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	Murzim, b CMa, bet CMa, 2 CMa, HR 2294, HD 44743, SAO 151428, BD -17 1467, FK5: 243, WDS 06227-1757
other names	Mirzam, Mirza
constellation	Canis Major

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

note (category: star names):

Murzim; Mirzam; Mirza.

position, motion, parallax:

position (J2000)	RA: 6h 22min 42sec	DEC: -17° 57' 21''
position (2000.72)	RA: 6h 22min 44sec	DEC: -17° 57' 22''
position (B1900)	RA: 6h 18min 17.7sec	DEC: -17° 54' 22''
proper motion (J2000)	RA: -0.006 arcsec/a	DEC: 0 arcsec/a
radial velocity	34 km/s note: spectroscopic binaries
rotational velocity	36 km/s (uncertain) (variable)
trigonometric parallax	0.019 arcsec
galactic coordinates	longitude: 226.06°	latitude: -14.27°

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

0.25002246 and 49d.

magnitude

visual magnitude

1.98 (V on UBV Johnson system)

spectral / color information

spectral class	B1II-III
B-V-magnitude	-0.23
U-B-magnitude	-0.98
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Lyman alpha and Lyman beta observed from COPERNICUS.

note (category: colors):

Color excess E(B-V) = +0.01.

variability information

variable star identification

Bet CMa

note (category: variability):

Beta C 1.93 - 2.00V. Prototype star. Multi-periodic: 0.25002246, 0.2513003, 49.17 and 0.23904d, others reported. Beat periods 49.198, 5.442 and 4.900d. Sp. also var. over 0.25d.

double/multiple star system information

separation	185.9 arcsec
mag difference (of double or brightest multiple)	7.8
note	Worley (1978) update of the IDS

miscellaneous information

note (category: stellar radii or diameters):

Diam. = 0.00050 - 0.00052".

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

position, motion, parallax:

position (J2000)	RA: 6h 22min 41.969sec	DEC: -17° 57' 21.37''	±0.06 arcsec	source: 15
position (2000.72)	RA: 6h 22min 44sec	DEC: -17° 57' 22''	JD: 2451809.16
proper motion (J2000)	RA: -0.0004 arcsec/a	DEC: 0 arcsec/a		source: 25
radial velocity	34 km/s			source: 25
trigonometric parallax	0.019 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 226.06°	latitude: -14.27°

magnitude:

visual	1.93 (observed)	source: 30
photovisual	2	source: 2
photographic	1.8	source: 2

spectral information:

spectral class	B1		source: 96
Morgan-Keenan	B1II-III		source: 25
B-magnitude	1.75 ±0.05	B-V-magnitude	-0.23
U-magnitude	0.77 ±0.05	U-B-magnitude	-0.98

variability information:

source of data: 30

variability type	140
var. amplitude	0.07
var. period	0.25
var. epoch	2441296 10. December 1971, 12:00:00 UT
next max light	2451809.25 21. September 2000, 18:00:00 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	185.9 arcsec
magnitude difference between brightest and second brightest component	7.8
position angle	340 °

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
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
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: 6h 20min 29.789sec	DEC: -17° 55' 47.23''	±0.005 arcsec
position (2000.72)	RA: 6h 22min 44sec	DEC: -17° 57' 23''	JD: 2451809.16
position (J2000)	RA: 6h 22min 41.966sec	DEC: -17° 57' 21.59''
proper motion B1950 (FK4)	RA: -0.0009 arcsec/a	DEC: -0.004 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0005 arcsec/a	DEC: -0.002 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B1
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 243
Durchmusterung	BD-17 1467
Boss General Catalogue	8223
Henry Draper Catalogue	44743

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

position and proper motion:

position (J2000)	RA: 6h 22.7min	DEC: -17° 57'
proper motion (J2000)	RA: -0.006 arcsec/a	DEC: 0 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
-	1879	2	339°	185''	1.98	9.8	B1II-III	BUP 88
	1908		340°	185.9''

discoverer information:

discoverer code	discoverer	reference
BUP 88	-	-

notes:

note	Beta CMa. Prototype of its class of variable. B is BD-17@1466.

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

position:

position (equinox 1950.0)

RA: 6h 20min 29.8sec

DEC: -17° 55' 47''

variability informations:

variability type	BCEP	pulsating variable star
magnitute at max. brightness	1.93
magnitute at min. brightness	2
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2441296.175 10. December 1971, 16:12:00 UT
period [d]	0.25003
next maximum light [JD]	2451809.18641 21. September 2000, 16:28:26 UT

spectral information

spectral class

B1II-III

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	14/9002
constellation	Canis Major
notes on existence	The star is equivalent to '0149009 iot'.
There are notes in published catalog.

variability type description

variability type

description

BCEP

Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.