Star · A3V
20 Com
20 Com is a main-sequence star of spectral type A3V in the constellation Coma Berenices, 270.4 light-years from the Sun.
| Other names | HIP 60957 |
|---|---|
| Constellation | Coma Berenices |
| Distance | 270.4 light-years (82.9 pc) |
| Apparent magnitude | magnitude 5.68 |
| Absolute magnitude | magnitude 1.09 |
| Spectral type | A3V |
| Surface temperature | 9,100 K |
| Luminosity | 37.9 L☉ |
| Radius | 2.48 R☉ |
| Mass | 2.57 M☉ (estimated) |
| Right ascension (J2000) | 12h 29m 43.2s |
| Declination (J2000) | +20° 53′ 46″ |
| Space velocity (relative to the Sun) | 19.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.68). Visible from the whole Northern Hemisphere and south to latitude 69° S. North of latitude 69° 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 1756. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.8 million years.
The Sun seen from there
From a planet around 20 Com, the Sun would look like a star of magnitude 9.42, in the direction where our sky has the constellation Cetus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- SDSS J123322.63+213805.1 6.43 light-years
- 26 Com 10.7 light-years
- HIP 60347 13.4 light-years
- HIP 61151 15.4 light-years
- 8 Com 16.3 light-years
- HIP 60611 16.9 light-years
- 21 Com 17.4 light-years
- HIP 60706 17.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.