20423+4549 WAL 132 AC

Coord 2000	20423+4549		Discov num	WAL 132		Comp	AC		Coord arcsec 2000	20 42 20.31 +45 49 24.5
Date first	1892		Date last	2015		Obs	16
Pa first	349		Pa last	357.3		P.A. Now (θ)	357.3°
Sep first	49.0		Sep last	71.241		Sep. Now (ρ)	71.241"
Mag pri	7.66		Mag sec	10.23		delta mag (ΔM)	2.57		Spectral class	G2V (yellow)
Pri motion ra	-056		Sec motion ra	-004
Pri motion dec	-189		Sec motion dec	+001
Notes	N W (See Notes, )

rPM=0.999 This double is not physical.

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

Constellation	Cygnus		SAO	49960		HIP	102189		Tycho2	3574-02567-1
Gaia DR2	2070448844010046592		HD	197488		BD	BD+45 3245		Distance	54.14
Distance ly	176.6

discov_num	notes	refcode
STT 411	AB: Optical pair, based on study of relative motion of the components
	using the method of apparent motion parameters.	Kiy2008

refcode	metd	author	reference
Kiy2008	-	Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S.	2008SvAL...32..405K
Kiy2008		SvAL 34, 405, 2008

idgroup	discov	author
1	BKO	Ladanyi, T. & Berko, E.
32	CTT	Courtot, J.-F.
77	STT	Struve, O.
114	WAL	Wallenquist, A.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20423+4549	WAL 132	AC	2008	9	357	70.2	7.66	10.23		D	204220.31+454924.5
20423+4549	WAL 132	AC	2015	11	357	71.2	7.66	10.23	G2V	N	204220.31+454924.5

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS