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 538
Visual Observations 868
Sketches 85
Photographs 9
Observers 11
Berthold Fuchs, Sarah Gebauer, Christopher Hay, Gerd Kohler, Winfried Kräling, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000)
SIN128 AC 7m3 7m6 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!?
BU16, 3 Mon 5m0 8m0 1.9'' 355° 1996 Mon 06h01m50.42s -10°35'52.60"
Uwe Pilz
Leipzig (Germany)
105mm (260x) schwache Aufhellung im ersten Ring ../projects/double-stars/uwe-pilz/sketches/3Mon.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter schwach ../projects/double-stars/uwe-pilz/sketches/bu16.jpg
HDS824 8m2 9m2 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 9m8 10m0 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 8m4 9m5 1.3'' 271° 2015 Ori 06h04m08.29s +11°00'57.00"

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

Mark McCarthy
Fremont (California/USA)
203mm (205x) White A, B resolves with seeing, hairline split and two delta mag. Tough at this aperture
HO228 7m7 10m2 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 7m2 8m9 21.5'' 248° 2014 Ori 06h06m28.04s +10°45'01.00"
BC 9m8 10m1 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.
STT131 7m0 9m4 1.5'' 277° 2012 Aur 06h07m25.84s +36°16'28.70"
Mark McCarthy
Fremont (California/USA)
317mm (270x) Very close, need seeing to resolve 2 delta mag white A and light blue B
STF851 8m9 9m5 2.6'' 33° 2018 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 7m2 9m6 1.8'' 332° 2012 Aur 06h08m11.68s +37°58'57.90"

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

Mark McCarthy
Fremont (California/USA)
317mm (270x) White A and slightly red B. Fine pair. 2 delta mag.
STF844 AB 8m5 9m3 23.4'' 10° 2017 Ori 06h08m18.38s +13°59'50.30"
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 6m9 9m3 3.6'' 192° 2019 Mon 06h08m25.39s -11°08'46.60"
AC 6m9 10m8 10.2'' 260° 2015
BC 9m3 10m8 9.3'' 276° 1998
Uwe Pilz
Leipzig (Germany)
105mm (288x) Dreifachstern! (Burnham 17) ../projects/double-stars/uwe-pilz/sketches/bu17.jpg
STF848 AB 7m3 8m2 2.6'' 110° 2019 Ori 06h08m30.36s +13°58'15.80"
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) Well split with obvious difference in brightness.
Christopher Hay
Seeheim (Germany)
125mm (100x) 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) 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) Close bluish pair near the center of the open cluster NGC 2169
STF854 8m8 9m8 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 9m2 9m5 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 AB 7m5 9m1 31.0'' 189° 2015 Gem 06h09m15.94s +24°25'40.30"
René Merting
Drachhausen (Germany)
100mm (32x) 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)
COU1101 10m8 10m8 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
STF869 8m2 9m1 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 8m6 9m8 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 6m2 6m9 7.6'' 357° 2018 Aur 06h11m36.59s +48°42'39.60"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Relatively tight with visible difference in brightness.
J2016, xi Ori AB 4m4 13m0 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 9m6 9m8 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 8m5 8m6 1.0'' 209° 2012 Ori 06h13m27.53s +10°14'52.40"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Very fine hairline split, near equal. Nice!
STF877 7m5 8m0 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 3m5 6m2 1.8'' 258° 2017 Gem 06h14m52.69s +22°30'24.60"

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

Uwe Pilz
Leipzig (Germany)
105mm (260x) Aufhellung im ersten Ring
Uwe Pilz
Leipzig (Germany)
105mm (288x) sehr schwierig ../projects/double-stars/uwe-pilz/sketches/etaGem.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) Already comparatively easy at 180x. The faint companion can be seen well as a quite distinct, slightly elongated, partly round brightening. At 225x and above it becomes easy and immediately apparent, even if the diffraction rings of the primary component are not permanently visible due to the seeing. The primary component was shining in a bright orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Propus. Yellow A and blue-yellow B, 2 delta mag, 1.5" very nice
A2446 9m0 11m5 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 8m4 8m7 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 6m9 7m4 11.3'' 215° 2017 Aur 06h15m39.06s +36°08'55.30"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Well separated with significant difference in brightness.
J686 10m5 10m7 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
H5 55 7m0 10m8 62.1'' 59° 2015 Gem 06h19m22.52s +23°16'28.20"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 12 Geminorum: Very wide separation, ~3 delta mag, fairly faint.
AG109 9m4 9m7 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 9m0 10m2 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 9m5 10m8 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 7m6 9m9 21.3'' 244° 2015 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 11m2 11m4 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
STTA75 7m7 8m9 47.1'' 129° 2015 Ori 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 7m1 8m9 57.4'' 265° 2015 Gem 06h20m36.35s +25°11'20.40"
René Merting
Drachhausen (Germany)
18x70 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) bei 32x weit getrennt - Komponente B im SW ist 1.5 Magnituden schwächer und wirkt farblos gegen die weiß strahlende Komponente A
S513 AB 7m3 8m9 59.4'' 258° 2014 Gem 06h21m14.48s +21°07'56.70"
René Merting
Drachhausen (Germany)
18x70 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) 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 5m5 9m7 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 9m0 9m6 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 6m1 7m7 0.6'' 149° 2016 Lyn 06h22m03.57s +59°22'19.50"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig wegen Helligkeitsunterschied
STF899 7m4 8m0 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 10m9 11m9 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
STF900, epsilon Mon, 8 Mon AB 4m4 6m6 12.0'' 29° 2017 Mon 06h23m46.10s +04°35'34.20"
Robert Zebahl
Leipzig (Germany)
55mm (42x) Relatively large distance and clear difference in brightness. The lighter component seemed white-yellowish, the weaker one slightly greenish-blue. The color contrast, however, was not particularly conspicuous.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Blau-rot ../projects/double-stars/uwe-pilz/sketches/epsMon.jpg
STT140 AB 6m9 10m1 3.0'' 119° 2012 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 6m3 9m2 21.0'' 298° 2017 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 9m8 9m9 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 10m3 10m9 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 AB 6m7 8m2 25.0'' 202° 2017 Gem 06h27m46.58s +20°47'22.60"
René Merting
Drachhausen (Germany)
18x70 ein schönes enges Sternpaar, Komponente B ist SW ist ordentlich getrennt von A zu erkennen - etwas über eine Größenklasse Helligkeitsunterschied, dadurch leichter Farbkontrast
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very pretty orange A, with a brown B, ~1.5 delta mag.
J1092 AB 11m6 12m5 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 4m6 5m0 7.1'' 133° 2017 Mon 06h28m49.07s -07°01'59.00"
STF919 AC 4m6 5m4 9.8'' 125° 2018
STF919 BC 5m0 5m3 2.6'' 108° 2018
BU570 AD 4m6 12m1 26.5'' 56° 2014
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
STT141 AB 7m7 9m8 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"
WEI12 8m6 8m7 8.6'' 66° 2015 Gem 06h31m08.66s +21°43'06.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal white, wide, unremarkable
STT143 & FOX147 STT143 AB 6m2 10m1 7.9'' 103° 2015 Gem 06h31m09.99s +16°56'19.00"
FOX147 AC 6m2 11m4 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
FAB5 & STF926 FAB5 Aa-Ab 7m2 9m6 0.9'' 18° 1991 Mon 06h31m40.54s +05°46'08.80"
STF926 AB 7m2 8m6 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 10m6 10m6 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 6m3 6m9 20.7'' 212° 2017 Gem 06h32m18.52s +17°47'03.40"
BC 6m9 13m0 47.8'' 144° 2014
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, decent 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 7m3 9m9 1.5'' 338° 1991 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 9m5 9m9 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 7m3 8m2 4.9'' 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.
S524 AB 7m2 7m4 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
★★ STT147 AB 6m8 8m7 42.7'' 74° 2016 Aur 06h34m19.37s +38°04'33.60"
A-CD 6m8 9m8 44.5'' 119° 2016
CD 10m6 11m0 0.5'' 109° 1957
Uwe Pilz
Leipzig (Germany)
105mm (200x) ../projects/double-stars/uwe-pilz/sketches/200123stt147.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) At 22x, the components A, B and CD are immediately conspicuous, where A dominates. They form a beautiful, acute-angled triangle. At 69x, color differences are also visible. A: subtle orange; B: grey-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 8m3 8m5 1.6'' 305° 2017 Gem 06h34m21.57s +14°45'08.30"

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

Robert Zebahl
Leipzig (Germany)
70mm (150x) Unfortunately a nearby lamp bothered me. I could see the double star at least elongated.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very neat near equal white stars, well split
★★ STF928 AB 7m9 8m6 3.4'' 131° 2019 Aur 06h34m41.81s +38°32'24.50"
AC 7m9 12m4 130.9'' 124° 2002
BC 8m6 12m4 127.3'' 124° 2015
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB: At 28x the double star already appeared elongated, at 62x beautifully separated, with component A shining in a warm, decent orange. At 125x A appeared orange, B grey-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!
STF938, 14 Mon 6m5 10m6 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 7m3 8m4 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!
S529 AB 6m9 9m3 53.0'' 131° 2015 Gem 06h37m33.90s +12°10'50.00"
René Merting
Drachhausen (Germany)
18x70 ein weit getrenntes Sternpaar - Komponente B im SO ist kupferbraun, die gut 2 bis 2.5 Größenklassen hellere Komponente A strahlt weiß
STF942 10m1 10m1 3.5'' 246° 2015 Gem 06h37m40.87s +23°38'54.20"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint near equal brightness, well split
A2452 9m3 9m6 0.9'' 89° 2015 Gem 06h38m07.10s +19°52'38.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Fine near equal pair, well split but close
STF922 AB 7m7 10m8 10.5'' 137° 2015 Cam 06h38m18.76s +64°44'06.00"
AC 7m7 11m2 24.4'' 2015
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
STF941 AB 7m2 8m2 2.0'' 83° 2019 Aur 06h38m40.76s +41°34'53.40"
AC 7m2 10m5 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.
STT152, 54 Aur 6m2 7m8 0.8'' 34° 2016 Aur 06h39m33.12s +28°15'47.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STT152.jpg
J353 9m4 10m3 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 8m1 10m5 3.5'' 93° 2003 Cam 06h40m10.00s +67°19'24.50"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-04-16: At 100x and 133x not split.
BRT1208 7m9 10m5 5.1'' 175° 2015 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
STF950, S Mon AB 4m7 7m8 3.0'' 214° 2018 Mon 06h40m58.66s +09°53'44.70"
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.
KU27 10m1 10m4 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 AC 8m0 8m9 36.3'' 158° 2015 Mon 06h42m40.55s +01°42'58.20"
René Merting
Drachhausen (Germany)
18x70 leicht - Komponente C zeigt sich gut getrennt im Südwesten von A und ist mehr als eine Größenklasse schwächer
AG119 8m9 9m1 1.5'' 83° 2015 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 7m3 9m1 4.0'' 129° 2019 Lyn 06h44m51.62s +59°26'57.40"
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy to split with noticeable difference in brightness. Very nice view together with the triple system STF 948 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit 12 Lyn ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 100x and 129x easy to separate, quite uneven. Primary component appeared yellowish, the fainter one rather greyish. Fantastic view together with 12 Lyn (STF 948) in one field of view!
AGC1, 9 CMa, alpha CMa, Sirius AB -1m5 8m4 10.7'' 75° 2016 CMa 06h45m08.92s -16°42'58.00"

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

Uwe Pilz
Leipzig (Germany)
105mm (198x) mit ADV, ohne nicht trennbar. Eindeutig
Mark McCarthy
Fremont (California/USA)
203mm (368x) Small disk formed on diffraction spike at correct separation and PA (Feb. 2016)
Mark McCarthy
Fremont (California/USA)
317mm (443x) A faint yellow-orange disk, to the edge of Sirius A’s diffraction and just below my spider’s diffraction spike. I let Sirius pass beyond the field stop, and for an instant there was Sirius B, clearly separated, before it too passed beyond the field stop.
STF957 AB 7m5 9m4 3.8'' 90° 2019 Gem 06h45m10.02s +30°49'33.50"
AC 7m5 13m8 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.
POU1983 11m3 11m6 2.9'' 315° 2015 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 7m1 10m9 15.1'' 261° 2015 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"
BRT146 11m2 11m8 3.6'' 47° 2015 Gem 06h45m55.18s +24°05'58.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Faint, 1 delta mag, ~1.5" well split
COU472 11m4 11m3 1.9'' 83° 2015 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 5m4 6m0 1.9'' 64° 2019 Lyn 06h46m14.15s +59°26'30.10"
AC 5m4 7m0 8.8'' 310° 2018

