Double Stars - Sketches

A detailed description of the project, the data sources, additional websites and how you can contribute visual observations and photographs of double stars to the project are summarized in our introduction.

Double Star Lists:

Complete List (Index)

Sketches (Index)
Photographs (Index)

Orbits (Index)

Double/Multiple Stars	389
Visual Observations	1635
Sketches	525
Photographs	54
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°

2019

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

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

95.2"

238°

2020

10^m.1

10^m.6

113.1"

227°

2015

René Merting Drachhausen (Germany)	76mm (29x)	AB-C: bei 29x ist nördlich von AB eine ganz schwache Komponente erkennbar, gut getrennt - AB wirkt leicht gelblich, C eher kupfer-grau
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
René Merting Drachhausen (Germany)	320mm (45x)	AB-C: bei 45x ist Komponente C im Norden gut abgesetzt von AB zu erkennen - Helligkeitsunterschied 2-3 Größenklassen - AB ist weiß-gelblich, C wirkt kupfer-grau

STT547

9^m.0

9^m.2

5.9"

191°

2021

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

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

★

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

STF3

7^m.8

9^m.1

5.1"

83°

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)

★

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

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%
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x weit getrennt - A strahlt in einem sehenswerten pastellgelb, B ist viel schwächer und wirkt grau-weiß

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

55.2"

356°

2016

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
René Merting Drachhausen (Germany)	320mm (45x)	AB: bei 45x ist Komponente B weit abgesetzt südlich von der weiß glänzenden A-Komponente zu erkennen - B ist mindestens 2.3 bis 3.0 Magnituden schwächer

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

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
Robert Zebahl Leipzig (Germany)	152mm (30x)	AB: 2022-10-25: Fairly widely separated, as a double star moderately conspicuous with little difference in brightness. Colorwise the double star is convincing: light orange & light blue.
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

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	2018-10-09: Large distance with visible difference in brightness. I used a tripod.
Robert Zebahl Leipzig (Germany)	12x42	2022-10-19: Medium bright, nicely separated and well recognizable as a double star in the field. The components appear similarly bright. Light orange & slightly bluish.
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)	12x42	ein sehr interessantes Paar, das isoliert zwischen einigen helleren Sternen steht - die Trennung der beiden etwa gleich hellen Komponenten ist ordentlich ordentlich - zwischen beiden Sternen findet ein ganz eigenartiges Farbspiel statt, die Farben sind nicht wirklich richtig auszumachen, aber es gibt definitiv einen Farbunterschied
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.

★★

eta Cas, 24 Cas

STF60

3^m.5

7^m.4

13.6"

326°

2020

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

★★

STF73, 36 And

6^m.1

6^m.5

1.2"

335°

2020

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

STT21

6^m.8

8^m.1

1.3"

176°

2020

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

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

STT515, phi And, 42 And

4^m.6

5^m.6

0.5"

114°

2021

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

★

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

★

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.

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

10.2"

223°

2016

AB-D

7^m.2

10^m.8

23.6"

58°

2016

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

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"

★

STF154

8^m.6

8^m.8

5.1"

127°

2020

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)

★★

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.

★

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.
René Merting Drachhausen (Germany)	320mm (144x)	bei 144x zeigt sich ein knapp getrenntes Pärchen - A im Norden mit leichtem Gelbstich, B ist eine halbe Magnitude schwächer und strahlt blau-weiß

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

★★

H5 12, 9 Ari, lambda Ari

4^m.8

6^m.7

37.3"

48°

2020

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.
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x ein wunderschönes, sehr helles Farbkontrastpaar, A ist gelb-weiß, B im Nordosten ist gut 1.5 Magnituden schwächer und grau-weiß - Trennung mehr als komfortabel

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

★

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

9.5"

63°

2021

And

02^h03^m53.92^s / +42°19'47.50"

BAR22

2^m.3

15^m.0

27.9"

245°

1898

STT38

5^m.3

6^m.5

0.3"

120°

2021

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.
René Merting Drachhausen (Germany)	76mm (29x)	A-BC: bei 29x äußerst knapp getrennt - Komponente A strahlt buttergelb, BC schmiegt sich im Nordosten an
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

★★★

STF227, iota Tri, 6 Tri

5^m.3

6^m.7

4.0"

68°

2019

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!

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.

★★

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

★★

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)	12x42	AB: 2022-10-19: Easy to split at moderate separation and small difference in brightness. Well visible color difference, although it is difficult to assign the color to the components: white-bluish & yellow-orange.
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

★

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

3.9"

302°

2016

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.

gamma Cet, 86 Cet, Kaffaljidhma

STF299

3^m.5

6^m.2

1.9"

299°

2020

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

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

3.2"

118°

2018

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

★

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

★

STF333, eps Ari

5^m.2

5^m.6

1.4"

210°

2020

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

STF341

7^m.6

10^m.0

8.7"

221°

2016

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

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.

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.

★★

STF401

6^m.6

6^m.9

11.4"

269°

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.

★

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

★★★

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

STF471, epsilon Per, 45 Per

2^m.9

8^m.9

8.8"

12°

2020

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

★

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

★

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!

STF546

7^m.9

9^m.2

7.0"

182°

2021

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.

★★

STF559

7^m.0

3.1"

275°

2021

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

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

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

★★

STF616, omega Aur, 4 Aur

5^m.0

8^m.2

4.7"

5°

2019

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

★

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

0.3"

88°

2013

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

★★

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.

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

9.2"

202°

2020

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"

★★

STF653, 14 Aur

5^m.0

10^m.9

8.9"

11°

2017

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.]

STF681

6^m.6

9^m.2

23.2"

183°

2020

Aur

05^h20^m39.16^s / +46°57'49.60"

René Merting Drachhausen (Germany)	15x56	Komponente B zeigt sich leicht abgesetzt südlich von A und ist gut 2.5 bis 3 Magnituden schwächer - der Glanz von Kapella stört die Beobachtung enorm
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

★

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.

★

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.

★★

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

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

★

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.

★★★

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

6^m.5

11^m.1

4.6"

352°

2013

7^m.5

6^m.4

19.4"

121°

2019

5^m.1

6^m.4

13.4"

62°

2019

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

★★

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"

70°

2018

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

STF3135

AB-F

3^m.8

7^m.9

208.0"

324°

2016

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

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

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

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

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

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

★

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

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 position angle. With this knowledge, the observation at 57x was also successful, even if one has to look very closely. The challenge here is not so much the angular distance as the large difference in brightness.
Uwe Pilz Leipzig (Germany)	105mm (200x)	blauweiß. Wegen der etwas unruhigen Luft und des Helligkeitsunterschiedes nicht einfach.
Mark McCarthy Fremont (California/USA)	178mm (222x)	Brilliant white A and light orange B, which is very much fainter and on the outside of A's third diffraction ring. A is causing a lot of diffraction in average to poor seeing. Physical with a 473 year period, it is now near apastron and will hang there for the rest of my lifetime

BU16, 3 Mon

5^m.0

8^m.0

2.0"

354°

2016

Mon

06^h01^m50.42^s / -10°35'52.60"

Uwe Pilz Leipzig (Germany)	105mm (260x)	schwache Aufhellung im ersten Ring
Uwe Pilz Leipzig (Germany)	105mm (288x)	Begleiter schwach

BU17

6^m.9

9^m.3

3.6"

192°

2019

Mon

06^h08^m25.39^s / -11°08'46.60"

6^m.9

10^m.8

10.2"

260°

2015

9^m.3

10^m.8

9.3"

276°

1998

Uwe Pilz

Leipzig (Germany)

105mm (288x)

Dreifachstern! (Burnham 17)

../projects/double-stars/uwe-pilz/sketches/bu17.jpg

STT134 & WAL42

STT134

7^m.5

9^m.1

31.2"

189°

2016

Gem

06^h09^m15.94^s / +24°25'40.30"

WAL42

7^m.5

12^m.6

43.8"

251°

2015

Located in the northern part of Messier 35.

René Merting Drachhausen (Germany)	100mm (32x)	STT134 (AB): bei 32x zeigt sich südlich von A ein gut 1.5 Magnituden schwächerer Begleiter - ein ordentlich getrenntes Pärchen - im Umfeld nicht sehr auffällig (logisch bei einem Doppelstern in M 35)
Uwe Pilz Leipzig (Germany)	120mm (360x)	STT134 (AB): in M35
Robert Zebahl Leipzig (Germany)	152mm (92x)	2022-02-27: At 30x the uneven pair AB appears widely separated. A shines in a glaring bright orange, B in the south appears slightly bluish. Then at 92x component D is also very faintly visible. All three components form an acute-angled, nearly isosceles triangle. Also at this magnification A appears bright orange, B gray-bluish. At 171x D still remains pretty faint.

BU1008, eta Gem, 7 Gem, Propus

3^m.5

6^m.2

1.8"

258°

2020

Gem

06^h14^m52.69^s / +22°30'24.60"

Uwe Pilz Leipzig (Germany)	105mm (260x)	Aufhellung im ersten Ring
Uwe Pilz Leipzig (Germany)	105mm (288x)	sehr schwierig
Robert Zebahl Leipzig (Germany)	152mm (225x)	Already comparatively easy at 180x. The faint companion can be seen well as a quite distinct, slightly elongated, partly round brightening. At 225x and above it becomes easy and immediately apparent, even if the diffraction rings of the primary component are not permanently visible due to the seeing. The primary component was shining in a bright orange.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Propus. Yellow A and blue-yellow B, 2 delta mag, 1.5" very nice

★

STF900, epsilon Mon, 8 Mon

4^m.4

6^m.6

12.2"

30°

2019

Mon

06^h23^m46.10^s / +04°35'34.20"

Robert Zebahl Leipzig (Germany)	55mm (42x)	Relatively large distance and clear difference in brightness. The lighter component seemed white-yellowish, the weaker one slightly greenish-blue. The color contrast, however, was not particularly conspicuous.
Uwe Pilz Leipzig (Germany)	105mm (288x)	Blau-rot

SHJ70, 15 Gem

6^m.7

8^m.2

24.7"

203°

2019

Gem

06^h27^m46.58^s / +20°47'22.60"

6^m.7

12^m.7

85.6"

35°

2015

Robert Zebahl Leipzig (Germany)	16x70	AB: 2021-02-22: Clearly split with noticeable difference in brightness. Pale orange with much fainter companion. Together with Nu Gem & 16 Gem in a nice curved star chain.
René Merting Drachhausen (Germany)	18x70	AB: ein schönes enges Sternpaar, Komponente B ist SW ist ordentlich getrennt von A zu erkennen - etwas über eine Größenklasse Helligkeitsunterschied, dadurch leichter Farbkontrast
Uwe Pilz Leipzig (Germany)	105mm (88x)	AB: Auch bei 21x trennbar
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Very pretty orange A, with a brown B, ~1.5 delta mag.

★★★

beta Mon, 11 Mon

STF919

4^m.6

5^m.0

7.1"

133°

2019

Mon

06^h28^m49.07^s / -07°01'59.00"

STF919

4^m.6

5^m.4

9.9"

126°

2019

BU570

4^m.6

12^m.1

26.5"

56°

2014

STF919

5^m.0

5^m.3

3.0"

109°

2019

René Merting Drachhausen (Germany)	18x70	das Mehrfachsystem ist als 8 erkennbar, eine extrem knappe Berührung, wobei die Komponenten B und C im SO nur als ein Stern gesehen werden können - BC ist gleich hell wie A allein
René Merting Drachhausen (Germany)	100mm (32x)	A-BC: bei 32x ein wunderschöner eng stehender Doppelstern - die bei dieser Vergrößerung noch nicht trennbare Komponenten B und C im SO wirken leicht gelblich und ist leicht heller als A - die Komponenten A und BC wollen sich berühren, schaffen es aber nicht ;-) BC: bei 64x wirkt BC leicht länglich wie ein Stäbchen - bei 107x dann der Aha-Effekt, es sind zwei Sterne, knapp getrennt und mit gleichem Positionswinkel wie A-BC - beide Komponenten B und C sind gleich hell und einzeln jeweils etwa eine halbe Größenklasse schwächer als A im NW
Uwe Pilz Leipzig (Germany)	105mm (137x)	Dreifachsystem, drei fast gleichhelle Sterne. Alle blau-weiß

S524

7^m.2

7^m.4

53.0"

244°

2017

Gem

06^h34^m07.10^s / +22°07'27.20"

René Merting Drachhausen (Germany)	18x70	AB: popeleinfach mit dem FG - ein mehr als gut getrenntes Pärchen zweier gleich heller Sterne - die östliche Komponente wirkt ein klein wenig heller - A warmweiß, B blauweiß
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 32x zeigen sich zwei annähernd gleichhelle Sterne weit getrennt voneinander - Komponente B im SW wirkt kühler als A AC: bei 32x ist südöstlich von A in doppeltem Abstand wie AB eine weitere Komponente erkennbar - C ist mindestens 2 Größenklassen schwächer als B - alle drei Sterne bilden ein schönes rechtwinkliges Dreieck, wobei die Ecke von A den rechten Winkel bildet - zurück auf 20x ist C auch noch knapp sichtbar
Uwe Pilz Leipzig (Germany)	105mm (21x)	selbst bei 21x einfach zu erkennen
Robert Zebahl Leipzig (Germany)	152mm (30x)	2022-02-27: Pretty bright, wide double star with small difference in brightness. Both components appear white.

★★

STT147

A-CD

6^m.8

9^m.8

44.5"

119°

2016

Aur

06^h34^m19.37^s / +38°04'33.60"

6^m.8

8^m.7

42.7"

74°

2016

10^m.6

11^m.0

0.5"

109°

1957

Uwe Pilz Leipzig (Germany)	105mm (200x)
Robert Zebahl Leipzig (Germany)	152mm (69x)	At 22x, the components A, B and CD are immediately conspicuous, where A dominates. They form a beautiful, acute-angled triangle. At 69x, color differences are also visible. A: subtle orange; B: grey-bluish; CD: tendency to orange. Rewarding, because the double stars STF 928 & STF 929 as well as the very conspicuous carbon star UU Aur are in close proximity and can partly be observed together in one field of view!

★★

STF928

7^m.9

8^m.6

3.4"

131°

2019

Aur

06^h34^m41.81^s / +38°32'24.50"

7^m.9

12^m.4

130.9"

124°

2002

8^m.6

12^m.4

127.3"

124°

2015

Robert Zebahl Leipzig (Germany)	102mm (62x)	AB: At 28x the double star already appeared elongated, at 62x beautifully separated, with component A shining in a warm, subtle orange. At 125x A appeared orange, B grey-bluish.
Uwe Pilz Leipzig (Germany)	105mm (200x)	AB: kühl-weiß und lila
Robert Zebahl Leipzig (Germany)	152mm (69x)	AB: Clearly separated, but tight. Moderate difference in brightness. Nice view with the nearby double stars STT147 & STF 929 and the carbon star UU Aur!
Mark McCarthy Fremont (California/USA)	178mm (148x)	AB: Classic Struve, very lightly yellow-white stars, about 1 delta, well separated

STF922

7^m.7

10^m.8

9.5"

138°

2016

Cam

06^h38^m18.76^s / +64°44'06.00"

7^m.7

11^m.2

25.5"

9°

2016

Robert Zebahl

Leipzig (Germany)

70mm (100x)

2020-04-16: Component A looked slightly yellowish, components B & C appeared rather dim.

../projects/double-stars/robert-zebahl/sketches/2020-04-16_stf922.jpg

STT152, 54 Aur

6^m.2

7^m.8

0.8"

34°

2016

Aur

06^h39^m33.12^s / +28°15'47.40"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

schwierig, Luftunruhe

../projects/double-stars/frederik-wanink/sketches/STT152.jpg

★★

STF946

7^m.3

9^m.1

4.0"

129°

2019

Lyn

06^h44^m51.62^s / +59°26'57.40"

Robert Zebahl Leipzig (Germany)	102mm (86x)	Easy to split with noticeable difference in brightness. Very nice view together with the triple system STF 948 in one field of view!
Uwe Pilz Leipzig (Germany)	105mm (88x)	im selben Feld mit 12 Lyn
Robert Zebahl Leipzig (Germany)	152mm (100x)	At 100x and 129x easy to separate, quite uneven. Primary component appeared yellowish, the fainter one rather greyish. Fantastic view together with 12 Lyn (STF 948) in one field of view!

★★★

AGC1, 9 CMa, alpha CMa, Sirius

-1^m.5

8^m.4

11.2"

67°

2020

CMa

06^h45^m08.92^s / -16°42'58.00"

Uwe Pilz Leipzig (Germany)	105mm (198x)	mit ADV, ohne nicht trennbar. Eindeutig
Robert Zebahl Leipzig (Germany)	120mm (150x)	2021-03-02: Used magnifications from 86x to 200x using a Baader yellow filter. The diffraction disk was relatively good visible, but the diffraction rings were noticeably in movement (Seeing 3/5).
Jörg S. Schlimmer Germany	127mm (136x)	not split
Mark McCarthy Fremont (California/USA)	203mm (368x)	Small disk formed on diffraction spike at correct separation and PA (Feb. 2016)
Mark McCarthy Fremont (California/USA)	317mm (443x)	A faint yellow-orange disk, to the edge of Sirius A's diffraction and just below my spider's diffraction spike. I let Sirius pass beyond the field stop, and for an instant there was Sirius B, clearly separated, before it too passed beyond the field stop.

Jörg S. Schlimmer

Germany

305mm

hard to split with CMOS Camera

../projects/double-stars/joerg-schlimmer/photographs/Sirius_20210224_res_best45_bear.jpg

★★★

STF948, 12 Lyn

5^m.4

6^m.0

1.9"

65°

2020

Lyn

06^h46^m14.15^s / +59°26'30.10"

5^m.4

7^m.0

8.9"

309°

2019

Robert Zebahl Leipzig (Germany)	55mm (27x)	AC: Components A/B and C well separated, but tight. Significant difference in brightness. The fainter C companion appeared slightly orange, the brighter one white-bluish.
Robert Zebahl Leipzig (Germany)	55mm (167x)	AB: Components A and B separated, whereby the Airy disks slightly overlap. The difference in brightness was well visible.
Robert Zebahl Leipzig (Germany)	63mm (140x)	AB: Components A and B split with almost no space in between. The difference in brightness was visible.
Robert Zebahl Leipzig (Germany)	70mm (22x)	AC: Well split, relatively close together with significant difference in brightness.
Robert Zebahl Leipzig (Germany)	70mm (133x)	AB: Both components A + B clearly split, whereby the diffraction rings where merged together. A very nice view together with component C. I sketched this triplet, which reflects my impression well. Unfortunately, the distance and position angle are not particularly well observed. Also the difference in brightness I didn't noticed during my observation.
Robert Zebahl Leipzig (Germany)	102mm (129x)	At 28x the pair AC is nicely separated without any problems. The close pair AB is already recognizable at 86x as a clear figure '8', at 125x wonderfully separated. The components A & B appear yellowish. Very nice view together with STF 946 in one field of view!
Uwe Pilz Leipzig (Germany)	105mm (88x)	im selben Feld mit STF 946
Robert Zebahl Leipzig (Germany)	152mm (129x)	At 49x the pair AC is beautifully separated with a significant difference in brightness. At 100x, the close pair AB is also separated, although still very close together. A slight difference in brightness is noticeable. At 129x, the view is magnificent. The two bright components A & B present themselves yellowish, the fainter component C rather greyish. STF 948 can be well observed in a field of view with the neighbouring double star STF 946. Both show a nice overall scenery.
Mark McCarthy Fremont (California/USA)	178mm (148x)	AB: Gorgeous triple star, pale yellow A and B, and 1 delta blue C. really stunning. AB physical with a 733-year period

STF991

8^m.0

9^m.2

3.8"

165°

2019

Gem

06^h57^m01.26^s / +24°57'27.90"

8^m.0

10^m.6

134.0"

202°

2017

10^m.6

11^m.1

13.2"

0°

2017

Sarah Gebauer Germany	100mm (73x)	AB: haarscharf getrennt, nordwestliche Komponente ist etwas heller und größer und die südöstliche steht ganz schwach daneben
Uwe Pilz Leipzig (Germany)	105mm (144x)	AB: bei 88x trennbar. Orange, Begleiter schwach
Robert Zebahl Leipzig (Germany)	152mm (92x)	AB: 2022-02-27: Nice, obvious double star with moderate difference in brightness. The components are still relatively close together, but easily separable. The primary component appears bright orange with a faint companion.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: White and orange, 2 delta mag, ~5", PA to S.
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: Pretty off-yellow A and a little ruddy red B, nice

STT159, 15 Lyn

4^m.5

5^m.5

0.7"

237°

2020

Lyn

06^h57^m16.60^s / +58°25'23.00"

Uwe Pilz Leipzig (Germany)	105mm (200x)	nicht getrennt im April 2020
Frederik Wanink Itterbeck (Germany)	254mm (640x)	relativ einfach

★★

STTA80

7^m.2

7^m.4

124.1"

53°

2015

Gem

06^h58^m06.59^s / +14°13'43.40"

7^m.2

8^m.4

81.2"

112°

2015

Christopher Hay Seeheim (Germany)	7x45	Handheld. AB are a well separated, matching pair. Immediately striking in field.
Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. AB are a widely separated pair, and joined by a third, weaker, point of light, which is C, well separated. A charming little triangle. Involved in (or making up?) Monti 4 asterism.
Robert Zebahl Leipzig (Germany)	70mm (22x)	All 3 components form a striking triangle and are slightly different in color. A (western component): white-bluish; B (northern component): white-yellowish; C (southern component): orange, partly slightly reddish.

★★

STF1007

7^m.4

11^m.4

14.6"

300°

2015

Gem

07^h00^m37.12^s / +12°43'24.20"

7^m.4

10^m.0

21.9"

244°

2015

7^m.4

7^m.7

67.7"

28°

2016

Christopher Hay Seeheim (Germany)	7x45	AD: Handheld. Stands out immediately as double with clear PA in field of several similarly bright single stars. Unsupported, hand tremor prevents actually seeing each component singly, but by bracing arms in reclining chair the well-matched pair is clearly split. A physical double at a distance to us of 914 light years.
Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. AD well split. A is distinctly brighter and seems bluish. Nice in 4.5° FOV together with STTA80 ABC.
Robert Zebahl Leipzig (Germany)	70mm (22x)	AD: Wide separation, small difference in brightness. Slight difference in color, but difficult to describe. Component A at least seemed rather white. South of STF1007 there is also the double star HJ3288 and the star HD52976, which appears in a bright orange. Together in one field of view a beautiful sight.

BU573

7^m.2

7^m.8

0.8"

311°

2018

Mon

07^h01^m49.89^s / -10°52'56.30"

Uwe Pilz Leipzig (Germany)	105mm (144x)
Uwe Pilz Leipzig (Germany)	105mm (247x)	schwach gekerbt

★

HJ3288

7^m.3

8^m.7

38.5"

247°

2015

Gem

07^h02^m18.43^s / +12°34'54.20"

Robert Zebahl

Leipzig (Germany)

70mm (22x)

Easy to separate with moderate angular distance and a significant difference in brightness. Slight difference in color: white-yellowish, slightly orange. Nice view together with the double star STF1007 and HD52976, which appears in a bright orange. Sketched together with STF1007.

../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg

★★

STF1001

7^m.8

9^m.4

9.1"

66°

2019

Lyn

07^h03^m05.51^s / +54°10'26.60"

7^m.8

9^m.3

9.9"

58°

2019

9^m.4

9^m.3

1.6"

5°

2019

Robert Zebahl Leipzig (Germany)	102mm (160x)	2020-03-23: At 28x the pair A-BC is easy to separate. At 160x, the very close pair BC shows split. The component A appears slightly orange.
Uwe Pilz Leipzig (Germany)	105mm (88x)
Robert Zebahl Leipzig (Germany)	152mm (129x)	2020-03-23: At 22x, the wide pair A-BC already appears separated, but still very tight. At 69x, A appears in a subtle orange. The pair BC shows elongated and rather greenish-bluish. At 100x BC is already visible as figure '8' and almost separated, at 129x clearly separated. Components B and C are still very close together and equally bright. The color impression remains. An interesting and rewarding triple system!
Mark McCarthy Fremont (California/USA)	178mm (222x)	BC: Wow excellent 2+1, with a brighter white A and BC is a near equal faint pair about 1" separation. Seen with 148x but better resolved with 222x

RST3489

7^m.4

8^m.4

0.6"

299°

1991

Mon

07^h04^m25.53^s / -10°27'15.80"

Uwe Pilz

Leipzig (Germany)

105mm (144x)

../projects/double-stars/uwe-pilz/sketches/220228_RST3489.jpg

STF1016

7^m.4

9^m.5

5.4"

150°

2018

Mon

07^h04^m38.29^s / -11°31'26.40"

Uwe Pilz

Leipzig (Germany)

105mm (144x)

../projects/double-stars/uwe-pilz/sketches/220228_STF1016.jpg

D12 & STF1019 & RST3491, V569 Mon

D12

6^m.5

10^m.1

6.4"

282°

2003

Mon

07^h05^m49.64^s / -10°39'36.30"

STF1019

6^m.5

9^m.6

38.2"

292°

2011

RST3491

9^m.6

10^m.4

0.9"

302°

1963

René Merting Drachhausen (Germany)	12x42	AC: mit etwas Konzentration zeigt sich C extrem schwach nordwestlich von A - Abstand ordentlich
Uwe Pilz Leipzig (Germany)	105mm (144x)	AB

STF1037

7^m.2

7^m.3

0.8"

304°

2019

Gem

07^h12^m49.08^s / +27°13'30.20"

Uwe Pilz Leipzig (Germany)	105mm (260x)	eingekerbt
Uwe Pilz Leipzig (Germany)	105mm (288x)	bei 200x trennbar, beide gelb
Mark McCarthy Fremont (California/USA)	178mm (205x)	Hairline split at 205x but went to 533x to get clear view of it to drift through the field to tell PA. Slight magnitude difference. Really nice looking pair, masked down to 7-inches to get clean disks. Physical with a 118.35-year period, it will close rapidly and become undetectable during the 2030s, widening again in the 2040s
Frederik Wanink Itterbeck (Germany)	254mm (640x)	leichter, gleich hell

STF1033

7^m.8

8^m.4

1.5"

278°

2017

Lyn

07^h14^m48.05^s / +52°32'44.10"

7^m.8

10^m.2

79.3"

273°

2017

Robert Zebahl

Leipzig (Germany)

102mm (160x)

The pair AB appears clearly separated, but still pretty tight with a well visible difference in brightness. The faint C component is wide apart at a similar position angle.

../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1033.jpg

★★

145 CMa, Winter Albireo

HJ3945, Winter Albireo

5^m.0

5^m.8

26.5"

50°

2020

CMa

07^h16^m36.84^s / -23°18'56.10"

SHY508

5^m.8

6^m.8

999.9"

165°

1999

Christopher Hay Seeheim (Germany)	7x45	AB: On tripod. Very tight but definitely split. A tends towards orange. Proximity to A prevents determination of colour of B.
René Merting Drachhausen (Germany)	8x30	AB: Winter-Albireo - ein eng stehendes Pärchen, ganz knapp getrennt - Komponente A im SW knallig orange, bei B ist schwer eine Farbnuance erkennbar, eher weißlich und deutlich schwächer als A
René Merting Drachhausen (Germany)	10x50	AB: ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
Christopher Hay Seeheim (Germany)	10x56	BC: On tripod. B is set off well from visually distracting A (which in turn is the primary of HJ3945, the Winter Albireo). C seen clearly and well framed in 6.3° field of view with Tau CMa at centre of field. Shaya 508 BC is a physical double at a distance to us of 303 light years. Reported in E.J. Shaya, R. Olling, 2011: Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue. The C component is more than 3° to the south of the B component. Coordinates of C component (= HD 35578) are RA 07h20m32.5s, DEC -26°42'01".
Christopher Hay Seeheim (Germany)	10x56	AB: On tripod. Immediately striking as well-split pair. A flashing orange. Glare and scintillation of A prevent any definite colour impression of B.
René Merting Drachhausen (Germany)	18x70	AB: ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
Christopher Hay Seeheim (Germany)	42mm (12x)	AB: Clean split. Orange and blue.
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 32x leuchtet Komponente A goldgelb, B im NO wirkt weiß ohne den erwarteten Farbstich, auch nicht bei 107x und auch nicht, wenn ich die Sterne leicht unscharf stelle - trotzdem sehenswert - auch bei 20x zeigen sich beide Sterne ordentlich voneinander getrennt, A strahlt jetzt noch tiefgelber, fast orange
Uwe Pilz Leipzig (Germany)	105mm (37x)	AB: sofort auffallend, blau-orange
Robert Zebahl Leipzig (Germany)	120mm (23x)	AB: Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.

STF1050

8^m.1

8^m.8

19.4"

21°

2020

Lyn

07^h19^m51.29^s / +54°55'18.40"

Robert Zebahl Leipzig (Germany)	70mm (22x)	Rather faint, obviously split with visible difference in brightness. View similar to STF 1062.
Robert Zebahl Leipzig (Germany)	102mm (28x)

STF1066, delta Gem, 55 Gem

3^m.5

8^m.2

5.5"

229°

2018

Gem

07^h20^m07.39^s / +21°58'56.40"

Robert Zebahl Leipzig (Germany)	55mm (71x)	Large difference in brightness. The fainter component was well separated, but just a very tiny star.
Robert Zebahl Leipzig (Germany)	102mm (160x)	Easy to separate with relatively large distance. The companion appeared as a tiny, faint star.
Winfried Kräling Marburg (Germany)	102mm (178x)
Uwe Pilz Leipzig (Germany)	105mm (200x)	Nicht gesehen, wahrscheinlich ist der Begleiter zu schwach für leicht diesigen Himmel
Uwe Pilz Leipzig (Germany)	105mm (288x)	erster Ring in SSW heller, zweiter nur an dieser Stelle sichtbar
Mark McCarthy Fremont (California/USA)	178mm (205x)	Bright light yellow A and much fainter light orange B, wide about 6". Physical
Mark McCarthy Fremont (California/USA)	317mm (553x)	Wasat = Delta Geminorum: Pretty white-yellow and red-orange pair, PA to west, ~4".

