Double Stars - R.A. 12h-18h

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	812
Visual Observations	1410
Sketches	92
Photographs	39
Observers	16
	Werner E. Celnik, Berthold Fuchs, Sarah Gebauer, Christopher Hay, 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)

STF1583

8^m.1

9^m.3

11.3"

284°

2015

UMi

12^h00^m10.43^s / +86°59'40.00"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x ein kleines feines schön eng stehendes Sternpaar - Komponente A ist weiß und die Komponente B schmiegt sich grau-weiß an - Helligkeitsunterschied gut 1.5 Magnituden

STF1591

8^m.4

8^m.9

51.3"

351°

2017

Vir

12^h01^m27.93^s / -00°22'43.60"

8^m.4

12^m.5

23.9"

52°

2017

Robert Zebahl

Leipzig (Germany)

16x70

AB: 2021-03-02: Rather faint double star with well visible brightness difference and moderate separation. Slightly orange & grey-bluish. North in the same field of view is the outstanding double star STTA 116.

STTA116

7^m.8

8^m.5

73.2"

177°

2018

Vir

12^h01^m56.96^s / +00°06'07.50"

Robert Zebahl

Leipzig (Germany)

16x70

2021-03-02: Bright, very easy and striking. The components appear almost equally bright, with the northern one slightly warmer in color. To the south is the fainter double star STF 1591.

67 UMa

FOR1

5^m.2

6^m.7

274.4"

62°

2015

UMa

12^h02^m06.80^s / +43°02'44.30"

ARN5

5^m.2

8^m.5

375.9"

25°

2015

FOR1

5^m.2

8^m.9

363.2"

268°

2015

Robert Zebahl Leipzig (Germany)	8x40	2020-04-05: The pair AB stands out immediately and shows itself in beautiful colors: A white-yellowish, B slightly orange. Almost at right angles to pair AB component C is visible as a faint star at a slightly smaller distance. I did not pay attention to the even fainter component D.
Robert Zebahl Leipzig (Germany)	55mm (27x)	2020-04-05: Components A, B and C easily visible with decreasing brightness. I did not consider component D. A: white-yellowish, B: pale orange. I liked the view in the 8x40 binoculars better.

Robert Zebahl

Leipzig (Germany)

★

A2163

10^m.3

10^m.4

0.7"

169°

2016

Com

12^h02^m12.09^s / +21°07'36.90"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Excellent pair. Hairline split at 333x, nice wide split with 533x. Near equal, >0.5"

HO535

8^m.7

11^m.5

2.9"

147°

2017

Com

12^h02^m29.07^s / +21°44'48.50"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very faint B is seen with averted vision only, well separated ~3". Physical

BRT2413

11^m.1

11^m.2

3.0"

238°

2015

Com

12^h03^m23.03^s / +21°56'54.10"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Fine pair, faint, near equal, can just see above the sky background [not physical]

STF1593

8^m.7

8^m.6

1.2"

15°

2017

Vir

12^h03^m31.79^s / -02°26'49.00"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very finely split near equal white stars, quite a nice pair. Very likely physical, 55% parallax range overlap and 250 AU separation

STF1596, 2 Com

6^m.2

7^m.5

3.7"

236°

2017

Com

12^h04^m16.60^s / +21°27'33.00"

Robert Zebahl Leipzig (Germany)	70mm (100x)	2020-04-04: At 44x almost separated, but clearly visible as figure '8'. At 57x just separated with clearly noticeable difference in brightness. At 100x easy to separate. Primary component appeared white-orange, companion rather greyish.
Mark McCarthy Fremont (California/USA)	80mm (94x)	2 Com. Really nice, 2 delta mag, orange and blue, close but nicely split
René Merting Drachhausen (Germany)	100mm (107x)	bei 107x setzt sich Komponente B knapp ab und zeigt sich westlich von A - Helligkeitsunterschied gut 1.5 Größenklassen
Mark McCarthy Fremont (California/USA)	317mm (443x)	Yellow-white A, 2 delta mag B. Pretty wide.
Mark McCarthy Fremont (California/USA)	508mm (333x)	2 Com. Bright off white pair, wide, ~2 delta mag

BU458

7^m.9

10^m.0

30.1"

236°

2014

Crv

12^h04^m17.11^s / -21°02'21.00"

René Merting

Drachhausen (Germany)

100mm (64x)

bei 64x zeigt sich B sehr schwach im Südwesten von A gut abgesetzt, bei 32x war B nur eine Andeutung und noch zu schwach

COU92

12^m.3

12^m.5

0.8"

115°

2015

Com

12^h04^m38.40^s / +22°31'42.70"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Marginal. I get flashes, very faint, of maybe a star pair but its a bit hazy

STF1600

7^m.6

8^m.3

7.8"

92°

2015

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"

STT244

8^m.1

10^m.6

3.1"

324°

2019

UMa

12^h05^m35.22^s / +52°52'31.70"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

White A and 3 delta mag B, well split. Physical

HU1136

6^m.3

10^m.2

2.1"

212°

2015

UMa

12^h05^m39.70^s / +62°55'59.30"

Mark McCarthy Fremont (California/USA)	178mm (205x)	With seeing, when light yellow A settles to disk, a very faint small haze develops on the edge of A's diffraction, and with best seeing resolves to a very faint small blue round glow, 1" separation. Physical
Mark McCarthy Fremont (California/USA)	317mm (885x)	Tried real hard, up to 885x, but can't say I have it. Thought I had a condensation in the diffraction when seeing settled but not consistent and not a point.

STF1602

8^m.3

9^m.9

21.1"

180°

2017

Dra

12^h07^m07.57^s / +69°04'34.50"

8^m.3

11^m.4

153.8"

315°

2017

René Merting

Drachhausen (Germany)

320mm (72x)

bei 72x zeigt sich B gut getrennt südlich von A - Helligkeitsunterschied mehr als eine Größenklasse - Komponente A reinweiß, B kupfergrau

STF1603

7^m.8

8^m.3

22.6"

84°

2019

UMa

12^h08^m07.07^s / +55°27'50.70"

René Merting Drachhausen (Germany)	18x70	ein Sternpaar, das zu gefallen weiß, etwas mehr als knapp getrennt - B im Nordosten wirkt eine viertel Größenklasse schwächer - leichter Farbunterschied, wobei B zartorange, braunweiß, ockergrau oder so wirkt, naja
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-07: At 22x quite apparent double star in rather poor surrounding. Nice separation with little difference in brightness. Primary component appeared slightly orange, companion grey-bluish. At 44x similar view in color appearance.
Sarah Gebauer Germany	100mm (45x)	schwach, sauber getrennt, nahezu gleich hell, die westliche Komponente ist minimal heller
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x gut getrennt - Komponente B im Osten wirkt grauorange gegen die weiß strahlende Komponente A - Helligkeitsunterschied eine halbe Größenklasse - ein schön isoliert stehendes Sternpaar

STF1604

6^m.9

10^m.0

9.0"

88°

2017

Vir

12^h09^m28.54^s / -11°51'25.40"

6^m.9

8^m.1

10.5"

3°

2017

10^m.0

8^m.1

13.6"

321°

2017

René Merting

Drachhausen (Germany)

100mm (32x)

AC: bei 32x zeigt sich C ganz knapp nördlich von A - leichter Farbunterschied - mehr als eine Größenklasse Helligkeitsunterschied - auf B (10.0 mag/ Sep. 9") habe ich leider nicht geachtet

STF1606

7^m.4

7^m.9

0.7"

143°

2019

CVn

12^h10^m47.34^s / +39°53'29.50"

Robert Zebahl

Leipzig (Germany)

120mm (200x)

2021-04-04: The double star appeared slightly elongated.

S634

7^m.2

8^m.8

4.6"

302°

2020

Crv

12^h11^m22.93^s / -16°47'27.10"

René Merting Drachhausen (Germany)	100mm (107x)	bei 107x zeigt sich B nordwestlich von A leicht abgesetzt, etwas mehr als knapp getrennt - B ist mindestens eine Größenklasse schwächer und eher grau gegen die weiß strahlende Komponente A
Mark McCarthy Fremont (California/USA)	203mm (333x)	Pair of orange stars of equal magnitude widely separated at either end of the FOV. There are two faint blue pairs closer in to one of these. (The orange and the blue are the pair, though it's a surprise since the two orange stars look identical, may have formed together?)

STF1608

8^m.1

8^m.3

13.5"

221°

2019

UMa

12^h11^m27.76^s / +53°25'17.50"

René Merting Drachhausen (Germany)	18x70	wie gemacht für 18x - ein Paar gleich heller Sterne, minimalst getrennt - B scheint im Südwesten zu stehen, der Stern ist nur minimal schwächer
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-19: Easy to find, medium bright. At 22x quite conspicuous with rather small difference in brightness. A difference in color is clearly visible: slightly orange, white-bluish. At 31x nice color contrast with a little more intensive colors: light orange & light blue.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Yellow-white stars, near equal, wide. Physical with a 2236-year period, it is nearing apastron now. It's also variable star MZ UMa, which as best as I can find has a 0.02 magnitude change over a 7.96 day period
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein schönes helles Pärchen, beide Komponenten sind gleich hell und zahncremeweiß

STF1607

8^m.9

9^m.8

27.0"

29°

2019

CVn

12^h11^m33.63^s / +36°05'21.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Wide split, 0.5 delta mag.

STF1609

8^m.0

9^m.6

11.1"

205°

2015

CVn

12^h11^m41.76^s / +50°50'15.80"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Orange and blue, 2 delta mag, pretty.

STF1613

9^m.3

9^m.4

1.2"

7°

2017

CVn

12^h12^m34.01^s / +35°45'45.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very tight equal white, splits clean with the seeing

STF1615

7^m.0

8^m.6

26.8"

88°

2019

Com

12^h14^m06.61^s / +32°47'03.20"

René Merting Drachhausen (Germany)	18x70	ein schickes enges ungleiches Pärchen - Komponente B steht nicht zu knapp getrennt von A im Osten - Helligkeitsunterschied etwa zwei Größenklassen - Komponente strahlt warmweiß, B grauweiß
Mark McCarthy Fremont (California/USA)	178mm (205x)	Very light orange A and very much fainter B which appears with averted vision and I can then just hold it direct, well separated. Physical

STF1618

9^m.5

26.0"

245°

2015

Vir

12^h15^m03.46^s / +09°59'27.10"

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201618.png

STF1622, 2 CVn

5^m.9

8^m.7

11.6"

260°

2017

CVn

12^h16^m07.55^s / +40°39'36.60"

Robert Zebahl Leipzig (Germany)	120mm (86x)	2021-04-04: Beautiful double star with components of very different brightness. Primary component is shining in bright, brilliant orange, the well separated companion appears grey-bluish.
Mark McCarthy Fremont (California/USA)	203mm (205x)	2 CVn Very pretty orange and blue stars, ~3 delta mag, wide. (not physical)

A1781

10^m.2

11^m.0

2.9"

303°

2017

CVn

12^h16^m19.33^s / +44°43'25.90"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Very fine faint pair, 1 delta mag, ~3"

STF1624

7^m.3

10^m.2

5.9"

153°

2015

CVn

12^h16^m42.19^s / +39°35'34.50"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

3 delta white and bluish stars, well separated. WDS uncertain, but no parallax overlap so not likely physical

AG176

10^m.2

2.3"

184°

2017

Com

12^h16^m46.54^s / +30°03'51.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Nice equal white, ~3" separation

STF1626

9^m.4

9^m.6

2.1"

2°

2017

Dra

12^h16^m47.11^s / +70°08'45.70"

Robert Zebahl

Leipzig (Germany)

120mm (150x)

Components similar in brightness, pretty faint, close together, but clearly split.

STT245

5^m.7

11^m.2

8.4"

282°

2016

Com

12^h17^m30.60^s / +28°56'13.60"

Mark McCarthy Fremont (California/USA)	317mm (443x)	Yellow-white A with very faint B due west, wide separation.
René Merting Drachhausen (Germany)	320mm (144x)	bei 72x nichts - bei 144x zeigt sich Komponente B schön abgesetzt westlich von A - der Hauptstern ist gleißend weiß, B ist ein kleines unscheinbares, farbloses Pünktchen - trotzdem nicht uninteressant
Mark McCarthy Fremont (California/USA)	508mm (333x)	Orange-yellow A and orange B, ~3 delta mag, wide

STF1628

9^m.5

10^m.1

9.6"

240°

2015

Vir

12^h18^m42.90^s / +11°47'46.30"

9^m.5

11^m.8

45.1"

345°

2015

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201628.png

STF1630

9^m.5

10^m.3

2.5"

171°

2017

UMa

12^h18^m53.81^s / +56°22'06.00"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Faint pair, 1 delta, well split about 2"
Mark McCarthy Fremont (California/USA)	317mm (553x)	~2", half a delta mag, faint pair, nice.

LEP53, 9 Com

6^m.4

8^m.9

545.5"

224°

2015

Com

12^h19^m29.52^s / +28°09'24.90"

Christopher Hay

Seeheim (Germany)

7x45

Handheld. Secondary wide apart and very faint (NELM 4m9 in target area). No particular colours noted, nor with 15x45 binoculars.
With 12x36 binoculars the pair is very wide and only just still seeming to belong together. With 15x45 binoculars already too far apart for a double-star impression to arise.
Lepine 53 is a physical double at a distance to us of 178 light years on the north-western fringe of Coma Cluster Melotte 111.

★

BU27

7^m.1

10^m.5

3.6"

104°

2015

Com

12^h20^m04.86^s / +13°51'18.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Light orange A and very faint bluish B, seen with averted vision at first then can hold direct. ~4" to west. Nice!

STF1632

6^m.8

10^m.0

10.1"

192°

2015

CVn

12^h20^m13.50^s / +37°54'07.70"

Robert Zebahl Leipzig (Germany)	120mm (86x)	2021-04-04: Relatively wide pair with large difference in brightness. Primary component appeared white-yellowish with faint companion.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Light yellow and 3 delta B, wide. WDS lists physical and I agree

STF1633

7^m.0

7^m.1

8.9"

245°

2017

Com

12^h20^m41.37^s / +27°03'16.40"

Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-04: At 22x beautiful pair of equally bright components at quite small separation. At 44x a slight color difference was visible: white-orange & white-bluish.
Mark McCarthy Fremont (California/USA)	80mm (94x)	Close, equal white stars
Mark McCarthy Fremont (California/USA)	317mm (443x)	Yellow-white, equal brightness, wide separation to NE.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein schönes Pärchen zweier gleich heller Sterne - dicht beieinander stehend, aber gut getrennt - obwohl beide mitten im Coma Cluster stehen, zeigen sie sich schön isoliert
Mark McCarthy Fremont (California/USA)	508mm (333x)	Nice & wide, easy, bright light yellow stars

STF1634

8^m.8

9^m.9

5.4"

147°

2018

Com

12^h20^m42.06^s / +22°54'51.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Light yellow A and slightly blue B, wide, ~2 delta mag

Messier 40, M40, Winnecke 4, WNC4

9^m.7

10^m.1

50.0"

83.0°

UMa

12^h22^m12.53^s / +58°04'58.60"

Winnecke 4 is an optical double star with an angular distance of 50 arc seconds. Charles Messier had probably mistaken this double star as a nebula and therefore included it in his catalog. It is the only double star in Messier's catalog.

René Merting Drachhausen (Germany)	8x20	knapp direkt sichtbar, indirekt wie ein schwacher Stern - leicht diffuser Eindruck
René Merting Drachhausen (Germany)	8x30	beide Sterne sind sehr schwach als längliche Aufhellung zu erkennen, mehr nicht
René Merting Drachhausen (Germany)	10x50	zwei relativ einfach zu sehende schwache Sterne, ordentlich getrennt - beide Sterne sind gleich hell
Robert Zebahl Leipzig (Germany)	16x70	2021-09-02: Easy to separate, but quite faint and inconspicuous. A small difference in brightness is visible.
René Merting Drachhausen (Germany)	16x70	Zenitbeobachtung (leider kein echter Vorteil im Fujinon) - direkt als kompakter nebliger Fleck erkennbar, indirekt offenbaren sich zwei Sterne
René Merting Drachhausen (Germany)	18x70	Zenitbeobachtung (definitiv ein Vorteil, weil besseres Einblickverhalten als beim Fujinon 16x70) - zwei relativ einfach zu sehende schwache Sterne, ordentlich getrennt - beide Sterne sind gleich hell
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x sind beide Komponenten gut getrennt erkennbar - beide Sterne sind schwach und ohne großen Helligkeitsunterschied, der Stern im Osten wirkt leicht schwächer - zurück auf 20x sind beide Sterne noch immer bequem getrennt voneinander zu bestaunen
René Merting Drachhausen (Germany)	200mm (40x)	bei 40x sind eindeutig zwei gleichhelle nah beieinander liegende Sterne auszumachen
René Merting Drachhausen (Germany)	320mm (45x)	ein Sternpaar, das komfortabel getrennt ist - beide Sterne wirken grauorange

SHJ143, 12 Com

4^m.9

11^m.8

37.0"

57°

2015

Com

12^h22^m30.32^s / +25°50'46.30"

4^m.9

8^m.9

65.2"

167°

2015

Mark McCarthy Fremont (California/USA)	203mm (205x)	AC: Wide separation white and bluish, 3 delta mag. I feel like there is a fainter star closer in and 90 degrees PA from the B star. [AB is the fainter pair, 4.86/11.8 36.7", AC is the main pair described.]
René Merting Drachhausen (Germany)	320mm (72x)	AC: bei 72x ist Komponente C weit abseits im Süden von A erkennbar - der Hauptstern strahlt maisgelb, C grau, dadurch schöner Farbkontrast

STF1636, 17 Vir

6^m.5

9^m.3

21.0"

338°

2017

Vir

12^h22^m32.14^s / +05°18'20.10"

René Merting Drachhausen (Germany)	18x70	A und B sind knapp getrennt erkennbar - B sitzt im NW von A - großer, nicht abschätzbarer Helligkeitsunterschied - nett anzusehen, wenn man B erst einmal entdeckt hat
Mark McCarthy Fremont (California/USA)	317mm (340x)	17 Virginis, widely separated, large magnitude difference, with a yellow-white A and a ruddy / brownish B

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201636.png

★

STT249

8^m.2

9^m.2

0.4"

257°

2016

UMa

12^h23^m50.80^s / +54°09'30.50"

Mark McCarthy

Fremont (California/USA)

317mm (738x)

very slightly notched elongation / overlapped disks.

STF1638

10^m.3

10^m.7

8.3"

282°

2017

CVn

12^h24^m13.24^s / +43°03'37.10"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint pair, considerable delta, wide. Not physical

STF1639

6^m.7

7^m.8

1.8"

323°

2018

Com

12^h24^m26.81^s / +25°34'56.70"

6^m.7

11^m.4

91.4"

159°

2015

Robert Zebahl Leipzig (Germany)	70mm (133x)	AB: 2020-04-04: The double star is clearly elongated, with the fainter companion attached to the primary component.
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: White and slightly blue pair, close, around 3"
Mark McCarthy Fremont (California/USA)	317mm (443x)	AB: Close but well split, 1.5 delta mag, ~2.5"
Mark McCarthy Fremont (California/USA)	508mm (333x)	AB: Pretty yellow stars, ~2" separation, ~2 delta mag

STF1642

8^m.8

9^m.4

2.5"

180°

2019

CVn

12^h25^m45.00^s / +44°44'04.40"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Closely separated 1 delta light yellow stars. WDS uncertain, and I find there is no overlap in the parallax ranges, with 1 parsec separating the ranges, so these are not physical
Mark McCarthy Fremont (California/USA)	317mm (277x)	Very nice light orange and blue, 1 delta mag, ~3"

STF1643

9^m.0

9^m.4

2.7"

4°

2018

Com

12^h27^m13.72^s / +27°01'29.60"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Equal orange pair, ~3", PA to north.
Mark McCarthy Fremont (California/USA)	508mm (333x)	Yellow-white stars, ~3" separation, ~2 delta mag

COU53

12^m.1

12^m.7

2.4"

213°

2017

Com

12^h27^m58.02^s / +21°58'11.90"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Faint pair, split clearly with averted vision, hazy with direct. A nice pair

STF1645

7^m.5

8^m.1

9.8"

156°

2017

CVn

12^h28^m04.45^s / +44°47'39.50"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Slight delta, wide, pretty light yellow-white stars. WDS lists as physical, and I agree
Gerd Kohler Langenzenn (Germany)	254mm (76x)	Der Doppelstern ist getrennt. Bläulich-weiß - bläulich-weiß. Gleiche Helligkeit.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Wide, bright yellowish-white pair, ~1 delta mag

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201645.png

★

STF1646

10^m.3

12^m.9

5.6"

260°

2017

CVn

12^h28^m09.12^s / +36°41'02.10"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Faint, B seen averted vision only, fairly close. WDS claims physical but there is no parallax overlap, with a 2 parsec gap -- too far to be gravitationally bound
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow and blue. Need averted vision for B to reveal itself. Pretty!

★★

STFA21, 17 Com, AI Com

5^m.2

6^m.6

146.4"

251°

2018

Com

12^h28^m54.72^s / +25°54'46.40"

Christopher Hay Seeheim (Germany)	7x45	Handheld. Well split, strong compact pair. Component A seems bluish, B warmer. At this low power 17 Com is the most double-starish pair in Melotte 111, the Coma Star Cluster. Fantastic star-strewn 8.6° FOV with the stars of the cluster. A physical double at a distance to us of 238 light years.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein weit auseinander stehendes Paar - schöner Farbkontrast, A weißblau, B im SW leicht gelblich schimmernd

STT251

8^m.3

9^m.3

0.7"

55°

2018

CVn

12^h29^m07.72^s / +31°23'25.40"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Decidedly not round disk -- there's also a brightening in the diffraction. Marginal.
Mark McCarthy Fremont (California/USA)	508mm (667x)	Best seen at 667x, but could also see at 533x and 445x. Split, much fainter B about 1.5 delta mag, light orange A and blue B. 540.56-year period, it will reach apastron in 100 years but makes a very close periastron in 400 years

BU1324

9^m.8

10^m.6

2.4"

224°

2017

Com

12^h29^m30.02^s / +29°30'45.80"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Well split ~3", 1 delta, yellow-orange stars. Physical

SHJ145, delta Crv, 7 Crv, Algorab

3^m.0

8^m.5

24.2"

216°

2020

Crv

12^h29^m51.86^s / -16°30'55.60"

Robert Zebahl Leipzig (Germany)	70mm (47x)	Large difference in brightness and pretty wide apart. Primary component appeared white-bluish. The B component was too faint for seeing colors.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ein schöner Doppelstern - A ist weiß, leicht hellgelb - B steht gut getrennt im Südwesten, ganz schwach, mehr als 3 Größenklassen schwächer

HJL1069

7^m.8

10^m.1

115.4"

312°

2015

Com

12^h30^m19.91^s / +21°56'53.60"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Lovely wide pair, 2.5 delta mag. Clean image

★

J1023

11^m.4

11^m.9

5.2"

173°

2019

CVn

12^h30^m46.44^s / +36°39'34.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Excessively faint, averted vision required to pick out, well separated.

★★★

SHJ146

7^m.7

8^m.7

49.5"

290°

2017

Vir

12^h31^m14.61^s / +01°19'37.00"

René Merting Drachhausen (Germany)	18x70	Komponente B ist westlich von A erkennbar - Helligkeitsunterschied 1.5 Magnituden - A weiß, B grau - das Sternpaar fällt auf, weil kaum gleichhelle Sterne in der Umgebung stehen
Robert Zebahl Leipzig (Germany)	70mm (33x)	Visible difference in brightness and color. I couldn't precisely define the colors itself, but A appeared rather orange, B rather bluish.
Robert Zebahl Leipzig (Germany)	102mm (28x)	Pretty wide pair with visible difference in brightness and lovely color contrast. A: pale orange, B: light blue.

STF1649

8^m.0

8^m.4

15.7"

194°

2020

Vir

12^h31^m36.46^s / -11°04'20.20"

René Merting

Drachhausen (Germany)

18x70

ein sehr enges, helles Pärchen - Komponente B im Süden knapp getrennt und minimal schwächer - sehenswert, da kaum gleichhelle Sterne im Umfeld sichtbar sind

STF1652

10^m.1

10^m.4

6.1"

178°

2017

Com

12^h32^m31.07^s / +21°06'03.30"

Mark McCarthy Fremont (California/USA)	203mm (333x)	KK Com. Wide, ~1 delta mag, pleasing view [very slight magnitude variance only 0.2 mag.]
Mark McCarthy Fremont (California/USA)	317mm (553x)	Faint near equal, pretty wide 5-6".

STF1653

9^m.7

8.0"

343°

2017

CVn

12^h33^m22.34^s / +32°02'23.40"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Wide one delta white pair. WDS claims physical but there is no parallax overlap
Mark McCarthy Fremont (California/USA)	317mm (553x)	Easy, near equal pair, yellowish A and bluish B. ~10"

★★

WRH12, 23 Com

5^m.0

6^m.9

0.3"

12°

2016

Com

12^h34^m51.12^s / +22°37'45.10"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

23 Com. I get a definite snowman and can tell the larger from the smaller star, pointed in a certain direction in relation to a faint field star. Short Period double

HJL1070

8^m.2

240.2"

79°

2015

CVn

12^h34^m59.37^s / +36°19'30.90"

Christopher Hay

Seeheim (Germany)

15x45

Handheld, binoculars with internal stabilisation. Extremely wide, evenly matched. Would not normally look like a double at this power but is held together visually by the Upgren 1 asterism, of which it is a member.
A common proper motion pair. HJL = Halbwachs, J.L.

★★

STF1657, 24 Com

5^m.1

6^m.3

20.2"

272°

2018

Com

12^h35^m07.76^s / +18°22'37.40"

Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. Clean split. Strong pair dominating 4.5° FOV. Primary pale yellow. Secondary too close for clear colour impression but certainly colder. A physical double at a distance to us of 450 light years.
René Merting Drachhausen (Germany)	18x70	ein wunderschönes eng stehendes FG-Sternpaar - Komponente B im Westen ist 1.5 Magnituden schwächer - A strahlt weißgelb, B wirkt dagegen etwas unterkühlt
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-04: Splendid sight! Very nice difference in brightness and color: pale orange & grey-blue.
Mark McCarthy Fremont (California/USA)	80mm (94x)	24 Com. Lovely bright orange A and blue B, wide. Very deserving of its showcase reputation
Robert Zebahl Leipzig (Germany)	102mm (28x)	Very beautiful view with moderate distance and difference in brightness. A: glossy, light orange, B: white- bluish.
Christopher Hay Seeheim (Germany)	125mm (64x)	Well apart. Hugely dominant in 1.3° FOV. Primary slightly orangish yellow, secondary ice blue, extremely attractive.
Robert Zebahl Leipzig (Germany)	200mm (60x)	Well split with obvious difference in brightness. Fainter component appeared bluish, the brighter one slightly orange.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Very pretty bright light orange and fainter blue, wide separation. Such a sight!

