Star · B9II
HIP 78731
HIP 78731 is a bright giant star of spectral type B9II in the constellation Norma, 762.6 light-years from the Sun.
| Constellation | Norma |
|---|---|
| Distance | 762.6 light-years (233.8 pc) |
| Apparent magnitude | magnitude 6.46 |
| Absolute magnitude | magnitude −0.38 |
| Spectral type | B9II |
| Surface temperature | 10,050 K |
| Luminosity | 169 L☉ |
| Radius | 4.29 R☉ |
| Mass | 3.93 M☉ (estimated) |
| Right ascension (J2000) | 16h 04m 21.3s |
| Declination (J2000) | −53° 42′ 37″ |
| Space velocity (relative to the Sun) | 13.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.46). Visible from the whole Southern Hemisphere and north to latitude 36° N. South of latitude 36° 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 the year 1263. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 14 million years.
The Sun seen from there
From a planet around HIP 78731, the Sun would look like a star of magnitude 11.67, 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.