20189+3817 A  1425AB

Coord 2000	20189+3817		Discov num	A  1425		Comp	AB		Coord arcsec 2000	20 18 51.71 +38 16 46.5
Date first	1906		Date last	2011		Obs	27
Pa first	297		Pa last	266		P.A. Now (θ)	266°
Sep first	0.2		Sep last	0.2		Sep. Now (ρ)	0.2"
Mag pri	7.95		Mag sec	8.25		delta mag (ΔM)	0.3		Spectral class	O9III (blue)
Pri motion ra	-010		Sec motion ra
Pri motion dec	-013		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		69815	20 18 52 +38 16 46	A 1425 AB	2011	27	266	0.2	7.95	8.25	0.30		<===
Show		69815	20 18 52 +38 16 46	A 1425 AB,C	2015	7	310	9.1	6.65	13.20	6.55

Triple system
4 visible stars in this system

Precise pa	266.2		Precise sep	0.182		Constellation	Cygnus		SAO	69815
HIP	100146		Tycho2	3151-03449-1		Gaia DR2	2061252769282480512		HD	193443
BD	BD+37 3879		Distance	1086.96		Distance ly	3545.66

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20189+3817	A 1425	AB	2005	25	259	0.1	8.25	7.95	O9II-III	N	201851.71+381646.5
20189+3817	A 1425	AB	2008	27	258	0.1	7.95	8.25	O9II-III	N	201851.71+381646.5

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