Star · K4III
31 Leo
31 Leo is a giant star of spectral type K4III in the constellation Leo, 295.9 light-years from the Sun.
| Other names | HIP 49637 |
|---|---|
| Constellation | Leo |
| Distance | 295.9 light-years (90.7 pc) |
| Apparent magnitude | magnitude 4.39 |
| Absolute magnitude | magnitude −0.40 |
| Spectral type | K4III |
| Surface temperature | 3,870 K |
| Luminosity | 410 L☉ |
| Radius | 45 R☉ |
| Mass | 5.07 M☉ (estimated) |
| Right ascension (J2000) | 10h 07m 54.3s |
| Declination (J2000) | +9° 59′ 51″ |
| Space velocity (relative to the Sun) | 60.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.39). Visible from the whole Northern Hemisphere and south to latitude 80° S. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1730. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.2 million years.
The Sun seen from there
From a planet around 31 Leo, the Sun would look like a star of magnitude 9.62, 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 48911 13.6 light-years
- HIP 50424 14.2 light-years
- HIP 49938 18.2 light-years
- HIP 50462 18.5 light-years
- ULAS J100310.96+075220.3 19.7 light-years
- SDSS J101304.34+071050.7 19.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.