Double Stars - Complete List

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:

Complete List (Index)

Sketches (Index)
Photographs (Index)

Orbits (Index)

Double/Multiple Stars	3579
Visual Observations	6100
Sketches	498
Photographs	111
Observers	17
	Werner E. Celnik, Berthold Fuchs, Sarah Gebauer, Christopher Hay, Claus-Dieter Jahn, Gerd Kohler, Karsten Kopp, Winfried Kräling, Jens Leich, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, John Raymond, Jörg S. Schlimmer, Frederik Wanink, Robert Zebahl

m₁

m₂

Year

Coordinates (J2000.0)

★★★

STTA254, WZ Cas

7^m.4

8^m.3

57.8"

89°

2018

Cas

00^h01^m15.85^s / +60°21'19.00"

7^m.4

9^m.6

155.4"

324°

2015

7^m.4

10^m.3

181.4"

118°

2016

Christopher Hay Seeheim (Germany)	6x24	AB: Clearly split. A definitely brighter than B. Under a NELM 5m5 sky both components appear weak in these mini-binoculars and no colour impression arises.; WZ Cas is the variable designation of component A of STTA254. This semiregular carbon star has a mean brightness range of 6m8 to 7m7, and can reach extreme values of 6m3 at one end and 8m8 at the other. Perhaps it was too deep in a minimum at the time of observation to show colour with 1 inch of aperture? 15x45 binoculars revealed colour in this night, see observation below.
Christopher Hay Seeheim (Germany)	15x45	AB: Wide split. A orange-red, B no particular colour. NELM 5m5, same night as 6x24 observation above.
Robert Zebahl Leipzig (Germany)	16x70	AB: 2020-08-19: Intense orange & bluish. Very striking.
René Merting Drachhausen (Germany)	16x70	AB: ein schöner Fernglas-Doppelstern - Komponente A im Westen präsentiert sich dunkelgelb (noch nicht orange), B im Osten ist eher weißlich
René Merting Drachhausen (Germany)	18x70	AB: ein sehr auffälliger Doppelstern mit einem schönen Farbkontrast - A strahlt gelb, das kurz davor steht, ins Orange über zu gleiten - B wirkt im Kontrast aquamarin, so dezent wie eine typische PN-Farbe
Robert Zebahl Leipzig (Germany)	80mm (33x)	AB: Nice double star. Brighter component appeared orange, the fainter more bluish.
René Merting Drachhausen (Germany)	100mm (20x)	AB: 20x reicht zwar schon für eine klare Trennung, aber Komponente B im Osten ist nur dumpf grau-blau und noch zu schwach für den schönen Farbkontrast, der sich bei 32x offenbart - Komponente A strahlt dann in einem satten Bernsteingelb, B im Osten gibt sich unterkühlt bläulich - Helligkeitsunterschied 1 bis 1.5 Größenklassen, schwierig abschätzbar wegen der Farben
Robert Zebahl Leipzig (Germany)	102mm (28x)	AB: Splendid view. Primary component clearly orange, secondary blue.
Jörg S. Schlimmer Germany	127mm (136x)	Sehr schöner Farbkontrast
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: WZ Cas: Pretty, deep orange A and very wide half delta mag B, white.
René Merting Drachhausen (Germany)	320mm (45x)	AB: bei 45x ein weit getrenntes Pärchen mit wunderschönen Farbkontrast, Komponente A im Westen ist grell-orange und die gut 1.5 Magnituden schwächere Komponente B ist aquamarin-grau

Robert Zebahl

Leipzig (Germany)

102mm

../projects/double-stars/robert-zebahl/photographs/2019-07-16_wz_cas.jpg

HO208

8^m.2

9^m.8

1.1"

186°

2016

Peg

00^h01^m29.19^s / +30°44'08.70"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Light orange stars, split with 333x. WDS calls it physical and even provides an orbit with a 649-year period, but they do not share parallax ranges (-54%), in spite of a very close 154 AU weighted separation, 1.63/1.15 Msol, the radial velocity delta (15.51) greatly exceeds the escape velocity (6.18) -- so these are not gravitational

BU733, 85 Peg

5^m.8

8^m.9

0.4"

12°

2015

Peg

00^h02^m10.18^s / +27°04'55.60"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

85 Peg. With apodising mask. Difficult, see a brightening with averted vision and foveal coaxing, but does show as faint star briefly. My PA is ENE, which is slightly incorrect. 26.28 year period, this one is widening for apastron in 2035

STF3053

6^m.0

7^m.2

15.2"

70°

2018

Cas

00^h02^m36.08^s / +66°05'56.30"

Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. Fine split with black in-between. A-component slightly orange. Colour of B-component hard to determine because of proximity to and glare of A-component, but does tend towards blue.
Robert Zebahl Leipzig (Germany)	63mm (46x)	Easy to split with noticeable difference in brightness. Brighter component appeared slightly orange, fainter one bluish.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x knapp getrennt, Komponente B östlich ist halb so hell wie A - während Komponente A weiß-gelblich strahlt, zeigt B sich weiß mit einem leichten Stich ins bläuliche
Mark McCarthy Fremont (California/USA)	317mm (553x)	Pretty, orange and blue like Alberio. ~1.5 delta mag.

STF3051

7^m.7

9^m.5

16.8"

23°

2015

Cep

00^h02^m46.53^s / +80°16'56.20"

René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein ordentlich getrenntes Sternpaar, Komponente B im NO ist gerade so erkennbar, gut 1.5 Größenklassen schwächer als A und leicht gräulich - zurück auf 20x sind beide Sterne knapp getrennt zu erkennen
Mark McCarthy Fremont (California/USA)	152mm (175x)	Since this is close to the 0 hour line, the near beginning and end of Struve's catalog meet pretty close to each other in the sky here. A is fairly bright, white, while B is wide and 2 delta mag. WDS says physical, but they do not share parallax ranges, -72%

STF3054

8^m.1

9^m.1

33.6"

181°

2015

Psc

00^h03^m03.76^s / +08°16'14.50"

Christopher Hay Seeheim (Germany)	20x80	Wide apart, no definite colours.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x ein sehr einfacher Doppelstern - Komponente B im Süden steht weit weg von A und ist gut eine Magnitude schwächer - bei 32x strahlt A warm-weiß, B dagegen wirkt matt-blau-grau

STF3055

7^m.3

10^m.3

5.7"

359°

2015

Peg

00^h04^m00.24^s / +12°08'45.00"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Faint yellow-orange A with very small faint blue B to N, ~3" sep.
Mark McCarthy Fremont (California/USA)	508mm (205x)	Easy, wide, 2 delta mag, light yellow A [spectral class F0III yellow]. WDS uncertain, but there is 76% parallax range overlap, 1,076 AU weighted separation, and 2.51/1.19 Msol, so likely gravitational

STT514

6^m.2

9^m.7

5.1"

170°

2015

And

00^h04^m36.60^s / +42°05'33.20"

René Merting

Drachhausen (Germany)

100mm (64x)

bei 64x kommt Komponente B schwach zum Vorschein, Trennung ordentlich - vermutlich ist B für kleinere Vergrößerungen noch zu lichtschwach - bei 107x ist es dann leichter, die B-Komponente zu erfassen

STF3056

7^m.7

8^m.1

0.7"

143°

2018

And

00^h04^m40.09^s / +34°15'54.70"

AB-C

7^m.1

10^m.1

26.3"

4°

2017

AB-D

7^m.1

10^m.6

95.3"

238°

2012

10^m.1

10^m.6

113.1"

227°

2015

René Merting Drachhausen (Germany)	76mm (29x)	AB-C: bei 29x ist nach Norden eine ganz schwache Komponente erkennbar, gut getrennt - AB wirkt leicht gelblich, C eher kupfergrau
Sarah Gebauer Germany	100mm (73x)	die Komponenten AB erscheinen als ein Stern, C liegt nördlich davon und ist wesentlich schwächer und Komponente D, die ähnlich hell wie C erscheint, liegt westlich von AB gesehen

A1250

8^m.2

9^m.7

0.9"

41°

2015

Peg

00^h04^m51.96^s / +30°05'09.40"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Did not resolve at 205x, needed 333x to split, 2 delta mag. WDS uncertain, and unfortunately there is no Gaia data on the secondary

STF3057

6^m.7

9^m.3

3.9"

298°

2015

Cas

00^h04^m54.98^s / +58°31'55.80"

René Merting Drachhausen (Germany)	100mm (64x)	erst bei 64x wird die B-Komponente nordwestlich von A knapp getrennt schwach sichtbar (ich habe eher damit gerechnet) - bei 107x bleibt B schwach, Helligkeitsunterschied zu A mindestens zwei Größenklassen
Mark McCarthy Fremont (California/USA)	152mm (175x)	Double-double with STF 3062. Wide, around 4", 3Dm
Mark McCarthy Fremont (California/USA)	317mm (277x)	White with 2 delta mag blue-white B, 4-5".
René Merting Drachhausen (Germany)	320mm (144x)	bei 144x ein gut getrenntes Paar, bei der Komponente B im NW gut 2 Größenklassen schwächer strahlt - beide Sterne warm weiß

FOX103

6^m.2

10^m.7

13.1"

149°

2015

Peg

00^h04^m55.93^s / +26°38'55.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange A. Very faint B to south, well separated.

BU997

7^m.6

9^m.4

3.8"

338°

2020

And

00^h04^m57.53^s / +45°40'25.60"

René Merting Drachhausen (Germany)	100mm (64x)	knapp getrenntes Pärchen - großer Helligkeitsunterschied - schön zusammen mit dem unmittelbar östlich stehenden Doppelstern STT547
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange and blue, pretty, well separated.

STF3058

7^m.8

9^m.2

12.6"

51°

2015

Peg

00^h05^m09.24^s / +30°19'44.50"

René Merting Drachhausen (Germany)	18x70	das Paar wirkt wie ein Stäbchen, ohne Einschnürung - Trennung nicht möglich
René Merting Drachhausen (Germany)	76mm (29x)	bei 29x ein knapp getrenntes Sternpaar - B im NO ist mehr als eine Größenklasse schwächer, der Stern wirkt weißgrau gegen die weiße A-Komponente
Sarah Gebauer Germany	100mm (146x)	die Hauptkomponente ist etwas heller, die östliche, die bei 136x in deutlichem Abstand steht, ist wesentlich schwächer, das Umfeld kommt eher unspektakulär daher
Mark McCarthy Fremont (California/USA)	152mm (175x)	Wide 1 delta mag. WDS says physical, however the data says otherwise. 4% parallax range overlap, 1,899 AU weighted separation, 2.01/1.39 stellar mass, but its radial velocity delta exceeds the escape velocity, so it won't be gravitationally bound
Mark McCarthy Fremont (California/USA)	508mm (205x)	Easy, wide, 2 delta mag, yellow. [Spectral class F3V+F6V (yellow-white/yellow-white)]. WDS says physical, but there is barely overlap in their parallax ranges (4%), 1,899 AU weighted separation, 2.01/1.39 Msol, and the radial velocity delta exceeds the escape velocity, so these are not gravitational

BU9001

6^m.7

10^m.6

21.0"

235°

2016

And

00^h05^m09.75^s / +45°13'44.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Faint companion, wide separation.

STT547

9^m.0

9^m.2

6.0"

190°

2020

And

00^h05^m41.03^s / +45°48'43.30"

René Merting Drachhausen (Germany)	100mm (32x)	bei 64x klare Trennung - ein relativ schwaches Pärchen - zurück auf 32x stehen beide dichter zusammen und können knapp getrennt werden
Uwe Pilz Leipzig (Germany)	105mm (144x)	Der nahe gelegene ß997 konnte nicht getrennt werden

STF3061

8^m.4

8^m.5

7.8"

149°

2016

Peg

00^h05^m44.45^s / +17°50'25.00"

Robert Zebahl Leipzig (Germany)	70mm (22x)	At 22x tiny pair with similarly bright, close components. Easy to separate at 44x. A small color difference was visible: The brighter component appeared somewhat warmer with a hint of orange, the fainter one slightly bluish.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein knapp getrenntes Pärchen - Komponente B im SO ist nur unwesentlich schwächer - beide weiß - ein schickes enges Paar
Mark McCarthy Fremont (California/USA)	317mm (553x)	Faint, but not too faint, near equal brightness, white, well separated.
Mark McCarthy Fremont (California/USA)	508mm (205x)	Easy wide pair, near equal, very light yellow-white [spectral class F5V+F5V (yellow-white/yellow-white]. WDS calls it physical, but there is no overlap of parallax ranges (-68%), so they are not

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF3061.png

STF3060

9^m.3

9^m.7

3.3"

136°

2020

Peg

00^h05^m55.56^s / +18°04'34.40"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Very close, ~3", equal brightness, pretty faint.
Mark McCarthy Fremont (California/USA)	508mm (205x)	Light orange stars, near equal, well split. [Spectral class F8 (yellow-white)]. WDS physical with a 3804-year period. There is 79% overlap of their parallax ranges, a very close 129 AU weighted separation, 0.75/0.71 Msol, and the radial velocity delta (0.69) is far less than the escape velocity (4.48). so these are gravitational

HU502

7^m.7

10^m.6

2.4"

108°

1991

Cas

00^h05^m57.04^s / +49°37'20.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Hint of brightening, a bit of a smear in the diffraction. Marginal.

HU401

10^m.6

10^m.8

0.9"

36°

2008

Peg

00^h06^m09.44^s / +23°46'25.10"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Steady split with eight, white near equal. WDS uncertain, and the parallax ranges don't overlap (-19%) so these are not gravitational

STF3062, V640 Cas

6^m.4

7^m.3

1.5"

6°

2020

Cas

00^h06^m15.81^s / +58°26'12.50"

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

KU3

10^m.3

10^m.4

0.9"

76°

2010

Peg

00^h07^m28.21^s / +20°29'35.70"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Nice equal white pair, good split. WDS uncertain, but there is 15% of parallax range overlap, 396 AU weighted separation, 1.85/1.81 Msol, so may be gravitational

STTA256

7^m.1

7^m.3

110.9"

113°

2015

And

00^h08^m01.73^s / +31°23'28.40"

René Merting

Drachhausen (Germany)

76mm (29x)

bei 29x ein schickes, sehr helles Paar wie zwei eineiige Zwillinge - beide stehen komfortabel auseinander und strahlen reinweiß

COU246

10^m.1

10^m.7

1.6"

252°

2017

Peg

00^h08^m23.08^s / +18°43'09.20"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Good split, unequal around 1 delta mag, light yellow [spectral type G5 (yellow)]. WDS uncertain, yet there is 38% parallax range overlap, 325 AU weighted separation, 1.38/1.16 Msol, so may be gravitaional

BU483

7^m.0

7^m.7

158.5"

268°

2015

And

00^h09^m03.67^s / +40°50'34.30"

Robert Zebahl

Leipzig (Germany)

8x40

Large distance with significant difference in brightness.

★

GIC2

7^m.8

11^m.5

29.7"

236°

2018

Peg

00^h09^m15.74^s / +25°16'55.00"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

New designation to me: Harry Giclas, Lowell proper motion survey -- the man who hired Robert Burnham! Faint yellow-orange star with fainter and very wide companion. Possible 3rd to make a triangle. (AB seen, 4 stars in system)

★

STF2

6^m.7

6^m.9

0.9"

15°

2019

Cep

00^h09^m20.18^s / +79°42'52.40"

Uwe Pilz Leipzig (Germany)	105mm (198x)	Schneemann-Figur. Abstand 0“91
Mark McCarthy Fremont (California/USA)	152mm (175x)	Light orange stars, very tight, hairline split, near equal mag. Physical with a 540-year period it is to slowly widen. 22% parallax overlap, only 82 AU weighted separation, 2.16/2.10 solar mass
Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt

STF5, 34 Psc

5^m.5

9^m.4

7.6"

159°

2015

Psc

00^h10^m02.18^s / +11°08'44.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Hard white A, very faint but definite small point B to south, 4x fainter.

STF3

7^m.8

9^m.1

5.0"

82°

2020

And

00^h10^m03.18^s / +46°23'25.10"

René Merting Drachhausen (Germany)	100mm (64x)	bei 32x zeigt sich der Stern leicht länglich nach Osten verzogen - bei 64x knappe Trennung, Komponente B ist eine knappe Magnitude schwächer - A weiß, B grau-orange
Uwe Pilz Leipzig (Germany)	105mm (200x)

ARY8

8^m.1

8^m.6

39.2"

101°

2019

Cas

00^h10^m37.25^s / +58°44'53.60"

Mark McCarthy Fremont (California/USA)	80mm (13x)	There's a chain of doubles going south from Beta Cas, a pretty finder view, like stepping stones. The one closest to Beta Cas is Ary 8, which is actually a triple system of wide pairing
Mark McCarthy Fremont (California/USA)	152mm (175x)	Wide trio of near equal mag stars. AB and AC are physical per WDS. Per EDR3, AB has 44% shared parallax ranges, but a very wide 16,943 AU weighted separation, 3.12/2.75 solar mass, so time will need to tell. I do not find data on C. I did not notice AC the Burnham pair, which has a low catalog number indicating 6-inch era discovery, but the year is 1889 which puts it at the Lick 36-inch, discovery separation 0.4"

★

STF7

8^m.0

8^m.5

1.3"

210°

2017

Cas

00^h11^m38.91^s / +55°57'40.90"

Mark McCarthy Fremont (California/USA)	152mm (175x)	Very fine white stars, <1 delta mag, very closely split. WDS is uncertain, but there is 86% overlap of parallax ranges, only 546 AU weighted separation, 3.14/2.78 solar mass, so likely gravitational
Robert Zebahl Leipzig (Germany)	152mm (210x)	Clearly separated with rather close components. Slightly unequal. Pretty double.
René Merting Drachhausen (Germany)	320mm (240x)	bei 240x sind beide Sterne in guten Momenten knapp getrennt erkennbar - A und B wirken gleich hell

STT1

7^m.5

9^m.5

1.6"

212°

2006

Cas

00^h11^m50.44^s / +66°07'34.80"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Nice to have the first in Otto's catalog. Hairline split white A and blue B, 2-3 delta mag. WDS uncertain, and there is -15% parallax range overlap, despite 509 AU weighted separation and 3.17/1.97, it is not gravitational

BU1026

7^m.2

8^m.5

0.4"

330°

2016

Cas

00^h12^m08.05^s / +53°37'26.10"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Split with seeing, 2 delta mag, fairly difficult, PA WNW. Currently 0.345" it will tighten and have a northerly PA by 2040

STT2

AB-C

6^m.3

10^m.4

18.0"

224°

2015

And

00^h13^m23.93^s / +26°59'15.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Yellow A, well separated faint B

STF10

8^m.0

8^m.6

17.5"

176°

2015

Cas

00^h14^m49.33^s / +62°50'25.50"

8^m.0

11^m.1

55.4"

103°

2015

René Merting Drachhausen (Germany)	100mm (20x)	AB: 20x reichen für die Trennung des schön isoliert im Sternumfeld stehenden Paares - Komponente B im Süden ist eine halbe Magnitude schwächer - bei 32x ein Kuriosum beim Farbkontrast für mich, der zwar sichtbar ist, aber nicht richtig greifbar - das Farbenspiel weiß und weißlich-orange scheint immer zwischen beiden ein wenig hin und her zu wechseln
Mark McCarthy Fremont (California/USA)	152mm (175x)	AB: Wide near equal. WDS says physical, but there is no overlap of parallax ranges (-32%)

BU1027

7^m.3

10^m.5

1.7"

192°

2015

Peg

00^h14^m56.33^s / +21°32'31.60"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Easy light orange A and deeper orange B, 3 delta mag, <2". WDS says physical, but their parallax ranges do not overlap (-84%), so they are not gravitational

★

STF12, 35 Psc

6^m.1

7^m.5

11.2"

148°

2019

Psc

00^h14^m58.84^s / +08°49'15.50"

Robert Zebahl Leipzig (Germany)	70mm (22x)	At 22x pretty bright but uneven pair with relatively close components. At 44x the brighter component looked slightly yellowish, the fainter one slightly bluish. The double star could be observed together with STF22 (38 Psc) in the same field of view and stands in nice contrast to it.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow and white, ~1 delta mag, PA to S.
Mark McCarthy Fremont (California/USA)	508mm (205x)	Very bright A, white, wide, 1 delta mag. [Spectral type A9V+F3V (white/yellow-white)]. WDS says physical, but the parallax ranges do not overlap (-17%), so they are not gravitational

BU1342

7^m.6

12^m.5

6.1"

146°

2015

Psc

00^h16^m05.39^s / +08°06'56.20"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Bright white A and faint B seen immediately very well separated. WDS uncertain, and the parallax ranges do not overlap (-13%)

★

STF13

7^m.0

7^m.1

1.0"

49°

2018

Cep

00^h16^m14.02^s / +76°57'03.00"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Equal white stars, hairline split. Nice! Physical with a 1245-year period. 69% parallax range overlap, 173 AU weighted separation, 2.63/2.47 Msol

★★

HJ1947

6^m.2

9^m.8

9.1"

75°

2015

And

00^h16^m21.50^s / +43°35'42.40"

René Merting

Drachhausen (Germany)

100mm (64x)

bei 64x ist Komponente B sehr schwach östlich von A erkennbar - großer Helligkeitsunterschied, kaum abschätzbar, vielleicht 3-4 Größenklassen - schönes Doppel-Doppel zusammen mit STT5 nur 28' östlich - beide Paare haben in etwa die gleichen Helligkeiten und den gleichen Abstand, nur die Positionswinkel sind verschieden - A strahlt weißgelblich

STF16

7^m.7

8^m.8

5.8"

40°

2020

Cas

00^h16^m41.65^s / +54°39'36.50"

Mark McCarthy Fremont (California/USA)	317mm (553x)	White and blue-white, wide.
René Merting Drachhausen (Germany)	320mm (72x)	bei 45x knapp getrennt erkennbar - B im Nordosten ist gut 1.5 Größenklassen schwächer - bei 72 sind beide besser getrennt erkennbar, zudem zeigt sich jetzt ein schöner Farbkontrast. A ist weißgelblich, B ist blaugrau

★

STF19

7^m.1

9^m.5

2.4"

141°

2009

And

00^h16^m43.02^s / +36°37'47.40"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Exceptional! White A, B is very faint and only 1" separated, seen direct vision but just barely. WDS uncertain, but there is 44% parallax overlap, only 312 AU weighted separation, and 2.15/1.29 stellar mass

★

BU392

5^m.7

12^m.5

19.5"

71°

2007

Cas

00^h16^m57.05^s / +61°31'59.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Yellow A star. 12th mag B swims into view with averted vision and seeing, then can hold it direct as a bluish point.

STF20

8^m.9

9^m.7

11.9"

233°

2015

Psc

00^h17^m22.36^s / +16°30'37.50"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Easy, wide light yellow A and blue B, 1 delta. WDS says physical, but the parallax ranges do not quite overlap (-2%, with 3% error), these may not be gravitational

★

STF22, 38 Psc

AB-C

7^m.1

7^m.7

3.9"

234°

2020

Psc

00^h17^m24.50^s / +08°52'34.80"

AB-D

7^m.1

11^m.5

66.8"

151°

2005

Robert Zebahl Leipzig (Germany)	70mm (44x)	AB-C: At 44x separated with almost touching diffraction disks and small difference in brightness. At 57x clearly separated, but still quite close together. It stands in beautiful contrast to the nearby double star STF12 (35 Psc).
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB-C: near equal white pair, well split, B ~1/2 delta mag, PA to SW.
Mark McCarthy Fremont (California/USA)	508mm (205x)	AB-C: Wide pair, easy, one delta mag. WDS uncertain, however there is no overlap of parallax ranges (-94%)

★

ES41

8^m.0

11^m.2

6.3"

220°

2015

Cas

00^h18^m21.55^s / +49°30'35.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

B appeared while putting my eye to the eyepiece -- then disappeared. B needs averted vision to see -- can barely hold it direct vision. Wide, 4 delta mag.

STF24

7^m.8

8^m.4

5.3"

247°

2020

And

00^h18^m30.59^s / +26°08'25.10"

Robert Zebahl Leipzig (Germany)	70mm (66x)	Well split with visible difference in brightness.
Mark McCarthy Fremont (California/USA)	152mm (175x)	Clean split, near equal, yellow-white stars. WDS says physical, however their parallax ranges do not overlap -22%
Mark McCarthy Fremont (California/USA)	317mm (277x)	Near equal white ~5-6"

★★

STT5, 26 And

6^m.1

10^m.1

6.1"

240°

2016

And

00^h18^m42.15^s / +43°47'28.10"

René Merting

Drachhausen (Germany)

100mm (64x)

Komponente B erscheint bei 64x knapp westlich von A und ist nur knapp sichtbar - extrem großer Helligkeitsunterschied - schönes Doppel-Doppel zusammen mit HJ1947 nur 28' weiter westlich, beide Paare haben in etwa die gleichen Helligkeiten und den gleichen Abstand, nur die Positionswinkel sind verschieden

KR4, V377 Cas

8^m.2

9^m.4

2.2"

180°

2020

Cas

00^h19^m14.30^s / +59°42'17.40"

René Merting

Drachhausen (Germany)

100mm (142x)

bei 142x ist Komponente B nur in guten Momenten leicht abgesetzt südlich von A erkennbar - irgendwie habe ich mir den Doppelstern bei den Eckdaten leichter vorgestellt

S384

7^m.0

10^m.3

104.0"

22°

2015

And

00^h20^m00.41^s / +38°13'38.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Widely separated, yellow-white A, 2 delta-mag fainter B.

★

AC1

7^m.3

8^m.3

1.9"

291°

2020

And

00^h20^m54.10^s / +32°58'40.90"

Robert Zebahl Leipzig (Germany)	102mm (125x)	Very attractive, relatively close with a clearly visible difference in brightness. In the immediate vicinity a brighter star shines in a lovely orange. Very nice contrast!
Uwe Pilz Leipzig (Germany)	105mm (200x)	orange. Leuchtend gelber Stern in 5' Abstand
Mark McCarthy Fremont (California/USA)	152mm (175x)	Around half a delta mag, nice and close split. Physical with a 525-year period. At apastron

STF26

AB-C

7^m.5

9^m.9

13.8"

114°

2015

Cep

00^h21^m22.17^s / +67°00'19.50"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein gut getrenntes Pärchen, aber trotzdem eine harte Nuss, weil die ost-südöstliche stehende Komponente C so schwach ist, dass sie nur mit viel Konzentration sichtbar wird bei dieser Vergrößerung - bei 64x dann ist das Erkennen von C leichter
Mark McCarthy Fremont (California/USA)	152mm (175x)	White A and 3 delta mag, fairly wide B. Component of STT 6, which is 7.54/8.77 0.7" 335-year period -- I did not notice any misshape in A, it should be easy in the 20-inch. No Gaia data on A or B so sadly can't calculate

STF27, 42 Psc

6^m.4

11^m.2

28.9"

315°

2019

Psc

00^h22^m25.48^s / +13°28'56.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange, with wide separation blue B, PA to NNW, ~3 delta mag.

ES42

8^m.3

9^m.4

7.1"

207°

2015

Cas

00^h22^m51.76^s / +54°19'44.00"

René Merting Drachhausen (Germany)	100mm (70x)	bei 70x ist indirekt der kleine Begleiter von Es 42 sichtbar
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein eng stehendes, aber gut getrenntes Paar - Komponente B im Süden wirkt 2 Magnituden schwächer (nur 1.1 mag lt. Stelle Doppie)

STF28 & FYM12

STF28

8^m.3

8^m.6

33.2"

224°

2016

And

00^h23^m53.23^s / +29°30'09.10"

FYM12

8^m.3

8^m.9

145.9"

137°

2016

Robert Zebahl Leipzig (Germany)	102mm (28x)	STF28 (AB): 2020-11-02: At 28x beautifully separated, moderately bright with slight difference in brightness. A subtle color difference was visible: pale yellow-orange & pale white-bluish. At 62x a very similar color impression was seen. The double star forms an acute triangle with a faint field star located southeast.
Mark McCarthy Fremont (California/USA)	152mm (175x)	STF28 (AB): Wide, slight mag difference. WDS says physical, but their parallax ranges do not overlap (-68%)
Mark McCarthy Fremont (California/USA)	317mm (277x)	STF28 (AB): Near equal yellow A, white B, wide. A 3rd of similar magnitude in the field, could be part of the system? (it is FYM 12.)
Mark McCarthy Fremont (California/USA)	317mm (277x)	FYM12 (AC): Faint star, very widely separated from STF28 but in the same medium power field, forming a triple

BU488

7^m.4

10^m.3

3.3"

340°

2015

Psc

00^h23^m59.82^s / -03°28'31.00"

Mark McCarthy

Fremont (California/USA)

152mm (456x)

Suspect elongation at 285x, notched and possibly split at 456x at best moments, noticeable magnitude difference. Solar type double with F giant

STT9

6^m.9

9^m.7

2.1"

51°

2002

Cas

00^h26^m12.04^s / +56°46'45.20"

6^m.9

9^m.9

22.8"

4°

2018

Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Very close, in diffraction, ~1.5". B is much fainter, ~3 delta mag, a pin prick resolved with seeing.
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Interesting multiple system. Faint pairs on either side of a widely separated main pair, all in parallel PAs. (Quintuple. I saw AB through AE. C has a D pair which was not seen.)
René Merting Drachhausen (Germany)	320mm (72x)	AB: bei 72x wirkt Komponente A gelblich - auf B habe ich leider nicht geachtet AC: bei 144x ist Komponente C ordentlich entfernt im Norden von A erkennbar - C ist mindestens 2.5 Magnituden schwächer - auch bei 72x sind beide Komponenten mit ordentlich Abstand voneinander erkennbar

STF30

7^m.0

8^m.9

13.2"

316°

2018

Cas

00^h27^m12.45^s / +49°59'08.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Obvious wide bright pair.

STT10

6^m.5

10^m.2

114.2"

240°

2015

Psc

00^h27^m31.02^s / +16°01'31.70"

6^m.5

9^m.5

274.3"

156°

2015

10^m.2

14^m.3

152.8"

156°

2015

Mark McCarthy Fremont (California/USA)	317mm (553x)	AC: White A with ~3 delta magnitude B, very wide separation.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: B a very wide separation to W, 4 delta mag

HJ322, 12 Cet

5^m.9

10^m.2

12.0"

202°

2015

Cet

00^h30^m02.35^s / -03°57'26.30"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Orange in finder. Bright orange A in scope, with very faint blue B, ~10" to south. Nice!

★

BU1095, 28 And

5^m.2

13^m.1

2.0"

16°

2008

And

00^h30^m07.34^s / +29°45'06.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very bright yellow- white A. B is a very faint but consistent point resolved just beyond the first diffraction ring when seeing stills.

BU1094

6^m.1

8^m.4

0.3"

290°

2009

Cas

00^h30^m19.91^s / +59°58'39.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

No deformation noticed

STT11

7^m.6

7^m.7

197.6"

317°

2014

And

00^h30^m39.88^s / +32°08'11.40"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Wide, near equal finder split. WDS says physical, but they are not: the parallax ranges do not overlap -15%, 29,447 AU weighted separation, 2.14/2.08 stellar mass

★

BU394

8^m.5

8^m.8

0.8"

278°

2017

Cas

00^h30^m45.56^s / +47°31'47.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very fine, pop split with seeing, near equal.

STF33

8^m.8

8^m.9

2.8"

212°

2020

And

00^h30^m58.47^s / +34°05'53.90"

Robert Zebahl

Leipzig (Germany)

70mm (128x)

Components equally bright, easy to split.

HJ1981

A-BC

6^m.9

8^m.4

78.4"

89°

2015

Cet

00^h30^m59.89^s / -10°05'04.90"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

White pair, PA to east, ~2 delta mag.

HJ5451

6^m.0

9^m.3

55.3"

86°

2012

And

00^h31^m25.64^s / +33°34'53.90"

Uwe Pilz Leipzig (Germany)	105mm (88x)	gelbweiß, schon bei 21x erkennbar
Mark McCarthy Fremont (California/USA)	152mm (175x)	Orange star, wide 1 delta mag B. Spectral class K1III (yellow-orange). WDS says physical, however their parallax ranges do not overlap, -13%

STT12, lam Cas

5^m.3

5^m.6

0.2"

210°

2010

Cas

00^h31^m46.32^s / +54°31'20.30"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Lambda Cas: Maybe out of round? Marginal
Mark McCarthy Fremont (California/USA)	508mm (667x)	Lam Cas. Very bright, through the speckle pattern I can see elongation with subtle notch with B maybe to the west? [Correct!] Two other stars in field. Short period, 245 year period but it's whipping around A at the moment, 0.112" now, will make a quarter turn by 2037 but still be nearly the same impossible separation.

★

BU1227

7^m.2

10^m.6

2.8"

193°

2015

Cas

00^h32^m21.78^s / +58°20'19.10"

7^m.2

11^m.8

22.4"

80°

2015

7^m.2

11^m.7

30.9"

112°

2015

Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Yellow and 3 delta mag B, orange, comes into view direct vision but only with seeing, 2-3".
Mark McCarthy Fremont (California/USA)	317mm (553x)	AC: Faint star, 1 delta mag fainter than B, widely separated, PA 90 degrees from AD
Mark McCarthy Fremont (California/USA)	317mm (553x)	AD: Faint star, 1 delta mag fainter than B, more widely separated than C, at 90 degrees PA from C

STF36, 51 Psc

5^m.7

9^m.5

27.0"

84°

2018

Psc

00^h32^m23.75^s / +06°57'19.60"

5^m.7

9^m.9

174.0"

226°

2011

René Merting Drachhausen (Germany)	320mm (144x)	AB: bei 45x ein ungleicher Doppelstern mit schönem Farbkontrast - B präsentiert sich gut abgesetzt von A und wirkt graubraun gegen den weißgelb schimmernden A AC: Komponente C habe ich als solche nicht wahrgenommen, weil sie zu weit entfernt steht (174" westnordwestlich) AD (GMC10): bei 144x zeigt sich die noch schwächere Komponente D im Nordwesten von A - D ist nochmal um einiges schwächer als B
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: 51 Psc. Bright white A and 3 detla mag B, wide

VYS2, V547 Cas

10^m.6

12^m.2

3.6"

186°

2019

Cas

00^h32^m29.43^s / +67°14'08.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

V547 Cas. Faint, very fine pair, seen at 205x and had a better look at 333x. Wide, ~4" slightly reddish faint stars. SkyTools brought this up as a short period pair, however it won't make a significant change in my time. It turns out A is also a pair, MCY 1 Aa-Ab, 10.8/12.5 0.5" with a period of only 15.59 years -- discovered by one D.W. McCarthy (no relation!) in 1989 during the first results of the Steward Observatory Infrared Speckle Camera using their 2.3 meter telescope. The Ab star has a mass of only 0.18 of the sun. I think it is gettable visually with the Challenger on a good transparent night, or with the Lick Great Refractor if I ever have the good fortune to observe with it

STF39

AB-C

7^m.1

8^m.7

20.1"

45°

2018

Cet

00^h34^m29.79^s / -04°32'47.50"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Yellow and blue pair, PA to NE. Pretty.

