Star · M
GJ 2155
GJ 2155 is a main-sequence star of spectral type M in the constellation Pegasus, 73.5 light-years from the Sun.
| Other names | HIP 115680 |
|---|---|
| Constellation | Pegasus |
| Distance | 73.5 light-years (22.5 pc) |
| Apparent magnitude | magnitude 10.56 |
| Absolute magnitude | magnitude 8.79 |
| Spectral type | M |
| Surface temperature | 3,850 K |
| Luminosity | 0.0884 L☉ |
| Radius | 0.667 R☉ |
| Mass | 0.545 M☉ (estimated) |
| Right ascension (J2000) | 23h 26m 12.4s |
| Declination (J2000) | +8° 53′ 38″ |
| Space velocity (relative to the Sun) | 74.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.56. Visible from the whole Northern Hemisphere and south to latitude 81° S. 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 1952. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.3 million years.
The Sun seen from there
From a planet around GJ 2155, the Sun would look like a star of magnitude 6.60, in the direction where our sky has the constellation Crater. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 4329 7.95 light-years
- GJ 4336 7.98 light-years
- GJ 4319 8.02 light-years
- ULAS J232035.28+144829.8 8.59 light-years
- ULAS J232600.40+020139.2 9.07 light-years
- ULAS J234228.97+085620.1 9.95 light-years
- GJ 4345 10.2 light-years
- GJ 4305B 10.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.