20131+3209 TDT2096Aa,Ab

Coord 2000	20131+3209		Discov num	TDT2096		Comp	Aa,Ab		Coord arcsec 2000	20 13 01.20 +32 08 34.9
Date first	1991		Date last	2015		Obs	2
Pa first	16		Pa last	13		P.A. Now (θ)	13°
Sep first	1.2		Sep last	1.3		Sep. Now (ρ)	1.3"
Mag pri	10.62		Mag sec	11.18		delta mag (ΔM)	0.56		Spectral class
Pri motion ra	+018		Sec motion ra	+018
Pri motion dec	-024		Sec motion dec	-024
Notes

Nature of this double is uncertain.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20131+3209	TDT2096	Aa,Ab	1991	2015	2	13	1.3	10.62	11.18	0.56		<===
Show			20131+3209	SEI1008	AB	1893	2015	9	73	20.4	10.62	10.82	0.20
Show			20131+3209	FYM 76	BD	1933	2015	9	45	16.7	10.98	12.76	1.78

Quadruple system
3 visible stars in this system

Precise pa	12.5		Precise sep	1.308		Constellation	Cygnus		Tycho2	2675-02309-1
Gaia DR2	72361105152		HD	331989

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20131+3209	TDT2096	Aa,Ab	1991	1	16	1.2	10.62	11.18			201301.20+320834.9
20131+3209	TDT2096	Aa,Ab	2015	2	13	1.3	10.62	11.18			201301.20+320834.9

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