STF1062, 19 Lyn

5^m.8

6^m.7

13.8"

317°

2019

Lyn

07^h22^m52.06^s / +55°16'53.30"

Robert Zebahl Leipzig (Germany)	70mm (22x)	Clearly separated, moderate distance, noticeable difference in brightness. The colors seemed different, but not exactly definable.
Robert Zebahl Leipzig (Germany)	102mm (28x)
Uwe Pilz Leipzig (Germany)	105mm (21x)
Robert Zebahl Leipzig (Germany)	152mm (22x)	Easy to separate, but still quite close together with visible difference in brightness. Color wise unremarkable.
Mark McCarthy Fremont (California/USA)	178mm (148x)	Bright, white, 1 delta mag, wide, parallax indicates physical

★

STF1081

7^m.7

8^m.5

1.9"

234°

2019

Gem

07^h24^m08.94^s / +21°27'28.00"

7^m.7

9^m.9

107.0"

63°

2017

Robert Zebahl Leipzig (Germany)	102mm (28x)	AC: Rather wide apart from component A with noticeable difference in brightness. Less conspicuous.
Robert Zebahl Leipzig (Germany)	102mm (86x)	AB: At 86x just separated, very close together with moderate difference in brightness. In relation to A, the components B & C are almost opposite each other. At 125x, A & B are easy to split.
Uwe Pilz Leipzig (Germany)	120mm (180x)
Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: Very pretty blue-white A and slightly orange B, well separated about 2"

STF1083

7^m.3

8^m.1

6.9"

226°

2019

Gem

07^h25^m35.30^s / +20°29'42.60"

Robert Zebahl Leipzig (Germany)	70mm (22x)	Unequal pair. At 22x very tight, at 44x well split. Fainter companion appeared slightly orange, brighter one white-bluish.
Uwe Pilz Leipzig (Germany)	120mm (94x)
Mark McCarthy Fremont (California/USA)	178mm (205x)	White stars, wide, 1 delta mag. A nice, typical Struve

STF1094

7^m.6

8^m.5

2.5"

97°

2019

Gem

07^h27^m25.99^s / +15°18'59.00"

Robert Zebahl Leipzig (Germany)	70mm (57x)	At 57x barely split with noticeable difference in brightness. At 100x well split, but still tight.
Uwe Pilz Leipzig (Germany)	120mm (200x)
Mark McCarthy Fremont (California/USA)	178mm (205x)	White, 1.5 delta mag, about 2", nice and cleanly split

★

ES2625 & S548

ES2625

7^m.0

12^m.4

11.9"

24°

2015

Gem

07^h27^m40.54^s / +22°08'29.30"

S548

7^m.0

8^m.9

35.3"

277°

2019

Christopher Hay Seeheim (Germany)	15x45	S548 (AC): Binoculars with internal stabilisation, handheld. Clean split. Secondary very faint. Primary yellowish-orange, a colour impression confirmed (without split) in handheld 7x45. Seen together with Eskimo Nebula (stellar) in 4.5° FOV. A physical double at a distance to us of 1199 light years.
René Merting Drachhausen (Germany)	100mm (20x)	S548 (AC): bei 32x ein weit getrenntes Paar - Komponente A strahlt schwach gelblich … eher dunkelgelb - Komponente C im Westen von A ist gut 1.5 Magnituden schwächer und dunkelgrau bis lachsorange - der Doppelstern steht isoliert, fällt aber nicht übermäßig auf - zurück auf 20x ist das Paar weiterhin gut getrennt erkennbar
Uwe Pilz Leipzig (Germany)	105mm (88x)	S548 (AC): bei 21x trennbar, orange und fahlblau
Mark McCarthy Fremont (California/USA)	317mm (553x)	S548 (AC): Orange with a 2x fainter white star, PA slightly SW. AB is 12th mag and not seen

★★★

STF1110, alpha Gem, 66 Gem, Castor

1^m.9

3^m.0

5.4"

53°

2020

Gem

07^h34^m35.86^s / +31°53'17.80"

1^m.9

9^m.8

71.6"

164°

2020

1^m.9

10^m.1

179.8"

221°

2017

Christopher Hay Seeheim (Germany)	20x60	AB: Handheld in reclining chair, binoculars with internal stabilisation. 16 April 2022 (5.5" angular distance according to database): Distinctly elongated, like a rectangle at the transition to a figure-8.
Christopher Hay Seeheim (Germany)	26x42	AB: 13 May 2022 (5.5" angular distance according to database). Moon four-fifths full a few degrees north of Spica in Virgo. 70mm binoculars stopped down to 42mm aperture. Directly after looking the Moon I was able to split Castor AB definitely. Could hold this for a full minute, only then did the split start to become uncertain. Repeated the observation several times, found the split to be definite each time.
Christopher Hay Seeheim (Germany)	32x70	AB: 13 March 2022 (5.5" angular distance according to database): Moon only 6° away and two-thirds full in the middle of Gemini. After concentrated observation of the Moon I slewed quickly to Castor to exploit the heightened acuity provided by viewing the bright Moon. Castor clearly split with fine black between A and B. After a while the split became more difficult but could still be held. Followed this up with the same eyepiece previously used in the achromatic 70/400 binoculars now placed in 71/400 fluorite apochromatic telescope, thus again yielding 32x. Again A and B split after observation of the Moon, but harder to hold with the mono apochromat than with the bino achromat.
Christopher Hay Seeheim (Germany)	36mm (33x)	AB: 16 April 2022 (5.5" angular distance according to database): With Käsemann (KSM) polarising filter at 33x two kissing Airy disks which seem to move apart in good moments, but this is uncertain. Without filter at 33x just a squat figure-8 far removed from separation. With polarising filter at 40x definite separation, fine first diffraction ring of component A. Without filter a stretched figure-8 with no separation. At 50x clear and stable separation with and without filter. Best view at 66x, a ghostly pair in pitch-black FOV, the first diffraction rings of A and B merging, that of B very faint. With a Baader Neodymium filter the positive effects are similar to those of the KSM polarising filter, but the clarity of separation is not quite as great as with the polarising filter.
Robert Zebahl Leipzig (Germany)	55mm (27x)	AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.
Robert Zebahl Leipzig (Germany)	63mm (26x)	AB: Experiment to determine the smallest magnification to separate Castor. I observed on 2022-05-09, 2022-05-11 & 2022-05-18. At 26x and 30x easily seen as a double star, but not clearly separable due to outshining. At 70x of course easily separated. Stopped down to 30mm aperture, Castor appeared partially separated at 26x, but very barely. The right viewing position at the eyepiece was important. At 30x with 30mm aperture, Castor was cleanly separated, but extremely tight. Following a hint from Christopher Hay, I also used a red filter from Baader to avoid outshining at full aperture. Now also a separation at 26x was possible, whereby the components were extremely close to each other. For me a magnification of 26x seems to be the minimum to separate Castor cleanly, if the brightness of the components is reduced sufficiently.
Robert Zebahl Leipzig (Germany)	70mm (44x)	AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.
Christopher Hay Seeheim (Germany)	76mm (50x)	AB: 18 February 2021: At 23x oval-elongated with clear position of component A. At 50x finely split. At 83x best sight with first diffraction rings slightly overlapping. At 100x nice pattern of the Airy disks and the overlapping first and second diffraction rings of both components.
René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 32x wirkt der Stern leicht länglich - bei 107x stehen die beiden Sterne schön eng mit überlagernden Beugungsscheibchen, die Komponenten sind dennoch getrennt erkennbar - Komponente B im Osten ist eine halbe Magnitude schwächer - ganz schwacher Farbkontrast
Uwe Pilz Leipzig (Germany)	105mm (144x)	AB: blauweiß-weiß
Winfried Kräling Marburg (Germany)	127mm (250x)	AB: 13.03.2017: Beide Komponenten gelblich mit geringem Helligkeitsunterschied, bereits bei V=60x getrennt.
Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: Castor. A is a very pale yellow and B is yellow-green, 2 delta mag, very bright, pretty wide, some fainter stars about. Physical with a 459.8-year period
Christopher Hay Seeheim (Germany)	180mm (200x)	AB: Two fat spotlights in space. Component B seems greenish at first sight (using a first-class reflector free of chromatic aberration), and certainly has a different hue than component A. The second diffraction rings of A and B meet.

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/Castor.jpg

★★

STF1126

6^m.5

7^m.0

0.9"

176°

2019

CMi

07^h40^m06.99^s / +05°13'51.90"

Uwe Pilz Leipzig (Germany)	105mm (288x)	beide gelb. Es war schwierig, die hellere Komponente zu erkennen. Direkt neben Prokyon.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Wow, very close <1" hair-split, near equal brightness

★

STF1122

7^m.8

14.9"

186°

2019

Cam

07^h45^m52.47^s / +65°09'28.10"

René Merting Drachhausen (Germany)	18x70	ein genialer, heller Stern für 18x-Ferngläser - ein wunderschönes enges Sternpaar, wo drei Blatt Papier dazwischen passen
Robert Zebahl Leipzig (Germany)	70mm (31x)	2020-05-15: At 22x immediately apparent with a beautiful separation between the equally bright components. One component appeared slightly bluish, the other light orange. At 44x the subtle color difference can be seen a bit better. The double star is in a nice star field together with 51 Cam.
René Merting Drachhausen (Germany)	320mm (45x)	bei 72x ein gut getrenntes Pärchen zweier gleich heller Sterne - trotz vieler gleich heller Sterne im Gesichtsfeld wirkt das Doppel gut isoliert

STF1137

8^m.0

9^m.1

3.1"

133°

2016

CMi

07^h46^m35.35^s / +04°07'50.10"

Uwe Pilz Leipzig (Germany)	105mm (200x)	Der schwächere Stern ist nur indirekt sichtbar, deshalb schwierig
Mark McCarthy Fremont (California/USA)	203mm (333x)	Light orange and blue, pretty wide, 1.5 delta mag

STF1127

7^m.0

8^m.4

5.6"

340°

2019

Cam

07^h47^m00.43^s / +64°03'07.30"

7^m.0

9^m.7

11.6"

178°

2019

8^m.4

9^m.7

16.9"

173°

2019

René Merting Drachhausen (Germany)	18x70	AC: von den Rahmendaten ist eine Trennung von A und C eigentlich möglich, aber vermutlich ist der Helligkeitsunterschied zwischen beiden Sternen von 2.7 mag zu groß - ich konnte C nicht entdecken
Robert Zebahl Leipzig (Germany)	70mm (57x)	2020-04-15: At 31x all three components are visible, with B still very close to component A. Component C is rather dim overall. At 57x, A appears white-yellowish, B slightly orange.
René Merting Drachhausen (Germany)	320mm (45x)	AB: bei 45x ist B ganz dicht nördlich an A angrenzend erkennbar (knapp getrennt), B etwas heller als C im Süden - bei 72x wird die Trennung einfacher und alle drei Sterne stehen fast auf einer Linie AC: bei 45x ist C ganz schwach südlich von A erkennbar - bei 72x schätze ich, etwas mehr als die doppelte Entfernung AB, C wirkt grau, während A und B weiß strahlen

STF1171

6^m.5

9^m.9

2.1"

326°

2016

Cnc

08^h01^m00.78^s / +23°34'59.20"

René Merting Drachhausen (Germany)	100mm (213x)	bei 142x schmiegt sich Komponente B an der Grenze zur Sichtbarkeit im Süden von Komponente A ganz dicht an den viel größeren Bruder, der ohne Beugungsringe auskommt - bei 213x zeigt sich B leicht abgesetzt von A
Robert Zebahl Leipzig (Germany)	102mm (187x)	Observation from the city at half moon. At magnifications between 187x and 280x I could see the very dim companion almost permanently near the first diffraction ring. But the diffraction ring itself was hardly visible. Main problem here was probably the low brightness of the companion.
Uwe Pilz Leipzig (Germany)	105mm (200x)	schwierig. Zu ahnen bei 144x
Mark McCarthy Fremont (California/USA)	178mm (205x)	Very tough for a Struve. B is very faint and comes to view only with seeing as a very fine point, pretty well separated from A, but A needs to be a disk for B to resolve out of the diffraction. Seen fleetingly, somewhat better with averted vision but averted vision often misses moments of best seeing. Physical
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow and orange, 4 delta mag! very faint and close B

★★

STF1177, 17 Cnc

6^m.7

7^m.4

3.5"

350°

2019

Cnc

08^h05^m37.06^s / +27°31'46.90"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Easy to separate, but still relatively close together. Well visible difference in brightness. Color of the components was not clearly visible. Nice view overall.
René Merting Drachhausen (Germany)	100mm (64x)	bei 107x sehe ich ein knapp getrenntes schön eng stehendes Pärchen - Komponente B im Norden ist eine dreiviertel Größenklasse schwächer - das Weiß von A wirkt kühler - zurück auf 64x sehe ich eine Ameise mit dünnem Hals, in ruhigen Momenten zeigen sich beide Sterne sogar getrennt
Uwe Pilz Leipzig (Germany)	105mm (144x)
Uwe Pilz Leipzig (Germany)	105mm (180x)	Blau und Orange - sehr schöner Farbkontrast, unterstützt durch die ähnliche Helligkeit
Christopher Hay Seeheim (Germany)	125mm (160x)	Well split despite substantial turbulence in the atmosphere. Main component creamy yellow-white, companion pale blue. A very attractive colour contrast warranting a one-star rating.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Excellent, around 1 delta mag and wide, blue-white stars, nicely resolved
Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellowish, 1 delta mag, ~4"
Karsten Kopp Köln (Germany)	600mm (180x)	Gut zu trennender Doppelstern, mit gut erkennbaren Helligkeitsunterschied . Der hellere Stern leuchter weiß-gelblich, während der schwächere leicht bläulich schimmert. Schöner Farbkontrast

★★★

zeta Cnc, 16 Cnc

STF1196

5^m.3

6^m.2

1.2"

2°

2020

Cnc

08^h12^m12.79^s / +17°38'51.20"

STF1196

AB-C

4^m.9

5^m.8

6.0"

64°

2020

STF1196

5^m.3

5^m.8

6.2"

62°

2020

HUT1

Ca-Cb

6^m.2

7^m.1

0.3"

8°

2020

Robert Zebahl Leipzig (Germany)	70mm (133x)	The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch.
Christopher Hay Seeheim (Germany)	71mm (32x)	AB-C: Finely split. AB yellowish. Substantial delta-mag.
Robert Zebahl Leipzig (Germany)	102mm (86x)	AB-C: Easy to separate. A: light grey, B: pale orange.
Stefan Loibl Rosenheim (Germany)	102mm (164x)	AB-C clearly split, AB obviously elongated but not split
Uwe Pilz Leipzig (Germany)	105mm (288x)	weißblau-gelb-gelb
Robert Zebahl Leipzig (Germany)	120mm (67x)	AB-C: Evident difference in brightness, easy to split. Both components of similar color.
Robert Zebahl Leipzig (Germany)	120mm (200x)	AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star!
Winfried Kräling Marburg (Germany)	127mm (250x)	08.04.2018: Sehr schön, 3-fach Stern, A = weißgelb, B = weißgelb, C = weißgelb
Sarah Gebauer Germany	150mm (83x)	AB-C: bei 83x sind AB-C sauber getrennt, laut Atlas 2020 6,1'' Abstand, die Komponenten A und B mit 1,1'' lassen sich nicht trennen, viele schöne Feldsterne dabei
Christopher Hay Seeheim (Germany)	180mm (200x)	AB: Hair-fine split. A and B both yellowish-white. C wide from AB, bluish-white, nice colour contrast to AB.
Frederik Wanink Itterbeck (Germany)	254mm (200x)	AB-C: AB (1,1") nicht bemerkt
Mark McCarthy Fremont (California/USA)	317mm (553x)	Ca-Cb: not quite round, oval/olive shaped. It is the AB-C of STF 1196.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Triple, all near equal magnitude, yellow-white. AB ~0.8", hair split.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AC: Triple, all near equal magnitude, yellow-white. AC ~6", wide split.
Karsten Kopp Köln (Germany)	600mm (257x)	AB: Die Komponenten AB-C bei etwas größerem Helligkeitsunterschied einfach zu trennen und auch schön anzusehen. Sterne erstrahlen weißlich gelb. Komponente AB war nicht zu trennen.

★★

STF1224, 24 Cnc

A-BC

6^m.9

7^m.5

5.7"

53°

2019

Cnc

08^h26^m39.82^s / +24°32'03.70"

Uwe Pilz

Leipzig (Germany)

105mm (128x)

fahlviolett und gelb

../projects/double-stars/uwe-pilz/sketches/210330STF1224.jpg

★★

STF1223, phi 2 Cnc

6^m.2

5.2"

219°

2019

Cnc

08^h26^m47.08^s / +26°56'07.80"

Christopher Hay Seeheim (Germany)	25x80	Hair-fine, but definite and constantly held split. Charming in 3.3° FOV with Phi1 and Chi Cnc. Easier than I would have thought at only 25x. This is clearly aided by the very well-matched brightnesses of the components. The 70% full moon nearby in Leo also helps, as its brightness boosts the eyes' acuity. During the observation I gaze intentionally directly into the moon at intervals in order to utilise this effect, a technique honed in earlier binocular observations of planets. Primary is slightly brighter than the secondary, again surprising considering that delta-mag is only 0m05 (6m16 to 6m21 according to Stelledoppie). Not a physical pair, alas, although it looks so much like one.
Christopher Hay Seeheim (Germany)	36mm (33x)	Hairfine split at 33x, clearer at 40x, quite clear at 50x.
Uwe Pilz Leipzig (Germany)	105mm (28x)	weiß und gelb
Uwe Pilz Leipzig (Germany)	105mm (88x)	sehr schön, blauweiß-gelbweiß
Mark McCarthy Fremont (California/USA)	508mm (205x)	Bright white, equal, wide -- dramatic but not much. Not physical
Karsten Kopp Köln (Germany)	600mm (180x)	Schöner und einfach zu trennender Doppelstern, wo beide Sterne dieselbe Helligkeit haben und weißlich strahlen. Wie ein Augenpaar im All

STF1230

9^m.3

10^m.6

33.8"

186°

2017

Cnc

08^h28^m25.95^s / +16°51'09.10"

Uwe Pilz Leipzig (Germany)	105mm (200x)	Komponente B nur indirekt. bei 88x erahnbar.
Karsten Kopp Köln (Germany)	600mm (180x)	Einfacher Doppelstern mit größerem Helligkeitsunterschied.

★★

STF1245

6^m.0

7^m.2

10.1"

25°

2020

Cnc

08^h35^m51.05^s / +06°37'13.90"

6^m.0

10^m.7

99.8"

109°

2020

6^m.0

11^m.9

109.1"

292°

2020

6^m.0

9^m.6

113.2"

207°

2020

Robert Zebahl Leipzig (Germany)	70mm (57x)	AB at 22x separated, but very close, uneven pair. A appeared white-yellowish, B orange, partly reddish. Opposite in a wide separation the fainter component E was visible. At 57x, A appeared white-yellowish, B orange.
René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x ein sehr enges Pärchen, gerade so getrennt - das Sternpaar ist heller, als viele andere Sterne in der unmittelbaren Umgebung, dadurch ist es sehr auffällig - Komponente A strahlt reinweiß, B steht dem in nichts nach, auch wenn die Komponente gut eine Magnitude schwächer ist
Sarah Gebauer Germany	100mm (45x)	AB: schmal, aber deutlich getrennt, die südliche Komponente sichtbar heller, die nordöstliche schwächer
Uwe Pilz Leipzig (Germany)	105mm (88x)	AB
Mark McCarthy Fremont (California/USA)	508mm (533x)	AB: Wide and bright pair, light yellow and orange, easy, slight mag difference
Karsten Kopp Köln (Germany)	600mm (180x)	AB: AB: Schöner und einfacher Doppelstern, wobei die Komponente A weißlich gelb und Komponente B gelblich orange leuchtet. Das Sternfeld in direkter Umgebung rundet den schönen Eindruck ab.

STF1270

6^m.9

7^m.5

4.7"

265°

2020

Hya

08^h45^m20.79^s / -02°36'03.70"

René Merting Drachhausen (Germany)	100mm (64x)	bei 32x hatte ich schon den richtigen Verdacht, bei 64x ist es eindeutig, beide Sterne stehen knapp getrennt schön eng zusammen - Komponente A im Osten wirkt cremeweiß, B eher weißblau
Uwe Pilz Leipzig (Germany)	120mm (94x)
Mark McCarthy Fremont (California/USA)	508mm (533x)	MX Hya. Wide, yellow-white, half delta mag. Nice

★★

STF1268, iota Cnc, 48 Cnc

4^m.1

6^m.0

31.3"

307°

2020

Cnc

08^h46^m41.82^s / +28°45'35.60"

Christopher Hay Seeheim (Germany)	10x42	Binoculars with internal stabilisation, handheld. Secondary a pinprick of light directly next to the overpowering primary. Slightly uncertain, but PA as seen confirmed afterwards in database. In stabilised 15x45 binoculars the pair is well split, primary white tending towards yellow, secondary substantially colder. A physical double at a distance to us of 331 light years.
Christopher Hay Seeheim (Germany)	15x60	On tripod. Well split. Primary very pale yellow, secondary very pale blue. A most striking pair.
Robert Zebahl Leipzig (Germany)	70mm (22x)	Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-bluish.
Christopher Hay Seeheim (Germany)	71mm (32x)	Compact pair. Yellow, pale blue. Totally dominates 2.2° FOV.
Robert Zebahl Leipzig (Germany)	102mm (28x)	Grand sight! Pretty wide apart and unequal. A: mild orange, B: very nice light blue.
Stefan Loibl Rosenheim (Germany)	102mm (164x)	wide pair with nice colour contrast yellow/blue
Uwe Pilz Leipzig (Germany)	105mm (28x)	fahlblau und gelborange
Uwe Pilz Leipzig (Germany)	105mm (144x)	gelb-blaugrau
Sarah Gebauer Germany	150mm (125x)	bei 83x schon deutlich getrennt, der Farbkontrast ist gut zu sehen, er wird bei 125x noch stärker, ein zartes Blau und Gelb sind zu sehen
Mark McCarthy Fremont (California/USA)	317mm (553x)	Iot Cnc: Pretty orange and pale blue, showpiece object.

★★★

11 Hya, epsilon Hya

SP1

3^m.5

5^m.0

0.2"

241°

2018

Hya

08^h46^m46.51^s / +06°25'07.70"

STF1273

AB-C

3^m.5

6^m.7

2.9"

311°

2020

STF1273

AB-D

3^m.5

12^m.5

18.1"

201°

2017

STF1273

AB-E

3^m.5

10^m.8

340.5"

2°

2015

STF1273

AB-F

3^m.5

10^m.4

406.5"

265°

2015

Robert Zebahl Leipzig (Germany)	70mm (133x)	AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Sarah Gebauer Germany	100mm (200x)	AB-C: ist ein heller Stern vom Hydra-Kopf, nicht zu trennen, vermutlich, weil die Komponente AB zu hell strahlt
Robert Zebahl Leipzig (Germany)	102mm (160x)	AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
Uwe Pilz Leipzig (Germany)	105mm (200x)	AB-C: bei 144x schwierig
Robert Zebahl Leipzig (Germany)	152mm (150x)	AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).
Mark McCarthy Fremont (California/USA)	508mm (533x)	AB-C: Epsilon Hya A is bright orange-yellow, B is much fainter and a little blue, ~3". [SP 1 AB is 3.49/5.00 0.2" not seen]

STF1276

8^m.3

8^m.6

12.7"

353°

2017

Cnc

08^h47^m10.99^s / +11°09'34.20"

Robert Zebahl Leipzig (Germany)	16x70	2022-03-02: Pretty tight, medium bright double star with small difference in brightness.
Sarah Gebauer Germany	100mm (45x)	das enge Pärchen bei 45x ist deutlich getrennt, die dritte Komponente landete unwissenderweise sogar auch auf der Zeichnung
Mark McCarthy Fremont (California/USA)	178mm (148x)	Wide, white, near equal stars, nice

STF1281

7^m.8

9^m.0

53.1"

310°

2017

Hya

08^h47^m36.90^s / +00°01'04.30"

René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein weit auseinander stehendes Paar - Komponente B im NW ist halb so hell und wirkt gräulich gegenüber der buttergelben Komponente A - zurück auf 20x ist B noch nicht zu schwach und immernoch gut getrennt von A erkennbar
Uwe Pilz Leipzig (Germany)	120mm (94x)	nicht als Mehrfachstern erkennbar, eher wie drei Feldsterne

BU335

7^m.5

9^m.4

2.6"

265°

2017

Hya

08^h48^m12.24^s / +02°34'48.40"

Sarah Gebauer Germany	100mm (200x)	auch bei 200x nicht zu trennen
Uwe Pilz Leipzig (Germany)	105mm (200x)	schwierig
Uwe Pilz Leipzig (Germany)	120mm (250x)
Mark McCarthy Fremont (California/USA)	508mm (533x)	3 delta mag, well split ~3", very pleasing pair, white A and slightly red B

BU587 & H5 120, 15 Hya

BU587

5^m.8

7^m.4

1.2"

121°

2017

Hya

08^h51^m34.44^s / -07°10'38.00"

H5 120

AB-C

5^m.5

11^m.4

45.6"

6°

2015

BU587

AB-D

5^m.5

12^m.1

55.5"

56°

2015

Uwe Pilz

Leipzig (Germany)

120mm (360x)

94x & 360x

../projects/double-stars/uwe-pilz/sketches/220323_15Hya.jpg

★

STF1291, 57 Cnc

6^m.1

6^m.4

1.5"

310°

2019

Cnc

08^h54^m14.65^s / +30°34'45.80"

AB-C

5^m.5

9^m.2

54.6"

204°

2015

Robert Zebahl Leipzig (Germany)	70mm (133x)	AB: Immediately apparent as a double star. Diffraction disks overlapping slightly ('8'). Difference in brightness visible.
Uwe Pilz Leipzig (Germany)	105mm (144x)	gelb
Sarah Gebauer Germany	150mm (125x)	AB: sowohl bei 83x als auch bei 125x knapp vorm Trennen
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: 57 Cnc. Very nice pair, strong orange yellow colors, ~1 delta mag, bright, nice close split

★★

STF1306, sigma 2 UMa, 13 UMa

4^m.9

8^m.8

4.4"

346°

2020

UMa

09^h10^m23.53^s / +67°08'03.30"

4^m.9

10^m.3

197.8"

148°

2003

Robert Zebahl Leipzig (Germany)	70mm (100x)	AB: Companion almost permanently visible as elongated, non-condensed brightening of the first diffraction ring of the primary component at the correct position angle.
Christopher Hay Seeheim (Germany)	76mm (20x)	AB, April 2021: No luck with AB at all magnifications from 83x to 167x. AC: Component C very faint and quite distant, not really seeming to belong.
Mark McCarthy Fremont (California/USA)	80mm (150x)	AB: Suspected very close unequal white stars. 920-year period, slowly widening
Uwe Pilz Leipzig (Germany)	105mm (144x)	AB: sehr schwierig bei 88x

STF1336

7^m.0

11^m.1

40.1"

180°

2015

Hya

09^h17^m32.92^s / +00°33'17.80"

Uwe Pilz

Leipzig (Germany)

105mm (144x)

sehr weit, kein Doppelstern-Eindruck

../projects/double-stars/uwe-pilz/sketches/200323STF1336.jpg

★

STF1333

6^m.6

6^m.7

1.8"

50°

2018

Lyn

09^h18^m25.97^s / +35°21'51.30"

Robert Zebahl Leipzig (Germany)	63mm (120x)	At 93x seen as '8', at 120x split, but pretty tight with no visible difference in brightness.
Christopher Hay Seeheim (Germany)	71mm (32x)	Elongated with clear PA.
Uwe Pilz Leipzig (Germany)	105mm (200x)	fast gleich hell, beide gelblich, bei 66x schwierig
Christopher Hay Seeheim (Germany)	180mm (113x)	Hairfine split, evenly matched pair, rather attractive. No particular colour.
Mark McCarthy Fremont (California/USA)	508mm (333x)	Brilliant white pair, near equal, ~2" separation

★

STF1334, 38 Lyn

3^m.9

6^m.1

2.6"

224°

2019

Lyn

09^h18^m50.64^s / +36°48'09.30"

Uwe Pilz Leipzig (Germany)	60mm (198x)	Aufhellung im ersten Ring
Robert Zebahl Leipzig (Germany)	63mm (140x)	Fainter companion only seen as permanent brightening on the first diffraction ring.
Christopher Hay Seeheim (Germany)	71mm (32x)	Figure-8 with clear positions and delta-mags of components. Bluish-white.
Uwe Pilz Leipzig (Germany)	105mm (288x)	gelb, trennbar bei 66x
Mark McCarthy Fremont (California/USA)	178mm (205x)	Very bright light blue A and 3 delta magnitude greenish B, close, about 3" separation. Physical with 2782 year period
Christopher Hay Seeheim (Germany)	180mm (113x)	Clean split, large delta-mag. Separation ca. 1.5 times that of nearby STF1333.

