Star · B7II
12 CMa
12 CMa is a bright giant star of spectral type B7II in the constellation Canis Major, 706.7 light-years from the Sun.
| Other names | HIP 32504 |
|---|---|
| Constellation | Canis Major |
| Distance | 706.7 light-years (216.7 pc) |
| Apparent magnitude | magnitude 6.07 |
| Absolute magnitude | magnitude −0.61 |
| Spectral type | B7II |
| Surface temperature | 12,670 K |
| Luminosity | 319 L☉ |
| Radius | 3.71 R☉ |
| Mass | 4.72 M☉ (estimated) |
| Right ascension (J2000) | 6h 47m 01.5s |
| Declination (J2000) | −21° 00′ 55″ |
| Space velocity (relative to the Sun) | 22.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.07). Visible from the whole Southern Hemisphere and north to latitude 69° N. South of latitude 69° S it never sets. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1319. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
The Sun seen from there
From a planet around 12 CMa, the Sun would look like a star of magnitude 11.51, in the direction where our sky has the constellation Hercules. 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.