20007+3635 HDS2851Aa,Ab

Coord 2000	20007+3635		Discov num	HDS2851		Comp	Aa,Ab		Coord arcsec 2000	20 00 44.81 +36 35 23.0
Date first	1991		Date last	2011		Obs	2
Pa first	332		Pa last	171		P.A. Now (θ)	171°
Sep first	0.2		Sep last	0.4		Sep. Now (ρ)	0.4"
Mag pri	6.76		Mag sec	9.75		delta mag (ΔM)	2.99		Spectral class	B6IV (blue-white)
Pri motion ra	+004		Sec motion ra
Pri motion dec	-002		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		69252	20 00 45 +36 35 23	HDS 2851 Aa,Ab	2011	2	171	0.4	6.76	9.75	2.99		<===
Show		69252	20 00 45 +36 35 23	WEB 9 AB	2016	22	202	71.6	6.69	8.97	2.28
Show		69252	20 00 45 +36 35 23	WEB 9 AC	2004	12	220	82.1	6.69	9.84	3.15
Show		69251	20 00 43 +36 34 17	WEB 9 BC	2018	21	279	26.3	8.97	9.84	0.87
Show		69251	20 00 40 +36 34 20	WEB 9 CD	2018	13	325	13.9	9.84	10.30	0.46

Quintuple system
4 visible stars in this system

Precise pa	171.2		Precise sep	0.367		Constellation	Cygnus		SAO	69252
HIP	98510		Tycho2	2682-02072-1		Gaia DR2	2060120375407807744		HD	189864
BD	BD+36 3816		Distance	254.45		Distance ly	830.02

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20007+3635	HDS2851	Aa,Ab	1991	1	332	0.2	6.76	9.75	B6IV		200044.81+363523.0
20007+3635	HDS2851	Aa,Ab	2003	2	290	0.4	6.76	9.75	B6IV		200044.81+363523.0

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