STF1331

8^m.5

8^m.7

0.9"

153°

2017

UMa

09^h20^m46.02^s / +61°20'58.40"

8^m.5

11^m.6

13.5"

186°

2015

8^m.5

14^m.5

19.4"

117°

2015

8^m.5

9^m.8

139.1"

223°

2015

Robert Zebahl Leipzig (Germany)	152mm (180x)	2020-04-13: The wide pair AE is already visible at 22x with a significant difference in brightness, but quite inconspicuous. A appeared white-yellowish, E rather orange. The close pair AB appeared immediately elongated at 129x, partly visible as '8'. At 180x, AB was just separated with a fine black space between them. The faint C component was only visible with averted vision. Best view at 180x. The even fainter D component was out of range.
Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: Fine hairline split with seeing at 205x, better split at 333x, almost 1 delta mag, a very fine pair. Three other faint stars appear with averted vision, and can then barely hold them direct, all nearby and arranged in a right angle to A with two of them on one side. These are C, D, and E

★★

STF1347

7^m.3

8^m.3

21.1"

312°

2016

Hya

09^h23^m15.76^s / +03°30'05.00"

Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-10: At 22x beautifully separated at moderate separation and difference in brightness. Primary component appeared white-bluish, companion slightly orange. At 44x the primary component looked more white-yellowish, the companion showed a clear tendency to orange.
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein auffälliges Sternpaar - Komponente B im Nordwesten ist gut abgesetzt erkennbar und ca. ein 3/4 Größenklasse schwächer - bei 20x rücken die beiden Sterne richtig schön zusammen und sind noch knapp getrennt erkennbar
Uwe Pilz Leipzig (Germany)	105mm (88x)	sehr schöner Farbkontrast

★★

STF1348

7^m.5

7^m.6

2.0"

314°

2018

Hya

09^h24^m28.48^s / +06°21'01.80"

Robert Zebahl Leipzig (Germany)	70mm (100x)	2020-04-10: At 67x clearly elongated, at 80x clearly visible as figure '8'. At 100x a very small difference in brightness was to be guessed, at 133x visible. Near the double star STF 1355.
Uwe Pilz Leipzig (Germany)	105mm (144x)	Im selben Aufsuchfeld wie stf1355, ähnliche Erscheinung
Mark McCarthy Fremont (California/USA)	203mm (333x)	Very pretty half delta mag, ~2" pair, white. Sharp despite low declination

★★

STF1355

7^m.7

7^m.8

1.8"

357°

2018

Hya

09^h27^m16.69^s / +06°13'59.00"

Robert Zebahl Leipzig (Germany)	70mm (100x)	2020-04-10: At 67x clearly elongated, equally bright. At 80x detectable notch. At 100x and 133x clearly visible as figure '8'. Near the double star STF 1348.
Uwe Pilz Leipzig (Germany)	105mm (144x)	Im selben Aufsuchfeld wie stf1348, ähnliche Erscheinung
Mark McCarthy Fremont (California/USA)	203mm (333x)	Light yellow pair, near equal, very nice, ~2"

★

STF1349

7^m.5

9^m.0

19.2"

166°

2015

UMa

09^h31^m09.89^s / +67°32'28.40"

René Merting Drachhausen (Germany)	18x70	einfacher als der benachbarte Doppelstern STF 1350 - ordentlich getrennt - Komponente B ist 1 bis 1.5 Größenklassen schwächer
Christopher Hay Seeheim (Germany)	60mm (25x)	At 25x a wide split, substantial difference in brightness, B a fine pinprick of light. B appears light blue at first, but colour impression disappears quickly - an interesting visual effect repeated several times. According to Stelledoppie a true physical pair. Nice together with Struve 1350 in same FOV. A very fine double-double for very small apertures.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-19: At 22x easy to separate with significant difference in brightness. The primary component appears whitish, the companion darker. At 44x, the primary component looks rather white-yellowish, the companion greyish.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x stehen beide Sterne bequem getrennt auseinander - Komponente B im Süden ist eine knappe Größenklasse schwächer und kupfergrau - ein schönes Doppel-Doppel zusammen mit STF1350 gut 47' weiter südsüdöstlich
Uwe Pilz Leipzig (Germany)	105mm (88x)	sichtbar bei 21x
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x steht das Pärchen gut auseinander - Komponente B ist eine dreiviertel Größenklasse schwächer und wirkt grauweiß - A ist weiß mit einem zarten Stich ins Gelbe

★★

STF1350

8^m.3

10.2"

249°

2015

UMa

09^h34^m19.56^s / +66°47'42.30"

8^m.3

9^m.2

131.0"

216°

2015

René Merting Drachhausen (Germany)	18x70	AB: ein sehr enger Doppelstern, äußerst knapp getrennt … und das auch nur in guten Momenten, ansonsten wirkt das Paar wie eine Ameise - beide Sterne sind gleich hell - ein FG-Tester für 18x
Christopher Hay Seeheim (Germany)	60mm (25x)	AB: Tight but nicely split at 25x. No colour whatsoever seen. A appears brighter than B, whereby the data do not support this – perhaps a product of different (yet not seen) colouration? According to Stelledoppie not a physical pair. Attractive together with Struve 1349 in same field of view.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-19: At 22x A & B equally bright and still pretty close together. Component C is visible at a much greater distance. At 44x, A & B show a color difference: orange, white-bluish.
René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x ein schönes enges Paar zweier gleich heller Sterne, knapp getrennt - STF1350 AB bildet mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense AC: bei 32x bildet STF1350 AB mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense - der erste der vier Sterne bzw. der nächststehende Stern südsüdwestlich mit mehr als zehnfachem Abstand AB ist Komponente C, er ist schätzungsweise eine halbe Größenklasse schwächer
Uwe Pilz Leipzig (Germany)	105mm (88x)	AB: trennbar bei 21x. Fast gleichell, aber deutlicher Farbkontrast, lohnend.
Robert Zebahl Leipzig (Germany)	152mm (100x)	At 22x, all three components are already visible, with A & B still standing quite close together. Component C is less prominent. At 69x and 100x, the pair AB shows a nice color contrast: The eastern component mostly appeared in a slightly shiny orange, while the other component appeared more white-bluish. During the observation, however, the colors changed between both components. At the time of observation, the pretty bright comet C/2019 Y4 Atlas was also in the same field of view - a great scene! Note to the sketch: The positions of the stars to each other do not exactly match, also the alignment of the pair AB to C.
Christopher Hay Seeheim (Germany)	180mm (113x)	AB: Immediately striking in 32x71 superfinder wihle panning through the area, a very evenly matched pair well split at that power. Closer inspection with the 7-inch at 113x reveals a fine blue-orange colour contrast between components A and B.
René Merting Drachhausen (Germany)	320mm (45x)	AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß

STF1366

8^m.4

10^m.1

7.8"

321°

2019

UMa

09^h35^m42.47^s / +53°17'40.40"

Uwe Pilz Leipzig (Germany)	120mm (94x)	mit STF 1368
Mark McCarthy Fremont (California/USA)	178mm (205x)	This one is a 2 delta magnitude pair, about 8", pretty wide. Physical. There is another wide near equal pair to the east about 30" away

★★

STF1424, gamma Leo, 41 Leo, Algieba

2^m.4

3^m.6

4.7"

127°

2020

Leo

10^h19^m58.35^s / +19°50'29.40"

Christopher Hay Seeheim (Germany)	20x60	Handheld in reclining chair, binoculars with internal stabilisation. 14 May 2022 (4.7" angular distance according to database): Pear-shaped. Strong orange-lemon yellow, a fruity affair. PA estimated 140° without prior knowledge, a good enough match, considering the low magnification, to the database figure of 127° ascertained post-observation.
Christopher Hay Seeheim (Germany)	44x100	21 May 2022 (4.7" angular distance according to database): Hairfine split, slightly difficult due to bloated stars in these achromatic (not apochromatic) binoculars. Both components orange, with secondary going into yellow. Thin cloud moving through tightens up the star images and makes the split much clearer. Clearest shortly before clouds become so dense as to swallow the pair.
Christopher Hay Seeheim (Germany)	36mm (50x)	21 May 2022 (4.7" angular distance according to database): At 40x deeply notched, at 50x tenuously split, at 66x cleanly and clearly split.
Robert Zebahl Leipzig (Germany)	55mm (38x)	At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors.
Robert Zebahl Leipzig (Germany)	55mm (59x)	Very nice unequal double. A appeared yellow-orange, B rather white-bluish.
Christopher Hay Seeheim (Germany)	60mm (58x)	At 25x Algieba is already very elongated. At 58x a sliver of dark between the components, with clear brightness difference. At 70x split becomes more stable, but view not so pleasing as at 58x. Both components display vivid orange.
Robert Zebahl Leipzig (Germany)	70mm (100x)	At 67x still a relatively close pair, but well separated with quite a clear difference in brightness. At 100x easy to separate and visible color difference: A yellowish to slightly orange, B white-yellowish.
Robert Zebahl Leipzig (Germany)	102mm (125x)	Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
Stefan Loibl Rosenheim (Germany)	102mm (164x)	very bright double star, slight colour contrast
Uwe Pilz Leipzig (Germany)	105mm (120x)	schon bei 37x sehenswert; trennbar bei 55x; orange-blauweiß
Robert Zebahl Leipzig (Germany)	120mm (66x)	At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.
Winfried Kräling Marburg (Germany)	127mm (250x)	08.04.2018: merklicher Helligkeitsunterschied, A = gelb-orange, B = gelb-orange
Sarah Gebauer Germany	150mm (83x)	bei 83x sauber getrennt, ein leichter Farbunterschied (Weiß und helles Gelb) sichtbar
Mark McCarthy Fremont (California/USA)	317mm (277x)	Algieba: Bright yellow and yellow-orange pair, 1 delta mag, 4-6"
René Merting Drachhausen (Germany)	320mm (240x)	bei 240x sehe ich zwei ordentlich getrennte Sterne (naja, nicht wirklich Sterne, sondern wild zappelnde Glitzerbällchen) - Komponente A strahlt in einem zarten Gelb, B ist weiß - zurück auf 144x sehe ich nur ein Stäbchen mit leichter Einschnürung, so wild tanzen die Sterne
Mark McCarthy Fremont (California/USA)	508mm (333x)	Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire

★

STTA104

7^m.2

7^m.3

209.0"

287°

2013

LMi

10^h24^m22.19^s / +34°10'35.00"

Christopher Hay Seeheim (Germany)	7x45	Handheld. Wide, striking matched pair. Nice together with triangle of 27/28/30 LMi, and thus also easy to find. HJL1057 also in field to southwest. Delicate colour contrast in the triangle makes this a very attractive field: 30 LMi is yellowish-white, 28 reddish-white, 27 LMi colder. In 15x45 binoculars STTA104 becomes almost too wide to feel it is a double, but the colour contrasts in the triangle become clearer.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-11: Very wide pair of similarly bright components, unremarkable color. The double star stands close to the stars 27, 28 & 30 LMi and is probably more appealing in smaller binoculars.

STF1466, 35 Sex

6^m.2

7^m.1

6.8"

240°

2019

Sex

10^h43^m20.91^s / +04°44'51.60"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein wunderschönes dicht stehendes Pärchen, knapp getrennt - Helligkeitsunterschied eine halbe Größenklasse - leichter Farbkontrast, A leicht gelblich
Robert Zebahl Leipzig (Germany)	102mm (28x)	Very nice view. At 28x obviously unequal and easy to split. A appeared slightly orange. At 86x B appeared grey-blue.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Orange and a little blue, wide separation, bright, half a delta mag.
Mark McCarthy Fremont (California/USA)	508mm (333x)	35 Sex. Easy, wide, yellow-orange pair, ~2 delta mag. AC much further separated and 1 delta mag. [SkyTools showed a close CD pair: Hint of elongation with 533x, elongation is larger but more hazy at 1067x, but not resolved into stars -- but this one not in Stelle Doppie.]

★

42 LMi

S612

5^m.3

7^m.8

196.4"

174°

2019

LMi

10^h45^m51.91^s / +30°40'56.60"

ARN3

5^m.3

8^m.3

424.6"

94°

2013

Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. Panning around in the area the triangle of ABC is immediately striking. Component A cold-white, B reddish, C no particular colour.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-11: Wide, striking triple system, which can be well observed with binoculars. A: quite bright, rather white, B: slightly orange, C: tending to orange.
Mark McCarthy Fremont (California/USA)	80mm (13x)	AB: Very widely separated, split in finder (196"!). white A with a slightly red B

S617

6^m.2

8^m.7

35.2"

179°

2017

Leo

10^h53^m24.96^s / -02°15'18.80"

René Merting Drachhausen (Germany)	18x70	unauffällig - Komponente B ist ordentlich getrennt südlich von A erkennbar - Helligkeitsunterschied eine Magnitude (2.49 mag lt. Stelle Doppie!) - A reinweiß, B grau
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-03-31: Clearly separated with distinct difference in brightness. Color wise unremarkable. Nearby there is a brighter star.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ist B im Süden von A mit ordentlich Abstand erkennbar - A ist warmweiß, leicht gelblich, die deutlich schwächere Komponente B wirkt farblos - das Sternpaar ist interessant in Kombination mit dem unmittelbar nordöstlich stehenden gelblich strahlenden Stern Rho? Leo
Mark McCarthy Fremont (California/USA)	317mm (340x)	Yellow A, blue B, wide separation

★

STF1487, 54 Leo

4^m.5

6^m.3

6.6"

112°

2020

Leo

10^h55^m36.80^s / +24°44'59.00"

Robert Zebahl Leipzig (Germany)	55mm (27x)	At 27x split, but very tight with noticeable difference in brightness. At 71x easy to separate. No visible color difference.
Robert Zebahl Leipzig (Germany)	70mm (67x)	2021-04-13: At 67x beautifully separated with clearly visible difference in brightness. Very attractive is the subtle color difference: light yellow & light blue. At 133x the color of the companion is a bit more pale: grey-blue. The primary component still shines in a beautiful light yellow.
Winfried Kräling Marburg (Germany)	127mm (250x)	13.03.2017: Hauptkomponente gelblich, Begleiter bläulich, deutlicher Helligkeitsunterschied. Ebenfalls bei V=60x getrennt.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Bright white pair (4.5, 6.3) wide sep (6")
Mark McCarthy Fremont (California/USA)	508mm (333x)	54 Leo. Brilliant pair, light white-yellow stars, ~2 delta mag, wide

★★

BU1077, alpha UMa, 50 UMa, Dubhe

2^m.0

5^m.0

0.8"

342°

2017

UMa

11^h03^m43.84^s / +61°45'04.00"

2^m.0

7^m.2

384.5"

206°

2020

Christopher Hay Seeheim (Germany)	7x45	AC: AC: Very wide apart but still feel as if belonging together. A golden-yellow, C seems blue, a very attractive pair. A, B and C are a physical triple system at a distance to us of 123 light years. This is incidentally almost exactly the same distance to us as SMA75 AB, a further wide binocular pair in UMa.
René Merting Drachhausen (Germany)	18x70	AC: Dubhe oder Alpha Ursae Majoris - hm, naja - C zeigt sich im Süden in Riesenabstand zum intensivgelbem A - Komponente C wirkt dagegen wie eine graue Maus und der Helligkeitsunterschied ist so enorm, dass er nicht abschätzbar ist
Christopher Hay Seeheim (Germany)	36mm (8x)	A wide pair but still appearing visually to belong together. Component A is a creamy gold-white. Component C is pale blue, but the colour impression fades after looking for a while. In parallel observation with 3-inch at 32x and 7-inch at 67x I see no particular colour of C, an interesting difference to observation with one-and-a-half-inch. I take a look with 7x42 binoculars and the blue impression is there again, as always with binoculars of all kinds.
Robert Zebahl Leipzig (Germany)	70mm (22x)	AC: 2020-04-07: Very wide, uneven & inconspicuous pair. A appeared white-yellowish, for C I could not detect any color.
Uwe Pilz Leipzig (Germany)	120mm (120x)
Robert Zebahl Leipzig (Germany)	152mm (43x)	AC: 2022-04-12: Very wide and uneven pair. Component A shines in a bright, brilliant orange, companion C looks rather white.
Robert Zebahl Leipzig (Germany)	152mm (200x)	AB: 2022-04-12: At magnifications between 200x and 400x, there was nothing even close to a double star to be seen. The air was simply too turbulent.

★

STF1517 & BU1431

STF1517

7^m.5

8^m.0

0.7"

313°

2018

Leo

11^h13^m40.99^s / +20°07'43.30"

BU1431

AB-C

7^m.5

10^m.8

246.1"

97°

2015

Sarah Gebauer Germany	100mm (200x)	STF1517 (AB): die Komponenten AB und C lassen sich natürlich problemlos bei geringer Vergrößerung trennen, für A und B reichen auch 200x nicht aus (Beobachtungsversuch erfolgte ohne vorherige Recherche, denn 0,7'' schafft mein Refraktor nicht)
Robert Zebahl Leipzig (Germany)	102mm (187x)	STF1517 (AB): 2020-03-28: At 187x the double star immediately appears elongated, but without notching. On closer observation, the slight difference in brightness could be detected. Not better at higher magnifications. Observation at quite good seeing (4/5).
Uwe Pilz Leipzig (Germany)	105mm (200x)	STF1517 (AB): länglich
Robert Zebahl Leipzig (Germany)	152mm (225x)	STF1517 (AB): 2020-03-27: Clearly elongated. In some moments the double star appeared notched with a small difference in brightness. Observation at moderate seeing (3/5).
Mark McCarthy Fremont (California/USA)	317mm (340x)	STF1517 (AB): Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy Fremont (California/USA)	508mm (533x)	STF1517 (AB): Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal

★★

STF1523, xi UMa, 53 UMa, Alula Australis

4^m.3

4^m.8

2.3"

152°

2020

UMa

11^h18^m10.90^s / +31°31'45.00"

Robert Zebahl Leipzig (Germany)	55mm (83x)	2019-02-09: Already seen as '8' at 83x. At 125x the overlapping of both Airy disks was visible, but also a slight difference in brightness.
Robert Zebahl Leipzig (Germany)	70mm (100x)	2018-02-18: Very close together with similar brightness. At first glance seen as an '8', looking closer I partly split both components. Similar view also at 128x.
Robert Zebahl Leipzig (Germany)	70mm (133x)	2020-03-15: Splendid sight! Beautifully separated with almost touching diffraction disks. The rather small difference in brightness was well visible. The diffraction rings of both components coalesced.
Mark McCarthy Fremont (California/USA)	80mm (150x)	Alula australis. Slight magnitude difference, hairline split, light yellow A and darker yellow B.
Robert Zebahl Leipzig (Germany)	102mm (160x)	2020-03-16: Awesome! Bright with lovely, subtle diffraction rings. The distance between both components is a smaller than the diameter of the diffraction disk of the fainter component.
Uwe Pilz Leipzig (Germany)	105mm (288x)	Gemessen: 162°
Robert Zebahl Leipzig (Germany)	120mm (168x)	2018-02-14: Well split with slight difference in brightness.
Robert Zebahl Leipzig (Germany)	152mm (129x)	2019-02-06: Well split with visible difference in brightness. The colors of both components appeared equal.
Mark McCarthy Fremont (California/USA)	508mm (333x)	Alula Australis. Short period. Pretty orange-yellow stars, ~half delta mag, ~2" separation

★

STF1536, iota Leo, 78 Leo

4^m.1

6^m.7

2.2"

93°

2019

Leo

11^h23^m55.37^s / +10°31'46.90"

AB-C

4^m.1

11^m.1

332.1"

346°

2015

Robert Zebahl Leipzig (Germany)	70mm (133x)	AB: 2020-03-28: The companion was well visible as brightening on the diffraction ring of the primary component. Sketch see observation with my 102mm refractor.
Sarah Gebauer Germany	100mm (200x)	AB: selbst bei 200x nur manchmal getrennt, eher schwierig mit Amiciprisma
Robert Zebahl Leipzig (Germany)	102mm (125x)	AB: 2020-03-28: At 125x clearly separated. A very beautiful sight! The companion was visible as almost round brightening close to the first diffraction ring of the primary component. The diffraction ring itself appeared very fine. At 224x also a very nice sight with a clear diffraction ring and the companion, which now appeared roundish.
Mark McCarthy Fremont (California/USA)	317mm (340x)	AB: Quite close, very bright yellow white A and brownish B, split in A's diffraction ring
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: Iota Leo. Light orange A and a richer orange B, ~2 delta mag, ~2" separation

★★

STF1540, 83 Leo

6^m.5

7^m.5

28.6"

146°

2019

Leo

11^h26^m45.32^s / +03°00'47.20"

Stefan Loibl Rosenheim (Germany)	10x50	clearly split, little difference in magnitude
Christopher Hay Seeheim (Germany)	10x56	On tripod. Neat split. Attractive 6.3° FOV with a sprinkling of several 5- to 7-mag stars to the south. Tau Leo widely split directly to southeast. In 15x60 on tripod well split, component A slightly orange, forms a fine double-double with Tau Leo. 83 Leo is a physical double at a distance to us of only 58 light years.
Robert Zebahl Leipzig (Germany)	16x70	2021-03-02: Splendid sight together with the double star tau Leo as well as 82 Leo. Beautiful star field. 83 Leo very nicely separated with moderate difference in brightness. Yellowish orange & slightly orange.
René Merting Drachhausen (Germany)	18x70	ein ordentlich getrenntes und dennoch schön eng stehendes Pärchen - Komponente A ist leicht gelblich, Komponente B im SO ist eine dreiviertel Magnitude schwächer und grauweiß
Robert Zebahl Leipzig (Germany)	55mm (16x)	Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather grey-bluish.
Mark McCarthy Fremont (California/USA)	80mm (13x)	Finder split, in same field as Tau.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Light orange-yellow A and light blue B, >1 delta mag, very wide. Physical with 32,000-year period. Running this through the Plot Tool with EDR3 data, it confirms it is physical, only 18 parsecs / 58 light years away (which is why it has such a high proper motion) and 520 AU separation
Mark McCarthy Fremont (California/USA)	317mm (340x)	Yellow A and reddish B wide separation.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x steht das Paar zwar weit auseinander, es wirkt aber trotzdem gut zusammengehörend - Komponente B im SO ist eine dreiviertel Magnitude schwächer

★★

STFA19, 84 Leo, tau Leo

5^m.0

7^m.5

89.2"

181°

2019

Leo

11^h27^m56.23^s / +02°51'22.50"

Christopher Hay Seeheim (Germany)	7x50	On tripod. Comfortably split. Component A is mildly orangish-yellow. Can't quite eke out 83 Leo's secondary (NELM 5m0, elevation 40°).
Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. Wide pair. Component A dull golden-yellow, component B seems bluish. Attractive. In 15x60 on tripod very wide. Component A very mild orange, B grey-blue. Fine sight in 3.3° FOV together with well-split 83 Leo.
Robert Zebahl Leipzig (Germany)	16x70	2021-03-02: Splendid sight together with the double star 83 Leo as well as 82 Leo. Beautiful star field. Tau Leo beautifully separated with significant difference in brightness. Yellowish & bluish.
Robert Zebahl Leipzig (Germany)	55mm (16x)	Wonderful double with slight color contrast in a very nice field. Together with 83 Leo stunning view. Noticeable unequal. A appeared white-yellowish with a hint of orange, B grey-bluish.
Mark McCarthy Fremont (California/USA)	80mm (13x)	Finder split, the A star is prismatic in color effects, bluish B
Mark McCarthy Fremont (California/USA)	317mm (340x)	Bright yellow A, bluish B, very widely separated

★

STF1547, 88 Leo

6^m.3

9^m.1

15.7"

330°

2020

Leo

11^h31^m44.94^s / +14°21'52.20"

Robert Zebahl Leipzig (Germany)	55mm (42x)	Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x erscheint Komponente B nordwestlich von A etwas mehr als knapp getrennt ganz schwach, bestimmt 3 Größenklassen Helligkeitsunterschied - Komponente A warmweiß, B ist grau
Sarah Gebauer Germany	100mm (45x)	fein, aber gut getrennt, die südliche Komponente ist deutlich heller, die nordwestliche zeigt sich als ganz schwacher Punkt
Uwe Pilz Leipzig (Germany)	105mm (88x)	gelb und violett
Mark McCarthy Fremont (California/USA)	178mm (205x)	Very light yellow and 2 delta, very wide B. Physical, with a 3453-year period, it is also close-by at 23.33 pc
Gerd Kohler Langenzenn (Germany)	254mm (76x)	Der Doppelstern ist getrennt.Bläulich-weiß - orange-leicht rötlich. Etwas schwächerer Begleiter.
Mark McCarthy Fremont (California/USA)	317mm (340x)	88 Leonis: A favorite! Yellow and blue pair, wide
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x ein schönes enges Sternpaar, ordentlich getrennt - Komponente A strahlt hellgelb, B ist deutlich schwächer und empfiehlt sich mit einem Kupferton - ein schöner Farbkontrast

★★★

STF1552, 90 Leo

6^m.3

7^m.3

3.1"

209°

2018

Leo

11^h34^m42.50^s / +16°47'48.90"

6^m.3

9^m.8

63.4"

235°

2018

Robert Zebahl Leipzig (Germany)	55mm (42x)	AB: A and B very tight and unequal. Much fainter component C very wide apart. All components almost in line. Very nice view.
Sarah Gebauer Germany	100mm (136x)	lange Zeit nach der ersten Beobachtung nun auch die Komponenten A und B getrennt, was bei 136x gut gelingt
René Merting Drachhausen (Germany)	100mm (142x)	AB: bei 64x wirken die Komponenten A und B wie eine 8 - bei 142x dann die Gewissheit, B ist jetzt allein erkennbar, vom Positionswinkel südwestlich, aber etwas südlicher als C - Helligkeitsunterschied eine dreiviertel Größenklasse - B wirkt hellorange gegen die weiße Komponente A AC: bei 32x ist Komponente C ziemlich weit südwestlich von A erkennbar - Helligkeitsunterschied mindestens 2.5 Größenklassen
Uwe Pilz Leipzig (Germany)	105mm (88x)	bläulich und violett
Sarah Gebauer Germany	150mm (30x)	AB: einfach zu trennen, erst bei 83x, dann auch bei 30x, sehr feine Punkte mit sichtbarem Helligkeitsunterschied
Mark McCarthy Fremont (California/USA)	317mm (170x)	AB: 90 Leonis, a close but easily split pair at 170x, a yellow-white A and a bluish-white B.
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: 90 Leo. Blazing white pair, ~1 delta mag, ~3"

★

STF1555 & HJ503

STF1555

6^m.4

6^m.8

0.7"

151°

2019

Leo

11^h36^m17.94^s / +27°46'52.70"

HJ503

AB-C

5^m.8

11^m.2

22.5"

156°

2016

Frederik Wanink Itterbeck (Germany)	254mm (640x)	STF1555 (AB): blickweise gerade eben trennbar
Mark McCarthy Fremont (California/USA)	317mm (443x)	STF1555 (AB): Nice! AB tight hair-split white pair, with fainter & wide separated AB-C in a row to the east.
Mark McCarthy Fremont (California/USA)	317mm (443x)	HJ503 (AB-C): Nice! STF 1555AB tight hair-split white pair, with fainter & wide separated C in a row to the east.
Mark McCarthy Fremont (California/USA)	508mm (553x)	STF1555 (AB): Hairline split at 333x, clear split with 533x, very close ~0.5", bright. Part of plus one

★★

STF1559

6^m.8

8^m.0

2.0"

326°

2019

UMa

11^h38^m49.11^s / +64°20'49.40"

Robert Zebahl Leipzig (Germany)	70mm (133x)	2020-04-14: Two clearly visible, slightly touching diffraction disks. The fainter companion appeared somewhat more diffuse. Occasionally the double star appeared separated.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Very striking colors, A is a strong blue-white, and 2 delta mag B is a reddish orange color, about 3" separation, a very great pair!

STF1565

7^m.3

8^m.4

22.2"

304°

2017

Leo

11^h39^m36.50^s / +18°59'48.30"

Christopher Hay Seeheim (Germany)	15x60	Well split. Primary warmer in tone, secondary colder. No visual competition whatsoever in 3.3° FOV, making the delicate pair rather charming. A physical double at the substantial distance to us of 2175 light years.
Robert Zebahl Leipzig (Germany)	16x70	2021-03-02: Moderately bright, clear difference in brightness, attractive separation, striking. The primary component shines in a beautiful yellow with a touch of orange, the tiny companion just greyish.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2021-04-21: At 22x very nicely separated with moderate difference in brightness. White-yellowish & grey-blue. At 44x similar color impression: slightly yellowish & slightly bluish.
Sarah Gebauer Germany	100mm (45x)	weit und deutlich getrennt, die westliche Komponente minimal schwächer als die östliche zu sehen
Uwe Pilz Leipzig (Germany)	105mm (21x)	gelb und rot

★

BU603

6^m.0

8^m.5

1.0"

329°

2019

Leo

11^h48^m38.71^s / +14°17'03.20"

Mark McCarthy Fremont (California/USA)	80mm (150x)	Elongated but not split. 129-year period
Uwe Pilz Leipzig (Germany)	105mm (200x)	sehr schwierig
Uwe Pilz Leipzig (Germany)	105mm (288x)	nicht getrennt
Mark McCarthy Fremont (California/USA)	203mm (533x)	Suspected at 205x and 333x but needed higher magnification to see it. B is a very small point, with seeing, in the first diffraction ring. ~1" and ~3 delta mag

★

STF1579, 65 UMa

AB-C

6^m.7

8^m.3

3.9"

43°

2019

UMa

11^h55^m05.74^s / +46°28'36.60"

AB-D

6^m.7

7^m.0

62.5"

114°

2018

Christopher Hay Seeheim (Germany)	7x45	AB-D: Handheld. A bit difficult due to hand tremor, but clearly split with definite delta-mag. Nice in 8.6° FOV together with 67 UMa (Forgeren), which for its part has a bluish companion at a separation of about 300". With 15x45 stabilised binoculars AB-D is an easy wide split, AB warmer, D colder in hue. A physical pair at a distance to us of 691 light years.
Robert Zebahl Leipzig (Germany)	8x40	AB-D: 2020-04-05: Immediately conspicuous in the field. Medium bright double star with slightly uneven components. Western component AB appeared slightly orange, component D tended to be bluish.
Robert Zebahl Leipzig (Germany)	55mm (27x)	AB-D: Easy to separate with large distance and very small difference in brightness. The D component showed a bluish tint, the lighter one (AB) a slightly yellowish tint. At higher magnification also the faint C component is visible.
Robert Zebahl Leipzig (Germany)	55mm (83x)	2019-02-09: AB, C & D easy to split, but the faint C component only appeared as a tiny star. To the south there is the brighter D component.

Robert Zebahl

Leipzig (Germany)

STF1600

7^m.6

8^m.3

7.8"

92°

2016

UMa

12^h05^m34.42^s / +51°55'52.20"

Robert Zebahl Leipzig (Germany)	70mm (44x)	2020-04-19: Uneven pair. At 22x medium bright and still pretty tight. At 44x beautiful sight: pale orange, grey-bluish.
Sarah Gebauer Germany	100mm (73x)	zweifarbig, bei 73x sauber getrennt, wenn auch nadelfein, die westliche Komponente ist orange, die östliche blau
Mark McCarthy Fremont (California/USA)	178mm (205x)	Easy white-yellow Struve, half delta mag, wide
Mark McCarthy Fremont (California/USA)	317mm (277x)	Pretty orange and blue pair, 8-9 mag, 1.5 delta mag, wide separation ~10"

STF1662

7^m.8

9^m.8

19.2"

242°

2017

UMa

12^h35^m48.64^s / +56°34'42.40"

Sarah Gebauer

Germany

100mm (73x)

Teil eines Dreiecks, so schwach, dass man sie kaum sieht

../projects/double-stars/sarah-gebauer/sketches/STF%201662.jpg

★★★

STF1670, gamma Vir, 29 Vir, Porrima

3^m.5

2.5"

4°

2020

Vir

12^h41^m39.60^s / -01°26'57.90"

Christopher Hay Seeheim (Germany)	15x60	28 February 2021 at 3" separation: Very slight elongation. PA estimated at 5° (thus only 9° off, which seems fairly precise to me considering the low power of 15x and the minimal elongation, both of which make PA estimation difficult). Intentionally flashed the eyes on the almost full Moon directly prior to observation in order to enhance acuity. Compared the sight of Porrima repeatedly with that of similarly bright Epsilon Vir (Vindemiatrix) to check whether the elongation is perhaps an artefact of the bincolulars or of my eyes, but no elongation seen there.
Robert Zebahl Leipzig (Germany)	16x70	2021-05-23: Not even close to appear as a double star. The components are just too bright, the separation too small.
Robert Zebahl Leipzig (Germany)	55mm (56x)	2019-05-18: At 38x slightly elongated. At 56x touching diffraction disks. At 71x clearly separated with very small gap.
Robert Zebahl Leipzig (Germany)	70mm (44x)	2021-05-26: At full aperture Porrima appears almost separated at 44x. The two diffraction disks are well visible. At 31x it is difficult to see any elongation at all. At 40mm aperture Porrima can be seen clearly elongated already at 31x, from 67x it appears as an '8'. At only 22x Porrima is not visible as a double star.
Robert Zebahl Leipzig (Germany)	70mm (104x)	2019-05-04: At 47x clearly visible as '8', at 73x split with almost touching diffraction disks. At 104x clearly separated, equally bright and pretty close together. The gap was smaller than the diameter of the diffraction disk.
Mark McCarthy Fremont (California/USA)	80mm (92x)	Porrima. Nice and easy, yellow-white equal stars. 169-year period
Robert Zebahl Leipzig (Germany)	102mm (125x)	2019-05-01: Extremely nice double star! Equally bright and relatively close together. Both components appeared yellowish-white.
Uwe Pilz Leipzig (Germany)	105mm (200x)	weiß-weiß, die nördliche Komponente ist eine Winzigkeit heller
Winfried Kräling Marburg (Germany)	127mm (146x)	21.04.2018: Bei V=100x erscheint dieser orangefarbene Doppelstern bereits als „8“. Bei V=146x ist Porrima voll getrennt.
Sarah Gebauer Germany	150mm (166x)	die 2,8'' entfernten Komponenten A und B konnten haarscharf bei 83x und 166x getrennt werden, beide strahlen gleich hell als ganz dichte Glanzpünktchen; Komponenten E und F wurden gesehen, C und D allerdings nicht; bei 83x waren AB ganz knapp nicht mehr voneinander getrennt
Mark McCarthy Fremont (California/USA)	178mm (205x)	Porrima. Bright near equal, dull white, well split about 4". Physical with a 169-year period, I missed my chance to witness the rapid periastron a few years ago
Mark McCarthy Fremont (California/USA)	317mm (170x)	Porrima. Very pretty yellow-white, near equal, close split at 170x. Star disks improved with apodizing mask.

★

STF1685

7^m.3

7^m.8

16.0"

202°

2018

Com

12^h51^m54.80^s / +19°10'19.90"

René Merting Drachhausen (Germany)	18x70	ein schicker FG-Doppelstern - ein enges Paar mit der leicht schwächeren Komponente B im Süden - schwacher Farbkontrast, der wieder mal zwischen den Sternen hin und her zu springen scheint
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-04: Lovely sight! Beautifully separated with little difference in brightness. Together with two other brighter stars the double star forms an almost right-angled triangle. At 44x the primary component appears in pale orange, the companion rather grey-bluish.
Christopher Hay Seeheim (Germany)	125mm (64x)	Wide split. Component A bluish, B warmer. Well-matched pair. A physical double at a distance to us of 722 light years.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Brighter white A, 0.5 delta mag B, pretty wide separation.

