20210+3919 SEI1097AB

Coord 2000	20210+3919		Discov num	SEI1097		Comp	AB		Coord arcsec 2000	20 21 02.17 +39 17 33.7
Date first	1892		Date last	2015		Obs	23
Pa first	51		Pa last	44		P.A. Now (θ)	44°
Sep first	23.3		Sep last	27.2		Sep. Now (ρ)	27.2"
Mag pri	11.20		Mag sec	12.19		delta mag (ΔM)	0.99		Spectral class
Pri motion ra	-004		Sec motion ra	+004
Pri motion dec	-022		Sec motion dec	+013
Notes	L (Linear solution)

rPM=1.606 This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 21 02 +39 17 34	SEI 1097 AB	2015	23	44	27.2	11.20	12.19	0.99		<===
Show			20 21 04 +39 17 52	TOB 186 BC	2015	10	51	16.2	12.19	12.09	0.10

Triple system
3 visible stars in this system

Precise pa	44.3		Precise sep	27.193		Constellation	Cygnus		Tycho2	3152-00403-1
Gaia DR2	2061412365949650688

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20210+3919	SEI1097	AB	1998	8	45	26.6	11.20	12.02		LD	202102.17+391733.7
20210+3919	SEI1097	AB	2008	9	46	27.2	11.20	12.02		LD	202102.17+391733.7
20210+3919	SEI1097	AB	2015	11	44	27.2	11.20	12.19		L	202102.17+391733.7

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