catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

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

catalogues and names

catalogues and names	y2Ori, psi Ori, 30 Ori, HR 1811, HD 35715, SAO 112775, BD +2 962, WDS 05268+0306A
constellation	Orion

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

position, motion, parallax:

position (J2000)	RA: 5h 26min 50.2sec	DEC: +3° 5' 44''
position (B1900)	RA: 5h 21min 35.8sec	DEC: +3° 0' 33''
proper motion (J2000)	RA: 0.002 arcsec/a	DEC: -0.004 arcsec/a
radial velocity	12 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible
rotational velocity	141 km/s (uncertain) (variable)
trigonometric parallax	-0.016 arcsec
galactic coordinates	longitude: 200.09°	latitude: -17.22°

magnitude

visual magnitude

4.59 (V on UBV Johnson system)

spectral / color information

spectral class	B2IV
B-V-magnitude	-0.21
U-B-magnitude	-0.93
R-I-magnitude

variability information

variable star identification

Psi Ori

note (category: variability):

Ell 4.55 - 4.61V, 4.31 - 4.34B, 2.52596d.

double/multiple star system information

number of components of multiple star system	3
separation	2.7 arcsec
mag difference (of double or brightest multiple)	5.6
component ID	AB

note (category: double and multiple data):

AB about 6300y. B, 10.3V, vsini 96k/s. C, 12.3v at 83", optical.

note (category: spectroscopic binaries):

ADS 4039A, 2.5260d, K 142.8k/s, V0 +15.8k/s, msin3i 8.74, asini 4.95. Apsidal per. 44.8y.

miscellaneous information

note (category: group membership):

Ori OB1a.

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

position, motion, parallax:

position (J2000)	RA: 5h 26min 50.228sec	DEC: +3° 5' 44.27''	±0.43 arcsec	source: 16
proper motion (J2000)	RA: -0.0005 arcsec/a	DEC: -0.009 arcsec/a		source: 25
radial velocity	12 km/s			source: 25
galactic coord. (B1950)	longitude: 200.09°	latitude: -17.22°

magnitude:

visual	4.5 (observed)	source: 31
photovisual	4.7	source: 2
photographic	4.3	source: 16

spectral information:

spectral class	B2		source: 96
Morgan-Keenan	B2IV		source: 25
B-magnitude	4.38 ±0.05	B-V-magnitude	-0.21
U-magnitude	3.45 ±0.05	U-B-magnitude	-0.93

variability information:

source of data: 30

variability type	10
var. amplitude	0.06
var. period	2.53
var. epoch	2438803 11. February 1965, 12:00:00 UT
next max light	2452219.59 6. November 2001, 02:09:36 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	2.7 arcsec
magnitude difference between brightest and second brightest component	5.6
position angle	323 °

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
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 24min 12.93sec	DEC: +3° 3' 14.31''	±0.018 arcsec
position (J2000)	RA: 5h 26min 50.227sec	DEC: +3° 5' 44.31''
proper motion B1950 (FK4)	RA: -0.0001 arcsec/a	DEC: -0.003 arcsec/a	±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0001 arcsec/a	DEC: -0.004 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.7 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B2
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

source catalogue	GC, catalogue number: 6713
Durchmusterung	BD+02 962
Boss General Catalogue	6713
Henry Draper Catalogue	35715

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

position and proper motion:

position (J2000)	RA: 5h 26.8min	DEC: +3° 6'
proper motion (J2000)	RA: 0.003 arcsec/a	DEC: -0.004 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
AB	1863	15	323°	2.7''	4.7	10.3	B2IV	KNT 3
AC	1912	1	196°	83.4''	4.6	13.88	-	KNT 3

discoverer information:

discoverer code	discoverer	reference
KNT 3	Knott, G.	-

notes:

note	Psi (2) Ori. A is a variable, P = 2.52d. a spectroscopic binary.

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

position:

position (equinox 1950.0)

RA: 5h 24min 12.9sec

DEC: +3° 3' 14''

variability informations:

variability type	E/D	close binary eclipsing system
magnitute at max. brightness	4.55
magnitute at min. brightness	4.61
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2438802.914 11. February 1965, 09:56:10 UT
period [d]	2.52596
next maximum light [JD]	2452220.81352 7. November 2001, 07:31:28 UT

spectral information

spectral class

B2IVea+B0

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	60/9023
constellation	Orion
notes on existence	The star is equivalent to '0609024 ome'.
There are notes in published catalog.

variability type description

variability type	description
E	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.
D	Detached systems, with components not filling their inner Roche lobes.