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	o Cas, omi Cas, 22 Cas, HR 193, HD 4180, SAO 36620, BD +47 183, FK5: 25, WDS 00447+4817
constellation	Cassiopeia

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

position, motion, parallax:

position (J2000)	RA: 0h 44min 43.5sec	DEC: +48° 17' 4''
position (B1900)	RA: 0h 39min 8.9sec	DEC: +47° 44' 14''
proper motion (J2000)	RA: 0.019 arcsec/a	DEC: -0.008 arcsec/a
radial velocity	-17 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible
rotational velocity	260 km/s (uncertain) (variable)
galactic coordinates	longitude: 121.78°	latitude: -14.57°

magnitude

visual magnitude

4.54 (V on UBV Johnson system)

spectral / color information

spectral class	B5IIIe
B-V-magnitude	-0.07
U-B-magnitude	-0.51
R-I-magnitude

note (category: spectra):

Shell star. Also classified B2V, B4ne, B8III, B2-5IVe.

variability information

variable star identification

Omi Cas

note (category: variability):

Gamma Cas, 4.50 - 4.62V, amp. 0.3:R, 1.1679d.

double/multiple star system information

separation	33.6 arcsec
mag difference (of double or brightest multiple)	7.2

note (category: double and multiple data):

CPM. Companion F8.

note (category: spectroscopic binaries):

1033d. K 19.0, V0 -18.7, asini 268.

miscellaneous information

note (category: group membership):

Cas-Tau OB1. Member of Pleiades group.

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

position, motion, parallax:

position (J2000)	RA: 0h 44min 43.524sec	DEC: +48° 17' 3.73''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: 0.002 arcsec/a	DEC: -0.008 arcsec/a		source: 25
radial velocity	-17 km/s			source: 25
galactic coord. (B1950)	longitude: 121.78°	latitude: -14.57°

magnitude:

visual	4.54 (observed)	source: 25
photovisual	4.7	source: 2

spectral information:

spectral class	B2		source: 96
Morgan-Keenan	B5IIIe		source: 25
B-magnitude	4.47 ±0.05	B-V-magnitude	-0.07
U-magnitude	3.96 ±0.05	U-B-magnitude	-0.51

variability information:

source of data: 27

variability type	264
var. amplitude	0.1

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	33.6 arcsec
magnitude difference between brightest and second brightest component	6.7
position angle	302 °

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
27	Catalog of Red Magnitudes (CRM)
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: 0h 41min 55.654sec	DEC: +48° 0' 40''	±0.004 arcsec
position (J2000)	RA: 0h 44min 43.532sec	DEC: +48° 17' 3.74''
proper motion B1950 (FK4)	RA: 0.0019 arcsec/a	DEC: -0.003 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.002 arcsec/a	DEC: -0.008 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 the "Henry Draper Catalogue".

spectral information:

spectral class	B2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 25
Durchmusterung	BD+47 183
Boss General Catalogue	882
Henry Draper Catalogue	4180

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

position and proper motion:

position (J2000)	RA: 0h 44.7min	DEC: +48° 17'
proper motion (J2000)	RA: 0.019 arcsec/a	DEC: -0.008 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
-	1876	11	304°	32.8''	4.54	11.2	B5IIIe	BU 231
	1960		302°	33.6''

discoverer information:

discoverer code	discoverer	reference
BU 231	Burnham, S.W.	-

notes:

note	Omicron Cas. A spectroscopic binary, P = 1033:d.

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

position:

position (equinox 1950.0)

RA: 0h 41min 55.7sec

DEC: +48° 0' 40''

variability informations:

variability type	GCAS	eruptive variable star
magnitute at max. brightness	4.5
magnitute at min. brightness	4.62
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B2-5eIV

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	18/9015
constellation	Cassiopeia
notes on existence	The star is equivalent to '0189017 rho'.
There are notes in published catalog.

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.