STF1662

7^m.8

9^m.8

19.3"

243°

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

★★

AG180

7^m.8

9^m.8

0.3"

355°

2007

Com

12^h36^m48.74^s / +20°14'15.80"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Most remarkable. I can see the light orange airy disk of A, though it dances in diffraction. When seeing stills, a very fine, very small point presents itself for a moment before being washed out. Consistently in the same place as I move the eyepiece about

STF1663

8^m.0

9^m.2

0.5"

65°

2017

Com

12^h37^m10.81^s / +21°11'52.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Hairline split, ~1 delta mag, tough. Light yellow-orange A

COU392

10^m.3

11^m.0

2.1"

335°

2017

Com

12^h37^m22.38^s / +23°21'28.40"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Faint pair, B star seen with averted vision only

STF1664

7^m.8

9^m.2

38.7"

223°

2019

Vir

12^h38^m19.95^s / -11°31'01.10"

7^m.8

11^m.5

60.7"

306°

2019

7^m.8

12^m.4

83.8"

291°

2019

7^m.8

8^m.6

121.4"

110°

2019

9^m.2

11^m.5

68.1"

341°

2019

9^m.2

12^m.4

77.9"

318°

2019

11^m.5

12^m.4

30.0"

258°

2019

8^m.6

8^m.9

92.7"

112°

2019

René Merting

Drachhausen (Germany)

18x70

AB: ein ordentlich getrenntes Pärchen - B im Südwesten ist gut eine Größenklasse schwächer - A zeigt ein wenig Farbe, weißgelblich

STF1666

8^m.2

10^m.3

7.4"

192°

2017

Com

12^h39^m10.03^s / +14°19'38.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Nice pair, very wide, ~2 delta mag. Physical

★★★

STF1670, gamma Vir, 29 Vir, Porrima

3^m.5

3.0"

357°

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.

STF1672

8^m.9

10^m.2

4.3"

312°

2019

CVn

12^h42^m39.65^s / +33°48'51.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

B is quite faint but can see direct, well separated white. Not physical

STT253

8^m.0

10^m.5

6.5"

238°

2015

Com

12^h43^m59.85^s / +21°10'22.90"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Blue-white A and can detect B with direct vision, but it flashes with averted. Wide

HO256

7^m.3

9^m.6

0.5"

120°

2016

CVn

12^h44^m08.82^s / +35°46'07.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

The airy disk is not clean indicating it's not single, but can't split for the seeing. Marginal

STF1678

7^m.2

7^m.7

37.5"

170°

2018

Com

12^h45^m26.17^s / +14°22'24.90"

Robert Zebahl Leipzig (Germany)	8x40	2020-04-05: Clearly separated, but still quite close together with a fainter companion. Well visible difference in brightness without any detectable colors.
René Merting Drachhausen (Germany)	18x70	ein schönes helles Sternpaar, komfortabel getrennt - Komponente B im Süden ist nur minimal schwächer als A
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-04: At 22x noticeable double star with slight difference in brightness. Primary component appeared white-yellowish, companion appeared slightly orange. The color impression was a little better visible at 44x.
Mark McCarthy Fremont (California/USA)	317mm (443x)	Wide separation near equal white pair

STF1679

9^m.6

10^m.0

5.9"

208°

2017

CVn

12^h46^m00.83^s / +49°49'23.00"

9^m.6

13^m.7

69.1"

37°

2015

Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: White 1 delta, wide. WDS is uncertain but there is good parallax overlap and 1183 AU separation, so likely physical
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Fairly faint equal magnitude, 3"

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201679.png

STF1680

9^m.4

11^m.6

2.9"

335°

2015

Com

12^h49^m12.97^s / +21°46'30.00"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

B seen with averted vision at first then I could hold it with direct, well separated, faint pair

★★★

STF1694

5^m.3

5^m.7

21.8"

324°

2017

Cam

12^h49^m13.80^s / +83°24'46.30"

Christopher Hay Seeheim (Germany)	7x45	Handheld. Very elongated with absolutely clear PA, but hand tremor prevents separation.
Christopher Hay Seeheim (Germany)	7x50	On tripod. Split with a sliver of black inbetween, with creamy-white components, attractive sight. Dry-frozen night in January, 47° elevation above horizon.
Christopher Hay Seeheim (Germany)	10x42	Binoculars with internal stabilisation, handheld. Fine split with definite difference in brightness of components.
Christopher Hay Seeheim (Germany)	15x45	Binoculars with internal stabilisation, handheld. AB cleanly split with distinct difference in magnitudes. Strong visual presence of this physical double is enhanced by the complete lack of visual competition in 4.5° FOV. Interesting to contemplate that in the 9th century AD Struve 1694 was just as close to the celestial north pole as Polaris (also a physical double) is today. Also known as 32H Cam, which comes from the celestial map produced by Johannes Hevelius in the late 17th century.
Christopher Hay Seeheim (Germany)	25x80	Well apart but by no means falling apart, and totally dominating the 3.2° field of view. Neither component would appear particularly colourful on its own, but viewed together the primary is definitely more on the orange side and the secondary more bluish. At 25x in 3.2° FOV and with an exit pupil around 3mm making the sky background pitch-black, STF 1694 has such a strong visual impact that it becomes a showpiece specimen of a double star. Three-star rating awarded because of this strong visual presence plus binocular accessibility (see 7x50 observation) plus true physical nature of the double (according to Stelledoppie) plus pole-star role in the Middle Ages.
Robert Zebahl Leipzig (Germany)	70mm (15x)	Easy to split with noticeable angular distance and slight difference in brightness. The faint component tends to be more bluish, the brighter one appeared more light yellowish.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x strahlen beide Komponenten richtig hell und gut getrennt - leichter Farbkontrast, Komponente A ist leicht gelblich, B wirkt eher unterkühlt

STF1681

8^m.9

9.2"

17°

2016

Vir

12^h49^m34.82^s / +03°49'05.60"

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201681.png

★

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.

★

STFA23, 32 Com

6^m.5

7^m.0

196.3"

51°

2015

Com

12^h52^m12.26^s / +17°04'26.20"

6^m.5

8^m.9

905.4"

262°

2015

Christopher Hay Seeheim (Germany)	7x45	AB: Wide compact pair. Component A (=32 Com) is brighter than component B (=33 Com) and orangish. Nice in 8.6° FOV together with globular cluster M53, which presents as a fluffy little ball. 2° north of 32/33 Com is an interesting 2° long east-west oriented clustering of stars, and 1° north of M53 is a similar, brighter and more compact clustering. Overall an extremely attractive field.
Robert Zebahl Leipzig (Germany)	8x40	AB: 2020-04-05: Widely separated pair. The component A (32 Com) appeared slightly orange, the component B rather grey-bluish. Overall a beautiful sight. The double star is located right in the middle between the two bright stars 27 & 36 Com.
Christopher Hay Seeheim (Germany)	15x45	AB: Striking pair, very wide but holding together well thanks to matched brightnesses. Component A (=32 Com) more orangish, component B (=33 Com) more bluish.

STF1686

8^m.6

8^m.7

5.7"

187°

2015

Com

12^h52^m58.16^s / +15°01'53.50"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Fine near equal pair of yellow-white stars, wide separation, PA to south.
Mark McCarthy Fremont (California/USA)	508mm (333x)	Near equal white, wide

COU1579

9^m.4

9^m.7

0.2"

121°

2008

CVn

12^h53^m17.33^s / +42°46'16.80"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Very tough notched elongation and instants of splits, I had difficulty sketching it and estimated PA west of north or along that line. Very small scale. Actual PA is SSE, so I had the alignment correct. It will be at periastron next year, and get to easy split by 2029 at around 0.231", at the opposite quadrant

STF1687, 35 Com

5^m.2

7^m.1

1.3"

198°

2019

Com

12^h53^m17.77^s / +21°14'42.10"

5^m.2

9^m.8

28.5"

127°

2016

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

★

STF1688

9^m.2

11^m.1

14.4"

344°

2015

CVn

12^h53^m35.26^s / +37°58'20.90"

Mark McCarthy Fremont (California/USA)	178mm (205x)	White B and B is very faint, wide, can just hold it direct vision. Not physical
Mark McCarthy Fremont (California/USA)	317mm (71x)	a faint pair, yellow A and orangish B, which I identified using 340x, but can still split at 71x with STF 1692 & STF 1702 in the same low power field

S643

7^m.1

8^m.2

23.5"

295°

2020

Crv

12^h54^m00.29^s / -18°02'15.40"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x ein schön anzusehendes Sternpaar - ordentlich getrennt, konkurrenzlos - A schön weiß, B blaugrau

★

MET9

5^m.7

7^m.8

1.7"

50°

2016

Com

12^h54^m39.98^s / +22°06'28.80"

Mark McCarthy

Fremont (California/USA)

203mm (667x)

Using 8" 205x I see nothing. 8" 410x suspect elongation. 8" 667x I see a fleeting, bluish point just outside of first diffraction ring. A is light yellow orange and bright, 2 delta mag. to B. A star feels elongated / egg shaped. With 20" and 667x the seeing is too messy though there is a knot in the diffraction where I had noticed the point with 8". Strong feeling A is elongated.

STF1689

7^m.1

9^m.1

30.2"

223°

2015

Vir

12^h55^m30.32^s / +11°29'46.40"

René Merting Drachhausen (Germany)	18x70	ein sehr ungleiches Paar - Komponente A ist der hellste Stern in der Umgebung, B ist sehr schwach und steht ordentlich abgesetzt im Südwesten von A - Helligkeitsunterschied 2.5 Magnituden
Mark McCarthy Fremont (California/USA)	317mm (443x)	Orange and blue, very wide separation

★★

STF1692, 12 CVn, alpha CVn, Cor Caroli

2^m.9

5^m.5

19.5"

230°

2018

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

STF1695

6^m.0

7^m.8

3.9"

281°

2017

UMa

12^h56^m17.64^s / +54°05'58.10"

6^m.0

12^m.3

131.7"

139°

2015

Robert Zebahl Leipzig (Germany)	70mm (57x)	AB: Easily separable, but still quite close together with a relatively large difference in brightness. The companion appeared only as a tiny star.
Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: Light yellow-white A, and a deeper yellow B, 2 delta mag, well split, attractive pair. Physical

STT256

7^m.3

7^m.6

1.1"

101°

2017

Vir

12^h56^m26.59^s / -00°57'16.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Wide separation equal brightness white stars

BU925

7^m.0

11^m.1

6.5"

209°

2016

CVn

12^h56^m38.81^s / +43°33'07.20"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Bright white and extremely faint B, wide separation. B flashes with averted vision to see, can hold with direct vision with seeing

STT257

8^m.5

9^m.6

12.9"

353°

2019

CVn

12^h56^m44.77^s / +45°36'45.10"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Easy wide one delta. WDS claims physical but there is no parallax overlap, so these are not gravitationally bound
Mark McCarthy Fremont (California/USA)	317mm (277x)	Wide white and dull blue-white pair.

STF1696

9^m.4

9^m.5

3.7"

204°

2017

Com

12^h57^m24.25^s / +30°22'15.50"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Fine pair if a little dim, blue-white stars, half delta, wide ~4"
Mark McCarthy Fremont (California/USA)	317mm (553x)	Fairly faint near equal white pair.

★

STF1702

8^m.7

9^m.4

35.9"

83°

2017

CVn

12^h58^m31.97^s / +38°16'43.60"

Mark McCarthy

Fremont (California/USA)

317mm (71x)

wide orange-yellow pair, in same low power field as STF 1692 & STF 1688

STF1699

8^m.7

8^m.8

1.7"

12°

2017

Com

12^h58^m40.88^s / +27°28'27.80"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Close 1.5" equal white.
Mark McCarthy Fremont (California/USA)	508mm (333x)	White near equal pair, ~1.5" separation. Nice

STF1700

8^m.9

10^m.5

7.4"

84°

2017

Com

12^h58^m43.08^s / +27°07'10.20"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

White, wide, very faint B, ~7" and 2 delta. Not physical

STF1701

7^m.6

9^m.9

21.5"

306°

2015

Vir

12^h59^m20.16^s / +06°30'21.10"

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201701.png

78 UMa, BU1082

5^m.0

7^m.9

0.7"

141°

2019

UMa

13^h00^m43.59^s / +56°21'58.80"

Uwe Pilz

Leipzig (Germany)

105mm (260x)

nicht getrennt

STF1707

9^m.7

11^m.5

8.3"

41°

2016

Com

13^h01^m14.16^s / +15°51'45.20"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

B is wide and faint, seen with averted vision at first and held direct after foveal coaxing

★

STF1709

7^m.9

10^m.0

2.7"

252°

2016

Com

13^h02^m30.62^s / +23°29'57.80"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Nice! Brighter yellowish white A and 4 delta magnitude B, wide separation ~3" to west.
Mark McCarthy Fremont (California/USA)	508mm (333x)	White stars, ~2 delta mag, ~3" separation. Very attractive pair

COU95

9^m.7

11^m.3

0.7"

287°

2010

Com

13^h02^m34.66^s / +23°17'38.60"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Tentative split at 333x, definite with 533x, with seeing for both. More than 1 delta mag, >0.5" separation

KR41

9^m.7

10^m.1

3.6"

332°

2019

UMa

13^h02^m38.02^s / +56°25'11.10"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint pair, well separated, 1 delta, B just visible direct and it brightens considerably with averted vision. Not Physical

STF1712

10^m.2

10^m.6

9.1"

332°

2016

Vir

13^h03^m32.39^s / +09°28'08.00"

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201712.png

STF1714

10^m.3

10^m.4

3.1"

308°

2017

Com

13^h03^m40.25^s / +23°38'35.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Near equal white, ~3". Surprisingly not physical

STF1718

AB-C

9^m.8

10^m.1

13.1"

272°

2015

CVn

13^h05^m30.27^s / +50°59'11.00"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

faint equal pair with wide separation. AB is 0.2" not seen--BU 643

★

HO257

10^m.4

10^m.9

2.0"

154°

2016

Com

13^h05^m51.04^s / +26°13'36.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Equal white, nice, ~2"

HJ2638

A-BC

7^m.5

11^m.1

6.2"

223°

2015

Com

13^h06^m10.29^s / +29°01'45.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very faint blue preceding a bright white. Did not notice BC, BU 1083, 0.4"

HJ2639

7^m.5

11^m.2

36.0"

158°

2015

CVn

13^h06^m13.50^s / +40°55'21.00"

7^m.5

10^m.8

52.3"

137°

2015

11^m.2

10^m.8

22.9"

102°

2015

Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Nice triple. Orange-yellow A and bluish 2 delta mag B and C, wide sep.
Mark McCarthy Fremont (California/USA)	317mm (277x)	AC: Nice triple. Orange-yellow A and bluish 2 delta mag B and C, wide sep.

★

COU11, 39 Com

6^m.1

8^m.8

1.8"

315°

2019

Com

13^h06^m21.28^s / +21°09'12.60"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

39 Com. Very beautiful pair, A is creamy white, B is much fainter and bluish, ~1.5", resolved with seeing just beyond first diffraction

STF1719

7^m.6

8^m.2

6.9"

359°

2019

Vir

13^h07^m19.75^s / +00°35'06.70"

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201719.png

★

COU2708

9^m.6

10^m.5

4.0"

78°

2016

Com

13^h08^m04.40^s / +23°24'42.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

B seen with averted vision, then I can hold direct. White stars, ~5". Nice. Physical

STF1723

8^m.7

10^m.1

6.1"

12°

2019

CVn

13^h08^m13.49^s / +38°44'20.20"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Light yellow and light orange, 1.5 delta mag, well split

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201723.png

STF1722

8^m.4

9^m.3

2.5"

337°

2017

Com

13^h08^m26.46^s / +15°29'29.90"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Nice pair, white A and yellowish B, ~3" and ~2 delta mag
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange A, 1 delta mag B, ~3". Faint pair.

STF1727

9^m.8

11^m.0

7.5"

333°

2015

CVn

13^h09^m52.02^s / +31°22'00.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

B is faint but not too hard to pick out, well separated. Physical, and I agree

STF1724, theta Vir, 51 Vir

4^m.4

9^m.4

6.8"

342°

2014

Vir

13^h09^m57.01^s / -05°32'20.10"

Robert Zebahl Leipzig (Germany)	70mm (47x)	Easy to split with large difference in brightness. Very faint B component clearly apart from the primary component.
Mark McCarthy Fremont (California/USA)	80mm (92x)	Extremely faint B, just visible, brighter white

★★

STF1728, 42 Com

4^m.8

5^m.5

0.6"

193°

2019

Com

13^h09^m59.28^s / +17°31'46.00"

AB-C

4^m.4

11^m.4

84.8"

349°

2014

Mark McCarthy Fremont (California/USA)	317mm (443x)	AB-C: Alpha Com: Bright yellow, very faint blue B
Mark McCarthy Fremont (California/USA)	508mm (1067x)	AB: Diadem. !! Most definite well split near equal, light yellow-orange. A faint star [AB-C] also in the field to tell orientation. Short period, made sketch. Wow!

★

STFA24

6^m.0

6^m.3

275.6"

296°

2012

CVn

13^h10^m03.27^s / +38°29'55.90"

This double star contains of the components 15 and 17 CVn.

Robert Zebahl Leipzig (Germany)	8x40	Both components similar in brightness with large distance.
Christopher Hay Seeheim (Germany)	15x45	Already clearly split in 3x opera glass. In 15x45 the pair becomes interesting due to clear colour contrast, 17 CVn orangish, 15 CVn much colder, almost bluish. Charming in 4.5° FOV together with asterism two degrees northeast made up of 19/20/23 CVn plus an unnamed fourth bright star to the southwest of those three.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Wide bright pair
René Merting Drachhausen (Germany)	320mm (45x)	extrem weit getrennt, ein auffälliges Trio zusammen mit 16 CVn nördlich - eher etwas für Kleinst-Ferngläser

COU96

6^m.8

10^m.8

10.8"

310°

2015

Com

13^h10^m52.35^s / +21°14'01.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

White A, very faint B, can detect it direct vision but brightens with averted

COU54

6^m.8

10^m.9

10.5"

288°

2015

Com

13^h11^m32.36^s / +21°55'07.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Brighter white A, need averted vision for B, wide

STT261

7^m.4

7^m.6

2.6"

338°

2018

CVn

13^h12^m02.02^s / +32°05'07.90"

Robert Zebahl Leipzig (Germany)	70mm (57x)	2020-04-20: At 44x immediately visible as figure '8', even separable on closer look. The components appeared similarly bright. Overall rather dim. At 57x clearly split, but still very close together with a small difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Light yellow-white equal pair, ~1.5"

STF1732

8^m.7

10^m.4

25.9"

127°

2015

UMa

13^h12^m37.57^s / +58°26'56.60"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Wide AB and I suspect BC with the 7-inch mask, and with 20-inch I have a stronger sense of it but it doesn't resolve to a point, it's more haze, ~2". Physical

RST3829 & SHJ162

RST3829

Aa-Ab

7^m.3

9^m.1

0.5"

166°

2018

Vir

13^h14^m55.72^s / -11°22'09.90"

SHJ162

7^m.1

8^m.2

113.2"

45°

2017

SHJ162

8^m.2

13^m.3

66.2"

136°

2015

René Merting Drachhausen (Germany)	100mm (32x)	SHJ162 (AB): bei 32x weit auseinander stehend - ein eigentümlicher Farbkontrast, A strahlt weiß, B kupfern
Mark McCarthy Fremont (California/USA)	317mm (340x)	SHJ162 (AB): a widely separated yellow A and orange B, 1 magnitude difference.

★★

BGH46

6^m.5

7^m.6

202.9"

58°

2015

Com

13^h16^m32.26^s / +19°47'07.00"

Christopher Hay Seeheim (Germany)	7x45	Handheld. Well apart. Nice in 8.6° FOV with very similar, slightly wider and brighter 1 Boo six degrees due east. BGH = S. van den Bergh. BGH46 is a physical double at a distance to us of 279 light years.
Robert Zebahl Leipzig (Germany)	8x40	2020-04-05: Widely separated with well visible difference in brightness. A appeared slightly white-bluish, B darker in color and not clearly definable.
Christopher Hay Seeheim (Germany)	15x45	Wide apart. Would probably no longer feel like a pair in a crowded Milky Way field, but here, not all too far from the North Galactic Pole, the two components hold together well (and are indeed a physical pair). Very attractive 4.5° FOV to south with east-west string of stars followed by fluffy ball of globular M53 and finally brilliant Alpha Com.
Mark McCarthy Fremont (California/USA)	80mm (13x)	Wide finder split, 1 delta mag, not much to recommend. Triangle of stars to the south, pointing to Bgh 46. [I did look at this at 667x to see if one of the wide pair had a pair of its own, but did not scrutinize well enough. This one should try on a really good night with 20": HDS1862 = Aa,Ab 6.56/9.69 0.4".]
Mark McCarthy Fremont (California/USA)	178mm (205x)	Super-wide pair even in the finder, and I am very surprised to see it is listed as physical, at least as proper motion is concerned. The close pair HDS1862Aa-Ab I thought I saw but it is too fleeting, seeing not supporting higher magnification. Reviewing the Gaia DR3 data, which includes parallax, it confirms there is overlap in the weighted distance but the weighted separation of the pair is 19,121 AU, which means this is very likely not a physical pair

★

BU800

6^m.7

9^m.5

7.6"

104°

2018

Com

13^h16^m51.05^s / +17°01'01.90"

Christopher Hay Seeheim (Germany)	125mm (36x)	AB, March 2019: Clearly split in good moments, but secondary popping in and out of view in instable seeing. A physical double only 36 light years distant to us.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Nice pair, A is a light but rich yellow, B is blue-white. Wide, ~2 delta mag
Mark McCarthy Fremont (California/USA)	317mm (553x)	Not difficult, orange-yellow A with bluish B, 3 delta mag. pretty wide to east.

★★

HU644

9^m.1

9^m.9

0.1"

354°

2019

CVn

13^h19^m45.58^s / +47°46'41.10"

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

STF1734

6^m.8

7^m.3

1.1"

173°

2017

Vir

13^h20^m41.57^s / +02°56'31.90"

Robert Zebahl Leipzig (Germany)	70mm (104x)	Double star appeared slightly elongated without noticeable notching.
Mark McCarthy Fremont (California/USA)	203mm (333x)	Blue-white A, light orange B, half delta mag, close ~1.5". Nice!

STF1737

7^m.8

10^m.3

15.3"

219°

2016

Com

13^h21^m48.68^s / +17°45'55.70"

René Merting

Drachhausen (Germany)

320mm (45x)

bei 45x einfach - Komponente B steht gut abgesetzt westlich von A - Helligkeitsunterschied gut 2.5 Magnituden - bei 72x kommt der Farbunterschied etwas besser zur Geltung - A erscheint weiß, B weißgrau

★

A566

9^m.0

10^m.8

2.0"

66°

2016

Com

13^h22^m17.99^s / +26°31'10.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Wow, very fine, very delicate pair, ~2" and ~2-3 delta mag

STF1739

11^m.1

11^m.8

14.9"

126°

2017

CVn

13^h22^m33.24^s / +30°30'55.80"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very faint but surprisingly can see B direct, well separated one delta. WDS lists as uncertain but there is no parallax overlap by a wide margin, so it can be listed as not physical

HO259

7^m.7

12^m.7

10.0"

245°

2015

Com

13^h22^m34.15^s / +26°06'56.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

B is very faint, averted vision only, fairly wide sep. ~10-12" to west.

HO260

9^m.6

9^m.9

1.7"

89°

2017

CVn

13^h23^m32.82^s / +29°14'15.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Close pair, nicely split ~2", ~1 delta mag, light orange stars

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

★★

zeta UMa

STF1744, 79 UMa, Mizar

2^m.2

3^m.9

14.6"

154°

2019

UMa

13^h23^m55.42^s / +54°55'31.50"

STF1744, Mizar & Alcor

2^m.2

4^m.0

707.7"

72°

2017

SMR4

2^m.2

7^m.6

492.8"

102°

2017

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) - 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.
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

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

BUP150, alpha Vir, 67 Vir, Spica

1^m.0

12^m.0

152.5"

33°

2007

Vir

13^h25^m11.58^s / -11°09'40.40"

1^m.0

10^m.5

366.6"

61°

1999

René Merting

Drachhausen (Germany)

100mm (64x)

AC: bei 64x ist C ostnordöstlich vom gleißend hellen Stern Spica zu erkennen - C steht gerade so sichtbar am Rand des Strahlkranzes

A1609

9^m.5

8^m.8

0.3"

67°

2017

CVn

13^h25^m48.12^s / +44°29'38.30"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Notched elongation with the fainter end PA just south of east, very difficult, with seeing only. 44.24-year period, it is nearing periastron and won't appreciably widen, at the opposite PA, until the mid 2030s

★

BU237

8^m.5

10^m.6

3.1"

213°

2018

Com

13^h26^m53.35^s / +14°22'21.70"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Excellent pair, B visible with seeing as a very fine point, well separated ~4" from A, ~3 delta, very fine

STF1747

9^m.3

10^m.2

14.9"

345°

2015

CVn

13^h27^m45.73^s / +47°45'32.20"

Robert Zebahl Leipzig (Germany)	70mm (44x)	2020-04-20: Easy to separate. The primary component appeared slightly orange with a noticeably fainter companion.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Wide one delta. WDS claims physical but there is no parallax overlap

STF1746

7^m.7

10^m.7

22.8"

246°

2015

Vir

13^h28^m09.72^s / +09°27'40.10"

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201746.png

STT266

8^m.0

8^m.4

2.0"

358°

2018

Com

13^h28^m26.68^s / +15°42'30.50"

Mark McCarthy Fremont (California/USA)	203mm (333x)	~0.5 delta mag, ~2 separation, nice looking pair
Mark McCarthy Fremont (California/USA)	317mm (553x)	Close 2" near equal white. Period of 1954.11 years. Near its closest separation now (May 2017), will be ~4" by the year 2822.

STF1752

8^m.2

9^m.9

1.0"

107°

2017

UMa

13^h28^m49.82^s / +59°55'41.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange star perhaps a little elongated, tough.

STF1750, 72 Vir

6^m.1

10^m.7

30.1"

17°

2015

Vir

13^h30^m25.72^s / -06°28'13.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

72 Vir: Wide split, yellow-white A and ~10th mag B, 3 delta mag.

STT268 & H5 70 & GAT2, FK Com

STT268

7^m.7

13^m.0

19.1"

78°

2015

Com

13^h30^m52.21^s / +24°14'15.30"

H5 70

7^m.7

8^m.3

76.8"

256°

2018

H5 70

7^m.7

13^m.5

78.7"

27°

2015

GAT2

Ba-Bb

13^m.0

13^m.1

1.3"

42°

2015

Christopher Hay Seeheim (Germany)	15x45	AC: Binoculars with internal stabilisation, handheld. Wide split. Fairly well-matched pair with small delta-mag. Nicely framed by a straight line of three 6-mag stars, one of which is the double A567.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Very faint wide B, bluish. Averted vision best, and with seeing.

HLM5

10^m.1

10^m.9

6.1"

161°

2015

CVn

13^h31^m00.44^s / +36°26'27.70"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

White stars, well split ~6", about one delta. Surprised this was not discovered until 1901 by amateur British astronomer Edwin Holmes, who was a "seller of glass" and made his own 12-inch Newtonian. Apparently he was strongly opinionated and argued for the use of reflectors over refractors for their large aperture at low cost

STF1755

7^m.3

8^m.1

4.1"

133°

2018

CVn

13^h32^m21.99^s / +36°49'05.60"

Robert Zebahl Leipzig (Germany)	70mm (67x)	At 31x just separable, extremely tight. At 44x clearly separated, but still close, relatively dim pair with moderate difference in brightness. At 67x and 100x well separable. The primary component appeared slightly orange.
René Merting Drachhausen (Germany)	100mm (64x)	bei 64x ein extrem eng stehendes Paar - B im SO ist maximal eine halbe Größenklasse schwächer als A - beide spielen Braut in ihren reinweißen Kleidern
Mark McCarthy Fremont (California/USA)	317mm (277x)	Pretty orange and blue, 5-6", 2 delta mag. Nice.

