21028+4551 HLA 30 CG

Coord 2000	21028+4551		Discov num	HLA  30		Comp	CG		Coord arcsec 2000	21 02 40.75 +45 53 05.1
Date first	2016		Date last	2016		Obs	1
Pa first	148		Pa last	148		P.A. Now (θ)	148°
Sep first	7.3		Sep last	7.34		Sep. Now (ρ)	7.34"
Mag pri	5.40		Mag sec	14.30		delta mag (ΔM)	8.9		Spectral class	K2 (yellow-orange)
Pri motion ra	+404		Sec motion ra
Pri motion dec	+141		Sec motion dec
Notes	N U K (See Notes, Proper motion indicates non-physical, K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		50390	21 02 49 +45 50 56	BU 1138 AB	2006	57	172	0.1	7.10	7.30	0.20	Y
Show	HD 200595	50390	21 02 49 +45 50 56	BU 1138 AC	2012	21	330	152.1	6.46	7.82	1.36
Show		50388	21 02 41 +45 53 05	KUI 104 CD	2017	17	85	2.7	7.82	13.40	5.58
Show		50388	21 02 41 +45 53 05	BU 1138 CE	2003	8	249	23.6	7.82	12.38	4.56
Show		50388	21 02 41 +45 53 05	FYM 331 CF	2017	6	39	11.9	7.82	15.70	7.88
Show		50388	21 02 41 +45 53 05	HLA 30 CG	2016	1	148	7.3	5.40	14.30	8.90		<===

Septuple system
7 estimated visually detectable stars in this system

Var name	V2436 Cyg		Constellation	Cygnus		SAO	50388		HIP	103859
Tycho2	3588-03634-1		HD	200560		GL	Gl 816.1A		BD	BD+45 3371
Distance	19.47		Distance ly	63.51