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Doubles in session

Current system

12357-1201
STF 1659 AB
HD 109556

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

12357-1201 STF 1659 AB (HD 109556)

12^h 35^m 43.75^s -12° 01' 30.0" P.A. 351.00 sep 28.1 mag 7.94,8.34 Sp G0 dist. 144.51 pc (471.39 l.y.)

Coord 2000	12357-1201		Discov num	STF1659		Comp	AB		Coord arcsec 2000	12 35 43.75 -12 01 30.0
Date first	1828		Date last	2018		Obs	46
Pa first	340		Pa last	351		P.A. Now (θ)	351°
Sep first	20.0		Sep last	28.1		Sep. Now (ρ)	28.1"
Mag pri	7.94		Mag sec	8.34		delta mag (ΔM)	0.4		Spectral class	G0 (yellow)
Pri motion ra	-146		Sec motion ra	-143
Pri motion dec	+019		Sec motion dec	+022
Notes	W

rPM=0.029 (< 0.3, Physical double)

This double is physical.

12357-1201 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 109556	157384	12 35 44 -12 01 30	STF 1659 AB	2018	46	351	28.1	7.94	8.34	0.40		<===
Show		157384	12 35 44 -12 01 30	STF 1659 AC	2018	32	69	43.8	7.94	10.89	2.95
Show		157384	12 35 44 -12 01 30	STF 1659 AD	2018	15	32	189.8	7.94	9.88	1.94
Show		157384	12 35 44 -12 01 30	STF 1659 AE	2018	17	275	151.2	7.94	6.78	1.16
Show		157384	12 35 44 -12 01 30	STF 1659 AF	2018	17	139	209.4	7.94	6.64	1.30
Show			12 35 43 -12 01 03	STF 1659 BC	2018	28	105	46.7	8.34	10.89	2.55
Show		157379	12 35 33 -12 01 16	STF 1659 EF	2018	23	121	333.8	6.78	6.64	0.14
Show		157379	12 35 33 -12 01 16	STF 1659 EG	2015	3	252	12.6	6.78	15.50	8.72

Septuple system
7 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	HD 109556		Constellation	Corvus		SAO	157384		HIP	61466
Tycho2	5530-02065-1		Gaia DR2	3530062006022286592		HD	109556		GC	17160
BD	BD-11 3330		Distance	144.51		Distance ly	471.39