Star · F2V
81 Leo
81 Leo is a main-sequence star of spectral type F2V in the constellation Leo, 152.7 light-years from the Sun.
| Other names | HIP 55765 |
|---|---|
| Constellation | Leo |
| Distance | 152.7 light-years (46.8 pc) |
| Apparent magnitude | magnitude 5.58 |
| Absolute magnitude | magnitude 2.23 |
| Spectral type | F2V |
| Surface temperature | 6,930 K |
| Luminosity | 10.9 L☉ |
| Radius | 2.29 R☉ |
| Mass | 1.82 M☉ (estimated) |
| Right ascension (J2000) | 11h 25m 36.4s |
| Declination (J2000) | +16° 27′ 23″ |
| Space velocity (relative to the Sun) | 36.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.58). Visible from the whole Northern Hemisphere and south to latitude 74° S. North of latitude 74° N it never sets. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1873. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.7 million years.
The Sun seen from there
From a planet around 81 Leo, the Sun would look like a star of magnitude 8.18, in the direction where our sky has the constellation Aquarius. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 56321 6.25 light-years
- HIP 55262 9.32 light-years
- HIP 55823 11.0 light-years
- Chertan 11.2 light-years
- PSO J175.2003+16.1403 11.2 light-years
- HIP 55922 12.3 light-years
- HIP 54553 13.6 light-years
- HIP 54383 17.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.