16542-4151 SNA 54 BC

Coord 2000	16542-4151		Discov num	SNA  54		Comp	BC		Coord arcsec 2000	16 54 13.20 -41 50 32.5
Date first	2012		Date last	2012		Obs	1
Pa first	142		Pa last	142		P.A. Now (θ)	142°
Sep first	1.0		Sep last	1.01		Sep. Now (ρ)	1.01"
Mag pri	7.40		Mag sec	12.23		delta mag (ΔM)	4.83		Spectral class	O9IV (blue)
Pri motion ra	-001		Sec motion ra
Pri motion dec	-002		Sec motion dec
Notes	N V K (See Notes, Proper motion indicates physical, K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	NSV8023	227383	16 54 12 -41 50 57	WFC 183 AB	2022	10	35	31.0	6.39	7.74	1.35
Show			16 54 13 -41 50 32	SNA 54 Ba,Bb	2012	1	348	0.0	7.50	10.80	3.30
Show			16 54 13 -41 50 32	SNA 54 BC	2012	1	142	1.0	7.40	12.23	4.83		<===

Quadruple system
3 estimated visually detectable stars in this system

Constellation

Scorpius

Tycho2

7876-02816-1

Gaia DR2

5966509022176616448