20123+3451 AG  249AB

Coord 2000	20123+3451		Discov num	AG  249		Comp	AB		Coord arcsec 2000	20 12 18.31 +34 51 10.7
Date first	1896		Date last	2015		Obs	17
Pa first	133		Pa last	133		P.A. Now (θ)	133°
Sep first	34.6		Sep last	32.9		Sep. Now (ρ)	32.9"
Mag pri	7.96		Mag sec	10.78		delta mag (ΔM)	2.82		Spectral class	K2V (yellow-orange)
Pri motion ra	+016		Sec motion ra	+002
Pri motion dec	-007		Sec motion dec	-002
Notes

rPM=0.851 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20123+3451	AG 249	AB	1896	2015	17	133	32.9	7.96	10.78	2.82		<===
Show			20123+3451	AG 249	AC	1902	2015	7	30	13.0	7.96	14.00	6.04
Show			20123+3451	AG 249	CD	2002	2015	6	352	6.3	14.00	13.80	0.20

Quadruple system
4 visible stars in this system

Precise pa	132.7		Precise sep	32.882		Constellation	Cygnus		SAO	69595
HIP	99562		Tycho2	2679-02011-1		Gaia DR2	22339016064		HD	192164
BD	BD+34 3910		Distance	531.91		Distance ly	1735.09

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20123+3451	AG 249	AB	2008	10	132	33.1	7.96	10.78	K2V	D	201218.31+345110.7
20123+3451	AG 249	AB	2012	12	132	32.6	7.96	10.78	K2V	D	201218.31+345110.7
20123+3451	AG 249	AB	2015	13	133	32.9	7.96	10.78	K2V		201218.31+345110.7

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