- Double Stars (Leo) -

And (32)	Cep (13)	CVn (4)	Her (13)	Mon (1)	Sex (2)
Aql (9)	Cet (1)	Cyg (19)	Hya (4)	Oph (1)	Tau (11)
Ari (8)	CMa (1)	Del (2)	Leo (19)	Ori (8)	Tri (4)
Aur (27)	Cnc (10)	Dra (8)	Lib (1)	Peg (16)	UMa (24)
Boo (12)	Com (8)	Equ (5)	LMi (6)	Per (18)	UMi (1)
Cam (10)	CrB (4)	Eri (1)	Lyn (18)	Psc (7)	Vir (6)
Cas (17)	Crv (1)	Gem (19)	Lyr (8)	Ser (2)

HU 1338 & STF1448 (**)

Name:	HU1338 & STF1448, WDS10344+2136
Type:	**
Constellation:	Leo
Coordinates:	10h34m23.24s / +21°35'36.40"

Components:
		m₁	m₂	ρ	θ	Year
HU1338	AB	7m5	13m6	3.5"	184°	1920
STF1448	AC	7m5	9m6	10.9"	259°	2011

Robert Zebahl
70mm f/5.7, 44x, Bortle 6 STF1448 (AC): 2020-04-10: Moderate separation, significant difference in brightness. A shows a beautiful bright orange, C as a faint greyish companion.

S 617 (**)

Name:	S617
Type:	**
Constellation:	Leo
Coordinates:	10h53m24.96s / -02°15'18.80"

Components:
		m₁	m₂	ρ	θ	Year
		6m2	8m7	35.2"	179°	2017

Robert Zebahl
70mm f/5.7, 22x, Seeing 3-4/5 2020-03-31: Clearly separated with distinct difference in brightness. Color wise unremarkable. Nearby there is a brighter star.

STF 1399 (**)

Name:	STF1399
Type:	**
Constellation:	Leo
Coordinates:	09h57m02.21s / +19°45'44.60"

Components:
		m₁	m₂	ρ	θ	Year
		7m7	8m4	30.2"	176°	2017

Robert Zebahl
70mm f/5.7, 22x Easy to split with nice distance and obviously unequal. A conspicuous group of fainter stars is nearby. Main component appeared in a warm-white, fainter somehow darker (partly bluish, partly slightly orange).

STF 1424 (**)

Name:	STF1424, gamma Leo, 41 Leo, Algieba
Type:	**
Constellation:	Leo
Coordinates:	10h19m58.35s / +19°50'29.40"

Components:
		m₁	m₂	ρ	θ	Year
	AB	2m4	3m6	4.9"	126°	2019



Robert Zebahl
55mm f/9.1, 38x, Bortle 6-, SQM-L 19.1 At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors.
55mm f/9.1, 59x, Bortle 6, SQM-L 19.5 Very nice unequal double. A appeared yellow-orange, B rather white-bluish.
70mm f/5.7, 100x, Bortle 6- At 67x still a relatively close pair, but well separated with quite a clear difference in brightness. At 100x easy to separate and visible color difference: A yellowish to slightly orange, B white-yellowish.
102mm f/11, 125x, Bortle 7, SQM-L 18.8, Seeing 3/5 Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
120mm f/5, 66x, Bortle 6-, SQM-L 19.1 At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.

STF 1426 (**)

Name:	STF1426
Type:	**
Constellation:	Leo
Coordinates:	10h20m32.32s / +06°25'47.60"

Components:
		m₁	m₂	ρ	θ	Year
	AB-C	7m3	9m4	7.6"	9°	2018
	AB	8m0	8m3	0.9"	313°	2018



Robert Zebahl
102mm f/11, 160x, Bortle 6- AB-C: Quite large angular distance and therefor easy to separate. The C component was pretty faint.
102mm f/11, 160x, Bortle 6- AB: At first glance elongated, on closer look visible as '8'.

