Star · F0V
31 Cap
31 Cap is a main-sequence star of spectral type F0V in the constellation Capricornus, 320.6 light-years from the Sun.
| Other names | HIP 105168 |
|---|---|
| Constellation | Capricornus |
| Distance | 320.6 light-years (98.3 pc) |
| Apparent magnitude | magnitude 7.07 |
| Absolute magnitude | magnitude 2.11 |
| Spectral type | F0V |
| Surface temperature | 7,220 K |
| Luminosity | 12.3 L☉ |
| Radius | 2.24 R☉ |
| Mass | 1.87 M☉ (estimated) |
| Right ascension (J2000) | 21h 18m 15.7s |
| Declination (J2000) | −17° 27′ 44″ |
| Space velocity (relative to the Sun) | 12.0 km/s |
In the sky
Too faint for the naked eye (magnitude 7.07); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 73° N. South of latitude 73° S it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1705. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.7 million years.
The Sun seen from there
From a planet around 31 Cap, the Sun would look like a star of magnitude 9.79, in the direction where our sky has the constellation Cancer. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 104505 15.0 light-years
- HIP 104297 18.1 light-years
- HIP 105892 19.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.