20021+5439 BU  427CD

Coord 2000	20021+5439		Discov num	BU  427		Comp	CD		Coord arcsec 2000	20 02 22.85 +54 40 07.5
Date first	1877		Date last	2011		Obs	15
Pa first	337		Pa last	336		P.A. Now (θ)	336°
Sep first	3.0		Sep last	3.1		Sep. Now (ρ)	3.1"
Mag pri	8.39		Mag sec	10.18		delta mag (ΔM)	1.79		Spectral class	F2III (yellow-white)
Pri motion ra	+001		Sec motion ra	+000
Pri motion dec	-006		Sec motion dec	+000
Notes	N (See Notes)

rPM=1 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20021+5439	BU 426	AB	1877	2016	20	307	5.9	8.53	10.50	1.97
Show			20021+5439	BU 426	AC	1877	2015	17	53	163.2	8.53	8.39	0.14
Show			20021+5439	BU 427	CD	1877	2011	15	336	3.1	8.39	10.18	1.79		<===
Show			20021+5439	ENG 68	CE	1884	2015	13	158	160.3	8.39	8.92	0.53
Show			20021+5439	MLR 580	EF	1981	2008	3	159	0.6	8.90	13.20	4.30

Sextuple system
6 visible stars in this system

Precise pa	336.2		Precise sep	3.097		Constellation	Cygnus		SAO	32226
Tycho2	3940-00754-1		Gaia DR2	30468039424		HD	190464

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20021+5439	BU 427	CD	1999	12	338	3.1	8.39	10.18	F2III		200222.85+544007.5
20021+5439	BU 427	CD	2010	13	337	3.0	8.39	10.18	F2III		200222.85+544007.5
20021+5439	BU 427	CD	2011	15	336	3.1	8.39	10.18	F2III		200222.85+544007.5

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