Star · ?
GJ 3121
GJ 3121 is a white dwarf of spectral type ? in the constellation Andromeda, 53.9 light-years from the Sun.
| Other names | HIP 8709 |
|---|---|
| Constellation | Andromeda |
| Distance | 53.9 light-years (16.5 pc) |
| Apparent magnitude | magnitude 12.44 |
| Absolute magnitude | magnitude 11.35 |
| Spectral type | ? |
| Surface temperature | 8,400 K |
| Luminosity | 0.00272 L☉ |
| Radius | 0.012 R☉ |
| Mass | 0.6 M☉ (estimated) |
| Right ascension (J2000) | 1h 52m 03.0s |
| Declination (J2000) | +47° 00′ 06″ |
| Space velocity (relative to the Sun) | 64.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.44. Visible from the whole Northern Hemisphere and south to latitude 43° S. North of latitude 43° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1972. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 955 thousand years.
The Sun seen from there
From a planet around GJ 3121, the Sun would look like a star of magnitude 5.92, in the direction where our sky has the constellation Centaurus. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3136 4.03 light-years
- Gl 67 7.25 light-years
- GJ 1042 7.86 light-years
- Gl 84.2B 10.0 light-years
- Gl 84.2A 10.0 light-years
- WISE J014656.66+423410.0 10.2 light-years
- 2MASSI J0213288+444445 10.3 light-years
- Titawin 11.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.