MRI31

8^m.1

9^m.0

115.4"

9°

2015

Cas

00^h34^m35.58^s / +62°35'25.70"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Very wide pair, slightly unequal, reddish color. The B star has two close 12th magnitude companions

STF40

6^m.7

8^m.5

11.8"

313°

2018

And

00^h35^m09.63^s / +36°49'56.20"

6^m.7

12^m.8

25.4"

121°

2015

Robert Zebahl Leipzig (Germany)	102mm (62x)	AB: 2020-11-02: At 28x instantly separable, medium bright with a clear difference in brightness. Component A showed up in a bright orange, B rather colorless. At 62x very nice sight. A: bright orange, B: grey-bluish.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Pretty yellowish star with fainter, widely separated B.

H5 17, pi And, 29 And

4^m.4

7^m.1

36.2"

175°

2019

And

00^h36^m52.84^s / +33°43'09.70"

4^m.4

13^m.0

55.1"

355°

2013

Robert Zebahl Leipzig (Germany)	8x44	AB: 2020-11-25: Not separable. The faint companion was probably outshone by the bright primary component.
Robert Zebahl Leipzig (Germany)	102mm (28x)	AB: 2020-11-02: Quite large separation and large difference in brightness. A: white-yellowish, B: slightly bluish.
Uwe Pilz Leipzig (Germany)	105mm (88x)	AB: (HV 17) blauweiß und violett-grau

J220

10^m.5

3.0"

239°

2015

Cas

00^h37^m32.95^s / +60°44'33.30"

Uwe Pilz

Leipzig (Germany)

120mm (180x)

Sekundärstern war nur als milchige Aufhellung erkennbar.

../projects/double-stars/uwe-pilz/sketches/211222J220.jpg

STF45

6^m.8

10^m.1

19.1"

91°

2015

Cas

00^h38^m41.60^s / +46°57'24.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Easy wide orange and blue, 3 delta mag.

STT16

5^m.6

10^m.5

12.3"

22°

2015

Cas

00^h39^m09.89^s / +49°21'16.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

wide and faint.

HJ1986

8^m.0

8^m.5

40.3"

67°

2018

Cep

00^h39^m35.16^s / +84°44'52.00"

8^m.0

11^m.2

55.8"

189°

2015

René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x sehr weit getrenntes Pärchen - beide Komponenten ähnlich hell, Komponente A im SW weiß, B eine halbe Größenklasse schwächer und mehr gräulich - zurück auf 20x sind beide weiterhin weit getrennt erkennbar
Sarah Gebauer Germany	100mm (45x)	bei 45x und 1,8° GF in der Nähe des OS NGC 188 getrennt zu sehen, das Trio bildet ein spitzes, langes Dreieck
René Merting Drachhausen (Germany)	320mm (45x)	AB: bei 45x sehr einfach - Komponente B im NO ist maximal eine halbe Größenklasse schwächer - Komponente A weißorange AC: bei 45x zeigt sich C im Süden von A als ganz schwaches Lichtpünktchen - Abstand zu A etwas größer als der von AB - alle drei Sterne zusammen bilden ein flaches Dreieck, A ist die Spitze mit dem flachen Winkel

STF46, 55 Psc

5^m.6

8^m.5

6.6"

195°

2015

Psc

00^h39^m55.57^s / +21°26'18.60"

Robert Zebahl Leipzig (Germany)	70mm (44x)	Clearly separated, but large difference in brightness. The companion appeared only as a tiny, faint star. The primary component sparkled in light orange.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange with wide separated blue B.

STF47 & BU1348

STF47

7^m.2

8^m.8

16.6"

205°

2015

And

00^h40^m19.78^s / +24°03'14.00"

BU1348

7^m.2

11^m.1

46.5"

233°

2015

Robert Zebahl Leipzig (Germany)	102mm (28x)	STF47 (AB): 2020-11-02: Easy to separate with a clear difference in brightness. Moderately conspicuous. The primary component appeared whitish with a faint companion.
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF47 (AB): Easy, a triple. Orange A star with 1.5 delta mag. B, 10". Third star another 1 delta mag, further out in a similar PA. Third star is BU 1348
Mark McCarthy Fremont (California/USA)	317mm (553x)	BU1348 (AC): The third star out, paired with both A and B of STF 47 -- pretty weird orbit, trying to picture it

alpha Cas, 18 Cas, Shedir, Schedar

BU1349

2^m.4

14^m.0

24.8"

280°

2014

Cas

00^h40^m30.39^s / +56°32'14.70"

BU1349

2^m.4

13^m.0

30.6"

104°

2014

H5 18

2^m.4

9^m.0

70.4"

283°

2018

René Merting

Drachhausen (Germany)

320mm (45x)

AD: bei 45x strahlt Komponente A herrlich strohgelb, D steht ganz schwach weit abgesetzt westlich von A

STF48

7^m.8

8^m.1

5.4"

333°

2020

Cas

00^h42^m40.01^s / +71°21'57.30"

Robert Zebahl Leipzig (Germany)	70mm (57x)	At 22x almost split, clearly elongated, notched. At 31x split, but very close together, almost equally bright. At 57x easily separable with very small difference in brightness. The fainter companion appeared slightly orange.
Mark McCarthy Fremont (California/USA)	152mm (175x)	Near equal white, well separated. WDS uncertain, but there is 58% parallax range overlap, 1,493 AU weighted separation, 2.62/2/47 Msol, so it's probable they are gravitational

HJ1995

6^m.7

11^m.3

42.8"

128°

2017

Cet

00^h42^m50.76^s / -09°55'17.90"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Fairly faint B, wide and just above averted vision threshold. PA to east.

STF52, V355 And

7^m.9

8^m.9

1.4"

2°

2017

And

00^h44^m11.27^s / +46°14'08.20"

Robert Zebahl

Leipzig (Germany)

102mm (187x)

2020-11-02: At 171x to some extent, at 187x and 224x slightly elongated. The seeing was only mediocre.

STF55

8^m.3

8^m.9

2.2"

332°

2020

And

00^h44^m22.95^s / +33°37'05.60"

Robert Zebahl

Leipzig (Germany)

70mm (128x)

Well split with noticeable difference in brightness.

HN 122, 21 Cas

5^m.7

10^m.6

35.9"

161°

2015

Cas

00^h45^m39.08^s / +74°59'17.10"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Bright yellow-white A with faint companion

ARG2

7^m.9

9^m.8

2.3"

46°

2013

Cas

00^h45^m50.79^s / +54°58'40.80"

7^m.9

12^m.7

15.6"

64°

2018

René Merting

Drachhausen (Germany)

320mm (144x)

AB: bei 144x ist die B-Komponente ganz knapp getrennt nordöstlich von A erkennbar - B ist mehr als eine Größenklasse schwächer - die Beugungsscheibchen berühren sich fast noch - schön ist anders

STFA1

7^m.2

7^m.4

47.8"

47°

2018

And

00^h46^m24.34^s / +30°56'33.50"

Robert Zebahl Leipzig (Germany)	8x40	Large distance with visible difference in brightness. I used a tripod.
Uwe Pilz Leipzig (Germany)	105mm (26x)	zweiter Doppelstern im Bild (ohne Bezeichnung). Gelb und orange.
Mark McCarthy Fremont (California/USA)	317mm (277x)	equal magnitude orange pair, wide.

H5 82

8^m.0

8^m.3

56.8"

75°

2018

Cas

00^h47^m24.62^s / +51°05'45.90"

René Merting Drachhausen (Germany)	12x50	ein ansehnliches Sternpaar, in der unmittelbaren Umgebung gibt es keine konkurrierenden Sterne - beide Komponenten stehen dicht zusammen und sind etwa gleich hell
Robert Zebahl Leipzig (Germany)	16x70	2021-10-07: Widely separated pair with rather small difference in brightness. The primary component appears in a pale orange, the companion remained colorless. Together with STF59 in field of view.
Uwe Pilz Leipzig (Germany)	16x70
René Merting Drachhausen (Germany)	18x70	zwei annähernd gleich helle Sterne ziemlich weit auseinander stehend - B im Osten ist nur leicht schwächer
Robert Zebahl Leipzig (Germany)	70mm (26x)	Almost equally bright components with large separation.

STF59

7^m.2

8^m.1

2.3"

149°

2020

Cas

00^h47^m59.03^s / +51°26'41.20"

Robert Zebahl Leipzig (Germany)	16x70	2021-10-07: The double star appears at least elongated when observed carefully. Together with H5 82 in field of view.
Robert Zebahl Leipzig (Germany)	70mm (100x)	At 57x elongated, at 100x barely, at 128x clearly split with noticeable difference in brightness.

HO306

9^m.6

9^m.9

1.5"

159°

2016

And

00^h48^m06.71^s / +25°32'54.30"

Robert Zebahl

Leipzig (Germany)

102mm (160x)

Pretty faint and tight with visible difference in brightness.

★★★

eta Cas, 24 Cas

STF60

3^m.5

7^m.4

13.4"

326°

2019

Cas

00^h49^m06.29^s / +57°48'54.70"

STF60

3^m.5

11^m.4

225.0"

260°

2000

STF60

3^m.5

12^m.8

189.4"

354°

2011

STF60

3^m.5

10^m.2

75.6"

126°

2015

STF60

3^m.5

11^m.5

378.3"

276°

2000

STF60

3^m.5

9^m.5

419.7"

259°

2012

STF60

3^m.5

8^m.4

701.1"

355°

2012

SMR2

3^m.5

11^m.6

90.3"

73°

2012

SMR2

3^m.5

12^m.3

237.1"

262°

2012

Robert Zebahl Leipzig (Germany)	70mm (57x)	AB: Easy to split with big difference in brightness. Fainter component appeared deep orange to slightly red colored, brighter component tends to be more slightly yellowish.
René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x ist Komponente A so hell, dass B trotz des augenscheinlich großen Abstandes von 13,4" nur knapp getrennt zu sehen ist - Komponente A ist gleißend hell-gelb, B dürfte mindestens 3 Größenklassen schwächer sein und wirkt dadurch dumpfer
Uwe Pilz Leipzig (Germany)	105mm (53x)	AB: leicht
Uwe Pilz Leipzig (Germany)	105mm (288x)	kein Sternentstehungsgebiet!
Sarah Gebauer Germany	150mm (54x)	AB: bei 54x erst nur einen Stern gesehen, doch da, ganz schwach darunter doch die wesentlich schwächere, zweite Komponente entdeckt
Robert Zebahl Leipzig (Germany)	152mm (30x)	AB: 2021-09-11: Light yellow & red-brownish.
Winfried Kräling Marburg (Germany)	152mm (175x)
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Nice yellow pair. A is a red tainted yellow, B is cleaner.
René Merting Drachhausen (Germany)	320mm (72x)	AB: bei 72x ein echt fetter Farbkontrast, Komponente A ist gleißend hell und zitronengelb, B zeigt sich knallig orange - beide Sterne sind gut getrennt voneinander zu beobachten - sehenswert

STI1437

9^m.7

11^m.0

11.1"

299°

2015

Cas

00^h49^m32.95^s / +55°33'54.40"

Mark McCarthy

Fremont (California/USA)

203mm (533x)

Obvious pair, wide, ~15" or so, one delta mag [not physical]

★

65 Psc, STF61

6^m.3

4.4"

115°

2020

Psc

00^h49^m52.88^s / +27°42'38.90"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Bright orange pair, 6-7"

★

BU232

8^m.5

8^m.8

0.9"

256°

2018

Cas

00^h50^m25.10^s / +50°37'49.60"

AB-C

8^m.5

10^m.1

24.5"

300°

2018

Mark McCarthy Fremont (California/USA)	203mm (533x)	AB: Nice, well split, near equal. Part of a triple, the next one much wider in same PA and two delta mag. [AB-C is 10.06 24.5"]
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Neat near equal orange and yellow. Split with seeing, 1".
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB-C: C 2 delta mag fainter than B, about 25" separated, is the +1 star with BU232AB

★

MLR27

10^m.2

0.5"

212°

2008

Cas

00^h51^m10.71^s / +60°18'54.20"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Split with seeing, tremulous in turbulence but does split when settled. Noticeable delta mag.

BU781

8^m.4

9^m.3

1.0"

22°

2017

Cas

00^h51^m36.19^s / +68°59'14.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very fine faint pair, need to wait for seeing. 1", 1 delta mag.

A812

7^m.7

11^m.1

1.8"

327°

2017

Cas

00^h51^m47.06^s / +48°03'23.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange star, suspect a brightening in diffraction when seeing stills, marginal.

★

STF65

8^m.0

3.2"

221°

2020

Cas

00^h52^m45.61^s / +68°51'59.30"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Clearly split with equally bright components.
Mark McCarthy Fremont (California/USA)	152mm (175x)	Near equal, white, well separated. WDS uncertain, but they probably are gravitational with 73% parallax range overlap, 656 AU weighted separation, 2.22/2.24 Msol
Mark McCarthy Fremont (California/USA)	317mm (553x)	Equal pair, white-yellow. Wide and pretty bright

★★

BU1

8^m.6

9^m.3

1.5"

83°

2016

Cas

00^h52^m49.22^s / +56°37'39.50"

8^m.6

8^m.9

3.9"

134°

2020

8^m.6

9^m.7

8.9"

195°

2020

8^m.6

12^m.1

15.8"

333°

2015

8^m.9

9^m.7

7.8"

220°

2020

Robert Zebahl Leipzig (Germany)	70mm (57x)	AC: Easy to split with little difference in brightness.
Robert Zebahl Leipzig (Germany)	70mm (57x)	AD: Relatively large angular distance with obviously fainter component.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: In the finder there is a right triangle of equal stars, the foot star has a very faint, 2-3 delta mag star very close ~1", faint split. Some fainter stars wreathed about it. AC and AD appear to be the other triangle stars. 17 stars visible in the system, which I suppose ought to be called an open cluster

STI1460

9^m.2

12^m.9

9.6"

92°

2015

Cas

00^h52^m55.81^s / +55°20'16.90"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

B is a faint star, pretty wide, unremarkable [not physical]

BU497

4^m.8

9^m.8

146.0"

170°

2015

Cas

00^h53^m04.28^s / +61°07'24.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Super wide and faint.

STF70

6^m.3

9^m.5

8.1"

247°

2015

Cas

00^h53^m47.53^s / +52°41'21.60"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Yellow-white A and widely separated B, a small point, 3 delta mag

HU1018

9^m.9

10^m.3

0.9"

58°

2015

Cas

00^h54^m14.98^s / +51°08'12.00"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Excellent pair, near equal, ~1", very fine

★

A1258

9^m.7

9^m.9

0.6"

202°

2018

Cas

00^h54^m23.37^s / +54°31'41.00"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Yes! I got it split, what a sight! Suspected at 533x. Reddish A, 1 delta mag brighter than blue B. Perfect star images. Nice color pair

STF72

8^m.4

9^m.3

23.3"

173°

2015

And

00^h54^m37.50^s / +39°10'09.70"

Robert Zebahl Leipzig (Germany)	152mm (22x)	Easy with moderate difference in brightness. Both components appeared orange, the fainter one slightly more intense. The color was well visible at 69x.
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x ein schönes Farbpaar - ordentlich getrennt, die schwächere Komponente im Süden ist etwas mehr als eine halbe Größenklasse schwächer - bei 144x wirkt A deutlich gelblich, B ist weiß-blau

★

HU802

7^m.8

10^m.0

0.4"

222°

2008

Cas

00^h54^m53.84^s / +49°24'18.90"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Hairline split to overlapping, 1 delta mag, super fine

★★

STF73, 36 And

6^m.1

6^m.5

1.2"

338°

2019

And

00^h54^m58.02^s / +23°37'42.40"

Sarah Gebauer Germany	100mm (136x)	beide Sterne tanzen wild umeinander herum, blickweise ist er kurz getrennt
Robert Zebahl Leipzig (Germany)	102mm (125x)	Clearly visible as figure '8' with a rather small difference in brightness.
Uwe Pilz Leipzig (Germany)	105mm (198x)	ganz einfach
Uwe Pilz Leipzig (Germany)	105mm (240x)	gelb und weiß
Mark McCarthy Fremont (California/USA)	152mm (175x)	Superfine near equal yellow-orange stars, nice! Binary with 167.5-year period. It is nearly at apastron and will widen very slightly by 2040
Robert Zebahl Leipzig (Germany)	152mm (300x)	Split with little gap in between and little difference in brightness. Seeing was not really good.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	hell

BU1098, ups 1 Cas

5^m.0

12^m.5

18.0"

63°

2015

Cas

00^h55^m00.19^s / +58°58'22.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Bright yellow and very much fainter 4 delta mag B

★

TDS1665

10^m.5

0.5"

30°

2015

Cas

00^h55^m08.24^s / +57°13'30.80"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Can tell is double, elongated, and I got one split in ten seconds, seeing needs to be perfect

TDS1667

10^m.6

0.6"

296°

2007

Cas

00^h55^m25.53^s / +59°50'59.90"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Pretty well split once it resolves out of the haze into two near equal points

ES405

10^m.2

10^m.4

4.4"

117°

2016

Cas

00^h55^m41.89^s / +57°47'06.10"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Pretty, near equal white stars, wide separation

★

TDS1670

11^m.6

0.7"

26°

2015

Cas

00^h55^m57.82^s / +58°32'38.90"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Rather wide, well split with seeing, bluish stars due to faintness. Very nice pair

HJ1057, mu And

3^m.9

12^m.9

51.8"

295°

2012

And

00^h56^m45.10^s / +38°29'57.30"

3^m.9

11^m.4

28.5"

151°

2012

3^m.9

11^m.0

260.0"

39°

2012

René Merting

Drachhausen (Germany)

320mm (72x)

AB: bei 72x ist B im NW gut abgesetzt erkennbar, B ist nicht mehr als ein Schatten, der sich gerade so aus dem Glühen von A befreien kann
AC: C ist wohl noch zu dicht an A, der Halo zu kräftig - bis 320x probiert, C leider nicht gesehen

BU1099

6^m.1

6^m.5

0.2"

9°

2010

Cas

00^h56^m46.94^s / +60°21'46.30"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Obvious elongation but no notching, PA seems NNE, in a lot of diffraction. 83.1-year period, currently 0.157", it will make more than a quarter turn and widen to 0.2" by 2038. Burnham discovered in 1889 with the Lick 36-inch at 0.2" and says it's a "close and difficult" pair

TDS34

10^m.9

1.0"

43°

2017

Cas

00^h56^m47.40^s / +57°12'09.20"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Very fine split, slightly unqueal, seen at 205x but more steady view with 333x

ES940

7^m.3

10^m.1

61.7"

359°

2015

Cas

00^h57^m20.19^s / +52°14'23.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange A with very faint pin prick B, with seeing, 3 delta mag, wide.

A1512

8^m.7

13^m.7

6.8"

328°

2015

And

00^h57^m33.41^s / +37°03'46.30"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

B just comes into view with passing vision as I scan scanning about the field, not averted vision but more just moving my eye about. I can hold it direct, very faint in A's bright light orange glow. Very nice

HLD4

9^m.0

9^m.5

0.3"

38°

2007

Cas

00^h57^m35.79^s / +54°23'44.80"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Yellowish stars, nicely split, a near equal. [this pair is widening, will get a little easier, was 1" at discovery in 1881 -- Holden, Lick director.]

Winnecke 1, WNC1

10^m.1

10^m.4

5.3"

132°

2019

Psc

00^h58^m00.81^s / +09°16'43.10"

René Merting

Drachhausen (Germany)

320mm (72x)

bei 45x ist der Doppelstern al 8 erkennbar - bei 72x ein schönes, enges Doppelsternpärchen - beide Komponenten sind annähernd gleich hell, aber leicht unterschiedlich farbig - bei 144x habe ich versucht, den Farbunterschied fest zu machen, aber hier stellte sich mal wieder der Effekt ein, dass die Farben je nach Sicht hin und her sprangen

S390

7^m.8

7^m.9

6.5"

216°

2018

Cet

00^h58^m09.75^s / -15°40'58.00"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x eine schöne Erdnuss, sprich zwei gleichhelle Sterne, die nur in guten Momenten knapp getrennt erscheinen - die Trennung ist dann eindeutiger bei 64x

A925

7^m.8

10^m.4

1.0"

109°

2016

And

00^h58^m41.44^s / +44°57'22.50"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Attempted, but I could not see the B star, even when seeing is very good and A is a nice light orange round disk. Should have been gettable at 1"

COU1505

9^m.3

9^m.4

0.2"

138°

1996

And

00^h59^m24.14^s / +40°56'31.90"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Elongation at 667x, a squat little snowman at 1067x. White, slight mag difference

COU1655

11^m.1

12^m.2

1.3"

4°

2015

And

00^h59^m54.89^s / +42°56'48.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Very faint pair, nice and clean split with seeing, well separated with 333x, suspected at 205x, significant mag difference

STF79, 164 And

6^m.0

6^m.8

7.9"

195°

2018

And

01^h00^m03.56^s / +44°42'47.70"

Robert Zebahl Leipzig (Germany)	55mm (25x)	Beautiful double star, relatively tight with visible difference in brightness.
René Merting Drachhausen (Germany)	320mm (45x)	ein wunderschöner Doppelstern für 45x - im Umfeld fallen zwei relativ helle Sterne sehr dicht stehend auf - B ist eine halbe Magnitude schwächer und strahlt zwar auch weiß wie A, aber etwas schmutziger
Mark McCarthy Fremont (California/USA)	508mm (205x)	164 And. Dual white headlights, slight mag difference. Physical

COU2255

11^m.0

11^m.6

0.8"

13°

1995

And

01^h00^m15.51^s / +48°01'57.80"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Split clean with just 205x, very tight pair, noticeable magnitude difference, near to bright star

★

MAD1

7^m.7

9^m.1

0.8"

1°

2015

And

01^h00^m35.58^s / +47°19'14.60"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Exceptionally fine split with 333x, obvious with 533x, getting really nice airy disks. ~2 delta mag, <1", pale yellow A and very light green B. Physical pair with a 925 year period.

COU2256

10^m.3

10^m.5

0.6"

127°

2016

And

01^h01^m02.12^s / +48°29'34.30"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Clean split with seeing, ~1 delta mag, A is white B is dull

★

ES45

6^m.6

10^m.8

7.9"

244°

2015

Cas

01^h01^m27.04^s / +49°32'39.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange-yellow A, need averted vision to flash B out, barely hold with direct vision.

★

A2901

7^m.1

7^m.8

0.4"

64°

2018

Cas

01^h01^m30.15^s / +69°21'30.70"

Mark McCarthy Fremont (California/USA)	152mm (285x)	Seems a very subtle out of round, but not certain. Physical with a 1517-year orbit, will not significantly widen in my lifetime. Discovered at 0.2", 0.4" now. No Gaia data
Mark McCarthy Fremont (California/USA)	317mm (885x)	Elongated to notched with seeing

ES1492

9^m.8

12^m.2

3.0"

73°

2007

And

01^h01^m38.99^s / +43°57'24.90"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Nice delicate pair, ~2 delta mag, well separated

HJ2010

8^m.3

9^m.7

9.9"

271°

2016

And

01^h02^m47.00^s / +47°41'55.40"

Robert Zebahl

Leipzig (Germany)

102mm (28x)

2020-11-02: Clearly separated, significant difference in brightness, still relatively close together. The components appeared slightly different in color: slightly yellowish & slightly bluish.

STT21

6^m.8

8^m.1

1.3"

175°

2018

And

01^h03^m01.54^s / +47°22'34.10"

Robert Zebahl Leipzig (Germany)	102mm (160x)	2020-11-02: The double star appears clearly elongated, but with no visible notch.
Uwe Pilz Leipzig (Germany)	120mm (180x)	weiß
Mark McCarthy Fremont (California/USA)	508mm (333x)	Nice pale yellow bright stars, ~2 delta mag, needed 333x clearly resolve, ~1". Physical pair with 450 year period

★

BU396

6^m.1

8^m.6

1.3"

67°

2007

Cas

01^h03^m37.01^s / +61°04'29.40"

Mark McCarthy Fremont (California/USA)	152mm (285x)	Subtly notched snowman, unequal. Burnham discovered with the 6-inch at 1.2", obviously on a better night. WDS uncertain, no Gaia data on the secondary
Mark McCarthy Fremont (California/USA)	317mm (553x)	Suspected in 277x, confirmed split with 553x, Small much fainter blue B in A's diffraction -- yellow-white, ~1", ~3 delta mag.

STF84, 26 Cet

6^m.1

9^m.5

16.0"

253°

2015

Cet

01^h03^m49.02^s / +01°22'00.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Pale yellow and almost dark purple B, 2 delta mag, ~15"

A1810

9^m.7

10^m.6

3.1"

182°

2011

And

01^h05^m11.36^s / +43°54'00.60"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Attractive pair, ~3" and >1 delta mag

★★

STF88, psi 1 Psc, 74 Psc

5^m.3

5^m.5

29.8"

159°

2018

Psc

01^h05^m40.93^s / +21°28'23.60"

5^m.3

10^m.7

90.4"

124°

2017

5^m.5

10^m.7

68.5"

109°

2017

Christopher Hay Seeheim (Germany)	7x45	AB: Very tight but definitely split, binoculars handheld. Component A is very slightly brighter than B.
Robert Zebahl Leipzig (Germany)	8x44	AB: 2020-11-25: Beautiful! Very nicely separated with little difference in brightness. White-yellowish & white-bluish. Separable even without using a tripod, but difficult.
René Merting Drachhausen (Germany)	10x50	AB: ein etwas mehr als knapp getrenntes Pärchen zweier gleichheller Sterne
Christopher Hay Seeheim (Germany)	15x45	AB: Well split, binoculars with internal stabilisation. Component A appears at first to be more orange than component B, but after about ten seconds the orange impression flips to component B, and from there on goes back and forth. Visited Psi1 Psc several times, taking breaks of a few minutes in-between, and each time the same effect occurred, with A initially appearing to be on the orange side.
René Merting Drachhausen (Germany)	16x70	AB: ein ordentlich getrenntes helles Sternpaar, die südliche B-Komponente wirkt etwas weniger weiß - schöner Anblick
Christopher Hay Seeheim (Germany)	18x80	AB: Psi1 Psc is well separated. Very strong visual presence in this instrument. Components almost identically bright, colourless. Strongly supplemented to the south in 4° field of view by Psi2, Psi3 and Chi. Field relatively empty to the north, which gives the field further tension. According to Stelledoppie a true physical double 275 light years distant.
Mark McCarthy Fremont (California/USA)	152mm (175x)	AB: Spot-on equal white stars, wide. WDS says physical, and they likely are binary: 29% parallax range overlap, 2,704 AU weighted separation and 2.76/2.52 Msol

STF90, 77 Psc

6^m.4

7^m.3

32.7"

84°

2018

Psc

01^h05^m49.22^s / +04°54'31.20"

6^m.4

13^m.2

157.6"

290°

2015

6^m.4

14^m.6

42.0"

323°

2015

6^m.4

14^m.4

90.4"

352°

2015

Robert Zebahl Leipzig (Germany)	8x44	AB: 2020-11-25: On this evening nicely visible together with Mars in one field of view. The double star forms a nice triangle with two other stars. It is clearly separable with a fainter companion. A appeared rather cool in color, the companion somewhat warmer. Very nice sight.
Christopher Hay Seeheim (Germany)	15x45	AB: Widely split. Very reminiscent in PA and delta-Mag of the pair Zeta Psc (STF100) 3° to the north, but is wider, weaker and thus overall more pleasant in this instrument.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Very easy white-yellow pair, ~0.5 delta mag, wide PA to the east.

S393, sig 2 Psc

6^m.4

10^m.6

60.0"

295°

2014

Psc

01^h06^m11.20^s / +32°10'53.30"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Light orange and very wide, faint B. WDS says not physical, and they're correct, -94% parallax range overlap

STT22

7^m.3

10^m.5

8.3"

201°

2015

Psc

01^h07^m03.98^s / +11°33'07.50"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

White A and very faint wide B. B is on edge of detectability. WDS uncertain, but they likely are binary: 74% parallax range overlap, 754 AU weighted separation, 1.75/0.83 Msol

STTA11

AB-C

7^m.6

8^m.8

59.3"

164°

2014

And

01^h07^m09.16^s / +38°39'01.70"

Robert Zebahl Leipzig (Germany)	152mm (22x)	Pretty wide pair with moderate difference in brightness. At 69x the primary component appeared slightly orange, BC rather greyish.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein Brecher - das Sternpaar präsentiert sich sehr komfortabel getrennt - AB im Norden ist weißgelb, C scheint eine halbe Größenklasse schwächer zu sein (1.15 mag laut Stelle Doppie) und wirkt dennoch schon sehr grau im Farbvergleich gegen AB

STF91

7^m.4

8^m.6

4.3"

315°

2018

Cet

01^h07^m10.99^s / -01°43'55.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange-yellow pair, ~2 delta mag, ~4", PA to N.

COU1658

10^m.7

10^m.8

0.9"

33°

2008

And

01^h07^m39.12^s / +44°47'07.30"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Very tight near equal pair, split even with 205x, near some brighter stars

BU397

7^m.5

10^m.2

8.7"

142°

2015

And

01^h07^m49.57^s / +46°50'31.60"

Uwe Pilz Leipzig (Germany)	120mm (128x)	schwierig
Mark McCarthy Fremont (California/USA)	508mm (205x)	AB is an easy pale gold A and blue B. AC more difficult since C is much fainter, seen only with averted vision at twice the separation as B, and about forty degrees wider PA

ES1360

10^m.8

11^m.1

2.8"

262°

2015

And

01^h08^m11.44^s / +45°20'40.70"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Faint pair, significant delta mag. pretty close

MLR653

10^m.4

10^m.5

0.5"

232°

2008

Cas

01^h08^m32.19^s / +55°54'06.40"

Mark McCarthy

Fremont (California/USA)

508mm (677x)

Split very fine, more than hairline, significant delta mag. Seeing allows two white points. Nice

★

AC13

8^m.1

9^m.5

0.6"

265°

2018

And

01^h08^m53.15^s / +45°12'26.90"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

! AB is paired with a widely separated 11th magnitude C star forming HJ 2018. A splits beautifully at 533x, ~0.5", nearly 2 delta mag.

A932

9^m.5

10^m.6

0.9"

333°

2015

And

01^h09^m23.31^s / +44°53'41.20"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Nice wide clean split at 533x, ~1", significant delta mag

STT515, phi And, 42 And

4^m.6

5^m.6

0.6"

115°

2016

And

01^h09^m30.12^s / +47°14'30.60"

Robert Zebahl Leipzig (Germany)	102mm (280x)	2020-11-04: Seeing 3-4/5; In no way separable or detectable as a double star.
Uwe Pilz Leipzig (Germany)	120mm (180x)
Robert Zebahl Leipzig (Germany)	152mm (300x)	2020-11-06: Seeing 3/5; Not detectable as a double star.
Mark McCarthy Fremont (California/USA)	508mm (677x)	Phi And. I get elongation in the speckle matter, but no better resolution. Bright 0.52" pair

BU303

7^m.3

7^m.6

0.5"

295°

2018

Psc

01^h09^m39.15^s / +23°47'39.30"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Notched elongation all powers. Burnham discovered with the 6-inch at 0.6" so it was a little easier! WDS uncertain, lacking Gaia data

BAR1, bet And

2^m.2

13^m.0

108.4"

276°

2015

And

01^h09^m43.92^s / +35°37'14.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

EE Barnard recorded eight faint stars, ranging from 10.7 to 14.4 mangnitude, surrounding Beta Andromadae. As a bonus, galaxy NGC 404 "Mirach's Ghost" is in the same near area. I found seven using magnifications of 201x to 553x, moving Beta in and out of the field.

BU868

8^m.0

10^m.5

9.2"

233°

2015

Cas

01^h10^m00.67^s / +52°01'59.80"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

AB is easy at 205x, wide light orange A and blue B. Burnham discovered with the 18.5-inch at Washburn and did not notice anything amiss with the A star during subsequent measures with the Lick 36-inch. EGG 1 Aa-Ab is 0.048", O.J. Eggen discovered Aa-Ab in 1984 with the Kitt Peak 4m telescope

STT23

8^m.1

8^m.6

14.5"

191°

2015

Cas

01^h10^m07.56^s / +51°44'48.20"

8^m.1

12^m.4

57.5"

93°

2015

Robert Zebahl Leipzig (Germany)	16x70	AB: 2021-10-07: The double star is located southwest of a conspicuous parallelogram consisting of medium bright stars. A well worth looking double star with a small difference in brightness and attractive separation. I could not see any color.
René Merting Drachhausen (Germany)	320mm (72x)	AB: bei 72x sehr auffällig - zwei eng zusammen stehende gleich helle Sterne in nordsüdlicher Ausrichtung - im Umfeld stehen weitere gleich helle Sterne, die stehen aber nicht so schön zusammen wie die beiden Protagonisten von STT23
Mark McCarthy Fremont (California/USA)	508mm (205x)	AB: Pair of clean white stars, widely separated, near equal. Physical

MLR627

10^m.2

10^m.4

0.2"

173°

2008

Cas

01^h10^m15.63^s / +57°10'03.60"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Very brief notched elongation of nearly equal white stars, but very brief.<0.3", which was given in SkyTools, given the difficulty. [Current precise separation is 0.18".]

★

BU235

Aa-Ab

7^m.5

7^m.8

0.8"

143°

2018

Cas

01^h10^m34.31^s / +51°00'47.80"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	Mehrfachsystem
Mark McCarthy Fremont (California/USA)	508mm (333x)	Amazing system with five faint pairings, but the main attraction is Aa-Ab, near equal bright A, hairline at 205x and and a nice clean split at 333x, light yellow stars, slight magnitude difference. Seeing giving me nice round disks. Terrific. Physical pair with a 278 year period. Amazingly, Burnham discovered this with his 6-inch

HJ634

7^m.3

12^m.7

56.3"

236°

2015

Psc

01^h10^m54.28^s / +09°33'50.00"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Yellow-orange with faint wide B to west, ~3 delta magnitude.

STT553, the Cas

4^m.3

11^m.3

126.4"

143°

2012

Cas

01^h11^m06.16^s / +55°08'59.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Super wide and faint.

HO215, 45 And

6^m.6

0.1"

225°

2006

And

01^h11^m10.29^s / +37°43'26.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

45 And: Disk seems not round but far for me to claim it, marginal observation

BU398

9^m.3

9^m.4

1.8"

44°

2018

And

01^h11^m52.40^s / +47°47'54.40"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Fine near equal white stars. Burnham discovered with the 6-inch at 1.85"

★

STF96

7^m.9

8^m.9

0.9"

287°

2018

Cas

01^h12^m41.24^s / +65°00'32.90"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	scheint enger als 0,9"
Mark McCarthy Fremont (California/USA)	317mm (553x)	Mostly notched but moments of hairline split with seeing 1.5 delta mag. Very tough! Yellow-orange stars.

STF98

7^m.0

8^m.1

20.0"

250°

2018

Psc

01^h12^m52.98^s / +32°04'31.70"

Robert Zebahl Leipzig (Germany)	70mm (22x)	Easy to separate at 22x, clear difference in brightness at moderate distance. In terms of color, the two components appeared slightly different. At 44x A appeared white-yellowish, B slightly reddish.
Uwe Pilz Leipzig (Germany)	105mm (288x)	nicht einfach
Mark McCarthy Fremont (California/USA)	152mm (175x)	Light yellow A and blue B, wide, 1 delta mag. WDS uncertain, but they do not share parallax ranges -78%
Mark McCarthy Fremont (California/USA)	317mm (277x)	Yellow-orange and 1 delta mag B. Could be a multiple system: some stars on other side of A making a triangle, 2-3 times fainter. (4 stars in system).

