Star · B2IV
τ¹ Lup
τ¹ Lup is a subgiant star of spectral type B2IV in the constellation Lupus, 824.4 light-years from the Sun.
| Other names | HIP 70574 |
|---|---|
| Constellation | Lupus |
| Distance | 824.4 light-years (252.8 pc) |
| Apparent magnitude | magnitude 4.56 |
| Absolute magnitude | magnitude −2.45 |
| Spectral type | B2IV |
| Surface temperature | 12,430 K |
| Luminosity | 1,680 L☉ |
| Radius | 8.83 R☉ |
| Mass | 7.58 M☉ (estimated) |
| Right ascension (J2000) | 14h 26m 08.2s |
| Declination (J2000) | −45° 13′ 17″ |
| Space velocity (relative to the Sun) | 32.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.56). Visible from the whole Southern Hemisphere and north to latitude 45° N. South of latitude 45° 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 1202. 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 τ¹ Lup, the Sun would look like a star of magnitude 11.84, 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.