Star · B2II
HIP 77645
HIP 77645 is a bright giant star of spectral type B2II in the constellation Norma, 1,975 light-years from the Sun.
| Constellation | Norma |
|---|---|
| Distance | 1,975 light-years (605.6 pc) |
| Apparent magnitude | magnitude 5.74 |
| Absolute magnitude | magnitude −3.17 |
| Spectral type | B2II |
| Surface temperature | 9,920 K |
| Luminosity | 2,160 L☉ |
| Radius | 15.7 R☉ |
| Mass | 8.14 M☉ (estimated) |
| Right ascension (J2000) | 15h 51m 06.8s |
| Declination (J2000) | −55° 03′ 20″ |
| Space velocity (relative to the Sun) | 15.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.74). Visible from the whole Southern Hemisphere and north to latitude 35° N. South of latitude 35° 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 51. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 35 million years.
The Sun seen from there
From a planet around HIP 77645, the Sun would look like a star of magnitude 13.74, 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.