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Doubles in session

Current system

18301+0404
STF 2322 AC

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

18301+0404 STF 2322 AC

18^h 30^m 05.12^s +04° 03' 55.3" P.A. 295.00 sep 67.2 mag 6.67,12.79 Sp B2V dist. 507.61 pc (1655.82 l.y.)

Coord 2000	18301+0404		Discov num	STF2322		Comp	AC		Coord arcsec 2000	18 30 05.12 +04 03 55.3
Date first	1912		Date last	2015		Obs	10
Pa first	295		Pa last	294.9		P.A. Now (θ)	294.9°
Sep first	66.9		Sep last	67.222		Sep. Now (ρ)	67.222"
Mag pri	6.67		Mag sec	12.79		delta mag (ΔM)	6.12		Spectral class	B2V (blue-white)
Pri motion ra	-001		Sec motion ra	-005
Pri motion dec	-007		Sec motion dec	-004
Notes	N (See Notes)

rPM=0.707

Nature of this double is uncertain.

18301+0404 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		123571	18 30 05 +04 03 55	CHR 72 Aa,Ab	2021	17	285	0.1	6.70	9.60	2.90	Y
Show	HD 170580	123571	18 30 05 +04 03 55	STF 2322 AB	2009	25	172	19.8	6.67	11.28	4.61
Show		123571	18 30 05 +04 03 55	STF 2322 AC	2015	10	295	67.2	6.67	12.79	6.12		<===
Show		123571	18 30 05 +04 03 55	STF 2322 AD	2009	7	197	85.3	6.67	13.39	6.72

Quintuple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Ophiuchus		SAO	123571		HIP	90676		Tycho2	0454-01662-1
Gaia DR2	4284093473916591104		HD	170580		HR	6941		ADS	11399
BD	BD+03 3727		FK5	3469		Distance	507.61		Distance ly	1655.82