Omicron2 Canis Majoris
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Canis Major |
| Right ascension | 07h 03m 01.5s |
| Declination | −23° 49′ 60″ |
| Apparent magnitude (V) | 3.00 |
| Characteristics | |
| Spectral type | B3Ia |
| U-B color index | −0.80 |
| B-V color index | −0.06 |
| Variable type | α Cyg |
| Astrometry | |
| Radial velocity (Rv) | 48.4 km/s |
| Proper motion (μ) | RA: −1.56 mas/yr Dec.: 4.28 mas/yr |
| Parallax (π) | 1.27 ± 0.56 mas |
| Distance | approx. 3000 ly (approx. 800 pc) |
| Absolute magnitude (MV) | −6.46 |
| Details | |
| Mass | 20 M☉ |
| Radius | ? R☉ |
| Luminosity | 1.1 × 105 L☉ |
| Temperature | 14,700 K |
| Metallicity | ? |
| Rotation | 44 km/s. |
| Age | 8 × 106 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron2 Canis Majoris (ο² CMa / ο² Canis Majoris) is a star in the constellation Canis Major. It is one of the most luminous stars known. This is a supergiant star that has used up the Hydrogen fuel in its core and has entered the evolutionary stage where it is fusing Helium atoms to form Carbon. When this star has used up its fuel, it is considered likely to become a supernova.
ο² Canis Majoris is classified as an Alpha Cygni type variable star and its brightness varies from magnitude +2.98 to +3.04.
The star ο1 Canis Majoris lies nearly along the line of sight with this star, but the two do not form a gravitational pair. However, the two are within a hundred light years of each other and likely formed in the same area of space.
[edit] External links
- Omicron-2 Canis Majoris on Dr. James Kaler's Stars site.
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