| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | 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☉ |
| Luminosity | 1.1 × 105 L☉ |
| Temperature | 14,700 K |
| Rotational velocity (v sin i) | 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, a supergiant 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 it has used up its fuel, it is 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, they are within a hundred light years of each other and probably formed in the same area of space.
In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Thanih al Adzari (تاني ألعذاري - taanii al-aðārii), which was translated into Latin as Secunda Virginum, meaning the second virgin.[1] This star, along with ε CMa (Adhara), δ CMa (Wezen) and η CMa (Aludra), were Al ʽAdhārā (ألعذاري), the Virgins.[2][3]
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