18540+3723 BU  137AC

Coord 2000	18540+3723		Discov num	BU  137		Comp	AC		Coord arcsec 2000	18 53 57.56 +37 22 49.7
Date first	1880		Date last	2015		Obs	20
Pa first	142		Pa last	146		P.A. Now (θ)	146°
Sep first	17.9		Sep last	23.6		Sep. Now (ρ)	23.6"
Mag pri	8.69		Mag sec	12.00		delta mag (ΔM)	3.31		Spectral class	G5III-IV (yellow)
Pri motion ra	-021		Sec motion ra	-007
Pri motion dec	+047		Sec motion dec	-011
Notes

rPM=1.159 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		67544	18540+3723	BU 137	AB	1873	2015	129	169	1.5	8.69	9.02	0.33
Show		67544	18540+3723	BU 137	AC	1880	2015	20	146	23.6	8.69	12.00	3.31		<===

Triple system
3 visible stars in this system

Precise pa	145.8		Precise sep	23.617		Constellation	Lyra		SAO	67544
Tycho2	2650-01881-1		Gaia DR2	2094001134684220800		HD	175491

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18540+3723	BU 137	AC	2008	16	146	24.0	8.69	12.00	G5III-IV	D	185357.56+372249.7
18540+3723	BU 137	AC	2012	18	146	24.2	8.69	12.00	G5III-IV	D	185357.56+372249.7
18540+3723	BU 137	AC	2015	20	146	23.6	8.69	12.00	G5III-IV		185357.56+372249.7

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