16551-4459 SNA 59 AD

Coord 2000	16551-4459		Discov num	SNA  59		Comp	AD		Coord arcsec 2000	16 55 06.45 -44 59 21.3
Date first	1999		Date last	2015		Obs	3
Pa first	128		Pa last	128.3		P.A. Now (θ)	128.3°
Sep first	7.4		Sep last	7.355		Sep. Now (ρ)	7.355"
Mag pri	6.50		Mag sec	7.00		delta mag (ΔM)	0.5		Spectral class	O6:Ia (blue)
Pri motion ra	+000		Sec motion ra
Pri motion dec	-003		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		227426	16 55 06 -44 59 21	SNA 59 Aa,Ab	2012	2	120	0.1	6.50	9.80	3.30
Show	HD 152386	227426	16 55 06 -44 59 21	CHR 253 AB	2014	2	337	0.6	8.20	11.00	2.80
Show		227426	16 55 06 -44 59 21	SNA 59 AC	2012	1	222	3.5	6.50	12.69	6.19
Show		227426	16 55 06 -44 59 21	SNA 59 AD	2015	3	128	7.4	6.50	7.00	0.50		<===

Quintuple system
4 estimated visually detectable stars in this system

Constellation	Scorpius		SAO	227426		Tycho2	7880-00313-1		Gaia DR2	5964124353254695936
HD	152386