20339+4642 HDS2940Aa,Ab

Coord 2000	20339+4642		Discov num	HDS2940		Comp	Aa,Ab		Coord arcsec 2000	20 33 54.84 +46 41 37.9
Date first	1991		Date last	2009		Obs	8
Pa first	56		Pa last	46		P.A. Now (θ)	46°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.3"
Mag pri	5.76		Mag sec	9.48		delta mag (ΔM)	3.72		Spectral class	B9sp... (blue-white)
Pri motion ra	+010		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		49804	20 33 55 +46 41 38	HDS 2940 Aa,Ab	2009	8	46	0.3	5.76	9.48	3.72		<===
Show	V2015 Cyg	49804	20 33 55 +46 41 38	BU 1489 AB	2012	13	16	116.5	5.75	9.35	3.60

Triple system
2 visible stars in this system

Precise pa	45.6		Precise sep	0.279		Var name	V2015 Cyg		Constellation	Cygnus
SAO	49804		HIP	101475		Tycho2	3573-01361-1		Gaia DR2	2071438198315555584
HD	196178		HR	7870		BD	BD+46 2977		Distance	132.28
Distance ly	431.5

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20339+4642	HDS2940	Aa,Ab	1996	5	60	0.3	5.76	9.48	B9sp...	D	203354.84+464137.9
20339+4642	HDS2940	Aa,Ab	2009	7	46	0.3	5.76	9.48	B9sp...	N	203354.84+464137.9

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