★★

STF1692, 12 CVn, alpha CVn, Cor Caroli

2^m.9

5^m.5

19.3"

230°

2020

CVn

12^h56^m01.67^s / +38°19'06.20"

Christopher Hay Seeheim (Germany)	11x80	Difficult, but definitely split. Interesting to compare directly with Zeta UMa (Alcor): the latter very close to separation, but not quite there.
Robert Zebahl Leipzig (Germany)	70mm (22x)	Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, companion silvery-white.
Christopher Hay Seeheim (Germany)	76mm (17x)	Clearly split. Primary slightly yellowish. Secondary too close to get a clear colour impression, but seems grey-blue in good moments.
Mark McCarthy Fremont (California/USA)	80mm (92x)	Cor Caroli, showpiece, almost three detla mag and nicely split. Nice round star images
René Merting Drachhausen (Germany)	100mm (32x)	bei 64x ein auffälliger Doppelstern - A ist gleißend weiß, B im Südwesten ist 1.5 Größenklassen schwächer (2.67 mag lt. Stelle Doppie, schon zum zweiten Mal vertan hier)
Uwe Pilz Leipzig (Germany)	105mm (66x)	blauweiß-orange, trennbar bei 16x
Uwe Pilz Leipzig (Germany)	105mm (200x)	schon bei 26x getrennt
Robert Zebahl Leipzig (Germany)	114mm (28x)	Well split with big difference in brightness.
Sarah Gebauer Germany	150mm (83x)	deutlicher Helligkeitsunterschied, sehr einfach zu trennen
Mark McCarthy Fremont (California/USA)	203mm (205x)	Cream white and light canary yellow. Well separated, 2 delta mag.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Cor Caroli: Cream white and light canary yellow. Well separated, 2 delta mag.
Gerd Kohler Langenzenn (Germany)	254mm (76x)	Weiß-leicht bläulich - leicht orange rötlich. Kleiner Helligkeitsunterschied.
Mark McCarthy Fremont (California/USA)	317mm (71x)	Cor Caroli. Cream and bluish, use low power to fit STF 1688 & STF 1702 in the same field
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein schönes Pärchen - A ist weiß - B zeigt sich gut getrennt südwestlich von A, ist gut 1.5 Größenklassen schwächer (2.67 mag laut Stelle Doppie) und mit einem leichten Stich ins gelbliche (warmweiß) - zurück auf 20x eine ungleiche 8, bei 32x knapp getrennt

Berthold Fuchs Wiesbaden (Germany)	130mm	easy DS
Frederik Wanink Itterbeck (Germany)	254mm

★★

HU644

9^m.1

9^m.9

0.1"

354°

2019

CVn

13^h19^m45.58^s / +47°46'41.10"

Uwe Pilz Leipzig (Germany)	120mm (250x)
Mark McCarthy Fremont (California/USA)	317mm (443x)	Orange-red pair, near equal mag, split with seeing at 443x
Mark McCarthy Fremont (California/USA)	508mm (533x)	Quite perfect star images, light orange stars, nearly 2 delta mag, well separated, PA northwest. Grade 2, physical, 48.776-year period. It has a slightly out of round orbit from our perspective, near it's periastron now and will widen to an easy 1.584" by 2030

STF1740

7^m.1

7^m.4

25.6"

75°

2018

Vir

13^h23^m39.16^s / +02°43'24.00"

Stefan Loibl Rosenheim (Germany)	10x50	close double star for binoculars, clearly split, component A slightly reddish
René Merting Drachhausen (Germany)	18x70	ein auffälliges, schön eng zusammen stehendes Sternpaar - Komponente B im Osten ist nur knapp schwächer
Robert Zebahl Leipzig (Germany)	70mm (33x)	Easy to separate, slightly unequal with moderate angular distance. A: pale orange, B: color not clearly perceptible.
Uwe Pilz Leipzig (Germany)	105mm (88x)	gelb und orange, der westliche ist einen Hauch heller. Schon auffallend bei 2x, sehr schön bei 88x
Mark McCarthy Fremont (California/USA)	203mm (333x)	hair split equal white pair. Suspected elongation at 205x but needed 333x to split. 667x too much power given the conditions.

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201740.png

★★

STF1744 & SMR4, zeta UMa

STF1744, 79 UMa, Mizar

2^m.2

3^m.9

14.7"

154°

2020

UMa

13^h23^m55.42^s / +54°55'31.50"

STF1744, Mizar & Alcor

2^m.2

4^m.0

715.5"

73°

2020

SMR4

2^m.2

7^m.6

498.1"

103°

2020

Christopher Hay Seeheim (Germany)	naked eye	AC: Mizar/Alcor: After seeing the two stars separated for the first time under clear corona skies in spring 2020, this became a regular and easy sighting. Naked-eye star splitting is a skill that develops rapidly with practice. Mizar and Alcor are wide apart with my 60-year-old eyes, and occasionally Alcor appears slightly bluish.
Christopher Hay Seeheim (Germany)	7x50	On tripod. Mizar (AB) is an uneven figure-8, the smaller circle of the 8 pointing to an estimated PA of 150°. Without knowing that this is a double star one might think the binoculars have collimation issues, but Epsilon UMa displays a perfect little Airy disk. Alcor (C) appears bluish, Mizar creamy-white. D seems reddish.
René Merting Drachhausen (Germany)	8x30	AC: ein ultraweit getrenntes Pärchen - Komponente C im NO schätze ich eine Größenklasse schwächer ein (1.78 mag laut stelle Doppie)\AD: Komponente D (SMR4) ist östlich der beiden Sterne ganz schwach erkennbar, D steht dabei näher zu C
Robert Zebahl Leipzig (Germany)	8x40	AB: 2020-04-05: Even with tripod not separable.
Christopher Hay Seeheim (Germany)	10x56	AB: On tripod. Touching stars with a sliver of black in-between in good moments. Very aesthetic 6.3° field of view together with a little star group around 82 UMa.
Christopher Hay Seeheim (Germany)	12x24	AB: On tripod. Very finely split, but stable.
Christopher Hay Seeheim (Germany)	15x45	AB: Binoculars with internal stabilisation, handheld. AB nicely split with strong difference in magnitudes between A and B, very pretty.
René Merting Drachhausen (Germany)	15x56	AB: Komponente B ist südöstlich von A erkennbar, der Stern klebt noch an A, deutliche Einschnürung, aber noch keine Trennung\AC: ja, was soll ich sagen, klar sehe ich die beiden Sterne getrennt ;-), manche schaffen das mit bloßem Auge, ich nicht\AD: D ist leicht nach Süden versetzt zwischen A und C erkennbar, die mit Abstand schwächste der vier sichtbaren Komponenten
Christopher Hay Seeheim (Germany)	42mm (12x)	AB: At 6.3x substantially elongated with clear positions of the brighter/darker components. At 10.7x a very stretched figure-eight tantalisingly close to popping apart. At 12x cleanly split with a stable sliver of black between A and B.
Robert Zebahl Leipzig (Germany)	70mm (10x)	AB: 2020-04-12: Observation from city with a 70/400mm ED refractor, for which I made aperture masks from 10mm to 60mm. Goal was to find the minimum magnification for a successful split. 70mm: At 12.5x no separation of the components possible due to outshining. Grey filters brought a slight improvement, but again no separation or elongation was visible. 60mm: At 12.5x slight outshining of the companion, clearly elongated and almost separated. 50mm: At 12.5x the companion was almost outshined. A separation was just possible. 40mm: At 12.5x both components appear finely separated from each other. 30mm: At 10x not clearly separable due to outshining, but clearly elongated. At 12.5x then quite easy to separate with a fine star rendition. 20mm: At 10x the companion is still clearly visible, but quite close to the primary component. At 12.5x best view under the used apertures with a very fine rendition! 10mm: At 10x the companion appears very faint. Separation possible, but extremely tight. At 12.5x reasonably well separated.
Robert Zebahl Leipzig (Germany)	70mm (22x)	AB: 2020-04-11: At 12x no separation possible, because the bright primary component outshines the companion. At 22x clearly separated, but still quite close together.
Robert Zebahl Leipzig (Germany)	102mm (28x)	First pastel sketch (Pitt pastel by Faber-Castell) of a double star on black paper, where also the halos were sketched around the stars. The stars themselves were redrawn with an Edding (Edding 1500, Soft Pastel white). The sketch shows the components A to D.
Uwe Pilz Leipzig (Germany)	105mm (288x)	AB: mit viel Schwarz zwischen den Beugungsscheiben (1“9)
Jörg S. Schlimmer Germany	127mm (87x)	easy to split
Sarah Gebauer Germany	150mm (83x)	AB: einfacher, aber sehr schöner Doppelstern, Komponenten A und B mit 14,4'' Abstand stehen mit schönen Feldsternen zusammen im Bild
René Merting Drachhausen (Germany)	320mm (45x)	drei wunderschöne Juwelen strahlen mich an, A und B knapp getrennt, C weit entfernt im Nordosten von den beiden - Komponente B wirkt weißgelblich gegen die kühlweiß strahlende A-Komponente - Komponente D, die zwischen AB und C steht, wirkt eher grauweiß

Robert Zebahl Leipzig (Germany)
Werner E. Celnik Rheinberg (Germany)	120mm

STF1757

7^m.8

8^m.8

1.6"

144°

2019

Vir

13^h34^m16.38^s / -00°18'49.80"

Uwe Pilz Leipzig (Germany)	105mm (200x)	schwierig
Mark McCarthy Fremont (California/USA)	203mm (205x)	Close, ~2", a dull orange, ~1.5 delta mag.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange-yellow, half a delta mag, pretty, ~1.5"

★

25 CVn

STF1768

5^m.0

7^m.0

1.6"

95°

2020

CVn

13^h37^m27.70^s / +36°17'41.40"

STF1768

5^m.0

11^m.6

214.3"

321°

2015

KZA73

5^m.0

13^m.0

335.6"

92°

2015

KZA73

5^m.0

12^m.7

371.6"

139°

2020

KZA73

5^m.0

9^m.4

437.3"

118°

2015

Robert Zebahl Leipzig (Germany)	60mm (160x)	AB: 2020-03-16: 102/1122mm ED refractor stopped down to 60mm. The diffraction ring of the primary component is virtually invisible. The companion appears only in few moments as an extremely faint, elongated brightening in the diffraction ring. Very difficult. Telescope should be in very good optical condition!
Robert Zebahl Leipzig (Germany)	70mm (160x)	AB: 2020-03-16: 102/1122mm ED refractor stopped down to 70mm. Companion only visible as a subtle, elongated, not permanently visible brightening. The diffraction ring of the primary component is only visible occasionally. Difficult. Telescope should be in good optical condition!
Robert Zebahl Leipzig (Germany)	80mm (160x)	AB: 2020-03-16: 102/1122mm ED refractor stopped down to 80mm. Companion permanently visible as elongated brightening in the diffraction ring. But the diffraction ring itself appears rather faint. Moderately difficult.
Robert Zebahl Leipzig (Germany)	90mm (160x)	AB: 2020-03-16: 102/1122mm ED refractor stopped down to 90mm. Companion quite clearly recognizable as elongated brightening in diffraction ring. Relatively simple.
Robert Zebahl Leipzig (Germany)	102mm (160x)	AB: 2020-03-16: The faint companion is immediately recognizable as a distinct, slightly elongated brightening in the diffraction ring. Easy.
Robert Zebahl Leipzig (Germany)	152mm (150x)	AB: 2020-03-19: At 150x the clearly fainter companion is visible as a roundish brightening. Due to the chromatic aberration of the achromat (152mm f/5.9) the companion is almost outshined. At 180x the companion is then well, at 225x and 300x very well visible as a tiny separated star.
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: Very tight pair, a little more than hairline split, ~2 delta mag.
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: Very tight pair, a little more than hairline split, ~2 delta mag. 8" 333x: white and dull blue, ~1", Nice!
Frederik Wanink Itterbeck (Germany)	254mm (640x)	AB: schwierig wegen Helligkeitsunterschied
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Very pretty pale yellow and orange, 2-3 delta mag, ~2"

★★

STF1777, 84 Vir

5^m.5

8^m.3

2.7"

227°

2016

Vir

13^h43^m03.71^s / +03°32'16.40"

Uwe Pilz Leipzig (Germany)	105mm (200x)	deutliche Aufhellung im 1. Ring, nicht sonderlich schwierig
Mark McCarthy Fremont (California/USA)	203mm (333x)	Light orange and blue-green B, large magnitude difference, ~3". Pretty.
Gerd Kohler Langenzenn (Germany)	254mm (218x)	Blasses rot - eventuell rötlich. Enges Paar. Deutlicher Helligkeitsunterschied.

★★

STF1821, kappa Boo, 17 Boo, Asellus Tertius

4^m.5

6^m.6

13.8"

235°

2019

Boo

14^h13^m29.00^s / +51°47'23.80"

Christopher Hay Seeheim (Germany)	15x60	On tripod. Fine split. Attractive together with well-split Iota Boo in 3.3° FOV. Iota, Kappa, Theta were called Aselli by Johannes Bayer in the 17th century, meaning The Donkeys. The group is found easily naked-eye under a 5mag sky. Kappa Boo is Asellus Tertius, The Third Donkey. A physical double at a distance to us of 163 light years.
René Merting Drachhausen (Germany)	18x70	Komponente A strahlt so hell, dass B deutlich schwächer ganz knapp im SW von A abgesetzt sichtbar ist - Helligkeitsunterschied schätzungsweise 3 Magnituden (nur 2.09 mag laut Stelle Doppie)
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-24: Clearly separated with significant difference in brightness. The primary component showed a pale yellowish-orange color with a greyish companion. To the southeast there is the double star STFA 26.
Sarah Gebauer Germany	100mm (73x)	sehr schön zusammen mit STFA 26 in einem Gesichtsfeld bei 73x, dabei sehr schön getrennt
Uwe Pilz Leipzig (Germany)	105mm (144x)	weiß-grau, trennbar bei 22x
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x schicker Anblick und schön zusammen im Gesichtsfeld mit sehr ähnlichen Doppelstern STTA 26 - hier aber eine knappere Trennung und B steht im Südwesten von A - ähnlicher Farbkontrast wie beim Nachbardoppelstern, A ist weiß-gelb, B ist blau-grau
Karsten Kopp Köln (Germany)	600mm (180x)	Im CLT leicht zu trennen. Beider Sterne erscheinen weißlich.

★

STF1816

7^m.4

7^m.8

0.4"

100°

2019

Boo

14^h13^m54.63^s / +29°06'19.50"

Uwe Pilz Leipzig (Germany)	105mm (88x)	gelb
Mark McCarthy Fremont (California/USA)	178mm (533x)	Notched elongation, unequal pair, seeing won't support higher magnification. Physical with 1340-year period, it is near periastron now and will remain there the rest of my lifetime
Mark McCarthy Fremont (California/USA)	317mm (553x)	Rod-shaped equal white. July 2017

STF1829

8^m.1

8^m.6

5.6"

151°

2019

Boo

14^h15^m27.95^s / +50°26'24.60"

Robert Zebahl Leipzig (Germany)	16x70	2021-03-21: Clearly elongated, felt almost separated.
Sarah Gebauer Germany	100mm (73x)	nadelfein getrennt, bildet die Ecke des Buchstabens L, das (mit Amiciprisma) auf dem Kopf steht
Uwe Pilz Leipzig (Germany)	105mm (144x)	einfach
Mark McCarthy Fremont (California/USA)	317mm (553x)	Near equal white wide.

★★

STF1830 & STF1831

STF1831

7^m.2

9^m.6

5.8"

138°

2017

UMa

14^h16^m08.47^s / +56°42'45.70"

STF1831

7^m.2

6^m.7

112.2"

219°

2017

STF1831

6^m.7

13^m.1

112.1"

116°

2016

STF1830

6^m.7

9^m.3

138.2"

245°

2020

STF1830

9^m.3

10^m.3

10.6"

312°

2017

STF1830

9^m.3

12^m.2

35.2"

81°

2017

Christopher Hay Seeheim (Germany)	7x45	STF1831 (AC): Wide split at 7x but still a very distinct impression of being a double. No colour impression. Two fine pinpricks of light, rather attractive in 8° FOV. According to Stelledoppie the A-C pair, at 509 light years distance to us, is the only physical pair in the whole STF 1830/1831 complex. A nice physical double for small binoculars.
Robert Zebahl Leipzig (Germany)	8x40	STF1831 (AC): 2020-04-05: Fairly wide pair with slight differences in brightness and color. C appeared slightly orange, A on the other hand slightly bluish. Comparatively bright double star, which gives a nice view.
René Merting Drachhausen (Germany)	15x56	AC: beide Sterne sind gleich hell und mehr als komfortabel voneinander getrennt\CE: Komponente E im Südwesten von C fällt ebenfalls sofort ins Auge, wenn auch der Stern deutlich schwächer ist - Abstand zu C in etwa so groß, wie der Abstand AC
Robert Zebahl Leipzig (Germany)	55mm (27x)	STF1831 (AC): 2020-04-05: Moderate difference in brightness. C: pale orange, A: subtle blue.
Robert Zebahl Leipzig (Germany)	70mm (57x)	2020-04-11: At 22x the components AB, C, E & F are well visible and widely separated. E & F are comparatively faint. The C component in the middle appeared white-yellowish, AB rather white with a slight tendency to blue. At 57x, the pair AB with a clear difference in brightness can be easily split. An altogether rewarding and unusual multiple system.
Uwe Pilz Leipzig (Germany)	105mm (88x)	Komponente G erforderte 200x
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF1831 (AB): One pair close to another, 5" and 2 delta mag. Part of a widely separated equal pair, and a gang of three stars further away -- five additional pairings in the system.
René Merting Drachhausen (Germany)	320mm (72x)	EF: bei 72x ein schwaches Sternpaar, gut getrennt - E ist gelblich, F eine halbe Größenklasse schwächer und grau EG: bei 72 ist nordöstlich von EF noch ein ganz schwacher Lichtpunkt erkennbar - G hat ungefähr mit dreifachem Abstand EF
René Merting Drachhausen (Germany)	320mm (72x)	AB: bei 144x ist B ein bisschen mehr als knapp getrennt im SO von A erkennbar - B ist deutlich schwächer und grau gegen den weißgelblich strahlenden A - zurück auf 72x kann ich die beiden auch noch extrem knapp getrennt erkennen in guten Momenten - ein schönes Doppel zusammen mit STF1830 EF AC: bei 72x fällt die helle Komponente C im Südwesten von AB zwar auf, ich hätte aber nicht vermutet, dass der Stern dazu gehört

★★

STFA26, iota Boo, 21 Boo

4^m.8

7^m.4

39.0"

33°

2020

Boo

14^h16^m10.07^s / +51°22'01.30"

Robert Zebahl Leipzig (Germany)	8x40	2020-04-05: Even with tripod the faint companion was not visible.
Christopher Hay Seeheim (Germany)	15x60	On tripod. Well split, companion seems bluish. Fine 3.3° FOV star field with Kappa Boo (also split) and Theta Boo plus several 6th to 7th mag stars. Iota, Kappa, Theta were called Aselli by Johannes Bayer in the 17th century, meaning The Donkeys. The group is found easily naked-eye under a 5mag sky. Iota Boo is Asellus Secundus, The Second Donkey. A physical double at a distance to us of 95 light years.
Robert Zebahl Leipzig (Germany)	16x70	2021-03-21: Very beautifully embedded in a group of bright and medium bright stars. Significant difference in brightness. Primary component appeared white-yellowish, the much fainter companion grey-bluish at best.
René Merting Drachhausen (Germany)	18x70	ein schönes ungleiches Paar, aber Komponente B ist deutlich besser abgesetzt von A erkennbar als beim Nachbar-DS STF1821 - leichter Farbkontrast
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-24: Similar view to the northwest standing kappa Boo. Nicely separated with larger distance and fainter companion. The primary component appeared rather white.
Sarah Gebauer Germany	100mm (73x)	bei 73x weit getrennt mit sichtbarem Helligkeitsunterschied, passt zusammen mit STF1821 in ein Gesichtsfeld und ist sehr schön anzusehen
Uwe Pilz Leipzig (Germany)	105mm (144x)	sehr weit, auffallend bei 22x
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x weite Trennung der beiden Protagonisten - Komponente B im Nordwesten ist mehr als zwei Größenklassen schwächer - leichter Farbkontrast gelb-weiß vs. grau-weiß

STT281

7^m.7

9^m.7

1.5"

166°

2017

Boo

14^h20^m20.85^s / +08°34'56.30"

Uwe Pilz Leipzig (Germany)	105mm (200x)	der Begleiter ist schwach und schwierig
Mark McCarthy Fremont (California/USA)	203mm (333x)	Very fine, but well split, huge delta mag, surprise!

★

STF1850

7^m.1

7^m.6

25.2"

263°

2018

Boo

14^h28^m33.29^s / +28°17'25.90"

Robert Zebahl Leipzig (Germany)	8x40	2020-04-05: Separated, but still quite close together with a moderate difference in brightness.
Christopher Hay Seeheim (Germany)	15x45	Handheld, binoculars with internal stabilisation. A tight pair, indirect vision helps to see black in-between. Eastern component clearly brighter. Nice in 4.5° FOV with Rho and Sigma Boo. A physical double at a distance to us of 1140 light years.
René Merting Drachhausen (Germany)	16x70	ein gut getrenntes Paar zweier gleich heller Sterne - beide weiß
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-24: Easily separated, medium bright with rather small difference in brightness and moderate distance. Fairly conspicuous. The components appeared white-yellowish and white-bluish. Beautiful double star.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x locker getrennt - Komponente B ist vielleicht eine halbe Magnitude schwächer als A und strahlt ein wenig dumpfer bzw. weniger weiß
Uwe Pilz Leipzig (Germany)	120mm (72x)	recht weit, schöner Farbkontrast
Mark McCarthy Fremont (California/USA)	178mm (205x)	Near equal white wide. WDS claims physical, and their parallax do overlap, however they are separated by 7168 AU, too far than the known 5000 AU limit of known orbital pairs

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201850.jpg

★

STF1863

7^m.7

7^m.8

0.6"

63°

2018

Boo

14^h38^m00.71^s / +51°34'42.10"

Robert Zebahl Leipzig (Germany)	102mm (280x)	2021-05-16: The double star appeared elongated with an estimated position angle of 60°.
Christopher Hay Seeheim (Germany)	180mm (200x)	30 May 2021, current separation 0.65” according to Stelledoppie. No prior PA knowledge nor knowledge of relative brightnesses. Constant elongation seen. Definite determination of position of the primary within the elongation, more definite than the relative brightnesses (consulted after observation) would have led me to expect. PA estimated at 60°. In good moments fragments of a pear-shaped first diffraction ring surround the system, particularly on the side of the primary. An interesting and attractive sight.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	gerade trennbar

★★

zeta Boo

STF1865

4^m.5

0.2"

278°

2020

Boo

14^h41^m08.92^s / +13°43'42.00"

H6 104

AB-C

4^m.5

11^m.0

104.3"

259°

2020

Uwe Pilz Leipzig (Germany)	105mm (88x)	AB-C
Uwe Pilz Leipzig (Germany)	120mm (250x)	AB
Mark McCarthy Fremont (California/USA)	508mm (1067x)	AB: Zeta Boo. Short period. First impression was moderately well notched overlapping disks (eg. not barely notched, but not strongly notched either). With more time observing & getting used to the image, and in moments of better seeing, the notch became more distinct. It would not separate in spite of moments of better seeing. I could also see the elongation, but only subtly notched due to the smaller scale, at 667x

STF1878, DL Dra

6^m.3

9^m.2

4.2"

314°

2019

Dra

14^h42^m03.25^s / +61°15'42.90"

Uwe Pilz Leipzig (Germany)	105mm (198x)	starke Aufhellung im ersten Ring
René Merting Drachhausen (Germany)	320mm (144x)	bei 144x sieht der Doppelstern genauso aus wie der benachbarte östlich stehende STF 1882 bei 45x - B steht knapp abgesetzt im Nordwesten von A und ist 2 Größenklassen schwächer (2.83 mag laut Stelle Doppie) - leichter Farbkontrast

★★

STF1877, epsilon Boo, Izar

2^m.6

4^m.8

2.9"

347°

2020

Boo

14^h44^m59.14^s / +27°04'29.90"

Robert Zebahl Leipzig (Germany)	55mm (125x)	The fainter component was seen as permanent brightening on the first diffraction ring of the primary component.
Robert Zebahl Leipzig (Germany)	60mm (192x)	Easy to split, whereby the much fainter component lies on the first diffraction ring of the primary component. The primary component itself appeared slightly yellowish.
Robert Zebahl Leipzig (Germany)	70mm (133x)	Easy to split, very unequal. A appeared in pale orange, B was visible as a very tiny, grey star on the first diffraction ring of component A.
Christopher Hay Seeheim (Germany)	76mm (100x)	AB: Secondary sits on the first diffraction ring of the primary, and appears there as a fine blue point. Further magnification not useful, merely darkens the image.
Mark McCarthy Fremont (California/USA)	80mm (150x)	Izar: Dull yellow-orange A and dull orange B, nice round images so split easily. No parallax for the B star, so it's uncertain if physical
René Merting Drachhausen (Germany)	100mm (142x)	bei 107x erscheint die B-Komponente nordwestlich leicht angesetzt an der gelblich strahlenden Komponente A - bei 142x dann ist die Trennung komplett, B liegt schön auf einem abgesetzten Beugungskranz von Komponente A
Stefan Loibl Rosenheim (Germany)	102mm (205x)	nice contrast yellow-orange/blue
Robert Zebahl Leipzig (Germany)	102mm (224x)	2021-05-12: Primary component appears in bright orange, the well separated, much fainter companion at 187x grey-bluish, at 224x and higher in a very nice, pale blue.
Uwe Pilz Leipzig (Germany)	120mm (150x)	Orange und blau, sehr lohnend
Robert Zebahl Leipzig (Germany)	120mm (192x)	At 85x the fainter component was easily visible but not separated. At 192x well split. The fainter component was almost on the first diffraction ring of the primary component. Quite big difference in brightness. I did not looked at the color of the components.
Sarah Gebauer Germany	150mm (166x)	weder mit 166x noch mit 250x im April 2020 getrennt
Gerd Kohler Langenzenn (Germany)	254mm (346x)	Gelblich - leicht bläulich. Enges Paar. Deutlicher Helligkeitsunterschied.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	deutl. Farbkontrast blau gelb
Mark McCarthy Fremont (California/USA)	317mm (553x)	Izar: Yellow-orange and blue, very pretty, as always
Karsten Kopp Köln (Germany)	600mm (257x)	Sehr einfaches und auffälliges Objekt. Dieser Doppelstern war für mich an diesem Abend das Highlight. Vor allem, weil der schwächere hellblaue Stern gerade knapp neben den Spikes des helleren gelben Sterns steht.

Berthold Fuchs Wiesbaden (Germany)	130mm	magnificent DS
Frederik Wanink Itterbeck (Germany)	254mm

STF1881

6^m.7

8^m.8

3.5"

0°

2017

Vir

14^h47^m05.35^s / +00°58'15.20"

Uwe Pilz Leipzig (Germany)	70mm (198x)	sehr schwierig, einfach mit 105mm
Mark McCarthy Fremont (California/USA)	203mm (205x)	Blue-white and 3-4 delta mag fainter B star, dull blue color. Well separated.

★

STF1884

6^m.6

7^m.5

2.3"

55°

2020

Boo

14^h48^m23.37^s / +24°22'01.00"

Mark McCarthy Fremont (California/USA)	80mm (94x)	Extremely fine, 1 delta mag, notched, to overlapping disks at best moments. Physical with a 1398.2859-year period, it has a nearly edge-on orbit and is currently at the shorter of the two furthest reaches of its orbit
René Merting Drachhausen (Germany)	100mm (64x)	bei 64x ist der Doppelstern als 8 erkennbar, 107x reicht dann für die knappe Trennung - die B-Komponente im NO ist nur unwesentlich schwächer - ein sehenswertes Pärchen
Robert Zebahl Leipzig (Germany)	102mm (86x)	At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Prototypical pair, >1 delta mag, ~3" separation, white to off white color
Frederik Wanink Itterbeck (Germany)	254mm (640x)	einfach
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern konnte gerade so getrennt werden. Beide Sternen leuchten weißlich.

BU106, mu Lib, 7 Lib

5^m.6

6^m.6

1.9"

7°

2019

Lib

14^h49^m19.09^s / -14°08'56.30"

5^m.6

14^m.7

12.9"

294°

2000

5^m.6

14^m.1

25.7"

168°

2000

5^m.6

12^m.6

26.6"

232°

2015

Mark McCarthy Fremont (California/USA)	203mm (333x)	AB: Close, 1.5-2", half to one delta mag, off-white stars.
Gerd Kohler Langenzenn (Germany)	254mm (346x)	AB: Bläulich-weiß - bläulich-weiß. A und B haben nur einen geringen Helligkeitsunterschied.
Gerd Kohler Langenzenn (Germany)	254mm (346x)	AE: Bläulich-weiß - weiß. Stern E ist sehr schwach.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	AB: getrennt, schwierig wegen Südlage

★

STF1890, 39 Boo

6^m.3

6^m.7

2.6"

46°

2020

Boo

14^h49^m41.37^s / +48°43'15.60"

Robert Zebahl Leipzig (Germany)	70mm (67x)	2020-04-01: At 44x elongated, partly notched. At 67x split, but very tight. A difference in brightness was not seen. At 133x clearly separated with little difference in brightness. A appeared pale yellow, B rather warm-white.
Robert Zebahl Leipzig (Germany)	70mm (100x)	2020-04-18: At 57x very finely separated with extremely tightly spaced components that appeared equally bright. At 100x a very nice pair with little difference in brightness. Fantastic sight! The color of the components was slightly different: creamy-white & a touch of yellow-orange.
Robert Zebahl Leipzig (Germany)	102mm (187x)	2021-05-16: Easy. Beautiful double star with slight difference in brightness. Yellowish & rather white. I estimated the position angle to 40°.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	gleich hell
Mark McCarthy Fremont (California/USA)	317mm (553x)	Bright white pair, well split

STF1885

8^m.8

9^m.1

4.1"

146°

2017

Vir

14^h50^m33.12^s / -00°01'26.80"

Uwe Pilz

Leipzig (Germany)

120mm (128x)

gelb und lila

../projects/double-stars/uwe-pilz/sketches/210522stf1884.jpg

★

xi Boo, 37 Boo

STF1888

4^m.8

7^m.0

5.2"

297°

2020

Boo

14^h51^m23.38^s / +19°06'01.70"

STF1888

4^m.8

13^m.8

71.3"

340°

2015

STF1888

4^m.8

11^m.7

160.8"

286°

2015

ARN11

4^m.8

8^m.7

271.5"

98°

2015

ARN11

4^m.8

9^m.2

335.4"

39°

2020

STF1888

7^m.0

13^m.8

63.9"

340°

2001

STF1888

7^m.0

8^m.7

273.5"

102°

2009

Robert Zebahl Leipzig (Germany)	70mm (44x)	AB: 2020-04-24: Beautifully separated with quite a large difference in brightness in a lovely star field. The primary component shines yellowish with a faint companion.
Mark McCarthy Fremont (California/USA)	80mm (94x)	AB: Yellow A and orange B, 2 delta mag, nice. Only 22 light years distant, it is physical with a 298-year period, and will tighten the next 30 years
Sarah Gebauer Germany	150mm (83x)	AB: die 6'' entfernten Komponenten A und B konnten mühelos bei 83x getrennt werden, Komponente E war zu sehen, C, D und F waren nicht sichtbar
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: Xi Boo. Short period. Richly colored yellow and orange stars, ~1 delta mag, ~5" separation, with several other stars in view. Very pretty
Karsten Kopp Köln (Germany)	600mm (180x)	AB: Ein recht schöner Doppelstern, wobei neben dem Helligkeitsunterschied von 2,2 mag auch die Sternfarben ein schönes Gesamtbild geben. Der hellere Stern erstrahlt gelblich weiß und der schwächere orangegelb. Hier handelt es sich auch um ein recht nahes System mit 21,9 Lichtjahren Entfernung.

