33 Orionis

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

position, motion, parallax:

position (J2000)	RA: 5h 31min 14.5sec	DEC: +3° 17' 32''
position (B1900)	RA: 5h 25min 59.6sec	DEC: +3° 12' 58''
proper motion (J2000)	RA: 0.001 arcsec/a	DEC: 0.003 arcsec/a
radial velocity	20 km/s note: suspected variable radial velocity
rotational velocity	38 km/s (uncertain) (variable)
dynamical parallax	0.001 arcsec
galactic coordinates	longitude: 200.48°	latitude: -16.17°

magnitude

visual magnitude

5.46
(V on UBV Johnson system)

spectral / color information

double/multiple star system information

number of components of multiple star system	3
separation	1.9 arcsec
mag difference (of double or brightest multiple)	1
component ID	AB

note (category: double and multiple data):

AB fixed. Combined mag., colors.

miscellaneous information

note (category: group membership):

Ori OB1a.

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

position, motion, parallax:

magnitude:

spectral information:

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	1.9 arcsec
magnitude difference between brightest and second brightest component	1.1
position angle	27 °

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
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
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 28min 36.99sec	DEC: +3° 15' 20.92''	ą0.027 arcsec
position (J2000)	RA: 5h 31min 14.523sec	DEC: +3° 17' 32.21''
proper motion B1950 (FK4)	RA: -0.0002 arcsec/a	DEC: 0.004 arcsec/a	ą0.004 arcsec/a in RA ą0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0 arcsec/a	DEC: 0.003 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B3
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

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

position and proper motion:

position (J2000)	RA: 5h 31.2min	DEC: +3° 18'
proper motion (J2000)	RA: 0 arcsec/a	DEC: -0.002 arcsec/a

double/multiple star system information:

discoverer information:

discoverer code	discoverer	reference
STF 729	Struve, F.G.W.	-

notes:

note	33 Ori. Proper motion of B -001 +003.

catalogues and names	33 Ori, HR 1842, HD 36351, SAO 112861, BD +3 948, WDS 05312+0318A
constellation	Orion