05387-0236 TRN 19 AB,G

Coord 2000	05387-0236		Discov num	TRN  19		Comp	AB,G		Coord arcsec 2000	05 38 44.77 -02 36 00.2
Date first	2001		Date last	2008		Obs	4
Pa first	18		Pa last	20.3		P.A. Now (θ)	20.3°
Sep first	3.1		Sep last	3.224		Sep. Now (ρ)	3.224"
Mag pri	3.76		Mag sec	12.00		delta mag (ΔM)	8.24		Spectral class	O9V+ (blue)
Pri motion ra	+005		Sec motion ra
Pri motion dec	-001		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		132406	05 38 45 -02 36 00	NOI 6 Aa,Ab	2013	26	164	0.0	4.07			Y
Show		132406	05 38 45 -02 36 00	BU 1032 AB	2018	179	70	0.3	4.07	5.27	1.20	Y
Show	Sig Ori	132406	05 38 45 -02 36 00	STF 762 AB,C	2019	46	239	11.4	3.76	8.79	5.03
Show		132406	05 38 45 -02 36 00	STF 762 AB,D	2019	91	83	12.9	3.76	6.56	2.80
Show		132406	05 38 45 -02 36 00	STF 762 AB,E	2019	82	62	41.4	3.76	6.34	2.58
Show		132406	05 38 45 -02 36 00	STF 3135 AB,F	2016	13	324	208.0	3.76	7.86	4.10
Show		132406	05 38 45 -02 36 00	TRN 19 AB,G	2008	4	20	3.2	3.76	12.00	8.24		<===
Show		132406	05 38 45 -02 36 00	SHJ 65 AB,H	2016	7	125	306.9	3.76	8.06	4.30
Show		132406	05 38 45 -02 36 00	SHJ 65 AB,I	2016	6	60	524.7	3.76	8.44	4.68
Show			05 38 44 -02 36 06	CAB 26 Ca,Cb	2007	2	12	2.0	9.10	14.50	5.40
Show			05 38 46 -02 35 59	STF 762 DC	2019	34	252	23.8	6.56	8.79	2.23
Show		132408	05 38 47 -02 35 40	RAS 22 Ea,Eb	2010	3	303	0.3	6.60	11.30	4.70
Show		132408	05 38 47 -02 35 40	STF 762 EC	2019	26	241	52.9	6.34	8.79	2.45
Show		132408	05 38 47 -02 35 40	STF 762 ED	2019	56	232	29.8	6.34	6.56	0.22
Show			05 39 01 -02 38 56	CAB 26 Ha,Hb	2003	0	-1	0.5	13.34
Show			05 38 45 -02 37 57	BOY 24 Ja,Jb	2007	2	317	0.2	10.60	12.80	2.20

16-fold system
10 estimated visually detectable stars in this system

Constellation	Orion		SAO	132406		HIP	26549		Tycho2	4771-01196-1
Gaia DR2	3216486439446556544		HD	37468		HR	1931		GC	7031
ADS	4241		BD	BD-02 1326		Bayer	Sigma Orionis		Bayer name	Sig Ori
Distance	328.95		Distance ly	1073.03		Bayer greek	σ Ori