VYS6, VW Com

11^m.4

11^m.3

2.6"

55°

2018

Com

13^h32^m44.59^s / +16°48'39.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

VW Com. Seen best with averted vision and when seeing stills. Close but pretty well split, ~2-3". Extremely faint reddish pair, PA NE.

★★

A567

6^m.2

9^m.7

1.5"

257°

2019

Com

13^h32^m48.21^s / +24°20'48.30"

Christopher Hay Seeheim (Germany)	150mm (96x)	At a position angle of roughly 265° I had the feeling something was going on; a kind of protusion of the primary, coming and going. 200x: yes, now a stellar condensation kept popping in and out of sight at the same position, just on the outside of the first ring, which itself was coming and going in not-so-perfect seeing. Upping the magnification to 240x and 300x didn't improve the view.
Mark McCarthy Fremont (California/USA)	317mm (553x)	very faint B, very close, ~1" when seeing stills, 3-4 delta magnitude. Surprised it is not so difficult. B looks like it doesn't have any light of its own and is illuminated by A.

STT269

AB-C

6^m.8

9^m.2

123.7"

332°

2015

CVn

13^h32^m51.02^s / +34°54'25.80"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Wide but pretty faint pair, 2 delta mag. Did not detect 0.3" AB

STT269

7^m.3

8^m.1

0.3"

222°

2019

CVn

13^h32^m51.02^s / +34°54'25.80"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Strong notch, good star images, not quite split. I saw it as a rod at 205x, and the notch increased in strength with each magnification step up. PA to SW. Physical with grade 2 orbit and 53.2-year period (having made nearly one revolution in my lifetime so far!), it is 0.297" now and is coming off apastron, it will rapidly close to undetectability by the late 2030s

STF1758

8^m.7

8^m.9

3.4"

290°

2019

CVn

13^h32^m51.51^s / +49°08'24.30"

Robert Zebahl Leipzig (Germany)	70mm (67x)	2020-04-20: Clearly split, still relatively tight pair with little difference in brightness. The components appear slightly different in color: slightly orange, yellowish.
Mark McCarthy Fremont (California/USA)	178mm (205x)	1 delta, well separated. WDS uncertain but there is definitely no parallax overlap, so these are not physical
Mark McCarthy Fremont (California/USA)	203mm (205x)	Nice near equal pair, slightly yellow, ~5"
Mark McCarthy Fremont (California/USA)	203mm (205x)	Nice near equal pair, slightly yellow, ~5"
Mark McCarthy Fremont (California/USA)	317mm (277x)	Evenly matched yellow-orange pair ~4". Nice

STF1756

9^m.9

10^m.4

14.7"

177°

2016

Com

13^h33^m19.04^s / +23°00'51.00"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Blue-white stars, half delta mag, very wide
Mark McCarthy Fremont (California/USA)	317mm (553x)	Wide white pair, 0.5 delta mag.

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201756.png

A1095

9^m.0

9^m.3

0.3"

288°

2016

CVn

13^h33^m33.77^s / +29°44'16.90"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Hairline split, >1 delta mag. 187-year period, it will make a slight movement to the north in my lifetime but will be closer to periastron

STF1759

9^m.9

11^m.2

10.4"

155°

2015

Com

13^h33^m44.39^s / +27°27'00.50"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint and wide B. Physical per WDS but my calculator shows there's no parallax overlap, 1 AU too far apart

STF1757

7^m.8

8^m.8

1.7"

143°

2018

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"

★

BU114

8^m.1

8^m.2

1.3"

173°

2018

Vir

13^h34^m17.72^s / -08°37'07.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Nice near equal, slightly yellow white stars, ~10th mag. In 80mm finder it is shown with another widely separated equal pair.

★

HJ1234

6^m.4

10^m.5

28.6"

9°

2008

CVn

13^h34^m21.87^s / +38°47'21.30"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

B a faint blue orb, looks like a planet reflecting A's light. Yellow A. Nice!

STF1760

8^m.8

9^m.1

8.7"

64°

2018

Com

13^h34^m23.81^s / +26°16'34.00"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Wide white stars, near equal
Mark McCarthy Fremont (California/USA)	317mm (553x)	Bright white, pretty wide separation, equal magnitude.

S650

8^m.2

9^m.0

57.2"

126°

2015

Vir

13^h34^m30.00^s / -13°26'05.50"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x komfortabel getrennt - Helligkeitsunterschied eine halbe Größenklasse- A wirkt grau, B ist weißbraun

BU933

9^m.0

9^m.7

2.8"

23°

2017

CVn

13^h34^m34.66^s / +33°08'08.70"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very fine pair, blue-white A, white B, ~3" ~2 delta

BU932

6^m.3

7^m.3

0.4"

67°

2019

Vir

13^h34^m40.48^s / -13°12'51.50"

Mark McCarthy

Fremont (California/USA)

317mm (170x)

Out of round with apodizing mask

KR42

10^m.4

10^m.6

3.7"

217°

2017

UMa

13^h35^m24.70^s / +59°54'58.70"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint near equal, nicely split ~4". Physical

AG190

9^m.6

9^m.8

2.6"

13°

2017

CVn

13^h35^m38.82^s / +49°39'21.70"

Robert Zebahl

Leipzig (Germany)

70mm (80x)

2020-04-20: Pretty faint double star. At 80x still very tight pair with little difference in brightness. Not very attractive.

POU3145

10^m.1

5.7"

200°

2015

Boo

13^h37^m02.85^s / +23°18'31.80"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Near equal wide white stars. WDS lists as physical, and I agree

★

25 CVn

STF1768

5^m.0

7^m.0

1.6"

93°

2019

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

369.5"

139°

2015

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"

★

STF1763

7^m.8

8^m.1

2.7"

39°

2017

Vir

13^h37^m35.30^s / -07°52'16.60"

7^m.8

12^m.3

138.9"

327°

2015

René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 64x zeigt sich in guten Momenten eine schöne 8 - bei 107x ein schönes enges, knapp getrenntes Paar zweier gleich heller Sterne
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: 81 Vir: near equal orange stars, ~3", 9th mag. Nice!

STF1770

6^m.9

8^m.2

1.8"

128°

2017

UMa

13^h37^m42.92^s / +50°42'53.50"

Sarah Gebauer Germany	100mm (200x)	bei 200x manchmal blickweise sichtbar, die zweite Komponente tauchte südöstlich hin und wieder auf, keine saubere Trennung
Mark McCarthy Fremont (California/USA)	317mm (443x)	Tight light orange pair, 2 delta mag, ~1".

STF1764

6^m.8

8^m.6

16.1"

31°

2018

Vir

13^h37^m44.01^s / +02°22'56.50"

Mark McCarthy Fremont (California/USA)	80mm (92x)	Extremely faint B flashes with averted vision only. Lower to horizon and in haze, so it was more difficult to see the faint star
Mark McCarthy Fremont (California/USA)	203mm (333x)	Orange and 2x fainter blue, wide. Another equal wide pair to the south.

STF1769

7^m.9

10^m.4

1.6"

45°

2015

CVn

13^h38^m01.95^s / +39°10'41.00"

7^m.9

9^m.3

56.2"

259°

2015

7^m.9

13^m.0

151.6"

188°

2002

9^m.3

13^m.0

142.9"

167°

2002

René Merting Drachhausen (Germany)	100mm (32x)	AC: bei 32x ein weit auseinander stehendes Pärchen - B im Westen ist eine Größenklasse schwächer als die weiße Komponente A und wirkt gegen A richtiggehend blaugrau
Mark McCarthy Fremont (California/USA)	203mm (333x)	AC: Wide separated blue stars, half delta mag. 2+1 system? 1 delta mag fainter star quite more widely separated. (Sextuple system. I missed the 1.6" AB, need to re-observe. Saw the AC pair only -- the fainter star noticed may be part of the system.)

BU612

6^m.3

6^m.5

0.1"

18°

2019

Boo

13^h39^m34.68^s / +10°44'46.70"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Lightest orange, notched elongation to snowman at best moments. Burnham discovered in 1878 with the Dearborn 18.5-inch, and in 1899 wrote: "It was very soon apparent from the measures that this was a binary system in rapid motion. In the twenty years covered by the measures, the companion has passed over an arc of 175-degrees. Glasenappâ€¦has computed an orbit from which he finds a period of 30.00 years....This represents the observations as well as could be desired, but evidently the arc was too short for any very accurate determination, and even now widely differing apparent orbits will satisfy the observed positions equally. It is probably that the measures of the next ten years will furnish sufficient data for an orbit which shall substantially correct." In the period since, there have been many measures, and a grade 1 Definitive orbit is established. WDS lists it as physical with a 22.46-year period, currently at 0.1 but will widen to 0.3" by 2030 -- I can hope for a clean split by then

STF1774

6^m.3

10^m.5

17.3"

135°

2015

UMa

13^h40^m23.35^s / +50°31'09.40"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Wide white and blue 3 delta mag.

★★

STF1772, 1 Boo

5^m.8

9^m.6

4.4"

134°

2017

Boo

13^h40^m40.50^s / +19°57'20.40"

5^m.8

12^m.2

87.5"

26°

2015

5^m.8

7^m.4

208.4"

1°

2010

Christopher Hay Seeheim (Germany)	7x50	AD: On tripod. Wide split. Component D blueish. Fine in 7.3° field together with S 656. A physical double at a distance to us of 328 light years.
Christopher Hay Seeheim (Germany)	15x60	AD: On tripod. Very wide split. Component A cream-white, D pale blue.
Robert Zebahl Leipzig (Germany)	70mm (22x)	AD: 2020-04-24: Very widely split with clearly visible difference in brightness. The primary component appeared white-yellowish, the companion pale orange.
Christopher Hay Seeheim (Germany)	80mm (63x)	AB: B pops in and out of view as a very fine pinprick of light reasonably well set off from A. No success at 50x.
Christopher Hay Seeheim (Germany)	150mm (96x)	AB: Well split. Remarkably easy considering the 4-mag difference in brightness. A seems dusky yellow. B perhaps bluish, but hard to determine. 9-mag star a few arcminutes to the north makes the view even more pleasing. According to Stelledoppie AB is a physical double.
Mark McCarthy Fremont (California/USA)	203mm (333x)	AB: 1 Boo. Odd colors. Blue-white to greenish stars, wide, about 3 delta mag. AC is the very faint star well separated at nearly a right angle PA from the AB pair
Karsten Kopp Köln (Germany)	600mm (180x)	AB: Im CLT bei 180 x kein Problem. Der Reiz hier macht den größeren Helligkeitsunterschied von knapp 4 mag aus. Auch die Farben, der hellere erstrahlt eher weiß und der schwächere schwach rotbraun, sind schön anzusehen.

Berthold Fuchs

Wiesbaden (Germany)

130mm

AB: difficult DS

../projects/double-stars/berthold-fuchs/photographs/STF%201772.jpg

STF1773

9^m.9

10^m.0

30.6"

209°

2017

Boo

13^h41^m38.19^s / +07°36'21.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Wide near equal, part of a triple system forming a triangle of near equal stars which are not physical

STF1776

9^m.4

7.3"

19°

2015

CVn

13^h41^m47.70^s / +46°13'11.20"

Mark McCarthy Fremont (California/USA)	203mm (205x)	Near equal white stars, wide
Mark McCarthy Fremont (California/USA)	317mm (277x)	Near equal white, well split

★★

STF1777, 84 Vir

5^m.5

8^m.3

2.7"

227°

2015

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.

STF1775

7^m.2

10^m.1

27.6"

335°

2015

Vir

13^h43^m30.35^s / -04°16'28.10"

Mark McCarthy

Fremont (California/USA)

317mm (340x)

a pretty pairing of a bright orange A and a faint bluish B widely separated.

STF1779

9^m.3

10^m.4

3.8"

145°

2015

Boo

13^h44^m33.98^s / +23°40'06.00"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

~2 delta mag, wide, ~4"

STF1782

8^m.0

9^m.8

30.4"

185°

2018

Boo

13^h45^m06.87^s / +18°22'04.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Wide 1 delta. Physical in WDS and my calculator agrees

BU115

7^m.5

13^m.2

107.3"

169°

2015

Boo

13^h45^m20.87^s / +09°03'28.60"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Slightly orange and very wide separated, much fainter bluish star just visible. Did not notice AB 1.6" 10.4 mag.

Winnecke 5, WNC5

10^m.2

10^m.3

4.0"

164°

2017

Vir

13^h45^m32.62^s / -03°00'59.00"

René Merting

Drachhausen (Germany)

320mm (72x)

bei 72x sehe ich zwei kleine Kullerchen, die sich noch ganz knapp berühren und sich in guten Momenten getrennt zeigen - bei 144x ist die Trennung dann eindeutiger - beide Komponenten sind gleich hell

86 Vir

BU935

5^m.7

8^m.5

1.0"

304°

2001

Vir

13^h45^m56.33^s / -12°25'35.60"

STF1780

5^m.7

11^m.9

27.3"

163°

2000

STF1780

11^m.9

13^m.1

2.4"

272°

1958

Mark McCarthy Fremont (California/USA)	317mm (340x)	STF1780 (AC): 86 Virginis.brighter A and very faint, almost averted vision B widely separated.
Mark McCarthy Fremont (California/USA)	317mm (553x)	BU935 (AB): 86 Vir: Pretty orange star but @ 553x seeing wont allow split of 3 delta mag, 1.2" B. 27" away is equal 11th mag CD pair which I see as a grey smudge

STF1781, HT Vir

7^m.9

8^m.1

1.0"

198°

2019

Vir

13^h46^m06.75^s / +05°06'56.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

White A and slightly yellow B, ~2", half delta mag

LDS3101

6^m.4

10^m.2

488.5"

105°

2015

Vir

13^h46^m57.12^s / +06°21'01.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Light yellow A and very much fainter B, 4-5 delta mag., B is just detectable at this aperture Well separated.

★

S654 & SHY633

S654

5^m.6

8^m.9

71.3"

239°

2018

CVn

13^h46^m59.77^s / +38°32'33.70"

SHY633

5^m.6

8^m.9

999.9"

296°

2002

Christopher Hay Seeheim (Germany)	7x42	AB: With handheld 7x42 binoculars I cannot separate B from A. With handheld 10x42 binoculars with internal stabilisation, B emerges in fleeting moments from the glare of A, wide. Yellow-orange hue of A that I had already noticed with 7x42 binoculars becomes clearer with 10x42. With stabilised 20x60 binoculars I can hold B constantly, but B is far more difficult than component C (AC = Shaya 633) despite B and C having practically identical brightnesses. AC: With handheld 7x42 binoculars component C is clear and very wide from A. A seems yellow-orange. Not visually exciting, it is nonetheless pleasurable to contemplate that this is in fact a physical pair travelling together in space, 317 light years distant from us. SHY = E.J. Shaya, R. Olling, 2011: Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue. Component A is HIP 67250, C is 67041. AB is also physical, hence ABC is a triple system.
René Merting Drachhausen (Germany)	100mm (32x)	S654 (AB): bei 32x ein weit getrenntes Pärchen - B im Südwesten ist deutlich schwächer und farblos ggü. der weiß strahlenden Komponente A
Mark McCarthy Fremont (California/USA)	317mm (277x)	S654 (AB): Striking yellow-orange and blue-green fainter B.

STF1785

7^m.4

8^m.2

2.8"

190°

2019

Boo

13^h49^m04.00^s / +26°58'47.70"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Slightly orange-tinged white stars, near equal, well separated
Karsten Kopp Köln (Germany)	600mm (180x)	Im CLT bei 180 x Vergrößerung gut zu trennen. Leichter Helligkeitsunterschied und beider Sterne erscheinen gelborange.

STF1786

8^m.9

10^m.3

11.0"

22°

2015

CVn

13^h49^m38.98^s / +34°59'18.10"

Robert Zebahl Leipzig (Germany)	70mm (44x)	2020-04-20: Nicely separated at an attractive distance and with a clear difference in brightness. The components appeared pale orange and greyish.
Mark McCarthy Fremont (California/USA)	203mm (205x)	~1 delta mag, wide >10", white stars. Not physical

★★★

S656

6^m.9

7^m.4

86.2"

209°

2018

Boo

13^h50^m23.51^s / +21°16'35.80"

Christopher Hay Seeheim (Germany)	7x50	On tripod. Well split. A compact pair directly next to orangish-yellow 6 Boo in a remarkably attractive 7.3° FOV together with widely separated 1 Boo (STF 1772 AD) two degrees southwest plus Eta and Tau Boo about three degrees south. A physical double at a distance to us of 345 light years. This means that South 656 is not just close to 1 Boo AD in our perspective but also actually in space, making the two pairs one of the finest physical double-doubles in the sky for 7x binoculars.
Robert Zebahl Leipzig (Germany)	8x40	2020-04-05: Wide, medium bright pair. Primary component appeared slightly orange, the companion greyish. The double star is in close vicinity to the star 6 Boo, which shines in a pale orange.
Christopher Hay Seeheim (Germany)	15x60	On tripod. Wide split. Primary orangish. Well-matched pair, very striking. Nicely accentuated by yellowish 6 Boo a few arc-minutes to the west.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-24: Widely separated with little difference in brightness. Both components appeared slightly yellowish. Standing close to 6 Boo, which also shines in a slight yellow.
Mark McCarthy Fremont (California/USA)	178mm (205x)	Wide, white, half delta. WDS says it's physical but I calculate no parallax overlap and the two are too far apart to be gravitationally bound

BU613

Ba-Bb

10^m.9

0.8"

149°

2010

CVn

13^h51^m21.62^s / +34°41'03.90"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very fine. Suspected at 205x but needed the larger scale at 333x. Clean split, near equal faint blue stars. A third wider star same mag and color further out (this is BU 613 BC, 10.34/10.68 45.9")

A568

10^m.2

11^m.2

2.6"

321°

2017

Boo

13^h52^m27.03^s / +25°44'27.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

B is faint but easily detected, nice close pair

★

HJ1244

6^m.9

10^m.8

6.9"

130°

2015

CVn

13^h53^m20.79^s / +42°11'05.30"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Wow! Very faint B but can hold it direct vision with the seeing. Well separated from and orange-yellow A.

STF1789

8^m.6

9^m.0

6.7"

328°

2015

CVn

13^h54^m05.19^s / +32°49'35.20"

Robert Zebahl Leipzig (Germany)	70mm (31x)	2020-04-20: At 22x clearly visible as figure '8' and almost separated. At 31x fine separation of the still close pair. A slight difference in brightness and color is visible: white-yellowish, yellowish-orange.
Mark McCarthy Fremont (California/USA)	317mm (277x)	Pretty equal magnitude white, well separated.

Berthold Fuchs

Wiesbaden (Germany)

130mm

difficult DS

../projects/double-stars/berthold-fuchs/photographs/STF%201789.png

SHJ169, eta Boo

2^m.7

10^m.0

114.0"

85°

2016

Boo

13^h54^m41.07^s / +18°23'51.80"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Muphrid. Very wide faint B to bright white A. Not physical

STF1887

9^m.2

11^m.2

3.3"

226°

2013

UMi

13^h54^m57.46^s / +87°23'44.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Izar. A yellow, messy with seeing. B nice light blue and clean.

★

STF1788

6^m.7

7^m.3

3.7"

101°

2019

Vir

13^h54^m58.20^s / -08°03'31.90"

Robert Zebahl Leipzig (Germany)	70mm (47x)	Very nice view! Pretty tight together with a moderate difference in brightness.
René Merting Drachhausen (Germany)	100mm (64x)	bei 107x zeigt sich ein schönes, knapp getrenntes Pärchen - B im Osten ist nur knapp schwächer als A - Komponente A ist weiß, B ist grau, wirkt aber auch leicht gelb gefärbt - zurück auf 64x kann ich die beiden Sterne auch schon knapp getrennt erkennen
Mark McCarthy Fremont (California/USA)	317mm (340x)	bright pair of near equal magnitude, both yellow-while color.

STF1791

9^m.4

10^m.7

21.0"

159°

2016

Boo

13^h56^m49.22^s / +14°25'58.60"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint, wide, 1 delta. Not physical

BU937

9^m.0

9^m.4

1.1"

137°

2017

CVn

13^h57^m06.41^s / +34°26'04.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Nice pair, close ~1", white, about half delta mag

BU30

8^m.8

11^m.8

8.0"

199°

2015

Boo

13^h58^m07.43^s / +19°27'29.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

B seen with averted vision, wide

STF1793

7^m.5

8^m.4

4.8"

243°

2019

Boo

13^h59^m05.25^s / +25°48'57.60"

René Merting Drachhausen (Germany)	100mm (64x)	bei 32x kleben beide Komponenten noch aneinander - bei 64x knapp und bei 107x dann gut getrennt - die B-Komponente westlich ist gut eine Größenklasse schwächer
Mark McCarthy Fremont (California/USA)	203mm (333x)	White stars, widely separated, ~1.5 delta mag. Nice pair
Karsten Kopp Köln (Germany)	600mm (180x)	Im CLT bei 180 x kein Problem. Der schwächere Stern leuchtet bläulich und der hellere eher gelblich weiß.

Berthold Fuchs

Wiesbaden (Germany)

130mm

close DS

../projects/double-stars/berthold-fuchs/photographs/STF%201793.png

STF1794

9^m.5

9^m.7

2.0"

126°

2016

Boo

13^h59^m48.26^s / +19°52'57.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

~1 delta mag, well separated ~2", nice pair

STF1796

9^m.8

10^m.6

2.5"

190°

2018

CVn

14^h00^m24.11^s / +36°58'09.30"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Nice white and blue, ~1 delta, ~2-3"

SHJ171, tau Vir, 93 Vir

4^m.2

9^m.4

82.4"

289°

2017

Vir

14^h01^m38.78^s / +01°32'40.50"

René Merting

Drachhausen (Germany)

18x70

Komponente B ist mit komfortablem Abstand nordwestlich von A erkennbar - A ist reinweiß, B ist ein farbloser Punkt

A1097 & STF1800

A1097

9^m.1

8^m.2

0.4"

259°

2016

UMa

14^h02^m00.60^s / +57°13'28.60"

STF1800

AB-C

7^m.8

10^m.4

28.4"

20°

2015

Mark McCarthy Fremont (California/USA)	317mm (553x)	A1097 (AB): Hair-split at best moments, half delta mag, <0.8". A fainter star likely in the system about 30" distant -- this is STF 1800 AB-C.
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF1800 (AB-C): Faint star ~30" from A1097

A2064

9^m.6

11^m.0

1.1"

177°

2016

Boo

14^h03^m24.63^s / +17°40'00.10"

Mark McCarthy

Fremont (California/USA)

203mm (533x)

Elongated at 333x, split with a lot of smearing of the image due to poor transparency with 533x. Tough but worth the effort

BGH50

7^m.0

8^m.9

97.0"

32°

2015

Boo

14^h04^m45.95^s / +25°49'03.90"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Very wide 1 delta mag. WDS claims physical. My calculator shows there is no parallax overlap by fractions of parsecs -- with should be enough to exclude them from being physical, but it's close. This should be listed as uncertain
Mark McCarthy Fremont (California/USA)	203mm (205x)	13x80mm finder split. Wide pair, 2 delta mag, dull white. Viewed 8" 205x, no apparent other doubling

STT274

7^m.1

10^m.5

12.9"

51°

2018

CVn

14^h06^m41.61^s / +34°46'42.80"

Robert Zebahl Leipzig (Germany)	70mm (133x)	2020-04-20: At 100x and 133x no signs of the faint companion visible.
Mark McCarthy Fremont (California/USA)	203mm (205x)	Bright white and ~3 delta mag B, wide, attractive. Not physical

STT276

8^m.9

9^m.4

0.4"

207°

2016

Boo

14^h08^m11.84^s / +36°44'56.60"

AB-C

8^m.5

10^m.6

9.5"

72°

2015

Mark McCarthy Fremont (California/USA)	203mm (205x)	AB-C: White and ~3 delta mag B, wide (need to re-observe with larger aperture, AB is 0.4")
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Marginal elongation to rod
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB-C: 1 delta mag, ~5"

STF1804

8^m.2

9^m.3

4.7"

13°

2019

Boo

14^h08^m15.53^s / +21°11'34.90"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Easy ~1.5 delta mag, wide pair, white stars

A2065

9^m.5

11^m.1

1.6"

342°

2015

Boo

14^h08^m19.11^s / +16°43'32.90"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Very fine pair, white A, 2 delta, very close but nice split. WDS lists as uncertain but the EDR3 data show there is no parallax overlap (by a lot), so these are a comoving but not gravitationally bound pair

STT275

7^m.3

10^m.1

5.0"

354°

2015

Vir

14^h09^m11.21^s / +07°23'05.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange star with very faint B, 3-4 delta mag, wide ~10". Nice!

A1098

9^m.2

11^m.2

3.8"

282°

2017

Boo

14^h09^m49.14^s / +08°22'04.90"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Very light yellow-orange A, 2 delta, well separated B. Not physical (no parallax overlap and proper motions are divergent)

STF1805

9^m.0

9^m.2

4.9"

34°

2018

Vir

14^h09^m57.24^s / +04°00'56.40"

Berthold Fuchs

Wiesbaden (Germany)

130mm

close DS

../projects/double-stars/berthold-fuchs/photographs/STF%201805.png

STF1808

8^m.8

9^m.6

2.5"

82°

2019

Boo

14^h10^m07.76^s / +26°35'58.10"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

~1.5 delta, wide white stars

HDS1989

Aa-Ab

8^m.5

10^m.9

0.4"

335°

2018

Boo

14^h10^m55.76^s / +15°12'55.70"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Light orange, not round at all powers, it is misshapen with a small lump on one side, disks will not resolve. EDR3 does not show any such close companion! Maybe my "not round" is confirmation bias?

STT277 & STF1812

STT277

8^m.7

8^m.6

0.2"

64°

2009

Boo

14^h12^m26.68^s / +28°43'02.30"

STF1812

AB-C

7^m.9

9^m.4

14.1"

108°

2015

STF1812

AB-D

7^m.9

12^m.1

72.6"

153°

2015

René Merting Drachhausen (Germany)	18x70	STF1812 (AB-C): mit etwas Geduld zeigt sich C sehr schwach und knapp abgesetzt östlich von AB - nur mit hoher Konzentration, aber machbar
René Merting Drachhausen (Germany)	100mm (20x)	STF1812 (AB-C): bei 20x ist die C-Komponente östlich knapp getrennt von AB gerade so erkennbar - bei 32x dann schön getrenntes Pärchen, C-Komponente deutlich schwächer, vielleicht 2 mag weniger
Mark McCarthy Fremont (California/USA)	203mm (205x)	STF1812 (AB-C): A 2+1 system with AB-D. Main pair 2.5 delta mag, pretty wide. The third, fainter pair about 4x the other separation.

