Star · M2
Gl 731
Gl 731 is a main-sequence star of spectral type M2 in the constellation Hercules, 49.6 light-years from the Sun.
| Other names | HIP 92573 |
|---|---|
| Constellation | Hercules |
| Distance | 49.6 light-years (15.2 pc) |
| Apparent magnitude | magnitude 10.16 |
| Absolute magnitude | magnitude 9.25 |
| Spectral type | M2 |
| Surface temperature | 3,880 K |
| Luminosity | 0.0566 L☉ |
| Radius | 0.528 R☉ |
| Mass | 0.488 M☉ (estimated) |
| Right ascension (J2000) | 18h 51m 51.1s |
| Declination (J2000) | +16° 34′ 59″ |
| Space velocity (relative to the Sun) | 41.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.16. Visible from the whole Northern Hemisphere and south to latitude 73° S. North of latitude 73° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1976. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 880 thousand years.
The Sun seen from there
From a planet around Gl 731, the Sun would look like a star of magnitude 5.74, in the direction where our sky has the constellation Canis Major. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.