20108+3713 TOB 174AB

Coord 2000	20108+3713		Discov num	TOB 174		Comp	AB		Coord arcsec 2000	20 10 52.52 +37 12 28.1
Date first	1983		Date last	2015		Obs	8
Pa first	261		Pa last	263		P.A. Now (θ)	263°
Sep first	24.4		Sep last	25.1		Sep. Now (ρ)	25.1"
Mag pri	11.07		Mag sec	12.59		delta mag (ΔM)	1.52		Spectral class	B5: (blue-white)
Pri motion ra	-002		Sec motion ra	+002
Pri motion dec	-007		Sec motion dec	+005
Notes

rPM=1.737 This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 10 53 +37 12 28	TOB 174 AB	2015	8	263	25.1	11.07	12.59	1.52		<===
Show			20 10 50 +37 12 25	SLE 952 BC	2015	8	91	6.8	12.59	12.83	0.24
Show			20 10 50 +37 12 25	SLE 952 BD	2015	8	353	12.2	12.59	13.58	0.99

Quadruple system
4 visible stars in this system

Precise pa	262.5		Precise sep	25.096		Constellation	Cygnus		Tycho2	2683-01307-1
Gaia DR2	2060775198963848576

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20108+3713	TOB 174	AB	1998	2	263	25.2	11.07	12.59		D	201052.52+371228.1
20108+3713	TOB 174	AB	2002	3	263	25.2	11.07	12.59		D	201052.52+371228.1
20108+3713	TOB 174	AB	2015	4	263	25.1	11.07	12.59	B5:		201052.52+371228.1

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