325° 2017 Hya 08h52m03.40s / +04°27'58.00"
Sarah Gebauer
Germany
100mm (200x) blickweise, aber nicht zuverlässig getrennt
Mark McCarthy
Fremont (California/USA)
508mm (533x) White stars, wide, 2 delta mag
A2900 6m.4 9m.5 0.7" 310° 2004 Hya 08h52m24.18s / +05°20'25.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated or olive shape, not quite notched, certainly a double but difficult, in poor conditions
HJ460, 53 Cnc AB 6m.5 11m.7 43.7" 335° 2003 Cnc 08h52m28.60s / +28°15'33.00"
AC 6m.5 6m.0 276.8" 20° 2011
Christopher Hay
Seeheim (Germany)
7x45 AC: Very wide. C is cold blue, A warmer and weaker.
AC is Rho1 Cnc. C is 55 Cnc, aka Copernicus AB, home to five exoplanets, fairly close to us at a distance of only 41 light years.
Christopher Hay
Seeheim (Germany)
10x42 AC: Binoculars with internal stabilisation, handheld. C is light blue, A brownish-orange. Attractive in 6.5° FOV together with 57 and 61 Cnc and Iota Cnc less than 2° to the west, which is split.
Christopher Hay
Seeheim (Germany)
15x60 AC: On tripod. A wide matching pair. Component A (53 Cnc) seems reddish. Nice together with well-split Iota Cnc in 3.3° FOV.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 53 Cnc: Orange primary and 2x fainter blue, wide separation (this is AB). There is a second orange-yellow star of about the same magnitude very wide separation (this is AC).
A1584 9m.0 7m.7 0.6" 94° 2018 UMa 08h53m08.05s / +54°57'11.00"

../images/binary-star-orbits/A1584-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Tight white stars, seeing is not very good but can still split it. It has a noticable magnitude difference, however I need to guess which one is A. I am able to estimate PA by drifting it across the field. [My PA is in the correct line but my A and B are reversed.] 70.89-year period, it is now at apastron and will make a very small turn in its arc by 2040
A2752 9m.0 11m.0 5.1" 231° 2016 Hya 08h53m26.66s / +05°12'47.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Easy wide pair, B is 1.5 delta mag and very blue
STF1292 AB 9m.3 9m.5 6.1" 188° 2020 Hya 08h53m46.02s / -00°34'41.60"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Near equal, wide, ~6". Very faint star ~20" may be plus one [it is, UC 1728 AC, 9.32/13.42 27.8"]
STT195 AB 7m.7 8m.3 9.8" 138° 2020 Cnc 08h53m57.80s / +08°25'17.70"
Robert Zebahl
Leipzig (Germany)
70mm (80x) At 22x very nicely separated with a small difference in brightness. The components are still pretty tight. Altogether a rather dim double star. At 80x the color difference is well visible: primary component appears slightly orange, the companion pale blue.
Mark McCarthy
Fremont (California/USA)
508mm (148x) White stars, wide, one delta
STF1291, 57 Cnc AB 6m.1 6m.4 1.5" 310° 2019 Cnc 08h54m14.65s / +30°34'45.80"
AB-C 5m.5 9m.2 54.6" 204° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Immediately apparent as a double star. Diffraction disks overlapping slightly ('8'). Difference in brightness visible.
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb ../projects/double-stars/uwe-pilz/sketches/57Cnc.jpg
Sarah Gebauer
Germany
150mm (125x) AB: sowohl bei 83x als auch bei 125x knapp vorm Trennen
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 57 Cnc. Very nice pair, strong orange yellow colors, ~1 delta mag, bright, nice close split
BAL1430 10m.1 11m.0 11.5" 110° 2015 Hya 08h54m37.08s / +01°27'00.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Faint, wide, noticeable not-quite-half magnitude difference [not physical]
ARG71 10m.2 10m.4 5.3" 339° 2019 UMa 08h54m39.34s / +49°54'09.90"
Mark McCarthy
Fremont (California/USA)
508mm (205x) White and wide near equal
AG338 AB 9m.0 9m.2 2.1" 164° 2020 Cnc 08h54m41.52s / +16°36'39.70"

../images/binary-star-orbits/AG338-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (148x) IK Cnc. White stars, near equal, well split. Physical with a 1790-year period. A is TOK 196 0.2", not attempted, with just a 15-year period, need to go back!
STF1289 8m.2 8m.9 3.6" 2019 Lyn 08h54m44.33s / +43°35'04.70"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Quite faint double star, but easy to separate with a noticeable difference in brightness and close components.
Mark McCarthy
Fremont (California/USA)
178mm (148x) White stars, 1 delta mag, pretty wide
STF1280 AB 8m.8 9m.1 3.5" 359° 2020 UMa 08h55m24.82s / +70°47'39.20"
AC 8m.8 12m.4 398.4" 88° 2015
BC 9m.1 12m.4 398.5" 88° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (67x) AB: 2021-04-03: Rather faint double star with components still pretty close together and little difference in brightness.
René Merting
Drachhausen (Germany)
100mm (72x) AB: 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
ARG21, AC UMa AB 10m.0 10m.4 21.6" 106° 2019 UMa 08h55m51.01s / +64°58'21.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Two very faint stars, wide separation, ~0.5 delta mag, to south of an orange star.
STF3120 AB 8m.4 9m.0 1.4" 2017 Lyn 08h56m07.21s / +43°40'39.30"
Mark McCarthy
Fremont (California/USA)
178mm (222x) Lovely pair, barely split with 148x, better seen with 222x. A nice well split pair, more than 1 delta mag, white stars
A2968 9m.1 9m.4 1.2" 132° 2017 Cnc 08h57m06.22s / +10°45'29.10"
Mark McCarthy
Fremont (California/USA)
508mm (222x) Very fine pair of white stars, <1", split with 410x but then backed off magnification and could still split with lower
SHY204, 62/63 Cnc, omicron Cnc, omicron 1/2 Cnc 5m.2 5m.7 975.6" 17° 2016 Cnc 08h57m14.95s / +15°19'21.90"
Christopher Hay
Seeheim (Germany)
2x54 Wide apart, Omicron clearly brighter than 63 Cnc. Nice together with Praesepe (M 44) and the Head-of-the-Hydra asterism in 25° FOV.
Shaya 204, comprising Omi Cnc and 63 Cnc, is a physical double at a distance to us of 149 light years. Presumably separable naked-eye if NELM allows, the limiting factor being the 5m7 of 63 Cnc.
Christopher Hay
Seeheim (Germany)
7x45 Super-wide, but still holding together as a pair. Both are bluish-white.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. No particular gain anticipated over 7x45 view, but in fact in the tighter 3.3° FOV the pair is quite charming, the field sprinkled liberally with many fainter stars. Both components (i.e. Omi Cnc and 63 Cnc) have an identical bluish-white hue, very pretty.
STF1294 & SIN41 STF1294 AB 9m.0 10m.8 15.5" 340° 2017 Cnc 08h57m17.08s / +32°53'57.90"
SIN41 AC 9m.0 12m.6 191.3" 285° 2015
Robert Zebahl
Leipzig (Germany)
102mm (28x) STF1294 (AB): At 28x relatively widely separated and rather less striking near the bright star sigma 2 Cnc. Component A appeared slightly orange, the companion only as a dim star. Similar view at 86x.
★★ BU408 7m.3 9m.6 2.8" 345° 2018 UMa 08h59m00.62s / +63°25'42.80"
René Merting
Drachhausen (Germany)
100mm (142x) bei 107x ist nordöstlich von A ein Helligkeitspeak erkennbar, aber nicht richtig greifbar - bei 142x dann zeigt sich in ruhigen Momenten die schwächere Komponente knapp abgesetzt von A - großer Helligkeitsunterschied, mindestens 2.5 Größenklassen
Mark McCarthy
Fremont (California/USA)
178mm (205x) A fine pair, white bright A and faint B about 3", 3 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU 408 is the fainter star in a pair pair of near equal stars in finder view, red-orange color. In the scope the B is a blue star 3" out from the orange star.
iota UMa, 9 UMa, Talitha HJ2477 A-BC 3m.1 9m.2 2.4" 90° 2017 UMa 08h59m12.45s / +48°02'30.60"
HU628 BC 9m.9 10m.1 0.9" 206° 2017

../images/binary-star-orbits/HJ2477-A-BC-orbit.jpg ../images/binary-star-orbits/HU628-BC-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (300x) A-BC: 2020-04-24: The seeing (3/5) was not good enough for a split.
Mark McCarthy
Fremont (California/USA)
508mm (213x) A-BC: 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?]
STF1296 9m.1 9m.9 1.9" 76° 2019 Lyn 08h59m16.74s / +34°56'46.90"
Robert Zebahl
Leipzig (Germany)
102mm (160x) Overall quite faint double star, but clearly separated with a moderate difference in brightness. Both components are still pretty close together.
ALD115 10m.6 11m.2 2.0" 263° 2016 Cnc 09h00m12.88s / +15°49'30.80"
Mark McCarthy
Fremont (California/USA)
508mm (222x) Fine pair, light orange stars, with seeing
HO360 8m.4 12m.1 3.9" 156° 2015 Cnc 09h00m29.99s / +22°28'08.00"
Mark McCarthy
Fremont (California/USA)
508mm (222x) Faint B easily seen, widely separated from bright white A
STF1297 AB 8m.9 10m.0 5.1" 159° 2019 Cnc 09h00m32.70s / +22°43'36.70"
Mark McCarthy
Fremont (California/USA)
508mm (148x) Nice easy wide Struve, 1 delta mag, physical
STF1302 AB 9m.3 9m.5 2.7" 233° 2017 Hya 09h01m12.87s / +02°44'44.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Near equal easy pair, ~2.5"
STF1300 AB 9m.5 9m.7 5.0" 178° 2020 Cnc 09h01m17.48s / +15°15'56.80"

