Star · M2
Gl 839
Gl 839 is a main-sequence star of spectral type M2 in the constellation Cygnus, 83.0 light-years from the Sun.
| Other names | HIP 108092 |
|---|---|
| Constellation | Cygnus |
| Distance | 83.0 light-years (25.4 pc) |
| Apparent magnitude | magnitude 10.30 |
| Absolute magnitude | magnitude 8.27 |
| Spectral type | M2 |
| Surface temperature | 4,060 K |
| Luminosity | 0.112 L☉ |
| Radius | 0.676 R☉ |
| Mass | 0.579 M☉ (estimated) |
| Right ascension (J2000) | 21h 53m 59.0s |
| Declination (J2000) | +41° 46′ 44″ |
| Space velocity (relative to the Sun) | 80.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.30. Visible from the whole Northern Hemisphere and south to latitude 48° S. North of latitude 48° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1943. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.5 million years.
The Sun seen from there
From a planet around Gl 839, the Sun would look like a star of magnitude 6.86, in the direction where our sky has the constellation Vela. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 109537 7.35 light-years
- GJ 4260 8.76 light-years
- HIP 107376 9.21 light-years
- HIP 105406 10.3 light-years
- Gl 850 13.0 light-years
- HIP 106407 13.4 light-years
- Gl 838.3B 13.8 light-years
- GJ 4196 13.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.