Star · ?
GJ 2139
GJ 2139 is a white dwarf of spectral type ? in the constellation Scutum, 78.8 light-years from the Sun.
| Constellation | Scutum |
|---|---|
| Distance | 78.8 light-years (24.2 pc) |
| Apparent magnitude | magnitude 14.18 |
| Absolute magnitude | magnitude 12.26 |
| Spectral type | ? |
| Surface temperature | 8,570 K |
| Luminosity | 0.00119 L☉ |
| Radius | 0.012 R☉ |
| Mass | 0.6 M☉ (estimated) |
| Right ascension (J2000) | 18h 42m 57.9s |
| Declination (J2000) | −11° 08′ 59″ |
| Space velocity (relative to the Sun) | 65.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.18. Visible from the whole Southern Hemisphere and north to latitude 79° N. South of latitude 79° 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 1947. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
The Sun seen from there
From a planet around GJ 2139, the Sun would look like a star of magnitude 6.75, in the direction where our sky has the constellation Monoceros. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- BD-11 4672 10.5 light-years
- HIP 90147 11.8 light-years
- HIP 93072 13.4 light-years
- HD 176986 14.2 light-years
- HIP 92250 14.4 light-years
- PSO J272.0887-04.9943 14.5 light-years
- Gl 747.1 14.7 light-years
- DENIS-P J1909081-193748 15.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.