STT26

6^m.3

10^m.5

10.7"

258°

2015

Psc

01^h12^m59.47^s / +30°03'51.20"

Mark McCarthy Fremont (California/USA)	152mm (175x)	Light orange A and 4 delta mag B, wide. WDS claims physical, but there is -4% parallax range overlap, so they are likely not binary
Mark McCarthy Fremont (California/USA)	317mm (277x)	Orange with much fainter B ~10" to south.

★

BU258

6^m.5

8^m.8

1.6"

263°

2015

Cas

01^h13^m09.82^s / +61°42'22.30"

Mark McCarthy Fremont (California/USA)	152mm (175x)	Very fine, 2 delta mag, just split. WDS uncertain, Burnham discovered with his 6-inch at 0.8"! Sadly there is no parallax range overlap (-72%)
Mark McCarthy Fremont (California/USA)	317mm (553x)	Barely split at 340x, a brightening in the first diffraction. Wanted more certainty so went to 553x, clean split, 2" 3 detla mag.

★★

zeta Psc, 86 Psc, STF100

5^m.2

6^m.3

22.8"

63°

2018

Psc

01^h13^m43.80^s / +07°34'31.80"

Christopher Hay Seeheim (Germany)	7x50	On tripod. Fine split with a sliver of black between the components. No particular colour.
Christopher Hay Seeheim (Germany)	15x45	Cleanly split. Western component distinctly brighter, no colour impression.
Christopher Hay Seeheim (Germany)	180mm (110x)	Despite the wide separation the pair holds together visually very strongly, and dominates the FOV. And indeed, Stelledoppie states it is a true physical pair at 174 light years from us. Component A is ice-blue. I probably wouldn't have any strong colour impression coming across component B on its own, but standing next to A it seems a washed-out orange.
Robert Zebahl Leipzig (Germany)	200mm (37x)	Visually evident as double star and easy to find. Well split with slight difference in brightness.

STF99, phi Psc

4^m.7

9^m.1

7.6"

226°

2015

Psc

01^h13^m44.94^s / +24°35'01.60"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Light orange A and very faint, 4 delta mag B. WDS uncertain, but they are likely binary: 45% parallax range overlap, 922 AU weighted separation, 3.89/1.13 Msol

HJ636

7^m.4

11^m.8

20.4"

288°

2015

Psc

01^h14^m20.83^s / +30°32'31.60"

Mark McCarthy Fremont (California/USA)	152mm (175x)	Very faint wide B needs foveal coaxing and then can hold direct. WDS claims physical, however they don't share parallax ranges (-15%) and there's a quite far 4,521 AU weighted separation 2.62/1.13 Msol, so they likely are not binary
Mark McCarthy Fremont (California/USA)	317mm (553x)	Very faint B ~20" out but not difficult. ~4 delta mag.

STFA3, 37 Cet

5^m.2

7^m.8

47.1"

331°

2018

Cet

01^h14^m24.04^s / -07°55'22.20"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein weit auseinander stehender Doppelstern mit einem schönen Farbkontrast, Komponente A im SO ist weisgelblich, die gut 2 Magnituden schwächere Komponente B ist eher schmutzig grauorange
Mark McCarthy Fremont (California/USA)	317mm (553x)	37 Cet: Both orange, B 3 delta mag, so more intense orange. Wide separation PA to the north.

STF104

8^m.0

9^m.8

13.4"

323°

2015

And

01^h16^m57.09^s / +38°27'38.70"

Robert Zebahl Leipzig (Germany)	152mm (69x)	Easy, rather close pair, but with a clear difference in brightness. Primary component appeared slightly orange, companion slightly grey-bluish.
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x ein schönes, enges Paar - Komponente B im NW ist sehr schwach - A ist leicht gelblich, B mal wieder ohne Farbe

STF102

7^m.3

9^m.2

0.5"

271°

2016

And

01^h17^m47.96^s / +49°00'30.50"

AB-C

7^m.2

8^m.8

10.0"

223°

2015

AB-D

7^m.2

10^m.8

23.6"

58°

2015

8^m.8

10^m.8

33.5"

54°

2015

10^m.8

10^m.2

98.5"

356°

2015

Robert Zebahl Leipzig (Germany)	102mm (62x)	AB-C: 2020-11-02: At 28x clearly separated, fairly close together with a clear difference in brightness. The close pair AB appeared whitish with faint companion C. At 62x AB appeared white-yellowish, C grey-blue.
Uwe Pilz Leipzig (Germany)	120mm (128x)	AB-D

STF108

6^m.5

9^m.6

6.4"

62°

2017

And

01^h18^m47.00^s / +37°23'10.60"

Robert Zebahl Leipzig (Germany)	120mm (75x)	Easily split with big difference in brightness.
Robert Zebahl Leipzig (Germany)	152mm (69x)	Easy and pretty uneven. Primary component appeared slightly yellowish.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x offenbart B ganz knapp getrennt im Osten von A - B ist mindestens 2.5 Größenklassen schwächer und strahlt trotz des großen Helligkeitsunterschiedes noch in einem schönen weißgrau

STF105

8^m.8

9^m.8

3.0"

185°

2016

Cas

01^h18^m57.50^s / +66°09'28.00"

Robert Zebahl

Leipzig (Germany)

70mm (100x)

Clearly split with visible difference in brightness.

STT28 & STTA14 & BU1359

STT28

7^m.5

8^m.8

0.9"

296°

2006

Cep

01^h19^m07.19^s / +80°51'42.60"

STTA14

AB-C

7^m.6

6^m.7

127.6"

24°

2003

BU1359

6^m.7

11^m.6

70.2"

154°

2015

Christopher Hay Seeheim (Germany)	7x45	STTA14 (AB-C): Handheld. AB-C well separated.
Christopher Hay Seeheim (Germany)	10x42	STTA14 (AB-C): AB-C: Sweeping the field on the lookout for S405, STTA14 ist immediately striking as double, AB wide apart from C.
Christopher Hay Seeheim (Germany)	15x60	STTA14 (AB-C): AB-C: Wide pair, strong presence in 3.3° FOV. Northern component (C) clearly brighter. Attractive triangle of stars 1.5° to the south.
Christopher Hay Seeheim (Germany)	180mm (200x)	STT28 (AB): AB: Component B flashes out in good moments. PA estimated at 295° without prior knowledge. A physical double at a distance to us of 510 light years. Observed 1 March 2021, current separation 0.846" according to Stelledoppie.

KR11

9^m.6

9^m.7

2.0"

59°

2017

Cas

01^h19^m40.95^s / +61°34'44.40"

Robert Zebahl

Leipzig (Germany)

152mm (129x)

Rather faint double star. Easily split with equally bright components.

phi Cas, 34 Cas, H 3 23

5^m.1

12^m.3

48.4"

209°

2015

Cas

01^h20^m04.91^s / +58°13'53.80"

5^m.1

7^m.0

132.8"

235°

2014

5^m.1

10^m.3

179.0"

288°

2015

5^m.1

10^m.4

170.4"

239°

2015

Uwe Pilz

Leipzig (Germany)

105mm (288x)

AB: kein Dreifachstern erkennbar, obwohl so ausgewiesen

★

S397, 35 Cas

6^m.3

8^m.6

57.4"

342°

2018

Cas

01^h21^m05.27^s / +64°39'29.30"

René Merting Drachhausen (Germany)	16x70	ein weit getrenntes Pärchen mit einem schönen Farbkontrast - Komponente A im Süden wirkt blau-weiß, B ist gut 1.5 Größenklassen schwächer und wirkt gräulich
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein schönes helles Sternpaar, weit getrennt - auffälliger Farbkontrast, A ist reinweiß, B eher schmutzig orange-braun - zurück auf 20x ist die Trennung noch immer sehr deutlich

BU4

7^m.1

8^m.9

0.6"

114°

2018

Psc

01^h21^m19.23^s / +11°32'12.30"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Very subtle out of roundness. There is another very faint wide B (AC, 7.12/13.60 29.3"). Discovered at 0.5" with his 6-inch, so Burnham must have had a great night. WDS says physical, but not Gaia data on the primary

★

STF115

7^m.1

7^m.3

0.5"

160°

2018

Cas

01^h23^m21.27^s / +58°08'35.60"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Peanut, near equal. in nearly the same FOV with Detla Cas, V 465 pretty orange star, and NGC 457, a loose moderately rich open cluster
Mark McCarthy Fremont (California/USA)	508mm (533x)	Wonderful split, more than hairline, white stars, near equal. Nice airy disks. Physical with 222 year period, Struve discovered at 0.7" approaching apastron

STF114

7^m.2

9^m.7

3.7"

356°

2015

Cas

01^h24^m08.14^s / +72°50'49.60"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Light orange A and very light orange B, 2 delta mag. WDS uncertain, but there is -42% parallax range overlap, so it cannot be

ES1712

7^m.9

9^m.3

47.2"

2°

2015

Cas

01^h24^m20.10^s / +58°56'47.20"

9^m.3

13^m.9

5.4"

298°

2015

René Merting Drachhausen (Germany)	16x70	AB: ein gut isolierter Doppelstern, da kaum weitere Sterne im unmittelbaren Umfeld zu erkennen sind - Komponente B ist schwach und steht weit getrennt im Norden von A - leicht, aber nicht sehr reizvoll für Ferngläser
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 32x ein weit getrenntes Pärchen, aber der schöne Farbkontrast entschädigt - Komponente A im Süden ist weiß und doppelt so hell wie Komponente B, die leicht bräunlich erscheint - zurück auf 20x ist der Doppelstern noch immer weit getrennt und einfach sichtbar

★

STTA17 & BKO10

STTA17

8^m.0

9^m.8

35.4"

101°

2015

And

01^h24^m30.85^s / +39°01'30.30"

STTA17

8^m.0

8^m.5

134.9"

347°

2014

STTA17

8^m.5

9^m.8

68.9"

279°

2015

STTA17

8^m.5

13^m.3

81.2"

14°

2015

BKO10

8^m.0

11^m.2

141.7"

270°

2015

Christopher Hay Seeheim (Germany)	18x80	The group of stars strikes the eye while sweeping from Mirach to Tau/Upsilon TRI. First thought I'd found an open cluster. Two pairs with practically opposite PAs. Southern pair AB much closer than northern CD, but brightnesses within the pairs very similar. A nice double-double.
Robert Zebahl Leipzig (Germany)	152mm (22x)	The components A-D and F easily visible as a rather conspicuous group with comparatively large distances. I didn't pay attention to the component E. No brighter stars in the immediate vicinity. The pair AB and CD are very similar; CD a bit wider with opposite position angle. Very nice multiple star also for smaller telescopes.
René Merting Drachhausen (Germany)	320mm (72x)	AB: bei 72x weit getrennt - A im Westen wirkt gelblich, B ist gut 1.5 Größenklassen schwächer und erscheint grau CD: bei 72x sind diese beiden Compañeros ebenfalls mit etwas mehr Abstand im Norden erkennbar, sie stehen beide etwas weiter auseinander als AB - das Gesamtbild wirkt wie ein verzogenes, längliches Parallelogramm

ES2583

8^m.4

9^m.3

25.9"

345°

2015

Cas

01^h24^m33.04^s / +53°11'10.20"

Robert Zebahl Leipzig (Germany)	16x70	2021-10-07: Easy to split at moderate separation and well visible difference in brightness. The primary component appears yellowish, the companion grey-bluish.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein mehr als ordentlich getrenntes Farbkontrastpaar - A im Süden ist eine halbe Größenklasse heller und leicht gelblich, wohingegen B ins grauorangene tendiert

STT30

8^m.1

11^m.8

4.4"

245°

2015

Psc

01^h25^m34.17^s / +31°33'01.90"

8^m.1

56.7"

106°

2018

8^m.1

14^m.3

21.4"

204°

2015

Robert Zebahl

Leipzig (Germany)

16x70

AC: 2020-11-07: Very nicely separated, medium bright, moderate separation, small difference in brightness. Slightly orange & light blue.

psi Cas, 36 Cas

BU1101

4^m.7

14^m.0

2.4"

38°

1970

Cas

01^h25^m55.90^s / +68°07'47.80"

H5 83

4^m.7

9^m.2

20.3"

128°

2007

BU1101

4^m.7

10^m.0

19.1"

131°

2006

STF117

9^m.2

10^m.0

2.9"

253°

2018

René Merting

Drachhausen (Germany)

100mm (20x)

AC: bei 32x zeigt sich A wunderschön buttergelb, C mit ordentlich Abstand im SO ist ganz schwach und leicht bräunlich - Helligkeitsunterschied mindestens 4 Größenklassen - ein sehr ungleiches Paar

STF122

6^m.7

9^m.5

5.7"

329°

2013

Psc

01^h26^m53.55^s / +03°32'08.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

pretty white and orange, PA to N, ~3 delta mag, 6-8"

BU1102

10^m.3

0.9"

340°

2009

Cas

01^h27^m17.87^s / +60°16'58.50"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

A very faint fine pair, best seen with 333x, significant delta and just split, blue for faintness. Near to a bright star

AC14

8^m.3

8^m.9

0.7"

93°

2018

And

01^h28^m19.28^s / +42°46'56.00"

Robert Zebahl

Leipzig (Germany)

152mm (300x)

Immediately visible as a double star, almost separated with little difference in brightness.

★★★

S398

6^m.3

8^m.0

68.9"

100°

2018

Psc

01^h28^m22.92^s / +07°57'40.90"

Christopher Hay Seeheim (Germany)	7x50	On tripod. Wide split. A orange-red, B a tiny pinprick of light. Attractive sight in 7.3° field of view, with Zeta Psc neatly on western edge of FOV. Physical double according to Stelledoppie. Three-star rating awarded because this is a physical double that can be resolved at 7x, while dominating the field of view with more power and presenting a strong colour contrast with more aperture (see 20x80 observation below). As an added bonus, S398 is just half a degree south of the ecliptic and is thus visited regularly by planets and the moon.
Christopher Hay Seeheim (Germany)	20x80	Wide split. A reddish-white, B blue-white. Very strong visual presence with no competition in 2.5° field of view, accentuated nicely by 6-mag 96 Psc about 2/3° to the south.
Mark McCarthy Fremont (California/USA)	317mm (553x)	orange with 1 delta mag white to east.

ES4

8^m.1

9^m.1

2.8"

101°

2016

And

01^h31^m05.02^s / +43°37'14.60"

Robert Zebahl Leipzig (Germany)	70mm (128x)	Not split. I probably didn't recognised the fainter component. The angular distance shouldn't be a problem.
Mark McCarthy Fremont (California/USA)	508mm (333x)	Split with 333x, ~1.5" 2 delta mag.

STF128

8^m.1

10^m.4

11.4"

310°

2015

Cas

01^h31^m41.16^s / +61°02'34.30"

René Merting Drachhausen (Germany)	100mm (64x)	erst bei 64x offenbarte sich mir der Begleiter, das lag nicht am Abstand, sondern an der Schwäche von Komponente B - bei dieser Vergrößerung sind beide Sterne nämlich schon ordentlich getrennt - Komponente B im NW ist 2 bis 2.5 Größenklassen schwächer
Uwe Pilz Leipzig (Germany)	105mm (288x)	einfach

STT31

6^m.5

10^m.6

4.0"

78°

1991

Psc

01^h33^m18.28^s / +08°12'31.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange with very faint glow, AV only, to east. ~4-5", 3 delta mag.

STF136, 100 Psc

7^m.3

8^m.3

15.7"

77°

2016

Psc

01^h34^m51.61^s / +12°33'31.20"

7^m.3

13^m.6

76.9"

312°

2015

7^m.3

11^m.6

124.5"

8°

2015

Robert Zebahl Leipzig (Germany)	70mm (22x)	AB: At 22x easy to separate with well visible difference in brightness. A difference in color is visible, but the assignment of colors was difficult. At 44x A appeared slightly orange, B rather bluish.
Mark McCarthy Fremont (California/USA)	152mm (175x)	AB: White, 1 delta mag, very wide. WDS says physical based on proper motions, but they do not share their parallax ranges (-53%), so are not binary

STF138

7^m.5

7^m.6

1.7"

60°

2018

Psc

01^h36^m02.86^s / +07°38'42.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Tight near equal pair, yellow-white, 2" or so.

★

STT33 & DOB2

STT33

7^m.3

9^m.0

26.9"

77°

2015

Cas

01^h37^m22.87^s / +58°38'14.70"

DOB2

7^m.3

10^m.3

107.0"

109°

2015

René Merting Drachhausen (Germany)	12x42	STT33 (AB): B ist relativ schwach östlich von A erkennbar, getrennt und relativ dicht stehend - Helligkeitsunterschied zwei Größenklassen
René Merting Drachhausen (Germany)	16x70	STT33 (AB): ein isoliert stehendes gut getrenntes Pärchen mit schönem Farbkontrast - Komponente B im Osten wirkt rot-braun, weil die weiße Komponente A gut 1.5 Größenklassen heller ist
René Merting Drachhausen (Germany)	100mm (20x)	STT33 (AB): bei 32x stehen beide Komponenten weit auseinander - Komponente B im Osten ist gut 1.5 Größenklassen schwächer als A - Farbkontrast rein weiß (A) vs. orange-braun (B) - südöstlich von A in 4-facher Entfernung AB steht ein weiterer schwacher Stern (Komponente C mit 10.29 mag/ AC mit eigener Bezeichnung: DOB 2) - zurück auf 20x bilden A und B ein schönes enges Paar, Komponente C ist auch noch knapp erkennbar
René Merting Drachhausen (Germany)	100mm (32x)	DOB2 (AC): Komponente C als Anhängsel von STT33 - Komponente C ist bei 32x sehr weit südöstlich von A erkennbar, vierfacher Abstand AB (STT33) - zurück auf 20x sind alle drei Komponenten ebenfalls noch zu erkennen
Mark McCarthy Fremont (California/USA)	317mm (340x)	STT33 (AB): Pretty yellow-white and red-orange pair, wide, 1.5-2 delta mag. Nearby X Cas a very pretty red.

STF141

8^m.3

8^m.6

1.7"

303°

2018

And

01^h40^m03.42^s / +38°58'10.70"

Robert Zebahl

Leipzig (Germany)

102mm (125x)

Clearly separated, but still very close. Slightly uneven.

KR12

8^m.3

9^m.2

0.4"

294°

1991

Cas

01^h41^m33.95^s / +62°40'36.60"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Light orange stars, noticeable mag difference, strongly notched but not split

HJ1088

6^m.3

9^m.8

19.5"

168°

2015

Cas

01^h42^m17.70^s / +58°37'39.80"

René Merting Drachhausen (Germany)	12x42	keine Chance trotz 19,5" Abstand - der Helligkeitsunterschied ist vermutlich zu groß
René Merting Drachhausen (Germany)	100mm (32x)	erst bei 32x zeigt sich der schwache Begleiter weit getrennt südlich von A - Größenklassenunterschied enorm bzw. nicht abschätzbar - Komponente A ist weiß mit einem Stich ins Gelbe (ich kann mich aber auch täuschen), B hat keine Farbe, wohl zu schwach auf der Brust - ein Doppelstern für Puristen

MLR630

7^m.9

7^m.8

0.3"

211°

2010

Cas

01^h42^m57.74^s / +58°06'57.00"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Slight elongation of white star, but no more resolution seen

★

BU1103, 44 Cas

5^m.8

12^m.1

1.6"

0°

2005

Cas

01^h43^m19.75^s / +60°33'04.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

44 Cas. Extremely fine, extremely faint spec consistently in one spot in the diffraction, 1", when seeing perfects. Need a slight averted vision to see it.

STF150

7^m.7

8^m.2

35.7"

196°

2015

Cet

01^h43^m22.43^s / -07°04'37.30"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x zeigen zwei ordentlich getrennte annähernd gleichhelle Sterne, Komponente A im Norden ist vielleicht eine halbe Größenklasse heller - leichter Farbkontrast, A weiß, B grauweiß

STF155

7^m.9

8^m.0

4.9"

325°

2018

Psc

01^h44^m15.19^s / +09°29'02.70"

Robert Zebahl Leipzig (Germany)	70mm (44x)	Lovely embedded in a small group of stars. The components showed a small difference in brightness and were very close together.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Nice near equal brightness white pair, ~5"

V773 Cas

BU870

6^m.3

8^m.7

0.6"

332°

2010

Cas

01^h44^m17.96^s / +57°32'11.80"

GUI2

6^m.3

16^m.0

18.3"

57°

2015

ARN55

6^m.3

9^m.9

160.5"

45°

2003

Mark McCarthy Fremont (California/USA)	317mm (553x)	AD: Very wide separation 1 delta mag. physical double. This is the AD pair of a more complicated system. AB = V773 Cas = BU 870 which is 6.29/8.68 0.3", AC = GUI 2, 6.29/16.00 16.8".
Mark McCarthy Fremont (California/USA)	317mm (553x)	AD: Picking up a pinpoint in A's diffraction, very faint with seeing, <1", 3-4 delta mag, white. Marginal.
Mark McCarthy Fremont (California/USA)	508mm (1067x)	AB: Elongated at 667x, with 1067x it is a clear elongation with the B star sticking out like a stump, but not notched. It is now near periastron, and will widen rapidly to 0.448" by 2030. 184.9 year period. Need to go back and make a sketch, since it will be on the opposite side of the A star in 2030

STF149

8^m.2

9^m.3

1.4"

81°

2018

And

01^h44^m30.83^s / +39°57'31.10"

Robert Zebahl

Leipzig (Germany)

102mm (160x)

At 125x almost split, noticeably uneven. At 160x split, but pretty tight.

★

STF154

8^m.6

8^m.8

5.2"

127°

2016

And

01^h45^m02.50^s / +43°42'22.80"

Robert Zebahl Leipzig (Germany)	102mm (62x)	2020-11-02: At 28x clearly elongated, at 62x very finely separated with similar bright components. Pale orange & pale blue. At 125x similar color impression.
Uwe Pilz Leipzig (Germany)	120mm (128x)

STF151

10^m.6

11^m.0

7.2"

39°

2016

Cas

01^h45^m59.32^s / +61°12'45.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Equal, fairly faint but by no means the faintest in a very rich field. Visible in 80mm finder.

STF152

9^m.0

11^m.2

9.4"

106°

2015

Cas

01^h46^m04.90^s / +61°13'41.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

A about 11th mag and B wide separation 1.5 delta mag. not physical

STF153

9^m.4

10^m.4

7.7"

69°

2015

Cas

01^h46^m34.53^s / +61°15'45.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Well separated ~10", 1 delta mag pair

STF158

9^m.0

9^m.4

2.2"

272°

2018

Tri

01^h46^m44.07^s / +33°09'45.50"

Mark McCarthy Fremont (California/USA)	203mm (205x)	Nice split, pretty wide considering low magnification. Orange-yellow stars about half delta mag
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern noch gut zu trennen. Der Helligkeitsunterschied beträgt knapp eine Magnitude und der etwas hellere Stern leuchtet gelblich und der schwächere orange gelb.

STF162

6^m.5

7^m.2

2.0"

199°

2018

Per

01^h49^m15.47^s / +47°53'47.10"

6^m.5

9^m.2

20.6"

178°

2019

6^m.5

10^m.0

138.7"

96°

2007

7^m.2

9^m.2

19.2"

177°

2018

René Merting Drachhausen (Germany)	16x70	AC: ein schwieriges Paar aufgrund des Helligkeitsunterschiedes - mit etwas Geduld offenbart sich Komponente C knapp südlich von A sehr dicht an dessen hellem Glanz - die Trennung ist nur in ruhigen Momenten kurzzeitig sichtbar
Robert Zebahl Leipzig (Germany)	70mm (100x)	AB: At 100x partly split, otherwise '8'-shaped. At 128x clearly split. Difference in brightness noticeable.

BU1016

9^m.9

10^m.1

0.7"

43°

2015

Tri

01^h49^m46.70^s / +33°03'57.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Suspect elongation, seeing not supporting higher magnification

★★

1 Ari, STF174

6^m.3

7^m.2

2.9"

164°

2018

Ari

01^h50^m08.60^s / +22°16'29.50"

Robert Zebahl Leipzig (Germany)	63mm (46x)	Clearly split, but tight with noticeable difference in brightness.
Robert Zebahl Leipzig (Germany)	70mm (80x)	At 67x pretty tight pair, but separated with a clear difference in brightness. The primary component appeared in a hint of orange. At 80x easy to separate.
Christopher Hay Seeheim (Germany)	76mm (83x)	1 Arietis is clearly orange (not split) in 12x42 finder. In 3-inch at 83x fine split, primary fiery orange. At 100x split becomes more obvious, at 125x easy, but at expense of loss of colour.
Stefan Loibl Rosenheim (Germany)	102mm (102x)	slight color difference, A orange, B blueish
Sarah Gebauer Germany	150mm (27x)	im Dezember 2019 nicht getrennt
Robert Zebahl Leipzig (Germany)	200mm (100x)	Conditions in the target region: SQM-L 20.8 Nice double star with big difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (533x)	1 Ari. ! Very beautiful yellow-orange A and robin's egg blue B, 3", one delta mag. probably one of the best color pairs
Mark McCarthy Fremont (California/USA)	317mm (553x)	Pretty orange and blue pair, ~2 delta mag, ~2".
Karsten Kopp Köln (Germany)	600mm (180x)	Gut zu trennender Doppelstern mit schon auffälligem Helligkeitsunterschied. Der hellere leuchtet gelblich und der schwächere geht ins bläuliche. Schöner Doppelstern.

STF175

9^m.0

9^m.4

28.6"

0°

2019

Ari

01^h51^m01.96^s / +21°06'56.10"

Mark McCarthy

Fremont (California/USA)

317mm (340x)

Near equal white, fairly wide separation

HO311

8^m.2

7^m.8

0.4"

178°

2018

Ari

01^h51^m13.34^s / +24°39'08.00"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Nice clear split with seeing, more near equal but there is a noticeable magnitude difference, white stars

STF163

6^m.8

9^m.1

34.5"

38°

2018

Cas

01^h51^m16.93^s / +64°51'17.90"

René Merting Drachhausen (Germany)	16x70	ein ordentlich getrenntes Pärchen - Komponente A im SW strahlt gelblich, B im NO ist schwach erkennbar, aber nicht schwer
Robert Zebahl Leipzig (Germany)	70mm (20x)	Easily split at 20x. From 44x the brighter component was orange colored, the fainter one tends to be more bluish.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Pretty orange star in the 80mm finder. Wide separated blue B, 2 delta mag.

HJ2089

8^m.5

9^m.2

29.0"

306°

2015

And

01^h51^m23.25^s / +43°28'35.30"

René Merting

Drachhausen (Germany)

320mm (72x)

bei 72x zeigen sich zwei relativ schwache Sterne, komfortabel getrennt - B im NW wirkt ein wenig kupfern gegenüber der weißen A-Komponente

STF178

8^m.2

3.0"

205°

2018

Ari

01^h52^m02.54^s / +10°48'38.10"

Robert Zebahl Leipzig (Germany)	63mm (67x)	Clearly split, tight, apparently equally bright components.
Robert Zebahl Leipzig (Germany)	70mm (100x)	Split with equally bright components.
Karsten Kopp Köln (Germany)	600mm (180x)	Gut zu trennender Doppelstern, mit kaum auszumachenden Helligkeitsunterschied.

J671

11^m.6

11^m.8

2.7"

153°

2016

Ari

01^h52^m58.18^s / +21°52'13.10"

Mark McCarthy Fremont (California/USA)	508mm (533x)	B star is faint but not difficult, ~3", very nice
Karsten Kopp Köln (Germany)	600mm (180x)	Dieser Doppelstern war eine kleine Herausforderung, da beide Sterne recht lichtschwach sind und auch der Helligkeitsunterschied mit 9,7 mag und 12,0 mag laut SkySafari (passt auch ganz gut zu meiner Beobachtung) eine Sichtung bei aufgehelltem Himmel nicht gerade einfach erscheinen lässt

★

STF179

7^m.6

8^m.1

3.5"

160°

2018

And

01^h53^m10.72^s / +37°19'16.30"

Robert Zebahl Leipzig (Germany)	102mm (62x)	2020-11-02: At 62x very nice sight! Finely separated pair of almost equally bright components. At 125x a small difference in brightness is visible. Pale orange & slightly bluish.
Uwe Pilz Leipzig (Germany)	120mm (150x)
Mark McCarthy Fremont (California/USA)	317mm (553x)	Near equal magnitude, 4", nice orange-yellow color.

BU260

8^m.8

9^m.0

1.1"

261°

2018

Ari

01^h53^m14.21^s / +15°26'00.30"

Mark McCarthy

Fremont (California/USA)

203mm (533x)

Fine pair, well split, half delta mag

★★

gamma Ari, STF180

4^m.5

4^m.6

7.4"

1°

2020

Ari

01^h53^m31.76^s / +19°17'38.60"

Christopher Hay Seeheim (Germany)	15x60	In brief moments definitely split with a hair's breadth of black in-between. The rest of the time tantalisingly close to popping apart. Brightness difference distinct enough at all times to identify the southern star as the A component. Both components pure white.\A physical pair 164 light years distant from us. Also known in ancient times as the "First Star in Aries", as it was closest then to the vernal equinoctial point on the ecliptic
Christopher Hay Seeheim (Germany)	42mm (12x)	Clearly elongated, slightly notched in middle.
Christopher Hay Seeheim (Germany)	76mm (83x)	A strong matched pair. Both white. 1st diffraction rings just touching.
Stefan Loibl Rosenheim (Germany)	102mm (41x)	easily split at 41x, no color difference, nice view with 8m star HD11557 in the same FOV
Robert Zebahl Leipzig (Germany)	200mm (80x)	Nice, obvious double star. Both components have similar brightness and appeared white.
Mark McCarthy Fremont (California/USA)	203mm (533x)	Gamma Arietis = Mesarthim: Perfectly equal pair, wide, very white
Mark McCarthy Fremont (California/USA)	317mm (277x)	Gamma Ari. Equal yellow-white, wide, bright.
Karsten Kopp Köln (Germany)	600mm (180x)	Einfacher Doppelstern, mit fast identischer Helligkeit.

COU352

11^m.0

11^m.6

1.0"

21°

2015

Ari

01^h54^m23.02^s / +17°53'43.80"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Faint pair, smeared, elongated and resolves with seeing and averted vision

HEI433

10^m.8

11^m.6

3.6"

192°

2015

Ari

01^h54^m28.42^s / +17°37'49.70"

Mark McCarthy Fremont (California/USA)	508mm (533x)	11th mag B star easier since wider separation, faint, half delta mag, wide pair
Karsten Kopp Köln (Germany)	600mm (180x)	Etwas schwieriger Doppelstern, da beide Sterne recht lichtschwach sind. Ein leichter Helligkeitsunterschied ist zu erkennen und der schwächere leuchtet leicht orange.

HEI208

11^m.4

11^m.8

1.4"

180°

2015

Ari

01^h54^m37.99^s / +14°05'34.20"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Very faint, need to wait for seeing, splits with seeing and a little averted vision, ~1.5", half delta mag

A2323

9^m.5

10^m.9

1.7"

146°

2017

Ari

01^h54^m45.56^s / +17°28'01.40"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Fine pair, easily seen B, not difficult since wider separation. ~1.5", 1.5 delta mag

STF183

AB-C

7^m.7

9^m.3

5.6"

162°

2018

Tri

01^h55^m07.39^s / +28°47'52.60"

Sarah Gebauer

Germany

100mm (73x)

die schwächere Komponente wurde erst auf den zweiten Blick sichtbar, eine reizvolle Konzentrationsübung

../projects/double-stars/sarah-gebauer/sketches/STF%20183.jpg

STF170

7^m.5

8^m.2

3.2"

244°

2016

Cas

01^h55^m27.35^s / +76°13'28.40"

Robert Zebahl Leipzig (Germany)	70mm (57x)	At 57x barely split with noticeable difference in brightness. At 128x easy split.
Mark McCarthy Fremont (California/USA)	152mm (175x)	Nice and clean split, light blue A and light orange B, 1 delta mag. WDS uncertain, but there is some chance it is binary: 16% parallax range overlap, 559 AU weighted separation, 2.36/1.97 Msol

★

COU453

10^m.4

10^m.8

0.7"

282°

2016

Ari

01^h56^m19.96^s / +25°20'24.00"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

I get clean split, the B star is very faint and just within A's diffraction ring, but it's there. Great!

★

STF182

8^m.3

3.6"

125°

2016

Cas

01^h56^m23.56^s / +61°16'52.00"

Robert Zebahl

Leipzig (Germany)

70mm (57x)

At 44x almost split. At 57x equally bright components visible.

STF189

9^m.9

11^m.0

9.0"

269°

2015

Ari

01^h57^m09.47^s / +18°57'32.20"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Orange and blue stars, wide, surprised these are nice hard points

★

A1920

9^m.5

10^m.1

1.8"

236°

2018

Tri

01^h57^m52.62^s / +33°10'19.60"

Mark McCarthy Fremont (California/USA)	203mm (205x)	Nice clean split, very pretty white stars, seems a bit more than half delta mag
Karsten Kopp Köln (Germany)	600mm (257x)	Doppelstern war nur sehr knapp zu trennen. Der Helligkeitsunterschied liegt bei knapp 1,5 mag, eventuell auch leicht mehr.

★★

H5 12, 9 Ari, lambda Ari

4^m.8

6^m.7

37.3"

48°

2019

Ari

01^h57^m55.71^s / +23°35'45.80"

Robert Zebahl Leipzig (Germany)	8x44	2020-11-25: Easily separable with noticeable difference in brightness. Primary component appeared slightly yellowish with dim companion.
Robert Zebahl Leipzig (Germany)	70mm (15x)	Easy to split with large distance and difference in brightness.
Stefan Loibl Rosenheim (Germany)	102mm (41x)	easily split, both components white, no color difference
Uwe Pilz Leipzig (Germany)	105mm (200x)	der helle Stern ist blauweiß
Christopher Hay Seeheim (Germany)	180mm (113x)	AB: A strong pair dominating the 0.6° field of view. B presents a weak ochre colour tone, in charming contrast to pearly-white component A. According to Stelledoppie a physical pair at a distance to us of 129 light years.

S404

7^m.6

9^m.7

29.2"

84°

2015

And

01^h58^m04.61^s / +41°23'09.50"

René Merting

Drachhausen (Germany)

16x70

der Doppelstern liegt südwestlich einer auffälligen Sternkette, die sich von SO nach NW zieht - mit etwas Geduld ist Komponente B knapp östlich von A zu erkennen - A ist nicht die hellste Leuchte, B noch deutlich schwächer

FRK3

6^m.7

9^m.7

44.3"

224°

2015

Cas

01^h58^m18.54^s / +59°37'33.40"

René Merting Drachhausen (Germany)	12x42	A ist sehr hell, B in etwas Abstand so schwach, dass man genau hinschauen muss - beide stehen so isoliert im Raum, dass sich der Eindruck ergibt, sie würden in ein schwarzes Loch gezogen
René Merting Drachhausen (Germany)	16x70	ein ungleiches Paar - Komponente B steht gut getrennt südwestlich und ist mehr als 2 Größenklassen schwächer und wirkt dadurch grau-braun im Vergleich zu A
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x schon weit auseinander - Komponente A ist schneeweiß, die viel schwächere Komponente B im SW eher braungrau - zurück auf 20x zeigt sich ein immer noch ordentlich getrenntes Pärchen, der Farbkontrast ist jetzt nicht mehr ganz so auffallend

AG28

9^m.8

10^m.8

3.2"

175°

2015

Tri

01^h58^m25.93^s / +31°55'42.70"

Mark McCarthy Fremont (California/USA)	203mm (205x)	Fine pair, well split, one delta mag white-blue stars
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist gut zu trennen, der Helligkeitsunterschied liegt bei 1 mag und der hellere leuchtet weißlich gelb und der schwächere weiß.

