20125+5128 AC 17 AB (HD 192439)

20^h 12^m 31.73^s +51° 27' 49.0" P.A. 82.00 sep 4.4 mag 6.17,10.55 Sp K2.5III dist. 106.16 pc (346.29 l.y.)

Coord 2000	20125+5128		Discov num	AC 17		Comp	AB		Coord arcsec 2000	20 12 31.73 +51 27 49.0
Date first	1859		Date last	2016		Obs	16
Pa first	80		Pa last	82.4		P.A. Now (θ)	82.4°
Sep first	3.9		Sep last	4.364		Sep. Now (ρ)	4.364"
Mag pri	6.17		Mag sec	10.55		delta mag (ΔM)	4.38		Spectral class	K2.5III (yellow-orange)
Pri motion ra	-013		Sec motion ra	-015
Pri motion dec	-016		Sec motion dec	-015
Notes

rPM=0.105 (< 0.3, Physical double)

This double is physical.

20125+5128 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 192439	32354	20 12 32 +51 27 49	AC 17 AB	2016	16	82	4.4	6.17	10.55	4.38		<===
Show		32354	20 12 32 +51 27 49	AC 17 AC	2015	5	9	84.8	6.17	12.63	6.46
Show		32354	20 12 32 +51 27 49	AC 17 AD	2015	5	80	75.1	6.17	12.80	6.63
Show		32354	20 12 32 +51 27 49	AC 17 AE	2015	8	148	130.4	6.17	10.78	4.61

Quintuple system
5 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	HD 192439		Constellation	Cygnus		SAO	32354		HIP	99579
Tycho2	3571-02335-1		Gaia DR2	2088224614133708544		HD	192439		HR	7726
GC	28077		ADS	13535		BD	BD+51 2796		Distance	106.16
Distance ly	346.29