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

V1085 Ori, HR 1690, HD 33647, SAO 112505, BD +0 974, WDS 05117+0031

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

position, motion, parallax:

position (J2000)	RA: 5h 11min 41.4sec	DEC: +0° 30' 53''
position (B1900)	RA: 5h 6min 32.9sec	DEC: +0° 23' 31''
proper motion (J2000)	RA: 0.015 arcsec/a	DEC: 0.003 arcsec/a
radial velocity	20 km/s note: variable radial velocity
rotational velocity	39 km/s (uncertain) (variable)
galactic coordinates	longitude: 200.48°	latitude: -21.79°

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

Period 21.4d.

magnitude

visual magnitude

6.67 (V on UBV Johnson system)

spectral / color information

spectral class	B9Vn
B-V-magnitude	-0.07
U-B-magnitude	-0.32
R-I-magnitude

note (category: spectra):

Hg, Mn star; late type close companion.

variability information

variable star identification

V1085 Ori

note (category: variability):

Amp. 0.003V, 0.565d.

double/multiple star system information

separation	0.1 arcsec
mag difference (of double or brightest multiple)	0.4

note (category: double and multiple data):

Binary.

miscellaneous information

note (category: group membership):

Ori OB1a assoc.

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

position, motion, parallax:

position (J2000)	RA: 5h 11min 41.34sec	DEC: +0° 30' 52.51''	±0.2 arcsec	source: 52
proper motion (J2000)	RA: 0.0001 arcsec/a	DEC: 0.003 arcsec/a		source: 25
radial velocity	20 km/s			source: 25
galactic coord. (B1950)	longitude: 200.48°	latitude: -21.79°

magnitude:

visual	6.67 (observed)	source: 25
photovisual	6.6	source: 2
photographic	6.6	source: 16

spectral information:

spectral class	B9		source: 96
Morgan-Keenan	B9Vn		source: 25
B-magnitude	6.6 ±0.05	B-V-magnitude	-0.07
U-magnitude	6.28 ±0.05	U-B-magnitude	-0.32

variability information:

source of data: 27

variability type	160
var. amplitude	0.1

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0.1 arcsec
magnitude difference between brightest and second brightest component	0.4
position angle	1 °

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
27	Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
52	PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)
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 9min 7.061sec	DEC: +0° 27' 17.35''	±0.045 arcsec
position (J2000)	RA: 5h 11min 41.405sec	DEC: +0° 30' 52.7''
proper motion B1950 (FK4)	RA: 0.0007 arcsec/a	DEC: 0.004 arcsec/a	±0.01 arcsec/a in RA ±0.008 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.001 arcsec/a	DEC: 0.003 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	6.6 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B9
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: 6359
Durchmusterung	BD+00 974
Boss General Catalogue	6359
Henry Draper Catalogue	33647

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

position and proper motion:

position (J2000)	RA: 5h 11.7min	DEC: +0° 31'
proper motion (J2000)	RA: 0.007 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
-	1899	16	324°	0.2''	7.2	7.6	B9Vn	HU 33
	1990		1°	0.1''

discoverer information:

discoverer code	discoverer	reference
HU 33	Hussey, W.J.	-

notes:

note	Round 1951, 1956. One component is a spectroscopic binary. Variable, V1085 Ori.

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

position:

position (equinox 1950.0)

RA: 5h 9min 7.1sec

DEC: +0° 27' 17''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	6.65
magnitute at min. brightness	6.7
photometric system	visual, photovisual or Johnson's V

references

to a study	P.North, AsAp Suppl 55,259,1984.
to a chart/photograph	W.H.Warren, J.E.Hesser, ApJ Suppl 34,115,1977.

miscanellous

ID in the GCVS catalogue	60/1085
constellation	Orion
notes on existence	The star is equivalent to '67103'.

variability type description

variability type

description

ACV

Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.