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

Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: Components A/B and C well separated, but tight. Significant difference in brightness. The fainter C companion appeared slightly orange, the brighter one white-bluish.
Robert Zebahl
Leipzig (Germany)
55mm (167x) AB: Components A and B separated, whereby the Airy disks slightly overlap. The difference in brightness was well visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf948.jpg
Robert Zebahl
Leipzig (Germany)
63mm (140x) AB: Components A and B split with almost no space in between. The difference in brightness was visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf948.jpg
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: Well split, relatively close together with significant difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Both components A + B clearly split, whereby the diffraction rings where merged together. A very nice view together with component C. I sketched this triplet, which reflects my impression well. Unfortunately, the distance and position angle are not particularly well observed. Also the difference in brightness I didn't noticed during my observation. ../projects/double-stars/robert-zebahl/sketches/2019-01-20_stf948.jpg
Robert Zebahl
Leipzig (Germany)
102mm (129x) At 28x the pair AC is nicely separated without any problems. The close pair AB is already recognizable at 86x as a clear figure '8', at 125x wonderfully separated. The components A & B appear yellowish. Very nice view together with STF 946 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit STF 946 ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) At 49x the pair AC is beautifully separated with a significant difference in brightness. At 100x, the close pair AB is also separated, although still very close together. A slight difference in brightness is noticeable. At 129x, the view is magnificent. The two bright components A & B present themselves yellowish, the fainter component C rather greyish. STF 948 can be well observed in a field of view with the neighbouring double star STF 946. Both show a nice overall scenery.
HO238 8m9 9m1 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 8m9 10m3 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 12m6 12m7 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 11m9 12m6 3.4'' 2015 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 7m2 9m2 0.6'' 161° 2018 Mon 06h47m47.56s +00°20'24.50"

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

Mark McCarthy
Fremont (California/USA)
317mm (277x) Yellow A, widely separated from blue B. 2 magnitude difference. Did not notice 0.8" separation in A
J992 11m5 12m3 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 6m3 6m3 4.5'' 77° 2019 Lyn 06h48m12.29s +55°42'15.10"

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

Robert Zebahl
Leipzig (Germany)
70mm (33x) Clearly split, equally bright, close together. Nice view.
Robert Zebahl
Leipzig (Germany)
102mm (62x) Very nicely split. Both components appear similarly bright and white-yellowish.
STF972 A-BC 8m3 9m3 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 7m4 8m7 5.0'' 161° 2015 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
WFC46 & PAL3 WFC46 AB 11m4 11m7 9.2'' 297° 2015 Gem 06h51m02.45s +19°14'40.00"
PAL3 BC 11m7 13m5 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 12m1 12m9 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 9m5 11m3 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 8m2 9m1 21.2'' 2015 Mon 06h51m46.17s +00°27'35.90"
René Merting
Drachhausen (Germany)
18x70 Komponente B ist nördlich von A knapp getrennt erkennbar - Helligkeitsunterschied vielleicht eine Größenklasse
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein ordentlich getrenntes Sternpaar - Komponente B wirkt halb so hell wie A
STF974, 59 Aur AB 6m1 10m2 22.2'' 224° 2015 Aur 06h53m01.41s +38°52'08.90"
BC 10m2 12m8 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 7m8 8m4 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 4m8 7m8 7.4'' 143° 2018 Gem 06h54m38.63s +13°10'40.10"

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

Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x pretty tight with much fainter component. At 71x clearly separated with clear difference in brightness. Brighter component appeared slightly yellowish, the weaker one slightly bluish.
Robert Zebahl
Leipzig (Germany)
70mm (33x) Easy to separated with noticeable difference in brightness. The fainter component appeared slightly orange, the brighter one rather white.
Uwe Pilz
Leipzig (Germany)
105mm (130x) recht attraktiv
Mark McCarthy
Fremont (California/USA)
203mm (333x) 38 Gem. Light yellow A and blue B, quite wide, very pretty. AC much wider separation much fainter not noticed
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow and orange, 2 delta mag, wide separation
Mark McCarthy
Fremont (California/USA)
371mm (553x) Bright orange and slightly red star, 2-3 delta mag.
H5 65, 17 CMa AB 5m8 8m7 42.9'' 147° 2015 CMa 06h55m02.74s -20°24'17.50"
AC 5m8 9m2 48.5'' 187° 2015
AD 5m8 9m7 128.8'' 187° 2015
BC 8m7 9m2 31.3'' 247° 2015
CD 9m2 9m7 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 9m9 10m3 4.4'' 340° 2017 Gem 06h55m18.52s +12°35'07.00"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal white, pretty wide
STF981 8m7 9m0 0.9'' 119° 2016 Gem 06h55m28.54s +30°09'42.30"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close orange pair, equal magnitude. Clean split, ~1".
HN 123, pi CMa 4m7 9m6 11.6'' 13° 2015 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 9m6 10m1 3.7'' 127° 2015 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"]
STF991 AB 8m0 9m2 3.8'' 165° 2019 Gem 06h57m01.26s +24°57'27.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White and orange, 2 delta mag, ~5", PA to S.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pretty off-yellow A and a little ruddy red B, nice
STT159, 15 Lyn AB 4m5 5m5 0.7'' 236° 2017 Lyn 06h57m16.60s +58°25'23.00"

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

Uwe Pilz
Leipzig (Germany)
105mm (200x) nicht getrennt im April 2020 ../projects/double-stars/uwe-pilz/sketches/200409_15Lyn.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) relativ einfach ../projects/double-stars/frederik-wanink/sketches/15Lyn.jpg
A2459 AB 9m8 9m8 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 7m2 7m4 124.1'' 53° 2015 Gem 06h58m06.59s +14°13'43.40"
AC 7m2 8m4 81.2'' 112° 2015
Robert Zebahl
Leipzig (Germany)
70mm (22x) All 3 components form a striking triangle and are slightly different in color. A (western component): white-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 8m1 9m7 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
CPO7, eps CMa 1m5 7m5 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
STF1000 AB-C 8m1 9m0 22.1'' 67° 2016 Gem 06h59m21.15s +25°14'00.20"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein bequem getrenntes Pärchen - Komponente AB kühlweiß - Komponente C im Osten ist eine dreiviertel Größenklasse schwächer und grauweiß
STF994 AB 7m9 8m1 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.
STF1007 AB 7m4 11m4 14.6'' 300° 2015 Gem 07h00m37.12s +12°43'24.20"
AC 7m4 10m0 21.9'' 244° 2015
AD 7m4 7m7 67.7'' 28° 2016
Robert Zebahl
Leipzig (Germany)
70mm (22x) AD: Wide separation, small difference in brightness. Slight difference in color, but difficult to describe. Component A at least seemed rather white. South of STF1007 there is also the double star HJ3288 and the star HD52976, which appears in a bright orange. Together in one field of view a beautiful sight. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
★★ BU100 7m3 11m1 3.2'' 261° 1978 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 7m2 8m2 0.2'' 99° 1997 Mon 07h01m09.85s +11°46'28.70"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Not perfectly round AB, a faint bluish haze in the diffraction to the south. Marginal.
STF1010 AC 7m7 8m8 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 7m2 7m8 0.8'' 311° 2018 Mon 07h01m49.89s -10°52'56.30"

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

Uwe Pilz
Leipzig (Germany)
105mm (247x) schwach gekerbt ../projects/double-stars/uwe-pilz/sketches/bu573.jpg
HJ3288 7m3 8m7 38.5'' 247° 2015 Gem 07h02m18.43s +12°34'54.20"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Easy to separate with moderate angular distance and a significant difference in brightness. Slight difference in color: white-yellowish, slightly orange. Nice view together with the double star STF1007 and HD52976, which appears in a bright orange. Sketched together with STF1007. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
A2462 AB 9m2 9m0 0.2'' 259° 2018 Gem 07h02m37.42s +15°58'26.50"

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

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Short period list. Notched, noticeable magnitude difference, B star pointed in direction of apex of right triangle it forms with two other eighth magnitude stars. Light orange stars
HO342 8m0 8m7 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".
Mark McCarthy
Fremont (California/USA)
371mm (553x) Split when seeing stills. orange A and yellowing B, 1.5-2”
A1575 8m6 9m3 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 7m8 9m4 9.1'' 66° 2019 Lyn 07h03m05.51s +54°10'26.60"
AC 7m8 9m3 9.9'' 58° 2019
BC 9m4 9m3 1.6'' 2019
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-23: At 28x the pair A-BC is easy to separate. At 160x, the very close pair BC shows split. The component A appears slightly orange.
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/200409stf1001.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2020-03-23: At 22x, the wide pair A-BC already appears separated, but still very tight. At 69x, A appears in a decent orange. The pair BC shows elongated and rather greenish-bluish. At 100x BC is already visible as figure '8' and almost separated, at 129x clearly separated. Components B and C are still very close together and equally bright. The color impression remains. An interesting and rewarding triple system! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1001.jpg
STF1009 AB 6m9 7m0 4.4'' 148° 2019 Lyn 07h05m39.83s +52°45'31.30"
Robert Zebahl
Leipzig (Germany)
70mm (33x) Very nice view. Equally bright components, tight.
★★ STF1014 9m9 9m9 2.0'' 221° 2017 Gem 07h05m44.95s +26°08'25.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint near equal brightness pair, ~3", PS to the SW.
ENG28 AB 7m9 7m7 171.9'' 99° 2015 Gem 07h08m00.24s +15°31'42.90"
Mark McCarthy
Fremont (California/USA)
80mm (13x) Pretty, wide equal finder split, white, nice field.
STT165, 45 Gem AB 5m4 10m9 16.0'' 2015 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]
STTA83 & HO519 HO519 AB 7m2 13m0 32.5'' 73° 2015 Gem 07h09m35.47s +25°43'44.70"
STTA83 AC 7m2 7m8 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.
HJ3934 A-BC 6m9 8m5 13.6'' 238° 2017 CMa 07h11m20.93s -21°48'11.80"
Uwe Pilz
Leipzig (Germany)
105mm (180x) schwach
HDS999 6m4 9m1 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 7m8 8m9 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!
STF1037 AB 7m2 7m3 0.8'' 304° 2018 Gem 07h12m49.08s +27°13'30.20"

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

Uwe Pilz
Leipzig (Germany)
105mm (260x) eingekerbt ../projects/double-stars/uwe-pilz/sketches/stf1037.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) leichter, gleich hell ../projects/double-stars/frederik-wanink/sketches/STF1037.jpg
J59 10m2 10m4 1.5'' 205° 2015 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 7m4 10m9 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 9m1 10m1 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 7m8 8m4 1.5'' 278° 2017 Lyn 07h14m48.05s +52°32'44.10"
AC 7m8 10m2 79.6'' 273° 2015
Robert Zebahl
Leipzig (Germany)
102mm (160x) The pair AB appears clearly separated, but still pretty tight with a well visible difference in brightness. The faint C component is wide apart at a similar position angle. ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1033.jpg
BRT1227 9m9 11m7 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 8m0 8m9 3.9'' 299° 2017 Mon 07h15m34.34s -01°51'36.80"
Mark McCarthy
Fremont (California/USA)
317mm (170x) Wide reddish pair.
★★ HJ3945, 145 CMa, Winter Albireo AB 5m0 5m8 26.8'' 50° 2015 CMa 07h16m36.84s -23°18'56.10"
René Merting
Drachhausen (Germany)
8x30 Winter-Albireo - ein eng stehendes Pärchen, ganz knapp getrennt - Komponente A im SW knallig orange, bei B ist schwer eine Farbnuance erkennbar, eher weißlich und deutlich schwächer als A
René Merting
Drachhausen (Germany)
10x50 ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
René Merting
Drachhausen (Germany)
18x70 ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x leuchtet Komponente A goldgelb, B im NO wirkt weiß ohne den erwarteten Farbstich, auch nicht bei 107x und auch nicht, wenn ich die Sterne leicht unscharf stelle - trotzdem sehenswert - auch bei 20x zeigen sich beide Sterne ordentlich voneinander getrennt, A strahlt jetzt noch tiefgelber, fast orange
Uwe Pilz
Leipzig (Germany)
105mm (37x) sofort auffallend, blau-orange ../projects/double-stars/uwe-pilz/sketches/hj3945.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.
STT170 AB 7m4 7m7 0.6'' 288° 2018 CMi 07h17m38.51s +09°17'31.50"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) Notched, near equal at 333x. At 667x, hairline split very easy to see, near equal white stars
HEI725 10m5 10m7 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 9m9 11m1 4.5'' 353° 2015 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 10m0 10m4 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 9m3 9m8 4.1'' 350° 2019 Gem 07h19m49.31s +13°22'22.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pumpkin orange pair, near equal magnitude, PA to north. Well separated ~4". Nice.
STF1050 AB 8m1 8m8 19.3'' 21° 2017 Lyn 07h19m51.29s +54°55'18.40"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Rather faint, obviously split with visible difference in brightness. View similar to STF 1062.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
A2862 8m4 9m6 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 3m5 8m2 5.4'' 234° 2017 Gem 07h20m07.39s +21°58'56.40"

