20123+3205 STF2649AD

Coord 2000	20123+3205		Discov num	STF2649		Comp	AD		Coord arcsec 2000	20 12 18.61 +32 04 51.8
Date first	1893		Date last	2018		Obs	15
Pa first	38		Pa last	36		P.A. Now (θ)	36°
Sep first	175.4		Sep last	175.9		Sep. Now (ρ)	175.9"
Mag pri	7.86		Mag sec	10.63		delta mag (ΔM)	2.77		Spectral class	A2 (white)
Pri motion ra	+016		Sec motion ra	+001
Pri motion dec	-022		Sec motion dec	+004
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=1.103 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		69594	20123+3205	STF2649	AB	1832	2018	47	151	21.6	7.86	9.85	1.99
Show		69594	20123+3205	STF2649	AC	1893	2018	18	284	131.0	7.86	11.41	3.55
Show		69594	20123+3205	STF2649	AD	1893	2018	15	36	175.9	7.86	10.63	2.77		<===

Quadruple system
4 visible stars in this system

Precise pa	36.1		Precise sep	175.89		Constellation	Cygnus		SAO	69594
HIP	99564		Tycho2	2675-03232-1		Gaia DR2	80217733120		HD	192165
BD	BD+31 3988		Distance	102.25		Distance ly	333.54

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20123+3205	STF2649	AD	1998	8	36	176.0	7.86	10.63		N D	201218.61+320451.8
20123+3205	STF2649	AD	2002	9	36	175.9	7.86	10.63		N D	201218.61+320451.8
20123+3205	STF2649	AD	2015	10	36	176.2	7.86	10.63	A2	N	201218.61+320451.8
20123+3205	STF2649	AD	2018	15	36	175.9	7.86	10.63	A2	N	201218.61+320451.8

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