Star · O7
29 CMa
29 CMa is a giant star of spectral type O7 in the constellation Canis Major, 3,815 light-years from the Sun.
| Other names | HIP 35412 |
|---|---|
| Constellation | Canis Major |
| Distance | 3,815 light-years (1,170 pc) |
| Apparent magnitude | magnitude 4.88 |
| Absolute magnitude | magnitude −5.46 |
| Spectral type | O7 |
| Surface temperature | 12,690 K |
| Luminosity | 27,900 L☉ |
| Radius | 34.6 R☉ |
| Mass | 16.9 M☉ (estimated) |
| Right ascension (J2000) | 7h 18m 40.4s |
| Declination (J2000) | −24° 33′ 31″ |
| Space velocity (relative to the Sun) | 28.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.88). Visible from the whole Southern Hemisphere and north to latitude 65° N. South of latitude 65° 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 1790 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 68 million years.
The Sun seen from there
From a planet around 29 CMa, the Sun would look like a star of magnitude 15.17, 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.