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

Robert Zebahl
Leipzig (Germany)
55mm (71x) Large difference in brightness. The fainter component was well separated, but just a very tiny star.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Easy to separate with relatively large distance. The companion appeared as a tiny, faint star.
Uwe Pilz
Leipzig (Germany)
105mm (288x) erster Ring in SSW heller, zweiter nur an dieser Stelle sichtbar
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wasat = Delta Geminorum: Pretty white-yellow and red-orange pair, PA to west, ~4".
A2863 9m3 9m5 1.2'' 288° 2015 CMi 07h20m09.95s -00°01'11.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) White near equal, very fine pair in dense field
STF1038 8m2 10m3 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 7m4 7m8 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 7m9 10m2 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 9m5 9m6 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 8m7 9m3 1.7'' 324° 2019 Gem 07h21m21.87s +34°01'36.20"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty close, 1.5", white, 1 delta mag, PA to NW.
STF1065, 20 Lyn 7m5 7m7 14.9'' 256° 2017 Lyn 07h22m15.11s +50°08'55.70"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Nicely split, moderate distance, similarly bright.
STF1062, 19 Lyn AB 5m8 6m7 14.8'' 316° 2018 Lyn 07h22m52.06s +55°16'53.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Clearly separated, moderate distance, noticeable difference in brightness. The colors seemed different, but not exactly definable.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
Uwe Pilz
Leipzig (Germany)
105mm (21x) ../projects/double-stars/uwe-pilz/sketches/200409_19Lyn.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Easy to separate, but still quite close together with visible difference in brightness. Color wise unremarkable.
J366 8m9 10m4 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 7m7 8m5 1.9'' 234° 2019 Gem 07h24m08.94s +21°27'28.00"
AC 7m7 9m9 107.0'' 63° 2015
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.
A2865 10m3 10m6 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 10m6 10m9 2.6'' 56° 2015 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 7m3 8m1 6.8'' 45° 2015 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.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Equal wide, white.
Mark McCarthy
Fremont (California/USA)
317mm (553x) White, equal brightness, PA to NE.
HO346 AB 7m0 11m7 13.2'' 59° 2015 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!
STF1090 AB 7m3 8m2 60.8'' 98° 2017 Gem 07h26m27.33s +18°31'00.80"
AC 7m3 9m5 49.9'' 79° 2015
BC 8m2 9m5 20.9'' 328° 2015
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 9m3 10m0 0.6'' 138° 1991 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
STF1095 8m6 9m3 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 7m6 8m5 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.
S548 AC 7m0 8m9 35.1'' 277° 2015 Gem 07h27m40.54s +22°08'29.30"
René Merting
Drachhausen (Germany)
100mm (20x) 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
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange with a 2x fainter white star, PA slightly SW. AB is 12th mag and not seen
BU21, eta CMi 5m2 11m1 4.3'' 28° 2015 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 9m3 10m8 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
STF1103 7m1 8m6 4.2'' 244° 2019 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.
STF1108 6m6 8m2 11.7'' 179° 2017 Gem 07h32m50.63s +22°53'15.40"
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)
317mm (553x) Orange stars, 2 delta mag, PA to south, ~8"
STF1116 7m8 8m5 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 1m9 3m0 5.4'' 53° 2019 Gem 07h34m35.86s +31°53'17.80"
AC 1m9 9m8 69.8'' 163° 2017
AD 1m9 10m1 179.8'' 221° 2017

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

Robert Zebahl
Leipzig (Germany)
55mm (27x) AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 32x wirkt der Stern leicht länglich - bei 107x stehen die beiden Sterne schön eng mit überlagernden Beugungsscheibchen, die Komponenten sind dennoch getrennt erkennbar - Komponente B im Osten ist eine halbe Magnitude schwächer - ganz schwacher Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: blauweiß-weiß ../projects/double-stars/uwe-pilz/sketches/Castor.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) AB: 13.03.2017: Beide Komponenten gelblich mit geringem Helligkeitsunterschied, bereits bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_02_alpha%20Gem_Castor.jpg
STT174 6m6 8m3 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.
KU30 9m3 10m3 3.2'' 110° 2001 Gem 07h35m59.79s +34°19'41.10"
Mark McCarthy
Fremont (California/USA)
203mm (205x) About one delta mag, well split, slightly orange stars
STF1119 8m1 9m3 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 9m2 9m5 0.9'' 188° 2015 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 7m3 9m0 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 6m5 7m0 0.9'' 176° 2017 CMi 07h40m06.99s +05°13'51.90"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) A bit more delta mag than listed, split, white, rather bright pair
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow, very close <1" hair-split, near equal brightness
AG143 9m1 10m1 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
STF1123 9m2 9m8 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 8m1 8m5 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 3m7 10m0 7.2'' 241° 2014 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 8m2 9m8 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 8m7 10m1 1.2'' 213° 1991 Cam 07h45m14.87s +75°47'51.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide separation, 1 delta mag, PA to NW.
HO246 7m6 11m6 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 7m8 7m8 14.4'' 185° 2017 Cam 07h45m52.47s +65°09'28.10"
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 7m7 9m2 0.4'' 259° 2010 Gem 07h46m07.95s +21°07'19.20"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) Clean split with seeing, 1 delta mag, fairly bright pair. I found the apodizing mask worked better than the 8-inch mask, gave more resolving power. The 8-inch was only snowman
STF1137 8m0 9m1 2.9'' 133° 2010 CMi 07h46m35.35s +04°07'50.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light orange and blue, pretty wide, 1.5 delta mag
★★ STF1127 AB 7m0 8m4 5.6'' 340° 2019 Cam 07h47m00.43s +64°03'07.30"
AC 7m0 9m7 11.7'' 179° 2017
BC 8m4 9m7 17.0'' 173° 2017
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
STF1141 AB 8m4 9m4 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
HO36 9m8 9m9 0.6'' 306° 2008 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
STF1140 7m0 8m7 6.4'' 273° 2015 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"
STTA88 AB 7m5 8m9 57.1'' 2015 CMi 07h48m58.22s +00°39'42.90"
René Merting
Drachhausen (Germany)
18x70 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) 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 7m9 10m3 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 7m8 9m2 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 9m7 9m7 2.2'' 175° 2019 Gem 07h50m19.69s +24°31'55.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine 2", equal magnitude blue-white pair, PA to south, ~2".
Mark McCarthy
Fremont (California/USA)
508mm (533x) Nice near equal blue-white stars, wide ~2.5" [not physical, surprisingly]
COU926 9m5 9m7 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 6m8 7m7 76.8'' 84° 2015 Gem 07h51m00.20s +31°36'48.70"
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 5m6 6m5 0.4'' 304° 2018 Pup 07h51m46.31s -13°53'52.80"

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

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 9 Pup. Elongated to notched, orientation correct, light orange. Very tough. [B is coming off it's furthest orbit and will be exceptionally difficult in 10 years, but easier in 15 years]
COU928 9m2 9m7 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 7m8 7m9 0.9'' 2017 CMi 07h52m42.12s +03°23'02.20"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) Compact white pair, more near equal than Sky Tools says, white, easy split
Mark McCarthy
Fremont (California/USA)
317mm (553x) Moderately bright A with 4 much fainter wide and close stars, forms a right triangle.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very close, ~1", near equal brightness white.
WEI17 9m0 9m3 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 9m9 10m7 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
ES422 8m4 10m8 14.9'' 182° 2015 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
STT185 7m1 7m3 0.4'' 22° 2018 CMi 07h57m16.39s +01°07'37.30"

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

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Without the apodizing mask I get a clean split with seeing but constant split with the mask. Light orange stars, noticeable mag difference
STF1162 8m0 10m2 9.0'' 327° 2015 Cnc 07h57m22.66s +13°12'24.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange and blue, pretty wide.
STF1167 9m8 11m8 12.2'' 229° 2015 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.
STF1170 8m7 9m1 2.4'' 108° 2019 Cnc 07h59m45.52s +13°41'19.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Close near equal pair, 2".
STF1171 6m5 9m9 2.0'' 326° 2015 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)
317mm (553x) Yellow and orange, 4 delta mag! very faint and close B
STF1173 AB 8m5 9m9 10.4'' 51° 2015 Cnc 08h01m23.12s +16°56'58.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide, pretty faint
SHJ86 AB 6m2 7m5 51.6'' 81° 2018 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 7m7 12m0 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
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide separation, 3 delta mag, faint B.
ES291 8m6 11m8 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 7m7 7m9 1.1'' 75° 2019 Cnc 08h03m18.52s +26°16'03.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Close, 1" but easy split, near equal dull white color.
BU581 AB 8m5 8m8 0.4'' 226° 2018 Cnc 08h04m23.10s +12°17'23.80"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange near equal, very small, elongated to notched.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange A is not quite round. Marginal
Mark McCarthy
Fremont (California/USA)
508mm (1067x) With apodizing mask. Beautiful clean split, almost wide, light orange stars, slight mag difference. There is a third 2x fainter star further out, might be plus one. Wow. [3rd is AB-C, 8.46/11.78 5.5"]
AG337 9m9 10m2 2.7'' 104° 2015 Gem 08h05m05.60s +28°27'22.50"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Split, very close near equal orange-yellow stars
STF1182 7m5 8m8 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 8m3 9m3 5.1'' 141° 2019 Cnc 08h05m24.56s +08°11'58.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange and blue, 3 delta mag, wide separation.
STF1177, 17 Cnc 6m7 7m4 3.6'' 350° 2019 Cnc 08h05m37.06s +27°31'46.90"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Easy to separate, but still relatively close together. Well visible difference in brightness. Color of the components was not clearly visible. Nice view overall.
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
Christopher Hay
Seeheim (Germany)
125mm (160x) Well split despite substantial turbulence in the atmosphere. Main component creamy yellow-white, companion pale blue. A very attractive colour contrast warranting a one-star rating.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF1177.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellowish, 1 delta mag, ~4"
STF1186 7m1 10m1 3.3'' 212° 2018 Cnc 08h08m49.61s +27°28'49.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 11 Cnc: Orange with very faint B, ~3"
STF1188 8m7 9m3 16.5'' 201° 2017 Cnc 08h09m23.95s +30°20'49.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide separation, near equal white.
STF1187 AB 7m2 8m0 3.1'' 20° 2019 Cnc 08h09m30.45s +32°13'18.80"

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

Robert Zebahl
Leipzig (Germany)
70mm (57x) Split. Components very tight with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange, 1 delta mag, 5"
BUP111 AB 6m6 9m3 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 10m3 10m8 3.6'' 77° 2015 Cnc 08h10m47.59s +19°01'51.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint but well split, ~3", near equal pair
HJ777 AB 9m6 11m7 10.6'' 349° 2016 Cnc 08h11m29.33s +10°41'05.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very wide, faint
★★★ STF1196 & HUT1, zeta Cnc, 16 Cnc STF1196 AC 5m3 5m8 6.3'' 51° 2019 Cnc 08h12m12.79s +17°38'51.20"
STF1196 AB-C 4m9 5m8 6.0'' 64° 2018
STF1196 AB 5m3 6m2 1.1'' 2018
HUT1 Ca-Cb 6m2 7m1 0.3'' 233° 2018

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1196.jpg
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB-C: Easy to separate. A: light grey, B: pale orange.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C clearly split, AB obviously elongated but not split
Uwe Pilz
Leipzig (Germany)
105mm (288x) weißblau-gelb-gelb ../projects/double-stars/uwe-pilz/sketches/zetaCnc.jpg
Robert Zebahl
Leipzig (Germany)
120mm (67x) AB-C: Evident difference in brightness, easy to split. Both components of similar color.
Robert Zebahl
Leipzig (Germany)
120mm (200x) AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star! ../projects/double-stars/robert-zebahl/sketches/2019-02-24_stf1196.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: Sehr schön, 3-fach Stern, A = weißgelb, B = weißgelb, C = weißgelb ../projects/double-stars/winfried-kraeling/sketches/180408_02_Zeta%20Cnc.jpg
Sarah Gebauer
Germany
150mm (83x) AB-C: bei 83x sind AB-C sauber getrennt, laut Atlas 2020 6,1'' Abstand, die Komponenten A und B mit 1,1'' lassen sich nicht trennen, viele schöne Feldsterne dabei ../projects/double-stars/sarah-gebauer/sketches/20200411%20Zeta%20Cnc%20DSk.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (200x) AB-C: AB (1,1") nicht bemerkt ../projects/double-stars/frederik-wanink/sketches/STF1196.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 2+1 system, the +1 star is HUT 1. STF 1196AB make a nice tight pair. They are all nearly the same magnitude, white & brilliant
Mark McCarthy
Fremont (California/USA)
317mm (553x) Ca-Cb: not quite round, oval/olive shaped. It is the AB-C of STF 1196.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Triple, all near equal magnitude, yellow-white. AB ~0.8", hair split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Triple, all near equal magnitude, yellow-white. AC ~6", wide split.
STF1197 9m0 9m7 1.8'' 101° 2019 Cnc 08h12m44.45s +29°32'30.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint pair, 1 delta mag, ~2".
STF1201 8m1 9m5 6.7'' 185° 2015 Cnc 08h12m52.51s +09°34'40.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty wide, 5", 1 delta mag.
STF1202 7m4 9m6 2.7'' 305° 2015 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"
H6 78 AC 6m4 10m9 63.3'' 300° 2015 Cnc 08h14m11.14s +17°40'33.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) very wide, bright white, 3 delta mag.
STT189 6m9 10m7 4.4'' 293° 2017 Lyn 08h14m49.01s +43°02'05.90"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-04-14: Not even partially separated.
LEP30 7m7 9m8 31.8'' 238° 2015 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
STF1210 AB 7m2 9m4 15.5'' 113° 2015 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 9m3 10m9 20.8'' 345° 2017 Lyn 08h16m42.64s +40°53'13.90"
AC 9m3 11m3 17.8'' 334° 2017
BC 9m9 10m1 4.8'' 211° 2017
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.
★★ STF1193 AB 6m2 9m7 42.4'' 90° 2015 UMa 08h20m40.32s +72°24'26.00"
BC 9m8 12m7 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
STF1223, phi 2 Cnc 6m2 6m2 5.4'' 218° 2019 Cnc 08h26m47.08s +26°56'07.80"
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schön, blauweiß-gelbweiß ../projects/double-stars/uwe-pilz/sketches/stf1223.jpg
STF1230 9m3 10m6 34.2'' 186° 2015 Cnc 08h28m25.95s +16°51'09.10"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Komponente B nur indirekt. bei 88x erahnbar. ../projects/double-stars/uwe-pilz/sketches/200323STF1230.jpg
A551, LO Hya AB 7m0 7m1 0.4'' 63° 2018 Hya 08h28m29.16s -02°31'01.60"

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

Mark McCarthy
Fremont (California/USA)
508mm (1067x) LO Hya. With apodizing mask. Easy split, noticeable half delta mag. Another fainter star further out likely +1 [The +1 is STF 1233 AB-C, 6.42/10.49 18.3". AB at furthest extent of orbit, will tighten considerably the next 20 years]
A2893 9m8 9m4 0.7'' 351° 2015 Hya 08h30m05.67s +05°13'03.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Closely split, noticeable ~1 delta mag, good pair
STF1243 7m8 9m4 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 6m0 7m2 10.1'' 25° 2018 Cnc 08h35m51.05s +06°37'13.90"
AC 6m0 10m7 100.4'' 109° 2017
AD 6m0 11m9 110.3'' 292° 2017
AE 6m0 9m6 114.8'' 207° 2017
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB at 22x separated, but very close, uneven pair. A appeared white-yellowish, B orange, partly reddish. Opposite in a wide separation the fainter component E was visible. At 57x, A appeared white-yellowish, B orange. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1245.jpg
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
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
AG154 9m6 9m8 2.7'' 2019 Cnc 08h36m55.78s +23°14'49.10"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) HO Cnc. Near equal well separated, light orange stars
J1008 10m9 11m1 3.1'' 20° 2002 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]
STF1255 AB 7m3 8m6 26.0'' 30° 2015 Hya 08h39m43.80s +05°45'51.40"
René Merting
Drachhausen (Germany)
100mm (20x) 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!)
STN61 8m4 9m4 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 6m4 10m4 20.8'' 55° 2017 Cnc 08h40m22.11s +19°40'11.90"
AC 6m5 7m6 62.5'' 343° 2018
AD 6m5 9m2 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)
BAL1852 11m0 11m0 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 7m7 7m9 10.0'' 330° 2017 UMa 08h43m25.41s +48°51'41.90"
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.
BAL2821 12m6 13m1 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 6m9 7m5 4.7'' 265° 2017 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
Mark McCarthy
Fremont (California/USA)
508mm (533x) MX Hya. Wide, yellow-white, half delta mag. Nice
CBL32 7m4 10m7 41.0'' 174° 2015 Cnc 08h46m14.32s +27°35'41.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Dull orange with fairly faint 10.5 mag B, wide separation
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 4m1 6m0 30.7'' 308° 2018 Cnc 08h46m41.82s +28°45'35.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-bluish.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Grand sight! Pretty wide apart and unequal. A: decent orange, B: very nice light blue.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) wide pair with nice colour contrast yellow/blue
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb-blaugrau ../projects/double-stars/uwe-pilz/sketches/iotaCnc.jpg
Sarah Gebauer
Germany
150mm (125x) bei 83x schon deutlich getrennt, der Farbkontrast ist gut zu sehen, er wird bei 125x noch stärker, ein zartes Blau und Gelb sind zu sehen ../projects/double-stars/sarah-gebauer/sketches/20200411%20i%20Cnc%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 80mm finder split, beautiful yellow and blue. Scope view real nice. Very good diffraction and airy disks.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Iot Cnc: Pretty orange and pale blue, showpiece object.
★★★ 11 Hya, epsilon Hya SP1 AB 3m5 5m0 0.2'' 241° 2018 Hya 08h46m46.51s +06°25'07.70"
STF1273 AB-C 3m5 6m7 2.9'' 309° 2017
STF1273 AB-D 3m5 12m5 18.1'' 201° 2017
STF1273 AB-E 3m5 10m8 340.5'' 2015
STF1273 AB-F 3m5 10m4 406.5'' 265° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB-C: bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB-C: Epsilon Hya A is bright orange-yellow, B is much fainter and a little blue, ~3". [SP 1 AB is 3.49/5.00 0.2" not seen]
STF1281 AB 7m8 9m0 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
BAL2347 AB 9m3 10m8 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 7m5 9m4 2.6'' 265° 2017 Hya 08h48m12.24s +02°34'48.40"
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig ../projects/double-stars/uwe-pilz/sketches/200323BU335.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Close, ~3", 2 delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (533x) 3 delta mag, well split ~3", very pleasing pair, white A and slightly red B
STT194 7m4 10m5 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 4m4 11m9 12.1'' 146° 2015 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 9m5 9m8 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 9m1 8m5 0.3'' 208° 2018 Hya 08h48m40.30s +00°56'31.00"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow fine split. Pale yellow A and blue B, about one delta mag. Nice split, amazing [82.4 year period]
J74 11m2 11m3 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 9m3 10m6 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]
STF1282 AB 7m6 7m8 3.5'' 279° 2019 Lyn 08h50m44.28s +35°04'15.40"
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.
STF1275 AB 8m7 8m9 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.
BAL2354 9m9 11m7 8.5'' 40° 2015 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]
STF1290 7m4 9m2 2.8'' 325° 2017 Hya 08h52m03.40s +04°27'58.00"
Mark McCarthy
Fremont (California/USA)
508mm (533x) White stars, wide, 2 delta mag
A2900 6m4 9m5 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 6m5 11m7 43.7'' 335° 2003 Cnc 08h52m28.60s +28°15'33.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 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).
A2752 9m0 11m0 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 9m3 9m5 6.1'' 189° 2017 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 7m7 8m3 9.8'' 139° 2017 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.
STF1291, 57 Cnc AB 6m1 6m4 1.6'' 309° 2019 Cnc 08h54m14.65s +30°34'45.80"
AB-C 5m5 9m2 54.6'' 204° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Immediately apparent as a double star. Diffraction disks overlapping slightly ('8'). Difference in brightness visible.
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb ../projects/double-stars/uwe-pilz/sketches/57Cnc.jpg
Sarah Gebauer
Germany
150mm (125x) AB: sowohl bei 83x als auch bei 125x knapp vorm Trennen
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 57 Cnc. Very nice pair, strong orange yellow colors, ~1 delta mag, bright, nice close split
BAL1430 10m1 11m0 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]
STF1289 8m2 8m9 3.7'' 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.
STF1280 AB 8m8 9m1 3.4'' 358° 2018 UMa 08h55m24.82s +70°47'39.20"

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

René Merting
Drachhausen (Germany)
100mm (72x) ein knapp getrenntes Sternpaar - beide Sterne sind annähernd gleich hell und strahlen rein weiß - bei 144x eine ordentlichere Trennung, Komponente A im Süden strahlt in einem wärmeren Weiß
ARG21, AC UMa 10m0 10m4 21.4'' 106° 2015 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.
STF1294 & SIN41 STF1294 AB 9m0 10m8 15.6'' 340° 2015 Cnc 08h57m17.08s +32°53'57.90"
SIN41 AC 9m0 12m6 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 7m3 9m6 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)
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.
HJ2477 & HU628, iota UMa, 9 UMa, Talitha HJ2477 A-BC 3m1 9m2 2.4'' 90° 2017 UMa 08h59m12.45s +48°02'30.60"
HU628 BC 9m9 10m1 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: 2020-04-23: The seeing (2-3/5) was too bad 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 9m1 9m9 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.
STF1302 AB 9m3 9m5 2.7'' 233° 2017 Hya 09h01m12.87s +02°44'44.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Near equal easy pair, ~2.5"
STF1298, 66 Cnc AB 6m0 8m6 4.4'' 137° 2017 Cnc 09h01m24.13s +32°15'08.30"
AC 6m0 12m0 187.6'' 318° 2015
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 6m1 9m2 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.
A1585, kap UMa 4m2 4m5 0.3'' 285° 2017 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 8m1 9m2 10.5'' 85° 2016 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 10m1 10m6 4.3'' 225° 2018 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 8m5 8m4 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
AG162 9m8 10m1 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 6m9 7m1 7.8'' 199° 2019 Cnc 09h07m27.01s +22°58'51.10"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Milk white A and off-white, yellowish B, ~1 delta mag, well separated
POU3029 10m1 10m4 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 8m3 8m3 51.5'' 274° 2018 Cnc 09h08m27.16s +27°32'35.30"
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.
WRH16, xi Cnc 5m7 6m2 0.2'' 108° 1944 Cnc 09h09m21.53s +22°02'43.60"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
STF1312 8m3 8m8 4.8'' 148° 2017 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.
★★ STF1306, sigma 2 UMa, 13 UMa AB 4m9 8m8 4.3'' 348° 2016 UMa 09h10m23.53s +67°08'03.30"
AC 4m9 10m3 197.8'' 148° 2003

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) AB: Companion almost permanently visible as elongated, non-condensed brightening of the first diffraction ring of the primary component at the correct position angle.
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: sehr schwierig bei 88x ../projects/double-stars/uwe-pilz/sketches/200316stf1306.jpg
STF1322 8m3 8m7 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 7m3 7m7 24.9'' 27° 2017 UMa 09h12m45.94s +61°40'32.70"
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.
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 9m8 10m6 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 9m5 10m5 12.0'' 216° 2015 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 10m2 10m7 5.1'' 320° 2015 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 7m8 9m5 2.4'' 228° 2018 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.
STF1321 AB 7m8 7m9 17.0'' 98° 2018 UMa 09h14m22.79s +52°41'11.80"
AC 7m8 14m5 145.7'' 64° 2010
AD 7m8 11m9 136.4'' 129° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-11: At 22x pretty wide pair with equally bright components. Striking colors: slightly orange & white-bluish, but it was a bit difficult to assign the colors to the components. At 44x slightly better color perception.
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.
TDS6428 10m4 10m5 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 7m9 8m1 5.9'' 29° 2015 Cnc 09h17m19.21s +23°39'09.80"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal wide pair, ~5", maybe half delta mag
STF1336 7m0 11m1 40.1'' 180° 2015 Hya 09h17m32.92s +00°33'17.80"
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr weit, kein Doppelstern-Eindruck ../projects/double-stars/uwe-pilz/sketches/200323STF1336.jpg
STF3121 AB 7m9 8m0 0.5'' 205° 2017 Cnc 09h17m53.45s +28°33'37.70"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) IP Cnc Split at 533x, used 1067x to recheck orientation. With apodizing mask. Light yellow-orange stars, nice and clean split, very slight mag difference. Real nice
STF1333 6m6 6m7 1.9'' 50° 2017 Lyn 09h18m25.97s +35°21'51.30"
Robert Zebahl
Leipzig (Germany)
63mm (120x) At 93x seen as '8', at 120x split, but pretty tight with no visible difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (200x) fast gleich hell, beide gelblich, bei 66x schwierig ../projects/double-stars/uwe-pilz/sketches/stf1333.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Brilliant white pair, near equal, ~2" separation
STF1334, 38 Lyn AB 3m9 6m1 2.5'' 229° 2017 Lyn 09h18m50.64s +36°48'09.30"

