20121+4618 OSO 120AD

Coord 2000	20121+4618		Discov num	OSO 120		Comp	AD		Coord arcsec 2000	20 12 05.66 +46 18 01.7
Date first	1995		Date last	1995		Obs	1
Pa first	90		Pa last	90		P.A. Now (θ)	90°
Sep first	20.2		Sep last	20.2		Sep. Now (ρ)	20.2"
Mag pri	9.13		Mag sec	17.20		delta mag (ΔM)	8.07		Spectral class	K2 (yellow-orange)
Pri motion ra	+222		Sec motion ra	-020
Pri motion dec	+292		Sec motion dec	-022
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=1.081 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49312	20121+4618	OSO 120	AB	1995	1995	1	30	13.5	9.13	17.00	7.87
Show		49312	20121+4618	OSO 120	AC	1995	2003	3	192	16.7	9.13	15.20	6.07
Show		49312	20121+4618	OSO 120	AD	1995	1995	1	90	20.2	9.13	17.20	8.07		<===

Quadruple system
4 visible stars in this system

Precise pa	90		Precise sep	20.2		Constellation	Cygnus		SAO	49312
HIP	99542		Tycho2	3559-02097-1		HD	192239		BD	BD+45 3091
Distance	39.84		Distance ly	129.96

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20121+4618	OSO 120	AD	1995	1	90	20.2	9.06	17.20		N D	201205.66+461801.8

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