20307+4137 CAN 28 AC

Coord 2000	20307+4137		Discov num	CAN  28		Comp	AC		Coord arcsec 2000	20 30 39.82 +41 36 50.7
Date first	2008		Date last	2008		Obs	2
Pa first	342		Pa last	341.5		P.A. Now (θ)	341.5°
Sep first	6.0		Sep last	6		Sep. Now (ρ)	6"
Mag pri	8.30		Mag sec	16.00		delta mag (ΔM)	7.7		Spectral class	O6V (blue)
Pri motion ra	-003		Sec motion ra
Pri motion dec	-002		Sec motion dec
Notes	N K (See Notes, 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 30 40 +41 36 51	CAN 1 Aa,Ab	2008	3	91	0.3	13.00	15.80	2.80
Show			20 30 40 +41 36 51	CAN 28 AB	2008	2	336	2.6	8.30	15.60	7.30
Show			20 30 40 +41 36 51	CAN 28 AC	2008	2	342	6.0	8.30	16.00	7.70		<===
Show			20 30 40 +41 36 51	CAN 28 AD	2008	1	168	7.0	8.30	17.20	8.90
Show			20 30 40 +41 36 51	CAN 28 AE	2008	1	337	7.8	8.30	17.60	9.30
Show			20 30 40 +41 36 51	CAN 28 AF	2008	1	20	8.2	8.30	16.70	8.40
Show			20 30 40 +41 36 51	CAN 28 AG	2008	2	158	9.0	8.30	14.30	6.00
Show			20 30 40 +41 36 51	CAN 28 AH	2008	2	284	9.2	8.30	15.40	7.10
Show			20 30 40 +41 36 51	CAN 28 AI	2008	3	44	10.1	8.30	15.10	6.80
Show			20 30 40 +41 36 51	CAN 28 AJ	2008	1	118	10.1	8.30	15.90	7.60
Show			20 30 40 +41 36 51	CAN 28 AK	2008	2	14	10.2	8.30	15.40	7.10
Show			20 30 40 +41 36 51	CAN 28 AL	2008	1	104	10.3	8.30	17.20	8.90
Show			20 30 40 +41 36 51	CAN 28 AM	2008	1	77	12.0	8.30	16.80	8.50
Show			20 30 40 +41 36 51	CAN 28 AN	2008	2	2	13.4	9.10	15.70	6.60
Show			20 30 40 +41 36 51	CAN 28 AO	2008	2	281	13.8	9.10	16.70	7.60

16-fold system
15 estimated visually detectable stars in this system

Constellation

Cygnus

discov_num	notes	refcode
CAN 1	[MT91] 5. Primary is an O6 star in the Cygnus OB2 Association.
	Caballero-Nieves et al. (2014) find some suggestion that the primary
	may itself have a close companion.	CaN2014

refcode	metd	author	reference
CaN2014	Hf j	Caballero-Nieves, S.M., Nelan, E.P., Gies, D.R., Wallace, D.J., DeGioia-Eastwood,	2014AJ....147...40C
CaN2014		K., Herrero, A., Jao, W.-J., Mason, B.D., Massey, P., Moffat, A.F., & Walborn, N.
CaN2014		AJ 147, 40, 2014

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20307+4137	CAN 28	AC	2008	2	342	6.0	8.30	16.00	O6V	N K	203039.82+413650.7

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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