11387+4507 STF 1561 BC

Coord 2000	11387+4507		Discov num	STF1561		Comp	BC		Coord arcsec 2000	11 38 44.09 +45 06 27.0
Date first	1783		Date last	2015		Obs	20
Pa first	87		Pa last	88.6		P.A. Now (θ)	88.6°
Sep first	44.8		Sep last	179.64		Sep. Now (ρ)	179.64"
Mag pri	8.23		Mag sec	9.46		delta mag (ΔM)	1.23		Spectral class	K2V+F2 (yellow-orange/yellow-white)
Pri motion ra	-571		Sec motion ra	+002
Pri motion dec	-001		Sec motion dec	+003
Notes	N L (See Notes, Linear solution)

rPM=1.004 This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 101177	43841	11 38 45 +45 06 30	STF 1561 AB	2019	161	246	8.9	6.53	8.23	1.70	Y
Show		43841	11 38 45 +45 06 30	STF 1561 AC	2015	28	90	176.8	6.53	9.46	2.93
Show		43841	11 38 45 +45 06 30	STF 1561 AD	2015	5	76	718.2	6.53	7.56	1.03
Show		43841	11 38 45 +45 06 30	STF 1561 AE	2015	13	338	60.7	6.53	12.08	5.55
Show			11 38 44 +45 06 27	STF 1561 BC	2015	20	89	179.6	8.23	9.46	1.23		<===
Show			11 38 44 +45 06 27	STF 1561 BE	2015	10	347	61.7	8.23	12.08	3.85
Show			11 39 00 +45 06 31	STF 1561 CD	2015	6	72	553.1	9.46	7.56	1.90

Quintuple system
5 estimated visually detectable stars in this system

Constellation

Ursa Major

Tycho2

3452-01883-2

Gaia DR2

773861404893710208

discov_num	notes	refcode
STF1561	AB: Secondary is 23.5d SB1; AB has estimated period of 2100y.	Tok2006
	AB: NLTT 28087/28086	Chm2004
	AB: H 3 87.	MEv2010
	AB: B is SB2, P=23.541d	Tok2014d
	AC and AE: Optical pairs, based on study of relative motion of the
	components using the method of apparent motion parameters.	Kiy2008
	AE, BC: Rectilinear solutions by Friedman et al. (2011).	USN2011a
	BE: Rectilinear solution by Hurowitz et al. (2014).	USN2014a

refcode	metd	author	reference
Chm2004	E -	Chaname, J. & Gould, A.	2004ApJ...601..289C
Chm2004		ApJ 601, 289, 2004
Chm2004		(Photometry, coordinates, and astrometry from rNLTT. Astrometry from early
Chm2004		versions of 2MASS and UCAC, with date given only as "circa 2000". Measures
Chm2004		identical to discovery observations - predominantly close pairs - were assumed
Chm2004		not new observations, so not included in WDS. Similar concerns when primary and
Chm2004		secondary magnitudes or proper motions were the same.)
Kiy2008	-	Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S.	2008SvAL...32..405K
Kiy2008		SvAL 34, 405, 2008
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Tok2006	A j	Tokovinin, A., Thomas, S., Sterzik, M., & Udry, S.	2006A&A...450..681T
Tok2006	+E2	A&A 450, 681, 2006
Tok2014d	E2 -	Tokovinin, A.	2014AJ....147...86T
Tok2014d		AJ 147, 86, 2014
USN2011a	lin -	Friedman, E.A., Mason, B.D., & Hartkopf, W.I.	2011IAUDS.175....1F
USN2011a		Inf. Circ. 175, 1, 2011
USN2014a	lin -	Hurowitz, J.L., Hartkopf, W.I., & Mason, B.D.	2014IAUDS.182....1H
USN2014a		Inf. Circ. 182, 1, 2014

idgroup	discov	author
1	STF	Struve, F.G.W.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
11387+4507	STF1561	BC	2002	17	89	173.3	8.23	9.46		N D	113844.09+450627.0
11387+4507	STF1561	BC	2009	18	89	175.0	8.23	9.46		NUD	113844.09+450627.0
11387+4507	STF1561	BC	2012	19	89	178.1	8.23	9.46		NL	113844.09+450627.0
11387+4507	STF1561	BC	2015	20	89	179.6	8.23	9.46	K2V	NL	113844.09+450627.0

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS