catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	w Ori, ome Ori, 47 Ori, HR 1934, HD 37490, SAO 113001, BD +4 1002, FK5: 2423
constellation	Orion

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

position, motion, parallax:

position (J2000)	RA: 5h 39min 11.1sec	DEC: +4° 7' 17''
position (B1900)	RA: 5h 33min 54.3sec	DEC: +4° 3' 52''
proper motion (J2000)	RA: 0.001 arcsec/a	DEC: -0.003 arcsec/a
radial velocity	22 km/s
rotational velocity	194 km/s (uncertain) (variable)
galactic coordinates	longitude: 200.73°	latitude: -14.03°

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

vsini 160k/s also reported.

magnitude

visual magnitude

4.57 (V on UBV Johnson system)

spectral / color information

spectral class	B3IIIe
B-V-magnitude	-0.11
U-B-magnitude	-0.76
R-I-magnitude

variability information

variable star identification

Ome Ori

note (category: variability):

Gamma Cas 4.40 - 4.59V. Var. hydrogen emission.

miscellaneous information

note (category: group membership):

Ori OB1a; in reflection nebula; member assoc. Tau-Ori R1 at 360 pc.

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

position, motion, parallax:

position (J2000)	RA: 5h 39min 11.11sec	DEC: +4° 7' 17.34''	±0.43 arcsec	source: 16
proper motion (J2000)	RA: -0.0008 arcsec/a	DEC: -0.002 arcsec/a		source: 25
radial velocity	22 km/s			source: 25
galactic coord. (B1950)	longitude: 200.74°	latitude: -14.03°

magnitude:

visual	4.363 (observed)	source: 31
photovisual	4.5	source: 2
photographic	4.3	source: 16

spectral information:

spectral class	B3		source: 96
Morgan-Keenan	B3IIIe		source: 25
B-magnitude	4.46 ±0.05	B-V-magnitude	-0.11
U-magnitude	3.7 ±0.05	U-B-magnitude	-0.76

variability information:

source of data: 30

variability type	264
var. amplitude	0.19

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
16	PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
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 36min 32.611sec	DEC: +4° 5' 40.59''	±0.019 arcsec
position (J2000)	RA: 5h 39min 11.12sec	DEC: +4° 7' 17.26''
proper motion B1950 (FK4)	RA: -0.0004 arcsec/a	DEC: 0.001 arcsec/a	±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0002 arcsec/a	DEC: 0 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B3p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 7042
Durchmusterung	BD+04 1002
Boss General Catalogue	7042
Henry Draper Catalogue	37490

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

position:

position (equinox 1950.0)

RA: 5h 36min 32.6sec

DEC: +4° 5' 41''

variability informations:

variability type	GCAS	eruptive variable star
magnitute at max. brightness	4.4
magnitute at min. brightness	4.59
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B2IIIe

references

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

miscanellous

ID in the GCVS catalogue	60/9024
constellation	Orion
notes on existence	The star is equivalent to '0610001 R'.

variability type description

variability type	description
GCAS	Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V.