Star · B1II
HIP 81733
HIP 81733 is a bright giant star of spectral type B1II in the constellation Ara, 3,348 light-years from the Sun.
| Constellation | Ara |
|---|---|
| Distance | 3,348 light-years (1,027 pc) |
| Apparent magnitude | magnitude 5.62 |
| Absolute magnitude | magnitude −4.44 |
| Spectral type | B1II |
| Surface temperature | 10,700 K |
| Luminosity | 7,840 L☉ |
| Radius | 25.8 R☉ |
| Mass | 11.8 M☉ (estimated) |
| Right ascension (J2000) | 16h 41m 40.2s |
| Declination (J2000) | −49° 39′ 06″ |
| Space velocity (relative to the Sun) | 15.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.62). Visible from the whole Southern Hemisphere and north to latitude 40° N. South of latitude 40° 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 1323 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 59 million years.
The Sun seen from there
From a planet around HIP 81733, the Sun would look like a star of magnitude 14.89, 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.