../images/binary-star-orbits/STF1300-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (148x) Very light orange stars, one more white than the other, well separated, near equal. Physical with 878-year period
STF1298, 66 Cnc AB 6m.0 8m.6 4.4" 137° 2017 Cnc 09h01m24.13s / +32°15'08.30"
AC 6m.0 12m.0 186.8" 319° 2017
Robert Zebahl
Leipzig (Germany)
70mm (80x) AB: At 67x and 80x the companion is visible as a very faint star close to the main component. At 133x it is only visible as a slightly blurred tiny star just outside the first diffraction ring of the primary component.
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB: At 62x clearly separated, significant difference in brightness. The companion can be seen well as a faint little star, apart from the primary component. At 125x easy to split. Component A appeared rather white.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 66 Cnc. Excellent pair. A is a pure white, B is much fainter and seems red to purple color, nicely separated
SHJ101, 67 Cnc 6m.1 9m.2 103.9" 329° 2015 Cnc 09h01m48.84s / +27°54'09.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 67 Cnc. White pair, 2 delta mag, wide.
HU720 8m.6 9m.3 0.8" 136° 2017 UMa 09h03m16.01s / +47°40'18.10"
Mark McCarthy
Fremont (California/USA)
178mm (333x) Suspected at 205x, it is the finest hairline split at 333x, slight magnitude difference, with seeing
A1585, kap UMa 4m.2 4m.5 0.3" 278° 2019 UMa 09h03m37.56s / +47°09'24.00"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Kappa UMa = Talitha australis: With apodizing mask. Much glare but snowman seen steadily inside the mess. Looks like Eta Carina nebula, with a larger bulge toward us and the smaller bulge pointed up and away. No field stars at this magnification, went down to 533x to notice one for the sketch
STF1308 8m.1 9m.2 10.9" 85° 2020 Hya 09h04m59.50s / -03°59'15.10"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x zeigt sich ein enges Sternpärchen, Komponente B im Osten ist eine knappe Größenklasse schwächer
AG161 10m.1 10m.6 4.3" 224° 2019 Cnc 09h05m39.99s / +32°26'35.80"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Very fine white pair, nicely split in the scene, near equal. [sadly it is not physical]
STF1309 8m.5 8m.4 11.7" 273° 2016 Hya 09h06m38.25s / +02°49'06.30"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein Musterdoppelstern, wie er im Buche steht - zwei gleich helle Sterne eng aneinander geschmiegt, knapp getrennt - ganz leichter Farbkontrast, aber nicht definierbar
HU722 9m.2 9m.1 0.5" 244° 2017 UMa 09h06m39.07s / +50°37'36.50"
Mark McCarthy
Fremont (California/USA)
178mm (445x) Notched elongation best I can see
AG162 9m.8 10m.1 4.1" 107° 2018 Cnc 09h07m10.98s / +30°38'30.10"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Pretty, near equal off white stars, ~4" [not physical]
STF1311 AB 6m.9 7m.1 7.5" 199° 2019 Cnc 09h07m27.01s / +22°58'51.10"
Christopher Hay
Seeheim (Germany)
100mm (44x) Well split, very striking pair dominating 1.9° FOV when placed at centre of field.
A common proper motion pair 190 distant to us.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Milk white A and off-white, yellowish B, ~1 delta mag, well separated
POU3029 10m.1 10m.4 8.1" 315° 2018 Cnc 09h08m09.79s / +23°52'42.90"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Wide separation, white stars, about half delta mag
STTA97 8m.3 8m.3 51.5" 274° 2018 Cnc 09h08m27.16s / +27°32'35.30"
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Well split. Very evenly matched pair.
A physical double at a distance to us of 139 light years.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, near equal white.
Mark McCarthy
Fremont (California/USA)
317mm (553x) 80mm finder view shows an arc of three stars. westernmost star is a wide equal pair in the telescope.
STF1317 8m.5 9m.9 7.8" 63° 2016 Cnc 09h09m14.41s / +15°14'27.80"
Mark McCarthy
Fremont (California/USA)
178mm (148x) Easy wide pair, 2 delta mag white stars, part of a large triangle of stars
WRH16, xi Cnc AB 5m.7 6m.2 0.2" 108° 1944 Cnc 09h09m21.53s / +22°02'43.60"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
STF1312 8m.3 8m.8 4.7" 147° 2019 UMa 09h10m18.19s / +52°23'05.70"
Robert Zebahl
Leipzig (Germany)
70mm (44x) 2020-04-19: At 22x clearly elongated, at 31x instantly visible as '8', sometimes barely separated. At 44x clearly separated with little difference in brightness. For the perception of colors the double star was too faint. Together with STF 1321 visible in one field of view.
Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, wide, 1 delta mag. Not physical
★★ STF1306, sigma 2 UMa, 13 UMa AB 4m.9 8m.8 4.4" 346° 2020 UMa 09h10m23.53s / +67°08'03.30"
AC 4m.9 10m.3 197.8" 148° 2003

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) AB: Companion almost permanently visible as elongated, non-condensed brightening of the first diffraction ring of the primary component at the correct position angle.
Christopher Hay
Seeheim (Germany)
76mm (20x) AB, April 2021: No luck with AB at all magnifications from 83x to 167x.
AC: Component C very faint and quite distant, not really seeming to belong.
Mark McCarthy
Fremont (California/USA)
80mm (150x) AB: Suspected very close unequal white stars. 920-year period, slowly widening
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: sehr schwierig bei 88x ../projects/double-stars/uwe-pilz/sketches/200316stf1306.jpg
STF1322 8m.3 8m.7 1.7" 53° 2017 Cnc 09h12m40.15s / +16°31'30.20"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Fine white pair, well split ~2", 1 delta mag
STF1315 7m.3 7m.7 25.1" 28° 2019 UMa 09h12m45.94s / +61°40'32.70"
René Merting
Drachhausen (Germany)
18x70 ja, der ist schick - ein gut getrenntes Sternpaar - zwei fast gleich helle Sterne - B im Nordosten ist vielleicht eine viertel Größenklasse schwächer und wirkt warmweiß gegen die kühlweißen A
Robert Zebahl
Leipzig (Germany)
70mm (22x) Medium bright double star, easy to separate with attractive distance and slight difference in brightness. Together with 16 UMa in one field of view. The brighter component appeared slightly orange, the fainter one showed a hint of blue. However, the colors of the components changed over time. At 57x similar view.
Mark McCarthy
Fremont (California/USA)
80mm (92x) White, wide, near equal
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x gibt es nix zu meckern, ein bequem getrenntes Pärchen - Komponente B im NO ist maximal eine halbe Größenklasse schwächer - leichter Farbkontrast - noch schöner bei 20x, auffällig im Umfeld
BRT155 AB 9m.8 10m.6 4.6" 270° 2018 Cnc 09h12m51.05s / +24°20'29.60"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Almost need averted vision to hold the B star but can manage it direct after a bit of effort. Pretty wide ~4", 2 delta mag. [Not physical. However A is Aa,Ab, 10.45/10.45 0.5", not seen.]
STF1320 9m.5 10m.5 12.1" 217° 2017 Lyn 09h13m21.20s / +42°19'45.90"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy, wide, yellow-white A and blueish B. [not physical]
AG163 10m.2 10m.7 5.1" 320° 2016 Cnc 09h13m34.97s / +24°03'25.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) A fine near equal wide pair, ~5", 10th mag. [surprisingly not physical]
STF1318 7m.8 9m.5 2.6" 227° 2019 UMa 09h13m38.79s / +46°59'25.30"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Separated with clear difference in brightness. The faint companion is slightly outside the first diffraction ring of the primary component.
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very pretty and delicate pair, 2 delta mag and about 2" separation, white stars
★★ STF1321 AB 7m.8 7m.9 16.9" 99° 2019 UMa 09h14m22.79s / +52°41'11.80"
AC 7m.8 14m.5 145.7" 64° 2010
AD 7m.8 11m.9 136.4" 129° 2015

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

Robert Zebahl
Leipzig (Germany)
16x70 AB: 2020-07-05: Very nice view, striking, easily separable. A slight difference in brightness is visible. At first glance the double star appeared noticeably orange compared to the surrounding stars, on closer look a color difference of the two components was visible: orange & rather white.
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.
Robert Zebahl
Leipzig (Germany)
70mm (31x) AB: 2020-04-19: Together with STF1312 in one field of view. At 22x very nice sight, easy to separate, attractive separation. Immediately apparent. A color difference is visible: dark yellow, orange. Also beautiful to see at 44x. Best view at 31x.
Christopher Hay
Seeheim (Germany)
71mm (32x) AB: April 2021: Well split, matched pair. Both orangish.
With 180mm at 200x a wide, even, strong pair. Component A is noticeably slightly brighter. Both of identical pale mandarine-orange colour, rather captivating.
STF1327 AB 8m.8 10m.3 5.3" 32° 2015 Cnc 09h15m32.67s / +27°54'53.40"
Mark McCarthy
Fremont (California/USA)
508mm (148x) White A star and much fainter B, with another further out wide (AC). Not physical
TDS6428 10m.4 10m.5 0.4" 299° 1991 Lyn 09h15m38.21s / +39°42'50.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) B flashes with averted vision only, extremely close split
STF1332 7m.9 8m.1 5.9" 29° 2019 Cnc 09h17m19.21s / +23°39'09.80"

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

Christopher Hay
Seeheim (Germany)
100mm (44x) Clearly split, a little tighter and much less striking than nearby STF 1311 (two degrees to NSW).
STF 1332, at a distance to us 233 light years, has the benefit of a documented orbit, while STF 1311, 190 light years distant, is a common proper motion pair. Hence two physical pairs reasonably close both in the plane of our sky and in actual space.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal wide pair, ~5", maybe half delta mag
STF1336 7m.0 11m.1 40.1" 180° 2015 Hya 09h17m32.92s / +00°33'17.80"
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr weit, kein Doppelstern-Eindruck ../projects/double-stars/uwe-pilz/sketches/200323STF1336.jpg
STF3121 AB 7m.9 8m.0 0.5" 210° 2019 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
Mark McCarthy
Fremont (California/USA)
508mm (533x) IP Cnc. Light yellow-orange stars, 1 delta mag, clean well split. 34.17-year period, it's coming off apastron and will make a quarter turn by 2030. PA to the NE
STF1333 6m.6 6m.7 1.8" 50° 2018 Lyn 09h18m25.97s / +35°21'51.30"
Robert Zebahl
Leipzig (Germany)
63mm (120x) At 93x seen as '8', at 120x split, but pretty tight with no visible difference in brightness.
Christopher Hay
Seeheim (Germany)
71mm (32x) Elongated with clear PA.
Uwe Pilz
Leipzig (Germany)
105mm (200x) fast gleich hell, beide gelblich, bei 66x schwierig ../projects/double-stars/uwe-pilz/sketches/stf1333.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Hairfine split, evenly matched pair, rather attractive. No particular colour.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Brilliant white pair, near equal, ~2" separation
HO43 9m.3 9m.5 0.6" 98° 2017 Cnc 09h18m36.25s / +20°48'49.40"

../images/binary-star-orbits/HO43-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (410x) Fine white stars, not quite 1 delta mag, very nice clean split. Wow. Physical with 358.6-year period, it will widen a couple tenths in the next 20 years
STF1334, 38 Lyn AB 3m.9 6m.1 2.6" 224° 2019 Lyn 09h18m50.64s / +36°48'09.30"

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

Uwe Pilz
Leipzig (Germany)
60mm (198x) Aufhellung im ersten Ring
Robert Zebahl
Leipzig (Germany)
63mm (140x) Fainter companion only seen as permanent brightening on the first diffraction ring. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf1334.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) Figure-8 with clear positions and delta-mags of components. Bluish-white.
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb, trennbar bei 66x ../projects/double-stars/uwe-pilz/sketches/38Lyn.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very bright light blue A and 3 delta magnitude greenish B, close, about 3" separation. Physical with 2782 year period
Christopher Hay
Seeheim (Germany)
180mm (113x) Clean split, large delta-mag. Separation ca. 1.5 times that of nearby STF1333.
27 Hya SHJ105 AB 4m.9 7m.0 229.1" 211° 2015 Hya 09h20m29.03s / -09°33'20.30"
GUI13 AD 4m.9 16m.9 122.3" 227° 2015
DOO49 BC 7m.0 11m.0 9.2" 199° 2016
Christopher Hay
Seeheim (Germany)
7x45 AB: Handheld. AB wide, very disparate brightnesses. Secondary bluish.
A physical double at a distance to us of 222 light years.
STT199 AB 6m.2 10m.0 5.4" 142° 2020 UMa 09h20m43.76s / +51°15'57.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) An excellent pair, B is a very fine four delta point well separated from bright white A
STF1331 AB 8m.5 8m.7 0.9" 153° 2017 UMa 09h20m46.02s / +61°20'58.40"
AC 8m.5 11m.6 13.5" 186° 2015
AD 8m.5 14m.5 19.4" 117° 2015
AE 8m.5 9m.8 139.1" 223° 2015
Robert Zebahl
Leipzig (Germany)
152mm (180x) 2020-04-13: The wide pair AE is already visible at 22x with a significant difference in brightness, but quite inconspicuous. A appeared white-yellowish, E rather orange. The close pair AB appeared immediately elongated at 129x, partly visible as '8'. At 180x, AB was just separated with a fine black space between them. The faint C component was only visible with averted vision. Best view at 180x. The even fainter D component was out of range. ../projects/double-stars/robert-zebahl/sketches/2020-04-13_stf1331.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Fine hairline split with seeing at 205x, better split at 333x, almost 1 delta mag, a very fine pair. Three other faint stars appear with averted vision, and can then barely hold them direct, all nearby and arranged in a right angle to A with two of them on one side. These are C, D, and E
STF1339 9m.2 9m.9 1.5" 65° 2017 Lyn 09h20m58.39s / +36°43'09.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Faint B but still easily seen, resolves nicely with seeing, almost 2 delta mag, ~1.5"
STF1338 AB 6m.7 7m.1 1.2" 314° 2020 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
ES1541 10m.4 11m.2 8.2" 23° 2016 Lyn 09h22m05.95s / +39°58'00.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) White and dull white pair, ~1 delta mag, wide ~8"
STF1340 AB 7m.1 9m.0 6.3" 319° 2018 UMa 09h22m32.22s / +49°32'41.40"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very nice, 2 delta mag white stars, wide, makes an attractive scene
★★ STF1347 7m.3 8m.3 21.1" 312° 2016 Hya 09h23m15.76s / +03°30'05.00"
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-10: At 22x beautifully separated at moderate separation and difference in brightness. Primary component appeared white-bluish, companion slightly orange. At 44x the primary component looked more white-yellowish, the companion showed a clear tendency to orange.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein auffälliges Sternpaar - Komponente B im Nordwesten ist gut abgesetzt erkennbar und ca. ein 3/4 Größenklasse schwächer - bei 20x rücken die beiden Sterne richtig schön zusammen und sind noch knapp getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schöner Farbkontrast ../projects/double-stars/uwe-pilz/sketches/200323STF1347.jpg
AG165 9m.9 10m.1 1.4" 16° 2017 Leo 09h23m19.01s / +22°10'45.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) A is white and hazy (in poor conditions) and B flashes into view with averted vision
STF1344 9m.0 9m.5 3.8" 102° 2019 LMi 09h23m28.35s / +39°08'05.10"
Robert Zebahl
Leipzig (Germany)
120mm (75x) At 50x and 75x split, but tight with little difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint near equal par, ~5". Nice.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen, mit leichtem Helligkeitsunterschied.
STT201 AB 8m.5 9m.5 1.4" 206° 2017 Leo 09h23m54.55s / +27°53'54.90"

