20324+4118 HER 3 AB (V729 Cyg)

20^h 32^m 22.42^s +41° 18' 18.9" P.A. 55.00 sep 0.9 mag 9.40,11.94 Sp O7I+O7I dist. 657.89 pc (2146.04 l.y.)

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	11
Pa first	65	Pa last	55.2	P.A. Now (θ)	55.2°
Sep first	1.5	Sep last	0.932	Sep. Now (ρ)	0.932"
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)

rPM=0.493

This double is physical.

20324+4118 SYSTEM COMPONENTS

Sextuple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Var name	V729 Cyg		Constellation	Cygnus		HIP	101341		Tycho2	3161-01401-1
Gaia DR2	2067830941174418048		BD	BD+40 4220		Distance	657.89		Distance ly	2146.04