Star · K0III
θ Lib
θ Lib is a giant star of spectral type K0III in the constellation Libra, 167.4 light-years from the Sun.
| Other names | HIP 77853 |
|---|---|
| Constellation | Libra |
| Distance | 167.4 light-years (51.3 pc) |
| Apparent magnitude | magnitude 4.13 |
| Absolute magnitude | magnitude 0.58 |
| Spectral type | K0III |
| Surface temperature | 4,740 K |
| Luminosity | 79 L☉ |
| Radius | 13.2 R☉ |
| Mass | 3.17 M☉ (estimated) |
| Right ascension (J2000) | 15h 53m 49.5s |
| Declination (J2000) | −16° 43′ 45″ |
| Space velocity (relative to the Sun) | 40.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.13). Visible from the whole Southern Hemisphere and north to latitude 73° N. South of latitude 73° 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 1859. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.0 million years.
The Sun seen from there
From a planet around θ Lib, the Sun would look like a star of magnitude 8.38, in the direction where our sky has the constellation Taurus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 78078 7.18 light-years
- HIP 79203 13.1 light-years
- HIP 76982 13.2 light-years
- HIP 77872 13.6 light-years
- HIP 79169 14.7 light-years
- Zubenelhakrabi 15.2 light-years
- HIP 76582 16.9 light-years
- HIP 76758 17.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.