20023-1157 HU 79 AB (HD 189815)

20^h 02^m 18.63^s -11° 57' 24.7" P.A. 235.00 sep 0.5 mag 10.31,10.26 Sp A8V

Coord 2000	20023-1157		Discov num	HU 79		Comp	AB		Coord arcsec 2000	20 02 18.63 -11 57 24.7
Date first	1899		Date last	1991		Obs	11
Pa first	244		Pa last	234.9		P.A. Now (θ)	234.9°
Sep first	0.6		Sep last	0.54		Sep. Now (ρ)	0.54"
Mag pri	10.31		Mag sec	10.26		delta mag (ΔM)	0.05		Spectral class	A8V (white)
Pri motion ra	-001		Sec motion ra	-001
Pri motion dec	-011		Sec motion dec	-011
Notes

Nature of this double is uncertain.

20023-1157 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 189815	163197	20 02 19 -11 57 25	HU 79 AB	1991	11	235	0.5	10.31	10.26	0.05		<===
Show		163197	20 02 19 -11 57 25	B 2882 AB,C	2005	4	289	3.8	9.53	13.90	4.37

Triple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	HD 189815		Constellation	Sagittarius		SAO	163197		Tycho2	5746-00883-1
Gaia DR2	4189113428946083840		HD	189815		ADS	13268