20316+4113 ES 1679AB

Coord 2000	20316+4113		Discov num	ES 1679		Comp	AB		Coord arcsec 2000	20 31 37.49 +41 13 20.9
Date first	1917		Date last	2015		Obs	9
Pa first	217		Pa last	214		P.A. Now (θ)	214°
Sep first	4.5		Sep last	4.0		Sep. Now (ρ)	4"
Mag pri	10.57		Mag sec	13.20		delta mag (ΔM)	2.63		Spectral class	O6IV+B0IV (blue/blue-white)
Pri motion ra	-008		Sec motion ra
Pri motion dec	-018		Sec motion dec
Notes	V (Proper motion indicates physical)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49745	20 31 37 +41 13 21	ES 1679 AB	2015	9	214	4.0	10.57	13.20	2.63		<===
Show		49745	20 31 37 +41 13 21	CAN 75 AC	2005	2	166	8.2	5.70	12.70	7.00
Show		49745	20 31 37 +41 13 21	CAN 75 AD	2015	7	269	11.8	5.70	12.40	6.70

Quadruple system
4 visible stars in this system

Precise pa	214.4		Precise sep	3.977		Constellation	Cygnus		SAO	49745
Tycho2	3157-00299-1

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20316+4113	ES 1679	AB	2015	9	214	4.0	10.57	13.20	O6IV+B0IV	V	203137.49+411320.9

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