Star · M1
Gl 645
Gl 645 is a main-sequence star of spectral type M1 in the constellation Scorpius, 66.2 light-years from the Sun.
| Constellation | Scorpius |
|---|---|
| Distance | 66.2 light-years (20.3 pc) |
| Apparent magnitude | magnitude 11.44 |
| Absolute magnitude | magnitude 9.90 |
| Spectral type | M1 |
| Surface temperature | 3,780 K |
| Luminosity | 0.0351 L☉ |
| Radius | 0.437 R☉ |
| Mass | 0.433 M☉ (estimated) |
| Right ascension (J2000) | 16h 56m 45.4s |
| Declination (J2000) | −37° 03′ 51″ |
| Space velocity (relative to the Sun) | 46.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.44. Visible from the whole Southern Hemisphere and north to latitude 53° N. South of latitude 53° S it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1960. 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 Gl 645, the Sun would look like a star of magnitude 6.37, in the direction where our sky has the constellation Auriga. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Larawag 4.29 light-years
- Gl 646B 5.31 light-years
- Gl 646A 5.36 light-years
- Gaia J171340.47-395211.8 5.71 light-years
- Gl 654.3 6.17 light-years
- GJ 3964 9.04 light-years
- Gaia J164824.31-291310.0 9.26 light-years
- Gl 629 9.81 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.