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Doubles in session

Current system

20277+4507
BKO 154 EK

Selections

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Binocular doubles
Binary Systems
Triple Systems
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Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20277+4507 BKO 154 EK

20^h 27^m 34.68^s +45° 06' 54.6" P.A. 109.00 sep 4.7 mag 11.20,13.00

Coord 2000	20277+4507		Discov num	BKO 154		Comp	EK		Coord arcsec 2000	20 27 34.68 +45 06 54.6
Date first	1998		Date last	2015		Obs	4
Pa first	107		Pa last	108.6		P.A. Now (θ)	108.6°
Sep first	4.8		Sep last	4.724		Sep. Now (ρ)	4.724"
Mag pri	11.20		Mag sec	13.00		delta mag (ΔM)	1.8		Spectral class
Pri motion ra	-004		Sec motion ra
Pri motion dec	+003		Sec motion dec
Notes

Nature of this double is uncertain.

20277+4507 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 27 42 +45 06 38	ROE 43 AB	2015	9	317	17.4	9.38	14.80	5.42
Show			20 27 42 +45 06 38	ROE 43 AC	2015	8	312	52.6	9.38	13.19	3.81
Show			20 27 42 +45 06 38	ROE 43 AD	2015	9	271	42.4	9.38	12.47	3.09
Show			20 27 42 +45 06 38	ROE 43 AE	2015	11	282	82.9	9.38	11.19	1.81
Show			20 27 42 +45 06 38	ROE 43 AF	2015	13	336	87.1	9.38	12.40	3.02
Show			20 27 42 +45 06 38	ROE 43 AG	2015	13	282	102.4	9.38	12.85	3.47
Show			20 27 42 +45 06 38	BKO 154 AH	2015	7	224	18.4	9.38	12.70	3.32
Show			20 27 42 +45 06 38	BKO 154 AI	2015	7	63	24.2	9.38	14.00	4.62
Show			20 27 39 +45 07 13	BKO 154 CJ	2015	4	331	17.9	13.40	13.90	0.50
Show			20 27 35 +45 06 55	BKO 154 EK	2015	4	109	4.7	11.20	13.00	1.80		<===

11-fold system
11 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation

Cygnus

Tycho2

3573-00591-1

Gaia DR2

2070872117318026240