STF 1431 (**)

Name:	STF1431
Type:	**
Constellation:	Leo
Coordinates:	10h25m35.12s / +08°46'35.40"

Components:
		m₁	m₂	ρ	θ	Year
		7m8	9m1	3.6"	76°	2019

Robert Zebahl
70mm f/5.7, 67x Separable at 67x, but very close together with a clear difference in brightness. Easy to separate at 100x. Next to it the star 44 Leo shines in a striking, bright orange.

STF 1447 (**)

Name:	STF1447
Type:	**
Constellation:	Leo
Coordinates:	10h33m47.28s / +23°21'02.40"

Components:
		m₁	m₂	ρ	θ	Year
		7m5	8m9	4.6"	124°	2019

Robert Zebahl
70mm f/5.7, 67x, Bortle 6 2020-04-10: With 44x very tight, uneven pair. The primary component appears whitish with a very faint companion. At 67x the faint companion is clearly visible, but still standing close to the primary component.

STF 1450 (**)

Name:	STF1450, 49 Leo
Type:	**
Constellation:	Leo
Coordinates:	10h35m02.16s / +08°39'01.60"

Components:
		m₁	m₂	ρ	θ	Year
		5m8	7m9	2.2"	156°	2017

Robert Zebahl
70mm f/5.7, 133x B component appeared as clear brightening on the first diffraction ring of the primary component in the correct position angle.

STF 1487 (**)

Name:	STF1487, 54 Leo
Type:	**
Constellation:	Leo
Coordinates:	10h55m36.80s / +24°44'59.00"

Components:
		m₁	m₂	ρ	θ	Year
		4m5	6m3	6.8"	112°	2019

Robert Zebahl
55mm f/9.1, 27x At 27x split, but very tight with noticeable difference in brightness. At 71x easy to separate. No visible color difference.

STF 1504 (**)

Name:	STF1504
Type:	**
Constellation:	Leo
Coordinates:	11h03m58.93s / +03°38'19.30"

Components:
		m₁	m₂	ρ	θ	Year
		7m9	8m1	1.2"	126°	2018

Robert Zebahl
70mm f/5.7, 133x, Seeing 3-4/5 2020-03-31: The double star might have appeared slightly elongated. But observation is too uncertain.
102mm f/11, 160x, Bortle 6, SQM-L 19.1, Seeing 4/5 2020-03-28: At 125x clearly visible as figure '8'. Both components appeared similarly bright. At 160x and 187x the diffraction disks were touching each other slightly.

STF 1517 & BU1431 (**)

Name:	STF1517 & BU1431, WDS11137+2008
Type:	**
Constellation:	Leo
Coordinates:	11h13m40.99s / +20°07'43.30"

Components:
		m₁	m₂	ρ	θ	Year
STF1517	AB	7m5	8m0	0.7"	314°	2017
BU1431	AB-C	7m5	10m8	246.1"	97°	2015



Robert Zebahl
102mm f/11, 187x, Bortle 6, SQM-L 19.1, Seeing 4/5 STF1517 (AB): 2020-03-28: At 187x the double star immediately appears elongated, but without notching. On closer observation, the slight difference in brightness could be detected. Not better at higher magnifications. Observation at quite good seeing (4/5).
152mm f/5.9, 225x, Bortle 7, SQM-L 18.8, Seeing 3/5 STF1517 (AB): 2020-03-27: Clearly elongated. In some moments the double star appeared notched with a small difference in brightness. Observation at moderate seeing (3/5).

STF 1521 (**)

Name:	STF1521
Type:	**
Constellation:	Leo
Coordinates:	11h15m20.95s / +27°34'15.60"

Components:
		m₁	m₂	ρ	θ	Year
		7m7	8m1	3.8"	97°	2019

Robert Zebahl
70mm f/5.7, 67x, Bortle 6-, NELM 5m0, SQM-L 19.1 At 44x still very close, finely separated pair with visible difference in brightness, rather faint. At 67x nicely separated, at 100x very easy. Colors were not clearly visible.

