Star · B0I
HIP 82171
HIP 82171 is a supergiant star of spectral type B0I in the constellation Ara, 3,702 light-years from the Sun.
| Constellation | Ara |
|---|---|
| Distance | 3,702 light-years (1,135 pc) |
| Apparent magnitude | magnitude 5.55 |
| Absolute magnitude | magnitude −4.73 |
| Spectral type | B0I |
| Surface temperature | 11,510 K |
| Luminosity | 11,700 L☉ |
| Radius | 27.2 R☉ |
| Mass | 13.2 M☉ (estimated) |
| Right ascension (J2000) | 16h 47m 19.7s |
| Declination (J2000) | −58° 20′ 29″ |
| Space velocity (relative to the Sun) | 128.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.55). Visible from the whole Southern Hemisphere and north to latitude 32° N. South of latitude 32° S it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 1677 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 66 million years.
The Sun seen from there
From a planet around HIP 82171, the Sun would look like a star of magnitude 15.11, in the direction where our sky has the constellation Camelopardalis. 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.