20339+4642 BU 1489AB (V2015 Cyg)

Coord 2000	20339+4642		Discov num	BU 1489		Comp	AB		Coord arcsec 2000	20 33 54.84 +46 41 37.9
Date first	1893		Date last	2012		Obs	13
Pa first	17		Pa last	16		P.A. Now (θ)	16°
Sep first	118.1		Sep last	116.5		Sep. Now (ρ)	116.5"
Mag pri	5.75		Mag sec	9.35		delta mag (ΔM)	3.6		Spectral class	B9pSi (blue-white)
Pri motion ra	+010		Sec motion ra	-002
Pri motion dec	+002		Sec motion dec	-003
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=1.275 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49804	20339+4642	HDS2940	Aa,Ab	1991	2009	8	46	0.3	5.76	9.48	3.72
Show	V2015 Cyg	49804	20339+4642	BU 1489	AB	1893	2012	13	16	116.5	5.75	9.35	3.60		<===

Triple system
2 visible stars in this system

Precise pa	16		Precise sep	116.53		Var name	V2015 Cyg		Constellation	Cygnus
SAO	49804		HIP	101475		Tycho2	3573-01361-1		Gaia DR2	98315555584
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	BU 1489	AB	2002	10	17	117.5	5.75	9.35	B9pSi	N	203354.84+464137.9
20339+4642	BU 1489	AB	2003	12	16	117.4	5.75	9.35	B9pSi	N	203354.84+464137.9
20339+4642	BU 1489	AB	2012	13	16	116.5	5.75	9.35	B9pSi	N	203354.84+464137.9

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