STF1820

9^m.1

9^m.4

2.8"

123°

2019

UMa

14^h13^m00.76^s / +55°19'31.10"

René Merting

Drachhausen (Germany)

320mm (144x)

bei 72x ist ein Stäbchen mit einer angedeuteten Einschnürung erkennen - bei 144x sind beide Komponenten getrennt voneinander sichtbar - beide sind gleich hell

STF1813

8^m.4

8^m.6

4.6"

193°

2019

Vir

14^h13^m24.23^s / +05°24'03.20"

Berthold Fuchs

Wiesbaden (Germany)

130mm

close DS

../projects/double-stars/berthold-fuchs/photographs/STF%201813.png

★

BU224

8^m.9

9^m.3

0.6"

101°

2016

Boo

14^h13^m26.94^s / +12°34'26.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Hairline split with seeing, light yellow-white stars, noticeable mag difference. Snowman when seeing is not stable

★★

STF1821, 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
Karsten Kopp Köln (Germany)	600mm (180x)	Im CLT leicht zu trennen. Beider Sterne erscheinen weißlich.

★

STT279

6^m.8

9^m.1

2.2"

257°

2018

Boo

14^h13^m49.46^s / +11°59'51.90"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Fine pair, white A and slightly peach color B, ~2" separated and ~3 delta mag
Mark McCarthy Fremont (California/USA)	317mm (553x)	Very pretty orange and blue, 2-3", PA SW 2 delta mag

A1100

8^m.4

9^m.3

0.2"

173°

2011

Boo

14^h13^m50.60^s / +08°58'51.10"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Subtle notched elongation. EDR3 does not show any close companion

★

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

COU60

10^m.7

11^m.7

7.3"

282°

2015

Boo

14^h13^m58.52^s / +17°12'33.60"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

B seen with averted vision only as a flash, ~5" separation

HEI530

9^m.7

10^m.2

0.5"

353°

2016

Boo

14^h14^m07.87^s / +10°55'46.70"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Very brief split of unequal white stars, with seeing only. EDR3 does not show any close companion

STF1818

9^m.0

10^m.2

5.4"

330°

2018

Boo

14^h14^m16.33^s / +33°55'41.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

~1 delta mag white, wide, ~5"

KUI66, 15 Boo

5^m.4

8^m.4

0.8"

111°

2015

Boo

14^h14^m50.85^s / +10°06'02.20"

Mark McCarthy Fremont (California/USA)	178mm (445x)	Light orange-yellow A, when it settles with seeing there is a persistent very faint point within the shifting diffraction, <1", large delta mag. There are 36 measures in the WDS since 1936 discovery, but the nature of the pair is uncertain because there is no parallax data for the secondary star
Mark McCarthy Fremont (California/USA)	203mm (333x)	Light orange and two possible pairs, both very faint on the edge of detection. One closer but still visible, very wide.

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.

★★

A1101

9^m.7

10^m.3

0.3"

224°

2018

Boo

14^h15^m50.57^s / +10°17'59.30"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

I stared for a long time and had brief instants of an elongation or bump, and even a tentative split of a star. Sketched the orientation will check the PA later [I think I have it. My orientation on the sketch is in the correct position as in relation to the AB-C & AB-D pairs.]

★★

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

138.0"

245°

2016

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.
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°

2017

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

HWE32

9^m.9

10^m.6

4.6"

194°

2018

Boo

14^h16^m15.42^s / +23°21'38.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Surprisingly easy, two delta and fairly wide

★

STF1825

6^m.5

8^m.4

4.2"

154°

2019

Boo

14^h16^m32.84^s / +20°07'18.70"

Mark McCarthy Fremont (California/USA)	80mm (94x)	Very fine split, >2 delta mag, white A and blue B, nice
Mark McCarthy Fremont (California/USA)	203mm (333x)	Cream white A and light blue B, wide ~5", ~2 delta mag
Mark McCarthy Fremont (California/USA)	317mm (277x)	White and orange, 3 delta mag, well split.

BU1441

10^m.1

11^m.6

3.6"

80°

2017

Boo

14^h16^m35.81^s / +23°28'36.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Fine if faint pair, wide ~4", ~2 delta mag, bluish color due to their faintness

STF1828

10^m.4

10^m.8

2.1"

159°

2018

Boo

14^h16^m58.35^s / +24°11'33.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very nice faint near equal pair, a bit hazy until seeing stills then very fine bluish points resolve

ENG51, 18 Boo

5^m.4

10^m.8

164.0"

219°

2015

Boo

14^h19^m16.28^s / +13°00'15.50"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Super wide faint companion, not physical

STF1834

8^m.1

8^m.3

1.6"

104°

2018

Boo

14^h20^m17.60^s / +48°30'25.10"

Robert Zebahl

Leipzig (Germany)

120mm (150x)

At 108x elongated, at 150x barely split with similarly bright components.

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!

HO541

11^m.0

11^m.9

2.6"

89°

2017

Boo

14^h20^m41.13^s / +12°09'59.60"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

B just visible with direct vision, very fine split ~2"

★

COU482

9^m.9

10^m.0

0.6"

121°

2017

Boo

14^h21^m20.69^s / +30°50'07.10"

Mark McCarthy

Fremont (California/USA)

508mm (445x)

! Excellent white pair, brief splits with seeing at 205x, easy steady split with six, slightly unequal. Uncertain in WDS, and no parallax data in EDR3

★★

STF1835 & BU1111

STF1835

A-BC

5^m.0

6^m.8

6.2"

196°

2018

Boo

14^h23^m22.74^s / +08°26'47.90"

BU1111

7^m.4

7^m.7

0.3"

16°

2018

René Merting Drachhausen (Germany)	100mm (64x)	STF1835 (A-BC): bei 32x erscheint der Stern leicht unrund, verschmiert - bei 107x präsentiert sich BC gut getrennt im Süden von A - Helligkeitsunterschied eine Größenklasse (1.75 mag laut Stelle Doppie) - bei 64x sind beide Sterne auch getrennt erkennbar, BC strahlt warmweiß
Robert Zebahl Leipzig (Germany)	102mm (62x)	STF1835 (A-BC): At 28x barely split with visible difference in brightness. At 62x easy to separate. The colors seemed similar.
Mark McCarthy Fremont (California/USA)	317mm (277x)	STF1835 (A-BC): In a line of three stars, white and slightly red B. Wide, ~6", 2 delta mag. Did not detect BC 0.3"
Mark McCarthy Fremont (California/USA)	508mm (1067x)	BU1111 (BC): Short period pair, it is a component of STF 1835. I get a nothed near equal elongation with a clear direction in relation to the A star. Very cool
Karsten Kopp Köln (Germany)	600mm (180x)	STF1835 (A-BC): Doppelstern konnte im CLT gut getrennt werden. Helligkeitsunterschied ist merklich, aber nicht extrem. Der hellere erscheint eher weißlich und der kleinere eher bläulich. Der Farbunterschied ist aber minimal.

Berthold Fuchs

Wiesbaden (Germany)

130mm

STF1835 (A-BC): close DS

../projects/double-stars/berthold-fuchs/photographs/STF%201835.jpg

STF1838

7^m.5

7^m.7

9.4"

335°

2020

Boo

14^h24^m05.76^s / +11°14'49.10"

Robert Zebahl Leipzig (Germany)	70mm (44x)	2020-04-24: At 22x small, fine and remarkable double star with small difference in brightness, at 44x with visible color difference: orange & white-bluish.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x sind flüchtig zwei kleine sich berührende Perlchen zu erkennen - etwas genauer betrachtet, können beide Sterne getrennt gesehen werden - B im NW ist nur knapp schwächer - ein schönes Pärchen ohne Konkurrenz im Umfeld
Mark McCarthy Fremont (California/USA)	203mm (205x)	White stars, very slight mag difference, wide

Berthold Fuchs

Wiesbaden (Germany)

130mm

easy DS

../projects/double-stars/berthold-fuchs/photographs/STF%201838.jpg

STF1843

7^m.7

9^m.2

19.8"

186°

2018

Boo

14^h24^m38.91^s / +47°49'50.00"

7^m.7

9^m.7

100.8"

63°

2018

Robert Zebahl Leipzig (Germany)	102mm (28x)	2021-05-16: All three components easily visible. At first glance, they form an approximately right-angled triangle. The primary component appeared in a pale yellow with two clearly fainter companions. The pair AC appeared at about 5 times the distance compared to the pair AB, which was still quite close.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Pretty wide, 3 delta mag.

STT580, the Boo

4^m.1

11^m.5

69.7"

182°

2015

Boo

14^h25^m11.79^s / +51°51'02.70"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

23 Boo, Theta Boo. Very bright A with very faint B, wide.

BU1442

9^m.9

10^m.2

45.2"

74°

2017

Boo

14^h25^m43.56^s / +23°36'59.90"

9^m.9

9^m.7

75.2"

61°

2017

9^m.9

13^m.1

250.0"

285°

2016

9^m.7

14^m.7

56.1"

182°

2017

René Merting Drachhausen (Germany)	10x50	das Dreifachsystem ist auszumachen als leicht länglicher Nebelstrich - in guten Momenten ist indirekt eine Zweiteilung erkennbar, vermutlich eine Trennung A-BC
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x sind alle drei Komponenten direkt erkennbar - die mittlere Komponente B steht leicht südlich versetzt und scheint der schwächste von den Dreien zu sein - bei 32x sind alle drei Sterne gut getrennt und C steht näher zu B als A - Farbe ist nicht wirklich feststellbar, aber der C strahlt ein wenig klarer (nicht heller), A und B wirken etwas dumpfer, fast so als würden sie zum Orange tendieren
Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: 5 stars in the system, but only 3 are bright enough for me to see with 7-inch, they form an arc (like a jumping dolphin) of near equal stars. WDS says AB are physical and my calculator agrees, which is a surprise given the very wide separation -- they are relatively close stars so appear wide
René Merting Drachhausen (Germany)	320mm (45x)	bei 45x strahlen alle drei Sterne kupfern bzw. dunkel - bei 70x haben alle die gleiche Helligkeit, der östliche Stern strahlt nicht heller aber weißer - die Sterne wirken im Vergleich zu den übrigen Sternen im Gesichtsfeld, als hätten sie Farbe

★

HO542

10^m.3

0.9"

35°

2017

Boo

14^h27^m33.26^s / +20°37'07.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint near equal, very finely split with seeing, bluish stars

STF1848

8^m.7

11^m.7

3.1"

356°

2019

Boo

14^h27^m45.30^s / +32°57'02.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

White and very faint B, which is drawn out with foveal coaxing. ~3 delta and ~3". Nice

HO543

9^m.6

9^m.7

4.6"

237°

2019

Boo

14^h27^m54.80^s / +21°22'33.90"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

White stars, near equal, wide ~5"

★

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

HU1268

9^m.8

9^m.9

0.4"

338°

2019

Boo

14^h29^m32.75^s / +36°12'26.00"

Mark McCarthy

Fremont (California/USA)

203mm (533x)

Notched elongation, white, near equal

STF1854

6^m.0

10^m.6

26.1"

256°

2015

Boo

14^h29^m49.66^s / +31°47'28.20"

Mark McCarthy Fremont (California/USA)	80mm (94x)	B is widely separated but with averted vision
Mark McCarthy Fremont (California/USA)	178mm (205x)	White and wide faint B, 3 delta. WDS claims physical but there is no overlap in their parallax range, with a gap of a fraction of a parsec, still enough to keep them from being gravitationally bound
Mark McCarthy Fremont (California/USA)	317mm (553x)	Bright blue-white A, faint pair to the west, wide

BRT1281

11^m.0

11^m.9

5.0"

277°

2015

Boo

14^h30^m08.36^s / +10°27'52.20"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Faint but clearly seen, bluish, about ~6" separation, equal mag. Not physical

COU97

9^m.1

9^m.8

0.3"

244°

2008

Boo

14^h30^m31.59^s / +20°55'15.50"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Notched elongation, near equal light orange stars. Spectral class K0, so the color fits. WDS is uncertain as to binarity, and unfortunately Gaia lacks any data on the companion star

BU1443

6^m.2

10^m.6

55.7"

195°

2017

Vir

14^h30^m45.39^s / +04°46'20.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Light yellow-orange A and much fainter blue B, wide separation.

HU904

10^m.0

11^m.7

1.9"

172°

2015

Boo

14^h31^m09.93^s / +34°25'32.70"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

B very close and faint, can see with foveal coaxing only, can't hold it directly

BU117

8^m.4

9^m.4

1.4"

74°

2017

Lib

14^h31^m19.74^s / -15°38'19.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Well split, 0.5 delta mag, ~1.5"

HJ2728, rho Boo

3^m.6

11^m.5

33.8"

343°

2017

Boo

14^h31^m49.86^s / +30°22'16.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Wide blue faint B to bright orange A. PA to west, 4-5 delta mag.

STT283

A-BC

8^m.1

12^m.6

5.9"

130°

2017

Boo

14^h32^m30.86^s / +49°11'02.60"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Faint and slightly reddish B, maybe due to faintness, bright white A, well separated. HU 57 BC not tried for, 12.62/11.77 1.2". WDS says A-BC is physical, however there is no parallax overlap -- it's not binary

HU140

9^m.5

10^m.1

1.4"

196°

2016

Lib

14^h32^m32.68^s / -13°00'14.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Seeing not quite good enough, need more darkness, and it's near Jupiter. I can see an elongated smear, averted vision brightens but does not split.

STF1858

8^m.1

9^m.0

3.0"

38°

2019

Boo

14^h33^m36.45^s / +35°35'08.00"

8^m.1

14^m.3

19.7"

335°

2013

8^m.1

14^m.7

36.6"

322°

2013

René Merting Drachhausen (Germany)	100mm (142x)	AB: bei 64x ein extrem dicht stehendes Pärchen, Trennung fast greifbar - bei 142x stehen die Sterne noch immer sehr eng, die Trennung ist nun aber eindeutig - Komponente B im NO ist etwas schwächer - beide Sterne leicht gelblich, hin und wieder mit Farbkontrast in Richtung orange
Uwe Pilz Leipzig (Germany)	105mm (288x)	AB: nicht getrennt
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: Nice white pair, ~1.5 delta mag, wide ~5". (Check the orbit on this one! Oh to be alive in the 3530s to see B whip around A)
Mark McCarthy Fremont (California/USA)	317mm (553x)	AC: 13th magnitude, a wide pair? Seen with averted vision, comes and goes with seeing

COU1586

6^m.8

10^m.3

1.8"

143°

2015

Boo

14^h33^m44.62^s / +43°00'28.10"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Well seen at 205x, very bright white A and faint B hanging close to it, separated. WDS says physical and I'd agree, it's s strong possibility of binarity

AGC6

9^m.8

10^m.3

0.8"

133°

2015

Boo

14^h33^m55.72^s / +29°49'19.10"

Mark McCarthy

Fremont (California/USA)

508mm (445x)

Small scale split with 205x, easy split with 445x. Near Arcturus, so in wide field it looks like debris from the bright star. No parallax data for the A star in EDR3

COU1587

11^m.4

11^m.7

0.8"

27°

2010

Boo

14^h34^m02.12^s / +45°00'12.20"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Elongation at 205x since its faint, more magnification lengthens the elongation but it becomes more of a smear, transparency seems to be hindering resolution. Uncertain in WDS, unfortunately no parallax data in EDR3

STT582, sig Boo

4^m.5

10^m.7

214.5"

85°

2015

Boo

14^h34^m40.81^s / +29°44'42.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very wide blue to east?

HEI780

10^m.5

10^m.9

1.8"

63°

2018

Boo

14^h36^m14.78^s / +08°24'36.50"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Finely split equal stars ~2", white

STF3087

10^m.6

10^m.7

2.3"

222°

2018

Boo

14^h36^m15.39^s / +19°24'22.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Nice pair ~4" separation, hardens with seeing to points, bluish. [Missed ITF 140 AC and BC, 10.6 mag and 4" and 7.6"]

STF1861

9^m.7

10^m.3

13.9"

174°

2017

Boo

14^h36^m42.39^s / +12°10'10.50"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Wide white stars, ~1 delta mag

A347

8^m.7

8^m.4

0.5"

236°

2018

Boo

14^h36^m56.24^s / +48°13'17.90"

Mark McCarthy

Fremont (California/USA)

508mm (445x)

Near equal white stars, suspected double at 205x, easy split at 445x. Binary with 236.4-year period

HEI67

10^m.3

11^m.4

1.1"

112°

1991

Boo

14^h37^m44.36^s / +14°18'05.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very faint elongation, sharpens and splits with seeing, ~1", equal pair

STF1862

9^m.3

10^m.5

14.9"

125°

2017

Boo

14^h37^m49.07^s / +14°54'09.60"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very wide white stars, ~1 delta mag

★

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

HWE34

10^m.4

10^m.6

2.6"

12°

2017

Boo

14^h40^m18.22^s / +12°05'34.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Nice pair well split ~3", equal, white

A1622

8^m.9

10^m.6

1.9"

254°

2019

Boo

14^h40^m30.40^s / +46°32'32.80"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

White A and dull-to-reddish B, well separated around 2" and 2 delta mag. Uncertain in WDS, and the EDR3 data back that up with good parallax overlap and only 226 AU separation

STF1864, pi 1 Boo

4^m.9

5^m.8

5.4"

113°

2019

Boo

14^h40^m43.56^s / +16°25'05.90"

Robert Zebahl Leipzig (Germany)	70mm (31x)	2020-04-24: At 22x immediately visible as figure '8' with visible difference in brightness. Beside omicron Boo there are no other brighter stars in the nearer surroundings. At 31x cleanly split, but still close together with noticeable difference in brightness. Both components appear white. Beautiful sight. At 57x very nice with a slightly different color impression: white & dark yellow.
Mark McCarthy Fremont (California/USA)	80mm (94x)	White stars, 1 delta mag, nicely split
René Merting Drachhausen (Germany)	100mm (64x)	bei 32x eine 8, bei 64x dann knappe Trennung des Doppelsterns - Komponente B östlich ist nur leicht schwächer und erscheint mit einem zarten Stich ins Gelbe
Mark McCarthy Fremont (California/USA)	203mm (333x)	Pi 1 Boo. Very bright, ~1 delta mag, off white stars

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

STF1867

8^m.4

8^m.8

0.7"

355°

2017

Boo

14^h40^m44.21^s / +31°17'23.50"

Mark McCarthy Fremont (California/USA)	203mm (533x)	Hairline split best moments, noticeable mag difference
Mark McCarthy Fremont (California/USA)	317mm (553x)	0.5 delta mag, hair to figure 8 split, white.

STF1872

7^m.5

8^m.3

7.4"

50°

2019

Dra

14^h41^m00.84^s / +57°57'28.10"

7^m.5

10^m.6

75.7"

42°

2015

René Merting Drachhausen (Germany)	320mm (45x)	AB: bei 45x ist die B-Komponente nordöstlich über A erkennbar, ein Blatt Papier passt zwischen die beiden - leichter Farbunterschied - bei 72x zeigt sich ein gut getrenntes Pärchen, B ist eine dreiviertel Magnitude schwächer und blauweiß, A ist gelbweiß
Karsten Kopp Köln (Germany)	600mm (180x)	AB: Doppelstern ist gut zu trennen. Helligkeitsunterschied ist erkennbar, aber nicht besonders auffällig. Der hellere Stern erscheint weißgelblich und der schwächere gelblich.

★★

zeta Boo

STF1865

4^m.5

0.3"

282°

2019

Boo

14^h41^m08.92^s / +13°43'42.00"

H6 104

AB-C

4^m.5

11^m.0

104.3"

260°

2015

Uwe Pilz Leipzig (Germany)	105mm (88x)	AB-C
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

HO59

8^m.3

11^m.8

6.8"

9°

2015

Boo

14^h41^m33.22^s / +44°22'40.70"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Well separated faint B to bright white A. Not physical

STF1871

8^m.0

8^m.1

1.8"

313°

2019

Boo

14^h41^m35.50^s / +51°23'51.30"

Robert Zebahl

Leipzig (Germany)

102mm (187x)

2021-05-16: Clearly separated, but still pretty tight with similarly bright components.

COU407

10^m.0

10^m.3

0.4"

113°

2016

Boo

14^h41^m38.29^s / +27°47'19.90"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Excellent hairline split at 445x and very steady wide at 533x, equal magnitude stars, very light yellow. Spectral class F8, yellow-white. WDS uncertain of binarity, however it most likely is gravitationally bound: 74% parallax range overlap, only 79 AU separation, 210 parsecs distant from us. No radial velocity data so can't compare it to the escape velocity

STF1878, DL Dra

6^m.3

9^m.2

4.2"

314°

2015

Dra

14^h42^m03.25^s / +61°15'42.90"

Uwe Pilz

Leipzig (Germany)

105mm (198x)

starke Aufhellung im ersten Ring

../projects/double-stars/uwe-pilz/sketches/stf1878.jpg

★★

HU575

9^m.8

10^m.1

0.5"

152°

2011

Boo

14^h42^m33.63^s / +19°28'46.90"

Mark McCarthy

Fremont (California/USA)

508mm (1067x)

Short period. Small, faint, but definite split of these orange-red near equal stars. I sketched a clear orientation to field stars. Awesome

★

A1109

7^m.4

9^m.4

1.9"

88°

2017

Vir

14^h42^m47.60^s / +06°35'26.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Both stars light yellow, big magnitude difference, ~3-4 delta mag, about 2". Not difficult

STF1870

7^m.5

10^m.0

4.8"

229°

2015

Boo

14^h42^m55.10^s / +08°04'34.30"

René Merting Drachhausen (Germany)	100mm (213x)	ich musste bis 213x hoch vergrößern, damit B sich überhaupt zeigt - nur ab und an ist die schwächere Komponente gut getrennt südwestlich von A zu erkennen
Mark McCarthy Fremont (California/USA)	203mm (333x)	Yellow A and very much fainter B, wide ~5"? 4 delta mag. B flashes to view with seeing
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow and fairly faint blue B, ~5-6", 3 delta mag.
Karsten Kopp Köln (Germany)	600mm (180x)	Der Doppelstern konnte gut getrennt werden. Der große Helligkeitsunterschied von 2,5 mag ist sehr reizvoll. Der heller Stern erscheint weiß und der kleinere eher gelblich.

STF1875

10^m.2

3.1"

128°

2019

Boo

14^h43^m38.57^s / +37°44'58.40"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Near equal, well separated white stars. Uncertain in WDS, and while the proper motions are similar there is no parallax overlap, so these are comoving not binary

COU607

10^m.2

10^m.9

0.7"

315°

2016

Boo

14^h44^m07.70^s / +31°37'59.10"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

B is quite faint, needed foveal coaxing to bring it forth, and seen only when A forms a steady disk. WDS uncertain of binarity; unfortunately Gaia data shows there is no overlap of the parallax ranges, so it's not a binary

KU49

10^m.6

11^m.0

1.6"

206°

2015

Boo

14^h44^m25.17^s / +41°24'11.30"

Mark McCarthy

Fremont (California/USA)

508mm (445x)

A bit hazy, but suspected elongated at 205x, split with 445x. Faint white stars, near equal, more than 1". Uncertain in WDS but pretty good parallax overlap

STF1873

8^m.0

8^m.3

6.9"

94°

2017

Boo

14^h44^m48.13^s / +07°42'04.00"

René Merting Drachhausen (Germany)	100mm (64x)	bei 32x ist mit etwas Geduld ein 8 erkennbar, Einschnürung nur leicht angedeutet - bei 64x ein knapp getrenntes Pärchen mit leichtem Farbkontrast
Mark McCarthy Fremont (California/USA)	178mm (205x)	Pretty light orange and blue stars, wide, 1 delta. Physical in WDS but my calculator shows there is no overlap in the stars' parallax
Mark McCarthy Fremont (California/USA)	203mm (333x)	Light orange and light blue, wide.
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist leicht zu trennen und der Helligkeitsunterschied ist nur minimal. Der hellere Stern erscheint gelblich und der schwächere weiß-bläulich.

★★

STF1877, epsilon Boo, Izar

2^m.6

4^m.8

2.8"

347°

2018

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

STT285

7^m.8

8^m.7

0.5"

76°

2019

Boo

14^h45^m29.74^s / +42°22'56.40"

Mark McCarthy

Fremont (California/USA)

508mm (445x)

Nicely split white stars, 1 delta mag, noted the PA with drift. Short period, 88.993-year period, it is at apastron and will hang there for the next decade

★★

HLD20, 5 Lib

6^m.5

10^m.1

4.7"

249°

2001

Lib

14^h45^m57.78^s / -15°27'34.40"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

8" 205x Orange star but no companion. 20" 333x Seeing distorted but a much fainter orange star seen as a point outside the diffraction, 5-6", Very fine! Put 8" mask back on @ 333x and can't see the B star!

STF1879

7^m.8

8^m.4

1.7"

82°

2018

Boo

14^h46^m15.58^s / +09°38'48.20"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Fairly close yellow and orange-yellow, ~1 delta mag, ~3"
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern konnte gerade so getrennt werden. Beide erscheinen weißlich.

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

2.1"

58°

2019

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.

BU346

7^m.5

7^m.9

2.8"

277°

2019

Lib

14^h48^m31.71^s / -17°20'24.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Easy, well split, yellow-orange stars, half delta mag.

STF1883

7^m.0

8^m.9

1.0"

278°

2015

Vir

14^h48^m53.22^s / +05°57'15.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Strongly suspect a split / elongation in 80mm finder. In the scope it is a tight 2 delta mag orangish-white pair, ~1"

AG346

9^m.9

10^m.4

9.6"

335°

2015

Boo

14^h49^m04.12^s / +26°27'39.60"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint pair, wide, ~1 delta mag

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

STF1889

6^m.5

9^m.6

15.0"

93°

2015

Boo

14^h49^m32.37^s / +51°22'28.20"

Robert Zebahl

Leipzig (Germany)

102mm (40x)

2021-05-16: Easy to separate with large difference in brightness. The components appeared white-yellowish and greyish.

★

STF1890, 39 Boo

6^m.3

6^m.7

2.5"

46°

2019

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

COU608

9^m.2

11^m.8

1.7"

202°

2015

Boo

14^h49^m55.05^s / +31°59'41.40"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Very fine, bright white A and grey B are nicely separated, using lower power helped control A's diffraction. WDS uncertain of binarity, however Gaia data shows there is no overlap in the parallax ranges, so this is not physical

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

★★★

alpha Lib, Zubenelgenubi, Kiffa Australis, Lanx Australis

SHJ186

2^m.7

5^m.2

231.1"

314°

2012

Lib

14^h50^m52.78^s / -16°02'29.80"

AOT53

2^m.7

12^m.5

275.6"

291°

2000

Component A: 9 Lib, alpha 2 Lib
Component B: 8 Lib, alpha 1 Lib
The standardized name Zubenelgenubi only refers to alpha 2 Lib.

Christopher Hay Seeheim (Germany)	naked eye	AB: Noticed with naked eye and without prior PA knowledge that a secondary was flickering next to Zubenelgenubi. Unexpected and first naked-eye sighting. Checked position with binoculars to be sure. Further naked-eye look at Mizar/Alkor (Zeta UMa) to gauge my momentary acuity and assess the difference to Alpha Lib. Zeta UMa more easily and widely split than ever before, and Alkor appeared for the first time bluish, so this was an exceptional night for naked-eye double-star splitting. Three-star rating awarded because Zubenelgenubi is the second-best naked-eye true-physical double star in the summer sky after Mizar/Alkor.
Christopher Hay Seeheim (Germany)	10x56	AB: Handheld. A strong, wide pair. Both cold white, the secondary more bluish than the primary. Delightful in 6.3° FOV together with the "Zub's Hat" (Hay-Merting 9) asterism directly above (north of) the pair, an array of six stars looking very much like a hat or cap on Zubenelgenubi.
Gerd Kohler Langenzenn (Germany)	254mm (76x)	AB: Bläulich-weiß - leicht bläulich.
Gerd Kohler Langenzenn (Germany)	254mm (76x)	AC: Bläulich-weiß - weiß. Sehr schwacher Begleiter.

