20118+3936 ES 1973AB,C

Coord 2000	20118+3936		Discov num	ES 1973		Comp	AB,C		Coord arcsec 2000	20 11 50.16 +39 36 28.3
Date first	1922		Date last	2011		Obs	2
Pa first	358		Pa last	352		P.A. Now (θ)	352°
Sep first	4.3		Sep last	4.1		Sep. Now (ρ)	4.1"
Mag pri	10.60		Mag sec	12.80		delta mag (ΔM)	2.2		Spectral class	B8III (blue-white)
Pri motion ra	-002		Sec motion ra
Pri motion dec	-003		Sec motion dec
Notes

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 11 50 +39 36 28	COU 2415 AB	2012	6	155	0.3	9.80	10.20	0.40
Show			20 11 50 +39 36 28	ES 1973 AB,C	2011	2	352	4.1	10.60	12.80	2.20		<===

Triple system
4 visible stars in this system

Precise pa	351.7		Precise sep	4.07		Constellation	Cygnus		Tycho2	3155-02052-1
HD	228242

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20118+3936	ES 1973	AB,C	1922	1	358	4.3	10.60	12.80	B8III		201150.16+393628.3
20118+3936	ES 1973	AB,C	2011	2	352	4.1	10.60	12.80	B8III		201150.16+393628.3

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