Star · B3I
ο² CMa
ο² CMa is a supergiant star of spectral type B3I in the constellation Canis Major, 3,743 light-years from the Sun.
| Other names | HIP 33977 |
|---|---|
| Constellation | Canis Major |
| Distance | 3,743 light-years (1,147 pc) |
| Apparent magnitude | magnitude 3.02 |
| Absolute magnitude | magnitude −7.28 |
| Spectral type | B3I |
| Surface temperature | 11,200 K |
| Luminosity | 117,000 L☉ |
| Radius | 90.7 R☉ |
| Mass | 3.64 M☉ (estimated) |
| Right ascension (J2000) | 7h 03m 01.5s |
| Declination (J2000) | −23° 49′ 59″ |
| Space velocity (relative to the Sun) | 58.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.02). Visible from the whole Southern Hemisphere and north to latitude 66° N. South of latitude 66° S it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 1718 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 66 million years.
The Sun seen from there
From a planet around ο² CMa, the Sun would look like a star of magnitude 15.13, in the direction where our sky has the constellation Vulpecula. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.