../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
★★ STF1348 AB 7m.5 7m.6 2.0" 314° 2018 Hya 09h24m28.48s / +06°21'01.80"

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, at 80x clearly visible as figure '8'. At 100x a very small difference in brightness was to be guessed, at 133x visible. Near the double star STF 1355.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1355, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very pretty half delta mag, ~2" pair, white. Sharp despite low declination
A2477 7m.5 9m.2 0.5" 2016 Leo 09h24m31.21s / +18°08'29.10"

../images/binary-star-orbits/A2477-orbit.jpg

Mark McCarthy
Fremont (California/USA)
178mm (410x) Notched elongation, slight magnitude difference, light yellow stars. Physical with a 250 year period in a nearly circular orbit (we see it face-on)
BU105, kappa Leo, 1 Leo AB 4m.6 9m.7 2.0" 209° 2015 Leo 09h24m39.28s / +26°10'56.80"
AC 4m.6 11m.1 147.7" 212° 2015
Uwe Pilz
Leipzig (Germany)
105mm (180x) AB: Begleiter sitzt im ersten Ring
Robert Zebahl
Leipzig (Germany)
152mm (300x) AB: 2020-04-22: The seeing (2-3/5) was not good enough. The diffraction disk was reasonably well visible, but the diffraction rings smudged. No split.
Robert Zebahl
Leipzig (Germany)
152mm (300x) AB: 2020-04-24: Seeing was mediocre (3/5). The faint companion was partly seen as a distinct brightening in the first diffraction ring of the primary component. Not at all easy. Steady air necessary.
Mark McCarthy
Fremont (California/USA)
178mm (148x) AB: Very tough, B is a very tiny point or fleck very closely split, need low power to reduce flaring from bright light yellow-orange A. Burnham discovered with his 6-inch and says: "A fine pair even with a small aperture."
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Kappa Leonis: Very tough but palpable split. Seeing needed to settle to perfection for primary to resolve to just an airy disk without diffraction or flaring, and for a couple of seconds could see the much fainter ~10th magnitude B star as a pin-point, ~2" separation. Fleeting view.
★★ STT200 6m.5 8m.6 1.2" 336° 2019 UMa 09h24m55.67s / +51°34'26.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange A, B a deeper orange, maybe because it's 2-3x fainter. B resolves from within A's diffraction when seeing settles, ~1". Wow!
STF1346 AB 7m.7 8m.6 5.8" 315° 2018 UMa 09h25m37.88s / +54°00'57.50"
BC 8m.6 11m.8 93.9" 188° 2015
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: 2020-04-19: At 31x very tight with clear difference in brightness. At 44x very fine separation. Component A appeared creamy white, B partly slightly orange.
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Easy 1 delta mag pair, pretty wide. Physical
A222 9m.1 9m.4 0.4" 2017 Leo 09h26m02.33s / +28°39'01.50"

../images/binary-star-orbits/A222-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Suspect it at all powers up to 667x, where I get a persistent clean split through the seeing. Light orange stars, 1 delta, PA just east of north. 155.08-year period, it will only cross the north line to head west by 2030
AG166 9m.1 11m.1 3.6" 74° 2018 Hya 09h26m45.80s / +01°04'57.40"
Mark McCarthy
Fremont (California/USA)
203mm (333x) B balrey seen with direct vision, brighted with averted vision. Pretty. ~1-2 delta mag, ~4"
A128 9m.6 10m.0 1.3" 262° 2017 Hya 09h26m52.30s / -03°14'42.00"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Fine pair, but need to wait for seeing for split. ~1" and half delta mag, white stars
★★ STF1355 7m.7 7m.8 1.8" 357° 2018 Hya 09h27m16.69s / +06°13'59.00"

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, equally bright. At 80x detectable notch. At 100x and 133x clearly visible as figure '8'. Near the double star STF 1348.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1348, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow pair, near equal, very nice, ~2"
STF1353 9m.9 10m.0 3.3" 125° 2017 Leo 09h27m39.28s / +15°44'32.00"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Faint & hazy in poor conditions. Elongated haze split with seeing, near equal
Mark McCarthy
Fremont (California/USA)
317mm (553x) Well separated near equal 9th magnitude white stars, ~4"
TDS6583 10m.8 10m.9 0.6" 92° 2009 Lyn 09h28m23.15s / +39°54'56.70"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Just split with seeing, very tight, noticeable mag difference ~0.5-1, orange stars
STF1356, ome Leo 5m.7 7m.3 1.0" 114° 2020 Leo 09h28m27.41s / +09°03'24.40"
Mark McCarthy
Fremont (California/USA)
178mm (445x) Ome Leo. Elongated at 205x, but nice clear disks with diffraction rings at 445x, plenty of room in the split, <1", slight magnitude difference, white stars. Physical with a 117.97-year period, it is nearing apastron where it will sit for the next two decades
Mark McCarthy
Fremont (California/USA)
203mm (205x) Omega Leo. Elongated & notched, similar magnitude, yellow-orange stars
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close but clean split, in each other's diffraction, half delta mag, white.
41 Lyn, S598 AB 5m.5 7m.8 69.7" 160° 2017 UMa 09h28m39.99s / +45°36'06.50"

This star has the designation 41 Lyn but is assigned to UMa. At the time, when Flamsteed numbered the stars, the constellation boundaries were not exactly defined. Another example is 10 UMa, which is located in Lyn today.

Robert Zebahl
Leipzig (Germany)
8x40 Fairly well split with fainter component.
HJ1167, tau 1 Hya, 31 Hya 4m.6 7m.3 67.5" 2012 Hya 09h29m08.84s / -02°46'08.20"
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Wide, almost exactly north-south oriented. Primary slightly yellowish.
A physical double at a distance to us of only 57 light years.
BAL2364 10m.0 10m.5 8.7" 140° 2016 Hya 09h29m16.38s / +03°05'44.00"
Mark McCarthy
Fremont (California/USA)
203mm (333x) A bit more than half delta mag, wide stars. B is faint, nearly needs averted vision
BU591 7m.8 8m.9 1.0" 29° 2017 Hya 09h29m36.43s / -03°07'20.40"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very nice pair. Split with seeing, noticable mag difference, hairline only
STF1360 AB 8m.9 8m.9 13.8" 242° 2017 Leo 09h30m35.95s / +10°36'06.40"
Mark McCarthy
Fremont (California/USA)
203mm (205x) GS Leo. Wide, light orange-yellow, near equal
Mark McCarthy
Fremont (California/USA)
317mm (553x) Unremarkable wide separation 8th mag stars.
STF1349 7m.5 9m.0 19.2" 166° 2015 UMa 09h31m09.89s / +67°32'28.40"
René Merting
Drachhausen (Germany)
18x70 einfacher als der benachbarte Doppelstern STF 1350 - ordentlich getrennt - Komponente B ist 1 bis 1.5 Größenklassen schwächer
Christopher Hay
Seeheim (Germany)
60mm (25x) At 25x a wide split, substantial difference in brightness, B a fine pinprick of light. B appears light blue at first, but colour impression disappears quickly - an interesting visual effect repeated several times. According to Stelledoppie a true physical pair. Nice together with Struve 1350 in same FOV. A very fine double-double for very small apertures.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x easy to separate with significant difference in brightness. The primary component appears whitish, the companion darker. At 44x, the primary component looks rather white-yellowish, the companion greyish.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x stehen beide Sterne bequem getrennt auseinander - Komponente B im Süden ist eine knappe Größenklasse schwächer und kupfergrau - ein schönes Doppel-Doppel zusammen mit STF1350 gut 47' weiter südsüdöstlich
Uwe Pilz
Leipzig (Germany)
105mm (88x) sichtbar bei 21x ../projects/double-stars/uwe-pilz/sketches/200316stf1349.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x steht das Pärchen gut auseinander - Komponente B ist eine dreiviertel Größenklasse schwächer und wirkt grauweiß - A ist weiß mit einem zarten Stich ins Gelbe
STF1365 7m.4 8m.0 3.5" 156° 2017 Hya 09h31m31.26s / +01°27'55.10"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist eine 8 erkennbar - in guten Momenten präsentieren sich beide Sterne knapp getrennt - Komponente B im SO ist eine halbe Größenklasse schwächer
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wide off-yellow pair, ~4", ~1.5 delta mag
STF1351, 23 UMa AB 3m.6 9m.2 22.7" 267° 2016 UMa 09h31m31.57s / +63°03'42.50"
AC 3m.7 11m.8 107.4" 232° 2015
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-07: Well separable with a significant difference in brightness, where the companion appearing only as a tiny star close to the primary component. The primary component itself appeared bright and rather whitish.
Mark McCarthy
Fremont (California/USA)
80mm (92x) AB: 23 UMa. Light yellow and much fainter wide B
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist A gleißend, B im Westen extrem schwacher Lichtpunkt, gut 4-5 Größenklassen schwächer - bei 64x kann ich A ein wenig gebändigt erkennen und hat einen leichten Stich ins Gelbliche, B ist ordentlich abgesetzt
Mark McCarthy
Fremont (California/USA)
317mm (270x) AB: 23 UMa. Lovely yellow-white and 3x fainter wide B, white.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ist Komponente B schwach sichtbar neben dem gelblich strahlenden 23 UMa - großer nicht abschätzbarer Helligkeitsunterschied
SHJ107, 6 Leo 5m.2 9m.3 37.1" 77° 2018 Leo 09h31m57.58s / +09°42'56.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) A star is light orange & 3 delta mag to B star which is a white, well separated point
STF1364 AB 8m.6 9m.7 16.2" 155° 2017 Leo 09h32m01.52s / +20°02'49.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Unremarkable wide separation faint stars
STF1359 AB 9m.8 10m.8 7.5" 54° 2019 UMa 09h32m58.20s / +56°14'59.10"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Dim for a Struve, 1 delta mag, pretty wide, white stars. Not physical
HN 29 6m.5 12m.1 27.6" 263° 2017 Leo 09h33m18.32s / +28°22'04.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very wide, very faint B star. Not very exciting.
HJ467 10m.0 11m.0 8.8" 277° 2015 Leo 09h33m47.51s / +26°21'27.30"
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2020-04-23: Split with visible difference in brightness. Unspectacular.
★★ STF1350 AB 8m.3 8m.3 10.2" 249° 2015 UMa 09h34m19.56s / +66°47'42.30"
AC 8m.3 9m.2 131.0" 216° 2015
René Merting
Drachhausen (Germany)
18x70 AB: ein sehr enger Doppelstern, äußerst knapp getrennt … und das auch nur in guten Momenten, ansonsten wirkt das Paar wie eine Ameise - beide Sterne sind gleich hell - ein FG-Tester für 18x
Christopher Hay
Seeheim (Germany)
60mm (25x) AB: Tight but nicely split at 25x. No colour whatsoever seen. A appears brighter than B, whereby the data do not support this – perhaps a product of different (yet not seen) colouration? According to Stelledoppie not a physical pair. Attractive together with Struve 1349 in same field of view.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x A & B equally bright and still pretty close together. Component C is visible at a much greater distance. At 44x, A & B show a color difference: orange, white-bluish.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein schönes enges Paar zweier gleich heller Sterne, knapp getrennt - STF1350 AB bildet mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense
AC: bei 32x bildet STF1350 AB mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense - der erste der vier Sterne bzw. der nächststehende Stern südsüdwestlich mit mehr als zehnfachem Abstand AB ist Komponente C, er ist schätzungsweise eine halbe Größenklasse schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: trennbar bei 21x. Fast gleichell, aber deutlicher Farbkontrast, lohnend. ../projects/double-stars/uwe-pilz/sketches/200316stf1350.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 22x, all three components are already visible, with A & B still standing quite close together. Component C is less prominent. At 69x and 100x, the pair AB shows a nice color contrast: The eastern component mostly appeared in a slightly shiny orange, while the other component appeared more white-bluish. During the observation, however, the colors changed between both components. At the time of observation, the pretty bright comet C/2019 Y4 Atlas was also in the same field of view - a great scene! Note to the sketch: The positions of the stars to each other do not exactly match, also the alignment of the pair AB to C. ../projects/double-stars/robert-zebahl/sketches/2020-03-18_stf1350_c2019_y4_atlas.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) AB: Immediately striking in 32x71 superfinder wihle panning through the area, a very evenly matched pair well split at that power. Closer inspection with the 7-inch at 113x reveals a fine blue-orange colour contrast between components A and B.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß
STF1369, DI Lyn AB 7m.0 8m.0 25.1" 150° 2019 Lyn 09h35m22.50s / +39°57'47.70"
AC 7m.0 8m.4 116.3" 323° 2017
BC 8m.0 8m.4 141.6" 324° 2017
Christopher Hay
Seeheim (Germany)
15x45 AB: Binoculars with internal stabilisation, handheld. Clearly split, a compact little pair. Involved in a nice triangle of 42 and 43 Lyn to the east plus a third bright, orangish star to the south.
AB is a physical double at a distance to us of 278 light years.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: DI Lyn Very wide and bright light yellow stars, ~1 delta mag. [did not notice COU 2084 Aa,Ab, 6.98/8.79 0.2"]
STF1371 AB 7m.9 10m.2 8.2" 275° 2016 Hya 09h35m25.26s / +03°54'19.40"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice yellowish A, widely separated from nealry three delta mag B
HU1128, 11 LMi 4m.8 12m.5 7.1" 59° 2016 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.
STF1366 8m.4 10m.1 7.8" 321° 2019 UMa 09h35m42.47s / +53°17'40.40"
Uwe Pilz
Leipzig (Germany)
120mm (94x) mit STF 1368 ../projects/double-stars/uwe-pilz/sketches/220604STF1366-1368.jpg
Mark McCarthy
Fremont (California/USA)
178mm (205x) This one is a 2 delta magnitude pair, about 8", pretty wide. Physical. There is another wide near equal pair to the east about 30" away
ES428 9m.3 11m.2 13.6" 203° 2017 Leo 09h36m31.37s / +28°20'23.20"
Mark McCarthy
Fremont (California/USA)
203mm (205x) B pops out with averted vision, widely separated. A is white, and I can barely hold b direct. At the end of an attractive curve of four stars of similar magnitude
STF1372 AB 8m.5 8m.6 0.4" 253° 2020 Leo 09h37m07.57s / +16°13'33.30"
Mark McCarthy
Fremont (California/USA)
508mm (445x) With apodising mask. All I have is an elongation with PA WSE, which seems to be where B is. A is canary yellow at low power, light yellow-orange with high power, and there is definite elongation. Physical with a 371-year period, it is slowly coming off apastron. Current separation 0.321"
STF1362 7m.0 7m.2 4.9" 125° 2017 Dra 09h37m56.18s / +73°04'49.50"

