Star · F6IV
40 Leo
40 Leo is a subgiant star of spectral type F6IV in the constellation Leo, 69.2 light-years from the Sun.
| Other names | Gl 388.1 · HIP 50564 |
|---|---|
| Constellation | Leo |
| Distance | 69.2 light-years (21.2 pc) |
| Apparent magnitude | magnitude 4.78 |
| Absolute magnitude | magnitude 3.15 |
| Spectral type | F6IV |
| Surface temperature | 6,610 K |
| Luminosity | 4.7 L☉ |
| Radius | 1.65 R☉ |
| Mass | 1.47 M☉ (estimated) |
| Right ascension (J2000) | 10h 19m 44.2s |
| Declination (J2000) | +19° 28′ 15″ |
| Space velocity (relative to the Sun) | 32.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.78). Visible from the whole Northern Hemisphere and south to latitude 71° S. North of latitude 71° N it never sets. 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 1957. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
The Sun seen from there
From a planet around 40 Leo, the Sun would look like a star of magnitude 6.46, in the direction where our sky has the constellation Aquarius. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- SDSS J100711.74+193056.2 4.25 light-years
- 39 Leo 5.70 light-years
- Gl 387B 5.73 light-years
- CWISEP J103453.14+161228.0 6.95 light-years
- GJ 2079 7.56 light-years
- GJ 3599 8.56 light-years
- 2MASSI J1029216+162652 9.05 light-years
- GJ 2077 9.48 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.