Star · A0
17 Com
17 Com is a main-sequence star of spectral type A0 in the constellation Coma Berenices, 250.9 light-years from the Sun.
| Other names | HIP 60904 |
|---|---|
| Constellation | Coma Berenices |
| Distance | 250.9 light-years (76.9 pc) |
| Apparent magnitude | magnitude 5.29 |
| Absolute magnitude | magnitude 0.86 |
| Spectral type | A0 |
| Surface temperature | 10,880 K |
| Luminosity | 61.5 L☉ |
| Radius | 2.21 R☉ |
| Mass | 2.95 M☉ (estimated) |
| Right ascension (J2000) | 12h 28m 54.7s |
| Declination (J2000) | +25° 54′ 46″ |
| Space velocity (relative to the Sun) | 10.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.29). Visible from the whole Northern Hemisphere and south to latitude 64° S. North of latitude 64° N it never sets. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1775. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.5 million years.
The Sun seen from there
From a planet around 17 Com, the Sun would look like a star of magnitude 9.26, in the direction where our sky has the constellation Sculptor. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 60063 12.7 light-years
- HIP 61151 15.1 light-years
- 7 Com 15.2 light-years
- HIP 60585 17.0 light-years
- HIP 60891 17.5 light-years
- HIP 62129 18.5 light-years
- HIP 62507 19.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.