Mintaka

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names):

MINTAKA; Mintika.

position, motion, parallax:

position (J2000)	RA: 5h 32min 0.4sec	DEC: -0° 17' 57''
position (B1900)	RA: 5h 26min 53.8sec	DEC: -0° 22' 23''
proper motion (J2000)	RA: 0.001 arcsec/a	DEC: -0.002 arcsec/a
radial velocity	16 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	152 km/s (uncertain) (variable)
trigonometric parallax	0.014 arcsec
galactic coordinates	longitude: 203.86°	latitude: -17.74°

note (category: radial and/or rotational velocities):

Mass ejection at up to 1800k/s.

magnitude

visual magnitude

2.23
(V on UBV Johnson system)

spectral / color information

spectral class	O9.5II
B-V-magnitude	-0.22
U-B-magnitude	-1.05
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Nitrogen deficient. Interstellar Lyman alpha absorption observed by AEROBEE rocket. Also classified B2V, O9.5II, O9.5II-III + B0III.

note (category: colors):

Color excess E(B-V) = +0.07.

variability information

variable star identification

Del Ori

note (category: variability):

ADS 4134A, EA 2.14 - 2.26V, 1.94 - 2.13B, 5.732476d. Intrinsic variability also possible.

double/multiple star system information

number of components of multiple star system	3
separation	51.7 arcsec
mag difference (of double or brightest multiple)	4.6
component ID	AC

note (category: double and multiple data):

Binary with C = HR 1851. Component B, 14.0v at 33".

note (category: spectroscopic binaries):

ADS 4134A, 5.7324d, K 101.0k/s, V0 +20.1k/s, asini 7.92. The first SB in which stationary lines were observed.

miscellaneous information

note (category: group membership):

Ori OB1b3; Orion belt; cluster CR 70.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 5h 32min 0.398sec	DEC: -0° 17' 56.88''	ą0.06 arcsec	source: 15
proper motion (J2000)	RA: 0.0001 arcsec/a	DEC: -0.002 arcsec/a		source: 25
radial velocity	16 km/s			source: 25
trigonometric parallax	0.014 arcsec		ą0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 203.86°	latitude: -17.74°

magnitude:

visual	2.1 (observed)	source: 31
photovisual	2.5	source: 2

spectral information:

spectral class	B0		source: 96
Morgan-Keenan	O9.5II		source: 25
B-magnitude	2.01 ą0.05	B-V-magnitude	-0.22
U-magnitude	0.96 ą0.05	U-B-magnitude	-1.05

variability information:

source of data: 30

variability type	10
var. amplitude	0.12
var. period	5.73
var. epoch	2443873 30. December 1978, 12:00:00 UT
next max light	2452221.61 8. November 2001, 02:38:24 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0.3 arcsec
magnitude difference between brightest and second brightest component	0.1
position angle	138 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	2.1	B0	Mintaka, d Orionis, 34 Ori, HR 1852, HD 36486, SAO 132220
B	6.85	B0	d Orionis, 34 Ori, HR 1851, HD 36485, SAO 132221

sources:

2	HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
19	WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31	CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 5h 29min 27.017sec	DEC: -0° 20' 4.41''	ą0.003 arcsec
position (J2000)	RA: 5h 32min 0.397sec	DEC: -0° 17' 56.81''
proper motion B1950 (FK4)	RA: -0.0002 arcsec/a	DEC: -0.001 arcsec/a	ą0.001 arcsec/a in RA ą0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0001 arcsec/a	DEC: -0.002 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	2.5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 206
Durchmusterung	BD-00 983
Boss General Catalogue	6847
Henry Draper Catalogue	36486

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 5h 32min	DEC: -0° 18'
proper motion (J2000)	RA: 0.001 arcsec/a	DEC: -0.002 arcsec/a

double/multiple star system information:

component	year	number of measures	position angle	angular separation	magnitude of 1st component	magnitude of 2nd component	spectral class(es)	discoverer code
Aa	1978	21	144°	0.2''	3.2	3.3	B0III+O9V	HEI 42
Aa	1991	21	138°	0.3''	3.2	3.3	B0III+O9V	HEI 42
Aa-B	1878	5	227°	32.8''	2.24	14	-	BU 558
Aa-C	1822	22	°	52.5''	2.24	6.84	B4	STF 14

discoverer information:

discoverer code	discoverer	reference
HEI 42		-
BU 558	Burnham, S.W.	-
STF 14	Struve, F.G.W.	-

notes:

note	Delta Ori. A is an Algol-type system, as well as a close visual binary. C is a spectroscopic binary.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 5h 29min 27sec

DEC: -0° 20' 4''

variability informations:

variability type	EA/DM	close binary eclipsing system
magnitute at max. brightness	2.14
magnitute at min. brightness	2.26
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2443872.589 30. December 1978, 02:08:10 UT
period [d]	5.732476
next maximum light [JD]	2452224.806532 11. November 2001, 07:21:24 UT
duration of the eclipse	13 % of period the duration of the light constancy phase at minimum light is equal to zero

spectral information

spectral class

O9.5II-III+B0III

references

to a study	Vol. II GCVS
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	60/9004
constellation	Orion
notes on existence	The star is equivalent to '0609005 eps'.
There are notes in published catalog.

variability type description

variability type	description
EA	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
DM	Detached main-sequence systems. Both components are main-sequence stars and do not fill their inner Roche lobes.

catalogues and names	Mintaka, d Ori, del Ori, 34 Ori, HR 1852, HD 36486, SAO 132220, BD +0 983, FK5: 206, WDS 05320-0018A
other names	Mintika
constellation	Orion