Star · ?
GJ 4012
GJ 4012 is a white dwarf of spectral type ? in the constellation Ara, 66.0 light-years from the Sun.
| Constellation | Ara |
|---|---|
| Distance | 66.0 light-years (20.2 pc) |
| Apparent magnitude | magnitude 15.80 |
| Absolute magnitude | magnitude 14.27 |
| Spectral type | ? |
| Surface temperature | 8,000 K |
| Luminosity | 1.77 × 10⁻⁴ L☉ |
| Radius | 0.012 R☉ |
| Mass | 0.6 M☉ (estimated) |
| Right ascension (J2000) | 17h 37m 18.0s |
| Declination (J2000) | −54° 26′ 19″ |
| Space velocity (relative to the Sun) | 44.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 15.80. Visible from the whole Southern Hemisphere and north to latitude 36° N. South of latitude 36° 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 GJ 4012, the Sun would look like a star of magnitude 6.36, 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):
- λ Ara 6.37 light-years
- DENIS-P J1756561-480509 8.80 light-years
- WISE J174102.78-464225.5 8.94 light-years
- HIP 90945 9.78 light-years
- ι Pav 12.3 light-years
- CWISE J183207.94-540943.3 12.4 light-years
- WISEA J175328.55-590447.6 12.7 light-years
- GJ 4081 13.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.