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18152-2044
TOK 59 AB
15 Sgr

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

18152-2044 TOK 59 AB (15 Sgr)

18^h 15^m 12.91^s -20° 43' 41.8" P.A. 77.00 sep 1.3 mag 5.40,10.60 Sp B0.5Ia/ab dist. 10000 pc (32620 l.y.)

Coord 2000	18152-2044		Discov num	TOK 59		Comp	AB		Coord arcsec 2000	18 15 12.91 -20 43 41.8
Date first	2008		Date last	2013		Obs	5
Pa first	76		Pa last	76.6		P.A. Now (θ)	76.6°
Sep first	1.3		Sep last	1.277		Sep. Now (ρ)	1.277"
Mag pri	5.40		Mag sec	10.60		delta mag (ΔM)	5.2		Spectral class	B0.5Ia/ab (blue-white)
Pri motion ra	+003		Sec motion ra
Pri motion dec	-001		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

18152-2044 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		186543	18 15 13 -20 43 42	SNA 82 Aa,Ab	2012	4	203	0.0	5.30	8.40	3.10
Show	15 Sgr	186543	18 15 13 -20 43 42	TOK 59 AB	2013	5	77	1.3	5.40	10.60	5.20		<===
Show		186543	18 15 13 -20 43 42	SNA 82 AC	2012	1	356	2.3	5.16	12.91	7.75
Show		186543	18 15 13 -20 43 42	SNA 82 AD	2012	1	108	7.1	5.16	12.18	7.02

Quintuple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	15 Sgr		Constellation	Sagittarius		SAO	186543		HIP	89439
Tycho2	6276-01023-1		Gaia DR2	4093968702062993664		HD	167264		HR	6822
GC	24893		BD	BD-20 5054		Flamsteed	15 Sagittarii		Flamsteed name	15 Sgr
Distance	10000		Distance ly	32620