Delta Canis Majoris
Delta Canis Majoris (Latinised from δ Canis Majoris, abbreviated Delta CMa, δ CMa), officially named Wezen /ˈwiːzən/, is a star in the constellation of Canis Major. It is a yellow-white F-type supergiant with an apparent magnitude of +1.83. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 07h 08m 23.48608s |
| Declination | −26° 23′ 35.5474″ |
| Apparent magnitude (V) | 1.824 |
| Characteristics | |
| Spectral type | F8 Ia |
| U−B color index | +0.584 |
| B−V color index | +0.691 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | 34.3 ± 0.9 km/s |
| Proper motion (μ) | RA: –3.12 mas/yr Dec.: +3.31 mas/yr |
| Parallax (π) | 2.03 ± 0.38 mas |
| Distance | approx. 1,600 ly (approx. 490 pc) |
| Absolute magnitude (MV) | –6.86 |
| Details | |
| Mass | 16.9 ± 1.6 M☉ |
| Radius | 215 ± 66 R☉ |
| Luminosity | 82,000 L☉ |
| Surface gravity (log g) | 1.00 ± 0.14 cgs |
| Temperature | 6,390 ± 150 K |
| Metallicity [Fe/H] | 0.24 dex |
| Rotational velocity (v sin i) | 25 km/s |
| Age | 12 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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