20010+3742 BU 1289AC

Coord 2000	20010+3742		Discov num	BU 1289		Comp	AC		Coord arcsec 2000	20 00 59.61 +37 41 56.1
Date first	1896		Date last	2018		Obs	31
Pa first	90		Pa last	90		P.A. Now (θ)	90°
Sep first	21.4		Sep last	21.5		Sep. Now (ρ)	21.5"
Mag pri	8.15		Mag sec	9.70		delta mag (ΔM)	1.55		Spectral class	B5 (blue-white)
Pri motion ra	-007		Sec motion ra	-007
Pri motion dec	-009		Sec motion dec	+033
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=1.245 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		69258	20010+3742	BU 1289	AB	1899	2016	22	55	0.7	8.15	9.20	1.05
Show		69258	20010+3742	BU 1289	AC	1896	2018	31	90	21.5	8.15	9.70	1.55		<===
Show		69258	20010+3742	FOX 246	AB,D	1896	2015	12	170	104.2	8.15	11.17	3.02
Show		69258	20010+3742	WAL 125	AB,E	1944	2015	7	10	46.5	8.15	13.52	5.37

Quintuple system
6 visible stars in this system

Precise pa	89.8		Precise sep	21.504		Constellation	Cygnus		SAO	69258
HIP	98528		Tycho2	3150-02606-1		Gaia DR2	85726240640		HD	189901
BD	BD+37 3723		Distance	469.48		Distance ly	1531.44

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20010+3742	BU 1289	AC	2003	23	89	21.7	8.15	9.70		D	200059.61+374156.1
20010+3742	BU 1289	AC	2017	25	90	21.4	8.15	9.70	B5	N	200059.61+374156.1
20010+3742	BU 1289	AC	2018	27	90	21.5	8.15	9.70	B5	N	200059.61+374156.1

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