04331+2410 GHE 13 Aa,Ab

Coord 2000	04331+2410		Discov num	GHE  13		Comp	Aa,Ab		Coord arcsec 2000	04 33 06.62 +24 09 54.9
Date first	1990		Date last	2013		Obs	19
Pa first	330		Pa last	284.5		P.A. Now (θ)	354°
Sep first	0.4		Sep last	0.294		Sep. Now (ρ)	0.029"
Mag pri	12.40		Mag sec	14.10		delta mag (ΔM)	1.7		Spectral class	K5+M2.0 (yellow-orange/red)
Pri motion ra	+009		Sec motion ra
Pri motion dec	-018		Sec motion dec
Notes	N V (See Notes, Proper motion indicates physical)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			04 33 07 +24 09 55	GHE 13 Aa,Ab	2013	19	285	0.3	12.40	14.10	1.70	Y	<===
Show			04 33 07 +24 09 55	GHE 13 Aa,b1	2011	27	293	0.2	11.38	13.67	2.29
Show			04 33 07 +24 09 55	GHE 13 Aa,b2	2011	27	293	0.2	11.38	14.48	3.10
Show			04 33 07 +24 09 55	GHE 13 Ab1,2	2011	33	296	0.0	14.80	15.10	0.30
Show			04 33 07 +24 09 55	HAT 9 AB	2000	4	195	21.9	11.20	13.20	2.00
Show			04 33 06 +24 09 34	GHE 12 Ba,Bb	2015	18	283	0.3	13.70	13.90	0.20

Quintuple system
2 estimated visually detectable stars in this system

Constellation

Taurus

Tycho2

1829-00214-1

Gaia DR2

147778490237623808

Identifier	04331+2410
coord_arcsec_2000	043306.62+240954.9

Period (P)	12.312y	± 0.058	Periastron (T)	1999.154y	± 0.07	Semi-major axis (a)	38.59m	± 0.16
Eccentricity (e)	0.2922	± 0.0033	Inclination (i)	151.59°	± 0.89	Longitude of periastron (ω)	50.6°	± 1.3
Node (Ω)	1.8°	± 1.6	Notes	n		Reference	Sfr2012
Equinox			Last observation	2011		Grade	2	(1=Definitive, 9=Indet.)

label theta rho 2000 265.4 0.026 2001 221.1 0.033 2002 193.6 0.040 2003 173.6 0.045 2004 156.5 0.047 2005 140.1 0.047 2006 122.7 0.045 2007 103.3 0.042 2008 80.5 0.039 2009 53.6 0.035 2010 21.2 0.032 2011 339.5 0.027 2012 283.3 0.025 2013 232.6 0.030 2014 201.0 0.038 2015 179.4 0.044 2016 161.7 0.047 2017 145.2 0.047 2018 128.3 0.046 2019 109.6 0.043 2020 88.0 0.040 2021 62.5 0.036 2022 32.0 0.033 2023 354.0 0.029 2024 301.9 0.025 2025 246.1 0.028 2026 209.4 0.036 2027 185.5 0.042 2028 167.0 0.046 2029 150.4 0.047 2030 133.7 0.046		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

discov_num	notes	refcode
GHE 13	Ab1,Ab2: Second and third Schaefer et al. (2006) orbits for Elias 12	Sfr2006
	Na-Nb include a lunar occultation measure by Simon et al. (1995)	Smn1995
	Schaefer et al. (2012) derive spectral types, Teff, luminosities, and
	masses for the Aa, Ab1, and Ab2 components (assuming a distance of
	140pc for M and L) as follows:
	Aa: K7 4060K 1.05 +/-0.20 Lsun 1.040+/-0.016 Msun (Mtotal)
	Ab1: M2 3560 0.447+/-0.058 0.564+/-0.018
	Ab2: M2-M2.5 3560 0.356+/-0.038 0.476+/-0.017	Sfr2012
	Aa,Ab: V807 Tau. Young member of Taurus-Auriga molecular cloud.	Dae2015
HAT 9	AB: Additional notes may be found in Herbig (1962).	Her1962
GHE 12	Ba,Bb: GH Tau. Young member of Taurus-Auriga molecular cloud.	Dae2015

refcode	metd	author	reference
Dae2015	A j	Daemgen, S., Bonavita, M., Jayawardhana, R., Lafreniere, D., & Janson, M.	2015ApJ...799..155D
Dae2015		ApJ 799, 155, 2015
Her1962	Pa -	Herbig, G.H.	1962AdA&A...1...47H
Her1962		Advances Astron. Astrophys. 1, 47, 1962
Her1962		(Exact dates, telescopes, and techniques not given. Default date = decade of
Her1962		publication added.)
Sfr2006	Hf j	Schaefer, G.H., Simon, M., Beck, T.L., Nelan, E., & Prato, L.	2006AJ....132.2618S
Sfr2006	+A	AJ 132, 2618, 2006
Sfr2006		(information slightly updated using information from Sfr2012. Photometry of DF Tau
Sfr2006		= 04271+2542 = THB 1 corrected and converted to V-band by Allen et al. 2017)	2017ApJ...845..161A
Sfr2012	orb j	Schaefer, G.H., Prato, L., Simon, M., & Zavala, R.T.	2012ApJ...756..120S
Sfr2012	+A	ApJ 756, 120, 2012
Sfr2012	+Hf
Smn1995	O j	Simon, M., Ghez, A., Leinert, Ch., Cassar, L., Chen, W.P., Howell, R.R., Jameson,	1995ApJ...443..625S
Smn1995		R.F., Matthews, K., et al.
Smn1995		ApJ 443, 625, 1995

idgroup	discov	author
1	GHE	Ghez, A.M., Neugebauer, G., Gorham, P.W., Haniff, C.A., Kulkarni, S.R., Matthews,
1	GHE	K., Koresko, C., & Beckwith, S.
14	GHE	Ghez, A.M., Duchene, G., Matthews, K., Hornstein, S.D., Tanner, A., Larkin, J.,
14	GHE	Morris, M., Becklin, E.E., et al.
15	GHE	Ghez, A.M., Salim, S., Hornstein,S.D., Tanner, A., Lu, J.R., Morris, M.,
15	GHE	Becklin, E.E., & Duchene, G.
16	GHE	Boehle, A., Ghez, A.M., Schodel, R., Meyer, L., Yelda, S., Albers, S.,
16	GHE	Martinez, G.D., Becklin, E.E., Do, T., Lu, J.R., Matthews, K., Morris, M., et al.
17	HAT	Hartigan, P., Strom, K., & Strom, S.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
04331+2410	GHE 13	Aa,Ab	1998	15	323	0.3	11.20	12.10	M	N D	043306.62+240954.9
04331+2410	GHE 13	Aa,Ab	2005	29	310	0.3	11.20	12.10	M	N D	043306.62+240954.9
04331+2410	GHE 13	Aa,Ab	2009	17	303	0.4	12.40	14.10	K5 M2.0	N	043306.62+240954.9
04331+2410	GHE 13	Aa,Ab	2012	18	290	0.2	12.40	14.10	K5 M2.0	NV	043306.62+240954.9
04331+2410	GHE 13	Aa,Ab	2013	19	285	0.3	12.40	14.10	K5+M2.0	NV	043306.62+240954.9

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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

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