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

Uwe Pilz
Leipzig (Germany)
60mm (198x) Aufhellung im ersten Ring
Robert Zebahl
Leipzig (Germany)
63mm (140x) Fainter companion only seen as permanent brightening on the first diffraction ring. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf1334.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb, trennbar bei 66x ../projects/double-stars/uwe-pilz/sketches/38Lyn.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 38 Lyn: Very bright A with 3x fainter dull white B, 3-4"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 38 Lyn. A is a bright light yellow and B is a ~2 delta mag orange-yellow, well split and bright
STF1331 AB 8m5 8m7 0.9'' 153° 2017 UMa 09h20m46.02s +61°20'58.40"
AC 8m5 11m6 13.5'' 186° 2015
AD 8m5 14m5 19.4'' 117° 2015
AE 8m5 9m8 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
STF1339 9m2 9m9 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 6m7 7m1 1.1'' 314° 2017 Lyn 09h20m59.40s +38°11'17.90"

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

Mark McCarthy
Fremont (California/USA)
508mm (333x) Wonderful light yellow stars, near equal, ~1" separation
ES1541 10m4 11m2 8.2'' 23° 2015 Lyn 09h22m05.95s +39°58'00.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) White and dull white pair, ~1 delta mag, wide ~8"
★★ STF1347 7m3 8m3 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 9m9 10m1 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 9m0 9m5 3.8'' 104° 2018 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.
STT201 AB 8m5 9m5 1.4'' 206° 2017 Leo 09h23m54.50s +27°54'00.00"

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

Mark McCarthy
Fremont (California/USA)
203mm (205x) Extremely fine split, with seeing only, finest of the night, significant mag difference, just above 1" separation
★★ STF1348 AB 7m5 7m6 2.0'' 314° 2018 Hya 09h24m28.48s +06°21'01.80"
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
BU105, kappa Leo, 1 Leo AB 4m6 9m7 2.0'' 209° 2015 Leo 09h24m39.28s +26°10'56.80"
AC 4m6 11m1 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.
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 6m5 8m6 1.3'' 334° 2016 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 7m7 8m6 5.8'' 314° 2017 UMa 09h25m37.88s +54°00'57.50"
BC 8m6 11m8 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.
AG166 9m1 11m1 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 9m6 10m0 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 7m7 7m8 1.8'' 357° 2018 Hya 09h27m16.69s +06°13'59.00"

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, equally bright. At 80x detectable notch. At 100x and 133x clearly visible as figure '8'. Near the double star STF 1348.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1348, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow pair, near equal, very nice, ~2"
STF1353 9m9 10m0 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 10m8 10m9 0.5'' 71° 1991 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 5m7 7m3 0.9'' 114° 2018 Leo 09h28m27.41s +09°03'24.40"
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.
H4 47, 3 Leo 5m8 11m1 25.2'' 80° 2015 Leo 09h28m29.19s +08°11'18.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange star with well separated white B, 2 delta mag.
41 Lyn, S598 AB 5m5 7m8 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.
BAL2364 10m0 10m5 8.7'' 140° 2015 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 7m8 8m9 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 8m9 8m9 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 7m5 9m0 19.2'' 166° 2015 UMa 09h31m09.89s +67°32'28.40"
Christopher Hay
Seeheim (Germany)
60mm (25x) At 25x a wide split, substantial difference in brightness, B a fine pinprick of light. B appears light blue at first, but colour impression disappears quickly - an interesting visual effect repeated several times. According to Stelledoppie a true physical pair. Nice together with Struve 1350 in same FOV. A very fine double-double for very small apertures.
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 7m4 8m0 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 3m6 9m2 22.7'' 267° 2015 UMa 09h31m31.57s +63°03'42.50"
AC 3m7 11m8 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.
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 5m2 9m3 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 8m6 9m7 16.4'' 155° 2015 Leo 09h32m01.52s +20°02'49.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Unremarkable wide separation faint stars
HN 29 6m5 12m1 27.8'' 263° 2015 Leo 09h33m18.32s +28°22'04.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very wide, very faint B star. Not very exciting.
HJ467 10m0 11m0 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 8m3 8m3 10.2'' 249° 2015 UMa 09h34m19.56s +66°47'42.30"
AC 8m3 9m2 131.0'' 216° 2015
Christopher Hay
Seeheim (Germany)
60mm (25x) AB: Tight but nicely split at 25x. No colour whatsoever seen. A appears brighter than B, whereby the data do not support this – perhaps a product of different (yet not seen) colouration? According to Stelledoppie not a physical pair. Attractive together with Struve 1349 in same field of view.
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
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß
STF1369, DI Lyn AB 7m0 8m0 25.0'' 150° 2018 Lyn 09h35m22.50s +39°57'47.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 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 7m9 10m2 8.2'' 275° 2015 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 4m8 12m5 6.7'' 61° 2012 LMi 09h35m39.50s +35°48'36.40"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) 11 LMi: Very faint A & extremely faint B, wide separation. From the orbital chart this is approaching maximum elongation now (May 2017), by 2143 it will be 1". Only 39 light years away.
H5 58, 7 Leo 6m3 9m4 41.0'' 90° 2014 Leo 09h35m52.88s +14°22'46.50"
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, wide, white, 2 delta mag.
ES428 9m3 11m2 13.2'' 203° 2015 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
STF1362 7m0 7m2 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 6m7 10m7 8.3'' 99° 2015 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 7m3 8m7 2.8'' 311° 2017 LMi 09h41m21.88s +38°57'01.90"

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-01: Separable at 67x, but difficult due to the bright primary component. Clearly separable at 80x and higher magnifications with a significant difference in brightness. The companion stands close to the primary component and appears as a tiny star. Nice view.
Robert Zebahl
Leipzig (Germany)
120mm (168x) At 50x elongated, at 75x seen as '8'. At 168x clearly split with obviously fainter component.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pretty orange-yellow stars, ~2 delta mag, ~3 separation
STT206 8m3 11m4 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 8m0 12m6 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 9m8 11m8 5.0'' 243° 2018 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 9m0 9m2 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
A2560 8m8 9m8 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 8m0 9m8 0.4'' 99° 2011 LMi 09h51m09.34s +36°29'20.80"

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

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

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

Uwe Pilz
Leipzig (Germany)
105mm (260x) länglich, schwierig
A2139 8m0 10m7 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]
AC5, gam Sex AB 5m4 6m4 0.5'' 41° 2016 Sex 09h52m30.47s -08°06'17.70"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) Gamma Sex: I get a split with seeing of nearly equal orange yellow stars, only momentarily
STT209 7m4 10m3 4.9'' 310° 2017 UMa 09h53m17.23s +50°37'16.30"
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 6m9 8m4 53.5'' 287° 2016 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 7m7 8m4 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
TOK668 6m1 7m4 5.3'' 259° 2015 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 8m1 11m4 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 8m5 9m1 1.3'' 257° 2016 UMa 10h02m35.64s +46°21'42.50"
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.
HU631 8m0 9m3 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 11m1 11m4 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 8m4 9m4 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 8m0 8m8 1.1'' 295° 2016 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.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tight but clear split, ~1", 1 delta mag. A slightly green, B a little orange.
STF1405 7m3 11m8 22.0'' 252° 2015 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.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow-white A, fairly faint blue B wide separation.
TDS569 10m9 11m1 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 10m5 10m5 2.5'' 159° 2013 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
alpha Leo, 32 Leo, Regulus STFB6 AB 1m4 8m2 175.5'' 308° 2016 Leo 10h08m22.31s +11°58'01.90"
HDO127 AD 1m4 12m1 195.3'' 274° 2015
HDO127 BC 8m2 13m2 2.1'' 95° 2015
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) AD: Komponente D ist südwestlich von B (STFB6) erkennbar, etwas weiter von A entfernt als B, klein und unscheinbar
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x extrem weit getrennt erkennbar - Komponente A ist weißblau, die wesentlich schwächere Komponente B strahlt weißgrau
STF1407 10m2 10m6 4.9'' 51° 2018 UMa 10h09m01.98s +64°26'40.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal faint 10th-11th mag white stars, 4"
A1988 10m0 9m8 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 9m8 11m6 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
STF1413 9m8 9m8 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 8m6 9m8 1.1'' 121° 2017 Leo 10h13m08.88s +27°25'10.50"

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

Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright yellow A, ~2 magnitudes fainter B, very wide separation.
STF1417 9m2 9m3 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 10m1 10m4 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 7m2 7m5 1.5'' 176° 2019 Leo 10h16m16.05s +17°44'24.60"

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) Appeared partly separated, partly as '8'. Brightness seemed to be equal.
Uwe Pilz
Leipzig (Germany)
105mm (288x) trennbar bei 120x
Mark McCarthy
Fremont (California/USA)
317mm (277x) very close split (1.7" separation) near equal bright white stars
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal light yellow stars, ~1.5"
SHY552 7m4 8m8 107.2'' 2015 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, zet Leo 3m5 6m0 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 5m8 10m0 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 8m9 9m9 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 5m8 11m3 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)
317mm (553x) Unremarkable star with wide, very faint B
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 6m7 7m3 16.6'' 168° 2018 UMa 10h17m50.61s +71°03'38.90"
AC 6m7 10m8 153.3'' 13° 2015
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.
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 8m5 9m7 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 8m2 9m1 4.6'' 330° 2017 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 9m1 10m6 2.2'' 318° 2015 LMi 10h18m33.30s +39°06'37.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint orange and 2 delta mag B ~2".
COU170 11m1 11m8 0.7'' 122° 1985 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 9m4 10m1 0.7'' 308° 2018 Leo 10h19m10.64s +20°33'48.10"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Tough! Elongated to hairline split.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Split with seeing, light orange A and very faint, ~3 delta mag B, very close, within diffraction ring <1"
★★ STF1424, gamma Leo, 41 Leo, Algieba AB 2m4 3m6 4.9'' 126° 2019 Leo 10h19m58.35s +19°50'29.40"

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

Robert Zebahl
Leipzig (Germany)
55mm (38x) At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_gamma_leo.jpg
Robert Zebahl
Leipzig (Germany)
55mm (59x) Very nice unequal double. A appeared yellow-orange, B rather white-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_gamma_leo.jpg
Christopher Hay
Seeheim (Germany)
60mm (58x) At 25x Algieba is already very elongated. At 58x a sliver of dark between the components, with clear brightness difference. At 70x split becomes more stable, but view not so pleasing as at 58x. Both components display vivid orange.
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 67x still a relatively close pair, but well separated with quite a clear difference in brightness. At 100x easy to separate and visible color difference: A yellowish to slightly orange, B white-yellowish.
Robert Zebahl
Leipzig (Germany)
102mm (125x) Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) very bright double star, slight colour contrast
Uwe Pilz
Leipzig (Germany)
105mm (120x) schon bei 37x sehenswert; trennbar bei 55x; orange-blauweiß
Robert Zebahl
Leipzig (Germany)
120mm (66x) At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: merklicher Helligkeitsunterschied, A = gelb-orange, B = gelb-orange ../projects/double-stars/winfried-kraeling/sketches/180408_04_Gamma%20Leo.jpg
Sarah Gebauer
Germany
150mm (83x) bei 83x sauber getrennt, ein leichter Farbunterschied (Weiß und helles Gelb) sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200411%20Gamma%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Algieba: Bright yellow and yellow-orange pair, 1 delta mag, 4-6"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright yellow and yellow-white, 1 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very bright yellow, 1 delta mag wide.
René Merting
Drachhausen (Germany)
320mm (240x) bei 240x sehe ich zwei ordentlich getrennte Sterne (naja, nicht wirklich Sterne, sondern wild zappelnde Glitzerbällchen) - Komponente A strahlt in einem zarten Gelb, B ist weiß - zurück auf 144x sehe ich nur ein Stäbchen mit leichter Einschnürung, so wild tanzen die Sterne
Mark McCarthy
Fremont (California/USA)
508mm (333x) Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire
STF1426 AB-C 7m3 9m4 7.6'' 2018 Leo 10h20m32.32s +06°25'47.60"
AB 8m0 8m3 0.9'' 313° 2018

