20257+4004 POP 199AC

Coord 2000	20257+4004		Discov num	POP 199		Comp	AC		Coord arcsec 2000	20 25 44.56 +40 03 59.0
Date first	1892		Date last	2015		Obs	8
Pa first	245		Pa last	245		P.A. Now (θ)	245°
Sep first	58.8		Sep last	59.6		Sep. Now (ρ)	59.6"
Mag pri	8.73		Mag sec	11.94		delta mag (ΔM)	3.21		Spectral class	A0 (white)
Pri motion ra	+000		Sec motion ra	-009
Pri motion dec	-011		Sec motion dec	-008
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=0.788 Nature of this double is uncertain.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		70001	20257+4004	TOR 25	AB	1977	2015	9	191	4.7	8.73	10.50	1.77
Show		70001	20257+4004	POP 199	AC	1892	2015	8	245	59.6	8.73	11.94	3.21		<===

Triple system
3 visible stars in this system

Precise pa	244.8		Precise sep	59.551		Constellation	Cygnus		SAO	70001
Tycho2	3156-00461-1		Gaia DR2	87612516608		HD	194720

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20257+4004	POP 199	AC	1998	5	245	59.5	8.73	10.70	A0	D	202544.56+400359.0
20257+4004	POP 199	AC	2009	6	245	59.7	8.73	10.70	A0	N D	202544.56+400359.0
20257+4004	POP 199	AC	2015	8	245	59.6	8.73	11.94	A0	N	202544.56+400359.0

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