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20423+4549
BKO 158 EF

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

20423+4549 BKO 158 EF

20^h 42^m 24.92^s +45° 48' 44.2" P.A. 281.00 sep 24.9 mag 10.55,12.20

Coord 2000	20423+4549		Discov num	BKO 158		Comp	EF		Coord arcsec 2000	20 42 24.92 +45 48 44.2
Date first	1998		Date last	2015		Obs	9
Pa first	281		Pa last	280.7		P.A. Now (θ)	280.7°
Sep first	24.8		Sep last	24.915		Sep. Now (ρ)	24.915"
Mag pri	10.55		Mag sec	12.20		delta mag (ΔM)	1.65		Spectral class
Pri motion ra	-001		Sec motion ra	-009
Pri motion dec	-002		Sec motion dec	+002
Notes	N (See Notes)

rPM=0.97

This double is not physical.

20423+4549 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 197488	49960	20 42 20 +45 49 24	STT 411 AB	2015	50	349	31.8	7.66	10.58	2.92
Show		49960	20 42 20 +45 49 24	WAL 132 AC	2015	16	357	71.2	7.66	10.23	2.57
Show		49960	20 42 20 +45 49 24	BKO 158 AF	2015	11	143	41.0	7.66	12.20	4.54
Show			20 42 20 +45 49 53	WAL 132 BC	2015	15	4	40.1	10.58	10.23	0.35
Show			20 42 20 +45 49 53	CTT 15 BD	2015	13	178	86.6	10.58	10.60	0.02
Show			20 42 20 +45 49 53	CTT 15 BE	2015	12	141	87.9	10.58	10.55	0.03
Show			20 42 25 +45 48 44	BKO 158 EF	2015	9	281	24.9	10.55	12.20	1.65		<===
Show			20 42 25 +45 48 44	BKO 158 EG	2015	7	221	28.7	10.55	14.00	3.45
Show			20 42 25 +45 48 44	BKO 158 EH	2015	7	340	51.6	10.55	12.60	2.05
Show			20 42 25 +45 48 44	BKO 158 EI	2014	6	236	39.6	10.55	13.60	3.05

Ninefold system
9 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation

Cygnus

Tycho2

3574-03272-1

Gaia DR2

2070448637851252352