STF 1536 (**)

Name:	STF1536, iota Leo, 78 Leo
Type:	**
Constellation:	Leo
Coordinates:	11h23m55.37s / +10°31'46.90"

Components:
		m₁	m₂	ρ	θ	Year
	AB	4m1	6m7	2.2"	96°	2018
	AB-C	4m1	11m1	332.1"	346°	2015



Robert Zebahl
70mm f/5.7, 133x, Bortle 6, SQM-L 19.1, Seeing 4/5 AB: 2020-03-28: The companion was well visible as brightening on the diffraction ring of the primary component. Sketch see observation with my 102mm refractor.
102mm f/11, 125x, Bortle 6, SQM-L 19.1, Seeing 4/5 AB: 2020-03-28: At 125x clearly separated. A very beautiful sight! The companion was visible as almost round brightening close to the first diffraction ring of the primary component. The diffraction ring itself appeared very fine. At 224x also a very nice sight with a clear diffraction ring and the companion, which now appeared roundish.

STF 1537 (**)

Name:	STF1537
Type:	**
Constellation:	Leo
Coordinates:	11h24m28.94s / +20°37'16.50"

Components:
		m₁	m₂	ρ	θ	Year
		8m2	9m1	2.3"	358°	2019

Robert Zebahl
102mm f/11, Bortle 7, SQM-L 18.8, Seeing 3/5 2020-03-27: At 62x almost, at 86x clearly separated, whereby the components are still very close together. The companion appears rather dim. The slight difference in brightness is already visible at 62x. At 125x the double star shows itself clearly separated. The primary component appears more white, the companion appears a bit warmer in color.
152mm f/5.9, Bortle 7, SQM-L 18.8, Seeing 3/5 2020-03-27: At 49x the double star presents itself clearly elongated, at 69x it is almost separable. The two diffraction disks are well visible. At 100x very nicely separated at still quite small separation. The primary component appears rather white, the companion shows up in a warmer hue. A moderate difference in brightness is visible.

STF 1540 (**)

Name:	STF1540, 83 Leo
Type:	**
Constellation:	Leo
Coordinates:	11h26m45.32s / +03°00'47.20"

Components:
		m₁	m₂	ρ	θ	Year
	AB	6m5	7m5	28.4"	150°	2018

Robert Zebahl
55mm f/9.1, 16x, Bortle 6, SQM-L 19.5 Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather grey-bluish.

STF 1547 (**)

Name:	STF1547, 88 Leo
Type:	**
Constellation:	Leo
Coordinates:	11h31m44.94s / +14°21'52.20"

Components:
		m₁	m₂	ρ	θ	Year
	AB	6m3	9m1	15.5"	332°	2018



Robert Zebahl
55mm f/9.1, 42x, Bortle 6, SQM-L 19.5 Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.

STF 1552 (**)

Name:	STF1552, 90 Leo
Type:	**
Constellation:	Leo
Coordinates:	11h34m42.50s / +16°47'48.90"

Components:
		m₁	m₂	ρ	θ	Year
	AC	6m3	9m8	63.4"	235°	2018
	AB	6m3	7m3	3.1"	209°	2018

Robert Zebahl
55mm f/9.1, 42x, Bortle 6, SQM-L 19.5 AB: A and B very tight and unequal. Much fainter component C very wide apart. All components almost in line. Very nice view.

STFA 19 (**)

Name:	STFA19, 84 Leo, tau Leo
Type:	**
Constellation:	Leo
Coordinates:	11h27m56.23s / +02°51'22.50"

Components:
		m₁	m₂	ρ	θ	Year
	AB	5m0	7m5	89.2"	181°	2019

Robert Zebahl
55mm f/9.1, 16x, Bortle 6, SQM-L 19.5 Wonderful double with slight color contrast in a very nice field. Together with 83 Leo stunning view. Noticeable unequal. A appeared white-yellowish with a hint of orange, B grey-bluish.

STT 215 (**)

Name:	STT215
Type:	**
Constellation:	Leo
Coordinates:	10h16m16.05s / +17°44'24.60"

Components:
		m₁	m₂	ρ	θ	Year
		7m2	7m5	1.5"	176°	2019



Robert Zebahl
70mm f/5.7, 133x Appeared partly separated, partly as '8'. Brightness seemed to be equal.