20151+4118 A   387AC

Coord 2000	20151+4118		Discov num	A   387		Comp	AC		Coord arcsec 2000	20 15 08.10 +41 17 55.4
Date first	1892		Date last	2016		Obs	12
Pa first	221		Pa last	222		P.A. Now (θ)	222°
Sep first	23.4		Sep last	21.6		Sep. Now (ρ)	21.6"
Mag pri	7.90		Mag sec	10.75		delta mag (ΔM)	2.85		Spectral class	B9II-III (blue-white)
Pri motion ra	-001		Sec motion ra	+007
Pri motion dec	-001		Sec motion dec	+005
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=1.162 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49365	20151+4118	A 387	AB	1902	2016	12	151	5.1	7.90	11.48	3.58
Show		49365	20151+4118	A 387	AC	1892	2016	12	222	21.6	7.90	10.75	2.85		<===
Show		49365	20151+4118	A 387	CD	1998	2015	7	19	9.0	10.75	13.00	2.25

Quadruple system
4 visible stars in this system

Precise pa	222.2		Precise sep	21.62		Constellation	Cygnus		SAO	49365
HIP	99813		Tycho2	3159-00995-1		Gaia DR2	99174311296		HD	192803
BD	BD+40 4077		Distance	1219.51		Distance ly	3978.04

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20151+4118	A 387	AC	1998	5	221	21.9	7.90	10.75	B9II-III	N D	201508.10+411755.4
20151+4118	A 387	AC	2002	6	222	21.9	7.90	10.75	B9II-III	N D	201508.10+411755.4
20151+4118	A 387	AC	2016	7	222	21.6	7.90	10.75	B9II-III	N	201508.10+411755.4

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