Star · B1I
15 CMa
15 CMa is a supergiant star of spectral type B1I in the constellation Canis Major, 1,216 light-years from the Sun.
| Other names | HIP 33092 |
|---|---|
| Constellation | Canis Major |
| Distance | 1,216 light-years (372.9 pc) |
| Apparent magnitude | magnitude 4.82 |
| Absolute magnitude | magnitude −3.04 |
| Spectral type | B1I |
| Surface temperature | 13,880 K |
| Luminosity | 3,630 L☉ |
| Radius | 10.4 R☉ |
| Mass | 9.45 M☉ (estimated) |
| Right ascension (J2000) | 6h 53m 32.9s |
| Declination (J2000) | −20° 13′ 27″ |
| Space velocity (relative to the Sun) | 30.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.82). Visible from the whole Southern Hemisphere and north to latitude 70° N. South of latitude 70° 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 the year 810. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 22 million years.
The Sun seen from there
From a planet around 15 CMa, the Sun would look like a star of magnitude 12.69, 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.