20231+4047 J   787AD

Coord 2000	20231+4047		Discov num	J   787		Comp	AD		Coord arcsec 2000	20 23 07.30 +40 46 55.2
Date first	1917		Date last	2015		Obs	5
Pa first	291		Pa last	293		P.A. Now (θ)	293°
Sep first	15.7		Sep last	15.8		Sep. Now (ρ)	15.8"
Mag pri	10.50		Mag sec	12.40		delta mag (ΔM)	1.9		Spectral class	B3 (blue-white)
Pri motion ra	-006		Sec motion ra	+001
Pri motion dec	-002		Sec motion dec	-007
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=1.217 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49556	20231+4047	J 787	AB	1912	2003	4	165	2.6	10.50	11.40	0.90
Show		49556	20231+4047	J 787	AC	1917	2015	5	112	9.5	10.50	13.00	2.50
Show		49556	20231+4047	J 787	AD	1917	2015	5	293	15.8	10.50	12.40	1.90		<===
Show		49556	20231+4047	J 787	CD	1917	2015	9	292	25.3	13.00	12.40	0.60

Quadruple system
4 visible stars in this system

Precise pa	292.7		Precise sep	15.772		Constellation	Cygnus		SAO	49556
Tycho2	3156-01857-1		Gaia DR2	59999953024

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20231+4047	J 787	AD	2003	3	293	15.9	9.40	12.00		N D	202307.30+404655.2
20231+4047	J 787	AD	2015	5	293	15.8	10.50	12.40	B3	N	202307.30+404655.2

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