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/Xi%20Bootis.jpg

STT288

6^m.9

7^m.5

1.1"

160°

2019

Boo

14^h53^m23.35^s / +15°42'18.30"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Consistent split, better with seeing, ~1 delta mag, ~1" separation, blue-white stars
Frederik Wanink Itterbeck (Germany)	254mm (640x)	rel. einfach
Mark McCarthy Fremont (California/USA)	317mm (553x)	Notched / figure 8 with 277x, split with 553x.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Needed 553x to separate, resolved with the seeing. Near equal yellow-white, ~1" or less.

★

STF1909, 44 Boo

5^m.2

6^m.1

0.2"

138°

2020

Boo

15^h03^m47.30^s / +47°39'14.60"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	2015 getrennt zu sehen (1")
Mark McCarthy Fremont (California/USA)	317mm (553x)	I Boo. Figure 8 to hair split, ~0.9". This pair shrinking separation fast, will be <0.5" in a couple of years. Only 40 LY away. (July 2017)

STF1932

7^m.3

7^m.4

1.6"

267°

2019

CrB

15^h18^m20.19^s / +26°50'24.70"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	gleich hell, getrennt
Mark McCarthy Fremont (California/USA)	317mm (553x)	Near equal yellow-white, very close but clean split, ~1.5". Nice!

BU32, 6 Ser

5^m.5

8^m.8

3.4"

23°

2019

Ser

15^h21^m02.00^s / +00°42'55.20"

Robert Zebahl Leipzig (Germany)	102mm (224x)	Not split. Tried at 224x and 280x. Companion probably too faint. I had sidewalk lighting in the immediate vicinity.
Uwe Pilz Leipzig (Germany)	105mm (288x)	Der Begleiter ist sehr schwach. Auch mit 90 mm Blende noch gesehen
Mark McCarthy Fremont (California/USA)	178mm (205x)	Bright yellow A and faint B hangs there outside the diffraction, around 3". WDS says physical and it probably is: 41% parallax range overlap, 253 AU separation

★

STF1937, eta CrB

5^m.6

6^m.0

0.4"

287°

2020

CrB

15^h23^m12.23^s / +30°17'17.70"

Uwe Pilz Leipzig (Germany)	120mm (250x)	Schwierig
Mark McCarthy Fremont (California/USA)	203mm (667x)	8" 333x Suspect elongation. 8" 667x definite egg shape. 20" 667x Can't get a good focus.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	deutlich als 8 zu sehen, 2015 0,6"
Mark McCarthy Fremont (California/USA)	317mm (277x)	Close orange pair, equal mag, snowman shape
Mark McCarthy Fremont (California/USA)	317mm (553x)	Overlapping / notched orange-yellow stars. Used apodising mask.

★★★

mu Boo, 51 Boo, Alkalurops

CHR181, mu 1 Boo

Aa-Ab

4^m.3

0.1"

188°

2012

Boo

15^h24^m29.54^s / +37°22'37.10"

STFA28, mu 1 Boo

4^m.3

7^m.1

109.2"

171°

2020

STF1938, mu 2 Boo

Ba-Bb

7^m.1

7^m.6

2.2"

2°

2020

Christopher Hay Seeheim (Germany)	7x45	STFA28 (AB): Handheld. Wide split. A compact uneven pair. Component A is bluish-white. Rather charming in 8.6° FOV with Nu1/2 Boo, which has a gorgeous colour contrast, golden-orange and ice-blue, making it one of the strongest colour-contrast pairs in the sky for binoculars and greatly accentuating the sight of Mu Boo. In 15x45 binoculars STFA28 AB is very wide, component A bluish-white, B warmer.
Robert Zebahl Leipzig (Germany)	8x40	STFA28 (AB): Easily split with obvious difference in brightness.
Robert Zebahl Leipzig (Germany)	16x70	STFA28 (AB): 2021-06-14: Wide, relatively striking pair. Pale yellow & dark orange.
René Merting Drachhausen (Germany)	16x70	STFA28 (AB): weit getrenntes Pärchen, aufgrund der großen Helligkeitsunterschiedes schöner Farbkontrast - Komponente A im Norden gelblich, B im Süden mehr grau-braun
Robert Zebahl Leipzig (Germany)	70mm (22x)	STFA28 (AB): Evident, very wide apart and unequal. A: white-yellowish, B: grey.
Mark McCarthy Fremont (California/USA)	80mm (94x)	STFA28 (AB): Alkalurops Bright yellow-white A and bluish B, which is itself a slightly unequal close double, finely split (STF 1938 Ba,Bb) -- 256.5-year period, now coming off apastron
Robert Zebahl Leipzig (Germany)	102mm (125x)	Beautiful view! This triple system includes STFA 28 and STF 1938.
Uwe Pilz Leipzig (Germany)	105mm (288x)	ein heller 4m und zwei nahe dunkle 7m, lohnend.
Robert Zebahl Leipzig (Germany)	120mm (23x)	STFA28 (AB): Easy to split with large angular distance and noticeable difference in brightness.
Sarah Gebauer Germany	150mm (125x)	A-BC mit 109'' sind bei 125x sehr weit getrennt, es ist der Ansatz eines engen Doppelsterns zu erkennen, der sich mit 2,2'' Abstand auch bis 250x nicht auftrennen ließ
Christopher Hay Seeheim (Germany)	180mm (105x)	STF1938 (Ba-Bb): At 105x in poor seeing a kissing, evenly matched pair. At 180x clearly split despite the poor seeing, southern component (Ba) seems slightly brighter than Bb.
Mark McCarthy Fremont (California/USA)	203mm (205x)	STFA28 (AB): Bright A star does not seem round. The B star is a tight equal pair, pretty set. [Aa,Ab is CHR 181 0.1", and I'd be shocked if I actually detected it. STFA 28 is technically the bright star and the tight pair, the tight pair is Ba,Bb = STF 1938, 7.09/7.63, 2.2"]
Mark McCarthy Fremont (California/USA)	203mm (205x)	STFA28 (AB): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy Fremont (California/USA)	203mm (205x)	CHR181 (Aa-Ab): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy Fremont (California/USA)	203mm (205x)	STF1938 (Ba-Bb): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Frederik Wanink Itterbeck (Germany)	254mm (640x)	STF1938 (Ba-Bb): 3er System, schön
Mark McCarthy Fremont (California/USA)	317mm (277x)	STFA28 (AB): Bright white star with tight yellow pair STF 1938 as its companion.
Mark McCarthy Fremont (California/USA)	317mm (553x)	STFA28 (AB): Striking. Bright star with near equal double STF 1938 paired with it. A star is a spectroscopic binary
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF1938 (Ba-Bb): Near equal close but well split double also paired with STFA28
Karsten Kopp Köln (Germany)	600mm (257x)	Hier handelt es sich um ein Dreifachsternsystem, welches jetzt aber nicht durch eine besondere Färbung der Sterne auffällt. Die A - B/C Komponenten stehen noch sehr weit auseinander, wobei auch die A-Komponente um einiges heller erscheint. Die beiden Komponenten B/C sind wesentlich näher beieinander und unterscheiden sich auch kaum in ihrer Helligkeit.

HU149

7^m.5

7^m.6

0.7"

272°

2017

Dra

15^h24^m35.30^s / +54°12'46.10"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

mit Zwischenraum zu sehen

../projects/double-stars/frederik-wanink/sketches/HU149.jpg

COU610, 4 CrB, theta CrB

4^m.3

6^m.3

0.8"

198°

2016

CrB

15^h32^m55.78^s / +31°21'32.90"

Uwe Pilz Leipzig (Germany)	120mm (250x)	blau; gerade eben länglich, PW richtig. Richtung des schwächeren Sterns war erkennbar.
Robert Zebahl Leipzig (Germany)	152mm (300x)	2021-07-23: Theta CrB was only a few degrees above the house roof and the refractor was insufficiently cooled down. In no way visible as a double star. I used magnifications from 200x to 400x.
Mark McCarthy Fremont (California/USA)	203mm (667x)	Notched/snowman at best moments. B definitely fainter and almost blue. Very faintly split, looks like a blue appendage.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	nicht als DS gesehen
Mark McCarthy Fremont (California/USA)	317mm (738x)	Tried pretty hard at 553x with apodizing screen, but dances too much. Used 6mm ortho with barlow, 738x, and at best moment it is olive shaped, but marginal. Observation August 2018
Mark McCarthy Fremont (California/USA)	762mm (915x)	The CrB: Fractured and dancing seeing. 915x, at full aperture and with 8-inch aperture mask, I see a slight out of roundness.

STF1954, delta Ser, 13 Ser

4^m.2

5^m.2

4.0"

171°

2020

Ser

15^h34^m48.14^s / +10°32'20.00"

4^m.2

13^m.9

66.6"

18°

2014

13^m.9

14^m.6

4.0"

341°

2018

Robert Zebahl Leipzig (Germany)	70mm (57x)	AB: Easy to separate with relatively close components and a clear difference in brightness. A appeared rather white, B slightly orange.
René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 142x zwei gut getrennte reinweiße Komponenten - B wirkt eine halbe Größenklasse schwächer - zurück auf 107x ist die Trennung ebenfalls einfach - zurück auf 64x ist es eine 8 mit tiefen Einschnürungen, kurz vor der Trennung
Stefan Loibl Rosenheim (Germany)	102mm (102x)	AB: sparse field
Sarah Gebauer Germany	150mm (85x)	AB: Mit 85x schon schön getrennt, ein leichter Größenunterschied der Sterne zu erkennen, einige schwache Feldsterne im Okular bei 0,95° Gf.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	AB: getrennt, Del Ser

★

STF1965, zeta CrB, zeta 1/2 CrB

5^m.0

5^m.9

6.3"

306°

2019

CrB

15^h39^m22.68^s / +36°38'09.00"

Robert Zebahl Leipzig (Germany)	16x70	2021-06-14: A slight elongation can be guessed at best.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein knapp getrenntes deutlich helleres Pärchen als der 27' südwestlich stehende Doppelstern STF1964 - Komponente B ist gut eine Größenklasse schwächer als A - beide Komponenten schmiegen sich meist noch aneinander, aber in guten Momenten sind beide getrennt sichtbar - zurück auf 20x ist ein länglicher Stern erkennbar
Robert Zebahl Leipzig (Germany)	102mm (28x)	At 28x very tight and barely split, unequal. At 86x very nice view. No difference in color: both components appeared white.
Stefan Loibl Rosenheim (Germany)	102mm (68x)	Elongated at 28x, split with 68x. Component A blue, B reddish. At 68x double star STF1964 in the same FOV
Robert Zebahl Leipzig (Germany)	120mm (48x)	Very nice double star, well split with noticeable difference in brightness.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Bright white, well separated, ~1 delta mag.
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern konnte gut getrennt werden. Der Helligkeitsunterschied ist nicht sehr groß und der etwas hellere Stern erscheint weißlich und der schwächere geht eher ins bläulich weiße.

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/Zeta%20CrB.jpg

STF1989, pi UMi

7^m.3

8^m.2

0.7"

23°

2013

UMi

15^h39^m38.61^s / +79°58'59.60"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

blickweise als 8 zu sehen, schwierig

../projects/double-stars/frederik-wanink/sketches/pi2Umi.jpg

BU619

7^m.0

7^m.9

0.7"

357°

2019

Ser

15^h43^m10.53^s / +13°40'03.70"

Uwe Pilz

Leipzig (Germany)

120mm (250x)

../projects/double-stars/uwe-pilz/sketches/220727BU619.jpg

STF1970, beta Ser, 28 Ser

3^m.7

10^m.0

29.9"

263°

2020

Ser

15^h46^m11.21^s / +15°25'18.90"

3^m.6

11^m.0

201.7"

211°

2015

René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 64x ist B extrem schwach, aber gut abgesetzt westlich vom gleißend hellen A erkennbar - zurück auf 32x ist B auch gerade so erkennbar, noch immer gut von A getrennt
Uwe Pilz Leipzig (Germany)	120mm (162x)	AB
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Very wide separation, white A and bluish B. B looks like a planet reflecting A's light. 5 delta mag.

★★

STF1973

7^m.6

8^m.8

30.6"

321°

2021

CrB

15^h46^m24.50^s / +36°26'45.60"

René Merting Drachhausen (Germany)	18x70	ein gut getrenntes Sternpaar - Komponente A im Südosten ist doppelt so hell wie B - ganz leichter Farbkontrast
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x sind beide Sterne gut getrennt erkennbar - schöner Farbkontrast zwischen beiden ungleich hellen Sternen
Uwe Pilz Leipzig (Germany)	105mm (53x)	blaugrün-orange, trennbar bei 15x
Robert Zebahl Leipzig (Germany)	120mm (23x)	Nice double star, easy to split with noticeable difference in brightness.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Wide, 1 delta magnitude white.

★

H3 7, beta Sco

2^m.6

4^m.5

13.4"

20°

2019

Sco

16^h05^m26.23^s / -19°48'19.40"

Christopher Hay Seeheim (Germany)	15x45	Stabilised binoculars, handheld. Difficult handheld in this instrument, but clearly split and attractive as such. Tripod mounting would surely help and make the difference for a nice pair for this magnification. One of the earliest doubles split, found by Benedetto Castelli in 1627, but according to Stelledoppie not a physical double (in contrast to the very tight BU 947 AB pair in the system, which is physical, with a separation of 0.3” in 2020 and 0.4” in 2030 – and the wide PWL 9001 AD pair with a separation of 518” – A, B and D are thus a physical triple). “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 3 in the name means that it is a double star of the 3rd Class [separation 5'' - 15''] in Herschel’s system.
Sarah Gebauer Germany	150mm (85x)	unspektakulär, mit 85x einfach zu trennen, wenige Feldsterne

★★

STF2054

6^m.2

7^m.1

1.0"

350°

2018

Dra

16^h23^m47.19^s / +61°41'47.00"

Robert Zebahl Leipzig (Germany)	70mm (133x)	Not split in any way.
Robert Zebahl Leipzig (Germany)	102mm (160x)	Immediately visible as a double star. The diffraction disks overlapped slightly. The difference in brightness was clearly visible. Together with the nearby double star eta Dra in the same field of view, the sight was highly fascinating, as both double stars are very different in their appearance.
Uwe Pilz Leipzig (Germany)	105mm (198x)	verformte Beugungsscheibe, auf den ersten Blick erkennbar
Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt

★★

STT312, eta Dra, 14 Dra

2^m.8

8^m.2

4.7"

142°

2016

Dra

16^h23^m59.51^s / +61°30'50.70"

Robert Zebahl Leipzig (Germany)	70mm (133x)	Not split in any way.
Robert Zebahl Leipzig (Germany)	102mm (160x)	Easy. Very large difference in brightness. The faint companion appeared as a tiny star outside the first diffraction ring of the primary component. Highly recommended, especially with the nearby double star STF 2054!

★

lambda Oph, 10 Oph, STF2055, Marfic

4^m.2

5^m.2

1.4"

44°

2019

Oph

16^h30^m54.84^s / +01°59'02.80"

Stefan Loibl Rosenheim (Germany)	102mm (205x)	components cannot be split at 205x
Uwe Pilz Leipzig (Germany)	105mm (288x)	schöner Farbkontrast, lohnend.
Sarah Gebauer Germany	150mm (160x)	habe den Doppelstern zwar gefunden und konnte auch erkennen, dass es zwei Sterne sind, eine Trennung war aber heute Abend nicht möglich
Mark McCarthy Fremont (California/USA)	203mm (205x)	Marfic. Nice blazing white pair, ~1 delta, ~2". 129 year period, but not much change in the next few years
Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt

★

STT313

8^m.0

8^m.3

0.9"

128°

2018

Her

16^h32^m33.19^s / +40°06'47.70"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	mit Zwischenraum zu sehen
Mark McCarthy Fremont (California/USA)	317mm (553x)	Clean split, near equal pair. Nice

★★★

16/17 Dra

STF2078, 17 Dra

5^m.4

6^m.4

3.2"

104°

2020

Dra

16^h36^m13.72^s / +52°55'27.80"

STFA30, 16/17 Dra

5^m.4

5^m.5

90.2"

193°

2018

Christopher Hay Seeheim (Germany)	3x63	Clean split. Separation is much clearer than that of Nu1/2 Dra (STFA35), which is also in 14° FOV and is hair-fine split. A physical double at a distance to us of 412 light years.
Christopher Hay Seeheim (Germany)	7x45	A well split and nicely compact pair. When 16/17 Dra is put at the edge of the 8.6° field of view, Nu1/2 Dra stands at the opposite edge. Their comparison thus suggests itself. 16/17 is somewhat wider than Nu1/2. While the components of Nu1/2 are of equal brightness and whiteness, those of 16/17 display a slight difference in both brightness and colour. 17 (A) first seems bluer than 16 (C), but after 20 seconds this impression flips to C and from then on goes back and forth.
Robert Zebahl Leipzig (Germany)	55mm (27x)	STFA30 (AC): Rather wide pair with almost equal components. C component appeared slightly yellowish-orange.
Robert Zebahl Leipzig (Germany)	55mm (71x)	Grand sight!
Christopher Hay Seeheim (Germany)	80mm (30x)	16 Dra seems more bluish than 17 Dra, the latter seems slightly yellow in comparison and is distinctly elongated. At 84x 17 Dra is cleanly split and such a delightful view together with 16 Dra that I had no desire to ramp up the magnification. All three stars belong to a physical system.
René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 64x noch ein Stäbchen, bei 107x ist B dann knapp getrennt östlich von A erkennbar - B ist auch noch relativ hell bzw. maximal eine Magnitude schwächer AC: bei 32x weit auseinander stehend - Komponente C im Süden ist maximal eine viertel Magnitude schwächer - leichter Farbkontrast, A weißgelb und C kühlweiß
Frederik Wanink Itterbeck (Germany)	254mm (640x)	STF2078 (AB): sehr schönes Dreiersystem

★

STF2084, zeta Her, 40 Her

3^m.0

5^m.4

1.6"

110°

2019

Her

16^h41^m17.16^s / +31°36'09.80"

Sarah Gebauer Germany	100mm (136x)	auf Anhieb ganz haarscharf getrennt, aber leider nur wenige Sekunden haltbar; dennoch erfolgreiche Trennung!
Robert Zebahl Leipzig (Germany)	102mm (224x)	Faint companion as distinct brightening on the first diffraction ring visible. In steadier moments visible as small, round condensation.
Robert Zebahl Leipzig (Germany)	102mm (280x)	After a longer, concentrated observation, a permanent brightening of the first diffraction ring of the primary component could be seen at the correct position angle. The brightening appeared only arch-shaped without any noticeable condensation.
Uwe Pilz Leipzig (Germany)	105mm (288x)	äußerst schwierig
Uwe Pilz Leipzig (Germany)	105mm (288x)	Bei sehr ruhiger Luft ohne Probleme sichtbar, trotz der störenden Restkoma meines Refraktors
Mark McCarthy Fremont (California/USA)	152mm (285x)	Zeta Her. A lot of diffraction but there is a persistent bulge, brightening to a split, at the first diffraction ring. Suspected at 175x
Mark McCarthy Fremont (California/USA)	203mm (533x)	Zeta Her. B was seen, not too difficult as a disk within the diffraction of bright A, just outside first ring so ~1.5", like a diamond ring, significant mag difference
Frederik Wanink Itterbeck (Germany)	254mm (640x)	nicht als DS gesehen
Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt
René Merting Drachhausen (Germany)	320mm (320x)	in der Nacht konnte ich nur bis 320x gewinnbringend vergrößern - Komponente A zeigt schöne Beugungsscheibchen, B offenbarte sich mir nicht

STF2098

8^m.8

9^m.6

14.2"

145°

2017

Her

16^h45^m43.47^s / +30°00'17.20"

8^m.8

65.6"

128°

2017

8^m.8

11^m.0

67.6"

18°

2015

11^m.0

13^m.7

5.8"

268°

2015

Robert Zebahl Leipzig (Germany)	102mm (86x)	Already at 28x the components A, B and C were noticeable at first view. At 86x, component D could also be observed very well. The components are all comparatively far apart.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: 4 stars in an arc. Assume AB is the closer pair ~1 delta mag. All wide. (5 stars in 5 pairings)
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: AB, AC, AD, four star system all within a mag of each other, forming a gentle arc. (Actually 5 stars, I missed DE which is 13th mag. Says it's physical -- all 5 are?)

John Raymond

Richmond (Virginia/USA)

Taken in 2017 with 18” Dobsonian. Single images with Canon M3 camera, <30s

../projects/double-stars/john-raymond/photographs/stf2098.jpg

STF2096, 19 Oph

6^m.1

9^m.7

23.9"

88°

2019

Oph

16^h47^m09.76^s / +02°03'52.40"

6^m.1

11^m.4

214.3"

193°

2020

René Merting Drachhausen (Germany)	15x56	AB: ein sehr ungleiches Paar - das Strahlen von A lässt den Abstand zu B kleiner wirken als es die Trennungsdaten hergeben - mindestens 2.3 bis 3 Größenklassen Helligkeitsunterschied - es gibt schönere Fernglas-Doppelsterne
Uwe Pilz Leipzig (Germany)	16x70	AB: äußerst schwierig; sehenswertes Sternfeld
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x ein knapp getrenntes Pärchen, Komponente B ist sehr schwach - bei 32x dann deutliche Trennung und ästhetischerer Anblick - der Helligkeitsunterschied zwischen den Komponenten ist enorm, sicherlich mehr als 3 Magnituden
Uwe Pilz Leipzig (Germany)	105mm (200x)	Hauptkomponente gelb-orange

★★

52 Her

BU627

A-BC

4^m.8

8^m.4

2.2"

44°

2018

Her

16^h49^m14.21^s / +45°58'59.90"

A1866

9^m.5

9^m.6

0.3"

267°

2013

René Merting Drachhausen (Germany)	100mm (142x)	BU627 (A-BC): bis 142x probiert, hat nicht funktioniert - der Helligkeitsunterschied ist vermutlich zu groß und das Beugungsscheibchen von A so hell wie BC selbst
Robert Zebahl Leipzig (Germany)	102mm (280x)	BU627 (A-BC): At 160x the faint component is already beginning to be visible as brightening in the first diffraction ring. At 280x the brightening is quite clearly visible and appears partly clear as a small knot in the first diffraction ring.
Uwe Pilz Leipzig (Germany)	105mm (288x)	BU627 (A-BC)
Uwe Pilz Leipzig (Germany)	120mm (180x)	BU627 (A-BC)
Mark McCarthy Fremont (California/USA)	317mm (553x)	BU627 (A-BC): 52 Her. Very bright white star with a companion disk 2", 4-5 delta mag. Wow! B appears as if it is illuminated by A's light. Did not detect BC, 0.3"

STF2118, 20 Dra

7^m.1

7^m.3

0.9"

65°

2018

Dra

16^h56^m25.32^s / +65°02'20.60"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

sehr einfach

../projects/double-stars/frederik-wanink/sketches/20Dra.jpg

STT318

7^m.0

9^m.6

2.9"

243°

2016

Her

16^h56^m39.66^s / +14°08'24.90"

René Merting Drachhausen (Germany)	100mm (64x)	bei 64x zeigt sich das Pärchen in guten Momenten knapp getrennt - bei 107x wird Komponente B besser sichtbar, er wirkt gräulich wie ein halbdurchsichtiger Geist - die Trennung ist nun eindeutig, aber immer noch knapp - großer schwer einschätzbarer Helligkeitsunterschied zwischen A und B, gut 2.5 Größenklassen Differenz habe ich in der Nacht geschätzt, Treffer
Jörg S. Schlimmer Germany	127mm (136x)	Abstand ca. 3"Separation 3"
Mark McCarthy Fremont (California/USA)	317mm (553x)	Pretty orange pair, 3 delta mag, ~3"

STF2112

9^m.7

10^m.3

2.3"

263°

2020

Her

16^h58^m14.68^s / +31°47'27.60"

Uwe Pilz Leipzig (Germany)	105mm (200x)	Hauptkomponente grau-weiß
Mark McCarthy Fremont (California/USA)	203mm (205x)	Sharp white pair, ~2", ~1 delta mag

H4 122, V451 Her

6^m.3

10^m.3

18.9"

238°

2020

Her

17^h01^m33.05^s / +14°56'59.00"

Jörg S. Schlimmer

Germany

127mm (136x)

high contrast

../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20H%204%20122_filtered_96dpi.jpg

★★

mu Dra, 21 Dra, Alrakis, Arrakis

STF2130

5^m.7

2.5"

358°

2020

Dra

17^h05^m20.20^s / +54°28'14.30"

BU1088

5^m.7

13^m.7

12.2"

174°

2015

Christopher Hay Seeheim (Germany)	80mm (100x)	In May 2019 neatly split, no colours seen. A physical system with a period of 812 years. Periastron was in 1946, since then the distance is widening to reach 2.7“ in 2025 and 2.8“ in 2030
René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 107x zeigen sich zwei knapp getrennte Perlchen, beide gleichhell und weiß schimmernd - ein schickes Paar
Robert Zebahl Leipzig (Germany)	102mm (125x)	AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.
Uwe Pilz Leipzig (Germany)	105mm (144x)	AB
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: Mu Dra. "Arrakis" (which was the name of the planet in the book Dune, but means "Dancer" in Arabic). Light yellow-orange stars, well split, equal. 812 year period
Frederik Wanink Itterbeck (Germany)	254mm (460x)	AB: gleich hell

STF2122

6^m.4

9^m.7

20.3"

279°

2016

Oph

17^h06^m52.94^s / -01°39'22.00"

Uwe Pilz Leipzig (Germany)	16x70	konzentriertes Schauen erforderlich; der helle ist gelb
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x zeigt sich das Pärchen gut getrennt, B segelt sichtbarkeitstechnisch hart am Limit - bei 32x ist Komponente B im Westen weiter sehr schwach bzw. mindestens 2 Größenklassen schwächer - schöner Farbkontrast, weiß-gelb vs. grau-blau
Mark McCarthy Fremont (California/USA)	203mm (333x)	Pale yellow and wide separated B, 2 delta mag.

★★

STF2140, alpha Her, 64 Her, Ras Algethi

3^m.5

5^m.4

4.7"

103°

2020

Her

17^h14^m38.86^s / +14°23'24.90"

Christopher Hay Seeheim (Germany)	36mm (50x)	At 50x secondary detaches momentarily from first diffraction ring of primary as the tiniest pinprick of light, delta-mag seems massive. At 66x separation becomes much clearer. Can hold secondary 80% of the time as a fine point on the outer rim of the first diffraction ring. Primary is orange-yellow, secondary far too faint in this aperture for any kind of colour impression. Rather charming in a strange sort of way. See for comparison simultaneous observation with 210mm at 68x.
Robert Zebahl Leipzig (Germany)	55mm (41x)	Well split with noticeable difference in brightness.
René Merting Drachhausen (Germany)	100mm (64x)	bei 32x ist noch nichts erkennbar - bei 64x wird östlich von Rasalgethi der schwache Begleiter B knapp getrennt sichtbar - A ist strahlend gelb, B mit einer Tendenz zum gelb, eher ein warmes weiß
Uwe Pilz Leipzig (Germany)	105mm (88x)	himmelblau und hellgelb, getrennt bei 53x
Uwe Pilz Leipzig (Germany)	105mm (288x)	gelb-lachsfarben
Robert Zebahl Leipzig (Germany)	120mm (100x)	Easily split with noticeable difference in brightness. A: intensively orange colored, B: slightly orange.
Karsten Kopp Köln (Germany)	140mm (94x)	Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer Germany	150mm (85x)	bei Halbmond auf der Schwäbischen Alb: sehr eng, aber sauber getrennt, eine Komponente ist viel heller und größer, mein Farbeindruck ist allerdings unerwartet eher gelb
Sarah Gebauer Germany	150mm (160x)	richtig gold, es strahlt mich richtiggehend an, auch sehr schön getrennt, ein toller Doppelstern!
Mark McCarthy Fremont (California/USA)	152mm (175x)	Rasalgethi. Wow best ever view, perfect disks with no flaring. Light orange A and 2 delta mag light aqua B. Physical with a 3600-year period
Mark McCarthy Fremont (California/USA)	203mm (667x)	Rasalgethi. 8" inch mask due to seeing. AB orange and blue 4 delta mag. Faint AD seen very wide separation. pretty star.
Christopher Hay Seeheim (Germany)	210mm (68x)	Despite the primary being a little bloated in mediocre seeing, the secondary is set off clearly as a fine pinprick of light. Both are orangish-yellow. A very charming sight. See for comparison simultaneous observation with 36mm at 66x.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	gelblich und bläulicher Stern
Mark McCarthy Fremont (California/USA)	317mm (277x)	Rasalgethi, Bright orange A & pale green much fainter B. Very nice!
Karsten Kopp Köln (Germany)	600mm (135x)	Leicht zu trennen. Komponente A erscheint orange, Komponente B gelblich.
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist gut zu trennen. Komponente A erstrahlt orange und Komponente B gelblich.

Frederik Wanink Itterbeck (Germany)	254mm
Jens Leich Germany	130mm

★★

STF3127, delta Her, 65 Her

3^m.1

8^m.3

13.8"

291°

2020

Her

17^h15^m01.92^s / +24°50'22.50"

René Merting Drachhausen (Germany)	100mm (64x)	was für ein schönes ungleiches Paar - bei 64x präsentiert sich Komponente A gleißend hell und weiß, B zeigt sich gut abgesetzt westlich von A - zurück auf 32x habe ich bei der Strahlkraft von A keine Chance mehr, B zu erkennen - sehr schick ab 64x
Stefan Loibl Rosenheim (Germany)	102mm (68x)	Faint component B is not visible at 26x. At 68x B is visible and split. Component A yellowish.
Robert Zebahl Leipzig (Germany)	102mm (86x)	Easy. Pretty wide apart with large difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (667x)	Very bright yellow white A and bluish B at least four delta mag, wide separation. I don't think it would be seen but for the mask tightening A's diffraction
Mark McCarthy Fremont (California/USA)	317mm (553x)	Sarin. Very bright and much fainter B, looks like a planet
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern gut zu trennen. Der Reiz von diesem Doppelstern liegt im schon extremen Helligkeitsunterschied von über 5 mag. Komponente A erstrahlt weiß und die Komponente B leicht rötlich.

omicron Oph, 39 Oph, H3 25

5^m.2

6^m.6

10.8"

355°

2019

Oph

17^h18^m00.71^s / -24°17'12.80"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

Farbkontrast wohl wegen südl.Stellung nicht zu sehen

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

★

STF2161, 75 Her, rho Her

4^m.5

5^m.4

4.1"

321°

2019

Her

17^h23^m40.97^s / +37°08'45.30"

Robert Zebahl Leipzig (Germany)	55mm (38x)	Very nice view. Easily split with visible difference in brightness. Pretty tight. Component A appeared rather white, B slightly yellowish. The double star forms with two other, fainter field stars a conspicuous, acute-angled triangle, whereby the double star marks the tip.
René Merting Drachhausen (Germany)	100mm (64x)	bei 107x sind beide Komponenten klar getrennt erkennbar - Komponente B im NW ist eine knappe Größenklasse schwächer - A creme-weiß, B kühler weiß-bläulich - zurück auf 64x kann ich den Doppelstern auch schon ganz knapp getrennt erkennen, da war ich wohl nicht mutig genug, dass ich mit 107x begonnen habe
Sarah Gebauer Germany	150mm (170x)	der typische Doppelstern für mich, er bildet mit zwei ählich hellen Sternen ein schönes, langes und spitzes Dreieck
Mark McCarthy Fremont (California/USA)	152mm (175x)	Rho Her. Lovely cream-white stars, half delta mag, nice split
Mark McCarthy Fremont (California/USA)	203mm (667x)	Rho Her. Light yellow white stars 1 delta mag well separated.

