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20375+3134
STFA 53 AC

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20375+3134 STFA 53 AC

20^h 37^m 31.77^s +31° 34' 21.1" sep 71.3 mag 6.29,13.52 Sp B8IIIn dist. 261.78 pc (853.93 l.y.)

Coord 2000	20375+3134		Discov num	STFA 53		Comp	AC		Coord arcsec 2000	20 37 31.77 +31 34 21.1
Date first	1911		Date last	2015		Obs	4
Pa first	1		Pa last	0.3		P.A. Now (θ)	0.3°
Sep first	71.2		Sep last	71.34		Sep. Now (ρ)	71.34"
Mag pri	6.29		Mag sec	13.52		delta mag (ΔM)	7.23		Spectral class	B8IIIn (blue-white)
Pri motion ra	+009		Sec motion ra	+008
Pri motion dec	-000		Sec motion dec	+004
Notes	N (See Notes)

rPM=0.458

Nature of this double is uncertain.

20375+3134 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	48 Cyg	70287	20 37 32 +31 34 21	STFA 53 AB	2012	35	177	182.7	6.29	6.54	0.25
Show		70287	20 37 32 +31 34 21	STFA 53 AC	2015	4	0	71.3	6.29	13.52	7.23		<===
Show		70287	20 37 32 +31 34 21	FYM 138 AH	2012	3	89	111.0	6.29	14.00	7.71
Show		70289	20 37 33 +31 31 19	FYM 138 BD	2015	4	35	41.0	6.54	14.50	7.96
Show		70289	20 37 33 +31 31 19	FYM 138 BE	2015	4	29	58.4	6.54	14.40	7.86
Show		70289	20 37 33 +31 31 19	FYM 138 BF	2015	4	81	38.8	6.54	15.20	8.66
Show		70289	20 37 33 +31 31 19	FYM 138 BG	2015	4	83	62.5	6.54	15.00	8.46

Octuple system
8 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Cygnus		SAO	70287		HIP	101765		Tycho2	2686-01751-1
Gaia DR2	1862667259759305216		HD	196606		HR	7885		GC	28713
BD	BD+31 4159		Flamsteed	48 Cygni		Flamsteed name	48 Cyg		Distance	261.78
Distance ly	853.93