Star · B2III
σ Lup
σ Lup is a giant star of spectral type B2III in the constellation Lupus, 648.2 light-years from the Sun.
| Other names | HIP 71121 |
|---|---|
| Constellation | Lupus |
| Distance | 648.2 light-years (198.7 pc) |
| Apparent magnitude | magnitude 4.44 |
| Absolute magnitude | magnitude −2.05 |
| Spectral type | B2III |
| Surface temperature | 13,050 K |
| Luminosity | 1,280 L☉ |
| Radius | 7 R☉ |
| Mass | 7.02 M☉ (estimated) |
| Right ascension (J2000) | 14h 32m 37.1s |
| Declination (J2000) | −50° 27′ 26″ |
| Space velocity (relative to the Sun) | 32.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.44). 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 April, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1378. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 11 million years.
The Sun seen from there
From a planet around σ Lup, the Sun would look like a star of magnitude 11.32, in the direction where our sky has the constellation Andromeda. 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.