Star · B2
47 Lib
47 Lib is a main-sequence star of spectral type B2 in the constellation Libra, 850.2 light-years from the Sun.
| Other names | HIP 77939 |
|---|---|
| Constellation | Libra |
| Distance | 850.2 light-years (260.7 pc) |
| Apparent magnitude | magnitude 5.95 |
| Absolute magnitude | magnitude −1.13 |
| Spectral type | B2 |
| Surface temperature | 10,290 K |
| Luminosity | 349 L☉ |
| Radius | 5.88 R☉ |
| Mass | 4.84 M☉ (estimated) |
| Right ascension (J2000) | 15h 55m 00.4s |
| Declination (J2000) | −19° 22′ 59″ |
| Space velocity (relative to the Sun) | 21.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.95). Visible from the whole Southern Hemisphere and north to latitude 71° N. South of latitude 71° 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 1176. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 15 million years.
The Sun seen from there
From a planet around 47 Lib, the Sun would look like a star of magnitude 11.91, in the direction where our sky has the constellation Taurus. 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.