18187-1206 SNA 90 Aa,Ab

Coord 2000	18187-1206		Discov num	SNA  90		Comp	Aa,Ab		Coord arcsec 2000	18 18 40.86 -12 06 23.3
Date first	2012		Date last	2012		Obs	1
Pa first	303		Pa last	303.2		P.A. Now (θ)	303.2°
Sep first	0.0		Sep last	0.003		Sep. Now (ρ)	0.003"
Mag pri	7.40		Mag sec	7.60		delta mag (ΔM)	0.2		Spectral class	O5IV+O6IV (blue/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			18 18 41 -12 06 23	SNA 90 Aa,Ab	2012	1	303	0.0	7.40	7.60	0.20		<===
Show			18 18 41 -12 06 23	SNA 90 AB	2012	1	34	3.0	6.63	13.70	7.07
Show			18 18 41 -12 06 23	SNA 90 AC	2012	1	267	7.6	6.63	14.00	7.37

Quadruple system
3 estimated visually detectable stars in this system

Constellation

Serpens

Gaia DR2

4153666106124493696