20313+4121 CAN 30 AC

Coord 2000	20313+4121		Discov num	CAN  30		Comp	AC		Coord arcsec 2000	20 31 18.33 +41 21 21.7
Date first	2008		Date last	2008		Obs	1
Pa first	185		Pa last	185.4		P.A. Now (θ)	185.4°
Sep first	6.6		Sep last	6.57		Sep. Now (ρ)	6.57"
Mag pri	7.70		Mag sec	15.30		delta mag (ΔM)	7.6		Spectral class	O9II (blue)
Pri motion ra	-002		Sec motion ra
Pri motion dec	-004		Sec motion dec
Notes	K (K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 31 18 +41 21 22	MZA 39 AB	2018	3	215	4.4	11.80	16.30	4.50
Show			20 31 18 +41 21 22	CAN 30 AC	2008	1	185	6.6	7.70	15.30	7.60		<===
Show			20 31 18 +41 21 22	CAN 30 AD	2008	1	101	10.7	7.70	15.00	7.30
Show			20 31 18 +41 21 22	CAN 30 AE	2008	1	116	11.1	7.70	15.10	7.40
Show			20 31 18 +41 21 22	CAN 30 AF	2008	1	234	11.4	7.70	14.70	7.00
Show			20 31 18 +41 21 22	CAN 30 AG	2008	2	274	12.4	7.70	15.00	7.30
Show			20 31 18 +41 21 22	CAN 30 AH	2008	1	275	12.7	7.70	15.40	7.70
Show			20 31 18 +41 21 22	CAN 30 AI	2008	1	272	13.3	7.70	13.60	5.90

Ninefold system
9 estimated visually detectable stars in this system

Constellation

Cygnus