STF194

7^m.6

9^m.5

1.3"

279°

2018

Ari

01^h59^m18.95^s / +24°49'44.60"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Fairly faint 1.5" near equal magnitude, maybe 1/2 delta mag. Slightly orange, pretty.
Mark McCarthy Fremont (California/USA)	508mm (533x)	Lovely white pair, near equal, well separated, ~3"

STF200

9^m.6

10^m.3

8.1"

124°

2018

Ari

02^h01^m36.23^s / +24°05'22.30"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Wide separated white pair, more than one delta mag

BU513, 48 Cas

4^m.7

6^m.7

0.6"

320°

2013

Cas

02^h01^m57.55^s / +70°54'25.40"

Mark McCarthy Fremont (California/USA)	152mm (285x)	Overlapping disks at all powers, 1 delta mag. Burnham says: "This most interesting binary was discovered with the 18.5-inch, but at that time it was easily seen with the 6-inch. It is now (1898) a very difficult object, and only measurable with a large aperture under the best conditions." 1.0" at discovery, it is now 0.4" and found to have a 61.14-year period and will continue to tighten until the 2040s. I don't find Gaia data on the secondary
Mark McCarthy Fremont (California/USA)	317mm (553x)	Searched around the swollen, shimmering bright A star disk and felt there was a faint close B trying to resolve in the first diffraction at 553x. Apodizing mask cleaned up the image but no B resolved

alpha Psc, 113 Psc, Alrischa, Kaitain, Okda

STF202

4^m.1

5^m.2

1.9"

264°

2019

Psc

02^h02^m02.80^s / +02°45'49.40"

PWL1

4^m.1

8^m.2

404.9"

63°

2006

PWL1

4^m.1

8^m.6

434.5"

335°

2006

Winfried Kräling Marburg (Germany)	102mm (178x)	AB
Uwe Pilz Leipzig (Germany)	105mm (88x)	AB: der hellere Stern ist weiß

STF185

6^m.8

8^m.6

1.1"

9°

2007

Cas

02^h02^m09.27^s / +75°30'07.90"

Mark McCarthy

Fremont (California/USA)

152mm (285x)

Very close hairline with 175x, about 2 delta mag, steady split with 285x. WDS uncertain, however there is -83% parallax range overlap, so it cannot be

★★

STF201, eps Tri

5^m.5

11^m.4

4.2"

119°

1990

Tri

02^h02^m57.97^s / +33°17'02.90"

Mark McCarthy Fremont (California/USA)	203mm (205x)	Epsilon Tri. Very nice! Bright A star is a white blaze, and outside of its glow is very small point of the B star, very fine. Very nice indeed
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist an sich gut zu trennen, hier liegt der große Reiz in dem Helligkeitsunterschied von knapp 6 mag. Der helle Stern erstrahlt bläulich weiß.

STF191

6^m.2

9^m.1

5.3"

196°

2015

Cas

02^h03^m10.45^s / +73°51'02.10"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Ice blue A and light orange B, 2 delta mag, well separated. A seems out of round. WDS asserts it's physical however there is -1% parallax overlap, 603 AU weighted separation, 2.48/1.23 Msol. Only time will tell

★

STF208, 10 Ari

5^m.8

7^m.9

1.3"

349°

2018

Ari

02^h03^m39.26^s / +25°56'07.60"

Uwe Pilz Leipzig (Germany)	105mm (200x)	helle Stelle im ersten Ring
Mark McCarthy Fremont (California/USA)	317mm (553x)	~2 delta mag, ~1" very nice. ~1 disk split. Nice!

★★★

gamma And, 57 And, Alamak

STF205

A-BC

2^m.3

5^m.0

9.6"

63°

2019

And

02^h03^m53.92^s / +42°19'47.50"

STT38

5^m.3

6^m.5

0.2"

96°

2010

BAR22

2^m.3

15^m.0

27.9"

245°

1898

Robert Zebahl Leipzig (Germany)	63mm (42x)	A-BC: Easy to split with quite large difference in brightness.
Christopher Hay Seeheim (Germany)	71mm (32x)	Fine split. A is mandarine orange. BC has trouble displaying its colour due to the overpowering light of A, but in good moments is clearly blue. A-BC is a physical double at a distance to us of 393 light years. BC is also physical, with a relatively short period of 63 years for C to circle B and a very tight periastron. Unobservable in 2013 at periastron with 0.1". Since then the angular separation has been widening rapidly and will reach 0.4" in 2029. B-C will then become observable in large amateur telescopes for three decades, after which C will fall quickly back to B.
Uwe Pilz Leipzig (Germany)	105mm (52x)	A-BC: einfach
Uwe Pilz Leipzig (Germany)	120mm (128x)	A-BC
Robert Zebahl Leipzig (Germany)	152mm (100x)	A-BC: Very easy. A: orange, BC: rather white.
Christopher Hay Seeheim (Germany)	180mm (110x)	A very strong pair in 0.6° FOV with powerful colour contrast, A yellow, BC ice blue.
René Merting Drachhausen (Germany)	320mm (45x)	A-BC: bei 45x ein knapp getrenntes Pärchen - Komponente A knallgelb mit einem Anhängsel nordöstlich - Komponente BC strahlt 3 Größenklassen schwächer - bei 144x wirkt BC grün-weiß, bei 45x war der Eindruck noch leicht gelblich
Mark McCarthy Fremont (California/USA)	508mm (667x)	BC: Component of STF 205, of which A is a brilliant orange and BC bright blue. In BC I can only see elongation through the speckle at 667x and 1067x. Short 62.63 year period which will get "easier" to about 0.2" by 2045
Mark McCarthy Fremont (California/USA)	508mm (1067x)	BC: I spent a good long while on this one, and tried hard to nail down the position angle. At 1067x, both with and without an apodising mask, but both times with a #80A light blue filter, which did seem to calm the diffraction a little, I had a clear view of the elongation with a strong sense of the weaker end being to the East or to the ESE. I also tried a 78% central obstruction mask, and while the diffraction became a grid, and the disks much smaller, I could clearly see the same elongation and weaker end, though at a much smaller scale. To my delight the current orbital solution puts the PA at 120.6-degrees, 0.179" separation, so I think I have detected it. I can't wait until 2033 when this becomes an easy pair!

Winfried Kräling Marburg (Germany)	127mm	A-BC: Aufnahme vom 11.09.2020 am 127/1200mm Refraktor mit Barlowlinse (~2.5x) Weit getrennt, Komponente A: goldgelb bis orange, Komponente BC: weißlich blau
Werner E. Celnik Rheinberg (Germany)	150mm	A-BC

STF212

8^m.3

8^m.7

1.9"

162°

2018

Ari

02^h06^m14.96^s / +25°06'31.00"

Robert Zebahl Leipzig (Germany)	63mm (168x)	Not split, but partially seen as an '8'. Overall the double star appeared rather faint and both components seemed to be similarly bright.
Robert Zebahl Leipzig (Germany)	70mm (128x)	Barely split with slight difference in brightness.
Mark McCarthy Fremont (California/USA)	317mm (170x)	A star is deformed shaped, could be very close near equal pair but seeing is poor and cannot resolve

TDS2117

10^m.8

11^m.0

2.1"

14°

2015

Ari

02^h06^m24.51^s / +21°41'56.00"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Fine near equal white pair, well separated to wide

HO312, 11 Ari

6^m.0

11^m.5

1.7"

340°

2004

Ari

02^h06^m49.22^s / +25°42'16.50"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

11 Ari Used apodizing screen to tone A down. B is bluish & resolves out on the edge of A's diffraction with seeing and is very, very faint compared to A

14 Ari

5^m.0

8^m.0

93.1"

35°

2014

Ari

02^h09^m25.29^s / +25°56'23.90"

5^m.0

8^m.0

106.0"

279°

2014

Christopher Hay Seeheim (Germany)	7x50	On tripod. C presents as a micro-fine point of light, set off well from A. No trace of B, see on this my observation in the same night with 180mm aperture.
Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. C far distant from A. Due to this distance and the major delta-mag the two stars do not present the appearance of a double, C looks rather like a field star. Yet in fact the two are a true physical double at a distance to us of 289 light years.
Christopher Hay Seeheim (Germany)	71mm (13x)	A-C wide split, C a fine little point of light. Visually un-exciting as such, the attraction of this pair resides partly in contemplating that it is a true physical double. Furthermore, in this small refractor 14 Arietis AC can be observed together with another physical double in the 5.5° FOV, namely Lambda Arietis (listed here as H5 12).
Christopher Hay Seeheim (Germany)	180mm (113x)	Components A, B and C from a wide grouping. B is very faint, somewhere around 11m to 12m, in contrast to the 8m0 stated by Stelledoppie. Observed on 12 February 2021. Is B variable? DSS sky survey shows the same delta-mags that I saw, so it rather appears that Stelledoppie has a mistake in its database. A is creamy white, C grey, B too faint for any definite colour impression. According to Stelledoppie a physical triple system at a distance to us of 289 light years.

STF221

8^m.1

9^m.4

8.5"

145°

2015

Ari

02^h09^m42.76^s / +20°20'53.30"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Orange and blue pair, 2 delta mag., ~8" Pretty.

STF219

8^m.0

8^m.9

11.7"

186°

2015

Tri

02^h10^m16.10^s / +33°21'55.20"

Robert Zebahl Leipzig (Germany)	16x70	2020-11-07: Immediately visible elongated, partly separated.
Robert Zebahl Leipzig (Germany)	55mm (25x)	Well separated with noticeable difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Pretty white, bright A star and wide B, three delta mag
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist einfach zu trennen. Helligkeitsunterschied ist schon etwas größer und beide Sterne erstrahlen weißlich.

COU1068

10^m.7

11^m.2

1.1"

246°

2015

Tri

02^h10^m18.35^s / +35°10'24.10"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Seeing isn't what it needs to be. Suspected elongation at 205x, 333x elongated it more but did not split, the star images are too hairy

★

STI1797

7^m.5

11^m.8

8.6"

142°

2015

Per

02^h10^m24.05^s / +56°17'49.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Pretty orange and blue stars, 2-3 delta mag, well separated 10"

STF224

8^m.3

8^m.9

5.9"

243°

2020

Ari

02^h10^m52.01^s / +13°41'00.40"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Near equal brightness white pair, ~10", nice split.

★★

59 And, STF222

6^m.0

6^m.7

16.6"

36°

2019

And

02^h10^m52.83^s / +39°02'22.40"

Robert Zebahl Leipzig (Germany)	8x44	2020-11-25: Just separated with visible difference in brightness.
René Merting Drachhausen (Germany)	16x70	ein sehr dichtes Sternpaar, ganz knapp getrennt sichtbar - Komponente B im NO ist eine halbe Größenklasse schwächer - leichter Farbunterschied und das Phänomen, dass der Farbkontrast zwischen beiden Sternen immer hin und her springt - ich kann nicht genau sagen, welcher Stern das kühlere oder wärmere Weiß hat
Christopher Hay Seeheim (Germany)	71mm (32x)	Widely separated. Primary slightly orange, secondary blueish. Very attractive and without visual competition in 2.5° FOV. A physical double at a distance to us of 456 light years.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein auffälliges Sternpaar - gut getrennt mit leichtem Farbkontrast, Komponente A im SW ist weiß, die Komponente B zwar auch, aber mit einem Stich ins orange, eigenartig - Helligkeitsunterschied eine halbe Magnitude
Robert Zebahl Leipzig (Germany)	120mm (18x)	Well split with noticeable difference in brightness.
Robert Zebahl Leipzig (Germany)	200mm (100x)	Conditions in the target region: SQM-L 20.4 Nice and evident double star, easy to split. About 12 arcminutes NE there is NGC828 (v12.3m),

STF226

8^m.0

9^m.6

1.8"

231°

2017

Ari

02^h12^m15.40^s / +23°57'29.50"

Sarah Gebauer Germany	100mm (136x)	leider nicht getrennt, 1,8'' müssten bei besserem Seeing aber machbar sein
Mark McCarthy Fremont (California/USA)	317mm (277x)	Near equal mag. orange, but split is lost in poor seeing, appears oval with 170x., it appears as two lobes awash in diffraction at 277x

★★★

STF227, iota Tri, 6 Tri

5^m.3

6^m.7

3.7"

69°

2016

Tri

02^h12^m22.28^s / +30°18'11.10"

Robert Zebahl Leipzig (Germany)	70mm (57x)	At 44x even separable with a clear difference in brightness, whereby the companion is almost outshone by the primary component. At 57x easy to separate. Primary component shines in bright orange, companion slightly orange. Beautiful sight together with STF232 in one field of view!
Uwe Pilz Leipzig (Germany)	105mm (88x)	weiß und blau
Christopher Hay Seeheim (Germany)	180mm (110x)	Well separated. Primary yellowish, secondary light blue. When 6 Tri drifts out of 0.6° FOV, STF232 drifts in. 6 Tri is a physical double at a distance to us of 291 light years.
Mark McCarthy Fremont (California/USA)	203mm (205x)	6 Tri. Yellow A, white b, pretty. Wide, about two delta mag
Frederik Wanink Itterbeck (Germany)	254mm (200x)	Helligkeitsunterschied deutlich
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist noch gut zu trennen und der Helligkeitsunterschied ist mit gut 1,5 mag schon sehr auffällig. Der hellere Stern erstrahlt schön gelblich, der schwächer weiß. In den Momenten der wirklich ruhigen Luft, ein sehr schöner Doppelstern

★★★

STF231, 66 Cet

5^m.7

7^m.7

16.8"

235°

2019

Cet

02^h12^m47.54^s / -02°23'37.10"

Christopher Hay Seeheim (Germany)	30x80	Wide split. A is cream-white, B of indeterminate colour. Attractive pair in 1.7° FOV, scenery accentuated by 63 Psc about 3/4° to northwest. While pleasant with 30x80, the pair becomes suprisingly difficult to split with 20x80, presumably due to the cumulative effect of 2m delta-mag and the red colour of the companion, which makes it stand out less than if it were blue (colour not seen, but stressed by Uwe Pilz in his 105mm observation, see below).
Uwe Pilz Leipzig (Germany)	105mm (88x)	weiß und leuchtend rot!

★

S405

6^m.5

7^m.2

55.7"

278°

2019

Cep

02^h12^m49.98^s / +79°41'29.30"

7^m.2

13^m.9

51.2"

224°

2015

Christopher Hay Seeheim (Germany)	10x42	AB: B well set off from A. South 405 (aka STTA 22 and H5 84) is a physical double at a distance to us of 121 light years.
Christopher Hay Seeheim (Germany)	15x60	AB: Wide pair. A seems a little yellowish.
Christopher Hay Seeheim (Germany)	71mm (32x)	AB: Wide apart. A distinctly brighter and distinctly more yellowish than B.
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x weit auseinander stehendes helles Pärchen - beide Sterne sind etwa gleich hell (laut Stelle Doppie 0.68 mag Helligkeitsunterschied)

STF229

9^m.2

10^m.3

2.5"

356°

2018

Tri

02^h13^m58.92^s / +34°30'50.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Bluish stars, B is a bit faint but wide and clear

★★★

STF232

7^m.8

7^m.9

6.7"

69°

2019

Tri

02^h14^m42.16^s / +30°23'41.20"

Robert Zebahl Leipzig (Germany)	70mm (22x)	Very beautiful view! With all used magnifications together with iota Tri (6 Tri) in one field of view. Separable at 22x, but the components are still quite close together and appear similarly bright. At 44x easy to separate with little difference in brightness. At 57x a very small color difference is visible without being able to clearly name the colors. STF232 was sketched together with 6 Tri.
Christopher Hay Seeheim (Germany)	180mm (110x)	Wide separation. Very even brightness. Northeast secondary appears slightly bluish compared to primary.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Pretty white stars, only a slight delta mag, well split
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern einfach zu trennen und beide Sterne haben die gleiche Hellgkeit. Da beide weißlich strahlen, habe ich den Eindruck, als würden zwei Scheinwerfer aus dem All in unsere Richtung leuchten.

STF230

7^m.9

9^m.4

23.8"

259°

2015

Per

02^h14^m57.07^s / +58°29'26.00"

Robert Zebahl Leipzig (Germany)	16x70	2021-10-07: Located right next to the cluster Stock 2. Medium bright, well split at moderate separation and clear difference in brightness.
René Merting Drachhausen (Germany)	16x70	ein knapp getrenntes Pärchen - Komponente B westlich von A wirkt wie ein schwacher Schimmer - kaum ein Farbunterschied, obwohl B gut 1.5 Größenklassen schwächer ist - bei diesem Helligkeitsunterschied wirkt die schwächere Komponente meist dumpf grau-braun, hier ist das nicht der Fall
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x einfach getrennt - Komponente B im Westen ist gut 1.5 Größenklassen schwächer und grau, A ist auch nicht wirklich strahlend weiß - zurück auf 20x noch immer ein gut getrenntes Pärchen

STF237

9^m.5

9^m.9

14.5"

237°

2015

Ari

02^h15^m42.29^s / +10°46'15.60"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Near equal obvious split. seeing not all that great, full aperture. (B star is 0.1" pair equal mag)

STTA25

6^m.5

7^m.4

102.8"

205°

2015

Per

02^h16^m51.71^s / +57°03'18.90"

René Merting

Drachhausen (Germany)

12x42

ein komfortabel getrenntes Sternpaar - beide Komponenten sind die mit Abstand hellsten Sterne im unmittelbaren Umfeld - B im Südwesten wirkt leicht kupferfarben - mitunter verliert sich der Farbeindruck - der Farbkontrast mit A bleibt

STF240

8^m.3

8^m.6

4.8"

52°

2018

Ari

02^h17^m15.74^s / +23°52'24.80"

Sarah Gebauer Germany	100mm (136x)	trotz gar nicht so geringen Abstands doch ein sehr enges und feines Pärchen, das die Nase eines Grinsegesichtes bildet
Mark McCarthy Fremont (California/USA)	317mm (277x)	Faint but pretty wide separation ~4", equal magnitude yellowish-white.

★

STF234

8^m.7

9^m.4

0.6"

222°

2012

Cas

02^h17^m23.00^s / +61°21'06.50"

Mark McCarthy

Fremont (California/USA)

317mm (885x)

Light orange star, definitely elongated, maybe notched, but no convincing split. Tough little Struve.

STF239

7^m.1

7^m.8

14.0"

212°

2019

Tri

02^h17^m25.29^s / +28°44'42.10"

Robert Zebahl Leipzig (Germany)	16x70	2020-11-07: Very nicely embedded in group of brighter and medium bright stars. Components relatively tight with little difference in brightness. Colorwise inconspicuous. Forms a trapezoid with three other stars in the north.
Robert Zebahl Leipzig (Germany)	55mm (25x)	Easy to split, large distance, noticeable difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Wide, white, one delta mag
Karsten Kopp Köln (Germany)	600mm (180x)	Sehr leicht zu trennender Doppelstern, mit einem gut erkennbaren Helligkeitsunterschied. Die Sterne leuchten gelblich-weiß bzw. weißlich.

STF244

9^m.3

9^m.4

4.4"

290°

2018

Ari

02^h17^m34.01^s / +22°13'50.30"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Pretty faint, equal magnitude ~3-4", well split.

7 Per, BU1170 & S409

BU1170

A-BC

6^m.1

12^m.3

68.7"

358°

2013

Per

02^h18^m04.58^s / +57°30'58.70"

S409

6^m.1

9^m.6

123.3"

136°

2015

BU1170

6^m.1

12^m.4

207.1"

12°

2015

BU1170

11^m.5

11^m.7

0.3"

313°

1958

Mark McCarthy Fremont (California/USA)	317mm (553x)	BU1170 (A-BC): Near the Double Cluster. Pretty orange-yellow star. B star is distant and faint -- how know binary? The B star feels elongated with averted vision.
Mark McCarthy Fremont (California/USA)	317mm (553x)	BU1170 (BC): Near the Double Cluster. Pretty orange-yellow star. B star is distant and faint -- how know binary? The B star feels elongated with averted vision.

STF245

7^m.3

8^m.0

11.0"

294°

2015

And

02^h18^m36.27^s / +40°16'43.70"

René Merting Drachhausen (Germany)	16x70	die schwächere Komponente ist nordwestlich des Hauptsterns zu erkennen - es sind eindeutig zwei Sterne, sie sind aber noch nicht eindeutig trennbar
René Merting Drachhausen (Germany)	100mm (32x)	bei 64x steht Komponente B im NW gut abgesetzt von A - nur geringer Helligkeitsunterschied - zurück auf 32x dann zeigt sich ein nettes eng stehendes Pärchen
Robert Zebahl Leipzig (Germany)	120mm (50x)	Both components well seen with noticeable difference in brightness.

STF246

7^m.8

9^m.3

9.8"

123°

2018

Tri

02^h18^m39.75^s / +34°29'15.60"

Sarah Gebauer

Germany

100mm (73x)

so schwach, dass man den DS beinahe nicht erkennt, der helle Stern Delta Tri muss ausgeblendet werden

STTA26

7^m.0

7^m.3

62.9"

201°

2018

Cas

02^h19^m44.49^s / +60°01'46.40"

7^m.0

11^m.4

73.3"

133°

2015

7^m.3

11^m.4

76.5"

83°

2015

René Merting

Drachhausen (Germany)

12x42

AB: sehr auffällig - zwei annähernd gleich helle Sterne mit leichtem Farbkontrast - die B-Komponente im Südwesten wirkt ein bisschen warmweißer

STF249

7^m.2

9^m.0

2.4"

197°

2018

And

02^h21^m35.66^s / +44°35'59.70"

Robert Zebahl Leipzig (Germany)	63mm (168x)	Not separated. The diffraction disk showed again and again irregularities, which indicated a double star.
René Merting Drachhausen (Germany)	320mm (144x)	erst bei 144x ist Komponente B im Süden von A erkennbar, bei 72x wirkte A noch leicht länglich - B ist gut 1.5 Magnituden schwächer - beide Sterne sind strahlend weiß

BLL7, S Per

10^m.8

11^m.4

69.1"

20°

2018

Per

02^h22^m51.72^s / +58°35'11.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Wide near equal pair

HLD7

8^m.0

9^m.9

1.7"

182°

2016

Per

02^h25^m25.96^s / +58°12'09.30"

Mark McCarthy

Fremont (California/USA)

203mm (533x)

Yellow A and bluish b, just split the faint B, in a swimming mess due to poor seeing

A2329

9^m.4

9^m.6

0.5"

101°

2018

Cet

02^h27^m45.86^s / +04°25'55.90"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Split at 533x but used barlow to confirm the PA accurately since this is a short period pair. Nicely split orange stars, half delta mag. Seeing it now at nearly the furthest extent of its orbit, it will become more difficult with time. The pair is a "mere" 55.91 lightyears away

★★

iota Cas, STF262 & CHR6

CHR6

Aa-Ab

4^m.6

8^m.5

0.6"

42°

2010

Cas

02^h29^m03.96^s / +67°24'08.70"

STF262

4^m.6

6^m.9

2.9"

230°

2017

STF262

4^m.6

9^m.1

6.7"

117°

2015

STF262

4^m.6

8^m.5

210.9"

60°

2016

Robert Zebahl Leipzig (Germany)	55mm (27x)	Only the D component was well visible. The components B & C were not visible even at magnifications up to 167x. The sky was clearly brightened (Bortle 7).
Robert Zebahl Leipzig (Germany)	70mm (120x)	Components A, B and C pretty close together, D far apart. Component B appeared slightly elongated on the first diffraction ring of the primary component. Rewarding!
René Merting Drachhausen (Germany)	100mm (142x)	AB: bei 142x zeigt sich Komponente B im SW mit gut einem Drittel das Abstandes AC, Helligkeitsunterschied 1.5 bis 2 Größenklassen AC: bei 64x getrennt, schöner Farbkontrast, Komponente A ist weiß mit einem Stich ins Gelbe, C leicht bräunlich AD: bei 32x extrem weiter Abstand zwischen A und D, Helligkeitsunterschied mehr als 2 Größenklassen (laut Stelle Doppie sogar 3.85 mag)
Uwe Pilz Leipzig (Germany)	105mm (200x)	Dreifachstern lohnend
Sarah Gebauer Germany	150mm (160x)	bei 160x sind die Komponenten AC getrennt, B leider nicht, die schwache Komponente C versinkt fast im Strahlen der hellen Komponente A, ein sehr reizvoller Anblick! Von Komponente D wusste ich während der Beobachtung noch nichts, sie taucht unter den Feldsternen der Zeichnung auch auf
Robert Zebahl Leipzig (Germany)	152mm (129x)	Component D easy to see even at lowest magnification. Component C is also easily visible at 49x. At 69x the component B is indicated, at 100x clearly visible. C appears slightly grey-bluish and obviously fainter than B. Grand sight at 129x!
Mark McCarthy Fremont (California/USA)	508mm (1067x)	CHR6 (Aa-Ab): This is a component of Iota Cas, STF 262 (which is a really pretty triple). CHR 6 at 1067x and seeing through the speckle image, I get elongation with a suspected blunter end which I assume is the B side, PA to the north [it's actually to the south -- my general orientation is correct but mis-interpret the brighter end]. Physical with 47 year period, currently at periastron and will tighten to 0.2" by 2036

HJL1019

6^m.1

9^m.6

217.1"

323°

2000

Ari

02^h29^m13.68^s / +23°28'08.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very wide separation, 1-2 delta mag star to the west-ish. B star is a 0.4" pair, not seen.

STF268

6^m.7

8^m.5

2.9"

131°

2018

Per

02^h29^m24.96^s / +55°32'10.50"

Robert Zebahl Leipzig (Germany)	70mm (80x)	At 67x the faint companion can be guessed and is still slightly outshined by the primary component. At 80x and 100x relatively well separable with clear difference in brightness, but close together. The companion is close to the first diffraction ring of the primary component.
René Merting Drachhausen (Germany)	100mm (107x)	bei 64x lässt sich der Stern nicht richtig scharf stellen - bei 107x ist Komponente B dann ganz knapp getrennt südöstlich von A erkennbar - Helligkeitsunterschied eine 3/4 Größenklasse (1.78 mag lt. Stelle Doppie)
Robert Zebahl Leipzig (Germany)	152mm (129x)	Easily separable with significant difference in brightness. The fainter companion is nicely separated from the primary component and visible as a tiny star.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange A, faint, wide separated B.

STF263, V528 Cas

8^m.6

10^m.9

15.0"

103°

2015

Cas

02^h29^m37.75^s / +60°39'26.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

At the end of an arc of three stars of similar magnitude. The pair is wide, 2 delta mag. Quadruple system but with a lot of complicated orbital dynamics going on: AB, AC, AD, BC, BD, CD

STF271

5^m.9

9^m.9

12.8"

183°

2015

Ari

02^h30^m32.31^s / +25°14'06.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Pretty white star and much fainter wide B

★

STF270

7^m.0

9^m.7

21.3"

306°

2016

Per

02^h30^m50.65^s / +55°32'54.20"

7^m.0

11^m.4

48.0"

333°

2015

7^m.0

14^m.2

51.1"

281°

2015

9^m.7

14^m.2

32.8"

265°

2015

René Merting Drachhausen (Germany)	16x70	AB: der Doppelstern steht innerhalb einer sehenswerten Formation aus 6 Sternen, die ein gleichseitiges Dreieck bilden - die hellsten drei Sterne bilde eine Seite im Norden, zur Spitze nach Süden werden die Sterne immer schwächer - STF270 steht mitten in der Nordseite - Komponente B ist wie ein kleiner zarter Hauch nordwestlich von A erkennbar, Helligkeitsunterschied mehr als 2.5 Größenklassen - kein reizvoller Fernglas-Doppelstern, aber die Umgebung ist interessant
René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x ein leichter Fang, ein gut getrenntes Pärchen - Komponente B im NW ist zwar sehr schwach, aber direkt immer noch gut erkennbar - Helligkeitsunterschied 3 Größenklassen - Komponente A strahlend weiß, B eher grau, wenn überhaupt als Farbe erkennbar
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Nice orange star with wide B

A968

9^m.0

9^m.5

1.6"

29°

2020

And

02^h31^m15.90^s / +47°02'32.10"

Robert Zebahl

Leipzig (Germany)

102mm (125x)

Clearly split, tight, slightly unequal.

★★★

STF93, alpha UMi, 1 UMi, Polaris

2^m.0

9^m.1

18.4"

236°

2016

UMi

02^h31^m49.09^s / +89°15'50.70"

2^m.0

13^m.8

39.0"

103°

2016

2^m.0

14^m.3

83.2"

194°

2016

Christopher Hay Seeheim (Germany)	71mm (32x)	B well separated, a fine blue pinprick next to luminous yellow A. Alpha UMi, Polaris, is a physical double at a distance to us of 433 light years.
Christopher Hay Seeheim (Germany)	76mm (40x)	B well set off from A. Glare from A is an issue, consciously trying to ignore A helps. Very slight yellowish tone of A. Seeing the difficulty makes it clear why attempts in other nights to split the pair with 25x80 binoculars failed.
René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x knallt die Hauptkomponente A schön hellgelb rein, Komponente B ist als feiner zarter Lichtpunkt knapp daneben erkennbar - Größenklassenunterschied nicht abschätzbar, auf jeden Fall riesig
Christopher Hay Seeheim (Germany)	180mm (113x)	B widely separated from A. A has definite yellowish hue. B luminous aquamarine blue, very attractive.
René Merting Drachhausen (Germany)	320mm (45x)	AB: bei 45x ist B sehr knapp getrennt von A erkennbar - Komponente A strahl auf den ersten Blick weiß, bei genauerem Hinsehen mischt sich ein zartes Gelb unter

STF273

8^m.6

9^m.1

7.2"

0°

2016

Ari

02^h32^m02.89^s / +18°22'25.20"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Prototypical Struve: White, wide, ~1 delta mag

STF272

8^m.3

8^m.4

1.9"

216°

2017

Per

02^h33^m08.71^s / +58°27'44.90"

Robert Zebahl

Leipzig (Germany)

152mm (129x)

Easy to separate, but close together with very little difference in brightness. Beautiful view. Double star stands in a half arc of stars.

HJ2143

8^m.1

9^m.6

23.5"

20°

2018

Per

02^h33^m32.79^s / +57°32'14.80"

René Merting Drachhausen (Germany)	16x70	Komponente B ist nur mit viel Konzentration knapp getrennt und sehr schwach nordöstlich von A zu erkennen - schwierig
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein ordentlich getrenntes Pärchen - Komponente B ist sehr schwach, gut 1.5 Größenklassen schwächer - Komponente A ist weiß, B wirkt grau
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x ein weit getrenntes Pärchen, auffallend am südwestlichen Rand der Sternhaufens NGC 957 - Komponente B ist gut 1.5 Magnituden schwächer - A weiß, B rostbraun

HLD63

9^m.7

10^m.0

1.5"

292°

2018

Ari

02^h34^m23.36^s / +11°48'16.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Fine pair, split with seeing, ~1", light orange, slight magnitude difference

A1528

9^m.4

9^m.6

1.6"

193°

2017

And

02^h35^m42.19^s / +44°11'23.30"

Robert Zebahl

Leipzig (Germany)

102mm (160x)

At 125x almost separated with visible difference in brightness. AT 160x rather faint, barely split, little difference in brightness.

★★

AG304, 15 Tri

5^m.6

6^m.8

142.4"

16°

2013

Tri

02^h35^m46.82^s / +34°41'15.20"

Christopher Hay Seeheim (Germany)	7x50	Well split. Main star yellow-orange, secondary an ice-blue pinprick. With overall brightness of 5m1 just visible to naked eye under my suburban sky. Interesting star field with a line of 5 stars pointing S-SW away from 15 Tri and a further striking star chain to the west. Placing Gamma-Delta-7 Tri within 7.5° FOV makes a very attractive overall field. Mira variable R Tri just ½ degree to the S-SE was around maximum at time of observation and presented a much paler orange than 15 Tri A. Charming colour contrast ensemble with the two components of the double plus the variable.
René Merting Drachhausen (Germany)	18x70	ein extrem komfortabel getrenntes Sternpaar - Komponente A im Süden strahlt weißgelb, B ist 1.5 Größenklassen schwächer und wirkt kupfergrau - interessant: parallel zu den beiden Sternen stehen westlich zwei deutlich schwächere Sterne in gleichem Abstand und Positionswinkel wie die Komponenten von 15 Tri - alle 4 Sterne bilden ein Parallelogramm
Christopher Hay Seeheim (Germany)	80mm (30x)	A beautiful, wide pair. Main star orangish yellow, secondary ice-blue. Attractive star field in 2.7° FOV: several similarly-separated pairs to the north and east, and two striking star chains to the south and west.
Sarah Gebauer Germany	100mm (21x)	ein wirklich schönes, farbiges Pärchen, das schon bei geringster Vergrößerung deutlich getrennt und in einem Eisblau und leichtem Orange strahlt, zudem bildet es mit der markanten Sternkette östlich davon, die im Refraktor mit Amiciprisma ein auf dem Kopf stehendes T bildet, ein tolles Gesamtbild

★★

30 Ari

STFA5

6^m.5

7^m.0

37.9"

275°

2019

Ari

02^h37^m00.52^s / +24°38'50.00"

RAO8

7^m.0

11^m.0

0.6"

282°

2018

Robert Zebahl Leipzig (Germany)	8x44	AB: 2020-11-25: Easy to split at still quite small separation and visible difference in brightness. The primary component appeared white-yellowish, the companion darker.
Robert Zebahl Leipzig (Germany)	70mm (22x)	AB: At 22x widely separated, striking with a rather small difference in brightness. A seemed a bit warmer in color compared to B with a hint of orange. At 44x, both seemed slightly orange with very little difference in color.
Uwe Pilz Leipzig (Germany)	105mm (88x)	AB: trennbar bei 22x. Weiß und blau
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Near equal light orange, very wide. B has a C pair 0.6" and 4 delta mag.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Near equal magnitude, wide separated, PA to WSW

STF285

7^m.5

8^m.1

1.7"

162°

2018

Tri

02^h38^m45.91^s / +33°25'08.20"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Very finely split near equal pair. Orange, about 1/2 disk split.
Karsten Kopp Köln (Germany)	600mm (257x)	Doppelstern war erst bei 257-facher Vergrößerung sauber zu trennen. Der hellere Stern strahlt gelblich weiß und der schwächere geht ins orangenen.

STF287

7^m.4

9^m.6

6.8"

74°

2015

Ari

02^h38^m59.78^s / +14°51'37.60"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

White and wide, ~2 delta mag. Physical

★

A1279

10^m.1

2.1"

306°

2015

Per

02^h40^m25.95^s / +55°18'33.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Can just see the faint star in the 80mm finder. In the scope it is a hazy elongated smear which resolves to two equal points with seeing, 2", Very nice!