../images/binary-star-orbits/STF1362-orbit-solution-1.jpg ../images/binary-star-orbits/STF1362-orbit-solution-2.jpg ../images/binary-star-orbits/STF1362-orbit-solution-3.jpg ../images/binary-star-orbits/STF1362-orbit-solution-4.jpg

Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-04-21: At 22x extremely tight, but separable. At 31x very fine separation. Both components appeared white. Very nice sight! At 57x well separated, similarly bright. One component appeared white-yellowish with a hint of orange, the other more white.
STT204 AB 6m.7 10m.7 8.3" 99° 2016 Leo 09h38m45.69s / +10°46'39.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Hard white A with B a haze, sharpened to point with averted vision. Well separated, 3 delta mag.
STF1374 AB 7m.3 8m.7 2.8" 312° 2019 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
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen, mit klarem Helligkeitsunterschied. Beide Sterne erstrahlen weißlich.
STT206 8m.3 11m.4 17.9" 224° 2015 Leo 09h42m18.84s / +17°04'55.60"
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB is the widely separated ~1 delta mag. star, about 40". There's fainter star popping out with averted vision in between them, which is the AD pair, 11th mag.
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB is the widely separated ~1 delta mag. star, about 40". There's fainter star popping out with averted vision in between them, which is the AD pair, 11th mag.
STT205 8m.0 12m.6 12.0" 202° 2018 Lyn 09h42m29.17s / +40°58'25.20"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Yellow and orange pair ~1 delta mag.
ES301 9m.8 11m.8 5.0" 242° 2019 Lyn 09h42m42.81s / +40°17'30.90"
Mark McCarthy
Fremont (California/USA)
508mm (333x) B appears fine and clear with averted vision, blue color, and can then barely hold it with direct vision. Light yellow A. Very nice
A2761 9m.0 9m.2 1.0" 252° 2017 Sex 09h43m29.38s / +06°12'27.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Attractive yellow-orange A and bluish B, well separated, about three delta mag
STF1376 AB 9m.1 9m.1 5.4" 309° 2017 UMa 09h45m01.10s / +43°13'39.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Clean white pair, near equal, wide about 5". Physical. 14th mag BC not seen
HU630 9m.4 9m.6 2.2" 74° 2017 UMa 09h47m36.09s / +50°57'17.30"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very fine pair, difficult in poor seeing and transparency, slight magnitude difference, about 2". Physcial
STF1384 9m.8 10m.0 11.6" 183° 2017 Leo 09h49m56.91s / +16°19'55.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair, near equal, wide
A2560 8m.8 9m.8 1.1" 18° 2017 Sex 09h50m02.86s / +01°47'37.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Challenging faint close companion suspected with 333x, but seen well with 533x. With seeing, light orange A and blue B, ~2 delta mag, ~1" separation
HO369 AB 8m.0 9m.8 0.3" 284° 2020 LMi 09h51m09.34s / +36°29'20.80"

../images/binary-star-orbits/HO369-AB-orbit-solution-1.jpg ../images/binary-star-orbits/HO369-AB-orbit-solution-2.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
STF1381 8m.9 9m.2 0.8" 187° 2017 UMa 09h51m15.22s / +60°37'00.10"

../images/binary-star-orbits/STF1381-orbit.jpg

Mark McCarthy
Fremont (California/USA)
178mm (205x) Finest split with seeing, very small scale at this magnification, light orange star, very significant magnitude difference. Physical with a 1787.6479-year period, this is actually one to watch because it is rapidly nearing periastron and will tighten over the next couple of decades
STT208, phi UMa 5m.3 5m.4 0.4" 315° 2019 UMa 09h52m06.36s / +54°03'51.40"

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

Uwe Pilz
Leipzig (Germany)
105mm (260x) länglich, schwierig
Mark McCarthy
Fremont (California/USA)
178mm (333x) Tough in poor seeing and transparency. Bright white A, significant delta magnitude, B's PA a little north of west. There are three stars in a wide triangle in the field, B points to base line. Physical with 104.6-year period, it will widen slightly and will reach apastron by 2040
Christopher Hay
Seeheim (Germany)
180mm (290x) 4 April 2021 (0.43" angular distance according to database at time of observation): At 200x seems oval. At 290x definite elongation and clear position angle. My personal record for double-star detection and PA perception with the seven-inch telescope.
A2139 8m.0 10m.7 2.0" 292° 2015 LMi 09h52m15.53s / +40°58'13.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) White A and blue B, ~2" separation, >2 delta mag. [not physical]
STF1389 9m.1 9m.5 2.4" 290° 2019 Leo 09h52m26.17s / +26°58'53.80"

../images/binary-star-orbits/STF1389-orbit.jpg

Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, around 1 delta mag, well separated. Physical with a 1454-year period
AC5, gam Sex AB 5m.4 6m.4 0.5" 38° 2019 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
STT209 7m.4 10m.3 4.9" 309° 2019 UMa 09h53m17.23s / +50°37'16.30"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Light yellow-orange A, B is very much fainter about 3 delta mag, wide about 5". Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange-yellow disk with faint diffraction ring. Extremely faint blue B ~4" can see it direct vision but it flashes forth with averted.
S605, 9 Sex 6m.9 8m.4 53.5" 287° 2019 Sex 09h54m06.70s / +04°56'43.50"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein weit auseinander stehendes Pärchen, das trotzdem schön anzusehen ist - Komponente B im Nordwesten ist gut 1.5 Magnituden schwächer - A samtgelb, B kupfergrau - zurück auf 20x sind beide Sterne auch noch komfortabel getrennt - die Farbe von A ist noch intensiver, jetzt eher rapsgelb
STF1399 7m.7 8m.4 30.2" 176° 2017 Leo 09h57m02.21s / +19°45'44.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Easy to split with nice distance and obviously unequal. A conspicuous group of fainter stars is nearby. Main component appeared in a warm-white, fainter somehow darker (partly bluish, partly slightly orange).
Uwe Pilz
Leipzig (Germany)
105mm (53x) wie ein Schlangenbiß
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint pair, tough find dense with stars. 1 delta magnitude, wide separation.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201399.png
STF1394 8m.9 9m.8 4.5" 250° 2019 UMa 09h57m14.57s / +45°54'10.10"