★

STF1886

7^m.6

9^m.7

7.9"

224°

2018

Boo

14^h51^m02.31^s / +09°43'25.20"

Robert Zebahl Leipzig (Germany)	102mm (28x)	At 28x, the B component appeared rather faint and pretty close to the primary component. At 62x both components were clearly visible and unequal. A: slightly orange, B: greyish.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow-orange and orange, pretty wide ~10" 2 delta mag
Karsten Kopp Köln (Germany)	600mm (180x)	Einfach zu trennen, aber der Helligkeitsunterschied mit 2,1 mag ist auffällig. Der hellere Stern erscheint gelblich weiß und der schwächere rotbraun. Sehr schön.

Berthold Fuchs

Wiesbaden (Germany)

130mm

close DS

../projects/double-stars/berthold-fuchs/photographs/STF%201886.jpg

★

xi Boo, 37 Boo

STF1888

4^m.8

7^m.0

5.2"

298°

2019

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

337.5"

37°

2015

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

★

STT287

8^m.4

8^m.6

0.6"

5°

2019

Boo

14^h51^m27.53^s / +44°55'42.60"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Wow! Hair-split, ~0.7", near equal to half a delta mag.
Mark McCarthy Fremont (California/USA)	508mm (533x)	An elongated smear at 205x, split with seeing at 445x, stead split at 533x. <1", near equal white stars. Binary with 340-year period, currently tightening to periastron around 2044

HU1153

8^m.6

11^m.2

3.0"

295°

2017

Boo

14^h51^m37.45^s / +15°19'03.10"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

B revealed with foveal coaxing, and I can hold it direct. ~3 delta, ~2" separation, very attractive pair

★

HO389

7^m.0

10^m.5

1.6"

88°

2010

Boo

14^h52^m07.44^s / +20°17'26.50"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Extremely faint B resolves with best seeing as a tiny faint point outside first diffraction. Very tough, very excellent object
Mark McCarthy Fremont (California/USA)	317mm (553x)	Definite split of much fainter pair, ~1.5", somewhat lost in diffraction, but there!

★

A2071, EQ Boo

9^m.3

9^m.9

1.3"

273°

2017

Boo

14^h52^m25.79^s / +17°57'23.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

EQ Boo. ! Very fine pair nicely split, ~1", ~1 delta mag

★

BU31

8^m.5

10^m.3

2.0"

222°

2017

Boo

14^h52^m30.05^s / +18°44'19.50"

Mark McCarthy Fremont (California/USA)	203mm (333x)	White A and light yellow B, finely split, ~2 delta mag
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern konnte gerade so getrennt werden. Die Distanz von 2,0 Bogensekunden und die Helligkeit beider Sterne, macht die Sichtung nicht leicht.

STT288

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.

STF1891

8^m.7

10^m.1

3.5"

246°

2019

Boo

14^h54^m30.04^s / +34°05'14.70"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Ice blue white A and slightly orange B, two delta mag, wide. WDS calls this physical on the strength of the proper motion data, however Gaia shows there is no overlap in the parallax range, so it is not gravitationally bound. Also the escape velocity far exceeds the radial velocity delta, so another strike against it

A1627

8^m.8

0.2"

200°

2016

Boo

14^h55^m46.57^s / +39°38'54.30"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Elongated at 533x, notched at 889x, stronger notch at 1334x. Light orange A, light blue B, equal magnitude. Currently 0.237", it has a 101.25-year period, seen nearly face in, and is at apastron to the SW and will make a quarter turn toward the W and tighten to <0.15" by 2041. Interestingly Gaia lacks data for these stars, so the orbit must be derived from historical measures only

STT289

6^m.2

11^m.1

4.8"

109°

2017

Boo

14^h55^m58.63^s / +32°18'00.30"

Mark McCarthy Fremont (California/USA)	178mm (205x)	B seen averted vision only, well separated. WDS is uncertain but there is a good parallax overlap and they are separated by 503 AU, so it's very likely these are gravitationally bound
Mark McCarthy Fremont (California/USA)	203mm (205x)	8" 205x Noticed a very much fainter star emerge with averted vision then could hold direct. Very fine, well split. 8" 410x Tried to bring out the B star with higher magnification, but oddly it disappeared. 20" 410x B star easily seen though the disks are bloated, seeing not good.

STF1895

8^m.3

8^m.9

12.7"

42°

2017

Boo

14^h57^m27.87^s / +40°09'42.20"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Faint 1 delta mag pair, wide separation.
Mark McCarthy Fremont (California/USA)	508mm (205x)	Wide white stars, half delta mag, one tip of triangle of slightly fainter stars. WDS says this is physical on the strength of the proper motion data, but Gaia shows there is no overlap in the parallax range, so it is not gravitationally bound

★

MLR532

11^m.1

0.6"

230°

1997

Boo

14^h57^m34.23^s / +20°40'31.00"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Beautifully split with 533x, very clear, slight delta mag, light orange stars. It's a little challenging at this magnification with the small scale; the stars were elongated at 205x. WDS uncertain of physicality; Gaia shows no parallax overlap, so sadly this is not

A1628

8^m.6

11^m.6

5.1"

97°

2017

Boo

14^h58^m19.14^s / +41°05'34.50"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Attractive pair, easy, wide, white A and 2 delta mag B, light yellow stars. Spectral class F5, yellow-white. WDS uncertain, however there is no overlap in the parallax ranges, not physical

STF1896

9^m.0

9^m.5

4.1"

277°

2018

Boo

14^h58^m21.57^s / +44°02'35.90"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

White stars, 1 delta mag, wide. Stelle Doppie gives AB as physical with a 4.23-year period, and an orbital plot -- but with separations of 0.02-0.04". Checking the WDS notes, I find: "AB: Radial velocity variations, based on 10 years of monitoring, indicate the presence of a giant planet orbiting the B component, with P = 1544 +/- 34d, a = 2.62 +/- 0.04 au. M sin i = 1.49 +/- 0.09 Mjup. The primary is an SB in an eccentric orbit with period 25-30 y; mass of Ab 0.5-0.6 Msun. No companions were detected by AO imaging." So it seems SD is giving the orbit of the giant planet!

OL187

11^m.2

11^m.4

1.8"

81°

2015

Boo

14^h58^m30.09^s / +15°07'55.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint pair, but with seeing the elongated smear resolves to two points, ~1 delta mag, ~2". [Uncertain pair.]

SHJ191

6^m.9

7^m.6

40.4"

342°

2018

Boo

14^h59^m34.58^s / +53°51'36.70"

Robert Zebahl Leipzig (Germany)	8x40	2020-04-05: Easily separable with clearly visible difference in brightness. Nice separation of the components. Colors not perceptible.
Robert Zebahl Leipzig (Germany)	55mm (27x)	2020-04-05: Widely separated pair with rather small difference in brightness. Primary component: creamy white, companion: slightly orange.
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-24: Widely separated with a moderate difference in brightness. Striking. The brighter component appeared yellowish-orange, the fainter one somehow darker and occasionally also cooler.

HU907

10^m.2

0.2"

277°

2009

Boo

15^h00^m10.00^s / +21°28'48.80"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Very subtly notched olive, very tough. WDS says physical but Gaia lacks data on the stars

STT291, BX Boo

6^m.3

9^m.6

35.6"

156°

2018

Boo

15^h00^m38.72^s / +47°16'38.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Pretty wide, 2 delta mag, white.

STF1899

6^m.7

10^m.2

28.3"

67°

2015

Lib

15^h01^m35.34^s / -03°09'50.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Light orange and faint (on edge of visibility) blue star, wide separation

BU348

6^m.1

7^m.5

0.5"

108°

2016

Vir

15^h01^m48.92^s / -00°08'24.90"

Mark McCarthy

Fremont (California/USA)

203mm (447x)

At 333x, suspect elongation. At 667x, definite elongation. 447x was the best/cleanest view, clearly elongated. With 20" 667x & 447x, the view is too messy

HU1155

9^m.4

10^m.9

4.0"

15°

2018

Boo

15^h01^m51.41^s / +15°06'20.70"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Blue-white stars, B is faint but can detect with direct vision and it flashes with averted. [not physical]

★

STF1909, 44 Boo

5^m.2

6^m.1

0.3"

95°

2019

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)

★

STF1908

9^m.2

10^m.3

1.3"

152°

2015

Boo

15^h04^m56.30^s / +34°28'02.70"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Wow! superfine B split with seeing, light orange stars. B is very faint next to A, a significant delta, >1"

BU119

8^m.1

8^m.8

2.3"

274°

2019

Lib

15^h05^m31.91^s / -07°00'48.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Tried 667x at first but it was too much power, too dim and seeing too choppy. 333x was perfect, clean and well split ~2" near equal, slightly orange

ENG52, 45 Boo

5^m.0

11^m.5

103.7"

40°

2015

Boo

15^h07^m18.06^s / +24°52'09.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Bright white-yellow A, very faint 4-5 delta mag B, bluish, very wide separation.

STF1910

7^m.3

7^m.5

3.9"

211°

2019

Boo

15^h07^m32.95^s / +09°13'33.80"

Robert Zebahl Leipzig (Germany)	70mm (44x)	2020-04-24: At 31x clearly visible as figure '8' and almost separated with similarly bright components. At 44x still very tight, but separated pair. Overall rather faint with little difference in brightness. The primary component appeared slightly yellowish-orange.
René Merting Drachhausen (Germany)	100mm (64x)	bei 32x ist noch nichts auffälliges zu erkennen - bei 64x zeigt sich ein eng stehendes Pärchen zweier gleich heller weißer Sterne, knapp getrennt - ein ziemlicher Sprung von "nichts zu sehen" zu "getrennt zu sehen"

Berthold Fuchs

Wiesbaden (Germany)

130mm

close DS

../projects/double-stars/berthold-fuchs/photographs/STF%201910.jpg

HJ2766

5^m.8

12^m.2

57.6"

331°

2016

Boo

15^h08^m35.56^s / +25°06'31.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange-yellow A with very wide, very faint B, ~ 4 delta mag.

STF3090

9^m.1

9^m.3

0.6"

289°

2018

Vir

15^h08^m42.97^s / -00°58'50.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Notched to hairline split at the best moments. Faint pair, tough. Seeing not good enough to go above 553x.

BU349

7^m.6

10^m.9

3.4"

38°

2019

Vir

15^h08^m57.33^s / +01°41'21.40"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

B star easily seen despite diffraction. Can only see with 8" 333x after first having seen it in the 20", and even then need averted vision to bring it out

★

A690

10^m.0

10^m.5

0.9"

10°

2000

Boo

15^h09^m09.80^s / +28°08'48.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very tough, seems fainter than 9th and 10th mag as given in SkyTools (and indeed it is, both fainter by another half mag), and also closer than 1". With seeing only, significant delta mag, and very close, hairline only

STF1916

8^m.4

10^m.6

9.8"

332°

2018

Boo

15^h09^m54.15^s / +38°58'33.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Yellow and reddish B, 1.5 delta mag, 8-10"

TDS768

10^m.2

10^m.6

0.9"

12°

2016

Boo

15^h09^m58.47^s / +28°06'59.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very fine, light orange stars, just split as a hairline, significant mag difference, maybe 1 delta mag

STF1927, BV Dra

8^m.1

8^m.8

16.5"

354°

2015

Dra

15^h11^m50.36^s / +61°51'25.30"

René Merting

Drachhausen (Germany)

18x70

ein ganz enges Sternpaar - B im Norden zeigt sich knapp getrennt von A und ist vielleicht eine dreiviertel Größenklasse schwächer als die südliche Komponente

STF1921

8^m.6

8^m.7

30.3"

283°

2017

Boo

15^h12^m00.00^s / +38°40'12.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very wide white pair, 1 delta mag, easy!

STF1919

6^m.7

7^m.4

23.4"

11°

2019

Ser

15^h12^m43.48^s / +19°17'09.80"

Mark McCarthy Fremont (California/USA)	80mm (94x)	Near equal, white, wide
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein ordentlich getrenntes Pärchen - Helligkeitsunterschied eine halbe Größenklasse - A wirkt leicht gelblich, B ist grau - 20x reicht auch zur Trennung
Mark McCarthy Fremont (California/USA)	203mm (205x)	Pretty wide separated stars, both white with a tint of yellow. Half delta mag.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Very wide yellow and orange-yellow. In an arc of three stars, with nice orange carbon star at the other end.

ES2648

7^m.3

11^m.2

26.3"

341°

2015

Boo

15^h12^m43.76^s / +48°34'50.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange with very faint bluish star, 3-4 delta mag., ~0.8"

H5 125

8^m.4

9^m.5

32.2"

228°

2017

Boo

15^h12^m47.74^s / +27°55'35.60"

René Merting

Drachhausen (Germany)

100mm (20x)

bei 20x zeigen sich zwei schwache Sternchen weit getrennt - Komponente B nicht signifikant schwächer - Farbkontrast zwischen beiden Sternen erkennbar, B mitunter bei 32x mit kupfernem Glanz

STT292

6^m.2

9^m.4

117.6"

158°

2017

Boo

15^h14^m06.04^s / +31°47'16.20"

René Merting Drachhausen (Germany)	18x70	ein Doppelstern mit Riesenabstand und großem Helligkeitsunterschied von mindestens 2.5 bis 3 Magnituden - B im SO ist gerade so erkennbar und weißgrau, A ist weißgelblich
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange star with two possible wide pairs, just pick one of the stars and that's B!]

STT293

8^m.6

11^m.9

11.1"

345°

2015

Ser

15^h15^m27.22^s / +22°32'57.40"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

White A and faint wide B. WDS says physical, and it does overlap parallax range and is 840 AU separated. No radial velocity for the B star

★★

STFA27, delta Boo, 49 Boo

3^m.6

7^m.9

105.0"

78°

2017

Boo

15^h15^m30.16^s / +33°18'53.40"

Christopher Hay Seeheim (Germany)	15x45	Handheld, binoculars with internal stabilisation. Very wide. Component A is of a slight yellow-orange hue, its companion too weak (NELM in target area: 5m0) for colour impression. Nice in 4.5° FOV with Mu Boo AB, which is visibly slightly wider than Delta Boo and whose component B is slightly brighter than that of Delta Boo. Delta Boo is a physical double at a distance to us of 122 light years.
René Merting Drachhausen (Germany)	18x70	ein sehr ungleiches, weit auseinander stehendes Sternpaar - Komponente A im Westen strahlt gleißend cremegelb, die wesentlich schwächere Komponente B im Osten ist weißgrau bis bräunlich
Robert Zebahl Leipzig (Germany)	70mm (22x)	2020-04-24: Widely separated pair with large difference in brightness. Less striking. The bright primary component shines in a bright yellow.
Mark McCarthy Fremont (California/USA)	80mm (13x)	Split in 80mm finder. Very wide pair, very bright A, 3 delta mag B. Orange-yellow and blue-white B
Mark McCarthy Fremont (California/USA)	80mm (94x)	Delta Boo. Wide, large delta mag B, a 76,000-period pair!
Mark McCarthy Fremont (California/USA)	203mm (205x)	Bright star with many nearby faint stars. Didn't bother trying to figure out which are which.

Frederik Wanink

Itterbeck (Germany)

254mm

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

STF3091

AB-E

7^m.3

12^m.0

41.3"

46°

2015

Ser

15^h16^m01.56^s / -04°53'52.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

White with very much fainter wide blue B. (AB-E seen, missed AB 0.5")

HO547

7^m.8

11^m.4

5.5"

291°

2015

Ser

15^h16^m25.62^s / +16°47'39.40"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

The B star was first detected at 20-inch, but with 7-inch it was very difficult averted vision only. WDS says physical and it does overlap parallax and 256 AU separation; no radial velocity for the B star

STF1934

9^m.5

9^m.6

9.8"

13°

2017

Boo

15^h17^m22.50^s / +43°47'36.90"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint, wide, slight mag difference, reddish color stars (Spectral G5, yellow)

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!

STF1931

7^m.2

8^m.1

13.4"

166°

2018

Ser

15^h18^m41.98^s / +10°25'39.70"

7^m.2

12^m.7

172.9"

93°

2015

Robert Zebahl Leipzig (Germany)	70mm (22x)	AB: 2020-04-24: At 22x clearly separated with a moderate difference in brightness. Striking, but still pretty tight. Primary component appears pale orange, the companion grey-blue. At 31x nice color contrast.
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 32x enges Pärchen, gut getrennt - Komponente B im Süden ist eine halbe Magnitude schwächer und grauweiß ggü. der weißen Komponente A - zurück auf 20x ist das Paar auch noch knapp getrennt erkennbar
Mark McCarthy Fremont (California/USA)	178mm (205x)	AB: Widely separated white stars. WDS has as physical and my calculator agrees, though there is no orbit as yet

★★

STF1930, 5 Ser

5^m.1

10^m.1

11.1"

36°

2017

Ser

15^h19^m18.79^s / +01°45'55.50"

Stefan Loibl Rosenheim (Germany)	102mm (68x)	Messier 5 in the same FOV, wonderful
Mark McCarthy Fremont (California/USA)	178mm (205x)	Light yellow-white A and wide 3 delta B. WDS says physical and this is correct: 74% parallax overlap, 289 AU separation, and the radial velocity is less than the escape velocity
Mark McCarthy Fremont (California/USA)	203mm (333x)	Light yellow bright A, very much fainter orangish B, wide separation. Near M5.

STTA138

7^m.6

7^m.8

151.9"

195°

2015

Dra

15^h20^m05.12^s / +60°22'48.70"

7^m.6

9^m.3

90.5"

162°

2015

7^m.8

9^m.3

91.6"

49°

2015

René Merting

Drachhausen (Germany)

18x70

AB: ein helles Pärchen, weit getrennt, sehr weit
AC: die C-Komponente ist deutlich schwächer und steht zwischen A und B östlich von beiden, so dass alle drei Sterne ein flaches Dreieck bilden - C steht etwas näher an A als an B

STF1935

9^m.9

10^m.2

8.6"

289°

2015

CrB

15^h20^m13.27^s / +30°41'44.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Faint wide pair, 1 delta mag.

HO62

10^m.0

10^m.1

1.5"

103°

2017

Boo

15^h20^m46.77^s / +34°59'00.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Equal magnitude white, close but nicely split ~1.5"

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

STF1936

9^m.9

10^m.1

19.8"

231°

2015

CrB

15^h21^m07.63^s / +27°02'23.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Pretty faint near equal wide white pair through finder. In scope one star splits into a close double

STF3092

9^m.2

11^m.7

14.1"

166°

2015

Ser

15^h21^m45.10^s / -02°00'50.40"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint pair, B can barely be seen with direct visions, brightens with averted. Wide. WDS says physical but there is no parallax range overlap; the proper motions are similar so these are comoving only

HO264

8^m.2

11^m.0

1.2"

298°

2010

Ser

15^h21^m54.91^s / +16°30'08.00"

Mark McCarthy

Fremont (California/USA)

178mm (445x)

Difficult with 70inch. Suspected at 205x as a brightening with averted vision, more certain split and visibility with 445x, but still averted vision only. WDS says physical but there is no overlap in the parallax range; proper motions are a little divergent so it's not certain these are comoving or not

HJ2777

7^m.4

12^m.1

42.6"

342°

2015

CrB

15^h22^m25.32^s / +25°37'27.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

UV CrB: Light orange with very faint blue B, very wide 3 delta mag.

★

STF1937, eta CrB

5^m.6

6^m.0

0.4"

264°

2019

CrB

15^h23^m12.23^s / +30°17'17.70"

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.

A1367

11^m.0

0.6"

156°

2016

Boo

15^h23^m16.44^s / +36°18'30.60"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

White stars, seeing needs to settle for the pair to flash, brighter with averted vision. Hairline split in good seeing, snowman when seeing poor. Did not notice AB-C, which is 13th mag 9"

TDS9506

10^m.6

10^m.8

0.4"

31°

2016

CrB

15^h24^m07.11^s / +28°13'55.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Snowman only, seeing too poor to push higher magnifications needed

★★★

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

109.0"

172°

2018

STF1938, mu 2 Boo

Ba-Bb

7^m.1

7^m.6

2.3"

3°

2019

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

BUP162, iota Dra, 12 Dra, Edasich

3^m.4

8^m.9

253.7"

50°

2015

Dra

15^h24^m55.77^s / +58°57'57.80"

René Merting

Drachhausen (Germany)

18x70

B zeigt sich weitab nordöstlich von der gelblich strahlenden Hauptkomponente mit dem schönen Eigennamen Edasisch - B ist sehr schwach, entgeht aber relativ sicher dem Glow der A-Komponente

A1632

10^m.4

11^m.0

1.8"

61°

2015

Boo

15^h25^m17.17^s / +46°07'46.30"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Faint but nice pair, split well ~2", half or more delta mag, white

★★

STF1941

9^m.7

9^m.8

1.4"

212°

2017

CrB

15^h25^m42.81^s / +26°37'40.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Faint, very close equal pair, ~1.5". Nice!

★★

STT296

7^m.8

9^m.1

2.1"

274°

2019

Boo

15^h26^m26.56^s / +44°00'13.20"

7^m.8

12^m.7

80.7"

313°

2016

Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: Very fine but well split, ~2", yellow-white A, reddish B, 2 delta mag.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Very beautiful, 2", 2 delta mag, with very faint third (AC) seen with averted vision widely separated.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AC: Very beautiful, 2", 2 delta mag, with very faint third (AC) seen with averted vision widely separated.
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Close near equal, 1 delta mag, white.

KU50

10^m.3

10^m.5

2.9"

336°

2018

Boo

15^h26^m53.02^s / +46°09'32.40"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Faint in poor sky conditions & moon, well split, <3", nearly equal white. Not physical

STF1946

9^m.3

10^m.9

7.6"

344°

2015

Boo

15^h27^m09.01^s / +39°29'35.50"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Easy light orange A and ~2 delta mag B, pretty wide ~8"

A1120

8^m.5

9^m.1

0.3"

334°

2018

Ser

15^h27^m18.03^s / +09°42'01.10"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Fairly strong notch but no split, not separated, snowman PA to west of north, >1 delta mag. Physical with 51.75-year period, grade 3 orbit (likely), 0.246" now. It is now coming off apastron and will close by the early 2030s, detectible visually again by 2045 or so

STF1943

9^m.3

9^m.6

5.1"

148°

2019

Ser

15^h27^m37.68^s / +05°22'06.20"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Easy wide 1 delta. WDS says physical, and there is strong 92% parallax overlap, only 450 AU separation, however the delta in radial velocity exceeds the escape velocity, so this is not a gravitationally bound pair

KU108

7^m.5

9^m.7

40.7"

319°

2015

Boo

15^h27^m40.35^s / +42°52'52.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

White A and reddish B stars. Wide, 2 delta mag. [Need to try this with the 20": BC = RAO 18 9.74/11.00 0.4"]

STF1944

8^m.3

8^m.8

0.7"

293°

2019

Ser

15^h27^m42.14^s / +06°06'04.50"

Mark McCarthy

Fremont (California/USA)

178mm (445x)

Hairline split wit seeing, significant magnitude difference, difficult. Physical with a 1030-year period, on the historical measures alone since there is no Gaia data for the secondary. It will continue to tighten to 0.4" by 2090, moving in the fastest part of its orbit

★

JEF1, bet CrB

3^m.7

5^m.2

0.3"

140°

2019

CrB

15^h27^m49.85^s / +29°06'19.80"

Mark McCarthy

Fremont (California/USA)

762mm (457x)

Suspect out of roundness in the star disk. Tried with and without a hexagon mask

STF1947

10^m.0

10^m.4

6.8"

26°

2015

Boo

15^h28^m09.87^s / +38°21'38.10"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

FL Boo. Near equal wide, no color noticed

A1369

10^m.7

11^m.5

4.2"

316°

2019

CrB

15^h28^m46.74^s / +31°00'46.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

~1 delta mag, close ~4", white, B a little winkey due to seeing. C is wide and brighter

STF1972, pi 1 UMi

6^m.6

7^m.3

31.6"

80°

2018

UMi

15^h29^m11.19^s / +80°26'55.00"

René Merting

Drachhausen (Germany)

100mm (20x)

bei 32x weit getrennt - Komponente B ist nur knapp schwächer als A - Komponente A gelblich-weiß, B sorgt für einen sanften Farbkontrast mit weiß und einem Stich ins orange - bei 20x ebenfalls ein weit getrenntes Pärchen in schönem Umfeld mit vielen gleich hellen Sternen

★★

STF1950

8^m.1

9^m.2

3.3"

92°

2019

Ser

15^h29^m58.46^s / +25°30'31.10"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Very fine orange pair 2 delta mag, ~1.5". B appears fine and delicate.

ROE48

10^m.2

10^m.5

8.6"

221°

2017

Boo

15^h30^m24.14^s / +45°42'03.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

~1 delta mag, wide, fairly faint

COU974

10^m.6

11^m.3

1.5"

338°

2015

Boo

15^h30^m33.20^s / +35°04'23.60"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Faint bluish elongation, separated with seeing, very close, slight mag difference

HU1163

9^m.2

9^m.7

0.3"

178°

2015

Boo

15^h30^m44.95^s / +38°09'48.70"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Barest hairline split at the best moments, snowman otherwise, very noticeable magnitude difference, PA to south. 0.257" now, it will widen slightly the next 30 years, reaching apastron around 2090 at ~0.4". Grade 3 orbit, 217-year period

STF1952

AB-C

8^m.7

10^m.1

16.1"

220°

2019

Ser

15^h31^m54.80^s / +09°39'39.20"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very wide one delta

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.

STF1953

9^m.7

10^m.6

6.7"

253°

2018

Ser

15^h32^m57.15^s / +05°30'32.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Pretty wide 1 delta. WDS says physical and this is probably correct: 14% parallax overlap, 2,044 AU separation, however no radial velocity for the primary

STF1955

9^m.8

10^m.3

7.8"

237°

2017

CrB

15^h33^m51.28^s / +26°42'30.40"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Near equal white stars, wide

COU798

9^m.5

9^m.8

0.1"

181°

2008

CrB

15^h34^m40.64^s / +26°54'42.80"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Barest of notches, white stars, noticeable magnitude difference. PA to the south. It's in the same low power (205x) field of view with Gemma, alpha CrB, so it looks like a piece of debris from the bright star explosion as seen in the eyepiece. Grade 4 orbit, 0.256" now, will widen only slightly by 2050 apastron. 154.7-year period

STF1959

9^m.8

10^m.8

2.2"

244°

2018

CrB

15^h34^m44.13^s / +34°43'22.80"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Close and faint at this scale, B is 1 delta mag, white stars. WDS uncertain, however there is no overlap in the parallax range, so not gravitationally bound

STF1954, delta Ser, 13 Ser

4^m.2

5^m.2

4.0"

171°

2019

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

HO63

10^m.9

11^m.2

1.5"

311°

2010

CrB

15^h35^m47.09^s / +28°22'51.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

This is an unequal pair, needed averted vision to flash B and only when seeing is good will it split

COU799

10^m.8

11^m.2

1.0"

265°

2015

CrB

15^h35^m59.13^s / +31°42'38.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Split with seeing, bluish stars, noticeable mag difference

★

STT298

7^m.2

8^m.4

1.3"

187°

2017

Boo

15^h36^m02.22^s / +39°48'08.90"

AB-C

6^m.9

7^m.8

120.4"

328°

2017

AB-D

6^m.9

13^m.9

167.4"

224°

2002

AB-E

6^m.9

12^m.1

456.0"

335°

2002

Robert Zebahl Leipzig (Germany)	102mm (28x)	AB-C: Wide, moderately unequal pair. Little difference in color: Primary components appeared a bit more orange colored.
Robert Zebahl Leipzig (Germany)	120mm (23x)	AB-C: Easy to split with large angular distance and noticeable difference in brightness.
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: At zenith, but worth the effort to slew to. Another great 2+1. The tight pair [AB] is near equal and split a little more than a hairline
Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: One component of compicated 6 star system, some of which is split in 80mm finter. This is a close equal pair, ~2".

