Star · M0V
GJ 42991
GJ 42991 is a main-sequence star of spectral type M0V in the constellation Lacerta, 144.5 light-years from the Sun.
| Other names | HIP 112823 |
|---|---|
| Constellation | Lacerta |
| Distance | 144.5 light-years (44.3 pc) |
| Apparent magnitude | magnitude 11.55 |
| Absolute magnitude | magnitude 8.32 |
| Spectral type | M0V |
| Surface temperature | 3,650 K |
| Luminosity | 0.18 L☉ |
| Radius | 1.06 R☉ |
| Mass | 0.652 M☉ (estimated) |
| Right ascension (J2000) | 22h 50m 53.8s |
| Declination (J2000) | +36° 03′ 58″ |
| Space velocity (relative to the Sun) | 84.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.55. Visible from the whole Northern Hemisphere and south to latitude 54° S. North of latitude 54° N it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1882. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.6 million years.
The Sun seen from there
From a planet around GJ 42991, the Sun would look like a star of magnitude 8.06, in the direction where our sky has the constellation Antlia. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 113076 5.01 light-years
- HIP 113174 6.19 light-years
- HIP 113660 10.1 light-years
- HIP 110642 14.0 light-years
- HIP 113535 14.0 light-years
- HIP 112219 15.5 light-years
- HIP 113695 16.1 light-years
- HIP 113785 17.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.