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

René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 213x in guten Momenten als Stäbchen erkennbar
AB-C: bei 107x ist nördlich vom Hauptstern AB eine gut 2 Größenklassen schwächere Komponente erkennbar - AB ist weiß, C ist grau
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: Quite large angular distance and therefor easy to separate. The C component was pretty faint.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB: At first glance elongated, on closer look visible as '8'.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C easily split, A-B not detectable as double
Uwe Pilz
Leipzig (Germany)
105mm (288x) A-B länglich, C weit
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Split with seeing, white, very close, near equal. Part of plus one, a two delta mag not far away
STF1425 9m9 10m7 4.8'' 358° 2017 UMa 10h21m34.14s +46°09'07.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint pair, ~4-5" orange and blue, 0.5 delta mag.
STF1427 8m2 8m5 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)
317mm (277x) 8th magnitude orange star and a very wide 1 delta mag B.
★★ STT216 7m4 10m3 2.3'' 231° 2016 Leo 10h22m43.81s +15°20'39.70"

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

Mark McCarthy
Fremont (California/USA)
317mm (277x) A white and bright (7.3), B red & much fainter (10.3), a close split (2").
Mark McCarthy
Fremont (California/USA)
508mm (333x) Yellow and very much fainter orange B, 1 delta mag, ~4" separated
A1990 9m5 9m6 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 10m1 10m4 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
STTA104 7m2 7m3 209.0'' 287° 2013 LMi 10h24m22.19s +34°10'35.00"
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 9m1 9m3 0.8'' 155° 2017 Leo 10h25m01.79s +24°36'44.10"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tough. Faint, need averted vision to brighten and sharpen. Elongated to clean split in the best moments with seeing, near equal magnitude
Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated to hairline at 333x, split at 533x. Light orange stars, near equal
POU3080 9m7 10m9 5.6'' 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 9m1 10m5 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
STF1431 7m8 9m1 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
STT217 7m8 8m6 0.8'' 149° 2017 Leo 10h26m53.01s +17°13'09.90"

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

Mark McCarthy
Fremont (California/USA)
508mm (333x) Just split cleanly, ~1 delta mag, yellow-tinged white stars. Nice close pair
STF1434 9m5 9m7 6.4'' 282° 2018 Leo 10h27m08.41s +18°03'44.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Near equal white, wide
HJ832, 45 Leo 6m0 12m4 34.3'' 121° 2012 Leo 10h27m38.99s +09°45'44.70"
Uwe Pilz
Leipzig (Germany)
105mm (260x) nicht schwierig
HU879, bet LMi 4m6 6m0 0.5'' 228° 2017 LMi 10h27m53.09s +36°42'26.90"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) Beta LMi. With apodizing mask I see an out of roundness / olive shape, too much glare to tell orientation, no other field stars
A2152 AB 9m6 9m1 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
HEI762 10m5 11m4 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 8m3 8m9 1.4'' 73° 2019 Leo 10h30m06.42s +20°48'04.30"

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

Mark McCarthy
Fremont (California/USA)
508mm (333x) Very clean images, light yellow-orange stars, ~1 delta mag, well split, very pretty
ES1905 AB 8m6 12m6 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.
STF1441 AB 6m5 8m8 2.8'' 167° 2015 Sex 10h30m58.78s -07°38'15.20"
AC 6m5 10m1 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 10m1 10m4 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 5m9 11m8 57.7'' 247° 2014 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.
STF1442 8m2 8m5 13.3'' 157° 2017 Leo 10h31m58.95s +22°02'22.00"
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 7m5 9m1 0.1'' 38° 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 9m9 10m0 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
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201443.png
STF1446 9m3 10m0 5.5'' 250° 2018 Leo 10h33m33.32s +15°12'49.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Two faint stars, pretty well separated, 1 delta mag.
STF1447 7m5 8m9 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) Faint white and red-orange, PA to the east, pretty wide 6". Nice pair.
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 7m5 13m6 3.5'' 184° 1920 Leo 10h34m23.24s +21°35'36.40"
STF1448 AC 7m5 9m6 10.9'' 259° 2011
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 5m8 7m9 2.2'' 156° 2017 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 9m8 12m2 8.5'' 271° 2015 Leo 10h35m24.86s +26°16'09.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy pair, wide, ~1 delta mag
STF1454 9m0 11m0 1.3'' 358° 2016 LMi 10h38m11.10s +26°36'24.80"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Quite tough: averted vision only, very tight, similar magnitude, when seeing stills.
STF1456 8m2 9m8 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 7m0 11m7 4.0'' 339° 2015 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 7m7 8m2 1.9'' 334° 2019 Sex 10h38m43.14s +05°44'02.90"

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

René Merting
Drachhausen (Germany)
100mm (142x) bei 107x sehe ich in guten Momenten eine Stäbchen, manchmal auch schon leichte Einschnürungen - bei 142x zeigt sich das Sternpaar deutlich als 8 und mit etwas Geduld auch getrennt - B steht im NO und ist eine halbe Größenklasse schwächer - bei 213x dann eindeutige Trennung
Mark McCarthy
Fremont (California/USA)
508mm (333x) Attractive bright sunny yellow pair, more than 2" separation, slight mag difference
J79 9m0 10m1 1.5'' 132° 2017 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 10m7 12m2 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 8m5 10m4 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 8m3 8m8 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
STF1460 8m7 8m9 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.
J1369 10m1 11m7 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 8m3 10m3 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 8m3 8m8 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 9m4 11m4 2.2'' 227° 2001 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 6m9 8m4 0.6'' 240° 2018 Sex 10h42m37.53s +03°34'58.90"

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

Mark McCarthy
Fremont (California/USA)
317mm (277x) Feels like a not round disk, but uncertain.
Mark McCarthy
Fremont (California/USA)
508mm (533x) 34 Sex. Surprisingly difficult. Light orange A and a very small 2 delta mag pin prick appears within the first diffraction ring, so about 0.5" separation. Very tough. With seeing only
BU913, 40 LMi AB 5m5 12m6 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.
STF1465 9m8 10m1 2.2'' 11° 2019 UMa 10h43m13.35s +44°37'41.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal well split ~3". 9th-10th mag.
STF1466, 35 Sex AB 6m2 7m1 6.9'' 241° 2018 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 5m2 7m3 288.0'' 88° 2018 UMa 10h43m32.89s +46°12'13.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 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 9m2 9m7 0.6'' 112° 2018 Sex 10h44m38.71s +05°29'55.00"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated with 333x but a good clean split with 533x. Stars settle to fine points with seeing , ~1 delta mag, ~0.5" separation
STF1468 9m7 9m7 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 8m6 10m8 3.9'' 288° 2018 UMa 10h45m15.60s +44°58'11.20"
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.
S612 & ARN3, 42 LMi S612 AB 5m3 7m8 196.2'' 174° 2015 LMi 10h45m51.91s +30°40'56.60"
ARN3 AC 5m3 8m3 424.6'' 94° 2013
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
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 42 LMi: Very bright white and 3 delta mag orange B, very wide separation.
STT228 8m2 8m9 1.7'' 170° 2017 Leo 10h47m16.93s +22°34'32.00"

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

Mark McCarthy
Fremont (California/USA)
508mm (533x) With fine focus, split with seeing, ~1 delta mag, ~1" separation. Pretty tough needed 533x to split, elongated at 333x
STF1469 AB 7m7 10m4 10.9'' 324° 2015 UMa 10h47m43.86s +65°27'36.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White and 2x fainter B, wide.
★★ STT229 7m6 7m9 0.7'' 256° 2017 UMa 10h48m02.55s +41°06'35.80"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Just wider than a thin hair split of equal white stars, ~8th mag. 0.63"! in 40 years it will be 0.2"
A2572 9m8 10m1 0.8'' 121° 2015 Sex 10h48m48.88s +01°24'12.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Hairline split, white, near equal
STF1476, 40 Sex 7m1 7m8 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 9m9 10m9 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 9m8 11m0 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]
STF1482 8m2 9m2 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
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein enges Pärchen, knapp getrennt - Helligkeitsunterschied eine dreiviertel Größenklasse - A strahlt warmweiß, B reinweiß
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 9m9 11m1 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 6m2 8m7 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 9m5 9m6 2.4'' 244° 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 8m7 11m9 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 7m4 11m5 34.1'' 59° 2015 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 9m2 10m1 0.9'' 47° 2015 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 8m4 9m7 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 4m5 6m3 6.8'' 112° 2019 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.
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 11m4 11m9 4.2'' 222° 2015 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 8m0 10m2 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
STF1491 AB 8m4 11m3 14.1'' 33° 2017 UMa 10h58m50.42s +61°42'56.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange and blue, pretty wide, ~3 delta mag.
STF1495 7m2 8m8 34.2'' 36° 2016 UMa 10h59m49.47s +58°54'23.30"
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
UC2059 & HDS1574 & COU1422 UC2059 AB 7m5 10m7 46.9'' 46° 2015 UMa 11h01m45.73s +36°40'41.60"
HDS1574 Aa-Ab 7m6 11m1 0.2'' 26° 2019
COU1422 Ba-Bb 11m2 11m5 0.6'' 38° 2008

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) UC2059 (AB): Pretty well separated, 1.5 delta mag, not remarkable as I hoped given the odd designation.
Mark McCarthy
Fremont (California/USA)
762mm (1219x) COU1422 (Ba-Bb): Cou 1422 is a pair of 11th magnitude stars very close to UC 2059 -- best I could get of Cou 1422 was an elongation with the seeing. Tried 1219x without improving the elongation.
COU961 AB 7m2 9m4 1.2'' 328° 2016 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"]
BU1077, alpha UMa, 50 UMa, Dubhe AB 2m0 5m0 0.8'' 342° 2017 UMa 11h03m43.84s +61°45'04.00"
AC 2m0 7m2 370.0'' 205° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: 2020-04-07: Very wide, uneven & inconspicuous pair. A appeared white-yellowish, for B I could not detect any color.
STF1504 7m9 8m1 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)
317mm (553x) White near equal, ~2", nice.
HZG8, 51 UMa AC 6m0 7m6 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"
★★ HO378 AB 8m2 9m1 1.1'' 237° 2017 UMa 11h04m57.29s +38°24'38.20"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) In a pretty cluster in the finder (~ 12 stars loose and poor, wide magnitude range, triangle shape). Pair is a fine split 1 delta mag 1", ice blue A and slightly yellow B.
VBS18 & CSN7, WX UMa VBS18 AB 8m8 14m6 32.0'' 125° 2017 UMa 11h05m27.65s +43°31'38.70"
CSN7 AC 4m8 7m5 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 8m9 10m6 8.2'' 312° 2015 UMa 11h05m41.23s +62°37'01.50"
AC 8m9 12m0 217.7'' 177° 2015
Robert Zebahl
Leipzig (Germany)
70mm (80x) AB: 2020-04-14: Easy split with pretty dim companion.
★★ BU599, 65 Leo 5m7 9m7 2.8'' 106° 2015 Leo 11h06m54.20s +01°57'19.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright light orange star. As seeing resolves it to a disk and eliminates the diffraction, a tiny, faint star appears, planet-like, (~3") from the star. Only at the best moments, visibility of B star helped by averted vision.
STF1511 9m3 9m5 7.6'' 287° 2015 Leo 11h07m11.56s +10°54'48.20"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Plain white pair, near equal, wide
STF1510 7m7 9m0 5.7'' 328° 2019 UMa 11h08m00.06s +52°49'17.90"

