20553+4218 OSO 137 AF

Coord 2000	20553+4218		Discov num	OSO 137		Comp	AF		Coord arcsec 2000	20 55 16.75 +42 18 00.6
Date first	1995		Date last	2000		Obs	2
Pa first	141		Pa last	136.5		P.A. Now (θ)	136.5°
Sep first	18.5		Sep last	16.8		Sep. Now (ρ)	16.8"
Mag pri	10.27		Mag sec	17.90		delta mag (ΔM)	7.63		Spectral class	G5 (yellow)
Pri motion ra	+057		Sec motion ra
Pri motion dec	-390		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 55 17 +42 18 01	OSO 137 AB	2000	2	116	10.8	10.27	18.50	8.23
Show			20 55 17 +42 18 01	OSO 137 AC	2000	2	225	11.6	10.27	18.40	8.13
Show			20 55 17 +42 18 01	OSO 137 AD	2000	2	276	14.3	10.27	18.70	8.43
Show			20 55 17 +42 18 01	OSO 137 AE	2000	2	295	14.9	10.27	18.90	8.63
Show			20 55 17 +42 18 01	OSO 137 AF	2000	2	137	16.8	10.27	17.90	7.63		<===
Show			20 55 17 +42 18 01	OSO 137 AG	2000	2	346	25.0	10.27	17.50	7.23

Septuple system
7 estimated visually detectable stars in this system

Constellation

Cygnus

Tycho2

3175-00128-1

discov_num	notes	refcode
OSO 137	G212-007. AB, AC, AD, AF and AG are not common proper motion pairs,
	based on comparison with POSS2 red plates	Oso2004

refcode	metd	author	reference
Oso2004	C j	Zapatero Osorio, M.R. & Martin, E.L.	2004A&A...419..167Z
Oso2004	+Pa	A&A 419, 167, 2004

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20553+4218	OSO 137	AF	2000	2	137	16.8	10.27	17.90		N D	205516.75+421800.6

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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