Star · B9III
10 Cas
10 Cas is a giant star of spectral type B9III in the constellation Cassiopeia, 957.3 light-years from the Sun.
| Other names | HIP 531 |
|---|---|
| Constellation | Cassiopeia |
| Distance | 957.3 light-years (293.5 pc) |
| Apparent magnitude | magnitude 5.57 |
| Absolute magnitude | magnitude −1.77 |
| Spectral type | B9III |
| Surface temperature | 10,420 K |
| Luminosity | 642 L☉ |
| Radius | 7.77 R☉ |
| Mass | 5.76 M☉ (estimated) |
| Right ascension (J2000) | 0h 06m 26.5s |
| Declination (J2000) | +64° 11′ 46″ |
| Space velocity (relative to the Sun) | 13.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.57). Visible from the whole Northern Hemisphere and south to latitude 26° S. North of latitude 26° N it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1069. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 17 million years.
The Sun seen from there
From a planet around 10 Cas, the Sun would look like a star of magnitude 12.17, in the direction where our sky has the constellation Crux. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.