COU1444

10^m.6

11^m.5

1.0"

311°

2019

Boo

15^h36^m19.03^s / +42°59'39.40"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

With seeing, bluish near equal, nice split

STF1963

8^m.5

8^m.8

5.2"

298°

2019

CrB

15^h37^m53.73^s / +30°06'10.40"

Mark McCarthy

Fremont (California/USA)

317mm (340x)

81 Vir: Well split close pair of yellow stars about equal magnitude

★★

STF1964 & HU1167

HU1167

8^m.1

9^m.9

1.4"

80°

2016

CrB

15^h38^m12.91^s / +36°14'48.60"

STF1964

8^m.1

14.5"

90°

2017

STF1964

8^m.1

9^m.0

15.1"

84°

2018

STF1964

8^m.1

9^m.0

1.5"

21°

2019

Robert Zebahl Leipzig (Germany)	16x70	STF1964 (AC): 2021-06-13: Beautiful double star with components of almost equal brightness and subtle color difference: white-bluish & slightly orange.
René Merting Drachhausen (Germany)	18x70	STF1964 (AC): zu erkennen sind zwei gleich helle, sehr dicht stehende Sterne - Trennung ein wenig mehr als knapp
René Merting Drachhausen (Germany)	100mm (20x)	STF1964 (AC): bei 20x ein gut getrenntes Pärchen gleich heller Sterne, auffallend im Sternumfeld
Robert Zebahl Leipzig (Germany)	102mm (62x)	STF1964 (AC): Rather wide pair, equal without visible difference in color.
Uwe Pilz Leipzig (Germany)	105mm (16x)	Dreifachstern nicht trennbar
Robert Zebahl Leipzig (Germany)	120mm (23x)	STF1964 (AC): Nice double star, well split with equally bright components.
Mark McCarthy Fremont (California/USA)	317mm (277x)	STF1964 (AC): Well split equal pair. I suspect B is pair as it is an elongated orange smear at 277x -- it is STF 1964CD.
Mark McCarthy Fremont (California/USA)	317mm (553x)	STF1964 (CD): Faint near equal pair about 3" separation. In the same field with HU 1167. Magnificent
Mark McCarthy Fremont (California/USA)	317mm (553x)	HU1167 (AB): Bright star with much fainter pair, about 1" separation, 3-4 delta mag. In same field with STF 1964. Magnificent

COU612

9^m.2

9^m.0

0.3"

342°

2016

CrB

15^h39^m02.60^s / +25°44'47.00"

Mark McCarthy

Fremont (California/USA)

508mm (889x)

Very slight elongation all powers, PA N-S but can't tell A from B. Physical with 63.09-year period, it's coming off apastron and will be difficult to detect visually until the 2060s

★

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

STT300

6^m.3

10^m.1

14.5"

262°

2019

Ser

15^h40^m10.35^s / +12°03'10.60"

René Merting Drachhausen (Germany)	100mm (64x)	bei 32x war B anscheinend noch zu schwach - bei 64x ist B ganz schwach gut abgesetzt vom gelblich schimmernden Hauptstern erkennbar
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange-yellow with wide separation bluish B, 3 delta mag.

★

STF1967, 8 CrB, gamma CrB

4^m.0

5^m.6

0.5"

110°

2015

CrB

15^h42^m44.57^s / +26°17'44.30"

Robert Zebahl Leipzig (Germany)	152mm (300x)	2021-07-23: Gamma 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)	Definite mis-shape, oval to egg, observation made June 2019

PRT5

10^m.7

4.5"

44°

2019

CrB

15^h44^m47.00^s / +35°33'40.80"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

White near equal pair, well split ~5"

★

AG198

9^m.2

10^m.1

2.2"

144°

2017

Ser

15^h45^m20.23^s / +04°31'56.50"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Wow! Very fine direct vision, both disks are clear, white stars, 2 delta. WDS uncertain of binarity, and I find they are not: no parallax range overlap, and the escape velocity exceeds the radial velocity

STF1968

9^m.5

10^m.5

14.4"

93°

2017

Ser

15^h45^m23.29^s / -01°23'29.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Easy wide 1 delta. WDS says physical, and while there is 28% parallax overlap and 1,314 AU, the escape velocity is almost twice the radial velocity, so if they are bound they won't be for long

BU240

8^m.8

10^m.2

1.9"

131°

2015

Ser

15^h45^m31.73^s / +04°01'37.10"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Very like AG 198 in appearance: 2 delta mag very close but very plain, excellent. Unfortunately this is just a line of sight pair, there is no overlap of the parallax ranges

STF1970, beta Ser, 28 Ser

3^m.7

10^m.0

29.4"

265°

2019

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
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.

★★

STT301

7^m.5

10^m.4

4.0"

27°

2017

Boo

15^h46^m13.64^s / +42°28'06.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Wow. Relatively bright A, orange, with a very faint B which shimmers and sparkles to view with averted vision and held with direct. B star is small, 4-5 delta mag, 6-8"

★★

STF1973

7^m.6

8^m.8

30.8"

320°

2015

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.

EIS1

7^m.5

11^m.9

17.7"

353°

2017

Ser

15^h48^m09.46^s / +01°34'18.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

White A with wide and much fainter B. CDSA says: "Local, solar type double with BY Dra type variable."

COU801

11^m.3

11^m.8

1.5"

196°

2015

CrB

15^h48^m43.01^s / +32°39'36.40"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint and a bit difficult with the small aperture and low magnification, mostly elongated but does resolve and split with seeing. This one is likely to be gravitationally bound, there is 45% overlap in the parallax range and 399 AU separation

STF2034

7^m.7

8^m.0

1.1"

110°

2017

UMi

15^h48^m43.02^s / +83°37'10.50"

Robert Zebahl

Leipzig (Germany)

102mm (187x)

At 187x clearly elongated, partly visible as '8' with slight difference in brightness. At 280x two distinct, slightly overlapping Airy disks visible.

STF1974

8^m.9

9^m.1

2.5"

159°

2018

Ser

15^h49^m11.99^s / -03°14'01.10"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

White stars, <1 delta mag, close but good separation <3". 24% parallax range overlap, 343 AU separation, so chances are good this is gravitationally bound

★

BU621

7^m.9

9^m.4

0.6"

27°

2018

Boo

15^h49^m49.96^s / +44°31'19.50"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

nice, split with seeing, 2 delta mag, very close, very slightly orange and yellow stars.

ES1554

11^m.0

11^m.2

4.9"

2°

2019

Boo

15^h49^m51.07^s / +43°50'42.10"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

near equal but wide separated stars, 10th 11th mag.

STF1982

9^m.9

10^m.1

4.8"

299°

2019

Boo

15^h49^m51.25^s / +42°47'19.60"

Mark McCarthy Fremont (California/USA)	508mm (667x)	near equal wide separated orange stars.
Karsten Kopp Köln (Germany)	600mm (180x)	Trotz der geringen Sternhelligkeit, beider Sterne, mit 9,9 und 10,1 mag, konnte der Doppelstern gut getrennt werden. Der etwas hellere erscheint gelblich und der schwächere weißlich.

STF3126

10^m.4

10^m.3

2.3"

279°

2018

Ser

15^h50^m04.27^s / -03°10'38.50"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Challenging near equal stars, one fades with seeing then when settled it makes a nice close around 2" split with the other. This is gravitationally bound: 25% parallax overlap, 378 AU separation, and the escape velocity is less than the radial velocity difference

★

SKF1311

5^m.3

10^m.3

74.8"

300°

2015

Ser

15^h50^m17.55^s / +02°11'47.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Cool. Bright yellow-orange star broken up by seeing and with a water vapor glow (sky is deteriorating). Much fainter B star hanging at edge of halo.

HJ574

9^m.3

12^m.3

15.8"

94°

2015

CrB

15^h50^m18.44^s / +32°24'22.40"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

light orange star with two rather fainter in a near line, fainter one (AB) closer in (further is AC).

★

BU810

9^m.1

10^m.8

1.6"

84°

2016

Her

15^h51^m00.24^s / +42°27'59.50"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Very cool, light orange and blue, close but very good split. 2 delta mag.

COU1447

11^m.0

11^m.3

2.3"

297°

2015

CrB

15^h51^m14.02^s / +38°36'27.80"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

nice pair, equal, well separated, faint.

STF1983

10^m.2

11^m.7

14.1"

64°

2015

CrB

15^h51^m57.93^s / +35°27'39.00"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint white star with wide 2 delta fainter companion, seen with averted vision at first but then can easily hold it direct

STT302

7^m.2

10^m.4

28.6"

51°

2015

CrB

15^h54^m56.85^s / +34°21'45.00"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Faint pair, pretty close, ~2"

HO399

7^m.7

10^m.5

3.6"

116°

2019

CrB

15^h55^m25.81^s / +29°32'13.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Relatively bright A star with very faint pair, need averted vision to notice, ~4" separation and 4-5 delta mag

STF1985

7^m.0

8^m.7

6.1"

357°

2019

Ser

15^h55^m54.63^s / -02°09'51.30"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Ice blue color A and slightly red B, >1 delta mag, pretty wide. 2307.2358-year period, it will slowly widen

STF1988

7^m.6

7^m.8

1.7"

249°

2019

Ser

15^h56^m45.53^s / +12°28'40.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Near equal yellow-white pair, ~2".

HJ577

9^m.3

10^m.5

9.4"

13°

2015

CrB

15^h56^m48.71^s / +35°30'15.60"

Mark McCarthy Fremont (California/USA)	508mm (667x)	wide separated orange-yellow and blue, 1 delta mag. nice
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern konnte gut getrennt werden. Beide Sterne erscheinen weißlich.

COU803

11^m.1

11^m.2

1.6"

217°

2015

CrB

15^h56^m52.06^s / +32°44'11.70"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

very fine, very nice pair, equal, well separated close pair.

STF1987

7^m.3

8^m.7

10.4"

320°

2017

Ser

15^h57^m14.92^s / +03°24'19.20"

René Merting

Drachhausen (Germany)

100mm (32x)

bei 32x ein schön eng zusammen stehendes Pärchen - Komponente B im NW ist über eine Größenklasse schwächer und dadurch leicht blau-grau gegenüber der weißen A-Komponente

STF1991

9^m.4

10^m.4

3.0"

195°

2019

Her

15^h57^m26.92^s / +41°39'42.90"

9^m.4

8^m.8

95.0"

87°

2015

Robert Zebahl

Leipzig (Germany)

102mm (86x)

2021-08-20: The pair AB-C is easily visible already at 28x, with C being the brightest component and standing apart quite far from AB. At 86x the much closer pair AB is then also easily visible. The separation is easy, but the companion B is quite faint. Component C appeared slightly yellowish, A a bit darker. A nice triple system, which reminds me of mu Bootis.

AGC7, eps CrB

4^m.1

12^m.6

2.0"

10°

2002

CrB

15^h57^m35.30^s / +26°52'40.90"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Epsilon CrB. I'm amazed I can get a tiny pinpoint to the north at low magnification, it holds steady just out of A's diffraction. A is a light yellow-orange. Spectral K2IIIab (yellow-orange). Insufficient Gaia data on the secondary

STF2006

8^m.5

10^m.0

1.5"

177°

2018

Dra

16^h00^m18.28^s / +58°56'03.00"

8^m.5

9^m.7

48.0"

211°

2015

René Merting

Drachhausen (Germany)

18x70

AC: Komponente A ist schon ein schwacher Stern, B ist noch schwächer, zeigt sich aber gut getrennt südwestlich von A

STT303

7^m.7

8^m.1

1.6"

175°

2019

Ser

16^h00^m54.16^s / +13°16'18.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Near equal white, ~1.5". Nice!

STT304

6^m.8

10^m.6

10.4"

173°

2015

CrB

16^h00^m54.94^s / +39°10'39.00"

Mark McCarthy Fremont (California/USA)	508mm (667x)	yellow-orange, bright, with wide sep 3 delta mag pair.
Karsten Kopp Köln (Germany)	600mm (180x)	Einfach zu trennen, aber trotz großen Helligkeitsunterschied von 3,8 mag eher unspektakulär.

S676, rho CrB

5^m.5

10^m.5

141.7"

47°

2012

CrB

16^h01^m02.65^s / +33°18'12.60"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Rho CrB. bright orange star with very obvious wide B, 3 delta mag

AG200

10^m.6

10^m.9

3.1"

216°

2019

CrB

16^h01^m09.14^s / +39°36'11.80"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

light orange yellow, fine, well split 3" equal.

FOX193

10^m.8

11^m.5

10.9"

18°

2015

Ser

16^h01^m37.81^s / +10°24'21.70"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Faint, wide, slight magnitude difference, white. No parallax overlap

TDS797

11^m.4

11^m.8

0.9"

86°

2015

CrB

16^h02^m25.87^s / +35°53'56.50"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

two near equal very faint stars resolve from haze with averted vision.

STF2000

8^m.4

9^m.2

2.5"

227°

2019

Ser

16^h03^m02.17^s / +13°59'28.80"

René Merting

Drachhausen (Germany)

100mm (107x)

bei 107x ein knapp getrenntes Pärchen, Komponente B südwestlich etwas schwächer - bei 142x wird der Anblick nicht wirklich besser

STF2004

9^m.5

10^m.3

1.8"

278°

2015

CrB

16^h03^m12.42^s / +28°51'06.50"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Nice airy disks. Orange stars 1 delta mag, well split, very pretty

AG201

10^m.5

10^m.7

8.0"

253°

2018

Her

16^h04^m03.68^s / +48°57'25.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Slight magnitude difference, white, wide

HJ581

12^m.0

12^m.1

21.2"

56°

2015

CrB

16^h04^m14.01^s / +32°22'10.90"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

faint wide near equal.

STF1999

7^m.4

8^m.0

11.9"

98°

2019

Sco

16^h04^m25.96^s / -11°26'57.60"

7^m.4

11^m.4

84.5"

85°

2015

7^m.4

4^m.1

278.5"

351°

2006

8^m.0

11^m.4

73.0"

82°

2015

René Merting

Drachhausen (Germany)

18x70

AB: zwei annähernd gleich helle Sterne, äußerst knapp getrennt - Komponente B im Osten ist nur leicht schwächer in der Helligkeit - Komponente D soll der 279" weiter nördlich stehende 4.1 mag helle Stern Xi Sco sein, der ist natürlich sichtbar, aber ohne jedes Doppelsternfeeling

WNO47

6^m.7

12^m.9

70.0"

280°

2015

CrB

16^h04^m56.79^s / +39°09'23.40"

Mark McCarthy Fremont (California/USA)	508mm (205x)	Tried but did not see faint B star in 8", so switched to 20". Wide split and faint. nothing too special visually, but intellectually, according to the Cambridge Double Star Atlas: "Local, high CPM, low mass double, AB: ps = 13,70 AU (2000)
Mark McCarthy Fremont (California/USA)	508mm (205x)	Did not see faint B star in 8", so switched to 20". Wide split and faint. nothing too special visually, but intellectually interesting, per CDSA: "Local, high CPM, low mass double, AB: ps = 13,70 AU (2000).

★

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

STF2007

6^m.9

8^m.0

37.7"

322°

2019

Ser

16^h06^m02.82^s / +13°19'15.50"

6^m.9

10^m.8

162.7"

137°

2015

René Merting Drachhausen (Germany)	16x70	AB: gut getrenntes Sternpaar - Komponente B im NW ist deutlich schwächer und schmutzig grau gegenüber der weißen A-Komponente
Mark McCarthy Fremont (California/USA)	80mm (13x)	AB: Split in finder. Two yellow stars, 2 delta mag, wide.
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x weit getrennt, B nordwestlich dürfte gut eine Magnitude schwächer sein - tolle Farben, A ist gelblich, B strahlt orange

STF2011

7^m.9

10^m.2

2.7"

67°

2015

CrB

16^h07^m38.27^s / +28°59'43.60"

Mark McCarthy Fremont (California/USA)	317mm (553x)	White and reddish 3 delta mag, ~2".
Mark McCarthy Fremont (California/USA)	508mm (667x)	Fine pair, 2 delta mag, blue white and dull b almost brown.

BU355

7^m.5

8^m.8

0.2"

287°

2001

Her

16^h07^m59.39^s / +45°22'49.10"

Mark McCarthy

Fremont (California/USA)

508mm (1334x)

Subtle notch / peanut shape only at all powers, PA on EW line though difficult to tell which is the primary, light orange stars (spectral class K0, yellow-orange). Burnham discovered with his 6-inch at 0.3" in 1876. WDS uncertain of binarity, and unfortunately Gaia only has data for the primary

STF2010, kappa Her, 7 Her

5^m.1

6^m.2

27.0"

14°

2019

Her

16^h08^m04.55^s / +17°02'49.20"

5^m.1

13^m.4

62.7"

212°

2015

René Merting Drachhausen (Germany)	16x70	AB: ein eng stehendes Pärchen mit einem leichten Farbkontrast, weil Komponente B im Norden mindestens eine Größenklasse schwächer erscheint - dadurch wirkt B gegenüber nicht rein weiß, sondern dumpf grau-weiß
René Merting Drachhausen (Germany)	100mm (20x)	AB: bei 20x leicht zu trennen - zwei richtig helle Sterne, B im Norden eine halbe Größenklasse schwächer - bei 64x schöner Farbkontrast, Komponente A satt gelb, B weiß mit einem Stich ins orange
Karsten Kopp Köln (Germany)	600mm (135x)	AB: Sehr einfacher Doppelstern. Komponente A erscheint orange, während die Komponente B weiß scheint.

★

COU1276

10^m.9

12^m.9

3.3"

53°

2015

CrB

16^h08^m52.28^s / +37°58'00.80"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Good find, B star only visible averted vision, flashes out obvious and clear.

★

STF2015

8^m.2

9^m.5

3.0"

159°

2019

Her

16^h08^m54.75^s / +45°21'11.80"

8^m.2

13^m.8

8.9"

102°

2015

9^m.5

13^m.8

9.0"

102°

2007

René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 107x ist Komponente B südlich von A knapp getrennt erkennbar - Helligkeitsunterschied eine knappe Größenklasse, dadurch wirkt B nicht ganz so reinweiß wie A
Mark McCarthy Fremont (California/USA)	203mm (205x)	AB: ! Blue-white A and white-blue B (which is to say A is white with a tinge of blue, and B is blue with a tinge of white) ~3", ~2 delta mag
Karsten Kopp Köln (Germany)	600mm (180x)	AB: Doppelstern ist gut zu trennen. Der Helligkeitsunterschied ist merklich, aber nicht markant. Der hellere leuchtet weißlich und der schwächere eher gelblich.

TDS9780

11^m.3

11^m.7

0.9"

47°

1991

CrB

16^h10^m19.66^s / +35°05'56.40"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

B star shows itself only with averted vision. Very faint. Tight but well split

STT307

7^m.7

10^m.7

17.5"

201°

2015

Her

16^h10^m31.74^s / +47°48'25.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange and very wide 3 delta mag B

★

STF2025

8^m.0

9^m.8

2.6"

164°

2015

Her

16^h11^m11.71^s / +47°33'36.10"

René Merting Drachhausen (Germany)	100mm (107x)	bei 107x wird mit viel Konzentration Komponente B südlich von A ganz knapp getrennt und wie ein Schatten bzw. wie eine zarte Andeutung erkennbar - bei 142x habe ich vergeblich versucht, B noch einmal zu erblicken - schwer
Mark McCarthy Fremont (California/USA)	203mm (205x)	! Very delicate pair, large delta mag, close ~2", B held with direct vision after foveal coaxing. Not far away is another bright white star about same magnitude as A, but is not paired with it
Mark McCarthy Fremont (California/USA)	317mm (553x)	Unrelated wide near equal white pair split in finder, but one has a very faint ~2 delta mag 2-3" companion and is the AB pair. Nice!
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern konnte gut getrennt werden. Beide Komponente wirken weißlich.

STT305

6^m.4

10^m.2

5.7"

263°

2017

CrB

16^h11^m39.60^s / +33°20'33.80"

6^m.4

13^m.0

27.8"

264°

1847

Mark McCarthy Fremont (California/USA)	317mm (553x)	AB: Orange star and faint blue B, wide.
René Merting Drachhausen (Germany)	320mm (144x)	bei 144x ist B hauchzart westlich neben der intensiv gelblich strahlenden A-Komponente erkennbar - Helligkeitsunterschied … riesig bzw. nicht abschätzbar - es hat ein wenig gedauert, bis ich B entdeckt habe, dann aber war es relativ leicht
Mark McCarthy Fremont (California/USA)	508mm (667x)	AB: Yellow orange and blue, wide, 2 delta mag Pretty. (Did not notice 13th mag AC)

STF2024

5^m.9

10^m.7

23.8"

45°

2019

Her

16^h11^m47.60^s / +42°22'28.20"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Pretty orange and blue wide pair, 3 delta mag. B almost blinks like a planetary nebula.
Karsten Kopp Köln (Germany)	600mm (180x)	Sehr einfacher Doppelstern. Hier liegt der Reiz im Helligkeitsunterschied beider Komponenten. Die Komponente A erstrahlt gelblich, während die Komponente B sich leicht bläulich zeigt.

HJ260

11^m.4

13^m.3

19.8"

27°

2015

CrB

16^h11^m50.72^s / +37°25'00.30"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Wide faint near equal

★

nu Sco, 14 Sco, Jabbah

BU120

4^m.3

5^m.3

1.3"

1°

2019

Sco

16^h11^m59.74^s / -19°27'38.30"

H5 6

4^m.3

6^m.6

41.3"

336°

2019

MTL2

6^m.6

7^m.2

2.4"

56°

2019

Christopher Hay Seeheim (Germany)	15x45	AC: Stabilised binoculars, handheld. Widely separated. Nice pair reminiscent of Beta Lyrae at 10x. Also split clearly in stabilised handheld 10x42, but view not as pleasing as in 15x45.
Christopher Hay Seeheim (Germany)	15x60	AC: Wide split. Secondary faint blue, a fine contrast to the very slightly yellowish-white primary.
René Merting Drachhausen (Germany)	18x70	AC: ein schönes Sternpaar mit einem leichten Farbkontrast - Komponente A im SSO ist leicht gelblich, die schwächere C-Komponente weißbläulich - A ist nicht ganz rund, aber das kann auch vom FG herrühren

STF2016

8^m.5

9^m.6

7.5"

147°

2019

Her

16^h12^m07.05^s / +11°54'39.20"

Only 11 arcminutes northwestward is the pretty bright planetary nebula IC4593.

Robert Zebahl Leipzig (Germany)	120mm (40x)	Conditions in the target region: SQM-L 20.6 Split at 40x with obvious difference in brightness. At 75x easily split.
Karsten Kopp Köln (Germany)	600mm (180x)	Leicht zu trennender Doppelstern. Beide Komponenten erstrahlen weißlich und deutlichem Helligkeitsunterschied.

STF2030

7^m.9

10^m.2

5.7"

239°

2018

Her

16^h12^m43.21^s / +40°46'54.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Nice yellowish pair, 3 delta mag, wide B

STF2022

6^m.5

10^m.0

2.5"

153°

2018

CrB

16^h12^m45.46^s / +26°40'14.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Nice tight split, ~2". Large delta mag. At 8" noticed the B star with averted vision but could hold

STF2028

9^m.9

9^m.1

0.5"

147°

2016

CrB

16^h12^m48.11^s / +39°21'35.60"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Nice delicate split with 445x, well split clean with 533x, white stars, ~1 delta, PA to SE. Grade 3 orbit, 105.34-year period, 0.519" now it's at apastron now and will sit there until 2050 when it will start close again in its nearly edge-on orbit

★

STF2021, 49 Ser

7^m.4

7^m.5

4.0"

358°

2019

Her

16^h13^m18.45^s / +13°31'37.20"

Robert Zebahl Leipzig (Germany)	70mm (57x)	Lovely split. Almost equal pair with relatively close components.
René Merting Drachhausen (Germany)	100mm (64x)	bei 32x zeigen sich zwei gleich helle weiße Sterne, die sich gerade noch berühren - bei 64x dann knappe Trennung, B ist nur minimal schwächer
Mark McCarthy Fremont (California/USA)	203mm (205x)	49 Ser. Light yellow orange, near equal, bright, wide ~4". Physical, 1354 year period
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist gut zu trennen, bei fast identischer Helligkeit. Ein weißliches Augenpaar schaut mich an.

A1642

8^m.9

9^m.4

0.8"

181°

2016

Her

16^h13^m43.62^s / +46°38'23.10"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Momentarily split with seeing, ~2 delta mag, <1". 188 year period

STF2029

8^m.0

9^m.6

6.0"

187°

2018

CrB

16^h13^m47.82^s / +28°43'55.90"

Mark McCarthy Fremont (California/USA)	203mm (205x)	Wide split, ~2 delta mag, pretty, faint pair.
Mark McCarthy Fremont (California/USA)	508mm (667x)	Slightly yellow and blue stars, wide
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist einfach zu trennen, bei einem Helligkeitsunterschied von 1,6 mag. Die heller Komponente A erstrahlt weißlich, während die Komponente B sich weißbläulich zeigt.

POP103

10^m.8

13^m.3

3.9"

52°

2019

CrB

16^h13^m59.63^s / +35°10'16.10"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

B star noticed & seen better averted vision but can hold direct. Wide split, 2 delta mag.