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

René Merting
Drachhausen (Germany)
100mm (64x) bei 32x wirkt der Stern leicht länglich - bei 64x dann gelingt die Trennung - Komponente B hängt nordwestlich über A und ist mehr als eine Größenklasse schwächer - ein schönes enges Paar bei dieser Vergrößerung - B wirkt trotz des Größenunterschiedes nicht so schmutzig grau, wie es sonst immer ist
STF1512 9m3 9m5 9.9'' 51° 2015 UMa 11h09m13.09s +62°29'51.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty, near equal bluish-white stars
STF1514 9m5 10m6 1.3'' 341° 2015 UMa 11h11m38.55s +66°06'48.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extremely fine! It is at the base of a kite asterism, the fainter star of four. The three arcing the top of the kite are equal magnitude. STF 1514 is a very tight 1.5" but clean split, 1 delta mag. Nice!
ENG45 AB 7m2 8m3 135.0'' 247° 2016 UMa 11h11m48.95s +42°49'55.60"
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, white, 0.5 delta mag.
HO50 6m5 8m4 3.0'' 35° 2017 UMa 11h13m40.09s +41°05'19.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Good disk of A star with momentary perfection, but cannot see B, I think the magnitue in WDS is overstated.
Mark McCarthy
Fremont (California/USA)
762mm (457x) The pair split immediately at 457x. A little diffraction but no doubt a small blue point just outside the first ring. Using the 8-inch aperture mask (effectively 8-inch f/18!) had a nice star image of A but B disappeared -- it became an averted vision, threshold object. Barlow here was no help to show it better. I think Ho 50B is fainter than the current data, and if the older data say it should be fainter, then it may well be variable. However, later in the night, I estimated Ho 50B to be as bright as STF 1964D, which is 9.02
STF1517 & BU1431 STF1517 AB 7m5 8m0 0.7'' 314° 2017 Leo 11h13m40.99s +20°07'43.30"
BU1431 AB-C 7m5 10m8 246.1'' 97° 2015

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

Robert Zebahl
Leipzig (Germany)
102mm (187x) STF1517 (AB): 2020-03-28: At 187x the double star immediately appears elongated, but without notching. On closer observation, the slight difference in brightness could be detected. Not better at higher magnifications. Observation at quite good seeing (4/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) STF1517 (AB): länglich ../projects/double-stars/uwe-pilz/sketches/200327stf1517.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) STF1517 (AB): 2020-03-27: Clearly elongated. In some moments the double star appeared notched with a small difference in brightness. Observation at moderate seeing (3/5).
Mark McCarthy
Fremont (California/USA)
317mm (340x) STF1517 (AB): Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (533x) STF1517 (AB): Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal
STT573, del Leo ? AB 2m5 10m9 202.7'' 341° 2014 Leo 11h14m06.51s +20°31'25.80"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x habe ich zunächst den 9.7 mag hellen Stern SAO 81724 westnordwestlich für Komponente B gehalten - Komponente B habe ich auch gesehen, sie aber für einen weitere Komponenten gehalten - B stand nur 1/3 soweit nördlich von A und ist noch schwächer - Helligkeitsunterschied nicht abschätzbar - der Doppelstern ist kein Burner
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x nicht wirklich eine Freude - Komponente B steht zu weit entfernt nordöstlich von A - ein grauer Minikleks gegen den gleißend hellen weißen Stern Zosma (Delta Leo)
BU1283 9m8 10m4 0.3'' 174° 2010 Leo 11h14m24.68s +15°30'51.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated at 533x, but the sky is too hazy, and this pair is a bright star's glare. BU 1283 looks like a piece of debris from an exploding bright star. [Theta Leo, 3.33v, to the SW]
STF1521 7m7 8m1 3.8'' 97° 2019 Leo 11h15m20.95s +27°34'15.60"
Robert Zebahl
Leipzig (Germany)
70mm (67x) At 44x still very close, finely separated pair with visible difference in brightness, rather faint. At 67x nicely separated, at 100x very easy. Colors were not clearly visible.
René Merting
Drachhausen (Germany)
100mm (107x) bei 64x sehe ich eine Ameise, die Komponenten A und B etwas gleich hell, noch nicht getrennt - bei 107x sind beide etwas mehr als knapp getrennt zu erkennen, B im Osten ist etwas schwächer
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/STF%201521.png
★★ STF1519 9m0 9m9 1.5'' 289° 2017 UMa 11h15m36.65s +59°46'43.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 1 delta mag, tight 1.5" faint yellow stars.
STF1520 6m5 7m8 12.4'' 344° 2017 UMa 11h16m04.03s +52°46'23.40"
Robert Zebahl
Leipzig (Germany)
70mm (44x) 2020-04-08: At 22x pretty tight, uneven pair. A appeared orange, B did not show any clear color. At 44x, A appeared yellowish-orange, B silvery grey, partly grey-bluish.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein knapp getrenntes Pärchen, auffällig im Umfeld - Komponente B ist eine Größenklasse schwächer - zurück auf 20x noch schönerer Eindruck, beider Sterne können noch ganz knapp getrennt voneinander gesehen werden
★★ STF1523, xi UMa, 53 UMa, Alula Australis AB 4m3 4m8 2.1'' 155° 2019 UMa 11h18m10.90s +31°31'45.00"

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

Robert Zebahl
Leipzig (Germany)
55mm (83x) 2019-02-09: Already seen as '8' at 83x. At 125x the overlapping of both Airy disks was visible, but also a slight difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_xi_uma.jpg
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2018-02-18: Very close together with similar brightness. At first glance seen as an '8', looking closer I partly split both components. Similar view also at 128x.
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-03-15: Splendid sight! Beautifully separated with almost touching diffraction disks. The rather small difference in brightness was well visible. The diffraction rings of both components coalesced.
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-16: Awesome! Bright with lovely, subtle diffraction rings. The distance between both components is a smaller than the diameter of the diffraction disk of the fainter component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Gemessen: 162°
Robert Zebahl
Leipzig (Germany)
120mm (168x) 2018-02-14: Well split with slight difference in brightness.
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2019-02-06: Well split with visible difference in brightness. The colors of both components appeared equal.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Alula Australis. Short period. Pretty orange-yellow stars, ~half delta mag, ~2" separation
STF1524, nu UMa, 54 UMa, Alula Borealis AB 3m6 10m1 7.5'' 149° 2018 UMa 11h18m28.74s +33°05'39.50"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Tight white near equal pair.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Alula Borealis. Bright orange A and B is a neat little white point well separated and very much fainter
STT233 AB 7m2 10m2 4.7'' 335° 2015 UMa 11h18m46.75s +66°41'03.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White with 3-4x fainter B, well separated. ~10th mag. Seeing needs to still.
WNC3 9m0 10m5 6.7'' 208° 2017 UMa 11h18m58.50s +51°18'12.70"
René Merting
Drachhausen (Germany)
320mm (72x) Zenitbeobachtung - bei 72x ist Komponente B mit leichtem Abstand getrennt von A erkennbar - Helligkeitsunterschied zwei Größenklassen - Komponente A wirkt gelblich, B kommt ohne Farbe aus, das reicht aber für einen kleinen feinen Farbkontrast
STF1527 7m0 8m0 0.4'' 279° 2017 Leo 11h18m59.91s +14°16'06.90"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) At 205x I know something is up with this star. At 333x it is overlapping disks and notched. At 533x it is still only notched but a bit larger and hazier
STF1525 9m9 9m9 2.3'' 173° 2019 UMa 11h19m29.37s +47°28'12.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal faint, 9th-10th mag, 3".
COU1259 10m4 10m9 0.7'' 311° 2016 UMa 11h20m19.91s +36°03'58.30"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Smudgy elongation. Not quote resolved. Conditions seem to be deteriorating
STF1534 8m1 11m1 5.1'' 315° 2017 Leo 11h21m49.34s +18°11'24.00"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) Orange-yellow A, very faint B brightens with averted vision, but can hold direct. Wide, ~3 delta mag
BRT2411 10m7 11m6 3.1'' 316° 2015 Leo 11h23m02.19s +20°07'21.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Visible with direct vision but averted vision makes the pair glitter and flash like Christmas lights. ~3", ~1 delta mag
STF1536, iota Leo, 78 Leo AB 4m1 6m7 2.2'' 96° 2018 Leo 11h23m55.37s +10°31'46.90"
AB-C 4m1 11m1 332.1'' 346° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: 2020-03-28: The companion was well visible as brightening on the diffraction ring of the primary component. Sketch see observation with my 102mm refractor.
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: 2020-03-28: At 125x clearly separated. A very beautiful sight! The companion was visible as almost round brightening close to the first diffraction ring of the primary component. The diffraction ring itself appeared very fine. At 224x also a very nice sight with a clear diffraction ring and the companion, which now appeared roundish. ../projects/double-stars/robert-zebahl/sketches/2020-03-28_iota_leo_stf1536.jpg
Mark McCarthy
Fremont (California/USA)
317mm (340x) AB: Quite close, very bright yellow white A and brownish B, split in A's diffraction ring.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Iota Leo. Light orange A and a richer orange B, ~2 delta mag, ~2" separation
HDS1622 AB 8m5 11m3 0.7'' 37° 2018 Leo 11h24m15.66s +13°54'06.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Tough. B appears with averted vision only, just a brightening haze to A
STF1537 8m2 9m1 2.3'' 358° 2019 Leo 11h24m28.94s +20°37'16.50"
René Merting
Drachhausen (Germany)
100mm (107x) bei 64x stäbchenförmig - bei 107x zeigt sich das Paar wie eine 8, die keine mehr sein will - in ruhigen Momenten ist eine knappe Trennung erkennbar - Komponente B steht nördlich von A und ist nur unwesentlich schwächer
Robert Zebahl
Leipzig (Germany)
102mm 2020-03-27: At 62x almost, at 86x clearly separated, whereby the components are still very close together. The companion appears rather dim. The slight difference in brightness is already visible at 62x. At 125x the double star shows itself clearly separated. The primary component appears more white, the companion appears a bit warmer in color.
Robert Zebahl
Leipzig (Germany)
152mm 2020-03-27: At 49x the double star presents itself clearly elongated, at 69x it is almost separable. The two diffraction disks are well visible. At 100x very nicely separated at still quite small separation. The primary component appears rather white, the companion shows up in a warmer hue. A moderate difference in brightness is visible.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Nice wide split, clean view, ~1 delta mag, ~3" separation, light yellow color A, B is bluish
HJ4433, 81 Leo AB 5m6 10m8 55.4'' 2018 Leo 11h25m36.37s +16°27'23.50"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ploppt Komponente B weit getrennt nördlich von A auf, vorher war sie unsichtbar - B versteckt sich halb im Glanz von A - schönes Versteckspiel
Mark McCarthy
Fremont (California/USA)
317mm (170x) bright orange-yellow A with a much fainter blue B, widely separated, a beautiful sight.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 81 Leonis: Bright yellowish A, very faint bluish B, wide separation
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x strahlt Komponente A gleißend hell und leicht gelblich - B zeigt sich gut abgesetzt ganz schwach im NO von A - kein echtes Doppelstern-Feeling - bei 72x verliert A ein wenig Farbe, B ist ein graues Pünktchen
HEI157 9m5 10m5 1.6'' 157° 2015 Leo 11h26m20.44s +16°10'05.70"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Faint pair, B is just visible with averted vision but can see it well enough
★★ STF1540, 83 Leo AB 6m5 7m5 28.4'' 150° 2018 Leo 11h26m45.32s +03°00'47.20"
Stefan Loibl
Rosenheim (Germany)
10x50 clearly split, little difference in magnitude
René Merting
Drachhausen (Germany)
18x70 ein ordentlich getrenntes und dennoch schön eng stehendes Pärchen - Komponente A ist leicht gelblich, Komponente B im SO ist eine dreiviertel Magnitude schwächer und grauweiß
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, in same field as Tau.
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A and reddish B wide separation.
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x steht das Paar zwar weit auseinander, es wirkt aber trotzdem gut zusammengehörend - Komponente B im SO ist eine dreiviertel Magnitude schwächer
STF1541 8m0 10m1 7.8'' 27° 2015 UMa 11h27m39.46s +46°17'33.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow-white and slight blue, 1-1.5 delta mag, wide ~4".
★★ STFA19, 84 Leo, tau Leo AB 5m0 7m5 89.2'' 181° 2019 Leo 11h27m56.23s +02°51'22.50"
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with 83 Leo stunning view. Noticeable unequal. A appeared white-yellowish with a hint of orange, B grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, the A star is prismatic in color effects, bluish B
Mark McCarthy
Fremont (California/USA)
317mm (340x) Bright yellow A, bluish B, very widely separated
STF1543, 57 UMa AB 5m3 10m7 5.1'' 354° 2018 UMa 11h29m04.12s +39°20'13.10"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 57 UMa. A is a pale yellow, B a neat orange, ~3 delta, wide ~6"
STF1539 8m5 9m8 19.4'' 313° 2015 Cam 11h30m18.10s +81°02'14.30"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein ganz feiner Doppelstern, ordentliche Trennung - Komponente A ist grau-weiß und die gut eine Größenklasse schwächere Komponente B … hm strahlt erstmal farblos, je länge ich drauf schaue, desto mehr rot-bräunlicher wird der Eindruck
STT234 7m5 8m1 0.4'' 181° 2017 UMa 11h30m49.91s +41°17'12.70"

