20310+3656 AC   18AB (44 Cyg)

Coord 2000	20310+3656		Discov num	AC   18		Comp	AB		Coord arcsec 2000	20 30 59.23 +36 56 09.1
Date first	1859		Date last	1991		Obs	18
Pa first	155		Pa last	158		P.A. Now (θ)	158°
Sep first	2.5		Sep last	2.2		Sep. Now (ρ)	2.2"
Mag pri	6.32		Mag sec	10.12		delta mag (ΔM)	3.8		Spectral class	F5Iab (yellow-white)
Pri motion ra	-001		Sec motion ra	+000
Pri motion dec	-002		Sec motion dec	-004
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=0.559 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	44 Cyg	70135	20310+3656	AC 18	AB	1859	1991	18	158	2.2	6.32	10.12	3.80		<===
Show		70135	20310+3656	KUI 98	AC	1935	2015	6	76	16.8	6.32	12.80	6.48
Show		70135	20310+3656	AC 18	AD	1913	2015	4	165	63.1	6.32	12.30	5.98

Quadruple system
4 visible stars in this system

Precise pa	157.8		Precise sep	2.16		Name	44 Cyg		Constellation	Cygnus
SAO	70135		HIP	101214		Tycho2	2697-01634-1		Gaia DR2	76738256384
HD	195593		HR	7847		GC	28551		BD	BD+36 4105
Flamsteed	44 Cygni		Flamsteed name	44 Cyg		Distance	1041.67		Distance ly	3397.93

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20310+3656	AC 18	AB	1991	18	158	2.2	6.32	10.12	F5Iab	N D	203059.23+365609.1

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