../images/binary-star-orbits/STF1394-orbit.jpg

Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, >1 delta mag, wide about 5". Physical
TOK668 6m.1 7m.4 5.3" 259° 2016 Dra 09h57m52.09s / +76°36'46.70"
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-21: At this position no comparably bright star was visible.
STF1398 8m.1 11m.4 4.1" 102° 2017 UMa 10h01m32.06s / +68°43'05.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near M81 & M82! Did not see the 11th mag, 3" B star, tried really hard. To the south is a tight = red pair.
★★ STT210 8m.5 9m.1 1.3" 257° 2016 UMa 10h02m35.64s / +46°21'42.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Excellent fine pair, with seeing, light yellow-orange, 1 delta mag, split but very close
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow A and white B, very tight. Faint, seeing needs to be perfect to see B in the diffraction.
STF1403 9m.6 9m.9 2.8" 334° 2020 Leo 10h02m51.33s / +07°42'20.20"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, with seeing in poor conditions, well split, 2 delta mag
HU631 8m.0 9m.3 0.8" 258° 2017 LMi 10h03m59.08s / +32°38'48.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Bright orange-yellow A star, B is a very small, faint blue point, ~1" separation, very much fainter ~3 delta mag
TDS6998 11m.1 11m.4 0.8" 297° 1991 Leo 10h04m05.09s / +27°26'54.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongation flashing with averted vision, but its hazy, not clear
STF1406 8m.4 9m.4 0.7" 219° 2017 LMi 10h05m38.57s / +31°05'13.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tight, kissing when seeing stills, 1 delta mag. white
★★ A2142 8m.0 8m.8 1.1" 291° 2018 LMi 10h05m43.55s / +41°02'42.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine, split, ~1-1.5". 8th magnitude and 1.5 delta mag B, close split, very nice pair. In the 80mm finder this is one of a triangle of equal magnitude stars.
STF1405 7m.3 11m.8 22.2" 252° 2017 LMi 10h05m55.92s / +39°34'55.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 8th and 10th magnitudes. B is blurry with direct vision and flashes with averted. Wide split. A is white with a little yellow.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist sehr einfach zu trennen, aber hier liegt die Herausforderung beim großen Helligkeitsunterschied von über 4 mag.
TDS569 10m.9 11m.1 2.3" 89° 2017 Leo 10h06m33.24s / +26°01'34.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy, near equal blue-white stars, >2" separation [not physical]
COU166 10m.5 10m.5 2.4" 159° 2016 Leo 10h07m15.20s / +22°15'17.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) B flashes into view with averted vision. Close pair ~2" separation
GAN5, 31 Leo 4m.4 13m.6 8.2" 41° 2016 Leo 10h07m54.32s / +09°59'51.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Light orange star, I did not see B. New designation, George Anderson, Born: Scotland, 1839. He was the observing assistant to Asaph Hall, and was at the Observatory from 1870 to 1900. Six discoveries to his name
A2564 9m.8 10m.0 0.7" 285° 2017 Leo 10h08m16.54s / +08°01'55.90"
Mark McCarthy
Fremont (California/USA)
178mm (333x) Tough, with seeing, faint and hazy white stars, hairline split when they sharpen with seeing. Suspected with 205x, 445x is too much power for the conditions
★★ alpha Leo, 32 Leo, Regulus STFB6 AB 1m.4 8m.2 179.2" 304° 2019 Leo 10h08m22.31s / +11°58'01.90"
HDO127 AD 1m.4 12m.1 195.3" 274° 2015
HDO127 BC 8m.2 13m.2 2.2" 94° 2019
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. B immediately pops out from the glare of A, thanks to its substantial distance. B is a vivid blue.
Emboldened by the unexpected ease with which the pair can be seen in the 10x56, I launch an attempt with 7x50 bins on the tripod. This is thwarted by the many rays emanating from A in the image. Too much exit pupil?
AB is a physical double at a distance to us of only 79 light years.
Christopher Hay
Seeheim (Germany)
15x60 AB: On tripod. B is a fine pinprick of light, seems bluish. An attractive unevenly matched pair.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist B weit abgesetzt von A erkennbar - Regulus präsentiert sich strahlend weiß - B ist nur schwach weiß - kein echtes Doppelsternfeeling
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: sehr weit; einfach
Sarah Gebauer
Germany
150mm (30x) AB: relativ dicht beieinander, ein Stern sehr hell und groß, der zweite schwach und klein
Gerd Kohler
Langenzenn (Germany)
254mm (76x) AB: Bläulich-weiß - leicht rötlich. Großer Helligkeitsunterschied.
Gerd Kohler
Langenzenn (Germany)
254mm (76x) AD: Beim Begleiter von Regulus steht im fast gleichen Abstand, etwas nach Westen versetzt, ein sehr schwacher Stern.
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x extrem weit getrennt erkennbar - Komponente A ist weißblau, die wesentlich schwächere Komponente B strahlt weißgrau
René Merting
Drachhausen (Germany)
320mm (72x) AD: Komponente D ist südwestlich von B (STFB6) erkennbar, etwas weiter von A entfernt als B, klein und unscheinbar
STF1407 10m.2 10m.6 4.9" 50° 2020 UMa 10h09m01.98s / +64°26'40.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal faint 10th-11th mag white stars, 4"
A1988 10m.0 9m.8 0.4" 223° 2008 Leo 10h09m04.77s / +25°31'03.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Clean split with seeing, light orange stars, fairly equal but noticeable magnitude difference
A2144 AB 9m.8 11m.6 2.7" 287° 2015 Leo 10h09m09.51s / +21°15'29.90"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Light yellow-white A and B is easily seen, ~2" separation, yellow, almost two delta mag
A2565 8m.8 10m.3 1.3" 260° 2015 Leo 10h10m54.49s / +07°41'40.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Amazingly I'm able to split it at 205x, 2 delta mag white stars, little more than 1" separation, very small scale
COU287 10m.5 10m.8 1.4" 95° 2017 Leo 10h10m58.48s / +18°33'58.60"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Near equal, light orange, split about 1"
HU874 6m.9 7m.9 0.2" 288° 2019 Leo 10h11m38.19s / +13°21'18.70"

../images/binary-star-orbits/HU874-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 34 Leo. A notched elongation is the best I could see, not resolved well. Slight mag difference but really too hard to tell A from B. My PA estimate is off 90-degrees. This is rapidly closing and will be at periastron by the middle of 2022, opening again and should be better detectable again by 2029 when it will be 0.208". 17.962-year period
STF1413 9m.8 9m.8 1.8" 270° 2019 Leo 10h12m18.72s / +16°20'54.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close ~2", very faint equal pair.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very pretty equal pair, white, close ~1.5"
STT213 AB 8m.6 9m.8 1.1" 125° 2019 Leo 10h13m08.88s / +27°25'10.50"

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

Mark McCarthy
Fremont (California/USA)
178mm (333x) Very tough at this aperture, I suspected it at 205x but can more consistently see it with 333x. A is a light orange star and B splits but is very tight, needed averted vision at first but it brightens and holds with foveal coaxing, but it s very faint indeed. Physical with a 192-year period, it's now at apastron and will stay there a while
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright yellow A, ~2 magnitudes fainter B, very wide separation.
L10 10m.0 10m.5 1.1" 352° 2017 Leo 10h14m33.75s / +17°53'24.40"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Unbelievably fine split with 205x! Very small scale, the dim stars are small disks so the separation is clean. Very slight magnitude difference, white stars, really fine. Higher magnification hazes the image too much. T. Lewis of Greenwich Observatory
STF1417 9m.2 9m.3 2.4" 78° 2019 Leo 10h15m08.60s / +19°07'27.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint, close, but well split pair, 3", B resolves better with averted vision.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Equal yellow-white pair, ~2"
HU1254 AB 10m.1 10m.4 0.6" 15° 2016 Leo 10h15m10.48s / +11°52'43.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Elongated to hairline split. Noticeable magnitude difference
STT215 7m.2 7m.5 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"
SHY552 7m.4 8m.8 106.9" 2020 LMi 10h16m38.13s / +41°16'33.00"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Pair of stars in a perfect triangle of widely separated stars looking like Leo's rump. ~8th, 8.5, and 9th mag.
STFA18, zeta Leo, 36 Leo, Adhafera 3m.5 6m.0 331.3" 337° 2015 Leo 10h16m41.41s / +23°25'02.40"
René Merting
Drachhausen (Germany)
100mm (32x) ein helles extrem weit getrenntes Paar - zwischen A im SO und B im NW sind etwas versetzt noch zwei schwache Sterne zu erkennen, aber beide ohne Bezug zu STFA18
BVD81 5m.8 10m.0 79.6" 28° 2015 Leo 10h16m41.83s / +25°22'14.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very wide 2-3 delta mag yellow-orange & whitish-yellow.
STF1419 8m.9 9m.9 4.5" 225° 2019 Leo 10h17m02.94s / +10°06'51.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint pair, 1 delta mag, PA west ~4-5"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Light yellow-white A and slightly blue B, wide ~4", ~1 delta mag
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201419.png
STT523, 39 Leo 5m.8 11m.3 7.9" 300° 2017 Leo 10h17m14.53s / +23°06'22.30"
René Merting
Drachhausen (Germany)
100mm (213x) bei 142x habe ich das Gefühl, Komponente B ab und an westlich von A ganz schwach im ersten Beugungsring ausmachen zu können, aber noch unsicher - bei 213x dann zeigt B sich eindeutig und kann ab und an auch mal länger gesehen werden
Mark McCarthy
Fremont (California/USA)
508mm (333x) 39 Leo. ! Nice bright light yellow-orange A star. B is very small, very faint, ~8" separation, a single little point, barely has its own light
STF1415 AB 6m.7 7m.3 16.5" 168° 2019 UMa 10h17m50.61s / +71°03'38.90"
AC 6m.7 10m.8 153.3" 13° 2015
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2022-03-27: Beautiful double star, bright, conspicuous with small difference in brightness. The components appeared yellowish-orange and white-bluish.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-07: At 22x immediately noticeable as double star, medium bright with rather small difference in brightness. A appeared whitish, B slightly orange, partly brownish. At 44x similar color impression: A white-bluish, B slightly orange.
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: 2021-04-03: At 12x easily separated, moderate brightness difference, unspectacular. At 44x, A appeared pale yellowish, B in very light blue. The color contrast was very subtle.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein eng stehendes ordentlich getrenntes Paar - Komponente B im Süden wirkt weißgrau gegen die gut eine halbe Größenklasse hellere A-Komponente - das Paar sieht schick aus, es wird von drei schwächeren Sternen umrahmt
A2369 8m.5 9m.7 1.0" 296° 2017 Leo 10h17m59.92s / +17°11'11.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Needed higher magnification to get it. Orange star with a faint but nice star in first diffraction ring, much fainter, ~1". Nice
STF1421 8m.2 9m.1 4.5" 331° 2020 Leo 10h18m05.54s / +27°31'27.90"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ein schönes enges knapp getrenntes Pärchen - Komponente B im NW ist gut eine Größenklasse schwächer und wirkt dadurch dumpfer
Mark McCarthy
Fremont (California/USA)
317mm (553x) Not difficult, 1 delta mag, 5" or so. Bluish.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Wide pair, >1 delta mag, white tinged with yellow, ~5"
Berthold Fuchs
Wiesbaden (Germany)
130mm difficult DS ../projects/double-stars/berthold-fuchs/photographs/STF%201421.png
STF1420 9m.1 10m.6 2.2" 318° 2016 LMi 10h18m33.30s / +39°06'37.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint orange and 2 delta mag B ~2".
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist noch gerade so dauerhaft sicher zu trennen, bei einem recht sichtbaren Helligkeitsunterschied von über 1,5 mag.
COU170 11m.1 11m.8 0.9" 112° 2012 Leo 10h18m41.27s / +21°55'22.80"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Can't see the pair but there seems to be two galaxies in the field. [NGC 3189 & 3187]
STF1423 9m.4 10m.1 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 2m.4 3m.6 4.7" 127° 2020 Leo 10h19m58.35s / +19°50'29.40"