STF2166

7^m.2

8^m.6

27.0"

282°

2017

Oph

17^h27^m52.25^s / +11°23'25.80"

Uwe Pilz Leipzig (Germany)	105mm (88x)	trennbar bei 22x
Mark McCarthy Fremont (California/USA)	152mm (175x)	Blue-white A and wide 1 delta mag red B. WDS says physical and that's probably correct, 41% parallax range overlap and 3,225 AU weighted separation. 2.03/1.47 stellar mass
Mark McCarthy Fremont (California/USA)	203mm (333x)	White and slight off-white wide separation B.

★★

STFA35, nu Dra, nu 1/2 Dra, 24/25 Dra

4^m.9

62.1"

311°

2017

Dra

17^h32^m15.88^s / +55°10'22.10"

Christopher Hay Seeheim (Germany)	3x63	Hair-fine split. A physical double at a distance to us of 99 light years.
Christopher Hay Seeheim (Germany)	7x45	Well split and very compact. A very evenly matched pair, both colourless. Attractive in 8.6° FOV together with the rest of the head of the dragon, namely Beta, Gamma and Xi Dra (Rastaban, Etamin, Grumium).
Christopher Hay Seeheim (Germany)	10x42	Clearly split, components of identical brightness, no colour. One of the finest doubles for 10x.
René Merting Drachhausen (Germany)	16x70	der Doppelstern ist bereits mit bloßem Auge zu erkennen, im FG dann offenbart sich ein ordentlich getrenntes Pärchen zweier gleich heller Sterne
René Merting Drachhausen (Germany)	18x70	zwei sehr helle reinweiße Sterne, komfortabel voneinander getrennt - sehr auffällig
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein schönes, auffallendes Pärchen zweier gleich heller Sterne - beide sind komfortabel getrennt erkennbar und präsentieren sich weiß
Sarah Gebauer Germany	100mm (50x)	Nu1 und Nu2 Draconis starrt mich so richtig eindringlich als Augenpaar an, sie stehen in einem ansonsten ganz leeren, schwarzen Umfeld
Robert Zebahl Leipzig (Germany)	102mm (28x)	Wide, bright, equal pair. Both components looked cream-white. Due to the distance a double for binoculars.
Christopher Hay Seeheim (Germany)	125mm (80x)	Gorgeous sight, widely split, dominating the FOV. The more northern B-component (=Nu1 Dra = 24 Dra) appears brighter and more yellowish than the A-component (=Nu2 Dra = 25 Dra).
Sarah Gebauer Germany	150mm (85x)	auf den ersten Blick "zwei Augen", die mich anleuchten, ansonsten aufgrund der wenigen Feldsterne eher unspektakulär

STFA34, 53 Oph

5^m.8

7^m.5

41.3"

190°

2019

Oph

17^h34^m36.69^s / +09°35'12.20"

5^m.8

11^m.9

96.6"

343°

2013

5^m.8

12^m.0

127.0"

213°

2020

7^m.5

12^m.0

90.6"

223°

2015

René Merting Drachhausen (Germany)	16x70	AB: gut getrenntes Pärchen, bei dem Komponente B im Süden deutlich schwächer und grau gegenüber A wirkt
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x weit getrenntes helles Pärchen, wobei Komponente B im Süden gut 1.5 Größenklassen schwächer - Komponente weiß-gelb, B gräulich
Uwe Pilz Leipzig (Germany)	105mm (88x)	AB: weiß und blaugrau. Trennbar bei 22x

★

STF2191

7^m.8

8^m.5

26.4"

267°

2018

Oph

17^h39^m47.28^s / -04°58'04.80"

Uwe Pilz Leipzig (Germany)	16x70	schwierig aber sehenswert
Mark McCarthy Fremont (California/USA)	203mm (667x)	Wide separation near equal (AB seen. BC is Ho 419 12.71 7.6" not seen)

STF2203

7^m.7

7^m.8

0.8"

292°

2018

Her

17^h41^m13.81^s / +41°39'17.80"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

getrennt

../projects/double-stars/frederik-wanink/sketches/STF2203.jpg

★★★

STF2202, 61 Oph

6^m.1

6^m.5

20.8"

93°

2019

Oph

17^h44^m34.09^s / +02°34'45.90"

René Merting Drachhausen (Germany)	8x30	die B-Komponente ist östlich von A erkennbar, lässt sich aber noch nicht trennen - eine klassische Ameise
René Merting Drachhausen (Germany)	10x35	ein richtig schöner Doppelstern für 10-fache Vergrößerung - zwei gleich helle Sterne, knapp getrennt
René Merting Drachhausen (Germany)	10x50	ein ausgesprochen schönes knapp getrenntes Sternpaar - beide Sterne sind in etwas gleich hell - Komponente B im Osten ist nicht ganz so weiß wie A
René Merting Drachhausen (Germany)	15x56	wunderschön - ein sauber getrenntes Sternpaar, wobei B im Osten nur minimal schwächer wirkt - beide Sterne zeigen sich strahlend weiß
René Merting Drachhausen (Germany)	16x70	ein schön eng stehendes Pärchen, knapp getrennt - Komponente A im Westen ist nur leicht heller als B - beide Komponenten wirken weiß
Uwe Pilz Leipzig (Germany)	16x70	beide gelb
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x leicht zu trennen - Komponente B im Osten ist nur minimal schwächer (keine halbe Größenklasse, denke ich) - Komponente A stahlt ein wenig wärmer als B
Sarah Gebauer Germany	150mm (30x)	bei geringer Vergrößerung (30x) schon sauber getrennt, beide Sterne wirken gleich groß und gleich hell, ein nettes Pärchen
Sarah Gebauer Germany	150mm (54x)	zwei nicht ganz enge Glanzpünktchen in einer eher uninteressanten Umgebung
Mark McCarthy Fremont (California/USA)	203mm (667x)	Half delta mag wide separation white.

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/61%20Ophiuchi.png

★

STT338

7^m.2

7^m.4

0.9"

168°

2018

Her

17^h51^m58.46^s / +15°19'34.90"

Uwe Pilz Leipzig (Germany)	120mm (250x)
Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt
Mark McCarthy Fremont (California/USA)	317mm (553x)	Just split, a pair of bright near equal orange stars.
Mark McCarthy Fremont (California/USA)	508mm (667x)	Yellow-white very clean split stars seem more equal than what the data says

★★★

S694

6^m.7

7^m.3

79.3"

238°

2018

Oph

17^h52^m05.20^s / +01°06'40.30"

René Merting Drachhausen (Germany)	15x56	ein idealer FG-Doppelstern mit schön anzusehendem Farbkontrast - Komponente A im Osten strahlt reinweiß, hat ordentlich Abstand ist eine halbe Magnitude schwächer und wirkt weißgrau, fraglich wo bei diesen Farben der Farbkontrast herkommen soll, das Pärchen entfaltet trotzdem diese Wirkung
Uwe Pilz Leipzig (Germany)	16x70	gelbweiß und blau; identisch WDS1752+0107

★★

STF2308

40/41 Dra

5^m.7

6^m.0

18.7"

232°

2019

Dra

18^h00^m09.07^s / +80°00'13.70"

5^m.7

8^m.3

225.3"

129°

2017

Robert Zebahl Leipzig (Germany)	8x44	2020-06-27: The pair AB split, but very tight with components of equal brightness. In acute angle far apart the component C was also visible.
Christopher Hay Seeheim (Germany)	15x45	AB: Clearly split, brighter component seems bluish. One of the finest doubles for 15x, hence my two-star rating. In 10x42 a difficult split at the limit.
René Merting Drachhausen (Germany)	16x70	ein schön eng stehendes Pärchen, die Himmelsrichtungen erschließen sich mir hier leider nicht, aber die Komponenten sind beide ähnlich hell und weiß - schöner Anblick im Fernglas
Christopher Hay Seeheim (Germany)	50mm (8x)	AB: An elongated figure-8 very close to splitting
Christopher Hay Seeheim (Germany)	80mm (30x)	AB: Very clearly split, dominates the 2.5° FOV, with interesting sprinkling of fainter stars throughout the field.
Robert Zebahl Leipzig (Germany)	102mm (28x)	Very nice, slightly uneven pair. Components appeared yellowish-white. Beautiful surroundings. On the sketch the components A, B and C are visible.
Uwe Pilz Leipzig (Germany)	105mm (100x)	AB: =40/41 Dra. Auffallend
Christopher Hay Seeheim (Germany)	140mm (75x)	AB: Wide apart, the pair absolutely dominates the field of view, with attractive sprinkling of fainter stars to the west. Very delicate colour contrast that was hard to grasp in 3-inch scope now becomes clear, component B (40 Dra) is bluish, component A (41 Dra) yellowish.

★

H6 2, 67 Oph

4^m.0

8^m.1

54.7"

143°

2019

Oph

18^h00^m38.72^s / +02°55'53.70"

René Merting Drachhausen (Germany)	10x35	zwischen beide Sterne passt maximal ein halbes Blatt Papier - C im Südosten kommt mir entgegen aller früheren Erfahrungen nicht so schwach vor wie sonst, ich würde hier nur auf maximal eine Größenklasse schätzen, eigenartig
René Merting Drachhausen (Germany)	10x50	ein einfacher Doppelstern - Komponente C steht mit gutem Abstand südöstlich von A - Komponente A ist gleißend weiß, C wirkt dagegen richtiggehend grau-braun
Christopher Hay Seeheim (Germany)	15x45	Stabilised binoculars, handheld. Components wide apart, almost too wide to appear as a double star. Secondary a fine speck of light beside the primary, which is >4mag brighter. According to Stelledoppie a true physical pair at a distance of 1230 light years. It is interesting to contemplate that at this distance in space the companion still looks so separate. “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 6 in the name means that it is a double star of the 6th Class [separation 1’ or larger] in Herschel’s system.
René Merting Drachhausen (Germany)	16x70	auf den ersten Blick bin ich enttäuscht, weil ich nur einen hell strahlenden Stern erkennen kann - dann aber mit etwas Konzentration ist südöstlich von der Leuchtgranate ein ganz schwacher Begleiter zu erkennen - ein sehr ungleiches Paar mit geschätzt 4 Größenklassen Unterschied - Komponente C wirkt rotbraun und steht ordentlich getrennt von A
Uwe Pilz Leipzig (Germany)	16x70	der helle ist gelb-weiß
Christopher Hay Seeheim (Germany)	25x80	Very far apart, almost so far as to appear to not belong together. However, in the 3° field of view 70 Ophiuchi, which is also a physical double, is seen to be also split. Thus a very attractive field overall. 67 Oph and 70 Oph are the left and right nostrils of the bull in the old constellation Taurus Poniatowski (Poniatowski’s Bull). 68 Oph (the tip of the bull’s nose) and 73 Oph (the bull’s right eye) are also double stars, but can’t be split at 25x. All four doubles – 67, 68, 70 and 73 Oph – are physical, a rare assemblage!
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x großer Abstand zwischen beiden Sternen - weil Komponente A so gleißend hell strahlt, fehlt der mindestens um 3 Größenklassen schwächeren Komponente C im SO die Farbe, eher gräulich

STF2264, 95 Her

4^m.8

5^m.2

6.4"

255°

2020

Her

18^h01^m30.41^s / +21°35'44.80"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x mein erster Eindruck ist, dass zwei annähernd gleichhelle sehr eng stehende Sterne mich wie zwei Augen anschauen, das unmittelbare Sternumfeld passt schön und verleiht dem Doppel eine hervorgehobene Stellung - Komponente B im Westen ist nur minimal schwächer als A - in guten Momenten ist die Trennung sehr eindeutig erkennbar
René Merting Drachhausen (Germany)	100mm (64x)	bei 64x zwei helle, knapp getrennte Sterne - die schwächere westliche Komponente zeigt ein schönes, helles Gelb und wirkt dadurch leicht schwächer - zurück auf 32x ist eine 8 mit deutlicher Einschnürung erkennbar - der Farbunterschied ist ebenfalls deutlich
Uwe Pilz Leipzig (Germany)	105mm (288x)
Karsten Kopp Köln (Germany)	140mm (94x)	Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer Germany	150mm (54x)	zwei enge, hübsche Glanzpünktchen, die ich zuvor ziemlich lange in dem hellen Sterntrapez gesucht habe
Robert Zebahl Leipzig (Germany)	152mm (49x)	2020-06-23: At 49x eye catching double star, relatively tight with rather small difference in brightness. Beautiful color impression, which was even better visible at 69x: yellowish and yellowish-orange.
Mark McCarthy Fremont (California/USA)	508mm (667x)	95 Her. Orange and blue, wide, bright.
Karsten Kopp Köln (Germany)	600mm (135x)	Sehr einfaches und auffälliges Objekt. Kein Helligkeitsunterschied erkennbar.

Berthold Fuchs Wiesbaden (Germany)	130mm	close DS
Frederik Wanink Itterbeck (Germany)	254mm

STF2262, tau Oph

5^m.3

5^m.9

1.5"

290°

2019

Oph

18^h03^m04.91^s / -08°10'48.90"

Frederik Wanink

Itterbeck (Germany)

254mm (240x)

getrennt

../projects/double-stars/frederik-wanink/sketches/STF2262.jpg

70 Oph, P Oph, STF2272

4^m.2

6^m.2

6.6"

122°

2019

Oph

18^h05^m27.37^s / +02°29'59.30"

Uwe Pilz Leipzig (Germany)	16x70	nicht einfach; der helle ist gelb
Christopher Hay Seeheim (Germany)	25x80	Clean split, component A appears yellowish. 70 Oph is the left nostril of the bull in the old constellation Taurus Poniatowski (Poniatowski’s Bull). On the connections to 67, 68 and 73 Oph see the entry on 67 Oph.
René Merting Drachhausen (Germany)	100mm (64x)	bei 32x wirkt der Stern nicht rund, sondern ein wenig nach SO verschmiert - bei 64x dann eindeutig ein knapp getrenntes schön anzusehendes Pärchen - Komponente A hell-gelb, B orange-gelb
Jörg S. Schlimmer Germany	127mm (136x)	easy to split
Sarah Gebauer Germany	150mm (85x)	ein ganz leicht goldener Farbeindruck des Sternpaares, die Sterne stehen recht dicht beisammen und sind dennoch schön getrennt
Robert Zebahl Leipzig (Germany)	200mm (80x)	Conditions in the target region: SQM-L 20.1 Well split at 80x. Brighter component appeared white, fainter one slightly orange.

Berthold Fuchs

Wiesbaden (Germany)

130mm

difficult DS

../projects/double-stars/berthold-fuchs/photographs/70%20Ophiuchi.png

★

STF2280, 100 Her

5^m.8

14.3"

183°

2019

Her

18^h07^m49.56^s / +26°06'04.40"

René Merting Drachhausen (Germany)	10x35	ein 8, eine Einschnürung ist ab und an erkennbar - Trennung nicht möglich
René Merting Drachhausen (Germany)	10x50	zwei extrem dicht stehende helle Sterne - noch nicht getrennt, aber schön als 8 erkennbar
Robert Zebahl Leipzig (Germany)	16x70	2020-07-05: Very nice, rather isolated double star. Striking. Similar bright component, both white.
René Merting Drachhausen (Germany)	18x70	perfekt für 18-fache Vergrößerung - zwei gleich helle, dicht zusammen stehende Sterne - reinweiß und sehr auffällig, weil keine ähnlich hellen Sterne im Umfeld zu sehen sind
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein schönes, enges Pärchen zweier gleichheller Sterne - beide gleich hell und reinweiß - zurück auf 20x zeigen sich beide Protagonisten weiterhin ganz knapp getrennt - Komponente B im Süden wirkt leicht gelblich und schwächer
Uwe Pilz Leipzig (Germany)	105mm (26x)	Weiß-orangeweiß
Robert Zebahl Leipzig (Germany)	120mm (40x)	Conditions in the target region: SQM-L 20.5 Very nice, evident double star with equally bright components.
Karsten Kopp Köln (Germany)	140mm (94x)	Doppelstern ist einfach zu trennen. Das besondere ist hier, dass die beiden Sterne recht alleine zu stehen scheinen. Beide erscheinen weiß.
Sarah Gebauer Germany	150mm (54x)	zwei hübsche Glanzpünktchen, die mich an ein Knöpflein mit zwei Löchern erinnern, der "typische" DS für mich: nicht zu eng, nicht zu weit, gleich hell, sehr nett
Robert Zebahl Leipzig (Germany)	152mm (22x)	Beautiful view. Easy to separate with components of the same brightness. It is noticeable that there are no brighter stars in the immediate vicinity, so that the double star stands out very well.
Mark McCarthy Fremont (California/USA)	203mm (205x)	100 Her. Bright equal wide yellow-white stars. [not physical]

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/100%20Herculis.png

STF2281, 73 Oph

6^m.0

7^m.5

0.8"

283°

2019

Oph

18^h09^m33.86^s / +03°59'35.80"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

als 8 zu sehen, schwierig

../projects/double-stars/frederik-wanink/sketches/73Oph.jpg

★★

HU674

7^m.7

8^m.6

0.7"

214°

2018

Her

18^h09^m40.64^s / +50°24'07.40"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt, ähnlich hell
Mark McCarthy Fremont (California/USA)	508mm (333x)	Split with seeing at 333x, near equal white.

STF2289

6^m.7

7^m.2

1.2"

218°

2019

Her

18^h10^m08.69^s / +16°28'35.00"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Just split in 20" at 205x, but flaring. 333x had messy diffraction. 8" mask at 333x gave clean disks, split, ~0.7". Dull yellow and yellow-red colors.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	Hauptstern gelb, Begleiter scheint bläulich

★★★

BU641

7^m.0

8^m.7

0.8"

341°

2015

Her

18^h21^m48.44^s / +21°30'27.90"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	sehr schwierig
Mark McCarthy Fremont (California/USA)	317mm (553x)	Extraordinary! Moderately bright A and very much fainter B, 4-5 delta mag, <1" separation. Seeing needs to still.
Mark McCarthy Fremont (California/USA)	508mm (533x)	V989 Her. Seen as a snowman dot to bright white A @ 333x, split with 533x, inside first diffraction ring. Need A's disk to be perfectly tight for B to resolve with seeing. Very nice. 1" at discovery 1878 with Dearborn 18.5-inch

★

STF2323, 39 Dra

5^m.1

8^m.1

3.6"

348°

2020

Dra

18^h23^m54.65^s / +58°48'02.10"

5^m.1

8^m.0

88.9"

20°

2020

Robert Zebahl Leipzig (Germany)	55mm (27x)	AC: Pretty wide, unequal pair. Die brighter A component appeared white.
Robert Zebahl Leipzig (Germany)	55mm (71x)	AB: Very nice. The B component seemed to be comparable faint as the C component.
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: 39 Dra. Brilliant white A and slightly ruddy B, ~3 delta mag, ~4" sep. 3962.5 year period.

★

STF2315

6^m.6

7^m.8

0.6"

117°

2018

Her

18^h24^m58.46^s / +27°23'41.30"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	als 8 zu sehen
Mark McCarthy Fremont (California/USA)	317mm (277x)	! Hairline split @ 553x near equal mag. Suspected elongation at 277x.:
Mark McCarthy Fremont (California/USA)	508mm (533x)	Barely split with seeing, resolves to two disks, more than hairline but almost 2 delta mag, very tough, need perfect seeing. 2094 year period

STT351 & HU66

HU66

7^m.9

8^m.4

0.2"

197°

2016

Dra

18^h25^m18.20^s / +48°45'42.50"

STT351

7^m.9

8^m.2

0.8"

26°

2019

HU66

8^m.4

8^m.2

0.8"

26°

2019

Mark McCarthy Fremont (California/USA)	203mm (305x)	STT351 (AC): Split, better with seeing, light orange stars, significant mag difference. Did not notice HU 66 AB, 7.9/8.4 0.1" or HU 66 BC, 8.40/8.25 0.9 -- need to go back to this one!
Frederik Wanink Itterbeck (Germany)	254mm (640x)	HU66 (BC): getrennt
Mark McCarthy Fremont (California/USA)	317mm (553x)	HU66 (BC): Very fine near equal pair, yellowish A and blue-white B. ~1" or less.
Mark McCarthy Fremont (California/USA)	508mm (333x)	STT351 (AC): Orange stars, noticeable magnitude difference ~0.5, separated just less than ~1". What's curious is the AB pair is HU 66 AB listed as 7.90/8.40 0.1" currently, with HU 66 BC as 8.40/8.25 0.9". So my question is, if AC is physical, and if BC are physical too, why is AC uncertain? It would seem they should all be sharing orbits? Perhaps it just cries out for additional measures -- AB is grade 4 and BC is grade 5, so they are confident of physicality but there's not enough data to nail it down.

★

STF2320

7^m.1

8^m.9

0.9"

1°

2015

Her

18^h27^m45.89^s / +24°41'50.80"

Mark McCarthy Fremont (California/USA)	203mm (667x)	V994 Her. Seen with the 20", but used the 8" mask to clean up the images. Two delta mag, ~1" very nice pair. [eclipsing binary of Algol type--surely not seeing the eclipsing star? In fact, both A & B each are eclipsing binaries, the first such system to be discovered in the whole sky!]
Frederik Wanink Itterbeck (Germany)	254mm (640x)
Mark McCarthy Fremont (California/USA)	317mm (553x)	Nice! Blue-white stars, 1", 2 delta mag.

★★

STT359

6^m.3

6^m.6

0.7"

3°

2019

Her

18^h35^m30.40^s / +23°36'19.90"

Robert Zebahl Leipzig (Germany)	102mm (160x)	2020-11-10: Clearly elongated with slight notching and little difference in brightness. I estimated the position angle to 0°.
Uwe Pilz Leipzig (Germany)	105mm (198x)	leicht eingekerbt, Abstand 0“75
Uwe Pilz Leipzig (Germany)	120mm (250x)
Mark McCarthy Fremont (California/USA)	152mm (175x)	Light orange near equal stars, notched elongation, overlapping disks. Physical with a 219-year period, at apastron now
Mark McCarthy Fremont (California/USA)	203mm (667x)	Kissing 8" 333x, hairline split 667x. Near equal white A and bluish white B.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	getrennt
Mark McCarthy Fremont (California/USA)	317mm (553x)	Nice! ~0.8" equal yellow-orange stars.
Uwe Pilz Leipzig (Germany)	320mm (388x)	ein sehr ruhiger Abend gestattete die Nutzung von 12 Zoll
Mark McCarthy Fremont (California/USA)	508mm (333x)	Light yellow near equal split, very close. 219 year period

STF2349

5^m.4

9^m.4

7.2"

204°

2016

Lyr

18^h36^m37.34^s / +33°28'08.50"

Robert Zebahl Leipzig (Germany)	102mm (125x)	Easy to split with a clear difference in brightness. The companion only appeared as a tiny star.
Uwe Pilz Leipzig (Germany)	105mm (288x)
Uwe Pilz Leipzig (Germany)	105mm (288x)	viel schwieriger, als es die Daten vermuten lassen (7")
Mark McCarthy Fremont (California/USA)	178mm (205x)	Bright white A, B is a ghostly grey, faint but seen with direct vision, well separated. WDS is uncertain; there is a 38% parallax overlap, 1,188 AU weighted separation, and the stellar masses are high, 3.58 & 1.22 -- so it may well be gravitationally bound
Mark McCarthy Fremont (California/USA)	317mm (277x)	Bright white and faint ruddy B, fairly close ~4".

★★

alpha Lyr, 3 Lyr, Vega

H5 39

0^m.1

9^m.5

83.7"

184°

2017

Lyr

18^h36^m56.33^s / +38°47'01.20"

STFB9

0^m.1

11^m.0

76.0"

255°

2012

STFB9

0^m.1

9^m.5

86.6"

39°

2017

Jörg S. Schlimmer Germany	127mm (203x)	um Vega mehrere Beugungsringe sowie Speckles sichtbar, B leicht zu sehen, E nicht sichtbar
Jörg S. Schlimmer Germany	127mm (203x)	verschiedene Vergrößerungen zwischen 40 und 203 fach, Komponente E zeitweise bei indirektem Sehen sichtbar, da Himmel heute klarer ist

STT363

7^m.5

8^m.1

0.6"

336°

2018

Dra

18^h37^m23.92^s / +77°41'12.40"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

als 8 zu sehen

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/STT%20363.jpg

STF2372

6^m.5

7^m.7

25.0"

82°

2019

Lyr

18^h42^m08.09^s / +34°44'46.70"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x weit getrennt, bei 64x noch weiter getrennt :-D, Komponente B halb so hell wie A und deshalb gräulicher
Uwe Pilz Leipzig (Germany)	105mm (88x)	weiß und blaugrün, erkennbar bei 21x
Mark McCarthy Fremont (California/USA)	317mm (277x)	Yellow-green A and slightly blue-white B. 1 delta mag, very wide.

★★★

epsilon Lyr

STF2382, 4 Lyr, epsilon 1 Lyr

5^m.2

6^m.1

2.2"

345°

2020

Lyr

18^h44^m20.34^s / +39°40'12.40"

STFA37

AB-CD

4^m.7

4^m.6

209.5"

172°

2016

STFA37

5^m.2

10^m.1

149.5"

137°

2015

STF2383, 5 Lyr, epsilon 2 Lyr

5^m.2

5^m.4

2.4"

75°

2020

Christopher Hay Seeheim (Germany)	naked eye	STFA37 (AB-CD): While waiting for Comet Neowise at 3 in the morning in July 2020 surprised myself with my first naked-eye separation of Alpha1 und Alpha2 Capricornis (observing site at 50° northern latitude, Alpha1/2 passing through meridian). Encouraged by this, I lay down and had a close look at Epsilon Lyrae, without really expecting to be able to split it naked-eye, having never succeeded previously. At first Epsilon Lyrae appeared as a very short dash of light. Then the dash resolved into two pinpoints. After 15 years in the hobby and at age 60, at last got Eps Lyr split! No precise prior PA knowledge. After memorising PA as seen naked-eye carefully, confirmed it with binoculars. Eps Lyr is the third-easiest physical double in the (northern hemisphere) summer sky for the naked eye, after Zeta UMa (much easier) und Alpha Lib (marginally easier).
Christopher Hay Seeheim (Germany)	2x54	STFA37 (AB-CD): Clean split. Actually more pleasant than in 4x10 binoculars, presumably due to more steady handheld view.
Robert Zebahl Leipzig (Germany)	55mm (59x)	STF2382 (AB): At 42x slightly elongated, at 59x elongated and obviously notched.
Robert Zebahl Leipzig (Germany)	55mm (59x)	STF2383 (CD): At 42x clearly elongated, but without any visible notch. At 59x split with touching diffraction disks.
Robert Zebahl Leipzig (Germany)	70mm (57x)	STF2382 (AB): Obviously seen as figure '8'.
Robert Zebahl Leipzig (Germany)	70mm (57x)	STF2383 (CD): Split, but extremely tight with almost touching diffraction disks.
René Merting Drachhausen (Germany)	76mm (95x)	AB-CD: bei 29x schön getrennt erkennbar, ohne dass sich AB und CD schon trennen lassen AB: bei 57x leicht länglich mit kleiner Einschnürung - bei 95x schön eng getrennt, B nördlich wirkt etwas schwächer- bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen CD: bei 57x eine 8 - bei 95x ein schön eng getrenntes Pärchen gleichheller Sterne - bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen EF und I: bei 127x sind alle drei Sterne (I 10.1 mag / E 12.3 mag / F 12.7 mag) erkennbar
René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 64x ist das Sternpaar mit leichter Einschnürung und Nord-Süd-Ausdehnung erkennbar - beide Sterne stehen minimal enger zusammen als das südlichere Paar CD - bei 107x knappe Trennung, Komponente B nördlich ist mindestens eine halbe Größenklasse schwächer als A CD: bei 64x als 8 mit Ost-West-Ausdehnung erkennbar - bei 107x knapp getrennt, beide Komponenten sind etwa gleich hell
Sarah Gebauer Germany	100mm (136x)	ein Test mit dem neuen Refraktor, um einen Vergleich zum 6''-Newton zu ziehen: bei 136x schon astrein getrennt, natürlich ziemlich eng und ganz fein getrennt, aber dennoch ein überraschend positives Ergebnis
Robert Zebahl Leipzig (Germany)	102mm (125x)	Stunning view of the components A-D and I!
Uwe Pilz Leipzig (Germany)	105mm (26x)	bei 22x nicht trennbar
Jörg S. Schlimmer Germany	127mm (203x)	easy to split
Sarah Gebauer Germany	150mm (250x)	August 2019 zum ersten Mal die nah beieinanderstehenden Komponenten sauber getrennt, ein grandioser Doppel-Doppel-Anblick
Winfried Kräling Marburg (Germany)	152mm (175x)
René Merting Drachhausen (Germany)	320mm (144x)	bei 144x sind die Komponenten von AB und CD gerade so getrennt voneinander erkennbar, sie tanzen wie wild miteinander - mit Arperturmaske und Abblendung auf 120 mm zeigen die vier nun deutlich schwächeren Sterne schöne Beugungsscheibchen und sind besser getrennt voneinander sichtbar
Uwe Pilz Leipzig (Germany)	320mm (200x)	7 Komponenten!! A-B-C-D-E-F-I

Berthold Fuchs

Wiesbaden (Germany)

130mm

Double-Double

../projects/double-stars/berthold-fuchs/photographs/epsilon%20Lyrae.png

★★

STFA38, zeta Lyr, zeta 1/2 Lyr

4^m.3

5^m.6

43.7"

150°

2018

Lyr

18^h44^m46.36^s / +37°36'18.40"

Christopher Hay Seeheim (Germany)	7x45	Handheld. Clearly split, almost wide. Primary bluish-white. Fantastic 8.6° FOV together with Eps1/2 and Delta1/2 Lyrae. One of the best doubles for 7x.
Christopher Hay Seeheim (Germany)	10x42	Clearly separated. Colour contrast between bluish A and orangish D is there if one knows it, but not as striking as in 15x45 binoculars.
Christopher Hay Seeheim (Germany)	15x45	Component A clear blue-white, component D very pale tangerine orange. Wide split. Colour contrast seems even greater than that of nearby Delta 1/2 Lyrae. Physical double.
René Merting Drachhausen (Germany)	76mm (29x)	bei 29x ein schön getrenntes Pärchen - D im Südosten ist 1.5 Magnituden schwächer und wirkt blaugrau gegen die weißgelbe A-Komponente
Mark McCarthy Fremont (California/USA)	80mm (13x)	Zeta 2 Lyr. Slightly greenish-white stars. Best view in finder, cleaner. Wide, 1 delta mag.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x weit getrennt, Komponente A weißlich, D leicht gelblich
Sarah Gebauer Germany	100mm (80x)	ein typisches Augenpaar, der nördliche Stern leuchtet leicht heller als der südliche
Uwe Pilz Leipzig (Germany)	105mm (88x)	weiß-orange
Sarah Gebauer Germany	150mm (85x)	weit getrennt, unspektakulär
Winfried Kräling Marburg (Germany)	152mm (175x)
Mark McCarthy Fremont (California/USA)	152mm (175x)	Wide, white-yellow stars, one delta

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/Zeta%20Lyrae.jpg

★

STF2390

7^m.4

8^m.6

4.3"

155°

2016

Lyr

18^h45^m49.83^s / +34°31'06.60"

René Merting Drachhausen (Germany)	100mm (64x)	bei 64x ploppt Komponente B knapp getrennt auf, vorher war sie unsichtbar - Farben Fehlanzeige
Uwe Pilz Leipzig (Germany)	105mm (88x)
Mark McCarthy Fremont (California/USA)	317mm (277x)	Orange and very wide separation B, 2x fainter B, bluish.

