Star · B9
15 Cnc
15 Cnc is a main-sequence star of spectral type B9 in the constellation Cancer, 698.1 light-years from the Sun.
| Other names | HIP 40240 |
|---|---|
| Constellation | Cancer |
| Distance | 698.1 light-years (214.0 pc) |
| Apparent magnitude | magnitude 5.62 |
| Absolute magnitude | magnitude −1.03 |
| Spectral type | B9 |
| Surface temperature | 11,140 K |
| Luminosity | 366 L☉ |
| Radius | 5.14 R☉ |
| Mass | 4.91 M☉ (estimated) |
| Right ascension (J2000) | 8h 13m 08.9s |
| Declination (J2000) | +29° 39′ 24″ |
| Space velocity (relative to the Sun) | 33.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.62). Visible from the whole Northern Hemisphere and south to latitude 60° S. North of latitude 60° N 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 1328. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 12 million years.
The Sun seen from there
From a planet around 15 Cnc, the Sun would look like a star of magnitude 11.48, in the direction where our sky has the constellation Sagittarius. 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.