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

Christopher Hay
Seeheim (Germany)
20x60 Handheld in reclining chair, binoculars with internal stabilisation. 14 May 2022 (4.7" angular distance according to database): Pear-shaped. Strong orange-lemon yellow, a fruity affair. PA estimated 140° without prior knowledge, a good enough match, considering the low magnification, to the database figure of 127° ascertained post-observation.
Christopher Hay
Seeheim (Germany)
44x100 21 May 2022 (4.7" angular distance according to database): Hairfine split, slightly difficult due to bloated stars in these achromatic (not apochromatic) binoculars. Both components orange, with secondary going into yellow. Thin cloud moving through tightens up the star images and makes the split much clearer. Clearest shortly before clouds become so dense as to swallow the pair.
Christopher Hay
Seeheim (Germany)
36mm (50x) 21 May 2022 (4.7" angular distance according to database): At 40x deeply notched, at 50x tenuously split, at 66x cleanly and clearly split.
Robert Zebahl
Leipzig (Germany)
55mm (38x) At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_gamma_leo.jpg
Robert Zebahl
Leipzig (Germany)
55mm (59x) Very nice unequal double. A appeared yellow-orange, B rather white-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_gamma_leo.jpg
Christopher Hay
Seeheim (Germany)
60mm (58x) At 25x Algieba is already very elongated. At 58x a sliver of dark between the components, with clear brightness difference. At 70x split becomes more stable, but view not so pleasing as at 58x. Both components display vivid orange.
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 67x still a relatively close pair, but well separated with quite a clear difference in brightness. At 100x easy to separate and visible color difference: A yellowish to slightly orange, B white-yellowish.
Robert Zebahl
Leipzig (Germany)
102mm (125x) Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) very bright double star, slight colour contrast
Uwe Pilz
Leipzig (Germany)
105mm (120x) schon bei 37x sehenswert; trennbar bei 55x; orange-blauweiß
Robert Zebahl
Leipzig (Germany)
120mm (66x) At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: merklicher Helligkeitsunterschied, A = gelb-orange, B = gelb-orange ../projects/double-stars/winfried-kraeling/sketches/180408_04_Gamma%20Leo.jpg
Sarah Gebauer
Germany
150mm (83x) bei 83x sauber getrennt, ein leichter Farbunterschied (Weiß und helles Gelb) sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200411%20Gamma%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Algieba: Bright yellow and yellow-orange pair, 1 delta mag, 4-6"
René Merting
Drachhausen (Germany)
320mm (240x) bei 240x sehe ich zwei ordentlich getrennte Sterne (naja, nicht wirklich Sterne, sondern wild zappelnde Glitzerbällchen) - Komponente A strahlt in einem zarten Gelb, B ist weiß - zurück auf 144x sehe ich nur ein Stäbchen mit leichter Einschnürung, so wild tanzen die Sterne
Mark McCarthy
Fremont (California/USA)
508mm (333x) Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire
HJL1057 8m.0 8m.8 205.6" 167° 2015 LMi 10h20m02.46s / +33°33'17.30"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Wide split but secondary very faint (NELM 5m1 in target area). STTA104 one degree to the northeast has practically identical separation yet is much stronger.
The charm of this pair resides less in its visual appearance than in contemplating that it is a physical double at a distance to us of 287 light years.
STF1426 AB 8m.0 8m.3 0.9" 313° 2018 Leo 10h20m32.32s / +06°25'47.60"
AB-C 7m.3 9m.4 7.6" 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
STF1425 9m.9 10m.7 4.8" 358° 2017 UMa 10h21m34.14s / +46°09'07.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair, about 1 delta, wide about 5". Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint pair, ~4-5" orange and blue, 0.5 delta mag.
STF1427 8m.2 8m.5 9.3" 215° 2018 UMa 10h22m00.53s / +43°54'19.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x very fine separated, but still tight. A very small difference in brightness was visible. At 44x also a nice view. In both magnifications I could see color differences: pale orange, grey-blue.
Mark McCarthy
Fremont (California/USA)
178mm (205x) White stars, typical Struve, not quite 1 delta mag, wide
Mark McCarthy
Fremont (California/USA)
317mm (277x) 8th magnitude orange star and a very wide 1 delta mag B.
BU1321 9m.6 12m.5 2.0" 130° 2016 Leo 10h22m03.20s / +12°25'42.00"
Mark McCarthy
Fremont (California/USA)
508mm (205x) White A and very faint B which I can just hold with direct vision, ~3", it brightens with averted vision
★★ STT216 7m.4 10m.3 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
A1990 9m.5 9m.6 1.5" 290° 2017 Leo 10h23m25.93s / +26°29'38.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal, elongated in a haze but does resolve to two stars with seeing, a bit more than 1" separation
A1991 10m.1 10m.4 1.5" 191° 2019 Leo 10h23m34.87s / +26°17'26.10"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal, split with seeing, ~1" separation
HJ2530 AC 6m.4 6m.7 201.6" 63° 2015 Sex 10h24m13.15s / +02°22'05.10"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Wide, strong, well-matched pair. Component A slightly orange, C colder. Nice in 8.6° FOV with Alpha and Beta Sextantis.
Christopher Hay
Seeheim (Germany)
12x36 Binoculars with internal stabilisation, handheld. Wide, very evenly matched pair, strong at this magnification in 5.6° FOV. Component A slightly orange, C slightly blue.
STTA104 7m.2 7m.3 209.0" 287° 2013 LMi 10h24m22.19s / +34°10'35.00"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Wide, striking matched pair. Nice together with triangle of 27/28/30 LMi, and thus also easy to find. HJL1057 also in field to southwest.
Delicate colour contrast in the triangle makes this a very attractive field: 30 LMi is yellowish-white, 28 reddish-white, 27 LMi colder.
In 15x45 binoculars STTA104 becomes almost too wide to feel it is a double, but the colour contrasts in the triangle become clearer.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Very wide pair of similarly bright components, unremarkable color. The double star stands close to the stars 27, 28 & 30 LMi and is probably more appealing in smaller binoculars. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_stta104.jpg
STF1429 9m.1 9m.3 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
POU3080 9m.7 10m.9 5.7" 102° 2015 Leo 10h25m29.14s / +23°21'38.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Light orange-yellow A and ~1.5 delta mag B, white, well separated
HU877 9m.1 10m.5 1.7" 250° 2015 LMi 10h25m32.60s / +36°46'59.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very fine white pair, ~2 delta mag, ~2" separation, very nice
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist nur phasenweise klar zu trennen, bei einem Helligkeitsunterschied von ca. 1,5 mag.
STF1431 7m.8 9m.1 3.6" 76° 2019 Leo 10h25m35.12s / +08°46'35.40"
Robert Zebahl
Leipzig (Germany)
70mm (67x) Separable at 67x, but very close together with a clear difference in brightness. Easy to separate at 100x. Next to it the star 44 Leo shines in a striking, bright orange.
René Merting
Drachhausen (Germany)
100mm (104x) bei 64x ist B nordöstlich von A erkennbar, beide bilden eine 8, wobei so schwach ist, dass die 8 gewöhnungsbedürftig ist - bei 107x ist B dann knapp getrennt erkennbar - Helligkeitsunterschied eine Größenklasse - verschönert wird die Szenerie durch den unmittelbar westlich stehenden orange strahlenden Stern 44 Leo
Uwe Pilz
Leipzig (Germany)
105mm (88x) nahe 44 Leo
Mark McCarthy
Fremont (California/USA)
178mm (205x) Delicate light blue pair, >1 delta mag, 3" separation, not far from a bright light orange star 44 Leo. Very pretty view
STF1428 8m.0 8m.4 2.8" 89° 2018 UMa 10h25m59.00s / +52°37'18.30"
Mark McCarthy
Fremont (California/USA)
178mm (205x) An attractive pair, clean white stars about 1 delta mag and 3". Physical
STT217 7m.8 8m.6 0.8" 151° 2019 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
STF1434 9m.5 9m.7 6.5" 282° 2019 Leo 10h27m08.41s / +18°03'44.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal white, wide
HJ832, 45 Leo 6m.0 12m.4 37.8" 132° 2019 Leo 10h27m38.99s / +09°45'44.70"
Uwe Pilz
Leipzig (Germany)
105mm (260x) nicht schwierig
HU879, bet LMi 4m.6 6m.0 0.5" 226° 2018 LMi 10h27m53.09s / +36°42'26.90"
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
STF1435 10m.3 10m.7 8.5" 203° 2021 Leo 10h27m57.15s / +19°49'44.70"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Faint for a Struve, but easy white stars, wide, about half a delta mag. Physical
A2152 AB 9m.6 9m.1 0.4" 57° 2008 LMi 10h28m58.56s / +34°51'48.00"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Marginal. Momentary glimpses of a fine point very nearly a hairline split. Pretty orange star, slightly fainter
STF1438 9m.6 11m.1 2.5" 276° 2016 Leo 10h29m13.82s / +13°08'59.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair, B is wide and seen with averted vision only. Not physical
HEI762 10m.5 11m.4 2.6" 145° 2017 Sex 10h29m59.21s / +05°42'37.30"
Mark McCarthy
Fremont (California/USA)
508mm (333x) B just hangs in there with direct vision, flashes brighter with averted vision. ~2.5" ~1 delta mag
STF1439 8m.3 8m.9 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
ES1905 AB 8m.6 12m.6 41.6" 68° 2015 UMa 10h30m16.09s / +63°20'55.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White with 3x fainter, 11th mag, B. Very wide.
STF1436 8m.8 10m.4 10.5" 254° 2016 UMa 10h30m22.86s / +56°21'20.00"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Slightly dimmer than a typical Struve, about 2 delta mag, very wide
STF1441 AB 6m.5 8m.8 2.8" 167° 2015 Sex 10h30m58.78s / -07°38'15.20"
AC 6m.5 10m.1 61.7" 315° 2015
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 107x ploppt südlich ganz dicht ein schwacher Stern auf - bei 142x ist B dann deutlicher und knapp getrennt erkennbar - A ist gelblich und strahlt etwas von seiner Färbung auf B ab
AC: bei 32x ist C nordwestlich von A erkennbar - C steht gut abgesetzt und ist mindestens 3 Größenklassen schwächer
HU880 10m.1 10m.4 0.9" 144° 2017 LMi 10h31m14.44s / +37°07'27.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Exceptionally fine split, white stars
HJ482, 33 LMi AB 5m.9 11m.8 58.4" 246° 2017 LMi 10h31m51.36s / +32°22'46.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 33 LMi. Very bright A, with widely separated, very faint B.
Karsten Kopp
Köln (Germany)
600mm (180x) Bei diesem Doppelstern liegt die Herausforderung beim sehr großen Helligkeitsunterschied von gut 6 mag. Komponente A strahlt schön weißlich.
STF1442 8m.2 8m.5 13.3" 157° 2017 Leo 10h31m58.95s / +22°02'22.00"
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2021-04-21: At 22x outstanding with similar bright components and moderate separation, slightly different in color. Assignment of colors was difficult. At 44x improved color impression: dark orange & ice blue.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x schön anzusehen - ein eng stehendes Pärchen mit einem kaum spürbaren Helligkeitsunterschied - leichter Farbkontrast, der nicht wirklich greifbar ist - zurück auf 20x sind beide Sterne auch noch knapp getrennt erkennbar
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal white with a hint of yellow, wide. [not physical]
Berthold Fuchs
Wiesbaden (Germany)
130mm difficult DS ../projects/double-stars/berthold-fuchs/photographs/STF%201442.png
HDS1511 7m.5 9m.1 0.1" 19° 2012 Leo 10h32m17.36s / +24°26'32.10"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Out of round olive, airy disk swimming in diffraction
STF1443 9m.9 10m.0 5.3" 161° 2018 LMi 10h33m17.07s / +37°40'25.00"
Robert Zebahl
Leipzig (Germany)
120mm (50x) At 50x split with little distance. At 75x clearly split with small difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) White, near equal, 3-4"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Wide pair, white, ~1 delta
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern mit identischer Helligkeit. Beide Sterne leuchten weißlich.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201443.png
STF1446 9m.3 10m.0 5.5" 250° 2018 Leo 10h33m33.32s / +15°12'49.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Fairly faint for a Struve, 1 delta mag, pretty wide, white. Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Two faint stars, pretty well separated, 1 delta mag.
STF1447 7m.5 8m.9 4.6" 124° 2019 Leo 10h33m47.28s / +23°21'02.40"
Robert Zebahl
Leipzig (Germany)
70mm (67x) 2020-04-10: With 44x very tight, uneven pair. The primary component appears whitish with a very faint companion. At 67x the faint companion is clearly visible, but still standing close to the primary component.
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist Komponente B ganz schwach südöstlich von A knapp abgesetzt zu erkennen - Helligkeitsunterschied 2-3 Größenklassen (lt. Stelle Doppie nur 1.36 mag)
Mark McCarthy
Fremont (California/USA)
317mm (277x) Both white, A (7.5) 2x brighter than B (8.9). Wide separation (4").
Mark McCarthy
Fremont (California/USA)
508mm (333x) Nice pair of yellow stars, ~1.5 delta mag, wide
HU1338 & STF1448 HU1338 AB 7m.5 13m.6 3.5" 184° 1920 Leo 10h34m23.24s / +21°35'36.40"
STF1448 AC 7m.5 9m.6 11.0" 260° 2017
Robert Zebahl
Leipzig (Germany)
70mm (44x) STF1448 (AC): 2020-04-10: Moderate separation, significant difference in brightness. A shows a beautiful bright orange, C as a faint greyish companion.
René Merting
Drachhausen (Germany)
100mm (32x) STF1448 (AC): bei 32x zeigt sich Komponente C im NW von A knapp getrennt - C ist nur ein Hauch von einem Stern - Helligkeitsunterschied enorm, ich schätze 3 Größenklassen (nur 2 mag laut Stelle Doppie)
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1448 (AC): Pretty orange and blue pair, 2 delta mag, ~10"
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1448 (AC): An orange and blue pair. Fainter than Alberio but just as pretty.
STF1450, 49 Leo 5m.8 7m.9 2.0" 157° 2019 Leo 10h35m02.16s / +08°39'01.60"
Robert Zebahl
Leipzig (Germany)
70mm (133x) B component appeared as clear brightening on the first diffraction ring of the primary component in the correct position angle.
Uwe Pilz
Leipzig (Germany)
105mm (200x) Begleiter klebt am ersten Ring
Mark McCarthy
Fremont (California/USA)
317mm (277x) White and slight yellow, ~6-7", nice pair.
Mark McCarthy
Fremont (California/USA)
508mm (333x) 49 Leo. Striking pair, light yellow A and a richer orange-yellow B, ~2.5 delta mag, well split
STF1451 AB 9m.5 10m.7 8.5" 271° 2016 Leo 10h35m24.86s / +26°16'09.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy pair, wide, ~1 delta mag
STF1454 9m.0 11m.0 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.
STF1456 8m.2 9m.8 13.7" 45° 2016 Sex 10h38m17.33s / +01°14'38.40"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schön eng stehendes, gut getrenntes Sternpaar - A weiß, B im NO leicht bläulich - Helligkeitsunterschied 1.5 Magnituden
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy bright pair, almost 2 delta mag, wide light orange stars
STT222 7m.0 11m.7 4.0" 339° 2016 UMa 10h38m19.89s / +60°07'30.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extremely faint star, B seen with averted vision, PA to north.
STF1457 7m.7 8m.2 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
J79 9m.0 10m.1 1.4" 135° 2018 Leo 10h38m54.93s / +07°21'26.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very nice, ~2 delta mag, close ~2" separation, blue-white stars
BAR39 10m.7 12m.2 1.1" 289° 1959 Leo 10h39m21.56s / +22°28'02.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) B appears with averted vision, very tight
STT225 AC 8m.5 10m.4 6.5" 357° 2017 Leo 10h40m03.23s / +19°14'25.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very light yellow-orange A and ~2 delta mag, wide B. Did not see PER 2 AB, 8.53/10.60 0.4"
STF1459 8m.3 8m.8 4.6" 153° 2019 LMi 10h40m12.46s / +38°24'11.40"
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x muss ich sehr genau hinschauen, dann ist eine kleine 8 zu erkennen - bei 64x zeigen sich dann beide Sterne knapp getrennt - Komponente B im SO nicht ganz so glänzend weiß wie A
Robert Zebahl
Leipzig (Germany)
120mm (50x) Clearly split with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow-orange, 0.5 delta mag, 5-6".
Mark McCarthy
Fremont (California/USA)
508mm (333x) Wide light yellow-orange stars, ~2 delta
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern mit leichtem Helligkeitsunterschied. Beide Komponenten leuchten gelblich weiß.
STF1460 8m.7 8m.9 3.9" 161° 2019 UMa 10h40m35.04s / +42°09'11.60"
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-19: At 44x clearly visible as '8', overall quite faint and almost separated. The components seemed equally bright. At 57x separated, equally bright.
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very pretty near equal pair of white stars, well separated about 5". Not physical
J1369 10m.1 11m.7 7.5" 121° 2017 Sex 10h41m02.02s / +03°35'46.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy, ~2 delta mag, pretty wide [I didn't think it would be physical but it is]
STF1464 AB 8m.3 10m.3 5.8" 302° 2016 Sex 10h41m35.43s / -00°16'20.80"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Light yellow A and blue B, pretty wide, attractive pair. Likely part of plus one [STF 1464 AC 8.26/10.51 66.7"]
STT227 8m.3 8m.8 0.9" 2017 Leo 10h41m41.58s / +10°44'22.30"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Faint reddish pair, near equal, just split but hazy, poor view.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pure white stars, ~1" separation, ~2 delta mag, very fine and striking
A2483 9m.4 11m.4 2.0" 225° 2016 Leo 10h42m08.09s / +16°17'03.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Wow, very fine ~2 delta mag, ~2" separation. Very much fainter B about as faint as can be before needing averted vision
A2768 6m.9 8m.4 0.6" 238° 2019 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
STF1462 AB 7m.4 10m.1 8.1" 174° 2016 UMa 10h42m52.23s / +50°47'57.30"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White A, very faint B, wide
STF1463 9m.3 10m.4 7.9" 258° 2018 UMa 10h42m54.25s / +46°41'25.20"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Dim pair, significant magnitude difference, white, fairly wide. Physical
BU913, 40 LMi AB 5m.5 12m.6 23.8" 108° 2015 LMi 10h43m01.95s / +26°19'32.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 40 LMi: Bright A, very faint B, very wide separation. B looks like a ghost.
Karsten Kopp
Köln (Germany)
600mm (180x) Leicht zu trennender Doppelstern mit sehr großem Helligkeitsunterschied. Komponente B ist schon mit 12,6 mag sehr schwach.
STF1465 9m.8 10m.1 2.2" 11° 2019 UMa 10h43m13.35s / +44°37'41.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair, considerable magnitude difference, fairly wide
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal well split ~3". 9th-10th mag.
STF1466, 35 Sex AB 6m.2 7m.1 6.8" 240° 2019 Sex 10h43m20.91s / +04°44'51.60"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein wunderschönes dicht stehendes Pärchen, knapp getrennt - Helligkeitsunterschied eine halbe Größenklasse - leichter Farbkontrast, A leicht gelblich
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very nice view. At 28x obviously unequal and easy to split. A appeared slightly orange. At 86x B appeared grey-blue. ../projects/double-stars/robert-zebahl/sketches/2019-04-06_35_sex.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Orange and a little blue, wide separation, bright, half a delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (333x) 35 Sex. Easy, wide, yellow-orange pair, ~2 delta mag. AC much further separated and 1 delta mag. [SkyTools showed a close CD pair: Hint of elongation with 533x, elongation is larger but more hazy at 1067x, but not resolved into stars -- but this one not in Stelle Doppie.]
SMA75 AB 5m.2 7m.3 288.0" 88° 2018 UMa 10h43m32.89s / +46°12'13.90"
AC 5m.2 11m.1 152.0" 16° 2018
AD 5m.2 9m.2 381.6" 45° 2018
BD 7m.3 9m.2 259.2" 357° 2018
Christopher Hay
Seeheim (Germany)
7x45 AB: Wide apart and large delta-mag, but still very much belonging together. No particular colour impression.
Smart 75 AB (also known as Shaya (SHY) 216) is a physical double at a distance to us of 121 light years. This is incidentally almost exactly the same distance to us as Alpha UMa AC, a further wide binocular pair in UMa.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Wide 80mm finder pair, white and slight yellow. In the scope there are some more faint stars about, so it is likely a small cluster -- 7 stars in the system.
A2771 9m.2 9m.7 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
STF1468 9m.7 9m.7 4.4" 334° 2019 Leo 10h44m39.96s / +20°42'18.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint near equal, close but a nice split
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal white stars, wide
STF1467 8m.6 10m.8 3.9" 288° 2018 UMa 10h45m15.60s / +44°58'11.20"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Nice! Very faint B, around 2 delta mag, pretty wide. I can just see B with direct vision and hold it in poor transparency. Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange star with extremely faint wide split B. Needed averted vision to notice it as a smudge but could see it with direct vision as a small blue point when seeing stills. ~2 delta mag.
42 LMi S612 AB 5m.3 7m.8 196.4" 174° 2019 LMi 10h45m51.91s / +30°40'56.60"
ARN3 AC 5m.3 8m.3 424.6" 94° 2013
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Panning around in the area the triangle of ABC is immediately striking. Component A cold-white, B reddish, C no particular colour.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Wide, striking triple system, which can be well observed with binoculars. A: quite bright, rather white, B: slightly orange, C: tending to orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_42_lmi.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) AB: Very widely separated, split in finder (196"!). white A with a slightly red B
STT228 8m.2 8m.9 1.7" 170° 2017 Leo 10h47m16.93s / +22°34'32.00"

