Star · A0V
31 Cas
31 Cas is a main-sequence star of spectral type A0V in the constellation Cassiopeia, 305.4 light-years from the Sun.
| Other names | HIP 5518 |
|---|---|
| Constellation | Cassiopeia |
| Distance | 305.4 light-years (93.6 pc) |
| Apparent magnitude | magnitude 5.32 |
| Absolute magnitude | magnitude 0.46 |
| Spectral type | A0V |
| Surface temperature | 10,300 K |
| Luminosity | 80.7 L☉ |
| Radius | 2.82 R☉ |
| Mass | 3.18 M☉ (estimated) |
| Right ascension (J2000) | 1h 10m 39.3s |
| Declination (J2000) | +68° 46′ 43″ |
| Space velocity (relative to the Sun) | 19.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.32). Visible from the whole Northern Hemisphere and south to latitude 21° S. North of latitude 21° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1721. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.4 million years.
The Sun seen from there
From a planet around 31 Cas, the Sun would look like a star of magnitude 9.69, in the direction where our sky has the constellation Musca. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 7992 17.2 light-years
- HIP 7248 18.1 light-years
- HIP 7050 18.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.