STF283

8^m.4

9^m.0

1.8"

210°

2018

Cas

02^h40^m31.92^s / +61°29'02.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Well split light orange pair, half delta mag.

STF284, V482 Cas

7^m.9

9^m.9

6.9"

190°

2018

Cas

02^h40^m44.95^s / +61°16'56.10"

7^m.9

10^m.5

53.1"

10°

2016

René Merting

Drachhausen (Germany)

100mm (64x)

AB: bei 64x zeigt sich Komponente B gut getrennt südlich von A - schönes Kontrastpaar, bestimmt 2.5 Größenklassen Helligkeitsunterschied

★

STF291

7^m.7

7^m.5

3.4"

117°

2020

Ari

02^h41^m06.59^s / +18°48'00.70"

7^m.7

9^m.5

65.5"

242°

2015

Robert Zebahl Leipzig (Germany)	70mm (57x)	AB: At 44x almost, at 57x clearly split, but still very tight with rather small difference in brightness.
Uwe Pilz Leipzig (Germany)	105mm (88x)	hellster Stern gelb, andere Farben nicht erkennbar
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: White stars, near equal, close but well split, makes a 2+1 with a ~2 delta mag, very wide C

STF295, 84 Cet

5^m.8

9^m.7

3.6"

301°

2012

Cet

02^h41^m14.00^s / -00°41'44.40"

Robert Zebahl Leipzig (Germany)	102mm (160x)	Quite easy at a moderate distance, whereby the companion appeared rather faint and was best visible with averted vision.
Uwe Pilz Leipzig (Germany)	105mm (144x)	trotz diesigem Himmel bei 144x indirekt erkennbar. Schwieriger bei 200x
Robert Zebahl Leipzig (Germany)	152mm (129x)	Easy. The quite dim companion is immediately visible in moderate distance clearly outside of the first diffraction ring despite few, high clouds. The primary component appeared white-yellowish.

HJ1123

8^m.4

8^m.5

21.1"

249°

2019

Per

02^h41^m58.44^s / +42°47'30.60"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x knapp getrennt - ein schwacher Doppelstern, der kaum auffällt im Zentrum des Sternhaufens M 34

★★

STT44

8^m.5

9^m.0

1.4"

56°

2018

Per

02^h42^m13.13^s / +42°41'57.20"

8^m.5

8^m.3

87.2"

290°

2017

Uwe Pilz Leipzig (Germany)	105mm (200x)	AB: schwierig
Robert Zebahl Leipzig (Germany)	152mm (129x)	AB: At 129x barely separable, at 150x separated quite clearly with a noticeable difference in brightness. The double star is located within Messier 34!
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: In M34 open cluster! Close near equal pair, 1.5", very nice! The cluster is pretty, loose, and jangly with stars of varying magnitudes. What a treat.

BU521

6^m.3

11^m.6

5.4"

159°

2015

Per

02^h43^m01.98^s / +48°15'54.90"

Mark McCarthy

Fremont (California/USA)

317mm (885x)

Bulging heart shape (if seen from slightly below and to the side), even at 885x, but no split. Light yellow-orange.

gamma Cet, 86 Cet, Kaffaljidhma

STF299

3^m.5

6^m.2

2.0"

299°

2015

Cet

02^h43^m18.04^s / +03°14'08.90"

ALD124

3^m.5

10^m.2

843.1"

306°

2000

René Merting Drachhausen (Germany)	100mm (142x)	AB: bei 142x wirkt der Doppelstern leicht länglich, die Beugungsscheibchen sind jetzt schon zu groß (mittleres Seeing), um sinnvoll weiter zu vergrößern
Winfried Kräling Marburg (Germany)	102mm (178x)	AB
Uwe Pilz Leipzig (Germany)	105mm (144x)	AB: extrem schwierig

★

BU306

6^m.4

10^m.4

3.0"

19°

2015

Ari

02^h43^m51.25^s / +25°38'18.00"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Very nice white and 3 delta mag bluish B, nicely seen 4".

STF300

7^m.9

8^m.1

3.1"

316°

2020

Ari

02^h44^m36.85^s / +29°27'36.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Faint but very easy 3-4" separated pair. Near equal magnitude.

BU307

7^m.1

11^m.6

16.0"

317°

2015

Ari

02^h47^m38.61^s / +29°40'42.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Faint B to WNW, wide separation, not terribly difficult.

STF301

7^m.8

8^m.7

8.2"

18°

2016

Per

02^h47^m38.75^s / +53°56'35.80"

Robert Zebahl Leipzig (Germany)	70mm (22x)	Rather faint double star with a handful of other stars in the immediate vicinity. At 22x clearly separated, but still close together with visible difference in brightness. At 31x the primary component looked slightly orange.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ganz knapp getrenntes Pärchen - Komponente B im Norden ist eine halbe Größenklasse schwächer - nett anzusehen
Sarah Gebauer Germany	100mm (45x)	bei 45x ganz knapp schon getrennt und täuscht einen Farbunterschied vor: die südwestliche Komponente wirkt leicht orange, die nordöstliche etwas bläulich

STF311, pi Ari, 42 Ari

5^m.3

8^m.0

3.3"

118°

2015

Ari

02^h49^m17.55^s / +17°27'51.50"

Robert Zebahl Leipzig (Germany)	70mm (133x)	The companion is visible as elongated, non-condensed brightening in the first diffraction ring of the primary component.
Uwe Pilz Leipzig (Germany)	105mm (144x)	sehr schwierig bei 88x, eindeutig bei 144x

STT46

6^m.8

10^m.8

4.8"

75°

2015

Ari

02^h50^m00.31^s / +30°31'34.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Yellow with very faint orangish B, PA to NE, ~5-6".

★★

eta Per, 15 Per

STF307

3^m.8

8^m.5

28.7"

301°

2018

Per

02^h50^m41.81^s / +55°53'43.80"

STF307

3^m.8

11^m.6

64.0"

269°

2014

WAL19

3^m.8

11^m.4

57.7"

25°

2013

WRD1

11^m.6

12^m.7

5.2"

116°

2015

SHJ34

3^m.8

9^m.2

242.9"

297°

2012

FYM161

11^m.6

14^m.0

15.8"

229°

2015

René Merting Drachhausen (Germany)	16x70	STF307 (AB): Miram, die Komponente A ist satt gelb und bildet ein flaches Dreieck mit zwei Sternen westlich und nordwestlich, die 1,8' und 3,9' entfernt stehen - dazwischen wird alles vom Glanz von Miram überstrahlt - im Fernglas hat B mit den eigentlich ordentlichen Daten wie Abstand 30,4" und Helligkeit 8.5 mag (andere Quellen sagen 10.7 mag) trotzdem keine Chance auf Erleuchtung
René Merting Drachhausen (Germany)	100mm (32x)	STF307 (AB): bei 32x sehr ansehnlich - Komponente B steht gut getrennt nordwestlich vom signal-gelben Eta Persei - Helligkeitsunterschied sehr groß, nicht abschätzbar
Uwe Pilz Leipzig (Germany)	105mm (88x)	Dreifachsystem, nahe Komponente: PW und Abstand stimmt, is aber viel zu dunkel (10m statt 8m5). Ein Mysterium
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF307 (AB): Orange with faint, bluish, widely separated B.

STF316

9^m.5

9^m.7

14.4"

135°

2018

Per

02^h52^m05.13^s / +37°17'45.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Wide near equal

★

A2906 & STF314

A2906

7^m.3

8^m.8

0.3"

115°

2018

Per

02^h52^m52.03^s / +52°59'50.60"

STF314

AB-C

7^m.0

7^m.3

1.6"

316°

2018

Robert Zebahl Leipzig (Germany)	152mm (129x)	STF314 (AB-C): Beautifully separated, quite close together. Difference in brightness visible, but rather small. Easy to find and bright. Very nice.
Frederik Wanink Itterbeck (Germany)	254mm (460x)	STF314 (AB-C): ähnlich hell
Mark McCarthy Fremont (California/USA)	317mm (553x)	A2906 (AB): This is the brighter of the STF 314 pair. I have a feeling it is slightly elongated but nothing certain.
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF314 (AB-C): near equal brightness, AB more yellow yellow-white of the two, ~2 disk separation

STT48

6^m.4

10^m.6

6.6"

317°

2016

Per

02^h53^m21.07^s / +48°34'11.90"

Mark McCarthy

Fremont (California/USA)

317mm (885x)

Yellow-orange with bluish round haze above it, the haze brightens with seeing and averted vision but does not resolve to point even at 885x

20 Per

BU524

5^m.8

6^m.8

0.2"

321°

2008

Per

02^h53^m42.58^s / +38°20'15.60"

STF318

AB-C

5^m.4

9^m.7

14.0"

237°

2014

STF318

AB-D

5^m.4

12^m.6

58.1"

40°

2002

René Merting Drachhausen (Germany)	100mm (64x)	AB-C: trotz großem Abstand sind 64x notwendig für die Trennung - Komponente C ist zu schwach für niedrigere Vergrößerungen, C ist vielleicht 3.5 mag schwächer als AB - jetzt bei 64x, wo C sichtbar wird, ist der Stern schon gut abgesetzt von AB erkennbar und wirkt leicht bräunlich, AB dagegen strahlt warm-weiß
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB-C: Wide 2 delta mag. no sign of elongation of BU 524, which should be the B star's pairing
Mark McCarthy Fremont (California/USA)	508mm (1067x)	AB: I suspected elongation at 667x and it was better seen at 1067x. I estimated the PA on an E-W line, though it was tough to tell which was B. This is a component of STF 318. It is currently at apastron and won't make a significant change in the coming years. 31.63 year period. Discovered with the Dearborn 18.5-inch, Burnham says: "It is at all times a difficult pair, and the motion is rapid. It is now known to be one of the most interesting binaries in the heavens. The distance never much exceeds 0.2", so that it is always a difficult pair, and beyond the reach of most telescopes."

BU1293

6^m.8

10^m.4

2.0"

349°

1991

Per

02^h54^m00.98^s / +47°09'39.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Uncertain. Seems a brightening persistent on one side of the diffraction but nothing resolves when A resolves with seeing. Poor transparency during the observation

BU525

7^m.5

0.5"

276°

2019

Ari

02^h58^m53.11^s / +21°37'03.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Star is decidedly not round but does not show shape other than a stretching.

★

STF333, eps Ari

5^m.2

5^m.6

1.5"

211°

2019

Ari

02^h59^m12.73^s / +21°20'25.60"

Uwe Pilz Leipzig (Germany)	120mm (250x)
Mark McCarthy Fremont (California/USA)	203mm (205x)	Eps Ari: Beautiful split of white stars, less than 1 delta mag, a little more than 1". Very nice pair. Physical with a 1215 year period

STT49

6^m.8

9^m.9

2.3"

50°

2008

Ari

03^h00^m31.51^s / +18°00'18.10"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

50 Ari. Very fine pair, white A and dull B, ~3 delta mag, ~2", very pretty. Physical, it has widened from 1.2" since discovery in 1865

STF331

5^m.2

6^m.2

12.0"

86°

2019

Per

03^h00^m52.18^s / +52°21'06.50"

René Merting Drachhausen (Germany)	12x42	der Stern wirkt auf den ersten Blick unförmig - in guten Momenten erkennt man eine Ameise mit mal mehr und mal weniger großer Einschnürung - Komponente B im Norden wirkt eine halbe Größenklasse schwächer
Robert Zebahl Leipzig (Germany)	63mm (46x)	Easy to separate with relatively large difference in brightness.
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein feines Pärchen, besser als knapp getrennt und richtig hell - Komponente A im Osten ist rein-weiß, B dagegen in einem eigenartigen kupfer-weiß, wenn man das so sagen kann - bei 20x passt nur noch ein dünnes Blatt Papier zwischen die beiden Sterne
Sarah Gebauer Germany	100mm (45x)	bei 45x sauber getrennt, die westliche Komponente ist etwas heller und größer, die östliche etwas schwächer und wirkt leicht bläulich
Uwe Pilz Leipzig (Germany)	105mm (150x)	einfach
Mark McCarthy Fremont (California/USA)	203mm (333x)	Slightly yellow-white pair, wide, about 1.5 delta mag

STF336

7^m.0

8^m.3

8.6"

8°

2019

Per

03^h01^m29.07^s / +32°24'45.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Nice light orange and light blue stars, 1.5 delta mag, wide, ~9"

STF337

8^m.0

9^m.3

17.6"

163°

2015

Per

03^h02^m16.79^s / +41°23'45.70"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x ein gut getrenntes Pärchen, Komponente B im SO ist deutlich schwächer, gerade so erkennbar - deshalb wirkt B auch farblos gegen die weiße Komponente A

STF341

7^m.6

10^m.0

0.0"

63°

2019

Eri

03^h03^m01.79^s / -02°05'11.20"

Uwe Pilz

Leipzig (Germany)

105mm (144x)

B nur indirekt sichtbar

../projects/double-stars/uwe-pilz/sketches/220117stf341.jpg

★

STF346, 52 Ari

6^m.2

0.5"

256°

2016

Ari

03^h05^m26.69^s / +25°15'18.70"

AB-C

5^m.5

10^m.8

5.1"

358°

2005

AB-D

5^m.5

13^m.3

102.1"

83°

2013

AB-E

5^m.5

12^m.8

133.5"

192°

2014

Mark McCarthy Fremont (California/USA)	203mm (333x)	AB: What a great set! The closest are a near equal pair of white stars, elongated with a slight notch, There's a faint C ~5" and slight more than a right angle in PA. Interesting set. Physical with 227 year period
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB-C: Bright yellow-white AB, orange C. ~4-5 delta mag, 5-6" PA to N. Did not notice AB 0.5"

ES558

7^m.7

10^m.6

8.4"

0°

2015

Per

03^h06^m47.76^s / +45°45'02.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Yellow-orange star with very faint bluish companion, 5", 2-3 delta mag.

AG61

9^m.2

9^m.4

0.5"

23°

2016

Ari

03^h06^m52.47^s / +20°51'43.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Minute pair, split at best moments, light orange stars, noticeable mag difference

BU1030

7^m.8

9^m.7

0.8"

102°

2015

Ari

03^h10^m06.57^s / +21°44'49.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Good clean split, slight magnitude difference, small pair. Really good. Physical with 571 year period

GLP1

10^m.4

10^m.7

4.5"

89°

2020

Ari

03^h10^m48.97^s / +15°08'07.50"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Faint but easy pair of white stars, near equal, well split. Physical. S. Glasenapp, active in France during the 1890s

STF360

8^m.0

8^m.3

2.7"

126°

2015

Per

03^h12^m09.59^s / +37°13'03.30"

Robert Zebahl Leipzig (Germany)	70mm (67x)	Pretty faint double star. At 57x barely separable with almost touching diffraction disks. The components seemed similarly bright. At 67x still very close together, at 100x easy to separate.
Robert Zebahl Leipzig (Germany)	152mm (69x)	Split, but close together, similarly bright. The double star appears overall slightly orange compared to the surrounding stars.

★★

STT51

8^m.5

8^m.7

0.6"

346°

2018

Per

03^h12^m57.08^s / +44°17'14.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very fine clean split at the finest moments, which is once every 10 seconds. 0.5", equal mag.

BU530

10^m.4

11^m.1

1.9"

191°

2005

Ari

03^h14^m18.93^s / +22°57'48.00"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Component of STF 366. Faint, and is mostly a hazy elongation which brightens each end with seeing --- difficult on such a night as this with poor seeing and transparency. It makes me wonder how Struve missed it? There are 26 observations in WDS so it should have been determined to be physical by now

HU544

6^m.7

8^m.2

1.7"

103°

2018

Per

03^h15^m48.70^s / +50°57'21.20"

Robert Zebahl Leipzig (Germany)	70mm (133x)	Clearly seen as figure '8' with noticeable difference in brightness.
Uwe Pilz Leipzig (Germany)	105mm (196x)	klebt am ersten Ring
Uwe Pilz Leipzig (Germany)	105mm (260x)	im ersten Ring
Robert Zebahl Leipzig (Germany)	152mm (129x)	Wonderfully separated in equally beautiful star surroundings! Clear difference in brightness visible. To the east there is a brighter star, which shines yellowish-orange. HU544 itself seems rather cool in color.

STF369

6^m.8

7^m.7

3.6"

29°

2016

Per

03^h17^m11.45^s / +40°28'58.60"

Robert Zebahl Leipzig (Germany)	70mm (57x)	At 44x still separable with noticeable difference in brightness. At 57x well separable, whereby the components are still very close together. The difference in brightness is more clearly visible here.
René Merting Drachhausen (Germany)	100mm (64x)	bei 64x knapp getrennt - Komponente B im NO wirkt eine halbe Größenklasse schwächer - beide Sterne schneeweiß
Robert Zebahl Leipzig (Germany)	152mm (100x)	Easily separable with clear difference in brightness. In terms of color, both components appeared slightly different: white-yellowish, slightly orange.

STF376

8^m.3

8^m.4

7.2"

252°

2016

Ari

03^h20^m20.64^s / +19°43'49.30"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Easy wide pair, white stars

STF375

7^m.6

9^m.9

2.7"

316°

2009

Ari

03^h20^m21.23^s / +23°41'21.90"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Easy wide pair, ~3", ~2 delta, white and bluish

STF377

8^m.8

9^m.3

1.1"

110°

2018

Ari

03^h20^m34.14^s / +19°10'49.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint in poor conditions, ~1 delta mag., ~1"

BU1294

9^m.7

10^m.3

8.7"

240°

2016

Per

03^h20^m40.58^s / +46°40'47.50"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

A is red-orange, B widely separated & light blue color, ~1 delta mag, 9th and 10th magnitudes. Not physical. Burnham discovered with the 40-inch, and said "The components are red and green"

COU259, tau 1 Ari

5^m.3

8^m.1

0.9"

217°

2016

Ari

03^h21^m13.63^s / +21°08'49.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Tau Ari. Bright, barely oval. Marginal.

★

STF379

8^m.6

8^m.8

10.4"

101°

2010

Ari

03^h22^m51.83^s / +29°49'06.30"

Christopher Hay Seeheim (Germany)	180mm (113x)	Well separated but very strongly appearing to belong together. This impression is fostered by the almost identical brightnesses and the complete lack of visual competition in 0.6° FOV. Leading star appears at first sight more orange than the other, but after a while this shifts to the other star. The pair is visually very attractive at this power, and a true physical one at 670 light years distance from us.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Very wide, near equal white stars. Physical

STF381

7^m.6

8^m.8

1.1"

109°

2018

Ari

03^h23^m19.33^s / +20°58'13.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very fine split, white and blue stars, ~1 delta mag, ~1"

STF383

8^m.5

9^m.1

5.5"

121°

2020

Ari

03^h24^m14.32^s / +17°32'58.50"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Wide, >1 delta mag, light orange A and almost blue B

TOK13, UX Ari

6^m.6

10^m.0

95.6"

129°

2014

Ari

03^h26^m35.36^s / +28°42'55.20"

Mark McCarthy Fremont (California/USA)	152mm (175x)	UX Ari. Light orange A and wide, 3 delta mag B. Spectral class G5IV-V (yellow). WDS claims physical, however they do not share their parallax ranges (-27%) and the weighted separation (4,893 AU) is very far for the light mass 1.60/0.75 -- they are not binary
Mark McCarthy Fremont (California/USA)	317mm (270x)	UX Ari: Orange star with very faint wide blue B

A2345

9^m.7

10^m.6

1.1"

176°

2013

Tau

03^h27^m32.03^s / +19°11'13.40"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

The faint companion is just split with seeing, around 1 delta mag, very tight <1". Physical with a 959-year period. The PA is currently precisely to the south

★

STF388

8^m.0

9^m.0

2.8"

214°

2018

Per

03^h28^m40.39^s / +50°26'10.80"

René Merting Drachhausen (Germany)	100mm (107x)	bei 107x zeigt sich Komponente B südlich von A und nur in guten Momenten sind beide Sterne knapp getrennt zu sehen
Mark McCarthy Fremont (California/USA)	317mm (553x)	Pretty blue and a little red pair, 1.5 delta mag. On the northern edge of Stock 1.

STF391

7^m.6

8^m.3

3.9"

96°

2018

Per

03^h29^m13.74^s / +45°02'57.50"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Clearly split, but close together, moderate difference in brightness. The double star is located in a very beautiful star field with some of the stars appearing colored, but this only came into its own at low magnification.
Robert Zebahl Leipzig (Germany)	152mm (69x)	Easy to separate with moderate difference in brightness. Slight difference in color: white-yellowish, slightly orange.

BU1179, 34 Per

4^m.7

7^m.3

0.6"

141°

2016

Per

03^h29^m22.05^s / +49°30'32.20"

Mark McCarthy Fremont (California/USA)	317mm (885x)	Uncertain but can't resolve even at 885x
Mark McCarthy Fremont (California/USA)	508mm (333x)	34 Per. B is the faintest, smallest dot separated from bright white A, extremely fine. Burnham discovered with the 36-inch at 0.7" and described it as a "difficult pair"

STT55

6^m.2

11^m.4

31.1"

295°

2007

Per

03^h29^m26.28^s / +46°56'16.30"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Bright white A and a tiny fleck of star for B, well separated and large delta mag. Not physical

ES2599

10^m.0

10^m.2

19.2"

299°

2015

Per

03^h29^m46.98^s / +50°01'05.10"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Wide equal white pair of 9th magnitude stars, physical. Aa-Ab is a close Cocteau pair I could try with my 20-inch on a better night

STF343

8^m.4

9^m.8

35.3"

327°

2015

Cep

03^h29^m50.94^s / +84°02'19.70"

8^m.4

12^m.9

90.5"

309°

2015

René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 32x sind zwei schwache Sterne mit ordentlichem Abstand erkennbar - Komponente B ist eine Größenklasse schwächer und leicht grau-braun - zurück auf 20x ist B noch gerade so zu erkennen und wirkt nun etwas weißer
René Merting Drachhausen (Germany)	320mm (72x)	AB: bei 72x üppig getrennt, ein Pärchen mit schönem Farbkontrast, Komponente A strahlt weiß, B orangebraun AC: bei 72x ist nordwestlich über AB in dreifacher Entfernung Komponente C zu erkennen - C ist nochmal deutlich schwächer als B

STF389

6^m.4

7^m.9

2.6"

72°

2018

Cam

03^h30^m10.93^s / +59°21'57.80"

Uwe Pilz Leipzig (Germany)	60mm (198x)	Ein Hauch mit einem Abstand von 0,4 Beugungsscheibendurchmesser, sehr schwierig. Einfach bei 105mm
Robert Zebahl Leipzig (Germany)	70mm (133x)	Easy to find and separated at 67x, but very tight. Easily separable at 133x, still relatively tight together with significant difference in brightness.

HLD8

9^m.4

9^m.8

2.4"

177°

2018

Per

03^h30^m34.67^s / +49°47'21.20"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Fine pair, slight magnitude difference, nicely split ~3", appears closely split at this magnification

STFA7

7^m.4

7^m.8

44.1"

234°

2017

Tau

03^h31^m03.47^s / +27°43'53.60"

Christopher Hay Seeheim (Germany)	71mm (13x)	Well separated. Northern component seems slightly brighter.
Mark McCarthy Fremont (California/USA)	80mm (13x)	Nice finder split, equal mag but faint, ~8th mag.
Uwe Pilz Leipzig (Germany)	105mm (21x)	gleichhell, einfach
Robert Zebahl Leipzig (Germany)	120mm (18x)	Well split with noticeable difference in brightness. Nice view together with the double star STF401 located southeast.

STF403

8^m.7

8^m.9

2.3"

173°

2018

Tau

03^h31^m13.43^s / +19°47'00.30"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Only a slight but noticeable magnitude difference, fairly tight separation approximately 3", white stars

★★

STF401

6^m.6

6^m.9

11.5"

270°

2020

Tau

03^h31^m20.76^s / +27°34'18.50"

Christopher Hay Seeheim (Germany)	18x80	Cleanly split. Supplemented nicely by the wide pair STFA7 directly north, in very star-poor surroundings in 4° FOV.
Christopher Hay Seeheim (Germany)	71mm (13x)	Just separated.
Uwe Pilz Leipzig (Germany)	105mm (21x)	ein Hauch schwärze dazwischen
Robert Zebahl Leipzig (Germany)	120mm (18x)	Barely split at 18x. At 40x difference in brightness is visible. Nice view together with the double star STFA7 located northwest.
Christopher Hay Seeheim (Germany)	180mm (113x)	Very wide separation. Southern component slightly towards orange compared to the northern one, which is slightly towards blue. Very attractive in 0.6° FOV with STFA7. A physical pair at 318 light years distance from us.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Slight magnitude difference, brilliant white stars, with another slightly fainter and much wider pair in the field (this is SHY 445 BC). Physical
Mark McCarthy Fremont (California/USA)	317mm (553x)	Near equal white ~7", nice, W-E. Forms a double-double in wider FOV with STF 375.

ES560

8^m.3

11^m.3

9.5"

142°

2015

Per

03^h33^m13.49^s / +46°15'26.50"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

A fine pair, white A and three delta mag dull B, wide. Physical. There appears to be a stream of faint stars to the side of this star in the field of view, and also visible in the finder -- this star is on the southern edge of open cluster Mel 20, so it is a rich area

HO14

9^m.7

10^m.0

2.2"

26°

2018

Tau

03^h33^m14.30^s / +28°16'30.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very fine pair, half delta mag, around 2", faint but still direct vision

STT57

7^m.7

12^m.0

10.0"

321°

2017

Tau

03^h33^m26.53^s / +23°23'03.50"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Part of a wide bright pair (AB), this is a large delta mag, pretty wide, attractive pair

STF396

6^m.4

7^m.7

20.5"

245°

2019

Cam

03^h33^m32.19^s / +58°45'55.30"

René Merting

Drachhausen (Germany)

18x70

in diesem FG ein schönes enges (knapp getrenntes) Paar - B steht südwestlich - weil beide Sterne so eng stehen, ist der Helligkeitsunterschied schwer abschätzbar, ich denke 1 bis 1.5 Größenklassen

ES561

9^m.1

10^m.3

8.1"

39°

2015

Per

03^h33^m33.18^s / +45°45'12.50"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Wide one delta mag white stars, nice. Physical

SMA37

9^m.5

10^m.8

31.6"

288°

2015

Per

03^h33^m52.18^s / +43°51'01.90"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Wide ~1 delta mag pair. A has a fainter companion, closer by half of B's distance, slightly askew in PA -- this is the AC pair

BU787

7^m.4

11^m.9

5.2"

293°

2016

Per

03^h34^m12.97^s / +48°37'02.90"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Very nice, white and very large delta mag B, but seen plainly with low magnification. Physical, 655.8 year period

★★★

STF412, 7 Tau

6^m.6

6^m.9

0.8"

351°

2019

Tau

03^h34^m26.62^s / +24°27'52.10"

AB-C

5^m.9

9^m.9

22.4"

53°

2014

Uwe Pilz Leipzig (Germany)	105mm (260x)	AB: A-B länglich
Christopher Hay Seeheim (Germany)	180mm (110x)	No definite elongation of AB seen at 110x, seeing is poor. But nice pinprick of light wide off to NE, seems bluish, this is the C component. AB-C is physical at 429 light years distance from us, and so is A-B, so this is a physical triple system. Very easy to find 3° due west of the Pleiades.
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: Exciting 2+1 set. AB is brilliant near equal white, nice close split <1". C is a much fainter wider star. I also cleanly split AB with the 8-inch mask, but the dark gap was narrower. Physical with a 522.16-year period

STF414

8^m.2

8^m.3

7.5"

187°

2018

Tau

03^h34^m27.73^s / +19°47'52.40"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Near equal white pair, well split. Physical

STF415

8^m.8

10^m.9

15.1"

53°

2015

Tau

03^h35^m20.40^s / +26°51'00.70"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very wide B, faint pair, almost 2 delta mag.

BU533

7^m.5

7^m.7

1.0"

222°

2018

Per

03^h35^m37.81^s / +31°40'48.70"

Robert Zebahl Leipzig (Germany)	152mm (225x)	At 129x clearly elongated, notched. At 225x just so separable with similarly bright components.
Mark McCarthy Fremont (California/USA)	152mm (285x)	Excellent! Near equal light yellow-orange stars, hairline at 175x and close clean split at 285x. Burnham discovered with the 18.5-inch Dearborn refractor at 0.4". WDS has medium confidence of binarity with a 463-year period, currently coming off apastron. However there is no shared parallax range (-12%), despite only 103 AU weighted separation and 1.63/1.68 Msol. This may turn out not to be binary

STF420

8^m.7

11^m.0

6.7"

113°

2016

Tau

03^h36^m29.66^s / +23°54'45.50"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Almost 3 delta mag, well split, light yellow stars

HU102

9^m.7

11^m.1

3.2"

64°

2001

Per

03^h36^m42.80^s / +48°39'05.40"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Very fine, ~2 delta mag, very closely but well split ~3", very nice

PAT1

7^m.8

10^m.4

0.5"

233°

2019

Tau

03^h37^m34.98^s / +21°20'35.40"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Listed in SkyTools as a 9th magnitude pair but no magnitude given for B. I only see it as single. No wonder, as WDS's note is B is visible in infrared K-band. Discovered by Patience, J., Ghez, A.M., Reid, I., published in the late 1990s

HLD9

9^m.6

9^m.8

1.3"

55°

2018

Per

03^h37^m43.01^s / +48°07'02.50"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Faint, nearly 10th magnitude stars. This pair is very tough this aperture and magnification, very finely hairline split, very noticeable delta magnitude. A very faint ~10th magnitude tumbling satellite moved slowly through through the side of the FOV

★★

S430

7^m.2

7^m.5

41.0"

96°

2017

Per

03^h38^m18.83^s / +44°48'06.50"

Christopher Hay Seeheim (Germany)	7x50	On tripod. Well separated. A evidently brighter than B. A appears to tend towards orange, B rather towards blue. Most of the Alpha-Persei cluster can be viewed together with S430 in 7.2° FOV. Seen thus, S430 feels likes a distant little echo of the powerfully orange-blue pair Sigma Per in the cluster. South 430 is a physical double at a distance to us of 498 light years.
Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. AB widely separated, greater brightness of A is distinct. The colour hues that were uncertain in 7x50 are now clearer. Colours confirmed in 15x60 on tripod.
Robert Zebahl Leipzig (Germany)	16x70	2020-11-07: Easily separated at moderate separation, nearly equal in brightness. White-yellowish & white-bluish.
René Merting Drachhausen (Germany)	16x70	ein schöner Fernglas-Stern - beide Komponenten sind hell genug und stehen weit genug auseinander - sie sind mehr als ordentlich getrennt - die B-Komponente im Osten wirkt ein bisschen wärmer im Farbton

A2420

9^m.3

10^m.2

2.0"

268°

2017

Tau

03^h38^m25.78^s / +17°35'57.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very fine because of its faintness. approximately 1 delta mag, 2". I'm surprised I could get it, the clean disks and contrast of the aperture mask helps

STF424

8^m.9

11^m.5

10.1"

313°

2015

Tau

03^h39^m10.83^s / +27°57'23.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Transparency hurting the view, but I can still see the faint pair, wide, ~1 delta mag. Physical

STTA36

A-BC

6^m.9

8^m.3

45.9"

72°

2019

Cam

03^h39^m58.81^s / +63°52'13.40"

René Merting

Drachhausen (Germany)

18x70

ein mehr als gut getrenntes Pärchen mit einem leichten Farbkontrast - Komponente B im Westen ist gut eine Größenklasse schwächer und wirkt graublau - A hat sich wie meist gut die Zähne geputzt, strahlend weiß - übrigens auch ein schöner Kontrast mit dem ebenfalls im Gesichtsfeld stehenden etwas mehr als 1° südlich befindlichen Stern U Cam, der knallig orange strahlt

STF425

7^m.5

7^m.6

1.9"

59°

2018

Per

03^h40^m07.24^s / +34°06'59.30"

Robert Zebahl

Leipzig (Germany)

152mm (129x)

Beautifully separated, relatively close together, very little difference in brightness.

STF427, V1268 Tau

7^m.4

7^m.8

7.0"

207°

2020

Tau

03^h40^m38.77^s / +28°46'24.00"

Mark McCarthy Fremont (California/USA)	80mm (13x)	V1268: Wide near equal orange in finder. Loses its color when viewed in the scope under high magnification.
Robert Zebahl Leipzig (Germany)	120mm (40x)	At 40x barely split. At 75x easily split with visible difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Nice airy disks, slightly blue-white, wide, around 1 delta mag. Physical.
Mark McCarthy Fremont (California/USA)	317mm (270x)	Near equal mag, white and fainter B is yellow, well split.

STT59

7^m.9

8^m.8

2.8"

356°

2018

Per

03^h40^m40.62^s / +46°01'24.10"

Robert Zebahl Leipzig (Germany)	70mm (67x)	Already separable at 67x, but very tight. Easy to separate at higher magnification. Difference in brightness clearly visible.
Robert Zebahl Leipzig (Germany)	152mm (100x)	Nicely separated, but close together. Primary component appears rather whitish, companion darker with a hint of orange.
Mark McCarthy Fremont (California/USA)	203mm (121x)	Sharp pair, A is a very light yellow-white, B is more yellow, nearly 2 delta mag, ~3", very nice

STF431, 40 Per

5^m.0

10^m.0

19.8"

244°

2010

Per

03^h42^m22.64^s / +33°57'54.10"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

Wide, 2 delta mag, white-yellow and very faintly blue

A987

10^m.2

10^m.4

1.1"

190°

2016

Tau

03^h42^m27.88^s / +29°45'50.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Exceptionally fine pair, faint, significant delta mag, around 1"

WEB2

5^m.7

13^m.8

23.4"

98°

2011

Cam

03^h42^m42.73^s / +59°58'09.80"

5^m.7

13^m.0

34.5"

303°

2011

5^m.7

8^m.4

54.8"

37°

2019

5^m.9

11^m.8

168.4"

162°

2003

René Merting

Drachhausen (Germany)

18x70

AD: ein komfortabel getrenntes sehr ungleiches Paar - Komponente A im Südwesten ist hell und cremegelb - Komponente D muss mindestens 3 Größenklassen schwächer sein und wirkt dadurch wie eine graue Maus

STF419

7^m.8

2.9"

73°

2018

Cam

03^h42^m45.19^s / +69°50'44.30"

Robert Zebahl

Leipzig (Germany)

70mm (67x)

Separated, but tight with equally bright components. Beautiful sight.

STF435

7^m.2

8^m.9

13.2"

3°

2015

Tau

03^h43^m06.52^s / +25°40'52.90"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Very wide, >1 delta mag. Physical
Mark McCarthy Fremont (California/USA)	317mm (553x)	Wide orange and blue, 2 delta mag. Nice big orange finder split 1 degree to the north from here, one of which has a faint wide pair when viewed through the telescope.

A989

9^m.8

10^m.4

3.2"

357°

2016

Tau

03^h43^m27.49^s / +29°35'35.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint but easy pair, near equal, approximately 3"

HJL1024

8^m.0

9^m.6

196.7"

175°

2015

Tau

03^h43^m41.53^s / +23°38'56.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very wide faint companion, ~3 delta mag.

