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Beta Canis Majoris
Position Beta Cma.png
Location of Β CMa.
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 06h 22m 42s
Declination -17° 57′ 21.3″
Apparent magnitude (V) 1.98
Characteristics
Spectral type B1 II-III
U-B color index -0.98
B-V color index -0.23
Variable type Beta Cephei
Astrometry
Radial velocity (Rv) 34 km/s
Proper motion (μ) RA: -3.45 mas/yr
Dec.: -0.47 mas/yr
Parallax (π) 6.53 ± 0.66 mas
Distance approx. 500 ly
(approx. 150 pc)
Absolute magnitude (MV) -3.95
Details
Mass ? M
Radius ? R
Luminosity 19,000 L
Temperature 22,000 K
Metallicity ?
Rotation 36 km/s.
Age unknown years
Other designations
Murzim, Mirzam, Mirza, 2 Canis Majoris, HR 2294, BD−17°1467, HD 44743, SAO 151428, FK5 243, HIP 30324, GC 8223, CCDM 06227-1757

Beta Canis Majoris (β CMa / β Canis Majoris) is a star in the constellation of Canis Major. It has the traditional name Murzim, Al-Murzim or Mirzam.

The traditional name is Arabic (مرزم) for 'The Herald', and probably refers to its position, heralding Sirius in the night sky (ie, rising before it). Murzim is a variable magnitude blue-white giant star. The brightness of Murzim varies between 1.95 and +2.00 in a six-hour period. It is a Beta Cephei variable star. It is a star which is currently in the final stages of using hydrogen gas for fuel. It will eventually exhaust its supply and begin using helium for fuel instead.

Beta Canis Majoris is located near the far end of the Local Bubble - a cavity in the local Interstellar medium through which the Sun is traveling.

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