Star · O9I
HIP 81305
HIP 81305 is a supergiant star of spectral type O9I in the constellation Scorpius, 4,291 light-years from the Sun.
| Constellation | Scorpius |
|---|---|
| Distance | 4,291 light-years (1,316 pc) |
| Apparent magnitude | magnitude 5.46 |
| Absolute magnitude | magnitude −5.14 |
| Spectral type | O9I |
| Surface temperature | 7,230 K |
| Luminosity | 9,690 L☉ |
| Radius | 62.8 R☉ |
| Mass | 12.5 M☉ (estimated) |
| Right ascension (J2000) | 16h 36m 22.6s |
| Declination (J2000) | −42° 51′ 32″ |
| Space velocity (relative to the Sun) | 46.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.46). Visible from the whole Southern Hemisphere and north to latitude 47° N. South of latitude 47° 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 4,291 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 76 million years.
The Sun seen from there
From a planet around HIP 81305, the Sun would look like a star of magnitude 15.43, in the direction where our sky has the constellation Perseus. 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.