★

STF434

7^m.8

8^m.3

33.7"

83°

2019

Per

03^h43^m58.92^s / +38°22'25.60"

7^m.8

13^m.6

91.9"

350°

2015

Robert Zebahl Leipzig (Germany)	16x70	AB: 2020-11-07: Beautiful sight! Nice separation and color contrast: vivid orange & subtle blue.
Robert Zebahl Leipzig (Germany)	102mm (28x)	AB: 2020-11-08: Easy to separate, beautiful sight! Light orange & light blue.

STF437

9^m.8

10^m.0

11.2"

310°

2015

Per

03^h44^m09.15^s / +32°07'09.30"

Uwe Pilz Leipzig (Germany)	105mm (88x)	einfach
Uwe Pilz Leipzig (Germany)	120mm (180x)

★★

BU535, omicron Per, 38 Per, Atik

3^m.9

6^m.7

1.1"

20°

2015

Per

03^h44^m19.13^s / +32°17'17.70"

Uwe Pilz Leipzig (Germany)	105mm (88x)	=omikron Per, in IC348, lohnend!
Mark McCarthy Fremont (California/USA)	152mm (285x)	Strong sense of out of roundness at all powers, but not certain. Burnham discovered with the 18.5-inch at 1.0". WDS uncertain, and I don't find Gaia data for the secondary
Robert Zebahl Leipzig (Germany)	152mm (300x)	In steady moments the faint companion is clearly recognizable as a small brightening in the first diffraction ring of the primary component.
Mark McCarthy Fremont (California/USA)	317mm (270x)	No split at 270x

HU103

8^m.7

8^m.9

1.2"

203°

2018

Per

03^h45^m22.61^s / +49°51'42.40"

Robert Zebahl Leipzig (Germany)	152mm (225x)	At 100x slightly elongated, at 129x elongated, notched. At 225x clearly separated, but tight with little difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Elongated with 121x, strongly notched overlapping disks with 205x, significant magnitude difference. Seeing doesn't support higher powers

STF444

6^m.9

10^m.1

3.4"

338°

2018

Tau

03^h45^m48.82^s / +23°08'49.70"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very pretty unequal pair, A is blue-white and B a little red, wide. Physical

ES465

9^m.5

10^m.0

9.9"

266°

2015

Per

03^h45^m54.74^s / +50°25'09.20"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Typical Espin, wide, ~1 delta mag. Not physical

★★

BU536 & S437, SAO76169

S437

AB-C

8^m.1

7^m.7

38.8"

308°

2017

Tau

03^h46^m16.00^s / +24°11'23.50"

BU536

8^m.1

9^m.4

1.1"

178°

2016

BU536

7^m.7

12^m.9

18.3"

5°

2015

Christopher Hay Seeheim (Germany)	10x42	S437 AB-C: A fine, compact pair at the centre of the Pleiades. Not physical, in contrast to AB.
Christopher Hay Seeheim (Germany)	71mm (13x)	S437 AB-C: Well separated. The most double-starish pair in the whole of the Pleiades at this power.
Christopher Hay Seeheim (Germany)	76mm (20x)	S437 AB-C: Well separated. Component C is slightly orange.
Christopher Hay Seeheim (Germany)	180mm (200x)	BU 536: AB seems to plop apart in good moments, but remains uncertain. S437 AB-C: C is brown-orange, AB blue-white.
Mark McCarthy Fremont (California/USA)	203mm (333x)	BU536 (AB): Wow what a great pair. B is a clean split ~1" right next to A, approximately 1 delta. More amazing to see than I can describe. Aitken had a measure of 0.15" in 1899.70. Burnham discovered with the 18.5-inch at 0.4" and notes "It is important that the close pair should be watched and measured in the near future." Physical, 885.64 year period, now widening

STF443

8^m.2

8^m.8

6.7"

56°

2020

Per

03^h47^m02.11^s / +41°25'38.10"

8^m.2

11^m.4

106.2"

331°

2002

Robert Zebahl

Leipzig (Germany)

102mm (28x)

AB: 2020-11-08: Nicely separated, relatively close together with little difference in brightness.

STF450

7^m.3

9^m.4

5.7"

263°

2020

Tau

03^h47^m24.41^s / +23°54'52.80"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Pretty blue-white A and lightly red B pair, wide, large delta mag ~3
Mark McCarthy Fremont (California/USA)	317mm (553x)	Easy yellow-blue 5" 1.5 delta mag.

STF448

6^m.7

9^m.4

3.5"

13°

2016

Per

03^h47^m52.66^s / +33°35'59.50"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

2 delta mag 5" separated white and a little green-blue B

LOH1

10^m.0

11^m.5

9.3"

132°

2015

Tau

03^h48^m08.14^s / +22°33'32.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint pair, slight delta between them, well separated. One of the base stars forming a pointed triangle. This is Wilhelm Oswald Lohse's one and only double star discovery, Publications of the Observatory of Potsdam 20, #58, 1908. He has craters on both the moon and Mars named for him

STT63

6^m.2

11^m.2

6.7"

269°

2016

Per

03^h48^m18.08^s / +50°44'12.40"

Mark McCarthy Fremont (California/USA)	203mm (121x)	Very bright white A and very much fainter B, which appears direct vision with best focus and brightens with averted vision and foveal coaxing. A challenge for this aperture
Mark McCarthy Fremont (California/USA)	317mm (553x)	Nice white disk with slightly blue haze 6" out but not resolved to point due to poor transparency.

BU1105

9^m.3

10^m.4

0.2"

114°

2010

Tau

03^h48^m34.80^s / +24°10'52.20"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

I see the slightest bump on side of A, very much fainter. I disabled tracking to record my impression of the position angle, which I had to the ESE, and find this is correct. Visible only with apodising mask and with seeing. WDS is uncertain whether it is binary, but there are only 6 observations. In the Pleiades, Burnham discovered with the 36-inch at 0.3" and described it as a "difficult pair."

STF453, 27 Tau

Aa-Ab

3^m.8

6^m.8

0.5"

40°

1929

Tau

03^h49^m09.73^s / +24°03'12.70"

Mark McCarthy

Fremont (California/USA)

178mm (533x)

I see an out of roundness in the A star, bright white. There are many more pairings, many HLs (Asaph Hall)

HU209

9^m.3

10^m.4

1.4"

107°

2016

Per

03^h49^m13.09^s / +50°23'17.40"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Elongated to very fine small scale near equal snowman with 121x, elongated more with 205x, with hairline split at moments of best seeing, ~1 delta mag

STF446

6^m.9

9^m.9

8.8"

254°

2015

Per

03^h49^m27.57^s / +52°39'19.40"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

~2 delta mag, wide, nice pair

HU1067, XY Per

9^m.7

10^m.6

1.3"

77°

2015

Per

03^h49^m36.35^s / +38°58'55.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Light orange star, small, definitely elongated at 553x. Seems to resolve in best moments to a very faint B star, but uncertain. Very faint in the finder, at its limit.

STT64

6^m.8

10^m.2

3.3"

235°

2014

Tau

03^h49^m58.06^s / +23°50'55.30"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Significantly fainter ~4 delta mag B, wide, it's a tiny white dot to bright white A
Mark McCarthy Fremont (California/USA)	317mm (270x)	Light orange star with 3-4 delta mag, ~3" separated companion, white

STT65

5^m.7

6^m.5

0.4"

202°

2017

Tau

03^h50^m18.91^s / +25°34'46.70"

Mark McCarthy Fremont (California/USA)	178mm (333x)	Notched snowman, B is a little bluish to white A, can tell orientation, short period with PA to the SW. 61.2-year period, it will soon be at apastron. Given it's nearly edge-on orbit, I won't see significant change, except for a slightly better split, in my time
Mark McCarthy Fremont (California/USA)	203mm (533x)	For this one I used an 8-inch mask on my 20-inch telescope, since the star brightness washed out the image in full aperture. It appeared as a very tight pair, hairline split, and around 1 delta mag. I estimated the PA to the south. Approaching apastron, and won't make significant change in my lifetime in spite of the 61.2-year period

STF457

9^m.3

9^m.4

0.7"

91°

2018

Tau

03^h50^m19.66^s / +22°40'41.60"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very finely split at 205x, better split, but more dependent on seeing, with 333x. Equal pair, faint

GRV195

8^m.0

11^m.1

60.8"

330°

2014

Tau

03^h51^m20.24^s / +26°21'13.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Wide separation, 2 delta mag. Did not see elongation in A for A1830AB

HEI9

9^m.3

10^m.4

4.3"

282°

2018

Tau

03^h51^m21.55^s / +25°38'07.40"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

B flashes with averted vision, pretty close to white A, around 3" separation

STT66

8^m.1

8^m.5

1.0"

146°

2018

Per

03^h52^m04.69^s / +40°47'50.70"

Robert Zebahl Leipzig (Germany)	102mm (187x)	2020-11-08: Already at 125x visible as figure '8'. Seeing was not good enough for higher magnifications.
Mark McCarthy Fremont (California/USA)	317mm (270x)	light orange equal magnitude, split with seeing, close ~1"

HJ3253

8^m.1

9^m.7

31.9"

73°

2015

Tau

03^h52^m10.39^s / +26°13'53.00"

René Merting

Drachhausen (Germany)

18x70

Komponente B zeigt sich schwach aber gut getrennt östlich von A - mindestens 1.5 Größenklassen Helligkeitsunterschied

STF464, zeta Per, 44 Per

2^m.9

9^m.2

12.9"

209°

2012

Per

03^h54^m07.92^s / +31°53'01.20"

2^m.9

11^m.2

33.3"

286°

2012

2^m.9

10^m.4

98.6"

195°

2012

2^m.9

10^m.0

120.0"

186°

2012

Robert Zebahl Leipzig (Germany)	102mm (106x)	AB: Easy to separate, but the B component appeared only as a very faint, tiny companion.
Mark McCarthy Fremont (California/USA)	152mm (175x)	AB: Really nice. With the refractor, the bright primary star does not flare too much and the very faint B hangs outside the diffraction, a firm fine point. WDS claims physical, and there is 56% parallax range overlap, 3,450 AU weighted separation, and a heavy 8.15/1.93 Msol
Mark McCarthy Fremont (California/USA)	317mm (270x)	AB: Triple system, 2 very faint stars nearby. Did not see BU 535 1.1" 3 delta mag, the second star I saw not in system

★★★

STF470, 32 Eri

4^m.8

5^m.9

6.9"

349°

2019

Eri

03^h54^m17.49^s / -02°57'17.00"

Robert Zebahl Leipzig (Germany)	55mm (27x)	At 27x split, but still tight with noticeable difference in brightness. A slight difference in colors could be seen. At 56x the color difference was very evident: The brighter component appeared slightly yellowish, the fainter one slightly bluish. Highly recommended! The sketch was done few days later during another observation.
Uwe Pilz Leipzig (Germany)	105mm (144x)	ab 26x trennbar
Uwe Pilz Leipzig (Germany)	105mm (288x)	Farbkontrast, gelborange-blauweiß

BU85

8^m.0

9^m.9

4.0"

217°

2017

Tau

03^h55^m26.06^s / +17°37'57.60"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very faint B can be seen directly, around 4". Discovered with 6-inch. Not physical

STF462

10^m.7

11^m.6

8.1"

320°

2016

Per

03^h55^m46.11^s / +52°22'07.60"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Strikingly faint for a Struve, wide, ~1 delta mag

★

KU16

10^m.5

11^m.2

2.4"

268°

2015

Per

03^h56^m18.22^s / +51°07'58.70"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Wow! Very fine pair, slight mag difference, faint ~10th magnitude, well split B resolves with seeing

STF465

8^m.1

10^m.0

5.7"

236°

2018

Per

03^h56^m40.78^s / +47°28'59.90"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Off-white stars, >1 delta mag, pretty wide. Physical

STF469

6^m.9

9^m.9

8.8"

146°

2015

Per

03^h57^m16.29^s / +41°52'50.30"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

White and slightly red B, wide, ~3 delta mag

STF471, epsilon Per, 45 Per

2^m.9

8^m.9

9.1"

10°

2015

Per

03^h57^m51.22^s / +40°00'36.90"

Robert Zebahl Leipzig (Germany)	63mm (46x)	Easy to separate, but much fainter, second component, which appears as a small, faint spot. Nice view.
Uwe Pilz Leipzig (Germany)	105mm (144x)
Mark McCarthy Fremont (California/USA)	203mm (121x)	Very bright white A, and B is far enough away and just the right blue-green color to look like a planet

ES878

7^m.9

11^m.1

12.2"

226°

2015

Per

03^h58^m51.30^s / +51°29'56.50"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Light orange A, B is very faint, a fleck of light, well separated

STT68, IQ Per

7^m.8

9^m.2

39.1"

176°

2015

Per

03^h59^m44.66^s / +48°09'04.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Pretty, close split in 80mm finder. Nice & wide 1 delta mag in scope. Is IQ Per

MLB639

8^m.1

9^m.7

8.1"

267°

2018

Tau

04^h00^m05.00^s / +27°33'18.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

B barely seen direct, flashes with averted vision. Very light orange A. Not physical

STF479

6^m.9

7^m.8

7.5"

126°

2020

Tau

04^h00^m56.81^s / +23°12'05.40"

6^m.9

9^m.4

57.8"

243°

2019

Robert Zebahl Leipzig (Germany)	102mm (28x)	Components A & B clearly separated with visible difference in brightness. Noticeably fainter component C much wider apart. All three components form an obtuse triangle.
Robert Zebahl Leipzig (Germany)	152mm (49x)	Nice view. All three components easy to separate. A: white-yellowish; B: creamy white.
Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: White stars, around 1 delta, wide
Robert Zebahl Leipzig (Germany)	200mm (37x)	AB: Nice, evident double star, easy to split. Slight difference in brightness.
Mark McCarthy Fremont (California/USA)	317mm (207x)	AB: Wide separation but closer than the AC, about half a delta mag.
Mark McCarthy Fremont (California/USA)	317mm (207x)	AC: 2x fainter than A star, and much wider than AB separation.

STF476

8^m.0

9^m.2

25.9"

289°

2015

Per

04^h01^m34.83^s / +38°39'55.80"

9^m.2

13^m.1

69.7"

210°

2015

Robert Zebahl

Leipzig (Germany)

16x70

AB: 2020-11-07: Easy to split at moderate distance and clear difference in brightness. Companion well visible as a tiny star. Primary component appears slightly orange.

STF477

8^m.5

9^m.4

3.1"

212°

2018

Per

04^h02^m04.77^s / +41°50'56.70"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Very fine white pair, ~1 delta mag. Very close but nicely separated white stars. Not physical

STF481

7^m.5

9^m.6

2.7"

106°

2015

Tau

04^h02^m14.87^s / +28°07'35.00"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

B is faint but easily seen and steady, white A, around 3 delta mag, wide

★

HLD10

9^m.4

10^m.8

4.2"

91°

2018

Per

04^h02^m27.53^s / +48°23'43.10"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

Wow! good one. ~2 delta mag, ~4", very fine B. Nice pair -- but not physical!

STF483

7^m.4

9^m.3

1.6"

53°

2018

Per

04^h04^m07.10^s / +39°30'35.00"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

Yellow-orange star, very close, 1", 2 delta mag.

ES466

9^m.5

12^m.5

4.3"

54°

2016

Per

04^h04^m08.38^s / +49°48'52.60"

Mark McCarthy

Fremont (California/USA)

203mm (121x)

A challenge with this aperture and magnification. White A, B appears with averted vision only, well separated, just faint

STT558, 37 Tau

4^m.5

10^m.0

135.0"

194°

2013

Tau

04^h04^m41.71^s / +22°04'54.90"

Mark McCarthy

Fremont (California/USA)

317mm (207x)

37 Tau: Orange star with much fainter wide pair

BU1005

9^m.2

12^m.4

2.6"

62°

1971

Tau

04^h06^m45.11^s / +28°55'54.70"

Sarah Gebauer

Germany

100mm (200x)

nicht zu trennen (starke Helligkeit der Hauptkomponente kombiniert mit geringer Distanz und Amiciprisma wohl ursächlich)

STT531, 50 Per

7^m.3

9^m.7

2.7"

353°

2018

Per

04^h07^m34.35^s / +38°04'28.30"

7^m.3

8^m.8

225.1"

217°

2015

Robert Zebahl Leipzig (Germany)	102mm (125x)	AB: 2020-11-08: Clearly separated, relatively tight, fairly large difference in brightness. Primary component appeared white-yellowish with faint companion.
Mark McCarthy Fremont (California/USA)	317mm (270x)	AB: AC is a finder split. The fainter of these has another star split 4", 2-3 delta mag., this is the AB pair.

STF495

6^m.1

8^m.8

3.8"

224°

2015

Tau

04^h07^m41.98^s / +15°09'46.10"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

White A, around 3 delta mag B, around 3" separation. OCC9088 Aa-Ab is 6.20/7.80 1.6", not seen

STF485, SZ Cam

6^m.9

18.0"

306°

2018

Cam

04^h07^m51.38^s / +62°19'48.40"

Robert Zebahl Leipzig (Germany)	8x40	Split, but very tight with equally bright components. I used a tripod.
René Merting Drachhausen (Germany)	18x70	die beiden hellen Sterne im OS 1502 - knapp getrennt, gleich hell - es würde noch genau solch ein heller Stern zwischen die beiden passen
Robert Zebahl Leipzig (Germany)	70mm (15x)	Easily split with nearly equally bright components. Located in the center of the open cluster NGC1502. Very nice view.

STT72

6^m.1

9^m.7

4.7"

328°

2015

Tau

04^h07^m59.42^s / +17°20'23.60"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very light orange A, and very faint B, need foveal coaxing to hold it direct, around 4"

BU309

7^m.8

11^m.0

5.7"

280°

2016

Tau

04^h08^m20.64^s / +19°44'15.50"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

White star A and very much fainter B, seen direct barely, around 4"

★

STF494

7^m.5

7^m.7

5.2"

188°

2020

Tau

04^h08^m53.50^s / +23°05'55.10"

Robert Zebahl Leipzig (Germany)	102mm (62x)	At 28x separated, but very tight, similarly bright, both whitish. At 62x easy to separate, little difference in brightness and color: slightly orange; white-bluish. Color impression slightly more intense at 86x.
Robert Zebahl Leipzig (Germany)	152mm (49x)	Easy to separate at 49x with subtle color differences: slightly orange; white-bluish. Color impression slightly more intense at 100x. Beautiful sight.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Near equal white stars, well separated

STF3114

7^m.7

9^m.6

3.1"

157°

2018

Per

04^h09^m10.26^s / +40°09'40.50"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

Pretty light yellow star with 2 delta mag orangish B, ~3"

STF500

8^m.8

10^m.7

4.0"

79°

2018

Per

04^h11^m41.62^s / +40°15'54.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

1 delta mag, ~4", very hazy.

★

omicron 2 Eri, 40 Eri, STF518

A-BC

4^m.4

9^m.3

82.7"

102°

2019

Eri

04^h15^m16.32^s / -07°39'10.30"

9^m.5

11^m.2

8.2"

330°

2019

Winfried Kräling Marburg (Germany)	102mm (178x)
Uwe Pilz Leipzig (Germany)	105mm (244x)	A ist gelblich. B fiel sofort ins Auge, auch bei 144x. C war extrem schwierig. A musste außerhalb des Gesichtsfeldes stehen, aber auch dann war er nur indirekt sichtbar. Dann aber überraschte der verhältnismäßig große Abstand B-C. ~ A ist ein Hauptreihenstern ähnlich der Sonne. B ist ein weißer Zwerg, einer der hellsten am Himmel. C ist ein Roter Zwerg, davon gibt es nicht viele in der Reichweite kleiner Instrumente. Insgesamt hat man drei Zwergsterne auf einen Blick: Einen gewöhnlichen (=Hauptreihen-) Zwerg, einen weißen und einen roten.

Berthold Fuchs

Wiesbaden (Germany)

130mm

A-BC: Triplesystem with a white Dwarf

../projects/double-stars/berthold-fuchs/photographs/Keid.png

STTA45, V774 Tau

6^m.4

7^m.0

63.7"

316°

2017

Tau

04^h15^m28.86^s / +06°11'13.60"

René Merting

Drachhausen (Germany)

12x42

ein schickes Sternpaar - Komponente B steht in einigem Abstand nordwestlich von A - leichter Farbkontrast, A leicht gelblich, B wirkt schmutzig braunweiß

HO328

7^m.4

9^m.1

0.4"

358°

2016

Tau

04^h17^m01.22^s / +19°40'32.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very faint, very close ~0.8", emerges with seeing, hair split. Marginal

LDS5535

5^m.0

9^m.6

179.9"

118°

2015

Tau

04^h17^m15.69^s / +20°34'43.50"

Mark McCarthy

Fremont (California/USA)

80mm (13x)

Omega Tau: very wide finder split, 2 delta mag.

★

STTA44

7^m.1

8^m.0

58.6"

321°

2017

Per

04^h17^m19.77^s / +46°13'03.60"

Robert Zebahl

Leipzig (Germany)

16x70

2020-11-07: Very nice sight, moderate separation & difference in brightness. Slightly yellow-orange & subtle bluish.

★

STF520

8^m.3

8^m.4

0.6"

83°

2019

Tau

04^h18^m14.55^s / +22°48'24.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Faint elongated to overlapping disks.

STTA49

7^m.8

7^m.9

102.7"

324°

2015

Tau

04^h18^m58.95^s / +01°45'01.50"

René Merting

Drachhausen (Germany)

12x42

ein gleichhelles Pärchen mit Südost-Nordwest-Ausdehnung - die schwächere Komponente im Südosten zeigt sich mehr als komfortabel getrennt von A - das Paar ist trotzdem auffällig, da es isoliert steht - im erweiterten Umfeld sind viele gleich helle Sterne zu sehen

★

STF519 & GUI5

STF519

7^m.8

9^m.4

17.9"

348°

2015

Per

04^h20^m53.71^s / +50°22'39.00"

GUI5

7^m.8

10^m.8

108.8"

193°

2015

Robert Zebahl Leipzig (Germany)	16x70	STF519 (AB): 2020-11-07: Beautifully framed by brighter stars! Primary component A appears slightly orange with a much fainter, very close companion. To the south is S445, which forms a prominent triangle of stars of different brightness. The brightest of these three stars also appears orange.
Robert Zebahl Leipzig (Germany)	102mm (28x)	STF519 (AB): 2020-11-08: Well separated with large difference in brightness. Primary component appeared white-yellowish. South very outstanding is the double star S445. Worthwhile due to the beautiful surroundings.

S445 & ES2604

S445

7^m.3

8^m.2

71.0"

328°

2017

Per

04^h20^m57.50^s / +50°15'17.40"

S445

7^m.3

9^m.3

150.3"

263°

2016

ES2604

7^m.3

14^m.8

24.8"

321°

2015

ES2604

8^m.2

11^m.2

23.3"

263°

2015

Robert Zebahl Leipzig (Germany)	16x70	2020-11-07: Together with the uneven double star STF519 in one field of view. The three widely separated, differently bright components A, B and C form a prominent triangle, with A appearing orange. Very beautiful!
Robert Zebahl Leipzig (Germany)	102mm (28x)	2020-11-08: Components A, B & C visible as a prominent triangle of different brightness. Component A appears slightly yellowish. Together with the northern located double star STF519 in one field of view. Very nice!

STF521

7^m.4

9^m.2

2.1"

257°

2015

Per

04^h21^m45.39^s / +50°02'06.50"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very fine light yellow stars, ~2 delta mag, ~2", very nice looking pair

BU310

7^m.1

12^m.6

18.9"

173°

2015

Per

04^h22^m00.26^s / +39°56'03.30"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

The pair is one or both of two faint widly separated stars, makes a triangle. A is light orange.

BU87

6^m.2

8^m.6

1.9"

167°

2012

Tau

04^h22^m22.74^s / +20°49'16.40"

Mark McCarthy Fremont (California/USA)	203mm (205x)	Very fine bright light orange A star and a much fainter B star just separated. Best seen with the 8-inch mask which shows nice Airy disks, orange A and light blue B. Binarity uncertain with 38 measures. Burnham discovered with 6-inch and noted: "A fine colored pair, golden:blue"
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange star with 1.5" blue 3 delta mag pair. Definite disks, well split, round with seeing.

STT82

7^m.3

8^m.6

1.2"

327°

2018

Tau

04^h22^m44.10^s / +15°03'22.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very close, 0.8" 1.5 delta mag, PA to N/NW.

STF533

7^m.3

8^m.5

20.2"

61°

2017

Per

04^h24^m24.85^s / +34°18'53.10"

Mark McCarthy

Fremont (California/USA)

80mm (13x)

Finder split, fairly wide, 1 delta mag

STT81, 56 Per

5^m.8

9^m.2

4.2"

13°

2017

Per

04^h24^m37.46^s / +33°57'34.90"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

56 Per. Pretty yellow and slight red pair, 2 delta mag.

STF541, kap 1 Tau

4^m.2

5^m.3

339.4"

174°

2016

Tau

04^h25^m22.16^s / +22°17'37.90"

Mark McCarthy

Fremont (California/USA)

178mm (203x)

AB is a bright white pair, super wide, approximately 1 delta mag. Nearly in between is a near equal faint pair of 10th magnitude stars, approximately 6" separated, with a PA slightly off-kilter to the AB pair. The A star is an Aa-Ab pair, OCC 327, equal magnitudes but no separation given, from the Occulting Doubles Catalog -- I wonder if it would show out of round visually with aperture & high magnification

STF546

7^m.9

9^m.2

6.8"

181°

2015

Tau

04^h27^m00.62^s / +19°07'03.60"

Uwe Pilz

Leipzig (Germany)

105mm (144x)

../projects/double-stars/uwe-pilz/sketches/200115stf546.jpg

STF545

6^m.9

8^m.8

19.0"

58°

2020

Tau

04^h27^m04.85^s / +18°12'27.10"

Uwe Pilz Leipzig (Germany)	105mm (288x)	Begleiter schwach, erfordert sehr hohe Vergrößerung. Hauptstern weiß
Mark McCarthy Fremont (California/USA)	317mm (553x)	Blush white, ~2 delta mag, PA to NE, wide separation.

★★★

STFA10, theta 2 Tau, 78 Tau

3^m.4

3^m.9

347.9"

339°

2016

Tau

04^h28^m39.74^s / +15°52'15.20"

Christopher Hay Seeheim (Germany)	2x54	Well separated, luminous orange and ice blue. Gorgeous with entire Hyades and Pleiades in 25° field of view. Theta Tau is a physical double at a distance to us of 150 light years.
Christopher Hay Seeheim (Germany)	7x45	Theta Tauri. Luminous orange and blue. Wide apart but very much feeling to belong together, despite the many stars of the Hyades all around. A physical pair. The data suggest separation with naked eye is possible, something to try in good health under a steady sky. At all events with naked eye Theta Tauri is at the centre of the southern stroke of the Hyades' distinctive "V" shape. In the binoculars, by ignoring Aldebaran, which is not a cluster member but a foreground star, it suddenly becomes apparent that Theta Tauri is in fact at the centre of the Hyades in our sky and is its lucida. This impression is supported very nicely by 7x and 8.6° FOV. Definitely one of the finest doubles for this class of binocular.

HU1080

6^m.8

8^m.4

0.2"

266°

2016

Tau

04^h28^m59.78^s / +16°09'32.70"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Used 533x & 667x. I could detect elongation at 533x, and significant notching with 667x, enough to tell which was A & B and the position angle, which I put at nearly E-W (B is tightly WSW currently). Physical with a 40.752-year period, it is widening and reaches apastron in 2029, so maybe I'll get a clean split and a more accurate PA estimate at that time

BGH2, V921 Tau

7^m.0

9^m.1

109.5"

9°

2015

Tau

04^h29^m30.35^s / +17°51'47.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

White, wide, 1 delta mag.

STF554, 80 Tau

5^m.7

8^m.1

1.4"

15°

2018

Tau

04^h30^m08.60^s / +15°38'16.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

1" 2 delta mag, PA N. Nice!

LDS2246

4^m.8

6^m.5

250.3"

131°

2014

Tau

04^h30^m33.63^s / +16°11'38.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

A star is white, bright, perfect disk, the pair very wide, 2 delta mag.

STF560

6^m.3

9^m.3

29.6"

45°

2015

Eri

04^h31^m25.85^s / -13°38'39.20"

René Merting

Drachhausen (Germany)

12x42

B zeigt sich knapp getrennt nordöstlich von A - großer Helligkeitsunterschied von bestimmt drei Größenklassen - A ist reinweiß und B mausgrau, wie so oft bei solch unterschiedlich hellen Paaren

★★

STF559

7^m.0

3.0"

278°

2019

Tau

04^h33^m33.04^s / +18°01'00.20"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Barely split with similarly bright components.
Robert Zebahl Leipzig (Germany)	102mm (160x)	Very nice view! Easy to separate, similarly bright at a nice distance from each other. The colors of the components changed over time: orange and subtle blue.
Uwe Pilz Leipzig (Germany)	105mm (144x)	trennbar mit 88x, westlicher Stern scheint etwas heller und gelb-orange, östlicher Stern orange
Robert Zebahl Leipzig (Germany)	152mm (69x)	Beautiful sight, similar bright components, pretty tight.

SHJ45, 88 Tau

4^m.3

7^m.8

69.2"

300°

2017

Tau

04^h35^m39.23^s / +10°09'39.30"

Sarah Gebauer

Germany

150mm (30x)

mit freiem Auge als ein Stern erkannt, bei 30x sauber getrennt mit sichtbarem Helligkeitsunterschied

../projects/double-stars/sarah-gebauer/sketches/20191230%2088%20Tau%20DSk.jpg

STFB2, alp Tau

0^m.8

11^m.3

136.5"

31°

2016

Tau

04^h35^m55.24^s / +16°30'33.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Aldebaran: Very bright orange with a lot of glare, but there is a steady faint star halfway to the field stop

STTA53

7^m.5

7^m.6

78.8"

352°

2017

Tau

04^h37^m26.72^s / +00°33'11.20"

René Merting Drachhausen (Germany)	12x42	zwei gleich helle Sterne nordsüd-ausgerichtet - zwei graue Mäuse, komfortabel getrennt
Mark McCarthy Fremont (California/USA)	80mm (13x)	Finder split, 1 delta mag. White and dully yellow.

STF576

7^m.3

7^m.8

12.3"

172°

2017

Eri

04^h37^m59.75^s / -13°01'44.00"

René Merting

Drachhausen (Germany)

12x42

der Stern erscheint leicht länglich, mehr geht nicht, auch keine Einschnürung - auf jeden Fall ist erkennbar, dass dort kein Einzelstern steht

★★

STF572

7^m.4

7^m.2

4.4"

189°

2018

Tau

04^h38^m29.58^s / +26°56'25.60"

Christopher Hay Seeheim (Germany)	42mm (12x)	Slightly elongated. PA seen definitely without prior knowledge, confirmed in 3-inch.
Robert Zebahl Leipzig (Germany)	70mm (57x)	Clearly separated, easy with beautiful color contrast: A slightly orange, B white.
Christopher Hay Seeheim (Germany)	76mm (83x)	Well separated, very even matched pair.

STFA11, sigma 2 Tau, 92 Tau

4^m.7

5^m.1

444.0"

194°

2014

Tau

04^h39^m16.50^s / +15°55'04.70"

Christopher Hay

Seeheim (Germany)

7x45

Very wide and attractive with whole of Hyades in 7.2° field of view, which notably includes the similarly wide Theta Tau (STFA10). Both components blue-white.
Sigma Tau is a physical double at a distance to us of 156 light years.

S455, tau Tau, 94 Tau

4^m.2

7^m.0

62.5"

214°

2017

Tau

04^h42^m14.70^s / +22°57'25.10"

Sarah Gebauer Germany	150mm (26x)	schon bei 26x deutlich getrennt
Sarah Gebauer Germany	150mm (30x)	mit freiem Auge als ein Stern gesehen, bei 30x weit getrennt, eine Komponente ist deutlich heller als die andere

LDS2266

7^m.2

10^m.2

141.7"

103°

2015

Tau

04^h42^m51.64^s / +18°43'14.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange, with a very wide 2 delta mag pair.

COU2031

6^m.9

7^m.8

0.0"

28°

2011

Per

04^h46^m26.92^s / +42°20'54.20"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

A badly misshaped star, elongated, SSE PA, but nothing really clear, very small scale. Physical with a 20.58 year period, it will close to periastron rapidly in the next 5 years, and really not be detectible visually until it returns to apastron in the late 2030s

STF587

7^m.6

9^m.2

21.0"

185°

2018

Cam

04^h48^m01.72^s / +53°07'19.20"

Robert Zebahl

Leipzig (Germany)

16x70

2020-11-07: Easily separable with clear brightness difference. Moderately bright with faint companion at moderate distance. Color wise unspectacular.

STTA55

8^m.2

9^m.2

37.4"

17°

2015

Ori

04^h49^m07.80^s / +05°12'30.70"

René Merting

Drachhausen (Germany)

100mm (20x)

bei 32x ein schön weit auseinander stehendes filigranes Sternpaar - Komponente B im NO wirkt eine halbe Größenklasse schwächer, das Weiß nicht ganz so klar wie bei A - zurück auf 20x ist das Paar nicht mehr ganz so klar im Umfeld, kann aber weiterhin gut getrennt gesehen werden

STT560, pi 3 Ori

3^m.2

11^m.3

73.2"

171°

2016

Ori

04^h49^m50.41^s / +06°57'40.60"

Uwe Pilz

Leipzig (Germany)

105mm (144x)

wahrscheinlich ein optischer Doppelstern

../projects/double-stars/uwe-pilz/sketches/210222Pi3Ori.jpg

BU552

6^m.4

8^m.9

0.8"

274°

2019

Ori

04^h51^m49.92^s / +13°39'18.70"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Light yellow A and light orange B, well separated when seeing stills and the stars form airy disks, short period pair with a 97.7 year period. This will continue increasing to apastron in 2030 and beyond, though the PA will remain about the same -- I think in the future it will be splittable in lower magnifications, which is how I would notice any change. Burnham writes: "This pair was discovered with the 18.5-inch, but in looking over the old observing books used with the 6-inch, I find that on December 14, 1874, this star was noted as 'possibly a close pair'â€¦There seems to be something singular about the appearance and difficulty of this pair at times with larger apertures. It was not noted as difficult at the time of the observation in 1877. in 1890 it was a hard star with the 36-inch and on two nights in 1892, under favorable conditions, I failed to see it double at all."