★★

beta Lyr, 10 Lyr, Sheliak

STFA39

3^m.6

6^m.7

45.7"

149°

2017

Lyr

18^h50^m04.79^s / +33°21'45.60"

BU293

3^m.6

10^m.1

67.2"

317°

2015

BU293

3^m.6

10^m.6

86.0"

18°

2015

Christopher Hay Seeheim (Germany)	10x42	AB: Stabilised binoculars, handheld. B is well apart from A and distinct. Very pretty!
Robert Zebahl Leipzig (Germany)	70mm (22x)	At 22x and 57x the components A, B, E and F were easily seen. The B component appeared slightly bluish-silver at 22x, but at 57x the color was difficult to tell. All four components form a slightly curved 'Y' with the bright A component in the center.
René Merting Drachhausen (Germany)	76mm (18x)	AB: bei 18x sind die beiden Sterne gut getrennt voneinander zu erkennen EF: beide Komponenten zeigen sich bei 18x sehr schwach
René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x sind die Komponenten A und B weit getrennt, B ist deutlich schwächer EF: ebenfalls bei 32x machen zwei gleichhelle Fühlersterne (E und F) nördlich von Komponente A das System interessanter - sie sind noch schwächer als B - Farbe konnte ich bei keinem der vier Sterne erkennen
Sarah Gebauer Germany	100mm (80x)	AB: sehr heller und weit getrennter Doppelstern mit einem gefühlten Farbunterschied, der nördliche Stern wirkt warmweiß, der südliche leicht kühl-bläulich
Robert Zebahl Leipzig (Germany)	102mm (62x)	Components A, B, E and F are easily visible. The two southern stars on the drawing do not belong to the system.
Uwe Pilz Leipzig (Germany)	105mm (139x)	AB: Begleiter ist tiefrot; die Natur des Systems ist unsicher
Uwe Pilz Leipzig (Germany)	105mm (144x)	schon sichtbar bei 26x, aber schwierig. A blauweiß, B orange.
Jörg S. Schlimmer Germany	127mm (108x)	easy to split
Sarah Gebauer Germany	150mm (85x)	AB: weit getrennt, viele helle Feldsterne

★

STF2404

6^m.9

7^m.8

3.6"

180°

2020

Aql

18^h50^m45.55^s / +10°58'35.20"

Robert Zebahl Leipzig (Germany)	70mm (44x)	Already at 22x the double star is striking due to its orange color. At 44x split, but rather tight with a clear difference in brightness. At 100x the primary component appears in a bright orange, the secondary component shows a bluish tint.
René Merting Drachhausen (Germany)	76mm (57x)	bei 57x zeigt sich die B-Komponente extrem knapp getrennt südlich von A und ist knapp eine Größenklasse schwächer - A ist weiß, B grauweiß - bei 95x gefällt mir die Trennung besser
Mark McCarthy Fremont (California/USA)	203mm (667x)	Light orange and light blue, pretty.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	beide gelblich
Mark McCarthy Fremont (California/USA)	317mm (553x)	well split, yellow A and yellow-orange B.

★

BU137

8^m.7

9^m.0

1.3"

203°

2020

Lyr

18^h53^m57.56^s / +37°22'49.70"

Frederik Wanink Itterbeck (Germany)	254mm (640x)
Mark McCarthy Fremont (California/USA)	317mm (553x)	Fine near equal light orange, ~2". Rich finder field. In Steph 1 open cluster.
Mark McCarthy Fremont (California/USA)	508mm (667x)	Nice bright white near equal stars, 1.5", in a two plus one system with much fainter farther C. (AC 12th mag 23.6")

★

delta 2 Lyr, 12 Lyr, delta Lyrae Cluster, Stephenson 1

ES2028

4^m.3

11^m.2

86.3"

349°

2014

Lyr

18^h54^m30.29^s / +36°53'55.00"

SMR13

4^m.5

8^m.8

193.1"

210°

2014

SMR13

4^m.5

10^m.3

400.6"

238°

2014

SMR13

4^m.5

8^m.8

369.4"

245°

2014

SMR13

4^m.5

9^m.8

335.9"

261°

2014

SMR13

4^m.5

8^m.7

229.4"

284°

2014

SMR13

4^m.3

12^m.0

279.5"

249°

2014

SMR13

4^m.3

12^m.0

304.2"

236°

2014

ES2028

11^m.2

11^m.6

2.1"

135°

2008

SMR13

8^m.7

12^m.9

26.1"

251°

2015

Jörg S. Schlimmer Germany	305mm (94x)	easy to split
Mark McCarthy Fremont (California/USA)	508mm (205x)	ES2028 (BC): Delta 2 Lyr. ! Very cool. A is bright light orange, and BC are blue pinpoints, ~2" with a slight mag difference. Clearly and cleanly seen.

★★

STT525 & SHJ282

STT525

6^m.1

9^m.1

1.8"

130°

2015

Lyr

18^h54^m52.52^s / +33°58'06.90"

SHJ282

6^m.1

7^m.6

45.4"

350°

2018

SHJ282

6^m.1

11^m.0

214.8"

295°

2015

Christopher Hay Seeheim (Germany)	10x42	SHJ282 (AC): Stabilised binoculars, handheld. Wide split, the A component yellowish. Alias South 282. According to Stelledoppie a physical double.
Robert Zebahl Leipzig (Germany)	16x70	SHJ282 (AC): 2020-07-06: Easy, striking with reasonably apparent color contrast: yellowish to slightly orange & bluish.
Christopher Hay Seeheim (Germany)	60mm (15x)	SHJ282 (AC): Wide split. Blue colour of C component much more striking than the orange colour of the A component.
Robert Zebahl Leipzig (Germany)	70mm (22x)	SHJ282 (AC): Fairly bright and wide pair. The double star was conspicuous, especially in regard to its color: A appeared orange, C rather grey-bluish. It could be observed together with Messier 57 and beta & gamma Lyrae. Very nice.
René Merting Drachhausen (Germany)	76mm (18x)	SHJ282 (AC): bei 18x ist das Pärchen schon sehr auffällig - A ist hellgelb mit schönem Kontrast zur nördlich stehenden, gut getrennten B-Komponente - bei 57x präsentiert sich B in einem zarten stahlblau
Uwe Pilz Leipzig (Germany)	105mm (21x)	SHJ282 (AC): Orange und türkis
Uwe Pilz Leipzig (Germany)	105mm (180x)	STT525 (AB): gelbweiß-blau
Christopher Hay Seeheim (Germany)	125mm (23x)	SHJ282 (AC): Widely split, dominates the field of view, very attractive. A component is tangerine orange, C component ice blue. An echo of Albireo. A true physical pair.
Mark McCarthy Fremont (California/USA)	152mm (285x)	STT525 (AB): Suspected at 175x, best seen 285x. Orange A, subtle elongation to notched with best seeing, unequal. Wide SHJ 282 AC also seen. WDS uncertain but there is a -34% parallax overlap, so it's not possible to be
Mark McCarthy Fremont (California/USA)	178mm (205x)	STT525 (AB): Extremely fine point shows just outside bright white A's first diffraction, only with best seeing and when A is a perfect disk. WDS uncertain, however unfortunately there is -34% parallax overlap, it is not physical
Christopher Hay Seeheim (Germany)	180mm (200x)	SHJ282 (AC): A is very distant from C but the two are still a fine pair. Colour of C is more striking than that of A, in a manner similar to my simultaneous observation with 60mm at 15x, but not quite as pronounced. C has a companion set off from it by a hair of black. I estimate PA from C at approx. 80°, separation very roughly 2". Surprisingly can't find this companion in the double star catalogues.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	STT525 (AB): 3er System, sehr schwierig wegen Helligkeitsunterschied
Mark McCarthy Fremont (California/USA)	317mm (277x)	SHJ282 (AC): Wide separation orange and blue, 2 delta mag.

Frederik Wanink Itterbeck (Germany)	254mm	STT525 (AB)
Claus-Dieter Jahn Leipzig (Germany)		SHJ282 (AC): TS APQ 65/420mm, ZWO ASI 178mc, Livestack with Sharpcap, Exposure time: 1600x 0.6s

STF2421

8^m.1

9^m.3

24.6"

57°

2015

Lyr

18^h56^m01.68^s / +33°47'08.10"

René Merting Drachhausen (Germany)	76mm (57x)	bei 57x ein eher unauffälliges, ordentlich getrenntes Sternpaar - Komponente B im Nordwesten ist eine Magnitude schwächer
Uwe Pilz Leipzig (Germany)	105mm (88x)	orange und blaugrün
Uwe Pilz Leipzig (Germany)	105mm (137x)	recht weit, einfach

★

STF2417, theta Ser, 63 Ser, Alya

4^m.6

4^m.9

22.4"

106°

2019

Ser

18^h56^m13.18^s / +04°12'12.90"

4^m.6

6^m.8

421.0"

58°

2007

René Merting Drachhausen (Germany)	10x35	AB: wunderschön für diese Vergrößerung - zwei helle dicht beieinander stehende Sterne, knapp getrennt - die hellsten Sterne im Umfeld
René Merting Drachhausen (Germany)	10x50	AB: zwei helle schneeweiße Sterne, knapp getrennt - B im Osten ist nur knapp schwächer - ein schönes enges Pärchen
René Merting Drachhausen (Germany)	16x70	AB: ein gut getrennt zu sehendes Pärchen - beide Sterne stahlen weiß, Komponente B im Osten ist keine halbe Größenklasse schwächer
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x ein auffälliges gut getrenntes Sternpaar - Komponente B östlich ist nur leicht schwächer und strahlt ein wenig warm-weißer
Sarah Gebauer Germany	100mm (73x)	AB: die mit deutlichem Abstand bei 73x getrennten Doppelsterne liegen wie in einem U aus recht gleich hellen Sternen und bilden dabei im Süden den unteren Bereich des Buchstabens
Stefan Loibl Rosenheim (Germany)	102mm (102x)	AB: wide pair, hardly any difference in brightness, wonderful field, double stars looks like an embedded pair of eyes

Berthold Fuchs

Wiesbaden (Germany)

130mm

AB: easy DS

../projects/double-stars/berthold-fuchs/photographs/theta%20Ser.png

★★

STF2422

7^m.9

8^m.2

0.8"

68°

2018

Her

18^h57^m07.83^s / +26°05'45.10"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Excellent hairline split at 333x with eight inch. Near equal white stars. Picked them out in a crowded field, suspected elongation right away, split with seeing as I centered it in eyepiece, and from then it was a steady split
Frederik Wanink Itterbeck (Germany)	254mm (640x)	schwieriger wegen schwacher Sterne
Mark McCarthy Fremont (California/USA)	317mm (553x)	Very tight, <0.8", equal light orange, pretty faint.

STF2438

7^m.0

7^m.4

0.8"

357°

2019

Dra

18^h57^m28.47^s / +58°13'30.00"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	leicht; beide gleich hell
Mark McCarthy Fremont (California/USA)	508mm (333x)	Hairline split, white stars, near equal. 261.6 year period, look how fast it will move in the years 2150-2160!

STT369

7^m.8

7^m.9

0.7"

5°

2018

Dra

19^h07^m06.37^s / +72°04'26.60"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

zeitweilig gut erkennbar

../projects/double-stars/frederik-wanink/sketches/STT369.jpg

★

STF2470

7^m.0

8^m.4

13.8"

267°

2017

Lyr

19^h08^m45.20^s / +34°45'37.10"

Robert Zebahl Leipzig (Germany)	16x70	2020-07-06: Striking with well visible brightness difference. Very nice together with STF2474, which gives a similar view. A double-double for binoculars.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2474 unmittelbar 10' südlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2470 knapp schwächer als A-Komponente von STF2470
Robert Zebahl Leipzig (Germany)	102mm (40x)	Striking, especially with STF 2474 in one visual field. The color of the components was not clearly visible. Worthwhile! Sketch see STF 2474.
Sarah Gebauer Germany	150mm (85x)	nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen

★★

STF2474

6^m.8

7^m.9

16.0"

263°

2019

Lyr

19^h09^m04.35^s / +34°35'59.90"

Robert Zebahl Leipzig (Germany)	16x70	2020-07-06: Striking with well visible brightness difference. Very nice together with STF2470, which gives a similar view. A double-double for binoculars.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2470 unmittelbar 10' nördlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2474 knapp heller als A-Komponente von STF2470 - bei 64x Komponente A ein wenig gelblich
Robert Zebahl Leipzig (Germany)	102mm (40x)	Pretty conspicuous, easy double star. Especially attractive with the nearby double star STF 2470, as both are very similar in brightness, distance and position angle. The color of both components appeared slightly yellowish-orange.
Sarah Gebauer Germany	150mm (85x)	nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen
Christopher Hay Seeheim (Germany)	150mm (96x)	Widely separated. Component A yellowish, B light ice-blue. A true physical pair in 171 LY distance. Very attractive in field of view together with Struve 2470 about 10 arcseconds north. The components of each of the two Struves have almost the same position angles, similar separations and very similar delta-magnitudes. Struve 2470 is like an echo of 2474 but with no definite colour impression.

★

BU139 & STTA177, V338 Sge

BU139

7^m.1

8^m.0

0.6"

136°

2017

Sge

19^h12^m34.45^s / +16°50'47.20"

STTA177

7^m.1

8^m.0

98.4"

276°

2017

BU139

7^m.1

11^m.2

28.8"

101°

2015

BU139

8^m.0

11^m.2

138.9"

269°

2015

Mark McCarthy Fremont (California/USA)	80mm (13x)	STTA177 (AC): Near equal wide pair split in finder
Mark McCarthy Fremont (California/USA)	152mm (456x)	BU139 (AB): Very subtle notched unequal elongation at all powers. Physical with a 587-year period, currently coming of apastron, it will continue to tighten. Component of STT 177. Burnham discovered with his 6-inch in at 0.5", about what it is now, an astounding catch
Frederik Wanink Itterbeck (Germany)	254mm (640x)	BU139 (AB): getrennt, schwierig, 0,6"?
Mark McCarthy Fremont (California/USA)	317mm (553x)	STTA177 (AC): Very wide orange-yellow and blue, ~2-3 delta mag.

★

STT371

7^m.0

7^m.5

0.9"

161°

2018

Lyr

19^h15^m56.96^s / +27°27'21.40"

AB-C

7^m.0

9^m.8

47.2"

269°

2019

René Merting Drachhausen (Germany)	100mm (20x)	AB-C: bei 20x ist Komponente C im Westen schwach erkennbar in einem ordentlichen Abstand zu Komponente AB
Robert Zebahl Leipzig (Germany)	102mm (160x)	2021-08-20: At 28x the much fainter C component is clearly visible at quite a large separation. The tight pair AB showed up at 160x and 187x clearly elongated, partially as an '8'. A small difference in brightness could be guessed. Higher magnifications did not yield any gain. The air was only moderately steady (seeing 3/5).
Mark McCarthy Fremont (California/USA)	152mm (104x)	AB-C: Nice close 2 delta white stars. Not physical. Power too low to notice AB is 0.9" 7.05/7.55 and physical
Mark McCarthy Fremont (California/USA)	203mm (333x)	AB: Bright pair showed best masked down to 8-inches. Near equal, white stars, perfect!
Frederik Wanink Itterbeck (Germany)	254mm (640x)	AB: getrennt

STF2497

7^m.7

8^m.5

29.3"

356°

2019

Aql

19^h20^m01.09^s / +05°35'15.70"

René Merting Drachhausen (Germany)	10x50	ein wenig Geduld war notwendig, aber dann zeigte sich Komponente B leicht abgesetzt nördlich von A - geringer Helligkeitsunterschied
René Merting Drachhausen (Germany)	18x70	bei 18x ein ausgesprochen schickes Sternpaar - B zeigt sich nördlich von A gut getrennt, aber trotzdem noch eng seinem Partner stehend - Helligkeitsunterschied eine Dreiviertel Größenklasse - sonst gibt es kaum vergleichbare Sterne im Umfeld, so dass sich das Sternpaar schön prominent präsentieren kann
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x einfach trennbar, auffällig - das Sternpaar steht schön isoliert - B im Norden ist eine dreiviertel Größenklasse schwächer und grau, A dagegen ist strahlend weiß - zurück auf 20x ist der Doppelstern auch noch gut getrennt mit eingängigerem Farbkontrast
Sarah Gebauer Germany	100mm (45x)	auf der Suche nach dem PN NGC 6781 zufällig entdeckt, steht recht isoliert im 1,8° großen Gf. und ist bei 45x sehr deutlich getrennt, zwei feine Pünktchen beieinander

★★★

beta Cyg, 6 Cyg, Albireo, STFA43

3^m.2

4^m.7

34.7"

54°

2021

Cyg

19^h30^m43.29^s / +27°57'34.90"

Christopher Hay Seeheim (Germany)	7x42	Handheld binoculars in reclining chair. Following a surprisingly easy split of Zeta Lyr, I try out whether Albireo may also be splittable. Indeed, the pair is split, difficult but definite. Staring at Altair (Alpha Aql) for a few seconds with the binoculars prior to observing Albireo heigtens my acuity and makes the split more definite. Component A exhibits a mild orange-yellow hue.
Robert Zebahl Leipzig (Germany)	8x40	Well split, but I didn't recognised any color.
René Merting Drachhausen (Germany)	10x50	Komponente A ist gleißend hell und stroh-gelb, Komponente B ist deutlich schwächer leicht abgesetzt von A erkennbar und strahlt eigenartig mint-grün
Christopher Hay Seeheim (Germany)	12x36	Well split. A golden-red, B cold blue. Gorgeous!
Robert Zebahl Leipzig (Germany)	16x70	2020-07-06: Bright orange & white-bluish.
Robert Zebahl Leipzig (Germany)	80mm (25x)	One of the most beautiful double stars in the northern hemisphere. Differences in brightness and color (orange-blue) are brilliant! Even under urban conditions with small aperture an enjoyment!
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x stehen beide Sterne weit getrennt - Komponente A mit einem satten zitronen-gelb, Komponente B mit einem leichten Stich ins Blaue
Jörg S. Schlimmer Germany	127mm (203x)	easy to split
Sarah Gebauer Germany	150mm (116x)	Erstbeobachtung August 2019: deutlicher Farbunterschied zwischen blau und sattem Gelb zu sehen
Jörg S. Schlimmer Germany	305mm (170x)	alle Komponenten einfach zu trennen

Werner E. Celnik Rheinberg (Germany)	150mm
Werner E. Celnik Rheinberg (Germany)	150mm

★★★

HN 84, V340 Sge

6^m.4

9^m.5

28.4"

301°

2013

Sge

19^h39^m25.33^s / +16°34'16.00"

René Merting Drachhausen (Germany)	12x50	verdammt schwer - Komponente B ist ganz schwach nordwestlich von A auszumachen - beide Sterne berühren sich noch
René Merting Drachhausen (Germany)	16x70	beide Sterne präsentieren sich gut getrennt, nicht zu weit aber auch nicht zu nah - Komponente A meint es gut mit der Farbe gelb, bei Komponente B kann ich keine Farbe erkennen
Christopher Hay Seeheim (Germany)	80mm (30x)	Primary ruddy red, secondary wide apart but too faint for any colour impression. Straw-yellow Epsilon Saggitae half a degree to the west with its ice-blue eastern companion enhances the experience of colour contrast in the FOV and is actually more attractive than HN 84 with this aperture and power.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x sind beide Komponenten weit getrennt - Komponente A auffällig gelb-orange, B dagegen grau-blau, ein schöner Farbkontrast, der sich bei 32x verstärkt
Sarah Gebauer Germany	150mm (85x)	Holden 84, eine sehr goldgelbe Komponente und in 28'' Abstand die zweite, sehr schwache und weiße Komponente mit einem Hauch von Blau, sehr, sehr schön!
Christopher Hay Seeheim (Germany)	150mm (96x)	Main component ruddy tangerine orange, companion wide apart and ice blue. The longer I look the stronger the colour contrast becomes, which is by no means normal in many doubles. Epsilon Saggitae in same 0.8-degree field of view is straw-yellow with a cold blue companion (a field star?) pointing away from Epsilon in the direction of HN 84. I can’t think offhand of a better colour-contrast pair that can be framed in this manner in the same FOV.
Sarah Gebauer Germany	150mm (160x)	die hellere Hauptkomponente ist deutlich und stark goldfarben, die zweite dagegen sehr schwach, silbrig und dumpf
Mark McCarthy Fremont (California/USA)	178mm (205x)	Very pretty orange A and neon blue B, 1 delta mag, very wide

★★

STFA46, 16 Cyg

6^m.0

6^m.2

39.7"

133°

2020

Cyg

19^h41^m49.09^s / +50°31'31.60"

Christopher Hay Seeheim (Germany)	3x63	Self-built binoculars, hence the unusual specification. Made of top-quality teleconverters, apochromatic and sharp to the edge. With naked eye under good suburban sky 16 Cyg is just seen. In the 3x binoculars the double is split into two finest points of light in good moments despite the low magnification. A physical pair according to Stelledoppie. Two-star rating awarded because this is a true physical pair that can be split with the smallest binoculars and reveals increasingly more with growing binocular size (brightness disctinction between A and B in 7x50, colour distinction in 15x45).
Christopher Hay Seeheim (Germany)	7x50	Finely split, A-component appears very slightly brighter than B-component. A very pleasing binocular pair.
Christopher Hay Seeheim (Germany)	15x45	Wide split, very strong visual presence dominating 4.5° FOV. A-component very pale orange, B-component equally pale blue.
Robert Zebahl Leipzig (Germany)	16x70	2021-06-01: Very striking, bright at moderate separation and small difference in brightness. White-yellowish & white.
René Merting Drachhausen (Germany)	18x70	zwei ordentlich getrennte fast gleich helle Sterne - beide Komponenten sind reinweiß und die hellsten Sterne im unmittelbaren Umfeld - auffällig
Christopher Hay Seeheim (Germany)	44x100	Extremely strong pair in 1.9° FOV. Northern component marginally brighter and with slightest touch of yellow.
Sarah Gebauer Germany	100mm (80x)	der Doppelstern springt mich regelrecht an bei der Suche nach dem Blinking PN, es sind zwei ganz durchdringende, gleich helle Sternpunkte, die zwar schon einem sternreichen Umfeld stehen, aber dennoch deutlich heller hervortreten; südlich davon befindet sich rein optisch betrachtet eine abgeschwächte Kopie davon
Mark McCarthy Fremont (California/USA)	317mm (553x)	16 Cyg: Wide equal orange-yellow, also split in 80mm finder

KUI94

6^m.5

7^m.8

0.5"

158°

2014

Cyg

19^h41^m57.63^s / +40°15'14.60"

Frederik Wanink

Itterbeck (Germany)

254mm (640x)

unsicher, 8förmig

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/KUI%2094.jpg

STT383

7^m.0

8^m.3

0.8"

15°

2014

Cyg

19^h42^m56.26^s / +40°43'18.30"

7^m.0

11^m.6

45.2"

99°

2002

7^m.0

12^m.4

68.1"

43°

2002

Robert Zebahl Leipzig (Germany)	152mm (240x)	AB: 2022-08-07: Under these average conditions the double star is well visible as such. The fainter companion appears as a washed out star close to the primary component. In quiet moments the overlapping diffraction disks are well visible.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	AB: getrennt

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/STT%20383%20AB.jpg

STT384

7^m.6

8^m.2

1.0"

196°

2018

Cyg

19^h43^m47.09^s / +38°19'20.50"

7^m.6

9^m.8

59.4"

297°

2015

7^m.6

10^m.8

116.0"

294°

2015

René Merting Drachhausen (Germany)	100mm (20x)	AC: bei 20x weit getrenntes Pärchen - Komponente C ist deutlich schwächer als A
Frederik Wanink Itterbeck (Germany)	254mm (640x)	AB: deutliches Paar
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Nice near equal ~1", rest of field angular with stars (AB seen, AC and AD in the field.)

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/STT%20384%20AB.jpg

★

STF2579, delta Cyg, 18 Cyg

2^m.9

6^m.3

2.7"

213°

2020

Cyg

19^h44^m58.44^s / +45°07'50.50"

Robert Zebahl Leipzig (Germany)	70mm (200x)	2019-07-28: At 100x only indicated. At 200x the much fainter companion is visible as a slightly elongated brightening on the first diffraction ring.
Uwe Pilz Leipzig (Germany)	105mm (288x)	blauweiß
Robert Zebahl Leipzig (Germany)	152mm (133x)	2022-09-21: At 92x clearly separated, but still pretty tight. Primary component slightly yellowish with much fainter companion. At 133x easy to separate. The faint companion appears orange-brownish.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Very bright white with ruddy B, ~4", 4 delta mag. Nice!

17 Cyg

STF2580

5^m.1

9^m.2

25.9"

68°

2020

Cyg

19^h46^m25.60^s / +33°43'39.30"

STF2580

5^m.1

9^m.4

106.3"

122°

2020

WNO56

5^m.1

8^m.5

792.0"

235°

2002

STF2580

9^m.2

8^m.6

817.6"

236°

2010

STF2576

8^m.5

8^m.6

3.2"

155°

2020

René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x locker getrennt - Komponente A satt gelb, B wegen des großen Helligkeitsunterschiedes gräulich-bräunlich
Uwe Pilz Leipzig (Germany)	120mm (140x)
Robert Zebahl Leipzig (Germany)	152mm (92x)	2021-07-24: At 30x the components A, B & C are easily visible, whereby A & B are still quite close together. The bright component A appears in a pale yellow. At 92x also the pair FG is separated easily and looks less belonging to the system because of the wide separation to the other components. All in all it is worth observing.
Winfried Kräling Marburg (Germany)	152mm (175x)	A, B & C
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: 17 Cyg: Yellow and slightly red, well separated, 1 delta mag. (This is an amazingly complex system with 11 stars in all sorts of combinations. Why not just call it an open cluster?)

STT386

8^m.5

8^m.6

1.0"

71°

2018

Cyg

19^h48^m16.51^s / +37°09'37.50"

Robert Zebahl Leipzig (Germany)	152mm (270x)	Clearly visible as a double star with touching diffraction disks. Not difficult.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	trotz schwacher Komp. gut zu sehen
Mark McCarthy Fremont (California/USA)	317mm (553x)	Tight near equal, nice, split with seeing, ~1"

★★

STF2583, 52 Aql, pi Aql

6^m.3

6^m.8

1.4"

105°

2019

Aql

19^h48^m42.05^s / +11°48'57.30"

Robert Zebahl Leipzig (Germany)	102mm (160x)	2022-09-23: Small difference in brightness visible. From time to time the double star appeared just separated with a fine gap, but at least visible as a distinct '8'.
Stefan Loibl Rosenheim (Germany)	102mm (205x)	not fully split, seen as constricted '8'
Robert Zebahl Leipzig (Germany)	120mm (337x)	At 100x elongated, at 200x seen as '8'. At 337x split in moments of good seeing, but still very tight. Overall the seeing was not so good.
Sarah Gebauer Germany	150mm (160x)	wieder ganz haarscharf getrennt, bildet ein großes, nettes Dreieck mit Feldsternen, gefällt mir wieder sehr gut!
Sarah Gebauer Germany	150mm (170x)	bei 170x ganz, ganz knapp getrennt, ein haarfeiner, schwarzer Trennstrich ist zu sehen, eine geniale Grenzbeobachtung!
Robert Zebahl Leipzig (Germany)	152mm (133x)	2022-09-22: Very finely separated pair of nearly equally bright components.
Mark McCarthy Fremont (California/USA)	152mm (285x)	Pi Aql. Very pretty near equal light blue stars, cleanly separated
Mark McCarthy Fremont (California/USA)	203mm (205x)	Pi Aql. Pretty yellow-orange A and a little more than 1 delta mag pale blue B, ~1", yet neatly separated
Frederik Wanink Itterbeck (Germany)	254mm (640x)	Helligkeitsunterschied erkennbar

★

STT387

7^m.1

7^m.9

0.5"

94°

2020

Cyg

19^h48^m43.81^s / +35°18'41.30"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	zeitweise als 8 zu sehen
Mark McCarthy Fremont (California/USA)	317mm (277x)	Red, very close pair? Seeing not supporting higher magnification. Marginal.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Overlapping disks, to a nearly hairline split with seeing. Half delta mag.

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/STT%20387.jpg

★

DJU4, 13 Vul

4^m.6

7^m.4

1.5"

248°

2020

Vul

19^h53^m27.69^s / +24°04'46.60"

Mark McCarthy Fremont (California/USA)	152mm (285x)	Gorgeous! Bright A and 3 delta mag B appears as a fine point just beyond A's diffraction. Seen at 175x, best at 285x. Physical with a 615-year period, at apastron
Frederik Wanink Itterbeck (Germany)	254mm (640x)	schwierig wegen Helligkeitsunterschied

STF2594, 57 Aql

5^m.7

6^m.3

36.3"

171°

2019

Aql

19^h54^m37.65^s / -08°13'38.30"

René Merting Drachhausen (Germany)	10x50	ein einfacher Doppelstern - schön getrennt - Komponente A strahlt etwas weißer (ich weiß, es gibt keine Steigerungsformen von Farben)
René Merting Drachhausen (Germany)	16x70	ein ansehnliches gut getrenntes Sternpaar - Komponente B im Süden ist gut eine halbe Größenklasse schwächer - das Weiß von Komponente A wirkt etwas kühler, während B eher in einem wärmeren zarten creme-gelb strahlt
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein sehr auffälliges, komfortabel getrenntes Sternpaar - Komponente B im Süden ist eine halbe Magnitude schwächer - zurück auf 20x immernoch eine ordentliche Trennung, B wirkt jetzt etwas schmutziger weiß
Uwe Pilz Leipzig (Germany)	105mm (22x)	orange-blau
Uwe Pilz Leipzig (Germany)	320mm (36x)

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/57%20Aquliae.png

★

STF2605, psi Cyg, 24 Cyg

5^m.0

7^m.5

2.9"

175°

2017

Cyg

19^h55^m37.82^s / +52°26'20.50"

Robert Zebahl Leipzig (Germany)	70mm (100x)	At 80x difficult. At 100x and 133x the fainter component was clearly visible as small, roundish, partly slightly oval brightening.
René Merting Drachhausen (Germany)	100mm (107x)	bei 107x knapp getrennt, A strahlt weiß mit einer schwachen Andeutung von gelb, B im Süden ist deutlich schwächer
Uwe Pilz Leipzig (Germany)	105mm (96x)	nicht schwierig
Uwe Pilz Leipzig (Germany)	105mm (144x)
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow and ruddy, fairly wide, ~4" 2 delta mag.

