18187-1347 DCH 31 GH

Coord 2000	18187-1347		Discov num	DCH  31		Comp	GH		Coord arcsec 2000	18 18 42.20 -13 46 51.6
Date first	1998		Date last	1998		Obs	1
Pa first	253		Pa last	253.2		P.A. Now (θ)	253.2°
Sep first	1.2		Sep last	1.233		Sep. Now (ρ)	1.233"
Mag pri	10.64		Mag sec	15.09		delta mag (ΔM)	4.45		Spectral class	B5 (blue-white)
Pri motion ra	-003		Sec motion ra
Pri motion dec	+001		Sec motion dec
Notes	K (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 Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			18 18 40 -13 46 56	DCH 28 AB	1998	1	225	0.8	11.76	13.96	2.20
Show			18 18 41 -13 46 52	DCH 29 CD	2017	2	185	1.1	9.64	10.63	0.99
Show			18 18 42 -13 46 43	DCH 30 EF	1998	1	136	0.7	11.57	14.15	2.58
Show			18 18 42 -13 46 52	DCH 31 GH	1998	1	253	1.2	10.64	15.09	4.45		<===
Show			18 18 42 -13 47 13	DCH 32 IJ	1998	1	7	0.9	13.36	15.41	2.05

Decuple system
10 estimated visually detectable stars in this system

Constellation

Serpens

Tycho2

5689-00637-1

Gaia DR2

4146600674426016640