STF2023

8^m.7

9^m.4

1.8"

222°

2019

Her

16^h14^m30.89^s / +05°31'21.00"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Nice well split, almost 2 delta mag, light yellow stars. Spectral class F5, yellow-white. 18% parallax overlap and 216 AU separation, this is likely gravitationally bound

sigma CrB, 17 CrB, STF2032

5^m.6

6^m.5

7.2"

239°

2019

CrB

16^h14^m40.85^s / +33°51'31.00"

Robert Zebahl Leipzig (Germany)	16x70	2021-06-13: Clearly recognizable as a double star with a well visible difference in brightness. It appears clearly as '8' and is close to be separated.
Robert Zebahl Leipzig (Germany)	70mm (22x)	At 22x clearly separated, but very close with a clear difference in brightness. At 57x easy without any noticeable difference in color.
René Merting Drachhausen (Germany)	100mm (32x)	bei 20x zwei knapp zusammenstehende Sterne mit tiefer Einschnürung - bei 32x dann ein knapp getrenntes Pärchen - B-Komponente südwestlich gut eine halbe Größenklasse schwächer - beide Sterne mit weißem Brautkleid
Stefan Loibl Rosenheim (Germany)	102mm (26x)	Already split at 26x. Component A orange, B yellow.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein schick anzusehendes, knapp getrenntes Pärchen - A im Osten ist hellgelb - B ist vielleicht eine halbe Größenklasse schwächer und auch gelblich, aber nicht so stark wie A
Mark McCarthy Fremont (California/USA)	508mm (667x)	Sigma CrB. AB nice bright half delta mag wide. two more stars in system, one (AC) closer fainter, other (AD) further away.
Karsten Kopp Köln (Germany)	600mm (135x)	Sehr einfaches, auffälliges Objekt im Okular, ansonsten keine weiteren Auffälligkeiten.

STF2027

8^m.8

8^m.9

1.9"

81°

2019

Her

16^h15^m16.64^s / +04°15'46.60"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Tight but good split, near equal light yellow stars. Spectral class F0, yellow-white. 22% parallax overlap, 373 AU separation, likely to be gravitationally bound

STF2026

9^m.5

9^m.9

3.5"

16°

2019

Her

16^h15^m57.07^s / +07°21'24.80"

René Merting Drachhausen (Germany)	100mm (107x)	bei 64x sind die Sterne so schwach, dass ich hellere Sterne im Umfeld zum Fokussieren nutzen muss - beide Komponenten sind als 8 erkennbar, die Einschnürung ist aber nur in guten Momenten da - bei 107x dann gelingt die Trennung, B wirkt deutlich schwächer (in Wirklichkeit ist B nur 0m4 schwächer), aber vielleicht liegt es daran, dass die beiden Sterne ohnehin nur sehr schwach beobachtbar sind - das hat wenig Freude bereitet
Mark McCarthy Fremont (California/USA)	178mm (205x)	Wide, <1 delta mag white stars. 433.7911-year period it is approaching apastron. The AC pair is LEP 78 AC, sep 581.7 mag 9.48,17.49, discovered in 2000, which claims to be physical, however Gaia data shows there is no overlap in the parallax ranges and even the proper motions are divergent

ENG56, 15 Her

7^m.4

10^m.6

61.6"

252°

2019

Her

16^h15^m59.88^s / +11°25'30.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Orange and very wide 3 delta mag B. A 3rd star making a triangle, it is a triple system

★

COU1450

10^m.5

11^m.8

1.3"

59°

2013

Her

16^h16^m25.97^s / +43°25'25.50"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

! Very fine pair, slight mag difference, close ~2"

HJ584

10^m.2

13^m.5

15.4"

200°

2015

CrB

16^h17^m44.07^s / +39°14'25.00"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

A star is orange, B a little blue, faint. Good wide split, obvious.

HU661

10^m.4

10^m.6

0.8"

39°

2016

Her

16^h17^m45.01^s / +49°17'49.90"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Near equal white, noticeable mag difference, splits with seeing ~1"

ES1253

10^m.1

11^m.1

7.0"

232°

2015

Her

16^h18^m31.10^s / +45°10'33.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

~1 delta mag, wide, white

HU1172

10^m.0

10^m.1

1.7"

328°

2019

CrB

16^h18^m47.11^s / +31°53'51.00"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

nice near equal well spit pair, whitish yellow

STF2037

9^m.8

9^m.9

1.1"

256°

2017

Her

16^h18^m49.03^s / +17°23'58.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Very small elongated haze with two brightenings resolving to points with seeing.

KU52

10^m.1

11^m.5

9.5"

50°

2019

Her

16^h19^m44.39^s / +10°54'00.90"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

The B star is averted vision only, wide, 1 delta mag. 16% parallax overlap, 4,934 AU separation, with 2.18 solar mass, so likely to be gravitationally bound

TDS9841

12^m.5

13^m.3

2.6"

350°

1991

CrB

16^h19^m51.32^s / +27°27'38.50"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Very faint pair but with averted vision could notice and then hold direct. Half delta mag, wide

COU981

11^m.3

11^m.4

1.1"

132°

2015

CrB

16^h19^m55.21^s / +35°59'35.40"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Marginal with poor transparency and nearly full moon. It's a little too hazy to be sure, but there is certainly an elongation in that haze, or rather the haze is large enough to contain the two stars.

KUI72

5^m.5

10^m.0

2.1"

127°

1997

Her

16^h19^m55.24^s / +39°42'30.90"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Distinct faint point appears with perfect seeing ~2-3". Much smaller and fainter than A.

SHJ225

7^m.4

8^m.1

47.1"

333°

2018

Sco

16^h20^m05.49^s / -20°03'23.00"

René Merting

Drachhausen (Germany)

18x70

ein bequem getrenntes Sternpaar - Komponente B im NNW ist eine halbe Magnitude schwächer

TDS9846

10^m.8

11^m.9

2.2"

231°

1991

Her

16^h20^m07.51^s / +48°54'34.30"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Need averted vision to flash B out, can only see it this way. Wide ~3"

SHJ226

AB-C

7^m.6

8^m.3

12.6"

20°

2019

Sco

16^h20^m30.58^s / -20°06'51.80"

René Merting

Drachhausen (Germany)

18x70

ein genauer Blick lohnt sich, dann ist C knapp getrennt nordnordöstlich von AB erkennbar - interessant wird dieses Sternpaar im Zusammenhang mit dem nahe stehenden Doppelstern SHJ 225 - beide Sternpaare unterscheiden sich deutlich und stehen schön isoliert

STF2041

7^m.5

10^m.5

2.6"

1°

2010

Ser

16^h21^m47.96^s / +01°12'56.40"

Mark McCarthy

Fremont (California/USA)

178mm (205x)

Pretty tough, white A and nearly 3 delta mag yellow B, quite close, need seeing to settle. No parallax overlap

gamma Her, 20 Her

DRS58

2^m.9

8^m.1

8.3"

176°

2010

Her

16^h21^m55.24^s / +19°09'10.90"

SHJ227

3^m.8

10^m.1

43.3"

226°

2013

SHJ227

10^m.1

13^m.3

82.0"

298°

2015

Robert Zebahl Leipzig (Germany)	102mm (280x)	AD: It is already the second attempt at this double star. There was nothing perceptible at the best of intentions, which indicates a double star.
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Bright white and much fainter bluish B, wide separation.

★★

nu CrB, nu 1/2 CrB, 20 CrB

STFA29

5^m.4

5^m.6

354.7"

164°

2011

CrB

16^h22^m21.42^s / +33°47'56.90"

HN 81

5^m.4

12^m.6

68.1"

241°

2002

STFA29

5^m.4

11^m.5

277.1"

153°

2002

H6 18

5^m.6

11^m.5

98.2"

16°

2015

Christopher Hay Seeheim (Germany)	7x45	AB: A strong, well separated pair. Both orangish, Nu1 with a touch of yellow. Nicely framed in 8.6° FOV with globular cluster M13, which presents as a fluffy little ball under a NELM 5m2 sky.
René Merting Drachhausen (Germany)	18x70	AB: auffallend, zwei gleichhelle Sterne weit getrennt - die südliche Komponente strahlt zartgelb
Christopher Hay Seeheim (Germany)	101mm (51x)	AB: Extremely wide apart but still holding together very strongly thanks to identical, substantial brightnesses and identical yelowish-orange colours. Very impressive in 1.6° FOV.
René Merting Drachhausen (Germany)	320mm (72x)	AB: bei 72x ein weit auseinander stehendes helles Pärchen - die nördliche Komponente ist leicht heller - diesen Doppelstern macht die relativ gleiche hellgelbe Färbung beider Komponenten aus - was diesen Doppelstern noch ausmacht, dass beide hellen Komponenten einen schwachen Begleiter haben AC: bei 72x blinkt bei der nördlichen A-Komponente südwestlich ein schwacher Lichtpunkt auf, Abstand ordentlich BD: bei 72x steht bei der südlichen B-Komponente ein schwacher Lichtpunkt nordöstlich, D ist etwas weiter entfernt, als der Abstand AC - ein schickes Quartett
Mark McCarthy Fremont (California/USA)	508mm (667x)	STFA29 (AD): Nu 1 CrB. Nice bright orange finder split. AD is a wide faint star in the scope

PKO15

11^m.0

12^m.2

2.5"

32°

2015

CrB

16^h22^m38.86^s / +38°18'29.20"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

This is the fainter pair discussed in the last entry (KU 53). Faint, well split but closer. A star light orange, B bluish white. faint a bit hazy.

KU53

10^m.4

11^m.1

5.3"

49°

2017

CrB

16^h22^m54.07^s / +38°15'28.70"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Double-double in field, this is the equal pair brighter white, wide. The other (PKO 15) is faint, 1 to half delta mag, closer together.

H5 38

6^m.4

9^m.8

31.1"

16°

2015

CrB

16^h22^m56.50^s / +32°19'58.80"

René Merting

Drachhausen (Germany)

320mm (72x)

bei 72x ein sehr ungleiches Paar mit mindestens 2.5 Magnituden Helligkeitsunterschied - A strahlt weiß, B wirkt dagegen grau

STF2040

8^m.1

10^m.1

7.0"

313°

2018

Her

16^h23^m05.73^s / +13°50'23.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Slightly orange A, 3 delta mag B. Wide separation

STF2047

8^m.5

8^m.7

1.8"

325°

2019

Her

16^h23^m08.85^s / +47°37'48.40"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Bright light yellow-white stars, wide ~2"

★

BU951

AB-C

9^m.3

10^m.1

1.0"

30°

2016

CrB

16^h23^m32.23^s / +33°21'27.80"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Wow seeing is amazing getting airy disks 20 inch 667x, orange and blue stars, very nice split, dare I say wide (AB is near equal 0.1" pair, try again to notice out of round)

★★

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

4.4"

143°

2015

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!

STF2044

8^m.4

8^m.8

8.2"

341°

2017

CrB

16^h24^m10.41^s / +37°02'11.90"

Robert Zebahl Leipzig (Germany)	16x70	2021-06-13: Well visible as a double star, although it appears only elongated. The components seem to be similar bright.
René Merting Drachhausen (Germany)	100mm (32x)	bei 32x stehen die Sterne sehr dicht, aber schon getrennt sichtbar - Komponente B nordöstlich strahlt nur etwas schwächer, schätzungsweise eine halbe Größenklasse
Mark McCarthy Fremont (California/USA)	508mm (333x)	Nice orange and slightly blue stars, well split, near equal

★★

TDS9883

11^m.7

11^m.9

0.8"

299°

1991

CrB

16^h24^m38.78^s / +31°59'42.90"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Very extraordinarily fine, only at the best moments, a very close pair hairline split, very faint.

BU625, ome Her

4^m.6

11^m.8

25.4"

87°

2018

Her

16^h25^m24.93^s / +14°02'00.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Omega Her: Bright white and much fainter B, ~5 delta mag, wide.

★★★

rho Oph, 5 Oph

H2 19

5^m.1

5^m.7

3.0"

334°

2017

Oph

16^h25^m35.03^s / -23°26'47.00"

H2 19

5^m.1

7^m.3

149.2"

0°

2000

H2 19

5^m.1

6^m.8

156.4"

252°

2000

KOU63

5^m.8

11^m.7

4.8"

206°

2000

BU1115

6^m.8

8^m.4

0.3"

196°

2018

Stefan Loibl

Rosenheim (Germany)

102mm (102x)

AB: possible components (DE) and (CF) already visible at 27x magnification with ca. 2 arcmin distance

STF2049

7^m.3

8^m.1

1.1"

195°

2017

Her

16^h27^m54.63^s / +25°59'03.40"

Mark McCarthy Fremont (California/USA)	203mm (333x)	Suspected elongation at 205x, split clean at 333x. Blue B, dull white A, 1 delta mag. Nice!
René Merting Drachhausen (Germany)	320mm (320x)	bei 240x ist eine 8 erkennbar, beide Komponenten berühren sich noch gerade so - B im Süden ist nur unwesentlich schwächer - bei 320x dann knappe Trennung

★

STF2048

6^m.6

9^m.7

5.6"

297°

2015

Oph

16^h28^m48.99^s / -08°07'43.20"

6^m.6

12^m.7

130.6"

302°

2015

René Merting Drachhausen (Germany)	100mm (107x)	AB: schlechtes Seeing bzw. unerwartet heftiger Tanz der Sterne - erst bei 107x kann ich Komponente B ganz schwach west-nordwestlich von A erkennen - großer Helligkeitsunterschied - die Trennung hat keine Freude bereitet
Stefan Loibl Rosenheim (Germany)	102mm (102x)	AB: nice faint pair, both components orange

★

STF2052

7^m.7

7^m.9

2.5"

118°

2018

Her

16^h28^m52.67^s / +18°24'50.60"

7^m.7

11^m.8

141.4"

41°

2015

René Merting Drachhausen (Germany)	100mm (107x)	AB: bei 64x zwei gleichhelle Sterne, die sich gerade so berühren - bei 107x ein knapp getrenntes Pärchen, Komponente B im SO ist nur marginal schwächer
Stefan Loibl Rosenheim (Germany)	102mm (102x)	AB: Does not appear as a multiple star at 28x, elongated at 68x, splith with 102x. Component A blueish, B reddish. Observation of component C questionable. Occasional observation of a star at the presumably correct position.
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: Pretty pale yellow-orange pair of equal magnitude, about 2" separation.
Karsten Kopp Köln (Germany)	600mm (180x)	AB: Doppelstern war noch gut zu trennen, bei fast identischer Helligkeit. Komponente A wirkt weißlich, während die etwas schwächere Komponente B gelblich orange strahlt.

alpha Sco, 21 Sco, Antares, GNT1

1^m.0

5^m.4

3.2"

276°

2016

Sco

16^h29^m24.47^s / -26°25'55.00"

Mark McCarthy

Fremont (California/USA)

80mm (133x)

A shows as an airy disk with tremulous diffraction rings, but the very faint B star was steady within the diffraction ring. Current separation is 3.2" and its PA is to the west, which matched what I saw. A star is a bright orange, B is light green but faint

STF2051

7^m.7

9^m.4

13.8"

19°

2019

Her

16^h29^m25.06^s / +10°35'31.40"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32x ist Komponente B schwach nördlich von A erkennbar - Trennung eindeutig, nicht zu knapp - Helligkeitsunterschied 1.5 Größenklassen
Mark McCarthy Fremont (California/USA)	317mm (553x)	Orange and blue, wide separation, 2 delta mag.
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist einfach zu trennen. Helligkeitsunterschied beträgt etwas mehr als 1,5 mag und beide Komponenten erstrahlen weißlich gelb.

HO64

11^m.7

11^m.6

4.4"

109°

2017

Her

16^h30^m47.09^s / +27°46'38.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Faint but easily split & resolved pair, near equal, ~3-4". Not physical

★

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

★

STF2059

8^m.8

0.3"

179°

2016

Her

16^h30^m55.71^s / +38°03'52.60"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	nicht als DS gesehen
Mark McCarthy Fremont (California/USA)	317mm (553x)	Overlapping disks, notched. Need perfect seeing. This was 1.2" at Struve's discovery, so easier for him to see -- I doubt he would have found it now, near its closest separation. August 2017

SHJ233

7^m.1

8^m.3

59.2"

71°

2017

Her

16^h31^m30.62^s / +08°17'38.80"

René Merting Drachhausen (Germany)	16x70	ein weit getrenntes Pärchen mit zwei schwachen aber noch gut erkennbaren Sternen - Komponente B ist gut 1.5 Größenklassen schwächer - unspektakulär
René Merting Drachhausen (Germany)	100mm (20x)	bei 32x ein noch weiter auseinander stehendes Pärchen als der vorher beobachtete HV 127 gut 2,5° südöstlich - Komponente A weiß-gelblich, B um eine Größenklasse schwächer und weiß-grau

STF2056

7^m.8

9^m.2

6.8"

313°

2015

Her

16^h31^m38.54^s / +05°26'01.30"

René Merting Drachhausen (Germany)	100mm (32x)	bei 32 ist Komponente B knapp getrennt von A wahrnehmbar - der schwache Stern wirkt eher wie ein Schatten der Schatten von A - 64x ist dann besser und beide Sterne zeigen sich eindeutig getrennt - Helligkeitsunterschied 1.5 Größenklassen, dadurch wirkt B grau-braun gegenüber der weißlichen Komponente A
Mark McCarthy Fremont (California/USA)	508mm (205x)	Light yellow A and light orange B, ~2 delta, wide

STF2063

5^m.7

8^m.7

16.2"

196°

2019

Her

16^h31^m47.23^s / +45°35'53.80"

René Merting Drachhausen (Germany)	100mm (20x)	bei 32x zeigen sich beide Sterne mit ordentlichem Abstand - Komponente B gut 2 Größenklassen schwächer (laut Stelle Doppie sind es sogar 3 Größenklassen) - schöner Farbkontrast, B wirkt rostig braun gegen die warm-weiße Komponente A - zurück auf 20x sind beide Sterne gerade so getrennt erkennbar
Mark McCarthy Fremont (California/USA)	317mm (553x)	Bright white 2 delta mag B, wide
Karsten Kopp Köln (Germany)	600mm (180x)	Sehr einfach zu trennender Doppelstern mit einen deutlichem Helligkeitsuntschied von 3 mag. Beide Sterne leuchten weißlich.

★

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

STF2061

7^m.9

10^m.4

2.4"

29°

2015

Her

16^h33^m12.49^s / +30°54'27.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Bright white A, B is very faint. Finely resolved ~3-4", very significant mag difference

STF2068

9^m.0

9^m.1

4.9"

250°

2019

Her

16^h33^m54.99^s / +47°16'17.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Easy white and very lightly yellow B, ~10" and nearly equal mag

STF2062

9^m.1

10^m.6

2.4"

108°

2015

Her

16^h34^m44.14^s / +08°45'54.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

B pops into view with seeing, 2-3", 2 delta mag, very fine!

STF2072

9^m.8

10^m.6

5.0"

178°

2019

Her

16^h35^m33.34^s / +47°40'59.10"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Easy, ~1 delta mag, wide ~5", white

★★★

16/17 Dra

STFA30, 16/17 Dra

5^m.4

5^m.5

90.2"

193°

2018

Dra

16^h36^m13.72^s / +52°55'27.80"

STF2078, 17 Dra

5^m.4

6^m.4

3.3"

104°

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

STF2069

7^m.1

11^m.0

35.8"

82°

2015

Her

16^h36^m22.34^s / +33°49'18.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Light orange and slightly blue, 2 delta mag, very wide.

COU489

8^m.1

10^m.2

0.7"

332°

2016

Her

16^h36^m48.95^s / +26°31'55.80"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Suspected at 205x but used 333x for larger scale. B seen with great difficulty, averted vision only as a flash, <1". Light yellow bright A star

COU622

11^m.3

12^m.3

1.6"

304°

2007

Her

16^h36^m58.75^s / +29°03'56.90"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Easily split, if faint, near equal

A1643

10^m.4

10^m.7

0.8"

151°

2018

Her

16^h37^m36.00^s / +45°09'31.10"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Nicely split with seeing, <1 delta mag, <1" separation

STF2082, 42 Her

4^m.9

11^m.8

28.9"

92°

2014

Her

16^h38^m44.89^s / +48°55'41.80"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

42 Her: Bright orange pair 1 delta mag in finder. The brighter star has a 3-4 delta mag very faint bluish companion, wide separation, which is AB.

STT314

8^m.2

11^m.2

3.5"

236°

2017

Her

16^h38^m51.50^s / +20°27'57.60"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

B is blue and sharp with seeing, light yellow A is ~3 magnitudes brighter, ~4"

HU486

10^m.2

10^m.9

1.3"

165°

2016

Her

16^h39^m29.32^s / +22°43'59.70"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Very fine at this magnification, just split with seeing and just visible

COU414

10^m.9

11^m.1

1.7"

196°

2015

Her

16^h39^m34.88^s / +23°43'35.10"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Split with seeing but it's there, near equal white stars, very fine split

STF2079

7^m.6

8^m.1

16.7"

91°

2017

Her

16^h39^m36.33^s / +23°00'06.10"

Robert Zebahl Leipzig (Germany)	16x70	2021-05-31: Nicely separated, very striking. The double star is located at the northern edge of a prominent group of stars. The components appear slightly orange and light blue with a moderate difference in brightness. Colors changed between components during observation. Worthwhile.
René Merting Drachhausen (Germany)	18x70	zwei sehr dicht zusammenstehende Sterne, knapp getrennt - die B-Komponente im Osten ist nur ganz knapp schwächer - schön fürs Fernglas
René Merting Drachhausen (Germany)	100mm (20x)	bei 20x locker getrennt, aber richtig schön bei 32x, dann ein weit getrenntes Pärchen - Komponente B im Osten schätze ich gut eine halbe Magnitude schwächer als A ein - schöne Farbkombination, A ist gelblich-weiß, B ist zinnober
Mark McCarthy Fremont (California/USA)	152mm (175x)	Wide, white, near equal
Mark McCarthy Fremont (California/USA)	317mm (277x)	Wide separation, half delta mag. A is yellowish and B slight red tint
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein gut getrenntes Sternpaar, auffällig - B im Osten ist eine viertel Magnitude schwächer und strahlt graublau - A ist weiß, dadurch leichter Farbkontrast
Karsten Kopp Köln (Germany)	600mm (180x)	Einfacher Doppelstern mit geringem Helligkeitsunterschied. Beide Komponenten erstrahlen gelblich-weiß.

BU42

10^m.2

10^m.7

7.5"

41°

2018

Her

16^h40^m05.82^s / +29°00'41.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Significant magnitude difference, wide white stars

★

ES632

11^m.3

11^m.7

2.2"

104°

2015

Her

16^h40^m50.12^s / +50°13'40.60"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

! Very fine, noticeable magnitude difference, ~2", very nice

★

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

A349

10^m.7

10^m.9

0.7"

127°

2018

Her

16^h41^m17.67^s / +30°06'36.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

V908 Her. Elongation with averted vision, can't coax any better view. Light yellow. Physical, 135.69 year period

STF2091

8^m.4

9^m.3

0.4"

324°

2010

Her

16^h42^m09.74^s / +41°11'42.90"

Frederik Wanink Itterbeck (Germany)	254mm (640x)	nicht als DS gesehen
Mark McCarthy Fremont (California/USA)	317mm (553x)	I "see" rod shape once I know it is 0.4" separation. Marginal. (This one 1.3" at Struve's discovery, so easy for him! August 2017)

STF2085

7^m.4

9^m.2

6.0"

310°

2019

Her

16^h42^m26.09^s / +21°35'34.30"

René Merting Drachhausen (Germany)	100mm (64x)	bei 32x leuchtet nordwestlich am Stern etwas schwach, kann aber noch nicht getrennt werden - bei 64x sind dann beide Komponenten knapp getrennt erkennbar, B ist deutlich schwächer, etwa 2 Größenklassen - Farbkontrast A weiß / B grau
Mark McCarthy Fremont (California/USA)	152mm (175x)	2 delta mag, pretty wide
Mark McCarthy Fremont (California/USA)	317mm (277x)	Bright A a "ruddy" yellow orange. B about 2 magnitudes fainter, widely separated.
René Merting Drachhausen (Germany)	320mm (72x)	bei 72x ein schönes dicht zusammen stehendes Pärchen, Trennung etwas mehr als knapp - A ist weißgelb, B wirkt kupfergrau - schöner Farbkontrast

STF2087

8^m.8

8^m.9

5.1"

287°

2019

Her

16^h42^m34.83^s / +23°40'01.90"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Near equal orange, wide, ~5"
Karsten Kopp Köln (Germany)	600mm (180x)	Gut zu trennender Doppelstern mit sehr geringem Helligkeitsunterschied. Beide Komponenten erstrahlen gelblich-weiß.

SEI540

9^m.6

11^m.1

11.5"

227°

2015

Her

16^h42^m35.18^s / +31°12'58.30"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Pretty wide, ~2 delta pair

STF2083

9^m.1

9^m.6

12.8"

334°

2015

Her

16^h42^m44.12^s / +13°36'29.40"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Near equal wide.

STF2093, eta Her

3^m.6

11^m.7

116.6"

267°

2014

Her

16^h42^m53.76^s / +38°55'20.10"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Bright orange-yellow A, much fainter blue B, very wide separation

KU54

9^m.0

10^m.5

9.5"

99°

2017

Her

16^h42^m58.19^s / +43°54'40.20"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Yellow-white A and blue B, wide, ~2 delta

STTA149

7^m.2

8^m.4

96.2"

134°

2019

Her

16^h43^m30.10^s / +20°42'58.00"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Wide separation, white, A about 6th magnitude, B about 7th

H5 127

7^m.8

9^m.0

53.4"

294°

2016

Her

16^h43^m38.81^s / +06°37'06.80"

René Merting

Drachhausen (Germany)

100mm (20x)

bei 20x weit getrennt - bei 32x eine gelblich strahlende Komponente A im Osten, B westlich ist gut 1.5 Größenklassen schwächer und strahlt folgerichtig nur gräulichbraun

D15

9^m.0

9^m.3

0.6"

335°

2016

Her

16^h43^m56.29^s / +43°28'31.20"

Mark McCarthy Fremont (California/USA)	317mm (553x)	Light orange elongated, with notch, near equal. (0.9" at discovery).
Mark McCarthy Fremont (California/USA)	508mm (333x)	Close split with seeing, slight mag difference, ivory white stars

ES76

10^m.8

11^m.3

2.6"

45°

2018

Her

16^h44^m01.74^s / +50°36'21.30"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Near equal, well separated, ~2-3". There's a bluish plus one star widely separated to the south west (AC, 10.77/11.07 43.8")

★

STF2094

7^m.5

7^m.9

1.0"

76°

2018

Her

16^h44^m10.57^s / +23°31'02.80"

7^m.5

11^m.7

24.9"

312°

2015

Mark McCarthy Fremont (California/USA)	152mm (285x)	AB: Snowman at 175x, hairline split at 285x. Noticed wide faint C (11.70 mag) at 285x
Mark McCarthy Fremont (California/USA)	203mm (333x)	AC: Wide separation, 1 delta mag, 333x (AC seen, missed the tight A pair 1")
Mark McCarthy Fremont (California/USA)	317mm (277x)	AB: White-orange pair of equal magnitude, clean split when the seeing stills
Mark McCarthy Fremont (California/USA)	317mm (277x)	AC: ~25" separated, bluish about 3 magnitudes fainter than A
René Merting Drachhausen (Germany)	320mm (320x)	AB: bei 320x sind beide Komponenten knapp getrennt voneinander erkennbar - sie sind etwa gleich hell

STF2097

9^m.4

9^m.6

1.9"

80°

2018

Her

16^h44^m47.22^s / +35°44'16.70"

Mark McCarthy Fremont (California/USA)	178mm (205x)	Fine slight delta pair, well split. No parallax overlap
Mark McCarthy Fremont (California/USA)	317mm (553x)	Four stars in the system, one pair split in 50mm finder but one of these, AB, is a near equal close pair ~2-3"

STT585, 41 Her

6^m.7

10^m.4

163.1"

191°

2015

Her

16^h44^m59.98^s / +06°05'17.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

41 Her: Orange with very much fainter wide B.

★

STF2095

7^m.4

9^m.2

5.3"

160°

2015

Her

16^h45^m05.23^s / +28°21'28.90"

Mark McCarthy Fremont (California/USA)	152mm (175x)	Rather wide, 1 delta mag stars, yellow color A
Mark McCarthy Fremont (California/USA)	317mm (553x)	Nice! Yellow and white pair, 2 delta mag, 4"

STF2098

8^m.8

9^m.6

14.3"

145°

2015

Her

16^h45^m43.47^s / +30°00'17.20"

8^m.8

65.9"

128°

2015

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

STF2101

7^m.5

9^m.4

4.1"

47°

2015

Her

16^h45^m48.14^s / +35°37'50.50"

René Merting Drachhausen (Germany)	100mm (107x)	bei 64x ist Komponente B noch ein verwischtes Anhängsel an A - bei 107x zeigt sich B dann knapp getrennt von A und deutlich schwächer
Mark McCarthy Fremont (California/USA)	152mm (175x)	Fine white pair, 1 delta mag, well separated B
Mark McCarthy Fremont (California/USA)	178mm (205x)	Nice 2 delta wide pair, white A star and blue B. 4% parallax overlap and 243 AU separation, however the escape velocity exceeds the radial velocity delta, so it will not remain gravitationally bound
Mark McCarthy Fremont (California/USA)	203mm (333x)	Orange-yellow stars well separated ~2 delta mag.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow and a deeper yellow. There's an anonymous pair just west of STF 2101, a faint orange pair, looks like a 2+1 system.
Karsten Kopp Köln (Germany)	600mm (180x)	Gut zu trennender Doppelstern, mit auffälligem Helligkeitsunterschied von knapp 2 mag. Komponente A erstrahlt weiß und Komponente B gelblich orange.