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

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Surprisingly tough. Had indications of elongation at powers starting from 533x, but needed 1067x to get the clear bump, but even then it wasn't cleanly split
STF1544 7m3 8m0 12.2'' 91° 2016 UMa 11h31m18.57s +59°42'03.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x beautifully separated, moderately bright with visible difference in brightness. The components are still quite close together and appear white-bluish and slightly orange. At 31x same color impression.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x der Prototyp des idealtypischen engen Doppelsternpaares - zwei schön aneinander geschmiegte Sterne, knapp getrennt - Komponente B im Osten ist eine halbe Größenklasse schwächer
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein gut getrenntes helles Pärchen - Komponente B ist maximal eine Dreiviertel Größenklasse schwächer - A strahlt chremeweiß, B kühler in der Ausstrahlung, deswegen ist ein kleiner feiner Farbkontrast erkennbar
STF1547, 88 Leo AB 6m3 9m1 15.5'' 332° 2018 Leo 11h31m44.94s +14°21'52.20"

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

Robert Zebahl
Leipzig (Germany)
55mm (42x) Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x erscheint Komponente B nordwestlich von A etwas mehr als knapp getrennt ganz schwach, bestimmt 3 Größenklassen Helligkeitsunterschied - Komponente A warmweiß, B ist grau
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Der Doppelstern ist getrennt.Bläulich-weiß - orange-leicht rötlich. Etwas schwächerer Begleiter.
Mark McCarthy
Fremont (California/USA)
317mm (340x) Bright yellow A, 3x fainter red B. Wide separation.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 88 Leonis: A favorite! Yellow and blue pair, wide
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x ein schönes enges Sternpaar, ordentlich getrennt - Komponente A strahlt hellgelb, B ist deutlich schwächer und empfiehlt sich mit einem Kupferton - ein schöner Farbkontrast
STF1546 7m5 10m3 11.5'' 349° 2015 UMa 11h32m20.34s +56°05'43.30"
Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-04-19: Separated with a clear difference in brightness - the companion was rather dim. The primary component appeared creamy white.
★★ STT235 AB 5m7 7m5 0.9'' 43° 2017 UMa 11h32m20.76s +61°04'57.90"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Yellow and orange, 1.5 delta mag, split when seeing shows perfect disks. The stars both show albedo effects, look like suns / globes with shadowing.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Short period. Pretty yellow A, orange B, ~1" ~2 delta mag
HDS1642 AB 6m6 9m4 1.2'' 245° 2018 Leo 11h34m09.95s +11°01'25.90"
Mark McCarthy
Fremont (California/USA)
203mm (533x) Can flash B into view with averted vision. Marginal
★★ STF1552, 90 Leo AC 6m3 9m8 63.4'' 235° 2018 Leo 11h34m42.50s +16°47'48.90"
AB 6m3 7m3 3.1'' 209° 2018
Robert Zebahl
Leipzig (Germany)
55mm (42x) AB: A and B very tight and unequal. Much fainter component C very wide apart. All components almost in line. Very nice view. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_90_leo.jpg
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 64x wirken die Komponenten A und B wie eine 8 - bei 142x dann die Gewissheit, B ist jetzt allein erkennbar, vom Positionswinkel südwestlich, aber etwas südlicher als C - Helligkeitsunterschied eine dreiviertel Größenklasse - B wirkt hellorange gegen die weiße Komponente A
AC: bei 32x ist Komponente C ziemlich weit südwestlich von A erkennbar - Helligkeitsunterschied mindestens 2.5 Größenklassen
Sarah Gebauer
Germany
150mm (30x) AB: einfach zu trennen, erst bei 83x, dann auch bei 30x, sehr feine Punkte mit sichtbarem Helligkeitsunterschied ../projects/double-stars/sarah-gebauer/sketches/20200415%2090%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (170x) AB: 90 Leonis, a close but easily split pair at 170x, a yellow-white A and a bluish-white B.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: 90 Leo. Blazing white pair, ~1 delta mag, ~3"
STF1556 10m7 10m8 9.1'' 52° 2015 Leo 11h36m17.58s +12°07'50.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Wide near equal, white stars
STF1555 & HJ503 STF1555 AB 6m4 6m8 0.8'' 149° 2016 Leo 11h36m17.94s +27°46'52.70"
HJ503 AB-C 5m8 11m2 22.5'' 156° 2016

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

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

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

Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-04-19: At 22x medium bright double star with apparently similar bright components. At first sight visible as '8', on closer look separated. At 31x very fine split of the components with small difference in brightness. The two components appeared yellowish and slightly orange.
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x sehe ich zwei fast gleich helle Sterne ganz eng beieinander stehen, da passt sprichwörtlich kein Blatt Papier dazwischen - bei 72x Helligkeitsunterschied eine knappe halbe Magnitude - ein ganz feiner Farbunterschied, Komponente A leicht weißgelblich, B im Osten wirkt ein bisschen grau
STF1561 AB 6m5 8m2 8.9'' 247° 2017 UMa 11h38m44.90s +45°06'30.30"
AC 6m5 9m5 176.8'' 90° 2015
AD 6m5 7m6 718.2'' 76° 2015
AE 6m5 12m1 60.7'' 338° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (31x) AB: 2020-04-19: At 22x separated, but relatively tight together with significant difference in brightness. The pair stands close to 2 medium bright stars. Both components appear white. At 31x beautiful sight, the color of the components looks slightly different: white-yellowish with darker ( slightly orange?) companion.
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: 2020-04-07: At 22x separated. The fainter companion is still very close to the primary component. At 44x beautiful sight with a clear difference in brightness. A: slightly yellowish, B: pale bluish.
STF1559 6m8 8m0 1.9'' 328° 2017 UMa 11h38m49.11s +64°20'49.40"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-04-14: Two clearly visible, slightly touching diffraction disks. The fainter companion appeared somewhat more diffuse. Occasionally the double star appeared separated. ../projects/double-stars/robert-zebahl/sketches/2020-04-14_stf1559.jpg
STF1564 8m8 9m3 5.0'' 87° 2018 Leo 11h39m37.84s +26°57'23.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pretty gold and blue pair, wide, ~1 delta mag
STF1566 8m7 10m0 2.4'' 349° 2017 Leo 11h40m38.67s +21°02'11.30"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Orange-yellow A and light yellow B, close but resolvable
STT575, 62 UMa AB 5m8 9m8 44.0'' 311° 2018 UMa 11h41m34.26s +31°44'45.80"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x habe ich B zunächst suchen müssen - Komponente A ist schön hell, B zeigt sich in ordentlichem Abstand nordwestlich von A, Helligkeitsunterschied 3 Magnituden - zurück auf 20x kann ich B auch noch wahrnehmen, aber nur weil ich wusste, wohin ich schauen muss
Mark McCarthy
Fremont (California/USA)
317mm (443x) 62 UMa. Bright and 3 delta mag wide B.
HU888 9m4 9m7 0.5'' 179° 2016 Leo 11h42m50.96s +21°04'49.50"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Hairline split, with seeing. Noticeable mag difference. Tough
STF1568 10m4 10m5 9.2'' 43° 2015 Vir 11h43m16.61s +00°45'40.10"
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201568.png
HU729 7m1 10m9 1.5'' 347° 2016 UMa 11h47m50.02s +49°49'22.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White star resolves to disk with seeing, but B not there. Apodizing mask did not help resolve.
STFB7, 93 Leo AB 4m6 9m0 74.9'' 355° 2018 Leo 11h47m59.23s +20°13'08.20"
Stefan Loibl
Rosenheim (Germany)
10x50 weak companion directly visible most of the time
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x extrem weit getrennt, Komponente B im Norden ist mindestens 3 Größenklassen schwächer - A wirkt cremeweiß, B ist eine graue Maus - kaum weitere Sterne im unmittelbaren Umfeld
BU603 AB 6m0 8m5 1.0'' 329° 2018 Leo 11h48m38.71s +14°17'03.20"

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

Uwe Pilz
Leipzig (Germany)
105mm (288x) nicht getrennt
Mark McCarthy
Fremont (California/USA)
203mm (533x) Suspected at 205x and 333x but needed higher magnification to see it. B is a very small point, with seeing, in the first diffraction ring. ~1" and ~3 delta mag
STF1573 7m5 8m3 10.9'' 180° 2017 Dra 11h49m10.50s +67°19'42.80"
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein schön anzusehendes Farbkontrastpaar - B im Süden ist eine knappe Größenklasse schwächer - A cremegelb, B weißblau
ARG101 6m3 9m3 45.8'' 273° 2018 UMa 11h51m09.51s +33°22'30.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White star 8th mag, with very faint 2 delta mag very wide B.
BRT1275 10m0 10m2 2.9'' 69° 2017 Leo 11h51m41.69s +16°13'46.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) White, half delta mag, ~3". Pleasing pair, though not physical
STF1575 7m4 7m9 30.5'' 211° 2018 Vir 11h51m57.57s +08°49'48.00"
René Merting
Drachhausen (Germany)
18x70 ein sehr komfortabel getrenntes Sternpaar - B im Südwesten ist eine halbe Größenklasse schwächer - A weißorange, B weißbläulich - ein ansehnlicher FG-Stern
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schön getrenntes Sternpaar mit zwei ähnlich hellen Sternen - Komponente B im SW ist maximal eine halbe Größenklasse schwächer - deutlich wahrnehmbarer Farbkontrast, A ist weißgelb, B dagegen wirkt blaugrau
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x zwei gleichhelle Sterne, die weit getrennt auseinander stehen - A im NO ist leicht gelblich, B mit einem leichten Schlag ins Blaue, sprich weißblau - dadurch zarter Farbkontrast - beide Sterne sind schön hell und auffällig im Umfeld
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201575.png
TDS8089 9m9 10m1 0.4'' 100° 1991 Leo 11h52m32.77s +22°42'41.90"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Marginal. Extremely faint B, only in a moment of perfect seeing, near reddish star
SHJ132 AB 6m9 10m2 39.0'' 14° 2015 Leo 11h52m46.22s +15°26'10.70"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x zeigt sich Komponente B ganz schwach und steht in komfortablem Abstand zu A - Helligkeitsunterschied 3 bis 4 Magnituden - zurück auf 20x ist B noch gerade so zu erkennen, bei immernoch ordentlicher Trennung
STF1577 10m1 11m3 8.6'' 10° 2017 Leo 11h53m19.61s +20°19'11.10"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Wide, white, ~1 delta mag
WOR20 11m2 11m4 1.2'' 288° 2015 Leo 11h54m25.71s +15°15'12.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) With seeing the elongated smear resolves into two faint points, very tight ~1"
A2485 9m5 12m4 2.3'' 216° 2015 Leo 11h54m29.83s +17°34'57.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Really needed averted vision to see the B star, faint pair
STF1579, 65 UMa AB-C 6m7 8m3 3.8'' 40° 2017 UMa 11h55m05.74s +46°28'36.60"
AB-D 6m7 7m0 62.5'' 114° 2018
Robert Zebahl
Leipzig (Germany)
8x40 AB-D: 2020-04-05: Immediately conspicuous in the field. Medium bright double star with slightly uneven components. Western component AB appeared slightly orange, component D tended to be bluish.
Robert Zebahl
Leipzig (Germany)
55mm (27x) AB-D: Easy to separate with large distance and very small difference in brightness. The D component showed a bluish tint, the lighter one (AB) a slightly yellowish tint. At higher magnification also the faint C component is visible.
Robert Zebahl
Leipzig (Germany)
55mm (83x) 2019-02-09: AB, C & D easy to split, but the faint C component only appeared as a tiny star. To the south there is the brighter D component. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_65_uma.jpg
Robert Zebahl
Leipzig (Germany)
../projects/double-stars/robert-zebahl/photographs/2020-04-06_65_uma.jpg
KU41 10m1 10m3 5.1'' 68° 2017 Leo 11h55m33.09s +16°53'49.80"
Mark McCarthy
Fremont (California/USA)
203mm (333x) White near equal, ~5"
STF1582 8m1 9m5 12.0'' 76° 2015 Leo 11h56m00.86s +21°58'54.80"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x zeigt sich B sehr schwach, knapp getrennt östlich von A - Helligkeitsunterschied 2 Größenklassen
Mark McCarthy
Fremont (California/USA)
508mm (333x) Nice wide yellowish stars, ~2 delta mag
BRT2289 11m1 11m1 1.6'' 87° 2015 Leo 11h56m07.55s +20°15'08.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very fine near equal white, nice and clean
STT243 9m1 9m7 1.2'' 2017 UMa 11h59m48.70s +53°23'52.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Super tight split ~1", faint, white, 1 delta mag. M109 is nearby just in of FOV. This pair just beneath its core