discov_num	notes	refcode
STF3135	Rabe measures principal stars STF 761 and STF 762.	Rab1923
	1914, 324@, 209.79". This new WDS entry created 02/18/98.
	Spectral types of primary and secondary assigned by ten Brummelaar et	TtB2000
	al., based on adaptive optics observations.
BU 1032	sig Ori = 48 Ori. A is the variable V1030 Ori. This is the brightest
	pair in a trapezium system with at least five components, including
	components C (mag. 8.79, 11", A2V), D (mag. 6.62, 13", B2V), and the
	helium-rich star E, BD-02@1327. A has also been reported to be a short
	period SB2.
	Heintz (1974) gives formulae for the motions AB,C and AB,D.	Hei1974b
	The suspected small RV variation of AB was not confirmed in David
	Dunlap Obs. spectra.
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
	The AB pair has decreased in position angle from 171 deg to 125 deg
	between 1975 and 1994. Fullerton (1990) describes three spectral	Ful1990
	components in the He I 5876 A profile which suggests that one of the
	stars is a double-lined spectroscopic binary (see Bolton, 1974 ApJ
	192, L7). Classifications of the B, C, and D components are from	Hof1991
	Hoffleit & Warren (1991), while the classification for the E	Lev1991b
	component is from Morrell & Levato (1991).	Msn1998a
	AB: Additional notes may be found in Worley (1956).	Wor1956b
	AB: Malkov et al. (2012) derive dynamical, photometric, and
	spectroscopic masses 27.34 +/- 40.70, 25.32, 21.87 Msun, respectively.	Mlk2012
sig Ori	Aa,Ab: Simon-Diaz et al. (2015) derive a new spectroscopic orbit for
	the primary (sig Ori Aa,Ab) as well as astrometry and photometry for
	the AB pair. New values for mass, log g, age, Teff, etc are derived
	for Aa, Ab, and B.	SiD2015
NOI 6	Aa,Ab: Schaefer et al. (2016) resolved the primary of sig Ori A and
	derive a new combined solution, as well as a new orbit of the AB pair.
	Derived masses for Aa, Ab, and B are 16.99 +/- 0.20, 12.81 +/- 0.18,
	and 11.54 +/- 1.15 Msun, respectively. They also derive a parallax of
	2.5806 +/- 0.0088 mas, corresponding to distance 387.51 +/- 0.12 pc.	NOI2016b
	Spectral type of Aa 09.5V, Ab B0.5V	Opl2023
STF 762	AB,C: H 2 11.	MEv2010
	Sigma Ori E (V1030 Ori) has a strong magnetic field and a magnetosphere	IAU2014a
	with two clouds of plasma constrained by magnetic and centrifugal
	forces which co-rotate with the 1.19d period of the star which results
	in eclipse features.
	Note that the C component was first resolved by Dawes while D and E	Da_1835
	were first resolved by Mayer. However, the discovery designation is	MyC1784
	maintained due to the long standing historical designations.
STF3135	AB,F: F component = primary of 05386-0233 STF 761.
RAS 22	Ea,Eb: Helium star V1030 Ori, type B2; spectral type of Eb estimated
	as late-A.	Ras2014
CAB 26	Ha,Hb: [W96] 4771-899 = Mayrit 528005
BOY 24	Ja,Jb: sig Ori IRS 1 = Mayrit 3020	Boy2009

