Star · A0V
21 CVn
21 CVn is a main-sequence star of spectral type A0V in the constellation Canes Venatici, 278.8 light-years from the Sun.
| Other names | HIP 64906 |
|---|---|
| Constellation | Canes Venatici |
| Distance | 278.8 light-years (85.5 pc) |
| Apparent magnitude | magnitude 5.14 |
| Absolute magnitude | magnitude 0.48 |
| Spectral type | A0V |
| Surface temperature | 10,780 K |
| Luminosity | 85.7 L☉ |
| Radius | 2.65 R☉ |
| Mass | 3.24 M☉ (estimated) |
| Right ascension (J2000) | 13h 18m 14.5s |
| Declination (J2000) | +49° 40′ 55″ |
| Space velocity (relative to the Sun) | 16.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.14). Visible from the whole Northern Hemisphere and south to latitude 40° S. North of latitude 40° N it never sets. It stands highest at midnight in April, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1747. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.9 million years.
The Sun seen from there
From a planet around 21 CVn, the Sun would look like a star of magnitude 9.49, in the direction where our sky has the constellation Phoenix. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 64923 4.08 light-years
- HIP 64950 12.5 light-years
- HIP 64481 13.1 light-years
- HIP 65800 13.6 light-years
- HIP 63774 16.6 light-years
- HIP 64502 17.0 light-years
- HIP 66090 18.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.