SHJ239, 43 Her

5^m.3

9^m.3

84.1"

229°

2016

Her

16^h45^m49.89^s / +08°34'57.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

43 Her: Bright orange and 4x fainter B, very wide separation.

ES969

11^m.0

11^m.4

2.8"

238°

2015

Her

16^h46^m10.27^s / +50°11'12.90"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Plainly seen equal bluish stars, ~3"

AG351

10^m.3

10^m.7

3.0"

304°

2017

Her

16^h46^m16.28^s / +24°37'33.20"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Pretty, near equal pair, 3" separated, light orange stars. In an asterism which looks like Orion, with these two forming a belt. (Surprise, this isn't physical)

★

CTT20 & ES1089

ES1089

10^m.7

11^m.7

11.8"

150°

2015

Her

16^h46^m28.63^s / +47°59'24.00"

ES1089

10^m.7

12^m.7

32.4"

29°

2015

CTT20

10^m.7

10^m.8

71.1"

127°

2015

CTT20

10^m.8

12^m.5

27.2"

126°

2015

CTT20

12^m.5

12^m.7

34.5"

34°

2015

René Merting Drachhausen (Germany)	320mm (72x)	DE: bei 72x sind 5 Sterne der Herkules-Box (Leiter 6) getrennt voneinander erkennbar, u.a. auch die beiden Komponenten D und E - Komponente E bildet die südliche Ecke der Box, D liegt nahe E auf der Geraden zwischen A und E EF: bei 40x zeigt sich der Herkules-Box noch als nebliger Strich - bei 72x ist Komponente E getrennt nordöstlich von Komponente E zu erkennen - F bildet die nordöstliche Ecke des Rechtecks
René Merting Drachhausen (Germany)	320mm (160x)	AB: bei 160x wird die Herkules-Box (Leiter 6) sehr deutlich, ES 1089 zeigt sich als schön getrenntes Sternpaar im NW AC: das einzige physikalische Doppel in dieser Sechser-Gruppierung - bei 72x können die beiden Komponenten getrennt gesehen werden, sie bilden die westliche kurze Kante des Musters Leiter 6
Mark McCarthy Fremont (California/USA)	508mm (333x)	ES1089 (AB): ! Nice little cluster of six near same magnitude stars with a couple fainter mixed in, this one the faintest pair and closest in, ~2", ~1 delta. Not physical

TDT82

11^m.4

0.6"

356°

1991

Her

16^h46^m45.43^s / +27°05'26.90"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Tough, seeing and transparency not quote good enough. Suspected elongation at 333x and 667x showed one star pretty clearly but only a haze and elongation where fainter B was.

A227

10^m.5

2.1"

237°

2016

Her

16^h46^m56.49^s / +27°00'59.20"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Easy near equal pair, light orange, 2"

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

214.1"

193°

2015

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

HU666

9^m.3

13^m.1

0.5"

226°

2008

Her

16^h47^m23.01^s / +23°00'06.20"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

When A star settles down to a disk, the B star is an unresolved haze in the diffraction ring, very faint.

WEI31

9^m.9

10^m.1

5.0"

317°

2018

Her

16^h47^m35.08^s / +25°38'21.60"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

AB, AC, BC: Two plus one system, the two closest AB nearly equal, AB a little fainter. White to yellowish white. Well separated all of them, surprised Struve missed them

TDS836

10^m.3

11^m.1

2.6"

218°

2017

Her

16^h47^m35.42^s / +31°29'15.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Faint but fine pair, noticeable mag difference, about half delta mag, nicely split ~2"

BUP174, 45 Her

5^m.2

11^m.2

121.2"

80°

2010

Her

16^h47^m46.43^s / +05°14'48.60"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Bright A and very much fainter B, wide separation.

STF2104

7^m.5

8^m.8

5.7"

18°

2018

Her

16^h48^m41.48^s / +35°55'19.30"

René Merting Drachhausen (Germany)	100mm (64x)	bei 64x zwei dicht zusammen stehende aber gut getrennte Sterne - Komponente B nordöstlich ist deutlich schwächer als A
Mark McCarthy Fremont (California/USA)	152mm (175x)	White pair, 1 delta mag, wide
Mark McCarthy Fremont (California/USA)	178mm (205x)	Ice blue-white A and light red B, 2 delta, wide. WDS uncertain but there is 67% parallax overlap and 1,114 AU separation, with the primary 2.45 and secondary 1.73 solar mass -- very likely to be gravitationally bound
Mark McCarthy Fremont (California/USA)	203mm (333x)	White A and slightly blue B, well separated, 2 delta mag.
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern ist gut zu trennen und beide Sterne erstrahlen gelblich weiß.

★★

52 Her

A1866

9^m.5

9^m.6

0.3"

266°

2012

Her

16^h49^m14.20^s / +45°59'00.40"

BU627

A-BC

4^m.8

8^m.4

2.2"

44°

2018

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"

★★

STF2103

5^m.9

10^m.0

4.9"

43°

2018

Her

16^h49^m34.67^s / +13°15'40.30"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Nice! Pretty bright white A, much fainter 5 delta mag B, well separated, looks like a planet.

★★

STF2107

6^m.9

8^m.5

1.5"

109°

2018

Her

16^h51^m50.10^s / +28°39'58.70"

Mark McCarthy Fremont (California/USA)	152mm (175x)	! Extremely fine hairline split with seeing, 1.5 delta mag white stars. Obvious split with 285x. Physical with a 274 year orbit, now at apastron. 1.1" at discovery in 1828
Mark McCarthy Fremont (California/USA)	317mm (553x)	Yellow and orange pair, very close ~1.5", 1 delta mag. Very pretty.
Mark McCarthy Fremont (California/USA)	508mm (667x)	Nice pair yellow and slightly blue two delta mag, about 1.5" (AC is 11.5 and much further separated)
Karsten Kopp Köln (Germany)	600mm (385x)	Doppelstern ist bei 180-facher Vergrößerung gerade so als 8 zu erkennen. Bei 385-facher Vergrößerung in den seltenen Augenblicken des ruhigen Seeings gerade so eben zu trennen. Sehr schwierig auch wegen des Helligkeitsunterschied von 1,6 mag.

★

BU821

9^m.8

10^m.5

1.3"

324°

2016

Her

16^h51^m50.65^s / +31°50'36.30"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

! Nice, exceedingly fine split at this low magnification, noticeable mag difference, white stars. Burnham discovered with 15.5-inch Washburn

ROE3

10^m.8

11^m.2

6.1"

21°

2015

Her

16^h52^m07.27^s / +30°05'09.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Almost need averted vision for B, ~1 delta mag, ~5"

BU1454, 53 Her

5^m.4

12^m.5

75.4"

64°

2014

Her

16^h52^m58.12^s / +31°42'06.20"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

Brighter yellow-orange and much fainter bluish B, ~4 delta mag, very wide.

STF2109

7^m.5

10^m.3

5.9"

312°

2018

Her

16^h53^m45.78^s / +21°10'22.60"

Mark McCarthy Fremont (California/USA)	152mm (175x)	Wide, faint, near orange star
Mark McCarthy Fremont (California/USA)	203mm (205x)	Well separated, around 2 delta mag. Surprisingly interesting pair.
Mark McCarthy Fremont (California/USA)	508mm (667x)	Yellow A and very light blue three delta mag wide separation B.

A350

9^m.5

9^m.6

0.6"

144°

2017

Her

16^h53^m59.79^s / +29°06'23.50"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Snowman at best moments, slight mag difference. Seeing not permitting higher magnification

BRT341

11^m.4

11^m.6

4.2"

254°

2019

Her

16^h54^m03.47^s / +43°54'49.30"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Near equal, wide, bluish

FOX196, 54 Her

5^m.5

12^m.5

88.4"

318°

2015

Her

16^h55^m22.24^s / +18°25'59.50"

Mark McCarthy

Fremont (California/USA)

317mm (553x)

54 Her: Very faint, averted vision only B, pretty wide split to west.

TDT152

12^m.0

12^m.1

0.8"

89°

1991

Her

16^h56^m17.57^s / +18°52'04.20"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Discovered in 1991. Well split and resolved, fairly faint, slight mag difference.

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°

2015

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"

BRT172

10^m.2

11^m.5

4.7"

217°

2019

Her

16^h56^m45.14^s / +27°33'31.00"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Wide ~5", ~1 delta mag. B nearly needs averted but I can just hold it direct

LDS986

10^m.7

10^m.8

8.5"

266°

2018

Her

16^h56^m46.43^s / +25°41'02.00"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Physical pair. Wide separation, near equal pretty bright white stars

HEI71

10^m.4

11^m.4

1.3"

253°

2015

Her

16^h56^m53.03^s / +15°40'10.80"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Close pair but easily split, light yellow stars, one delta mag.

STT340

8^m.4

9^m.2

31.4"

221°

2015

UMi

16^h57^m18.06^s / +86°50'40.10"

René Merting

Drachhausen (Germany)

100mm (20x)

bei 32x ein feines schwaches Sternpaar, mehr als ordentlich getrennt - Komponente A ist creme-weiß, B wirkt grau und ist gut eine halbe Größenklasse schwächer - zurück auf 20-fach sind beide Sterne ebenfalls problemlos erkennbar, die Trennung ist weiterhin ordentlich

BRT2426

11^m.8

12^m.0

4.2"

307°

2015

Her

16^h57^m24.72^s / +21°29'40.10"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Near equal easy pair, wide. Not physical

A1872

9^m.6

10^m.7

1.1"

119°

2016

Her

16^h57^m47.31^s / +43°43'52.00"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Very nice white pair, >1 magnitude difference, nicely split ~1"

STT320

8^m.5

11^m.8

5.8"

252°

2018

Her

16^h58^m12.20^s / +25°20'18.60"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

White A, slightly orange B, wide, significant magnitude difference

STF2112

9^m.7

10^m.3

2.1"

263°

2018

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

TDT163

11^m.5

12^m.4

1.2"

276°

1991

Her

16^h58^m31.13^s / +23°50'35.70"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

I can pick up both stars within a haze using averted vision, one is noticeably fainter than the other. Suspect elongation with direct vision.

TDS846

9^m.7

11^m.7

1.3"

76°

2015

Her

16^h58^m36.45^s / +26°37'00.90"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

Split very briefly at finest moment, after a lot of shimmer. Near equal to half a delta mag.

BU1298

8^m.2

9^m.6

0.4"

132°

2016

Oph

16^h59^m29.54^s / +09°42'12.30"

Mark McCarthy

Fremont (California/USA)

508mm (445x)

Nicely split, white stars, about 1 delta mag. WDS uncertain, and frustratingly Gaia lacks data on primary. Burnham discovered with the Yerkes 40-inch in 1901 at 0.3" and called it "a close and difficult double."

HU1279

10^m.4

11^m.7

1.6"

156°

2015

Her

16^h59^m44.52^s / +13°19'03.00"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

very faint, some haze, but at best moments resolved to two points in the elongated haze.

STT322

7^m.9

10^m.2

1.4"

204°

2016

Her

16^h59^m46.42^s / +36°55'17.00"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

For certain can see it with 20" at 333x, but the star images are bloated due to seeing. The 8" inch mask cleans the image up but the B star is considerably fainter. 3-4 delta mag 1.5" with 333x in 8 inch. B star looks blue.

A1875

8^m.7

10^m.8

2.4"

189°

2016

Her

17^h00^m14.17^s / +43°45'15.20"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Very faint B ~3 delta mag, well separated ~3", with seeing

ES1255

8^m.2

11^m.7

7.6"

46°

2015

Her

17^h01^m00.54^s / +46°16'26.80"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

A is bright light orange and B can only be seen with averted vision--but quite plainly there while averted. I cannot get it to appear direct or with foveal coaxing

H4 122, V451 Her

6^m.3

10^m.3

18.9"

238°

2015

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

J739

9^m.1

10^m.5

2.8"

159°

2016

Her

17^h01^m41.52^s / +34°59'02.30"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

I sensed elongation with the 8 inch mask at 333x, but it was a haze only flashing elongation with averted vision. With the 20 inch the a star resolved, orange, and the B was noticed at 3" but was considerably fainter, I would guess 1.5 to 2 delta mag.

J740

10^m.2

10^m.9

2.8"

224°

2017

Her

17^h03^m14.59^s / +34°58'55.60"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Well spilt, obvious at 20" 333x light orange and yellow stars.

STF2128

8^m.8

10^m.3

12.2"

43°

2018

Dra

17^h03^m18.66^s / +59°35'07.30"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Wide stars, light orange, ~2 delta mag. 1200 year period

STFA33

5^m.9

6^m.2

304.9"

117°

2014

Her

17^h03^m39.31^s / +13°36'19.50"

Mark McCarthy

Fremont (California/USA)

80mm (13x)

80mm finder split, equal white.

★★

BU822

6^m.6

9^m.9

1.4"

227°

2010

Her

17^h03^m52.67^s / +19°41'25.80"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

Bright orange star with a consistent pin-prick point of light, stays still in occasional seeing shimmer. Fainter than PRY 2's B. ~1.5". In same field as PRY 2, same PA as PRY 2's.

ES634

10^m.8

11^m.6

2.1"

93°

2015

Her

17^h04^m00.87^s / +42°11'46.90"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Half delta mag, well split white orange and light orange stars

COU1593

10^m.6

10^m.4

0.6"

191°

2016

Her

17^h04^m16.61^s / +44°44'43.00"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Notched elongation, with seeing, slight mag difference

TDS850

10^m.9

11^m.3

1.4"

205°

2015

Her

17^h04^m25.61^s / +27°50'55.50"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

B needed to flash with averted vision at first, and the best I can get is a hazy elongation, <2"

★★

PRY2

6^m.2

9^m.3

1.8"

227°

2012

Her

17^h04^m41.34^s / +19°35'56.70"

Mark McCarthy Fremont (California/USA)	152mm (175x)	! Wow! 3 delta mag B star just outside blue-green A's diffraction ring. Seen at both 175x and 285x. J.J.M. Perry. Uncertain in WDS, but from the Gaia EDR3 data I find a 23% parallax overlap, 2030 AU weighted distance, with the primary star 3.31 primary star solar mass vs 1.61 for the secondary -- so it should bind at 2030 AU -- so it is likely gravitationally bound. Gaia lacks the radial velocity otherwise I could confirm it
Mark McCarthy Fremont (California/USA)	317mm (277x)	Blue-white and slightly reddish B, 3-4 delta mag, 1.5". Not hard at all! Makes a double-double with BU 822 at 277x

STF2120

7^m.4

9^m.2

24.5"

231°

2015

Her

17^h04^m45.80^s / +28°05'27.70"

7^m.4

10^m.4

144.8"

174°

2015

René Merting

Drachhausen (Germany)

100mm (32x)

AB: bei 32x steht B gut abgesetzt im Südwesten von A und ist gut 2 Größenklassen schwächer - A ist weiß, B wirkt grau - ein unauffälliges Paar

STT323

8^m.4

11^m.4

11.2"

79°

2015

Her

17^h05^m05.49^s / +46°58'01.70"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Easy yellow-white A and ~3 delta B, wide. Not physical

★★

mu Dra, 21 Dra, Alrakis, Arrakis

STF2130

5^m.7

2.5"

2°

2018

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

TDT212

11^m.3

11^m.4

1.2"

132°

2019

Her

17^h05^m57.90^s / +46°15'53.60"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint elongation splits with seeing, near equal pair

STF2119

8^m.2

8^m.3

2.4"

185°

2017

Oph

17^h06^m29.45^s / -13°56'05.50"

René Merting

Drachhausen (Germany)

76mm (95x)

bei 95x ein ganz enges, ungetrenntes Sternpaar in Nordsüd-Ausrichtung - auch bei 127x in ruhigen Momenten maximal eine leicht längliche Erscheinung mit leichter Einschnürung

STF2122

6^m.4

9^m.7

20.3"

279°

2015

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.

A1644

10^m.4

11^m.6

2.3"

211°

2009

Her

17^h07^m47.13^s / +47°27'16.00"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Bluish, faint, slight mag difference, well split ~3"

★

STT324

6^m.0

10^m.7

3.6"

222°

2016

Her

17^h08^m00.70^s / +31°12'22.50"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Very interesting. At 20 inch the a star was orange and bloated with the seeing, did not notice a pair. I used the 8 inch mask which tightened the A star up considerably, then with averted vision could discern a very faint small glow in one particular direction, but could not hold it direct. Back to the 20" and now in good moments I can see the B star quite well, 5 delta mag, bluish. 333x

A1145

6^m.3

7^m.8

0.7"

340°

2018

Oph

17^h08^m13.65^s / -01°04'46.10"

Mark McCarthy

Fremont (California/USA)

203mm (667x)

Marginal observation of a very faint, very close-in star which briefly resolves as a point and not a flare.

SLE80

11^m.3

11^m.5

15.0"

294°

2015

Her

17^h08^m24.40^s / +46°55'55.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

Faint near equal, wide. Not physical

STF2133

9^m.7

10^m.7

3.4"

198°

2019

Her

17^h08^m41.83^s / +49°45'19.30"

Mark McCarthy

Fremont (California/USA)

203mm (333x)

~2 delta mag, wide ~5"

STF2129

10^m.0

10^m.6

9.8"

206°

2015

Dra

17^h08^m51.86^s / +69°25'10.40"

Mark McCarthy

Fremont (California/USA)

152mm (175x)

Wide and 2 delta mag B. Not physical

SLE79

12^m.1

12^m.3

9.0"

219°

2015

Her

17^h09^m09.66^s / +33°41'32.50"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

12th mag pair not so difficult when widely separated like this. Light orange near equal stars very widely split. Forms a triangle with two other stars. (not a physical pair)

TDT236

11^m.4

11^m.6

0.7"

24°

1991

Her

17^h09^m19.96^s / +33°38'32.20"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

At very best moments which last just a second, can see the hazy elongation resolve into hairline split. Unequal by a mag. I dare not try higher power. This was one of the triangle stars mentioned in the SLE 79 entry.

eta Oph, 35 Oph

BU1118

3^m.0

3^m.3

0.5"

228°

2019

Oph

17^h10^m22.66^s / -15°43'30.50"

BU1118

AB-C

2^m.4

12^m.3

99.8"

148°

2012

BU1118

2^m.4

11^m.2

101.2"

281°

2012

DAL52

2^m.4

11^m.1

62.7"

317°

2012

Stefan Loibl

Rosenheim (Germany)

102mm (205x)

B component recognizable in the airy disk, E component not visible

SHY713

6^m.2

7^m.0

195.5"

74°

2015

Her

17^h11^m03.17^s / +24°14'15.40"

Mark McCarthy

Fremont (California/USA)

317mm (277x)

80mm Finder split. within half magnitude of each other, yellow-orange, color more apparent at 277x.

★

STF2142

6^m.2

9^m.3

4.9"

110°

2018

Her

17^h11^m40.26^s / +49°44'46.70"

René Merting Drachhausen (Germany)	100mm (64x)	bei 64x offenbart der Stern seine Doppelsternseele - östlich von Komponente A ist knapp getrennt ein ganz schwacher Lichtpunkt sichtbar - gut 3-4 Größenklassen Unterschied zwischen den beiden - ein ungleiches Paar, aber schön anzusehen
Mark McCarthy Fremont (California/USA)	203mm (205x)	White star and ~3 detla mag, well separated, a little reddish color
Karsten Kopp Köln (Germany)	600mm (180x)	Doppelstern konnte gut getrennt werden. Der Reiz bei diesem Doppelstern liegt bei dem sehr deutlichen Helligkeitsunterschied von über 3 mag. Komponente A erstrahlt weißlich und Komponente B leicht rötlich.

SLE11

11^m.4

12^m.3

9.2"

286°

2019

Her

17^h11^m46.73^s / +29°05'42.80"

Mark McCarthy

Fremont (California/USA)

203mm (205x)

Easy wide near equal. Not Physical

STF2135

7^m.6

8^m.9

8.7"

195°

2018

Her

17^h12^m06.06^s / +21°13'44.40"

7^m.6

12^m.9

162.1"

208°

2015

René Merting Drachhausen (Germany)	100mm (32x)	AB: bei 64x ein locker getrenntes Pärchen - Komponente B im Süden halb so hell wie A - zurück auf 32x sind beide Sterne als enges Pärchen erkennbar, nicht zu knapp getrennt - noch weiter zurück auf 20x sehe ich ein längliches Sternchen, Trennung bei dieser Vergrößerung noch nicht möglich
Mark McCarthy Fremont (California/USA)	203mm (667x)	AB: Pretty yellow star with widely separated 2 delta mag bluish B. (Not physical)

KUI79

10^m.0

10^m.2

0.3"

146°

2016

Her

17^h12^m07.78^s / +45°39'57.60"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Fine split ~1", noticeable mag difference. 12.91 year period!

WFC189

10^m.0

10^m.6

6.6"

302°

2019

Her

17^h12^m11.20^s / +21°36'39.20"

Mark McCarthy

Fremont (California/USA)

203mm (667x)

Faint near equal half delta mag blush stars, wide

ALI604

9^m.7

11^m.9

11.3"

176°

2017

Her

17^h12^m57.15^s / +36°56'17.70"

Mark McCarthy

Fremont (California/USA)

508mm (333x)

Orange and slight blue well separated, 2 delta mag.

TDS857

11^m.5

12^m.4

1.1"

198°

1991

Her

17^h13^m03.99^s / +35°58'43.00"

Mark McCarthy

Fremont (California/USA)

508mm (667x)

VZ Her.Tough, faint pair averted brightens the elongated haze, when seeing stills there are points very tight 1"

STF2146

6^m.9

8^m.8

2.8"

225°

2018

Dra

17^h13^m06.26^s / +54°08'20.90"

7^m.0

8^m.9

89.3"

235°

2016

René Merting

Drachhausen (Germany)

100mm (32x)

AC: bei 32x zeigt sich Komponente C komfortabel getrennt südwestlich von A - Helligkeitsunterschied eine Magnitude (1.92 mag laut Stelle Doppie) - auf B leider nicht geachtet und bei 107x auch noch nicht erkannt

STF2137

9^m.2

10^m.0

4.1"

145°

2017

Her

17^h13^m53.67^s / +15°57'03.20"

Mark McCarthy Fremont (California/USA)	203mm (667x)	V655 Her. B pretty faint, wide separation, white stars.
Mark McCarthy Fremont (California/USA)	317mm (553x)	Easy if faint pair, 1 delta mag, 4"

BU44

9^m.2

9^m.7

5.6"

18°

2018

Her

17^h13^m55.16^s / +28°48'09.00"

Mark McCarthy

Fremont (California/USA)

203mm (667x)

Two plus one system, the closest (AB) 1 delta mag, the further pair (AC) fainter still. wide all (Not physical)

★★

HO557, AK Her

8^m.6

12^m.0

4.5"

323°

2015

Her

17^h13^m57.81^s / +16°21'01.00"

Mark McCarthy Fremont (California/USA)	317mm (553x)	B only visible with averted vision. As I drift from averted back to direct the star fades and I can only hold direct for a moment before it disappears. Very interesting effect. ~5" and 4 delta mag.
Mark McCarthy Fremont (California/USA)	508mm (205x)	AK Her. White A and much fainter orange B, interesting pair. It is an uncertain pair yet WDS shows a period of 58.8 years, +/- 8 years.

COU111

10^m.7

10^m.8

0.6"

245°

2008

Her

17^h13^m59.66^s / +21°19'10.00"

Mark McCarthy

Fremont (California/USA)

508mm (533x)

Clean, obvious split with apodising mask, not quite 1 delta mag. Suspected elongation with 205x & hairline with apodising mask at 333x. Very slightly orange-yellow stars.

STF2139

9^m.6

11^m.7

8.3"

335°

2015

Her

17^h14^m09.65^s / +19°18'43.10"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Easy wide pair, ~3 delta mag, both are very light orange though B is a deeper color since it's fainter. Not physical

HU488

9^m.7

11^m.2

2.9"

105°

2015

Her

17^h14^m29.61^s / +19°55'52.30"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Blue-white A and orange B, ~4", ~2 delta mag

★★

STF2140, alpha Her, 64 Her, Ras Algethi

3^m.5

5^m.4

5.0"

103°

2019

Her

17^h14^m38.86^s / +14°23'24.90"

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.
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

POU3265

11^m.8

13^m.0

3.9"

170°

2015

Her

17^h14^m44.25^s / +23°56'22.10"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

B seen with averted vision at first, and with some foveal coaxing I could hold it with direct vision. ~1 delta mag and ~3"

★★

STF3127, delta Her, 65 Her

3^m.1

8^m.3

13.7"

293°

2019

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.

SHJ243, 36 Oph

5^m.1

5.1"

140°

2018

Oph

17^h15^m20.78^s / -26°36'06.10"

5^m.1

6^m.5

731.6"

74°

2000

5^m.1

7^m.8

276.9"

338°

2000

5^m.1

12^m.3

38.2"

313°

2000

Stefan Loibl

Rosenheim (Germany)

102mm (68x)

Komponente AB separated at 68x magnification, componente C at greater distance of 12.2 arcmin

HU489

10^m.4

10^m.8

1.0"

36°

2015

Her

17^h15^m32.00^s / +20°06'56.80"

Mark McCarthy

Fremont (California/USA)

203mm (667x)

Elongation with eight inch mask but not split 667x

POU3271

10^m.2

10^m.5

3.3"

259°

2009

Her

17^h15^m49.60^s / +23°22'05.80"

Mark McCarthy

Fremont (California/USA)

508mm (205x)

Near equal, pretty wide ~4", light yellow stars. Not physical

POU3272

10^m.9

12^m.9

7.2"

211°

2015

Her

17^h15^m56.53^s / +24°13'39.40"