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) 2021-04-21: Slightly elongated.
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
STF1473 AB 7m.7 8m.9 30.5" 10° 2015 Hya 10h47m36.55s / -15°37'36.10"
AC 7m.7 12m.5 96.1" 333° 2020
Christopher Hay
Seeheim (Germany)
25x80 AC: Wide apart, no particular colour impression. Visually unspectacular, STF1474 is much more commanding in the field of view.
A physical double at a distance to us of 271 light years.
STF1474 AB 6m.7 7m.0 65.9" 28° 2017 Hya 10h47m37.93s / -15°15'42.90"
AC 6m.7 7m.6 72.6" 27° 2017
BC 7m.0 7m.6 6.6" 15° 2020
Christopher Hay
Seeheim (Germany)
7x50 AB: On tripod. Distinctly apart. Component A appears orangish at first sight, but the impression fades quickly. A nice matched pair. Luminous-red variable red giant star U Hydrae enhances the 7.3° FOV at its north-western margin.
Christopher Hay
Seeheim (Germany)
25x80 AB: So far apart that they do not make the impression of a double. A is bluish, no particular colour impression of BC.
BC: Hairfine split. The visual impression of ABC is not so much that of a triple system, rather more like a "double in a double".
STF1469 AB 7m.7 10m.4 10.9" 324° 2016 UMa 10h47m43.86s / +65°27'36.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White and 2x fainter B, wide.
★★ STT229 7m.6 7m.9 0.7" 256° 2020 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"
A2572 9m.8 10m.1 0.8" 121° 2016 Sex 10h48m48.88s / +01°24'12.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Hairline split, white, near equal
STF1476, 40 Sex 7m.1 7m.8 2.4" 17° 2017 Sex 10h49m17.31s / -04°01'23.80"
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-03-31: At 67x very tightly separated, uneven pair. Also at 100x still rather close together. The companion appears only as a tiny star.
René Merting
Drachhausen (Germany)
100mm (107x) bei 64x ist meist eine schöne 8 zu erkennen, manchmal aber auch nur ein Stäbchen - bei 107x zeigt sich B im Norden von A knapp abgetrennt - geringer Helligkeitsunterschied
Mark McCarthy
Fremont (California/USA)
317mm (340x) Tight white of equal brightness
A2370 9m.9 10m.9 2.7" 335° 2017 Leo 10h49m34.11s / +16°30'24.90"
Mark McCarthy
Fremont (California/USA)
508mm (333x) (Red giant branch star) Very nice, white A and B blue for faintness, very clear, widely split, ~ 2 delta mag
A2371 9m.8 11m.0 2.7" 320° 2017 Leo 10h49m45.93s / +18°05'09.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Nice ~2 delta mag pair, ~2.5" separation. [not physical]
A2373 8m.8 8m.8 0.2" 228° 2011 Leo 10h52m02.94s / +16°05'44.00"

