20205+4351 BU 1207AB (V1687 Cyg)

Coord 2000	20205+4351		Discov num	BU 1207		Comp	AB		Coord arcsec 2000	20 20 27.98 +43 51 16.3
Date first	1890		Date last	2015		Obs	10
Pa first	218		Pa last	211		P.A. Now (θ)	211°
Sep first	5.8		Sep last	4.8		Sep. Now (ρ)	4.8"
Mag pri	6.85		Mag sec	14.40		delta mag (ΔM)	7.55		Spectral class	WC6/7 (Wolf-Rayet)
Pri motion ra	-003		Sec motion ra
Pri motion dec	-008		Sec motion dec
Notes	N (See Notes)

Visually invisible, K-band or other infrared star 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		49491	20205+4351	IOT 2	Aa,Ab	2003	2009	7	146	0.0	6.85			Y
Show	V1687 Cyg	49491	20205+4351	BU 1207	AB	1890	2015	10	211	4.8	6.85	14.40	7.55		<===
Show		49491	20205+4351	TRN 29	AC	2001	2001	1	202	2.3	6.85	16.00	9.15

Quadruple system
3 visible stars in this system

Precise pa	210.6		Precise sep	4.783		Var name	V1687 Cyg		Constellation	Cygnus
SAO	49491		HIP	100287		Tycho2	3164-01678-1		Gaia DR2	72633822592
HD	193793		BD	BD+43 3571		Distance	4000		Distance ly	13048

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20205+4351	BU 1207	AB	2002	8	210	4.8	6.85	14.40		N	202027.98+435116.3
20205+4351	BU 1207	AB	2008	9	211	4.8	6.85	14.40		N	202027.98+435116.3
20205+4351	BU 1207	AB	2015	10	211	4.8	6.85	14.40	WC6/7	N	202027.98+435116.3

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