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Doubles in session

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18011-1804
A 2256 AB

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

18011-1804 A 2256 AB

18^h 01^m 03.14^s -18° 04' 24.3" P.A. 161.00 sep 0.2 mag 8.80,9.80 Sp B9V

Coord 2000	18011-1804		Discov num	A 2256		Comp	AB		Coord arcsec 2000	18 01 03.14 -18 04 24.3
Date first	1910		Date last	2015		Obs	7
Pa first	148		Pa last	160.7		P.A. Now (θ)	160.7°
Sep first	0.4		Sep last	0.248		Sep. Now (ρ)	0.248"
Mag pri	8.80		Mag sec	9.80		delta mag (ΔM)	1		Spectral class	B9V (blue-white)
Pri motion ra	-002		Sec motion ra
Pri motion dec	-002		Sec motion dec
Notes

Nature of this double is uncertain.

18011-1804 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		160994	18 01 03 -18 04 24	A 2256 AB	2015	7	161	0.2	8.80	9.80	1.00		<===
Show		160994	18 01 03 -18 04 24	A 2256 AB,C	1917	1	4	6.8	8.40	13.90	5.50
Show		160994	18 01 03 -18 04 24	A 2256 AB,D	1998	4	128	7.2	8.40	13.00	4.60
Show	HD 164261	160994	18 01 03 -18 04 24	A 2256 AB,E	2016	4	124	21.9	8.40	12.40	4.00

Quintuple system
6 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Sagittarius		SAO	160994		Tycho2	6255-01015-1		Gaia DR2	4143553966388921728
HD	164261		GC	24507