Star · B8V
HIP 21108
HIP 21108 is a main-sequence star of spectral type B8V in the constellation Perseus, 963.2 light-years from the Sun.
| Constellation | Perseus |
|---|---|
| Distance | 963.2 light-years (295.3 pc) |
| Apparent magnitude | magnitude 6.25 |
| Absolute magnitude | magnitude −1.10 |
| Spectral type | B8V |
| Surface temperature | 10,010 K |
| Luminosity | 326 L☉ |
| Radius | 6 R☉ |
| Mass | 4.74 M☉ (estimated) |
| Right ascension (J2000) | 4h 31m 24.1s |
| Declination (J2000) | +40° 00′ 37″ |
| Space velocity (relative to the Sun) | 23.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.25). Visible from the whole Northern Hemisphere and south to latitude 50° S. North of latitude 50° N it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1063. 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 HIP 21108, the Sun would look like a star of magnitude 12.18, in the direction where our sky has the constellation Scorpius. 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.