S457

7^m.9

8^m.1

41.0"

355°

2020

Ori

04^h53^m04.82^s / -01°16'32.80"

René Merting

Drachhausen (Germany)

12x42

zwei relativ schwache, gleich helle Sterne in Nordsüdausrichtung, ordentlich getrennt und relativ allein stehend

STF612

8^m.3

8^m.4

16.0"

200°

2020

Ori

04^h54^m16.64^s / +07°22'22.90"

René Merting Drachhausen (Germany)	18x70	ein sehenswerter Fernglas-Doppelstern, zumindest bei 18-facher Vergrößerung - ein schön eng stehendes knapp getrenntes Pärchen zweier gleich heller Sterne
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein schickes Paar gut getrennter eng stehender Sterne - Komponente B im Süden wirkt etwas dunkler/dumpfer - das Sternpaar wirkt wie allein gelassen im Umfeld - zurück auf 20x ist die Trennung zwischen beiden Sternen ganz knapp zu erkennen

62 Eri, SHJ48

5^m.5

8^m.9

66.1"

76°

2013

Eri

04^h56^m24.19^s / -05°10'16.90"

René Merting Drachhausen (Germany)	12x42	Komponente B ist schwach östlich von A zu erkennen - ich muss sehr genau hinschauen, um das kleine Pünktchen zu erkennen, das wie ein Schatten von A wirkt - Trennung zwischen ordentlich und knapp, eigentlich ein Ding bei 66" Abstand, aber vermutlich der Helligkeit von A geschuldet
Mark McCarthy Fremont (California/USA)	317mm (277x)	White stars, pretty wide 2 delta mag, PA to west. Did not notice Aa-Ab 0.6"

STF622

8^m.5

8^m.6

2.6"

162°

2020

Ori

04^h58^m06.20^s / +01°40'31.60"

René Merting

Drachhausen (Germany)

100mm (107x)

bei 107x ein ganz knapp getrenntes Pärchen in Nordsüd-Ausrichtung - beide Sterne sind gleich hell bzw. gleich schwach - schwer

★★

STF616, omega Aur, 4 Aur

5^m.0

8^m.2

4.7"

4°

2015

Aur

04^h59^m15.41^s / +37°53'24.90"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Easy, still relatively tight with a large difference in brightness. Component A appeared pretty bright and white-yellowish, while B appeared only as a tiny star. Very nice sight.
Uwe Pilz Leipzig (Germany)	105mm (88x)	blau und weiß
Uwe Pilz Leipzig (Germany)	105mm (144x)	gelb. Schöner Helligkeitskontrast, dabei aber einfach. Auch bei 88x trennbar
Mark McCarthy Fremont (California/USA)	178mm (205x)	Most beautiful light blue A and light orange B, wide around 5", 3 delta mag.
Mark McCarthy Fremont (California/USA)	203mm (113x)	Omega Aurigae. The A was a surprising sickly blue-green color, and the B was a tawny brown, nicely split 5" away.

STF623

7^m.0

8^m.7

20.5"

207°

2018

Tau

04^h59^m53.75^s / +27°19'32.20"

Uwe Pilz

Leipzig (Germany)

105mm (88x)

erkennbar bei 21x

../projects/double-stars/uwe-pilz/sketches/200215_Struve623.jpg

STT92, 5 Aur

6^m.0

9^m.5

4.1"

285°

2017

Aur

05^h00^m18.35^s / +39°23'40.90"

Uwe Pilz Leipzig (Germany)	105mm (160x)	schwierig
Uwe Pilz Leipzig (Germany)	105mm (288x)	Nur bei sehr hoher Vergrößerung überhaupt zu trennen, schwierig

STF627

6^m.6

7^m.0

21.2"

260°

2020

Ori

05^h00^m33.93^s / +03°36'56.80"

René Merting Drachhausen (Germany)	18x70	zwei klar sichtbare bequem getrennte Sterne - Komponente B im SW wirkt leicht gelblicher als A - maximal 1/4 Größenklasse Helligkeitsunterschied - ein schöner nicht zu eng und nicht zu weit getrennter Fernglas-Doppelstern
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein bequem getrenntes Pärchen zweier annähernd gleich heller Sterne - Komponente B im Westen ist vielleicht eine viertel Magnitude schwächer - das Sternpaar fällt auf in der Umgebung, weil es kaum hellere Sterne im Umfeld gibt - zurück auf 20x ist es ein schickes eng stehendes Paar, aber nicht zu eng
Uwe Pilz Leipzig (Germany)	105mm (16x)	erkennbar schon bei Fernglasvergrößerung

STF630

A-BC

6^m.5

7^m.7

14.4"

49°

2020

Ori

05^h02^m00.03^s / +01°36'31.90"

René Merting Drachhausen (Germany)	18x70	schick, ein auffälliges knapp getrenntes Pärchen - Komponente B im NO ist keine ganze Größenklasse schwächer (lt. Stelle Doppie aber doch 1.21 mag)
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein knapp getrenntes Pärchen - Komponente BC im NO scheint eine knappe Größenklasse schwächer, er wirkt ein wenig bunter, matter - zurück auf 20x wirkt das Pärchen schicker, weil die beiden Komponenten dann noch enger stehen - der Helligkeitsunterschied ist nicht mehr ganz so ausgeprägt
Uwe Pilz Leipzig (Germany)	105mm (88x)	gelb-orange und fahlviolett

STF636

7^m.1

8^m.5

3.7"

104°

2017

Eri

05^h03^m01.95^s / -08°39'47.40"

René Merting Drachhausen (Germany)	100mm (107x)	erst bei 107x offenbart der Doppelstern seinen Begleiter östlich von Komponente A - knappe Trennung nur mit viel Konzentration erkennbar
Mark McCarthy Fremont (California/USA)	317mm (277x)	Faint, small, close pair, white and orange, 2 delta mag, PA to east. Nice tight pair but still well split.

WDK1

10^m.0

13^m.7

5.6"

279°

2015

Cam

05^h03^m23.90^s / +53°07'42.50"

Robert Zebahl

Leipzig (Germany)

70mm (67x)

The double star could not be identified at magnifications between 67x and 133x even with a finder chart.

S459, beta Cam, 10 Cam

4^m.1

7^m.4

84.2"

209°

2017

Cam

05^h03^m25.10^s / +60°26'32.20"

René Merting

Drachhausen (Germany)

320mm (45x)

bei 45x eine wunderschöne A-Komponente, ein strahlendes Mais- Gelb - die B-Komponente weit abgesetzt im SW ist mindestens 2 Größenklassen schwächer (3.32 mag lt. Stelle Doppie), Farbeindruck weißgrau

J307

A-BC

6^m.8

9^m.3

53.5"

320°

2020

Ori

05^h03^m42.85^s / -02°32'23.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange star, very wide B, 1 delta mag to the NNW. Did not see BC 0.3"

66 Eri, STF642

5^m.1

10^m.8

52.2"

10°

2011

Eri

05^h06^m45.65^s / -04°39'18.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Bright white with much fainter star to the NW, very wide split.

STF649

5^m.8

9^m.0

21.3"

69°

2017

Eri

05^h08^m20.18^s / -08°39'55.10"

5^m.8

11^m.3

87.5"

4°

2017

9^m.0

11^m.3

80.7"

350°

2017

René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 32x üppig getrennt - Komponente B im NO ist sehr schwach erkennbar und mindestens 2.5 Größenklassen schwächer (3.2 mag sogar lt. Stelle Doppie) - A weiß, B kommt über graubraun nicht hinaus - zurück auf 20x ist B weiterhin noch einigermaßen erkennbar, die Trennung etwas weniger üppig
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Yellow A, red B, ~3 delta mag, well split.

★

STF645 & BU1047

STF645

A-BC

6^m.0

9^m.1

11.3"

29°

2017

Tau

05^h09^m45.06^s / +28°01'50.20"

BU1047

9^m.1

9^m.7

0.2"

99°

2007

Uwe Pilz Leipzig (Germany)	105mm (88x)	STF645 (A-BC)
Mark McCarthy Fremont (California/USA)	317mm (270x)	STF645 (A-BC): White and grey, 2 delta mag, wide. BC is BU 1047 0.3" near equal, but not seen
Mark McCarthy Fremont (California/USA)	508mm (667x)	BU1047 (BC): Component of STF 645. Awesome flex on Struve. Near equal BC stars suspected at 533x, hairline split at 667x. A really fine little blue pair near bright white A. Physical with a 32.1-year period, it is at apastron now and will get impossibly close in the 2030s, becoming visually detectible again in the later part of that decade. Burnham discovered in 1889 with the Lick 36-inch, and recorded 0.4" separation

BGH21

7^m.0

9^m.3

314.6"

353°

2015

Tau

05^h10^m03.87^s / +27°33'23.40"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

Yellowish-white star, the pair the faint, very wide star seen in the scope and finder.

★★

STF644

7^m.0

6^m.8

1.6"

221°

2019

Aur

05^h10^m18.81^s / +37°18'06.70"

Robert Zebahl Leipzig (Germany)	70mm (100x)	At 57x slightly elongated with a partially visible notching. At 100x & 133x two clearly overlapping diffraction disks are visible as figure '8' with a small difference in brightness.
Robert Zebahl Leipzig (Germany)	102mm (129x)	Grand sight! Two almost touching diffraction disks, slight difference in brightness, both slightly yellowish.
Uwe Pilz Leipzig (Germany)	105mm (200x)	Beide Orange, mit schwarzem Zwischenraum. Lohnend
Robert Zebahl Leipzig (Germany)	152mm (129x)	Great view, easy to separate, but still quite close together with low difference in brightness. Both components appeared slightly orange.

STF648

8^m.1

8^m.9

5.0"

64°

2020

Aur

05^h10^m59.19^s / +32°02'19.50"

Robert Zebahl Leipzig (Germany)	55mm (40x)	At 40x tight with obviously fainter component.
Robert Zebahl Leipzig (Germany)	70mm (33x)	Separated, but tight with noticeable difference in brightness.
Uwe Pilz Leipzig (Germany)	105mm (144x)	beide Komponenten gelb
Mark McCarthy Fremont (California/USA)	317mm (270x)	Light orange, half delta mag, wide.

STF652

6^m.3

7^m.4

1.7"

180°

2017

Ori

05^h11^m45.35^s / +01°02'12.50"

Uwe Pilz Leipzig (Germany)	105mm (260x)	Länglich, 0“7
Mark McCarthy Fremont (California/USA)	203mm (333x)	Very nice light orange A and greenish blue B, well split ~1.5", 2 delta

STF655, iota Lep, 3 Lep

4^m.5

9^m.9

12.0"

337°

1998

Lep

05^h12^m17.89^s / -11°52'08.90"

René Merting

Drachhausen (Germany)

100mm (32x)

hier habe ich mich täuschen lassen von einem weiter entfernt stehenden Stern nordöstlich, den ich für die B-Komponente gehalten habe - bei 32x und bei 64x konnte ich den im Nachgang recherchierten wesentlich schwächeren Begleiter in nur 12" Abstand allerdings nicht ausmachen

S470

8^m.5

47.6"

279°

2015

Lep

05^h12^m33.01^s / -17°27'16.50"

René Merting

Drachhausen (Germany)

12x42

ein ordentlich getrenntes Sternpaar in relativ sternarmer Umgebung - beide Sterne sind relativ schwach und ich kann nicht feststellen, welcher Stern schwächer ist - zumindest im 12x42 ein zartes Sternpaar unter den Doppelsternen

STF661, kappa Lep

4^m.4

6^m.8

2.2"

357°

2008

Lep

05^h13^m13.87^s / -12°56'26.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

~3-4 delta mag! ~1.5-2", B in A's diffraction.

STF654, rho Ori

4^m.6

8^m.5

6.4"

65°

2018

Ori

05^h13^m17.48^s / +02°51'40.50"

Uwe Pilz Leipzig (Germany)	105mm (88x)
Mark McCarthy Fremont (California/USA)	203mm (333x)	Rho Ori Bright light orange-yellow A star with 3 delta mag yellow-white B, ~5"

STT517

6^m.8

7^m.0

0.7"

244°

2019

Ori

05^h13^m31.55^s / +01°58'03.70"

Uwe Pilz Leipzig (Germany)	105mm (144x)	Es erforderte einige Mühe zu sehen, welches der hellere Stern ist,
Mark McCarthy Fremont (California/USA)	203mm (333x)	Consistently split but images are bloated by poor seeing, yellowish white stars, <1", near equal

★★★

STF668, 19 Ori, beta Ori, Rigel

A-BC

0^m.3

6^m.8

9.7"

202°

2017

Ori

05^h14^m32.27^s / -08°12'05.90"

Robert Zebahl Leipzig (Germany)	55mm (83x)	The second component was immediately seen as faint companion.
Robert Zebahl Leipzig (Germany)	70mm (67x)	First attempt at 133x: much fainter component clearly visible as a tiny star at a relatively large distance. After that the visibility was easy even at 67x. At 44x the faint component could only be guessed.
Robert Zebahl Leipzig (Germany)	102mm (160x)	Much fainter companion immediately visible as tiny star far outside the diffraction pattern of the primary component.
Uwe Pilz Leipzig (Germany)	105mm (288x)	zwei Ringe und zahlreiche radiale Strahlen um den Hauptstern
Jörg S. Schlimmer Germany	127mm (108x)	high contrast
Jörg S. Schlimmer Germany	305mm (170x)	high contrast

STF667

7^m.2

8^m.8

4.2"

316°

2018

Ori

05^h14^m41.31^s / -07°04'18.10"

René Merting Drachhausen (Germany)	100mm (107x)	bei 64x stehen beide Sterne noch eng aneinander - ein Phänomen, Komponente A im SO ist nicht richtig weiß, die 1.5 mag schwächere Komponente B wirkt dagegen weiß, also trotz großem Helligkeitsunterschied sauberer weiß - erst bei 107x gelingt mir die sichere Trennung, kein Wunder bei dem schlechten Seeing heute
Uwe Pilz Leipzig (Germany)	105mm (120x)
Mark McCarthy Fremont (California/USA)	317mm (553x)	Pretty orange A and 2x fainter B, which is a little blue-orange. 5"

STF664

7^m.8

8^m.4

4.8"

177°

2019

Ori

05^h15^m10.54^s / +08°25'56.80"

Robert Zebahl Leipzig (Germany)	70mm (100x)	At 44x barely split. At 100x easily split with obvious difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Near equal, well split, "headlights in fog" pair. Slightly yellow

BVD51

7^m.8

9^m.6

44.5"

317°

2016

Ori

05^h15^m23.69^s / -03°21'57.40"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

Wide, 2 delta mag pair, A star is slightly red.

★★

STF653, 14 Aur

5^m.0

10^m.9

9.8"

11°

2014

Aur

05^h15^m24.39^s / +32°41'15.30"

5^m.0

7^m.3

14.3"

225°

2019

5^m.0

10^m.8

179.7"

322°

2010

Sarah Gebauer Germany	100mm (45x)	AC: schon bei geringer Vergrößerung erkennt man beim zweiten Hinsehen, dass es sich um ein Sternpärchen handelt; ein schönes Doppelsternbeispiel für die Kategorie "ein heller und ein sehr schwacher nah daneben"
Uwe Pilz Leipzig (Germany)	105mm (88x)	AC: heller Stern gelblich weiß
Mark McCarthy Fremont (California/USA)	317mm (270x)	AB: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]
Mark McCarthy Fremont (California/USA)	317mm (270x)	AC: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]

A2638

9^m.2

9^m.4

1.0"

280°

2017

Ori

05^h15^m52.51^s / +03°44'55.70"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Tough pair in these conditions, moon haze. Slightly unequal and very close, resolves with seeing to two distinct faint points, but a haze around them

BU318

8^m.8

8^m.3

0.5"

267°

2019

Ori

05^h16^m14.58^s / -03°28'59.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Elongation, certainly a pair, but not resolved

★

STF666

7^m.8

7^m.9

3.2"

75°

2019

Aur

05^h17^m05.80^s / +33°19'47.20"

Robert Zebahl Leipzig (Germany)	55mm (83x)	At 40x slightly elongated, at 38x separated, but tight. Overall faint with components of similar brightness.
Robert Zebahl Leipzig (Germany)	70mm (57x)	Split, no difference in brightness and color. Very nice!
Sarah Gebauer Germany	100mm (136x)	eine Grenzbeobachtung mit dem Vierzöller, aber die Trennung des eher schwachen Pärchens gelingt ganz knapp

S473

7^m.0

8^m.5

20.6"

307°

2018

Lep

05^h17^m35.50^s / -15°13'10.50"

René Merting Drachhausen (Germany)	12x42	Komponente B zeigt sich ganz schwach nordwestlich von A - knappe Trennung - den Größenunterschied schätze ich hier auf 3 Größenklassen (es sind aber nur 1.5 mag lt. Stelle Doppie)
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x leicht - Komponente A im SO zeigt sich gut getrennt von B im NW - Helligkeitsunterschied gut 1.5 bis 2 Größenklassen, dadurch leichter Farbkontrast - zurück auf 20x sind beide Sterne auch noch getrennt erkennbar, nun natürlich sehr eng stehend

STF678

9^m.1

9^m.4

3.6"

104°

2018

Ori

05^h17^m39.01^s / +04°41'01.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Nice pair, near equal, pretty wide, nice view with seeing

A2639

8^m.6

9^m.7

0.8"

277°

2017

Ori

05^h18^m03.50^s / +03°41'30.40"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Light white-yellow and 2 delta mag B, ~0.8"

STF669

8^m.4

9^m.0

9.8"

278°

2020

Aur

05^h18^m56.78^s / +45°14'51.40"

Robert Zebahl Leipzig (Germany)	55mm (25x)	Well separated with visible difference in brightness.
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x ein feines, kleines Sternpaar, knapp getrennt, auffallend - B im Westen ist eine halbe Größenklasse schwächer

★

S476

6^m.3

6^m.5

39.3"

19°

2018

Lep

05^h19^m17.44^s / -18°31'11.80"

René Merting Drachhausen (Germany)	12x42	sehr schick im FG - ein auffallendes Sternpaar mit Farbkontrast - die A-Komponente im Süden strahlt blauweiß, B im Norden ist nur knapp schwächer und wirkt reinweiß
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x adäquat getrennt, zwei gleich helle weiße Sterne - sehr auffällig im Umfeld - zurück auf 20x noch besserer Pärcheneindruck, knappe Trennung

STF688

7^m.5

10.5"

95°

2020

Ori

05^h19^m20.88^s / -10°44'49.90"

Robert Zebahl Leipzig (Germany)	70mm (44x)	Clearly split with decent angular distance. Components appeared nearly equally bright.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein schön anzusehendes enges Pärchen - zwei unschuldig gleich helle weiß schimmernde Sterne in Ost-West-Ausrichtung - zurück auf 20x berühren sich die beiden Kügelchen hauchzart

BU190 & STF692

BU190

8^m.1

8^m.4

0.6"

327°

2019

Ori

05^h20^m24.16^s / -08°01'47.00"

STF692

AB-C

7^m.6

8^m.6

34.9"

5°

2019

René Merting

Drachhausen (Germany)

100mm (20x)

STF692 (AB-C): bei 32x weit getrennt, Komponente AB im Süden ist knapp eine Größenklasse heller - AB weiß, C braungrau - das Paar ist auffällig, da es kaum vergleichbar helle Sterne im direkten Umfeld gibt - zurück auf 20x sind beide Sterne weiterhin ordentlich getrennt erkennbar, C wirkt jetzt nur noch grau, AB leicht gelblich

BU189

6^m.4

9^m.8

4.6"

285°

2002

Ori

05^h20^m26.41^s / -05°22'03.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

With good seeing and averted vision a 3x fainter point comes into view, can barely hold it, ~5".

STF681

6^m.6

9^m.2

23.2"

183°

2020

Aur

05^h20^m39.16^s / +46°57'49.60"

Robert Zebahl Leipzig (Germany)	16x70	2020-11-07: Together with Capella in one field of view. Beautiful surrounding. Moderate distance and large difference in brightness. Primary component appears white-yellowish with faint companion.
Uwe Pilz Leipzig (Germany)	105mm (88x)	orange

KU87

7^m.8

10^m.0

35.9"

104°

2015

Tau

05^h21^m39.91^s / +18°54'24.50"

René Merting

Drachhausen (Germany)

18x70

eine echte Herausforderung - Komponente B taucht mit etwas Konzentration ganz schwach östlich von A auf - Komponente A ist schon relativ schwach, B ist schätzungsweise 2 Größenklassen schwächer

STT105

8^m.6

0.2"

122°

2000

Ori

05^h21^m40.47^s / +12°40'06.20"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

very widely separated (11") orange pair. Pretty bright (7.3, 8.3).

STF684

7^m.7

9^m.3

1.5"

141°

2016

Aur

05^h22^m11.04^s / +45°04'53.90"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

Fine white and yellow, 2-3" at this scale, 2 delta mag. 20,000 light years distant, is actually quite a large distance for the average double star

STT106

7^m.1

10^m.1

9.5"

40°

2015

Ori

05^h22^m11.20^s / +05°23'43.10"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

~4 delta mag B, wide, ivory color

★★

STF696, 23 Ori

5^m.0

6^m.8

32.0"

29°

2019

Ori

05^h22^m50.00^s / +03°32'40.00"

Christopher Hay Seeheim (Germany)	15x45	Widely separated but still a little difficult to hold due to large delta-mag. A physical double at a distance to us of 1553 light years, which is practically the same as Theta 2 Ori in the great Orion Nebula M42.
René Merting Drachhausen (Germany)	18x70	ein auffälliges gut getrenntes Paar - Komponente B im Norden ist 1.5 Größenklassen schwächer

★

HU1225

7^m.8

11^m.0

3.4"

320°

1991

Ori

05^h22^m56.87^s / +14°21'40.00"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Visible with 20" only, the B star is too faint for the 8" in these conditions. A is light orange, B a deeper orange compared with A, 4 delta mag and ~3.5"

STF700, V1804 Ori

7^m.7

7^m.9

4.8"

4°

2017

Ori

05^h23^m05.54^s / +01°03'24.70"

Robert Zebahl Leipzig (Germany)	70mm (44x)	At 44x split, but very close together. At 100x clearly split with nearly equally bright components.
Mark McCarthy Fremont (California/USA)	508mm (533x)	V1804 Ori. Near equal white pretty wide

STT104

7^m.0

11^m.1

21.4"

190°

2014

Aur

05^h23^m12.61^s / +47°01'17.90"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Very wide separation (208"!) orange pair.

STF701

6^m.1

8^m.1

6.2"

139°

2019

Ori

05^h23^m18.50^s / -08°24'55.90"

René Merting Drachhausen (Germany)	100mm (107x)	bei 107x ploppt südöstlich leicht abgesetzt von A die B-Komponente auf - A leuchtet weiß, B ist schwer zu sehen, also ohne Farbe
Mark McCarthy Fremont (California/USA)	317mm (553x)	White and rusty red color, ~6", 1 delta mag.

STF697

7^m.3

8^m.1

25.4"

287°

2019

Ori

05^h23^m31.74^s / +16°02'25.80"

René Merting

Drachhausen (Germany)

18x70

ein ordentlich getrenntes Pärchen - Komponente A strahlt weißgelblich, B im NW ist etwas mehr als eine halbe Größenklasse schwächer und wirkt kupfergrau

★★★

Winnecke 2, WNC2

A-BC

6^m.9

7^m.0

3.1"

159°

2019

Ori

05^h23^m51.32^s / -00°51'59.80"

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

STF702

9^m.6

10^m.1

8.3"

80°

2019

Ori

05^h24^m17.61^s / +02°22'04.60"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Wide, bluish for faintness, probably not physical [not physical]

ES576

8^m.1

8^m.9

42.7"

237°

2015

Aur

05^h24^m22.85^s / +42°36'37.00"

Mark McCarthy

Fremont (California/USA)

317mm (270x)

Pretty finder split. In scope white stars, near equal to 0.5 delta mag.

DA5, eta Ori

3^m.6

4^m.9

1.8"

77°

2019

Ori

05^h24^m28.62^s / -02°23'49.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Split is 1 disk separation, PA to E-W, and delta mag is 0.5-1.

★

A2703

8^m.4

9^m.0

0.2"

90°

1995

Ori

05^h24^m33.14^s / +09°10'15.10"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Definite notch at best moments, slight magnitude difference, tough

S479

8^m.3

8^m.9

46.4"

220°

2014

Ori

05^h24^m38.61^s / +01°48'38.80"

8^m.3

4^m.8

157.5"

36°

2013

René Merting

Drachhausen (Germany)

18x70

AB: beide Komponenten stehen südwestlich vom hellen 25 Ori wie an einer Kette gezogen - die Trennung der Komponenten dieses Doppelsterns beträgt 1/3 Abstand 25 Ori zu Komponente A

HU1226

9^m.8

0.7"

55°

2016

Ori

05^h25^m05.57^s / +15°21'44.00"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Suspected at 333x but a bit too fuzzy. Nice very clean split at 533x, slightly orange stars, near equal

STF708

7^m.7

8^m.9

2.8"

321°

2017

Ori

05^h25^m11.28^s / +01°55'26.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Resolves only with seeing, fuzzy otherwise, about 2 delta mag and ~2"

★

STF698

6^m.7

8^m.3

31.4"

348°

2019

Aur

05^h25^m12.94^s / +34°51'18.60"

Robert Zebahl Leipzig (Germany)	102mm (62x)	Beautiful double star, easy to separate and quite striking. Primary component appeared in clear orange, the companion was too faint to identify the color.
Uwe Pilz Leipzig (Germany)	105mm (88x)	rot-orange und blaugrau, lohnend
Robert Zebahl Leipzig (Germany)	152mm (22x)	Easy with a attractive separation and a clear difference in brightness. A: pale yellow; B: creamy white with a touch of blue. At 49x the color impression was a bit more intense. Located in beautiful field of stars.
Mark McCarthy Fremont (California/USA)	317mm (270x)	Orange-yellow A and lilac B, wide, finder split, 1 delta mag. Pretty.

A848

6^m.9

7^m.9

0.3"

179°

2016

Ori

05^h25^m31.08^s / -00°32'38.20"

Mark McCarthy

Fremont (California/USA)

203mm (533x)

Suspect elongation at 333x, at 533x I get a snowman, very definite with seeing. White stars, noticeable mag difference

★

STF699

7^m.9

8^m.6

8.9"

346°

2018

Aur

05^h25^m38.50^s / +38°02'41.10"

Robert Zebahl Leipzig (Germany)	55mm (25x)	Well separated with slightly fainter companion.
Robert Zebahl Leipzig (Germany)	70mm (22x)	Separated at 22x, but still a relatively tight pair with a moderate difference in brightness. Together with sigma Aur in one field of view. Overall rather dim double star. At 57x very nice view! A: pale orange, B: slightly bluish
Uwe Pilz Leipzig (Germany)	105mm (88x)	schwach, aber lohnend. Orange und blau
Mark McCarthy Fremont (California/USA)	317mm (270x)	Wide yellow and blue-white, half delta mag.

HJ3759

5^m.9

7^m.3

26.6"

318°

2019

Lep

05^h25^m59.82^s / -19°41'43.40"

René Merting Drachhausen (Germany)	12x42	ein schön enges Paar - B im Nordwesten von A ist etwas besser als knapp getrennt - Helligkeitsunterschied 1 bis 1.5 Größenklassen - A ist gelblich weiß, B wirkt zart kupferweiß
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x zeigt sich ein bequem getrenntes Farbkontrastpärchen - Komponente A wirkt gelblich, die gut 1.5 Magnituden schwächere Komponente B im NW wirkt grauweiß

J589

11^m.9

12^m.2

5.0"

193°

2015

Ori

05^h26^m28.22^s / +14°55'45.20"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

I thought this would be harder since they are faint but they're an easy, wide light blue star pair, near equal

STF712

6^m.7

8^m.6

3.2"

66°

2017

Ori

05^h26^m31.22^s / +02°56'09.30"

René Merting Drachhausen (Germany)	100mm (107x)	bei 107x wird Komponente B ganz knapp getrennt östlich von A sichtbar und bestimmt zwei Größenklassen schwächer - kurios, trotz des großen Helligkeitsunterschiedes strahlt B genauso schön reinweiß wie A
Mark McCarthy Fremont (California/USA)	203mm (333x)	More than 1 delta mag, light off-white A and slightly blue B, wide

BRT1181

11^m.2

11^m.3

3.5"

354°

2015

Ori

05^h26^m47.03^s / +14°40'52.30"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Easy pair, light blue stars, half delta mag, wide ~3.5" [not physical]

STT107, 115 Tau

5^m.4

11^m.1

10.1"

305°

2016

Tau

05^h27^m10.09^s / +17°57'44.00"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

White stars, B appears with averted vision, wide

A2432

8^m.8

10^m.4

1.1"

294°

2016

Tau

05^h27^m29.02^s / +18°29'51.90"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Appears as an elongated smudge at first, finely split with seeing, brightens with averted vision

★

TDS3201

9^m.5

9^m.7

0.4"

237°

1991

Ori

05^h27^m40.03^s / +14°08'08.40"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

super fine but split, more than half delta mag, fine focus needed to remove any glare. What a nice pair, ice blue color stars

STF716, 118 Tau

5^m.8

6^m.7

4.6"

209°

2020

Tau

05^h29^m16.49^s / +25°09'01.10"

5^m.8

11^m.9

140.2"

99°

2001

Robert Zebahl Leipzig (Germany)	70mm (33x)	AB: At 33x very tight with visible difference in brightness. At 47x very nice view. Both components appeared white.
Sarah Gebauer Germany	150mm (26x)	AC: schon bei 26x weit getrennt
Mark McCarthy Fremont (California/USA)	203mm (333x)	AB: Lovely white stars, around 1 delta mag, wide split
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Equal white widely separated.

STT108

6^m.8

10^m.4

3.2"

129°

2015

Tau

05^h29^m19.14^s / +18°21'56.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

B is faint but certain, seen with direct vision, white stars, approximately 3". Physical

STF721 & GUI7 & BU557 & GMC13

STF721

A-BC

7^m.1

9^m.1

25.3"

149°

2014

Ori

05^h29^m33.52^s / +03°08'52.50"

GUI7

7^m.1

11^m.2

149.8"

147°

2014

BU557

9^m.9

0.2"

160°

1997

GMC13

11^m.2

12^m.9

11.1"

263°

2015

René Merting Drachhausen (Germany)	18x70	STF721 (A-BC): Komponente BC ist ganz schwach südöstlich von A erkennbar - BC ist irgendwie kein richtig klarer Lichtpunkt, aber er ist eben knapp getrennt von A zu erkennen
René Merting Drachhausen (Germany)	100mm (20x)	STF721 (A-BC): bei 32x ein schön isoliert stehendes weit getrenntes Doppelsternpärchen - Komponente BC im SO ist mehr als eineinhalb Größenklassen schwächer und strahlt grauweiß - etwas weiter südöstlich ist ein weiterer ganz schwacher Stern in vierfachem Abstand von A-BC erkennbar (separate Bezeichnung GUI7, Komponente D, 11.2 mag) - zurück auf 20x ist STF721 noch gut sichtbar, auf BC muss man sich ein wenig mehr konzentrieren
René Merting Drachhausen (Germany)	100mm (32x)	GUI7 (AD): bei 32x etwas weiter südöstlich von A-BC (STF721) ist Komponente D ganz schwach in vierfachem Abstand von A-BC erkennbar

HU217, LY Aur

7^m.2

8^m.3

0.7"

254°

2015

Aur

05^h29^m42.65^s / +35°22'30.10"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

nicht als DS gesehen

STF725

4^m.7

9^m.7

12.7"

87°

2015

Ori

05^h29^m43.98^s / -01°05'31.80"

René Merting Drachhausen (Germany)	100mm (64x)	bei 32x ist nur Komponente A goldgelb leuchtend erkennbar, Komponente B wird erst sichtbar bei 64x, der Stern zeigt sich ganz schwach östlich von A, die Trennung ist ordentlich - ohne das Wissen um den Doppelstern hätte ich ihn nie als solchen erkannt
Mark McCarthy Fremont (California/USA)	203mm (333x)	31 Ori Large mag difference but since is wide separation it is easier to see. Bluish B vs bright light orange A

★

HU1228

9^m.8

0.3"

16°

2007

Ori

05^h29^m48.07^s / +13°34'57.30"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Snowman overlapping disks at best moments, one second out of ten. Slightly orange stars and slight mag difference

★★

STF719

7^m.5

8^m.8

1.4"

336°

2016

Aur

05^h30^m06.14^s / +29°32'55.30"

7^m.5

9^m.4

15.0"

353°

2020

Robert Zebahl Leipzig (Germany)	70mm (22x)	AC: At 22x clearly visible difference in brightness at moderate separation. The companion appears only as a dim star. At 57x the color contrast is also quite noticeable. A: light orange, C: silvery blue
Robert Zebahl Leipzig (Germany)	102mm (62x)	AC: Easy with a rather dim companion. The color seemed a bit more intense than in the 6-inch refractor. A: lovely pale orange; B: grey-bluish.
Uwe Pilz Leipzig (Germany)	105mm (200x)	AC: der helle Stern ist weiß.
Uwe Pilz Leipzig (Germany)	105mm (288x)	AB waren schwieriger, als es die Daten vermuten ließen. C ist schwach und erforderte indirektes Sehen
Robert Zebahl Leipzig (Germany)	152mm (49x)	AC: Easy to separate with a significant difference in brightness. A appeared in bright orange, B appeared greyish-blue.
Robert Zebahl Leipzig (Germany)	152mm (129x)	AB: At 129x clearly elongated. Difference in brightness visible. The seeing was mediocre (3/5), so that the diffraction disks were only occasionally visible. At 180x no better.
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: widely separated with an orange A and bluish B

STTA63

6^m.5

7^m.7

75.2"

277°

2017

Aur

05^h30^m45.08^s / +39°49'33.30"

Robert Zebahl

Leipzig (Germany)

70mm (22x)

At 22x widely separated, visible difference in brightness. Slight difference in color: white-yellowish (at 44x light orange), slightly orange.

STF728, 32 Ori

4^m.4

5^m.8

1.3"

44°

2017

Ori

05^h30^m47.06^s / +05°56'53.30"

Uwe Pilz Leipzig (Germany)	105mm (288x)	sauber getrennt, Beugungsscheiben berühren sich gerade
Mark McCarthy Fremont (California/USA)	203mm (333x)	32 Ori White and off white pair, 1.5 delta mag, ~1.5". Nice and very clean with seeing

STF726

7^m.9

8^m.6

1.2"

264°

2016

Ori

05^h30^m51.75^s / +10°15'15.70"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very nice, unequal, ~1", 1 delta mag, very fine

STF729, 33 Ori

5^m.7

6^m.7

1.8"

26°

2017

Ori

05^h31^m14.53^s / +03°17'31.70"

Uwe Pilz

Leipzig (Germany)

105mm (180x)

Begleiter etwas außerhalb des ersten Rings

★

delta Ori, Mintaka

BU558

2^m.4

14^m.2

33.4"

229°

2016

Ori

05^h32^m00.40^s / -00°17'56.70"

STFA14

2^m.4

6^m.8

56.2"

4°

2017

René Merting Drachhausen (Germany)	10x50	AC: Komponente C zeigt sich gut abgesetzt im NW von A - Helligkeitsunterschied enorm, mindestens 3 Größenklassen
René Merting Drachhausen (Germany)	18x70	AC: total leicht - Komponente C thront gut getrennt nördlich über A (Mintaka) und ist gut 2 bis 3 Größenklassen schwächer (sogar 4.42 mag laut Stelle Doppie) und trotzdem noch ein mittelheller Stern - A ist gleißend weiß, C weißgrau
Christopher Hay Seeheim (Germany)	76mm (25x)	AC: C set off well from A. A pure white, C steel blue. Although in the middle of Orion the pair dominates the 3.1° FOV.
Uwe Pilz Leipzig (Germany)	105mm (22x)	AC: blau und violett
Uwe Pilz Leipzig (Germany)	105mm (200x)	AC: sehr weit in reichem Sternfeld
Uwe Pilz Leipzig (Germany)	105mm (288x)	AC: reinweiß-violett
Mark McCarthy Fremont (California/USA)	317mm (553x)	AC: Bright, 2 delta mag, very wide.