../images/binary-star-orbits/A2373-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (889x) Just split hairline at best moments, touching disks otherwise, 1 delta mag, very tough. In my notes I put the PA to the NNE, but this is a reversal of what is listed as SE. 100.26-year period, 0.218" now, it will make a barely perceptible arc to the south in the next couple of decades
STF1482 8m.2 9m.2 12.0" 305° 2017 Leo 10h52m10.61s / +07°27'39.40"
René Merting
Drachhausen (Germany)
18x70 zunächst ist ein längliches Stäbchen erkennbar, in guten Momenten maximal eine 8, aber nur im Ansatz
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2021-04-21: At 22x very nicely separated with moderate brightness difference. A slight color difference was visible, which improved at 44x: mild orange & slightly bluish.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein enges Pärchen, knapp getrennt - Helligkeitsunterschied eine dreiviertel Größenklasse - A strahlt warmweiß, B reinweiß
Mark McCarthy
Fremont (California/USA)
178mm (205x) Very light orange, wide, 1 delta mag. Physical
René Merting
Drachhausen (Germany)
320mm (72x) bei 144x ordentlich getrennt - Komponente A im Südosten ist weißgelb, B ist eine dreiviertel Größenklasse schwächer und weißbläulich - zurück auf 72x wirkt B farblich noch kühler - weiterhin gute Trennung zwischen beiden Sternen
HO376 9m.9 11m.1 3.0" 218° 2012 Leo 10h52m40.84s / +23°12'03.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) White A, B just seen direct, wide ~4", decent pair
S617 6m.2 8m.7 35.2" 179° 2017 Leo 10h53m24.96s / -02°15'18.80"
René Merting
Drachhausen (Germany)
18x70 unauffällig - Komponente B ist ordentlich getrennt südlich von A erkennbar - Helligkeitsunterschied eine Magnitude (2.49 mag lt. Stelle Doppie!) - A reinweiß, B grau
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-03-31: Clearly separated with distinct difference in brightness. Color wise unremarkable. Nearby there is a brighter star. ../projects/double-stars/robert-zebahl/sketches/2020-03-31_s617.jpg
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ist B im Süden von A mit ordentlich Abstand erkennbar - A ist warmweiß, leicht gelblich, die deutlich schwächere Komponente B wirkt farblos - das Sternpaar ist interessant in Kombination mit dem unmittelbar nordöstlich stehenden gelblich strahlenden Stern Rho? Leo
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A, blue B, wide separation
STF1483 9m.5 9m.6 2.3" 243° 2019 UMa 10h54m30.84s / +47°29'35.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Two near equal wide split, fairly faint, 9.5 mag.
STT230 8m.7 11m.9 9.2" 40° 2015 Leo 10h54m32.46s / +20°46'22.90"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Cool effect of B appearing with averted vision like a meteor out of the corner of my eye. Wide. [not physical]
SKF59 7m.4 11m.5 34.1" 59° 2016 LMi 10h54m44.78s / +36°45'31.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-yellow star with very wide separated very faint B, need averted vision.
BU597 9m.2 10m.1 1.0" 45° 2016 Leo 10h54m49.70s / +23°45'20.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) ~2 delta mag and ~1" separation, light orange stars, very steady images. Really nice
STF1486 8m.4 9m.7 31.6" 100° 2015 UMa 10h55m01.14s / +52°07'18.20"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x einfach, ordentliche Trennung - Komponente B im Osten ist halb so hell wie A - eigenartiger Farbkontrast, B wie so oft grau, aber A ist orangebraun - zurück auf 20x sind beide Sterne auch noch gut getrennt erkennbar
STF1487, 54 Leo 4m.5 6m.3 6.6" 112° 2020 Leo 10h55m36.80s / +24°44'59.00"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x split, but very tight with noticeable difference in brightness. At 71x easy to separate. No visible color difference.
Robert Zebahl
Leipzig (Germany)
70mm (67x) 2021-04-13: At 67x beautifully separated with clearly visible difference in brightness. Very attractive is the subtle color difference: light yellow & light blue. At 133x the color of the companion is a bit more pale: grey-blue. The primary component still shines in a beautiful light yellow.
Winfried Kräling
Marburg (Germany)
127mm (250x) 13.03.2017: Hauptkomponente gelblich, Begleiter bläulich, deutlicher Helligkeitsunterschied. Ebenfalls bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_03_54%20Leo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white pair (4.5, 6.3) wide sep (6")
Mark McCarthy
Fremont (California/USA)
508mm (333x) 54 Leo. Brilliant pair, light white-yellow stars, ~2 delta mag, wide
BRT2405 11m.4 11m.9 4.2" 222° 2016 Leo 10h56m44.65s / +22°15'27.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) A is a blue star, B appearing with averted vision
STF1492 8m.0 10m.2 21.6" 165° 2017 LMi 10h57m35.85s / +30°39'09.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 3 delta mag white with widely separated B
Karsten Kopp
Köln (Germany)
600mm (180x) Leichter Doppelstern mit einem Helligkeitsunterschied von ca. 2,0 mag.
STF1491 AB 8m.4 11m.3 14.1" 33° 2017 UMa 10h58m50.42s / +61°42'56.40"
Mark McCarthy
Fremont (California/USA)
178mm (205x) A is a light yellow, B not seen with direct at first, but it flashes brightly with averted vision, and I then can hold it direct. Very well split, three delta. Physical
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange and blue, pretty wide, ~3 delta mag.
STF1495 7m.2 8m.8 33.8" 36° 2017 UMa 10h59m49.47s / +58°54'23.30"
René Merting
Drachhausen (Germany)
18x70 ein komfortabel getrenntes Sternpaar mit leichtem Farbkontrast - B steht versetzt nördlich von A und ist 1.5 bis 2 Magnituden schwächer
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein weit getrenntes Paar - Komponente B im NO ist knapp zwei Magnituden schwächer - A strahlend weiß, B die graue Maus, wie es sich gehört für die schwächere Komponente - zurück auf 20x immernoch ordentliche Trennung, der Helligkeitsunterschied wirkt nicht mehr ganz so groß
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x weit getrennt - ein schönes farbiges Kontrastpaar - Komponente B im NO ist gut 1.5 Größenklassen schwächer und strahlt kupfergrau, A dagegen ist weißgelb
STF1500 7m.9 8m.3 1.2" 301° 2019 Leo 11h00m02.02s / -03°28'16.50"

../images/binary-star-orbits/STF1500-orbit.jpg

Mark McCarthy
Fremont (California/USA)
178mm (205x) Very fine white stars, ~1 delta, ~1.5". Physical with a 680-year period
AG173 9m.9 10m.5 2.2" 127° 2016 Leo 11h00m32.39s / +02°58'09.20"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Faint pair, rather difficult given the poor transparency, white, ~1 delta mag, ~2-3"
WEI26 9m.5 10m.0 14.2" 174° 2016 Leo 11h01m12.86s / +21°05'28.90"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Dual white stars, near equal, wide
UC2059 & HDS1574 & COU1422 HDS1574 Aa-Ab 7m.6 11m.1 0.3" 99° 2019 UMa 11h01m45.73s / +36°40'41.60"
UC2059 AB 7m.5 10m.7 46.6" 46° 2015
COU1422 Ba-Bb 11m.2 11m.5 0.7" 47° 2016

../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.
COU961 AB 7m.2 9m.4 1.3" 326° 2018 LMi 11h01m49.33s / +29°52'16.60"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Very close, tough split, ~2 delta, ~1" separation, light orange A. [Did not notice CHR 34 Aa,Ab 0.3"]
STF1502 9m.5 10m.4 12.9" 285° 2016 Leo 11h02m01.28s / +14°37'14.70"
Mark McCarthy
Fremont (California/USA)
178mm (205x) 1 delta mag, wide, white A and light blue B. Physical
STF1503, AM Leo 9m.4 11m.1 11.6" 271° 2016 Leo 11h02m10.88s / +09°53'42.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Double double with HJ 172. Physical
HJ172 10m.2 10m.3 13.6" 94° 2016 Leo 11h02m12.14s / +09°44'59.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Double-double with STF 1503. I wonder how either observer could have missed the other pair, they're identical. Physical. Checking GAIA EDR3, I find the two A stars are not physical (different PM)
A1590 8m.9 9m.6 1.5" 328° 2017 UMa 11h03m27.91s / +54°31'33.00"

../images/binary-star-orbits/A1590-orbit.jpg

Mark McCarthy
Fremont (California/USA)
178mm (205x) Light orange A and blue-green B, >1" separation, half delta mag. Physical with 163-year period, it's not at apastron and won't make significant change for several decades
★★ BU1077, alpha UMa, 50 UMa, Dubhe AB 2m.0 5m.0 0.8" 342° 2017 UMa 11h03m43.84s / +61°45'04.00"
AC 2m.0 7m.2 384.5" 206° 2020

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

Christopher Hay
Seeheim (Germany)
7x45 AC: AC: Very wide apart but still feel as if belonging together. A golden-yellow, C seems blue, a very attractive pair.
A, B and C are a physical triple system at a distance to us of 123 light years. This is incidentally almost exactly the same distance to us as SMA75 AB, a further wide binocular pair in UMa.
René Merting
Drachhausen (Germany)
18x70 AC: Dubhe oder Alpha Ursae Majoris - hm, naja - C zeigt sich im Süden in Riesenabstand zum intensivgelbem A - Komponente C wirkt dagegen wie eine graue Maus und der Helligkeitsunterschied ist so enorm, dass er nicht abschätzbar ist
Christopher Hay
Seeheim (Germany)
36mm (8x) A wide pair but still appearing visually to belong together. Component A is a creamy gold-white. Component C is pale blue, but the colour impression fades after looking for a while. In parallel observation with 3-inch at 32x and 7-inch at 67x I see no particular colour of C, an interesting difference to observation with one-and-a-half-inch. I take a look with 7x42 binoculars and the blue impression is there again, as always with binoculars of all kinds.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: 2020-04-07: Very wide, uneven & inconspicuous pair. A appeared white-yellowish, for C I could not detect any color.
Uwe Pilz
Leipzig (Germany)
120mm (120x) ../projects/double-stars/uwe-pilz/sketches/220409Dubhe_SApo_140.jpg
Robert Zebahl
Leipzig (Germany)
152mm (43x) AC: 2022-04-12: Very wide and uneven pair. Component A shines in a bright, brilliant orange, companion C looks rather white.
Robert Zebahl
Leipzig (Germany)
152mm (200x) AB: 2022-04-12: At magnifications between 200x and 400x, there was nothing even close to a double star to be seen. The air was simply too turbulent.
STF1504 7m.9 8m.1 1.2" 126° 2018 Leo 11h03m58.93s / +03°38'19.30"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-03-31: The double star might have appeared slightly elongated. But observation is too uncertain.
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-28: At 125x clearly visible as figure '8'. Both components appeared similarly bright. At 160x and 187x the diffraction disks were touching each other slightly.
Mark McCarthy
Fremont (California/USA)
178mm (205x) Lovely split, small scale at this magnification, white stars, <1 delta mag, very clean image with seeing
Mark McCarthy
Fremont (California/USA)
317mm (553x) White near equal, ~2", nice.
HZG8, 51 UMa AC 6m.0 7m.6 150.1" 83° 2017 UMa 11h04m31.28s / +38°14'28.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very wide separation 1.5" mag. This is AC of 51 UMa, AB is Ho 377 which is 6.04,11.60 and 8.2"
HO49 8m.4 11m.6 7.5" 356° 2016 UMa 11h04m46.60s / +56°59'31.80"
Mark McCarthy
Fremont (California/USA)
178mm (205x) White A and faint B which appears consistently with averted vision, but I can't hold it direct even with foveal coaxing. Well separated, 2 delta mag. Physical
★★ HO378 AB 8m.2 9m.1 1.1" 234° 2020 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.
KUI54, chi Leo AB 4m.7 11m.0 4.9" 268° 2018 Leo 11h05m01.02s / +07°20'09.60"
Mark McCarthy
Fremont (California/USA)
178mm (205x) Nice! B is a tiny sharp point separated pretty well from bright A
A2378 9m.9 9m.8 0.4" 140° 2017 Leo 11h05m20.40s / +16°35'21.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Split with seeing, near equal, white
WX UMa VBS18 AB 8m.8 14m.6 32.0" 125° 2017 UMa 11h05m27.65s / +43°31'38.70"
CSN7 AC 4m.8 7m.5 7.3" 168° 2003
Robert Zebahl
Leipzig (Germany)
70mm (100x) AC: 2020-03-31: Not identifiable at magnifications between 22x and 100x. WX UMa (component A?) is a variable (b14m2-16m53) and probably too faint.
STF1505 AB 8m.9 10m.6 8.2" 312° 2016 UMa 11h05m41.23s / +62°37'01.50"
AC 8m.9 12m.0 217.7" 177° 2015
Robert Zebahl
Leipzig (Germany)
70mm (80x) AB: 2020-04-14: Easy split with pretty dim companion.
Mark McCarthy
Fremont (California/USA)
178mm (205x) AB: Very light orange A, and faint B can just hold direct vision, brightens with averted vision, well split, 2 delta mag. Physical
STF1507 8m.8 10m.2 8.5" 165° 2016 Leo 11h06m07.42s / +07°02'00.50"
Mark McCarthy
Fremont (California/USA)
178mm (205x) 2 delta mag, pretty wide. Physical, unusual for one so wide
★★ BU599, 65 Leo 5m.7 9m.7 2.8" 107° 2016 Leo 11h06m54.20s / +01°57'19.90"