20324+4118 HER   3AB (V729 Cyg)

Coord 2000	20324+4118		Discov num	HER   3		Comp	AB		Coord arcsec 2000	20 32 22.42 +41 18 18.9
Date first	1967		Date last	2018		Obs	10
Pa first	65		Pa last	55		P.A. Now (θ)	55°
Sep first	1.5		Sep last	0.9		Sep. Now (ρ)	0.9"
Mag pri	9.40		Mag sec	11.94		delta mag (ΔM)	2.54		Spectral class	O7I+O7I (blue/blue)
Pri motion ra	-001		Sec motion ra	-001
Pri motion dec	-006		Sec motion dec	-003
Notes	N V (See Notes, Proper motion indicates physical)

Visually invisible, K-band or other infrared star rPM=0.493 This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	V729 Cyg		20324+4118	HER 3	AB	1967	2018	10	55	0.9	9.40	11.94	2.54		<===
Show			20324+4118	MZA 25	AC	1998	2015	9	324	20.5	9.40	15.40	6.00
Show			20324+4118	MZA 25	AD	2003	2015	5	226	5.5	9.40	16.80	7.40

Quadruple system
4 visible stars in this system

Precise pa	55.2		Precise sep	0.932		Var name	V729 Cyg		Constellation	Cygnus
HIP	101341		Tycho2	3161-01401-1		Gaia DR2	41174418048		BD	BD+40 4220
Distance	657.89		Distance ly	2146.04

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20324+4118	HER 3	AB	2007	6	54	0.9	9.40	11.94	O7e	N	203222.42+411818.9
20324+4118	HER 3	AB	2018	10	55	0.9	9.40	11.94	O7I+O7I	NV	203222.42+411818.9

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