Star · M4V
2MASS J21555848+2345307
2MASS J21555848+2345307 is a main-sequence star of spectral type M4V in the constellation Pegasus, 143.5 light-years from the Sun.
| Constellation | Pegasus |
|---|---|
| Distance | 143.5 light-years (44.0 pc) |
| Apparent magnitude | magnitude 21.49 |
| Absolute magnitude | magnitude 18.27 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 7.71 × 10⁻⁵ L☉ |
| Radius | 0.033 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 21h 55m 58.5s |
| Declination (J2000) | +23° 45′ 31″ |
| Space velocity (relative to the Sun) | 23.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.49. Visible from the whole Northern Hemisphere and south to latitude 66° S. North of latitude 66° N it never sets. It stands highest at midnight in August, 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 2.5 million years.
The Sun seen from there
From a planet around 2MASS J21555848+2345307, the Sun would look like a star of magnitude 8.05, in the direction where our sky has the constellation Hydra. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 107314 10.4 light-years
- HIP 106394 17.4 light-years
- HIP 109842 17.9 light-years
- HIP 106897 18.3 light-years
- HIP 107040 18.9 light-years
- HIP 106072 19.1 light-years
- HD 209458 19.1 light-years
- HIP 105510 19.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.