★

STF730

6^m.1

6^m.4

9.7"

142°

2019

Tau

05^h32^m14.14^s / +17°03'29.30"

Christopher Hay Seeheim (Germany)	10x56	On tripod. A very stretched figure-8. Clear brightness difference between the two ends of the 8.
Christopher Hay Seeheim (Germany)	15x45	Momentary split, coming and going, a fascinating sight. Quite white, nice together with Ruby Star 119 Tau in 4.5° FOV, and to southwest the fine star field of Collinder 65
Robert Zebahl Leipzig (Germany)	70mm (22x)	At 22x beautiful sight, easy to separate with little difference in brightness. A appeared slightly yellowish. At 57x moderate, but still very nice color contrast: A yellowish, B rather white.
Christopher Hay Seeheim (Germany)	76mm (23x)	Fine split. Attractive in 3.5° field of view together with luminous red Ruby Star 119 Tau.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Wide white stars, around 1 delta

STF718

7^m.5

7.7"

74°

2020

Aur

05^h32^m20.59^s / +49°23'36.50"

Robert Zebahl

Leipzig (Germany)

55mm (25x)

Easy to split with similarly bright components. Nive view.

BU1048

5^m.3

9^m.8

2.2"

355°

2015

Ori

05^h32^m41.35^s / -01°35'30.60"

René Merting

Drachhausen (Germany)

100mm (107x)

bei 107x zeigt sich Komponente B nur in ruhigen Momenten ganz schwach nördlich von A - Komponente A ist schön weiß, B kommt aufgrund des großen nicht abschätzbaren Helligkeitsunterschiedes ohne Farbe aus

STF734

6^m.7

8^m.2

1.6"

355°

2017

Ori

05^h33^m07.35^s / -01°43'02.50"

6^m.7

8^m.3

29.2"

243°

2019

René Merting Drachhausen (Germany)	100mm (20x)	AC: bei 32x sind beide Komponenten weit getrennt voneinander erkennbar - Komponente C im Westen ist gut 1.5 Magnituden schwächer - zurück auf 20x geben die beiden ein schönes schwaches Pärchen ab, Komponente A ist deutlich heller und es zeigt sich ein schöner Farbkontrast zwischen beiden Sternen - der DS selbst ist eher unauffällig im Sternumfeld
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Very close pair, delta mag 1, PA to north.

STF733

9^m.8

10^m.4

12.4"

41°

2017

Tau

05^h33^m28.27^s / +16°00'52.90"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint pair, well separated, around 1 delta mag. Physical

★

STF745

8^m.2

9^m.3

28.7"

347°

2014

Ori

05^h34^m49.12^s / -06°00'22.90"

8^m.2

10^m.4

97.1"

304°

2014

9^m.3

10^m.4

78.4"

290°

2015

René Merting

Drachhausen (Germany)

100mm (20x)

AB: bei 32x interessantes Doppelstern-Paar zusammen mit dem dicht stehenden STF747, der knallig hell daher kommt - Komponente A von STF745 ist noch deutlich schwächer, als die B-Komponente von STF747 - zurück auf 20x sind beide Komponenten schwach erkennbar und knapp getrennt
AC: bei 32x ist Komponente C nordwestlich von A in 2,5-facher Entfernung von AB leicht nach Westen abgeknickt zu erkennen

★

STF747 & CLL22 & HDS742

STF747

4^m.7

5^m.5

36.3"

224°

2019

Ori

05^h35^m02.68^s / -06°00'07.20"

CLL22

4^m.7

8^m.9

68.2"

12°

2000

HDS742

Ba-Bb

5^m.7

8^m.8

0.6"

120°

1991

Christopher Hay Seeheim (Germany)	7x45	STF747 (AB): Clearly split, with very distinct magnitude difference between A and B components. Hand tremor prevents detection of colour contrast, if there is one at all. A very pleasing tip to Orion’s Sword. A true physical pair according to Stelledoppie. Distance to us of 1610 light years could indicate membership of stellar association Orion OB1 and thus physical relationship to Orion nebula complex.
René Merting Drachhausen (Germany)	8x30	STF747 (AB): zwei helle Sterne knapp getrennt, Komponente B im Südwesten nur knapp schwächer
Christopher Hay Seeheim (Germany)	76mm (25x)	CLL22 (AC): Comellas (CLL) 22 is the C component of STF 747 AB. C is a fine pinprick of light, a little less than twice as far from A as B is. Knowing that this is a physical triple system makes a big difference in perceiving it as such at the eyepiece.
René Merting Drachhausen (Germany)	100mm (20x)	STF747 (AB): bei 32x zeigt sich B südwestlich von A gut eine halbe Größenklasse schwächer - B wirkt ein wenig kühler, bläulicher - zurück auf 20x, weiterhin leichte Trennung und Sichtbarkeit

STF738, lam Ori

3^m.5

5^m.5

4.3"

44°

2019

Ori

05^h35^m08.28^s / +09°56'03.00"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Meissa. White pair, 2 delta mag, ~5". Bright clean white [not physical]

★★★

theta 1 Ori, Trapezium, 41 Ori

6^m.5

7^m.5

8.9"

32°

2019

Ori

05^h35^m15.82^s / -05°23'14.30"

6^m.5

5^m.1

12.9"

133°

2019

7^m.5

6^m.4

19.4"

121°

2019

5^m.1

6^m.4

13.4"

62°

2019

6^m.5

11^m.1

4.6"

352°

2013

5^m.1

11^m.5

4.7"

120°

2013

Robert Zebahl Leipzig (Germany)	16x70	2021-02-24: Components A, C & D are clearly separable from each other. The fainter B component is almost completely outshone by A. The pair AB appears clearly elongated and is with concentrated observation in a few moments even visible separated.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2021-02-24: The different bright components A-D are clearly visible separated from each other.
Christopher Hay Seeheim (Germany)	71mm (32x)	13x: CD definitely split, A uncertain, B not present. 18x: A, C and D definite, B uncertain. 32x: A, B, C and D present and clear. Mediocre seeing but good transparency with strong M42 and an inkling of M43 at 32x. B is an eclipsing variable with a period of 6.5 days and an amplitude of 0.6mag, presumably obervation was at minimum, which would explain the difficulty in seeing it at lowest powers. C is the main source of excitation of the great Orion Nebula M42/43.
Winfried Kräling Marburg (Germany)	102mm (178x)
Jörg S. Schlimmer Germany	127mm (108x)	A-E split
Jörg S. Schlimmer Germany	305mm (170x)	A-F split

★★

STFA16, theta 2 Ori, 43 Ori

5^m.0

6^m.2

52.3"

94°

2019

Ori

05^h35^m22.88^s / -05°24'57.70"

5^m.0

8^m.5

128.5"

99°

2019

6^m.2

8^m.5

76.5"

102°

2019

Christopher Hay

Seeheim (Germany)

7x45

AB: On tripod. AB distinctly separate, very double-star-ish. Slightly wider separation than STF 747 AB two degrees to the south. Embedded in glow of M42. Theta 1 Ori (Trapezium) A/C/D appears slightly box-like without resolution.
Theta2 Ori is a physical double at a distance to us of 1546 light years.

DA4, 42 Ori

4^m.6

7^m.5

1.2"

202°

2018

Ori

05^h35^m23.16^s / -04°50'18.10"

Uwe Pilz

Leipzig (Germany)

105mm (260x)

Unregelmäßigkeit im ersten Ring, nicht eindeutig

★

STF752, 44 Ori, iota Ori, Nair Al Saif, Hatysa

2^m.8

7^m.7

12.5"

146°

2018

Ori

05^h35^m25.98^s / -05°54'35.60"

2^m.8

9^m.8

49.4"

103°

2002

7^m.7

9^m.8

41.1"

94°

2015

Christopher Hay Seeheim (Germany)	71mm (32x)	AB: Tight but clearly split, very large delta-mag. No success at 18x. Iota Ori is thought to be the original home of the runaway star AE Aurigae which currently excites the Flaming Star Nebula.
René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 64x tritt Komponente B gut getrennt aus dem Glanz von Komponente A hervor - mindestens 3 Magnituden Helligkeitsunterschied - A leicht gelblich, B braunorange - zurück auf 32x ist B in guten Momenten ganz knapp getrennt von A erkennbar AC: bei 64x zeigt sich Komponente C südöstlich von A - der Abstand von AC ist gut 4 bis 5x so groß wie Abstand AB - C ist dabei nochmal deutlich schwächer als B - zurück auf 32x ist C auch zu erkennen

STF750

6^m.4

8^m.4

4.2"

61°

2019

Ori

05^h35^m31.07^s / -04°21'50.60"

René Merting Drachhausen (Germany)	100mm (107x)	bei 107x präsentieren sich beide Komponenten knapp getrennt - B im Osten ist sehr schwach, gut 2 Magnituden schwächer als A
Uwe Pilz Leipzig (Germany)	105mm (192x)	mit 60mm trennbar

XMI9

7^m.9

9^m.7

30.1"

60°

2015

Tau

05^h35^m44.56^s / +18°45'29.30"

René Merting

Drachhausen (Germany)

18x70

eine echte Herausforderung - Komponente B taucht mit etwas Konzentration ganz schwach östlich von A auf, der Abstand ist ordentlich - B ist schätzungsweise 1.5 bis 2 Größenklassen schwächer - Komponente A strahlt schneeweiß, B wirkt wegen des Helligkeitsunterschiedes grau

STF751

8^m.0

9^m.0

15.1"

123°

2015

Ori

05^h35^m48.03^s / -00°59'12.80"

René Merting

Drachhausen (Germany)

18x70

mit etwas Geduld ist ein ganz knapp getrenntes schwaches Pärchen erkennbar - Komponente B im SO von A ist vielleicht eine dreiviertel Größenklasse schwächer

★

STF742

7^m.1

7^m.5

4.2"

275°

2019

Tau

05^h36^m26.38^s / +21°59'35.10"

Located about 0.5 degree east of Messier 1.

Christopher Hay Seeheim (Germany)	76mm (83x)	Just split. A little difficult. Suprisingly more difficult than STF572 about 15° to the northwest, although the numbers are very similar and the two systems are standing at identical elevation above horizon. At 40x STF742 is no longer definitely split, but M1 half a degree to the west is strong in 2° FOV by way of compensation.
Robert Zebahl Leipzig (Germany)	102mm (62x)	Beautifully separated, relatively tight with well visible difference in brightness. Points directly toward Messier 1 and can be observed with it in one field of view. Very nice!
Robert Zebahl Leipzig (Germany)	120mm (48x)	Nice, evident double near Messier 1. Easy to split with almost equally bright components.
Robert Zebahl Leipzig (Germany)	152mm (69x)	At 49x just so, at 69x easily separable. The fainter component appeared a little warmer in terms of color. Great view together with Messier 1 in the field of view.
Robert Zebahl Leipzig (Germany)	200mm (80x)	Nice double star with nearly equally bright components.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Well separated, ~1 delta mag white stars. Physical with 2959-year period

STF754

5^m.7

9^m.2

5.3"

288°

2002

Ori

05^h36^m35.69^s / -06°03'53.10"

René Merting

Drachhausen (Germany)

100mm (107x)

bei 107x zeigt sich Komponente B als kleine angeklebte Murmel westlich von A - höher vergrößern hat Seeing-technisch in dieser Nacht nichts mehr gebracht

STF736

7^m.5

8^m.6

2.7"

0°

2019

Aur

05^h37^m07.20^s / +41°49'41.70"

Robert Zebahl

Leipzig (Germany)

70mm (57x)

At 57x split with almost no space in between. At 100x clearly split with noticeable fainter component.

STF749

6^m.5

1.1"

324°

2019

Tau

05^h37^m08.84^s / +26°55'28.30"

6^m.5

10^m.5

181.6"

299°

2011

Robert Zebahl Leipzig (Germany)	70mm (133x)	AB: I had the impression that in the correct position angle, without knowing that angle during observation, a minimal elongation could be detected. But observation is borderline and too doubtful.
Mark McCarthy Fremont (California/USA)	203mm (333x)	AB: Lovely near equal pair, close around 1", like distant headlights, slightly blue-green white color. Physical with 773.2358-year period
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Hair-split, equal brightness white stars. Nice.

★★

STF757 & STF758 & S493

STF757

8^m.0

8^m.3

1.5"

242°

2018

Ori

05^h38^m06.52^s / -00°11'03.50"

STF758

8^m.0

8^m.7

51.4"

88°

2015

STF758

8^m.0

8^m.5

41.7"

80°

2015

S493

8^m.0

8^m.7

138.3"

263°

2015

STF758

8^m.7

8^m.5

11.4"

298°

2015

Uwe Pilz Leipzig (Germany)	120mm (250x)
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF757 (AB): Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF757 (AB): Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF757 (AB): Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC

★★

STF761

7^m.9

8^m.4

68.1"

202°

2016

Ori

05^h38^m36.54^s / -02°33'12.70"

7^m.9

8^m.6

72.1"

209°

2016

7^m.9

11^m.8

32.7"

308°

2016

8^m.4

8^m.6

8.5"

269°

2015

Christopher Hay Seeheim (Germany)	30x80	B-C fine split, C appears slightly weaker than B. Component A is too far away at this power from BC to feel that it belongs. Very attractive ensemble overall in the same field of view with Sigma Ori, which also presents three of its components.
René Merting Drachhausen (Germany)	100mm (32x)	A-BC: bei 32x stehen südlich von Komponente A in ordentlichem Abstand die Komponenten B (und C) BC: bei 32x sehe ich zwei dicht zusammen stehende gleich schwache Sterne, knapp getrennt
Uwe Pilz Leipzig (Germany)	320mm (80x)	B und C sind deutlich orange. In der Zeichnung ist STF 961 fälschlicherweise mit STF 791 bezeichnet. Im selben Feld wie Sigma Orionis

★

26 Aur, STF753

AB-C

5^m.5

8^m.4

12.4"

269°

2019

Aur

05^h38^m38.10^s / +30°29'32.80"

Christopher Hay Seeheim (Germany)	15x60	On tripod. Very stretched figure-8, does not actually resolve. Essential to focus the binoculars on some other star.
Robert Zebahl Leipzig (Germany)	70mm (22x)	Separable at 22x, but quite close together and pretty uneven. Primary component appeared in bright orange. At 57x easy to separate. The faint companion appeared silvery-blue.
Christopher Hay Seeheim (Germany)	76mm (40x)	C clearly set off from AB. AB is yellow, no particular colour seen on C. AB (also known as BU 1240) is a physical double at 566 light years distance to us. So is AB-C according to Stelledoppie, making this a physical triple system.
Uwe Pilz Leipzig (Germany)	105mm (88x)	heller Stern blauweiß
Christopher Hay Seeheim (Germany)	180mm (113x)	Wide split. Yellow-blue collour contrast of AB to C. Neither of the two colours very strong on its own, but in fine contrast to the other. Reminiscent of the way Polaris appears in a 3-inch at 40x, with less delta-mag, making it easier, but lacking Polaris' dramatic blue of the companion.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Bright yellow AB and a fainter yellow white C.

★★★

sigma Ori, 48 Ori

BU1032

4^m.1

5^m.3

0.3"

77°

2015

Ori

05^h38^m44.77^s / -02°36'00.20"

STF762

AB-C

3^m.8

8^m.8

11.4"

239°

2019

STF762

AB-D

3^m.8

6^m.6

12.9"

84°

2019

STF762

AB-E

3^m.8

6^m.3

41.4"

62°

2019

STF762

6^m.6

8^m.8

23.8"

252°

2019

STF762

6^m.3

8^m.8

52.9"

242°

2019

STF762

6^m.3

6^m.6

29.8"

233°

2019

STF3135

AB-F

3^m.8

7^m.9

208.0"

324°

2016

Christopher Hay Seeheim (Germany)	10x42	Binoculars with internal stabilisation, handheld. AB-D: No split, nor any elongation of AB towards D seen. AB-E: E is set off well from AB but harder to split than the numbers would suggest. This is partly due to the major delta-mag, and partly to the circumstance that D effectively reduces the "free" stretch of sky to 29". STF761 is a nice complement a few minutes of arc to the west and makes the visual impression of possibly belonging to the Sigma Ori complex, but Stelledoppie doesn't confirm this.
Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. AB-D: No split acheived. However, focussing on AB feels uncertain, presumably due to disturbance by D. Also not split with 15x60 on tripod. AB-E: E is set off well from AB.
Christopher Hay Seeheim (Germany)	25x80	AB-D: D is set off nicely from AB and appears very slightly on the orange side, particularly in contrast to E.
René Merting Drachhausen (Germany)	100mm (64x)	AB-C: bei 64x zeigt sich Komponente C ganz schwach südwestlich von AB AB-D: bei 32x schließt sich an die zartgelbe Komponente AB unmittelbar im Osten dicht stehend D weißorange an - ein schickes Trio zusammen mit E weiter östlich AB-E: bei 32x zeigt sich in vierfacher Entfernung von AB-D die Komponente E weiter östlich in einer Linie - E ist ähnlich hell wie D
Sarah Gebauer Germany	150mm (125x)	ein sehr schönes Muster des Mehrfachsystems, auch wenn längst nicht alle Komponenten getrennt zu sehen waren, AB-C, AB-D und AB-E getrennt, A und B nicht
Uwe Pilz Leipzig (Germany)	320mm (80x)	AB-C-D schon im Aufsuchokular sichtbar. Sehr lebhafte Farben, einer der schönsten Mehrfachsterne überhaupt. Im selben Feld mit STF761

STF755, 124 Tau

8^m.9

9^m.5

6.2"

318°

2015

Tau

05^h39^m09.17^s / +23°17'17.70"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Approximately 1 delta mag, pretty wide around 6". Physical

HDO77

6^m.9

7^m.9

10.9"

124°

2017

Lep

05^h39^m44.71^s / -20°26'06.70"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x ein schickes enges Sternpaar, knapp getrennt - leichter Farbkontrast, Komponente B im SO ist orangebraun, A dagegen ist doppelt so hell und strahlt weiß

AG99

9^m.6

10^m.2

7.6"

144°

2018

Tau

05^h40^m02.73^s / +22°32'06.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint pair, around 1 delta mag, pretty wide approximately 8". Physical

STF774, zeta Ori, 50 Ori, Alnitak

1^m.9

3^m.7

2.4"

167°

2017

Ori

05^h40^m45.52^s / -01°56'33.30"

1^m.9

9^m.6

58.5"

10°

2017

Robert Zebahl Leipzig (Germany)	70mm (128x)	AB: Big difference in brightness. I could see the fainter component near the first ring of the Airy pattern of the brighter component.
Winfried Kräling Marburg (Germany)	102mm (178x)	AB
Uwe Pilz Leipzig (Germany)	105mm (288x)	AB: sauber getrennt, Beugungsscheiben berühren sich gerade
Mark McCarthy Fremont (California/USA)	203mm (333x)	AB: Alnitak. Easy, 2 delta mag,~2", white
Mark McCarthy Fremont (California/USA)	317mm (207x)	AC: Alnitak:AC is a very faint star widely separated outside of the main star's glare.
Mark McCarthy Fremont (California/USA)	317mm (207x)	AB: about 2" and 1.5 delta mag.

★★

STF764

6^m.4

7^m.1

25.8"

15°

2019

Aur

05^h41^m20.98^s / +29°29'14.70"

Christopher Hay Seeheim (Germany)	7x50	On tripod. PA very clear and the pair splits apart in good moments. Keeping Alnath (Beta Tau) out of the FOV helps. Chi Aur is in a nice little arc of stars on north-western edge of FOV, enhances the aesthetics of the field of view.
Robert Zebahl Leipzig (Germany)	8x44	2020-11-25: Cleanly split, rather close together. In beautiful star field together with beta Tauri.
Christopher Hay Seeheim (Germany)	15x60	On tripod. Distinctly split, attractive sight in light orange and light blue, a visually strong pair. 26 Aur (STF753, not quite split) in same 3.3° field of view.
Christopher Hay Seeheim (Germany)	25x80	Well split. Brighter star honey-yellow, companion ice-blue. Very similar brightnesses. A visually strong, compact pair at this power in 3.2° field of view.
Robert Zebahl Leipzig (Germany)	55mm (25x)	Easy to split with large distance and noticeable difference in brightness.
Robert Zebahl Leipzig (Germany)	70mm (22x)	Very easy and bright, pretty wide apart with a small difference in brightness; whitish and slightly yellowish.
Christopher Hay Seeheim (Germany)	76mm (40x)	Well separated, even brightness of components. A appears immediately orangish, B bluish, but after a minute of observation this impression fades to colourlessness.
Uwe Pilz Leipzig (Germany)	105mm (88x)	blauweiß und orange, kleiner aber gut sichtbarer Helligkeitsunterschied. Schon bei 21x sichtbar, sehr lohnend.
Christopher Hay Seeheim (Germany)	180mm (113x)	Wide apart but a strong pair with slight delta-mag. Mild orange-to-blue colour contrast of A to B that remains stable in contrast to 76mm observation in same night.
Mark McCarthy Fremont (California/USA)	317mm (277x)	two bright whites widely separated

BU1052

6^m.7

8^m.2

0.7"

183°

2019

Ori

05^h41^m40.34^s / -02°53'47.30"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Suspected at 333x, easily split with 533x & apodising mask, light orange stars approximately 1.5 delta. Short period with 105.692-year period. Burnham discovered with the 36-inch at 0.7". Currently at apastron, close to the discovery separation, it will be difficult to notice change in the next 20 years, but after 2050 it will close rapidly

FOX142

8^m.8

11^m.5

5.9"

100°

2015

Ori

05^h42^m10.57^s / +13°35'30.70"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Attractive white star and around 3 delta mag light red B, around 6"

STF776

8^m.5

9^m.8

2.6"

98°

2019

Tau

05^h43^m03.19^s / +25°21'47.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Fine pair, very close, almost 2 delta mag, B seems slightly red. Physical

STF777

9^m.3

9^m.8

4.7"

84°

2019

Tau

05^h43^m20.78^s / +22°12'45.70"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

White pair, well split, significant delta mag. Physical

STF778

8^m.4

10^m.1

3.5"

186°

2015

Aur

05^h44^m05.16^s / +30°56'01.80"

Mark McCarthy Fremont (California/USA)	317mm (277x)	double squeezed into the FOV with STF 789 at 277x, AB is a widely separated 4 delta mag pair
Mark McCarthy Fremont (California/USA)	317mm (277x)	double squeezed into the FOV with STF 789 at 277x, AC is a widely separated 4 delta mag pair, same brightness as B

★★

gamma Lep, 13 Lep

H6 40

3^m.6

6^m.3

95.5"

349°

2019

Lep

05^h44^m27.79^s / -22°26'54.20"

H5 50

6^m.3

11^m.4

112.1"

8°

1999

Christopher Hay Seeheim (Germany)	6x30	On tripod. Clearly separated. B appears bluish.
Christopher Hay Seeheim (Germany)	7x45	On tripod. Clearly separated. Large delta-mag plus scintillation of primary prevent colour perception of B. The 6x30 binoculars show the colour better in the same night. Interesting to note that the 7x45 is at a disadvantage in this regard while the 10x56, however, is superior.
Christopher Hay Seeheim (Germany)	10x56	On tripod. Widely separated. Rather charming. B distinctly blue. Scintillation plus atmospheric dispersion of A (15° above horizon) prevent determination of any particular hue of A. A physical double at a distance to us of only 29 light years, which means Gamma Leporis is in our immediate galactic neighbourhood.
René Merting Drachhausen (Germany)	12x42	ein Augenöffner und sehr imposanter, heller Doppelstern - B steht weit abgesetzt im Norden von A und ist gut 1.5 Magnituden schwächer (2.64 mag laut Stelle Doppie) - B wirkt bräunlich weiß gegen die strahlend weißgelbe Komponente A
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x wunderschön - Komponente A strahlt gleißend gelb, Komponente B extrem weit im NNW ist gut 2 Größenklassen schwächer - viele schwächere Sterne im unmittelbaren Umfeld, sie gehören aber nicht mit zum System

STF783

8^m.1

9^m.7

8.3"

0°

2015

Aur

05^h44^m37.74^s / +29°00'59.70"

Uwe Pilz

Leipzig (Germany)

105mm (288x)

schwierig, weil schwach. Heller Stern gelblich

../projects/double-stars/uwe-pilz/sketches/200117stf783.jpg

STF789

6^m.1

10^m.2

14.0"

150°

2017

Ori

05^h45^m01.80^s / +04°00'29.30"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Wide, 3 delta mag, ~15", B looks blue. [did not notice BC, A 2655, 13.7 mag B 1.1"]
Mark McCarthy Fremont (California/USA)	317mm (277x)	Widely separated 4 delta mag pair, in same FOV as STF 778

STF785

7^m.3

8^m.3

14.7"

347°

2015

Tau

05^h45^m55.39^s / +25°54'49.30"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

White, wide more than 1 delta mag

BU560

7^m.8

8^m.2

1.7"

124°

2019

Aur

05^h47^m24.87^s / +29°39'26.90"

Robert Zebahl Leipzig (Germany)	70mm (100x)	Clearly visible as a double star with overlapping diffraction disks (figure '8') and small difference in brightness.
Robert Zebahl Leipzig (Germany)	152mm (129x)	Separated with very little difference in brightness, relatively tight. Overall easy.

BU91

8^m.1

10^m.6

1.5"

91°

2009

Tau

05^h47^m38.44^s / +20°56'26.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very nice, can see B even with low magnification, it appears as a faint point clearly separated from A and much fainter. Burnham discovered with 6-inch

STT119

8^m.1

8^m.9

0.7"

355°

2009

Ori

05^h47^m54.88^s / +07°57'37.50"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Suspect elongations with 8" 533x & 20" 533x, but image not good enough. But I got a nice clean split with apodizing mask, nearly perfrect disks. Orange stars well split, <1", about 1 delta mag

BU1402

8^m.4

12^m.4

10.8"

341°

2015

Ori

05^h47^m58.29^s / +12°03'55.90"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

B just appears direct vision & brightens with averted, white A, nice small pair. Not physical. Discovered with the 40-inch at 9.5"

STF795, 52 Ori

6^m.0

1.0"

221°

2019

Ori

05^h48^m00.21^s / +06°27'14.50"

Sarah Gebauer Germany	150mm (125x)	bei 125x und 250x nicht getrennt im April 2020
Mark McCarthy Fremont (California/USA)	317mm (553x)	Bright white, near equal magnitude, near touching disks hairline split
Mark McCarthy Fremont (California/USA)	508mm (533x)	52 Ori. Close but well split, near equal, ivory white. with apodising mask

STF798

7^m.3

9^m.5

21.2"

182°

2017

Ori

05^h48^m10.42^s / -08°23'01.10"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x muss ich schon sehr genau hinschauen, dann erkenne ich B südlich von A, ordentlich getrennt - die B-Komponente ist gut 2 Magnituden schwächer - A warmweiß, B dagegen kupferbraun

★★

STT117

7^m.1

10^m.0

11.7"

31°

2015

Aur

05^h48^m11.46^s / +30°32'06.70"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

bright yellow A and a small faint B. Carbon star to the west in FOV. Lovely, colorful field.

STF797

7^m.4

9^m.8

7.3"

17°

2015

Ori

05^h48^m28.21^s / +04°42'14.00"

Mark McCarthy Fremont (California/USA)	317mm (277x)	Yellow and red, 2 delta mag, PA to north.
Mark McCarthy Fremont (California/USA)	508mm (205x)	Typical Struve, wide, two delta... nice pair

BU93

10^m.3

12^m.1

6.1"

162°

2014

Tau

05^h48^m57.66^s / +21°00'43.70"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

B is very widely separated from A, and BC forms a faint pair approximately 6", seen with direct vision, though C brightens with averted. Burnham discovered with 6-inch when the separation was only 2"

STF3115

6^m.5

7^m.5

0.9"

337°

2017

Cam

05^h49^m04.64^s / +62°48'29.60"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

gerade eben trennbar mit schwarzem Zwischenraum

../projects/double-stars/frederik-wanink/sketches/STF3115.jpg

STF796

7^m.2

8^m.2

3.7"

62°

2019

Aur

05^h49^m55.53^s / +31°47'08.70"

Robert Zebahl Leipzig (Germany)	55mm (83x)	Well split with noticeable fainter companion.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Pretty yellow and faint blue

STF791

9^m.1

10^m.0

5.0"

91°

2019

Aur

05^h50^m03.41^s / +39°34'34.70"

9^m.1

11^m.2

60.7"

214°

2015

Uwe Pilz

Leipzig (Germany)

16x70

../projects/double-stars/uwe-pilz/sketches/200918stf79.jpg

HU40

9^m.1

10^m.1

3.8"

18°

2019

Ori

05^h51^m08.25^s / +20°08'21.50"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Light orange A and two delta B, around 4" separation

★

STF805

8^m.4

8^m.9

12.1"

50°

2015

Tau

05^h51^m48.20^s / +28°26'59.60"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein schwaches Paar - Komponente B zeigt sich knapp abgesetzt im NO von A und ist eine halbe Größenklasse schwächer - unauffällig trotz scheinbarer Sternarmut im Umfeld
Uwe Pilz Leipzig (Germany)	105mm (88x)	schwach, aber lohnend, gelb und blaugrau

HU448

9^m.2

11^m.1

2.5"

238°

1991

Ori

05^h51^m53.76^s / +20°37'07.70"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Blue-white, nearly 1 delta, pretty well split

STF799

7^m.3

8^m.3

0.8"

158°

2013

Aur

05^h52^m13.88^s / +38°33'36.40"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	sehr schwierig, eher geraten
Mark McCarthy Fremont (California/USA)	317mm (270x)	Hairline split but definite in the best moments, white, half delta mag.

★★

BU1053

6^m.9

8^m.8

1.9"

0°

2019

Aur

05^h53^m28.64^s / +37°20'20.70"

Robert Zebahl Leipzig (Germany)	70mm (133x)	Border observation! Companion is temporarily visible in the correct position angle as an extremely dim brightening of the first diffraction ring of the primary component.
Mark McCarthy Fremont (California/USA)	317mm (270x)	Nice!! Blazing white and close but nicely split light blue B, 2 delta mag.

STT123

7^m.3

9^m.1

2.1"

187°

2012

Ori

05^h54^m09.53^s / +10°14'39.40"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Orange A and blue B, ~2.5", 2 delta mag

STF813

8^m.8

9^m.0

3.1"

150°

2019

Ori

05^h54^m22.37^s / +18°54'01.60"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Blue-white pair, near equal, approximately 4"

BU563

8^m.0

11^m.1

6.7"

186°

2017

Ori

05^h54^m37.44^s / +15°30'27.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

B is wide, approximately 7", just visible with direct vision, brightens with averted

HO20

6^m.8

11^m.8

8.1"

279°

2016

Ori

05^h54^m55.20^s / +14°13'11.60"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

B seen with direct vision, very faint, very large delta mag, both yellowish stars

STF816

6^m.9

9^m.3

4.1"

290°

2014

Ori

05^h54^m55.46^s / +05°51'38.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

White and orange, 3 delta mag, PA WNW.

A2658

10^m.2

10^m.3

0.4"

73°

1995

Ori

05^h55^m00.02^s / +06°13'21.50"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Hairline split, near equal pair, faint. With apodizing mask

STF818

9^m.8

10^m.1

5.9"

277°

2014

Ori

05^h55^m19.45^s / +04°42'49.80"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Fairly faint, wide, slightly blue, a small mag delta

MIL2

7^m.1

14^m.5

11.8"

232°

2015

Aur

05^h55^m22.26^s / +29°57'50.20"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

A white A and slightly ruddy B, easy.

★

TDS3427

11^m.0

11^m.3

1.3"

43°

2015

Ori

05^h55^m34.58^s / +18°44'56.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Wow! very fine, near equal faint pair, nicely split. I'm really surprised it wasn't discovered before since any one of the greats could have seen it -- I wonder if it is a physical binary and was at periastron 75-150 years ago, and only now coming to view?

STF820

9^m.1

9^m.8

5.1"

110°

2019

Ori

05^h55^m42.95^s / +08°58'57.90"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Pretty orange A and light orange B, wide, about 2 delta mag

A2439

9^m.3

10^m.6

2.3"

146°

2009

Ori

05^h56^m49.63^s / +18°22'12.20"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Approximately 1 delta mag, and around 3", not difficult

HU449

9^m.5

12^m.7

3.1"

342°

2008

Ori

05^h56^m53.56^s / +21°20'35.10"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

B revealed with averted vision, and I can hold it direct with foveal coaxing

ARG63

8^m.7

9^m.1

32.5"

67°

2014

Ori

05^h57^m08.58^s / +10°13'45.70"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Wide, half delta mag. unremarkable [however it is a physical pair 432 LY away. A is a 0.5" pair with 12th mag B, worth a try on Challenger.]

BU1189

9^m.3

10^m.3

0.2"

338°

1977

Ori

05^h57^m27.59^s / +00°23'58.50"

AB-C

8^m.0

8^m.3

56.1"

194°

2015

René Merting

Drachhausen (Germany)

18x70

AB-C: auffällig, zwei mittelhelle Sterne, die weit auseinander stehen - Komponente B im Süden ist knapp eine halbe Größenklasse schwächer

COU376

10^m.6

11^m.0

0.8"

297°

1992

Ori

05^h58^m12.15^s / +20°55'22.30"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Very faint, slightly unequal, most of the time an elongated smudge but resolve with seeing

★★★

59 Ori

H5 100

5^m.9

10^m.4

36.7"

206°

2015

Ori

05^h58^m24.44^s / +01°50'13.60"

ARN37

5^m.9

6^m.9

177.8"

293°

2015

Christopher Hay Seeheim (Germany)	7x45	AC: Handheld: AC wide apart and immediately striking as double star. On tripod: Wide apart but still very double-star-ish. C appears light blue. Arnold 37 is a physical double at a distance to us of 364 light years.
Christopher Hay Seeheim (Germany)	15x45	AC: AC wide apart but holding together visually as strong pair in 4.5° FOV. C distinctly blue, A appears slightly orange in contrast.

STT124

6^m.1

7^m.4

0.6"

299°

2018

Ori

05^h58^m53.23^s / +12°48'29.80"

Mark McCarthy Fremont (California/USA)	317mm (170x)	Seeing not good. Bloated yellow star with bluish B just attached to the edge, like a wart. B is very faint, small.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Briefly split in the best moments, 1 second out of 10. A star yellow-white and small, hard blue B.

STT126

8^m.0

10^m.7

10.7"

61°

2019

Ori

05^h59^m24.50^s / +17°48'53.10"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Wide, three delta mag, yellow-white A and faint white B star

★

STT125

7^m.9

8^m.9

1.4"

0°

2015

Ori

05^h59^m42.46^s / +22°28'15.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Yes, I have the split! White stars, a half delta mag, close but very clean separation. Nice

STT545, 37 Aur, theta Aur

2^m.6

7^m.2

4.2"

304°

2019

Aur

05^h59^m43.24^s / +37°12'45.90"

Robert Zebahl

Leipzig (Germany)

70mm (57x)

At 57x nothing seen at first sight. At 133x the much fainter component was visible after a short time as a tiny star in the correct po