Beta Canis Majoris
 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 | ? years |
| Other designations | |
Beta Canis Majoris (β CMa / β Canis Majoris) is a star in the constellation of Canis Major. It also has the traditional name Murzim or Murzam.
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 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.
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