refcode	metd	author	reference
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
Boy2009	A j	Bouy, H., Huelamo, N., Martin, E.L., Marchis, F., Barrado Y Navascues, D.,	2009A&A...493..931B
Boy2009		Kolb, J.,Marchetti, E., Petr-Gotzens, M.G., Sterzik, M., Ivanov, V.D., Kohler, R.,
Boy2009		& Nurnberger, D.
Boy2009		A&A 493, 931, 2009
Da_1835	Ma -	Dawes, W.R.	1835MmRAS...8...61D
Da_1835		MemRAS 8, 61, 1835
Ful1990	-	Fullerton, A.W.	.
Ful1990		PhD thesis, Univ. of Toronto, 1990
Hei1974b	orb -	Heintz, W.D.	1974AJ.....79..397H
Hei1974b		AJ 79, 397, 1974
Hof1991	-	Hoffleit, D. & Jaschek, C.	1991bsc..book.....H
Hof1991		The Bright Star Catalogue, Fifth Revised Edition (preliminary version), 1991
IAU2014a	-	Oksala, M. (IAU Symposium 307, in press)	.
Lev1991b	-	Morrell, N. & Levato, H.	1991ApJS...75..965M
Lev1991b		ApJS 75, 965, 1991
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Mlk2012	not -	Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A.	2012A&A...546A..69M
Mlk2012		A&A 546, A69, 2012
Msn1998a	Sc j	Mason, B.D., Gies, D.R., Hartkopf, W.I., Bagnuolo, Jr., W.G.,	1998AJ....115..821M
Msn1998a		ten Brummelaar, T.A., & McAlister, H.A.
Msn1998a		AJ 115, 821, 1998
MyC1784	-	Mayer, Ch.	.
MyC1784		"Verzeichniss aller Doppelsterne"
MyC1784		(Directory of all hitherto discovered doubled stars) in "Astronomisches Jahrbuch
MyC1784		fur das Jahr 1784" by J.E. Bode, pp 183-186
MyC1784		(Note: this is the first known double star catalog)
NOI2016b	Kn j	Schaefer, G.H., Hummel, C.A., Gies, D.R., Zavala, R.T., Monnier, J.D.,	2016AJ....152..213S
NOI2016b		Walter, F.M., Turner, N.H., Baron, F., ten Brummelaar, T., Che, X.,
NOI2016b		Farrington, C.D., Kraus, S., Sturmann, J., & Sturmann, L.
NOI2016b		AJ 152, 213, 2016 (see also CIA2016c)
Opl2023	-	Oplistilova, A., Mayer, P., Harmanec, P. et al.	2023A&A...672A..31O
Opl2023		A&A 672, A31, 2023
Rab1923	Ma -	Rabe, W.	1923AN....217..413R
Rab1923		AN 217, 413, 1923
Ras2014	S j	Rastegaev, D.A., Balega, Y.Y., Dyachenko, V.V., Maksimov, A.F., & Malogolovets, E.	2014AstBu..69..296R
Ras2014		Astrophys. Bull. 69, 296, 2014
SiD2015	orb j	Simon-Diaz, S., Caballero, J.A., Lorenzo, J., Maiz Apellaniz, J., Schneider, F.R.,	2015ApJ...799..169S
SiD2015	+C	Negueruela, I., Barba, R.H., Dorda, R., Marco, A., Montes, D., Pellerin, A.,
SiD2015		Sanchez-Berumudez, S., et al.
SiD2015		ApJ 799, 169, 2015
TtB2000	Ac j	ten Brummelaar, T.A., Mason, B.D., McAlister, H.A., Roberts, L.C., Jr.,	2000AJ....119.2403T
TtB2000		Turner, N.H., Hartkopf, W.I., & Bagnuolo, W.G., Jr.
TtB2000		AJ 119, 2403, 2000 (magnitude differences from Mt. Wilson AO)
Wor1956b	Ma -	Worley, C.E.	1956AJ.....61..162W
Wor1956b		AJ 61, 162, 1956

idgroup	discov	author
1	BU	Burnham, S.W. (BU 1 - 81)
179	CAB	Caballero, J.A.
188	CAB	Caballero, J.A., Montes, D., Klutsch, A., Genebriera, J., Miret, F.X., Tobal, T.,
188	CAB	Cairol, J. & Redraz, S.
199	CAB	Aberasturi, M., Caballero, J.A., Montesinos, B., Galvez-Ortiz, M.C., Solano, E. &
199	CAB	Martin, E.L.
209	CAB	Alonso-Floriano, F.J., Caballero, J.A., Cortes-Contreras, M., Solano, E., &
209	CAB	Montes, D.
218	CAB	Caballero, J.A., de Burgos, A., Alonso-Floriano, F.J., Cabrera-Lavers, A.,
218	CAB	Garcia-Alvarez, D. & Montes, D.
219	SHJ	South, J. & Herschel, J.
236	STF	Struve, F.G.W.
269	TRN	Turner, N.H., ten Brummelaar, T.A., & Mason, B.D.
270	TRN	Turner, N.H., ten Brummelaar, T.A., McAlister, H.A., Mason, B.D., Hartkopf, W.I.,
270	TRN	& Roberts, L.C.
271	TRN	Turner, N.H., ten Brummelaar, T.A., Roberts, L.C., Mason, B.D., Hartkopf, W.I., &
271	TRN	Gies, D.R.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
05387-0236	TRN 19	AB,G	2008	2	20	3.2	3.76	12.00		N D	053844.77-023600.2

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