20115+3639 SEI 974AB

Coord 2000	20115+3639		Discov num	SEI 974		Comp	AB		Coord arcsec 2000	20 11 33.03 +36 38 30.2
Date first	1896		Date last	2015		Obs	12
Pa first	9		Pa last	7		P.A. Now (θ)	7°
Sep first	19.0		Sep last	18.1		Sep. Now (ρ)	18.1"
Mag pri	10.66		Mag sec	10.85		delta mag (ΔM)	0.19		Spectral class
Pri motion ra	+005		Sec motion ra	-002
Pri motion dec	-001		Sec motion dec	-007
Notes

rPM=1.266 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20115+3639	SEI 974	AB	1896	2015	12	7	18.1	10.66	10.85	0.19		<===
Show			20115+3639	TOB 175	AC	1896	2015	12	95	53.3	10.66	11.52	0.86
Show			20115+3639	TOB 175	AD	1896	2015	9	123	36.6	10.66	12.55	1.89

Quadruple system
4 visible stars in this system

Precise pa	7		Precise sep	18.064		Constellation	Cygnus		Tycho2	2683-00200-1
Gaia DR2	34126706432

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20115+3639	SEI 974	AB	1998	6	6	18.8	10.66	10.85		D	201133.03+363830.2
20115+3639	SEI 974	AB	2002	7	7	18.3	10.66	10.85		D	201133.03+363830.2
20115+3639	SEI 974	AB	2015	8	7	18.1	10.66	10.85			201133.03+363830.2

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