BU1475 & HDO155

BU1475

7^m.8

9^m.5

10.4"

113°

2015

Aql

19^h57^m53.70^s / -09°03'30.30"

HDO155

7^m.8

8^m.7

115.1"

119°

2015

BU1475

8^m.7

11^m.1

4.9"

163°

2015

René Merting Drachhausen (Germany)	15x56	HDO155 (AC): ein weit auseinander stehendes Pärchen - Komponente B im Südosten ist halb so hell wie A
René Merting Drachhausen (Germany)	76mm (29x)	BU1475 (AB): bereits bei 29x ist B knapp abgesetzt südöstlich von A erkennbar - A ist schön weiß und B ist im Grunde so schwach (gut 1.5 mag schwächer), dass der Stern kupferbraun strahlt
Uwe Pilz Leipzig (Germany)	320mm (121x)

★★

STF2606

7^m.7

8^m.4

0.7"

147°

2018

Cyg

19^h58^m32.66^s / +33°16'38.80"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	sehr schwierig, Luftunruhe
Mark McCarthy Fremont (California/USA)	317mm (553x)	Hair split to clean split when seeing stills and there is only an airy disk. Near equal, half a delta mag. ~0.8"
Mark McCarthy Fremont (California/USA)	508mm (333x)	Close pair 2 delta mag.

STT395, 16 Vul

5^m.8

6^m.2

0.7"

129°

2020

Vul

20^h02^m01.45^s / +24°56'16.80"

Mark McCarthy Fremont (California/USA)	152mm (456x)	Slightly unequal snowman at all powers. Notching increases in strength with increasing power. Physical with 1201-year period
Mark McCarthy Fremont (California/USA)	203mm (667x)	16 Vul. Hairline split at 8" 333x. At 667x I see a more definite split. It appears only half delta mag, rather than the 1 delta mag in Sky Tools. Nice star.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	fast getrennt, eher 8, ähnlich hell

Frederik Wanink

Itterbeck (Germany)

254mm

../projects/double-stars/frederik-wanink/photographs/16%20Vul.jpg

★★

SHJ314, V1676 Cyg

6^m.8

9^m.5

11.3"

300°

2019

Cyg

20^h05^m57.32^s / +35°47'18.20"

6^m.8

7^m.3

36.3"

28°

2019

René Merting Drachhausen (Germany)	100mm (32x)	AD: bei 32x ist westlich von A knapp getrennt ein sehr schwacher Lichtpunkt erkennbar - mindestens 3 Größenklassen Helligkeitsunterschied zwischen A und D - zurück auf 20x sind beide Sterne auch noch ganz knapp getrennt erkennbar AF: bei 32x sind zwei weit auseinander stehende Sterne erkennbar, Komponente F im NO ist nur unwesentlich schwächer und strahlt nicht ganz so klar wie A
Uwe Pilz Leipzig (Germany)	105mm (144x)	liegt gemeinsam mit SHJ 315 im OC NGC 6871. Die Zeichnung des gesamten Haufens enthält nur die hellsten Sterne.

STF2644

6^m.9

7^m.1

2.6"

206°

2019

Aql

20^h12^m35.09^s / +00°52'00.20"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Very tight at 57x, but separable without noticeable difference in brightness. At 100x very small difference in brightness visible. The colors of both components appeared to be the same, but not clearly perceptible.
Stefan Loibl Rosenheim (Germany)	102mm (102x)	both components white at 102x, companion appears slightly reddish at 205x
Mark McCarthy Fremont (California/USA)	203mm (333x)	Close white stars, near equal, ~2.5"
Frederik Wanink Itterbeck (Germany)	254mm (640x)	gleich hell, leicht
René Merting Drachhausen (Germany)	320mm (144x)	bei 144x sehe ich eine Ameise, die in ruhigen Momenten knapp getrennt erscheint - beide Sterne sind in etwa gleich hell, die schwächere Komponente steht im Südwesten

★★★

STFA50, 30/31 Cyg, omicron Cyg

3^m.9

7^m.0

108.6"

173°

2016

Cyg

20^h13^m37.90^s / +46°44'28.80"

3^m.9

4^m.8

336.7"

322°

2016

Robert Zebahl Leipzig (Germany)	naked eye	AD: Well split with noticeable difference in brightness.
Christopher Hay Seeheim (Germany)	3x63	AD: Self-built binoculars, hence the unusual specification. Widely split, A (31 Cyg) light orange, D (30 Cyg) light blue.
Christopher Hay Seeheim (Germany)	7x50	A-D: Widely split, A (31 Cyg) luminous orange-red, D (30 Cyg) luminous ice-blue. C set off from A as a fine speck of light.
Robert Zebahl Leipzig (Germany)	8x40	AC: Observation at full moon. Easily split with big difference in brightness. Brighter component slightly orange. C component rather faint.
Robert Zebahl Leipzig (Germany)	8x40	AD: Wonderful double star for binoculars. Large distance of the components, brighter once (31 Cyg) appeared slightly orange, the fainter (Cyg 30) more bluish.
Christopher Hay Seeheim (Germany)	15x45	A-D: Very wide apart but still perceived as belonging together. A (31 Cyg) orange-red, D (30 Cyg) ice-blue. C well set off from A and light ice-blue, like an echo of D. A delightful group of three for binoculars at this power, further accentuated by nearby orange Omicron2 Cygni. Both the brightnesses and colour hues of Omi1A and Omi2 appear practically identical.
Robert Zebahl Leipzig (Germany)	16x70	2020-07-03: Fantastic sight. A: bright orange, D: white-bluish, C: light blue. Very beautiful field.
René Merting Drachhausen (Germany)	18x70	wunderschön - Komponente A präsentiert sich buttergelb - die südliche, schwächste Komponente C zeigt sich aquamarinblau - D im Norden ist reinweiß und steht dreimal weitere entfernt wie AC
René Merting Drachhausen (Germany)	76mm (57x)
Robert Zebahl Leipzig (Germany)	80mm (25x)	AC: Similar to the observation with binoculars. C component appeared bluish and gave good contrast to the orange colored 31 Cyg.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x sind alle drei Sterne weit getrennt und doch irgendwie zusammengehörend, Komponente A ist rapsgelb und am auffälligsten, Komponente D strahlt weiß und die schwächste Komponente C schimmert bläulich, schöner Anblick
Robert Zebahl Leipzig (Germany)	102mm (28x)	Bright, wide apart and wonderful contrast in color. A: light yellowish-orange, C: blue, D: light blue.
Sarah Gebauer Germany	150mm (30x)	die drei Komponenten plus Omicron2 bilden ein wunderschönes, sehr langes und spitzes Dreieck und zeigen dabei wundervolle Farben, Komponente A von o1 sowie o2 erscheinen schön gelblich, Komponente D von o1 hat einen deutlichen Blaustich im Weißen, wirklich ein sehr schönes Gesamtbild - auf Komponente C hatte ich nicht geachtet
Sarah Gebauer Germany	150mm (85x)	dieses Mal nur die drei dicht beieinanderstehenden Komponenten A, C und D im Sichtfeld gehabt, Komponente A ist wieder deutlich gelbgold, C wirkt leicht bläulich und Komponente D wirkt dieses Mal eher weiß

STF2658

7^m.2

9^m.4

5.2"

106°

2020

Cyg

20^h13^m40.74^s / +53°07'30.30"

René Merting Drachhausen (Germany)	100mm (107x)	bei 107x ist Komponente B schwach erkennbar östlich von A, es ist schon ordentlich Luft zwischen den beiden - Helligkeitsunterschied 2 Magnituden
Uwe Pilz Leipzig (Germany)	105mm (144x)	orangegelb
Uwe Pilz Leipzig (Germany)	320mm (225x)

★

STT403 & STF2657

STT403

7^m.3

7^m.6

0.9"

171°

2019

Cyg

20^h14^m21.53^s / +42°06'15.60"

STF2657

7^m.3

9^m.8

11.6"

32°

2015

René Merting Drachhausen (Germany)	100mm (64x)	STF2657 (AC): bei 64x zeigt sich C ganz schwach nordöstlich von A - mindestens 2 Größenklassen Helligkeitsunterschied - A ist reinweiß, bei C bin ich froh, dass ich C überhaupt erkennen kann
Uwe Pilz Leipzig (Germany)	105mm (288x)	STT403 (AB): schwierig
Mark McCarthy Fremont (California/USA)	152mm (175x)	STT403 (AB): Near equal hairline split, white, 2 delta mag. Fainter C (STF 2657 AC) well split nearby. WDS uncertain but there is 26% parallax range overlap, 372 AU weighted separation, and high 3.54/3.29 solar mass, so very likely gravitational
Robert Zebahl Leipzig (Germany)	152mm (270x)	STT403 (AB): At 129x clearly elongated, notched. At 270x clearly split, but very tight with almost touching diffraction disks. Visible, but very small difference in brightness. Inconspicuous color.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	STT403 (AB): schwaches 3er System, getrennt
Mark McCarthy Fremont (California/USA)	317mm (553x)	STT403 (AB): Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)
Mark McCarthy Fremont (California/USA)	317mm (553x)	STT403 (AB): Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)

Frederik Wanink

Itterbeck (Germany)

254mm

STT403 (AB)

../projects/double-stars/frederik-wanink/photographs/STT%20403%20AB.jpg

STT404

7^m.6

9^m.8

28.5"

115°

2015

Cyg

20^h15^m49.33^s / +52°30'08.20"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein weit getrenntes Pärchen - Komponente B ist schwach als grauer Punkt erkennbar, A nordwestlich davon ist leicht gelblich - zurück auf 20x hat A weiterhin einen Farbstich und B sieht aus wie ein Nadelstich, das Paar ist gut getrennt
Uwe Pilz Leipzig (Germany)	320mm (45x)

STF2671

6^m.0

7^m.5

3.7"

337°

2017

Cyg

20^h18^m24.76^s / +55°23'49.80"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Pretty tight with a clear difference in brightness. I couldn't see anything conspicuous regarding colors.
Mark McCarthy Fremont (California/USA)	152mm (175x)	Cream white A and light yellow, 1 delta mag B, well separated. WDS uncertain, however there is 12% parallax overlap, 337 AU weighted separation, good 2.32/1.74 solar mass, so it likely is gravitationally bound
Uwe Pilz Leipzig (Germany)	320mm (225x)

STF2664

8^m.1

8^m.3

27.8"

322°

2019

Del

20^h19^m38.48^s / +13°00'17.20"

René Merting Drachhausen (Germany)	10x50	zwei gleich helle Sterne in Südost-Nordwest-Ausrichtung - Trennung eindeutig, aber sehr knapp
Robert Zebahl Leipzig (Germany)	16x70	2020-08-19: Well separated with a clear, but not too wide separation. Slightly different in color, with the southern component appearing slightly cooler. Beautiful surrounding field.
Robert Zebahl Leipzig (Germany)	16x70	2021-09-02: Quite conspicuous as a double star, moderately bright with very little difference in brightness. Slightly orange & white-bluish.
Uwe Pilz Leipzig (Germany)	16x70
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x sehr weit getrennt - trotz der großen Trennung auffällig, da kaum weitere Sterne im unmittelbaren Umfeld stehen - Komponente B im NW ist nicht viel schwächer als A - zurück auf 20x ist der Abstand zwischen beiden Sternen immer noch sehr groß
Mark McCarthy Fremont (California/USA)	152mm (285x)	Wide, white, slight magnitude difference
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist einfach zu trennen, mit sehr leichtem Helligkeitsunterschied. Komponente A leuchtet leicht gelblich und Komponente B geht ins bläuliche.

★★★

BLL49, U Cyg

8^m.0

9^m.0

65.4"

231°

2015

Cyg

20^h19^m41.66^s / +47°54'19.90"

Robert Zebahl Leipzig (Germany)	16x70	2020-07-03: Easy split with very good color contrast: white and clear orange.
Robert Zebahl Leipzig (Germany)	102mm (28x)	2019-08-22: While the primary component appears quite unspectacular in a white, the companion U Cygni is much more interesting. It is a carbon star whose brightness varies between 5m9 and 12m1 with a period of about 463 days. It appears in mostly intensely orange, and even deep red in the towards its minimum. Extremely rewarding!

★★

STF2681

8^m.0

10^m.6

6.8"

39°

2015

Cyg

20^h22^m49.54^s / +53°25'02.80"

8^m.0

8^m.9

38.2"

199°

2015

8^m.0

11^m.8

42.0"

166°

2015

8^m.9

11^m.8

23.3"

101°

2015

René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 32x gut getrenntes Pärchen, Komponente A nördlich strahlt doppelt so hell wie B im Süden, auf C nicht geachtet
Uwe Pilz Leipzig (Germany)	105mm (144x)	Auf den ersten Blick sah ich nur A und C, aber D war auch kein Problem. B war nur blickweise zu erkennen.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Nice. 3x fainter B, ~4", another wide pair below. (4 stars in system.)
Uwe Pilz Leipzig (Germany)	320mm (225x)

STF2679

7^m.9

9^m.7

24.7"

77°

2019

Del

20^h24^m22.59^s / +19°34'30.00"

7^m.9

11^m.6

38.6"

150°

2017

Robert Zebahl Leipzig (Germany)	16x70	AB: 2021-09-02: Easy to separate with still moderate separation and rather large difference in brightness. Located in a star rich field.
Uwe Pilz Leipzig (Germany)	16x70	AB: Sichtung unsicher
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 32x ist Komponente B im Osten von A relativ weit getrennt erkennbar - Komponente B ist sehr schwach und gut 1.5 Magnituden schwächer als A - zurück auf 20x ist B nur noch ganz knapp erkennbar, aber weiterhin mit ordentlichem Abstand zu A
Karsten Kopp Köln (Germany)	600mm (180x)	AB: Doppelstern ist einfach zu trennen und auch der Helligkeitsunterschied von gut 2,0 mag ist sehr auffällig. AC: Sehr einfacher, hier ist die Komponente C mit nur 11,6 mag die Herausforderung. A leuchtet gelblich

FRK9

8^m.4

9^m.0

59.8"

238°

2015

Cyg

20^h26^m21.52^s / +54°01'32.60"

Uwe Pilz

Leipzig (Germany)

320mm (45x)

../projects/double-stars/uwe-pilz/sketches/211109frk9.jpg

STF2693

8^m.2

9^m.2

13.7"

12°

2016

Cyg

20^h28^m24.22^s / +54°30'05.40"

Uwe Pilz

Leipzig (Germany)

320mm (45x)

../projects/double-stars/uwe-pilz/sketches/211109sttf2693.jpg

★★

WEI35

8^m.3

8^m.8

4.2"

214°

2020

Cyg

20^h29^m13.54^s / +37°30'45.80"

8^m.3

9^m.4

87.6"

100°

2015

9^m.4

10^m.6

12.1"

202°

2018

René Merting Drachhausen (Germany)	100mm (64x)	AB: bei 64x ist ein schön eng stehendes Paar zweier schwacher Sterne erkennbar - Komponente B im SW schwächelt helligkeitstechnisch nur um eine halbe Magnitude gegenüber A - Komponente A wirkt leicht farbig, das aber ist nicht greifbar
Uwe Pilz Leipzig (Germany)	105mm (200x)	eine anderer doppelter Doppelstern! Lohnend! Es ist erstaunlich, dass er nicht in den klassischen Katalogen auftaucht
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Double-double! Near equal 3", and closeby a wider pair, 5", 1 delta mag. (AB is first, CD might be second? 4 stars visible in system)

STF2691

8^m.1

8^m.4

16.3"

32°

2019

Cyg

20^h29^m43.18^s / +38°07'31.50"

Robert Zebahl Leipzig (Germany)	16x70	2020-08-19: Nicely separated and in one field of view together with 40 Cygni and Messier 29. Moderate distance and brightness difference, relatively conspicuous even though the environment is rather rich in stars.
René Merting Drachhausen (Germany)	18x70	das Paar ist genau richtig für 18-fache Vergrößerung - ein schön isoliert stehendes, knapp getrenntes Sterndoppel zweier gleichheller Protagonisten - Komponente B im NO ist nur unwesentlich schwächer
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-07-29: At 22x clearly separated with little difference in brightness. Colorwise the components appeared different: yellowish-orange & bluish. The color impression was a bit more intensive at 44x: slightly orange & bluish.
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x ein schönes knapp getrenntes Pärchen aus zwei schwächeren Sternen - Komponente A im Süden ist nur unwesentlich heller als B - bei 32x leichter Farbkontrast, weil A warm-weiß strahlt
Uwe Pilz Leipzig (Germany)	105mm (53x)	schon bei 22x auffallend

★

BU63, 1 Del

6^m.2

8^m.0

0.9"

347°

2016

Del

20^h30^m17.95^s / +10°53'45.30"

Sarah Gebauer Germany	100mm (136x)	auch bei 136x nicht zu trennen, bei 0,9'' Distanz und Amiciprisma aber auch kein Wunder
Frederik Wanink Itterbeck (Germany)	254mm (640x)	schwierig
Mark McCarthy Fremont (California/USA)	317mm (553x)	1 Delphini: 1 disk split to the NNW when seeing stills. A tough observation. 1 Del is a fascinating star that spins once in 0.9 earth days! See http://stars.astro.illinois.edu/sow/1del.html.
Mark McCarthy Fremont (California/USA)	508mm (533x)	1 Del. B seen within A's diffraction at 533x and apodising mask, <1", ~2 delta

★

STF2690 & HJ269 & DA1

STF2690

A-BC

7^m.1

7^m.4

17.8"

255°

2020

Del

20^h31^m11.94^s / +11°15'33.70"

HJ269

7^m.1

12^m.1

23.0"

108°

2016

DA1

7^m.9

8^m.0

0.3"

184°

2016

René Merting Drachhausen (Germany)	10x50	STF2690 (A-BC): ein ganz enges Sternpaar mit zwei gleich hellen Sternen - ich würde beide als 8 mit tiefer Einschnürung bezeichnen, also kurz vor der Trennung
Robert Zebahl Leipzig (Germany)	12x42	STF2690 (A-BC): 2021-10-09: Very nice. Clearly separated with almost equally bright components.
René Merting Drachhausen (Germany)	12x42	STF2690 (A-BC): ein superenges, schönes Paar gleich heller Sterne - da passen maximal eineinhalb Blatt Papier zwischen - schön im Zusammenspiel mit den beiden hellen Sternen südöstlich und südwestlich
Robert Zebahl Leipzig (Germany)	16x70	STF2690 (A-BC): 2020-08-19: Striking, moderately bright with nice separation of the similarly bright components in nice environment. The eastern component seemed slightly brighter and colorwise cooler.
Uwe Pilz Leipzig (Germany)	16x70	STF2690 (A-BC)
Uwe Pilz Leipzig (Germany)	16x70	STF2690 (A-BC): etwa gleichhell, sauber getrennt
René Merting Drachhausen (Germany)	100mm (20x)	STF2690 (A-BC): bei 32x ein schön getrenntes Sternpaar mit leichtem Farbkontrast - Komponente A im Osten ist weiß, BC im Westen ist leicht gelblich und dumpfer, aber kaum ein Helligkeitsunterschied zwischen beiden Sternen - zurück auf 20x ist das Paar noch schöner anzusehen, weil beide Sterne dichter zusammen stehen
Sarah Gebauer Germany	100mm (49x)	STF2690 (A-BC): weit getrennt, zwei simple Glupschäuglein im Leeren, mehr nicht
Robert Zebahl Leipzig (Germany)	102mm (28x)	STF2690 (A-BC): 2021-09-11: Very attractive, almost equally bright with subtle color contrast: pale yellow-orange & white-bluish.
Robert Zebahl Leipzig (Germany)	152mm (30x)	STF2690 (A-BC): 2021-09-08: Striking in nice star environment, easy to separate with little difference in brightness. Both components appeared slightly yellowish.
Mark McCarthy Fremont (California/USA)	317mm (277x)	STF2690 (A-BC): Widely separated near equal white stars.
Mark McCarthy Fremont (California/USA)	508mm (533x)	DA1 (BC): This is part of STF 2690 A-BC, which is a white, wide, near equal, pair (7.12/7.39 17.7") observed with 8-inch at 205x. I suspected BC at 8-inch 333x, & had overlapping disks with 8-inch 533x. With 20-inch 533x I see a hairline split, slight magnitude difference. Seeing is not supporting it well, but it's clear. Very nice. Dawes discovered in 1840 at 0.7" -- DA 1 was discovered when Dawes was working at "Mr Bishop's observatory" in London, from 1839 to 1844. It had a 7-inch refractor by Dollond (1836) who had made both mounting and telescope. So at current 0.369" it's not surprising I only had overlapping disks at 8-inch. It's a physical pair, with a 236.52 year period, and will widen another 0.1" in the next 15 years
Karsten Kopp Köln (Germany)	600mm (180x)	STF2690 (A-BC): STF 2690: Gut zu trennender Doppelstern mit leichtem Helligkeitsunterschied. Komponente A leuchtet weiß und die Komponente B geht ins gelbliche.

★★

STF2703

8^m.3

8^m.4

25.1"

290°

2019

Del

20^h36^m49.41^s / +14°43'42.40"

8^m.3

8^m.8

77.8"

234°

2016

8^m.3

12^m.8

84.7"

347°

2016

8^m.4

8^m.8

67.0"

215°

2016

René Merting Drachhausen (Germany)	12x42	AB: flüchtig betrachtet erst übersehen (C im Südwesten hat etwas abgelenkt), aber bei genauem Hinschauen ist zu erkennen, dass die nordöstliche Komponente aus zwei gleich hellen Sternen besteht AC: die südwestliche Komponente hat dreifachen Abstand wie AB
Robert Zebahl Leipzig (Germany)	16x70	2020-08-19: Immediately eye-catching multiple star located between beta and zeta Delphini. Components A, B & C are very easily seen as a triple system forming a striking triangle. A very slight difference in brightness between A & B is perceptible, as well as a color difference, though I cannot name any colors. Very nice.
Uwe Pilz Leipzig (Germany)	16x70	AB
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x einfach - Komponente B im Westen ist nur minimal schwächer BC: bei 20x ist Komponente C südwestlich von B in mehr als dem doppeltem Abstand von A zu B erkennbar, Helligkeitsunterschied gut eine halbe Größenklasse
Uwe Pilz Leipzig (Germany)	105mm (144x)	AB
Karsten Kopp Köln (Germany)	600mm (180x)	Sehr schönes Mehrfachsternsystem. AB mit fast identische Helligkeit, wobei Komponente C mit 0,5 mag etwas schwächer ist. Ansonsten sind AB,AC und BC als auffälliges Dreieck leicht zu trennen. AD: Hier ist die Komponente D eine sehr große Herausforderung, die ich nur mit indirektem aus der Stadt heraus sichten konnte.

Karsten Kopp

Köln (Germany)

140mm

Image taken with TEC 140, Canon 700Da, 4 seconds exposure time

../projects/double-stars/karsten-kopp/photographs/STF2703%20-%2027.10.2021.jpg

STT410

6^m.7

6^m.8

0.9"

3°

2018

Cyg

20^h39^m33.31^s / +40°34'46.80"

AB-C

6^m.8

8^m.7

68.6"

70°

2018

AB-D

6^m.8

10^m.0

106.6"

327°

2018

Uwe Pilz Leipzig (Germany)	105mm (198x)	AB: nur mäßig schwierig, Abstand 0“87
Uwe Pilz Leipzig (Germany)	105mm (288x)	AB: nicht getrennt
Robert Zebahl Leipzig (Germany)	152mm (240x)	AB: 2022-08-07: Two clearly visible diffraction disks that slightly touch each other. In a few moments a hint of separation is possible. A very slight difference in brightness can be seen at times.
Mark McCarthy Fremont (California/USA)	152mm (245x)	AB: Near equal, hairline split at best moments at 175x, good split at 245x. Blue-white stars with perfect airy disks! Physical with 1152-year period, is is nearing periastron and will make a relatively quick turn around the primary in the coming decades
Robert Zebahl Leipzig (Germany)	152mm (270x)	All four components easily visible. The pair AB shows two clear, equally bright, overlapping diffraction disks.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	AB: gleich hell, getrennt

★

STF2718

8^m.3

8^m.4

8.5"

87°

2020

Del

20^h42^m33.47^s / +12°43'41.90"

8^m.3

9^m.0

167.2"

346°

2015

8^m.4

9^m.0

167.3"

346°

2015

Robert Zebahl Leipzig (Germany)	16x70	AB: 2021-09-02: Appears elongated at first glance, on closer observation just separable. A very small difference in brightness is visible. The double star is located in a beautiful surrounding field of stars.
René Merting Drachhausen (Germany)	100mm (32x)	AB: der Doppelstern steht sehenswert in einem Bogen aus 5 Sternen - bei 32x werden zwei gleich helle knapp getrennte Sterne sichtbar - schwer zu sagen, welches die A-Komponente ist - die westliche Komponente wirkt im Weiß-Farbton etwas kühler
Sarah Gebauer Germany	100mm (80x)	AB: wie der oberste Stern in einer Wiege, nordwestlich dieser Wiege ist noch eine weitere geschwungene Sternlinie zu sehen, sehr schön
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: Easy wide, white, near equal Psychical
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Same brightness white pair.
Karsten Kopp Köln (Germany)	600mm (180x)	AB: Doppelstern ist sehr einfach zu trennen mit gleicher Helligkeit. Beide Komponenten erstrahlen weißlich.

★★

STF2725

7^m.5

8^m.2

6.2"

12°

2019

Del

20^h46^m13.31^s / +15°54'26.40"

Robert Zebahl Leipzig (Germany)	16x70	2021-09-02: The double star appears clearly elongated at the correct position angle, but nothing more.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein schöner Kontrast zum 15' nördlich stehenden viel helleren Sternpaar STF2727 - hier bei dem wesentlich schwächeren Sternpaar zeigt sich bei 32x die Komponente B knapp getrennt nördlich von A - Helligkeitsunterschied etwas mehr als eine halbe Magnitude, aber Komponente A ist noch deutlich schwächer als die Komponente B von STF2727
Sarah Gebauer Germany	100mm (45x)	das Doppel lässt sich bei 45x sauber trennen und bildet mit Gamma2 Delphini ein optisches Doppel-Doppel, da beide Doppelsterne sehr gut in ein Gesichtsfeld passen
Uwe Pilz Leipzig (Germany)	105mm (66x)	im selben Feld mit gamma Del
Uwe Pilz Leipzig (Germany)	105mm (88x)
Robert Zebahl Leipzig (Germany)	152mm (30x)	2021-09-11: Separated but still very close components with moderate brightness difference.
Mark McCarthy Fremont (California/USA)	203mm (205x)	OR Del. Light yellow stars, half delta mag, wide. Physical pair with a 2945.18 year period. In same field with bright pair STF 2727
Mark McCarthy Fremont (California/USA)	317mm (553x)	Super wide, 1 magnitude difference, both faint yellow-white.
Mark McCarthy Fremont (California/USA)	508mm (333x)	Easy, half delta mag and wide. I was after the super close WSI 110 Aa-Ab 0.1" but had no hope of seeing it.
Karsten Kopp Köln (Germany)	600mm (180x)	Leicht zu trennender Doppelstern mit leichtem Helligkeitsunterschied von ca. 0,5 mag. Komponente A leuchtet weißlich und die Komponente B b gelblich.

Berthold Fuchs

Wiesbaden (Germany)

130mm

close DS

../projects/double-stars/berthold-fuchs/photographs/STF%202725.png

★★

STF2727, 12 Del, gamma Del

4^m.4

5^m.0

8.8"

266°

2020

Del

20^h46^m39.50^s / +16°07'27.40"

Christopher Hay Seeheim (Germany)	8x42	On tripod. Definite elongation, and eastern end of elongation (i.e. component A) is definitely brighter than the other end. PA estimated at 240° without prior knowledge.
Christopher Hay Seeheim (Germany)	15x45	Stabilised binoculars, handheld. A very elongated figure-8 very close to popping apart. According to Stelledoppie a physical double with a period of 3249 years. Observed in June 2019 when separation was 8,89“. Will be 8.67“ in 2030 according to Stelledoppie.
Robert Zebahl Leipzig (Germany)	16x70	2021-09-02: Beautiful sight in very nice surrounding. Easy to split, but quite small separation. A rather small difference in brightness is clearly visible. The primary component appears golden in color.
Christopher Hay Seeheim (Germany)	18x80	Very tight pair but clearly split with black in-between. Observed in July 2019 when separation was 8,89“. An excellent object to test the resolution of large binoculars. Struve 2725 a few arcminutes to the southwest is a further good test object for magnifications >20x.
Christopher Hay Seeheim (Germany)	40x80	Widely split, visually strong, dominating the field of view. Component A appears yellowish compared to component B. Struve 2725 in same FOV finely split.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x knapp getrennt - Komponente A ist schön gelb, B im Westen ist gut 1.5 Magnituden schwächer (lt. Stelle Doppie Helligkeitsunterschied nur 0.67 mag) - zusammen mit dem wesentlich schwächeren STF2725 gut 15' südlich sehenswert
Sarah Gebauer Germany	100mm (45x)	bei 45x sauber getrennt und zusammen mit dem DS STF 2725 in einem Gesichtsfeld, dadurch wirken sie wie ein optisches Doppel-Doppel, sehr schön! Beide DS bilden auch einen auffälligen Lichthof
Uwe Pilz Leipzig (Germany)	105mm (66x)	im selben Feld mit STF2725
Uwe Pilz Leipzig (Germany)	105mm (144x)	schon trennbar bei 26x. In einem Feld mit STF2725
Robert Zebahl Leipzig (Germany)	152mm (30x)	2021-09-11: Difference in brightness well visible. Light yellow/golden & lemon yellow.
Mark McCarthy Fremont (California/USA)	152mm (175x)	Gam2 Del. Gorgeous, light yellow-orange A and blue-green B, I like this better than Albireo. Physical with 3249-year period, it will slowly tighten the next couple of hundred years
Mark McCarthy Fremont (California/USA)	152mm (285x)	Gam 2 Del. ! Most beautiful light orange-yellow A and ~1 delta mag blue-green B
Mark McCarthy Fremont (California/USA)	317mm (277x)	Gamma Delphinus. Rich gold-yellow A, blue-white B, ~6" separation estimated by eye. Very pretty pair.
Karsten Kopp Köln (Germany)	600mm (180x)	Recht heller und auch leicht zu trennender Doppelstern mit ca. 0,5 mag Helligkeitsunterschied. Komponente A leuchtet schön gelblich und Komponente B weiß.

★

STT413, 54 Cyg, lambda Cyg

4^m.7

6^m.3

0.9"

1°

2020

Cyg

20^h47^m24.53^s / +36°29'26.70"

Robert Zebahl Leipzig (Germany)	102mm (280x)	The diffraction disk of the primary component was slightly elongated towards north. The air here was however a bit too unsteady for an accurate observation.
Uwe Pilz Leipzig (Germany)	105mm	schwierig
Mark McCarthy Fremont (California/USA)	152mm (175x)	Very unequal mag snowman. Physical with an 800-year period
Robert Zebahl Leipzig (Germany)	152mm (300x)	Observation with an achromat. The fainter component was visible as a permanent brightening of the first diffraction ring.
Robert Zebahl Leipzig (Germany)	152mm (300x)	2020-08-24: Observation with an ED refractor. At 171x partially, at 200x clearly visible as '8'. At 300x two clear, overlapping diffraction disks of differently bright components.
Frederik Wanink Itterbeck (Germany)	254mm (640x)	schwierig aber getrennt
Mark McCarthy Fremont (California/USA)	317mm (553x)	Lambda Cyg: ~1.5 delta mag, blue-white. Bright mess resolves to two disks 0.8-1.0", with seeing.

BU65, 13 Del

5^m.6

8^m.2

1.5"

200°

2016

Del

20^h47^m48.33^s / +06°00'29.50"

Uwe Pilz Leipzig (Germany)	105mm (288x)
Mark McCarthy Fremont (California/USA)	203mm (533x)	13 Del. Suspected at 333x, went up to 533x. The B star seems much fainter about 3 delta mag, and seen only when seeing is still as a blue point just outside first diffraction. ~1.5"