Star · M4V
2MASS J21513979+3402444
2MASS J21513979+3402444 is a main-sequence star of spectral type M4V in the constellation Pegasus, 104.4 light-years from the Sun.
| Constellation | Pegasus |
|---|---|
| Distance | 104.4 light-years (32.0 pc) |
| Apparent magnitude | magnitude 22.20 |
| Absolute magnitude | magnitude 19.67 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 2.12 × 10⁻⁵ L☉ |
| Radius | 0.0173 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 21h 51m 39.8s |
| Declination (J2000) | +34° 02′ 45″ |
| Space velocity (relative to the Sun) | 23.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 22.20. Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° 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 1922. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.9 million years.
The Sun seen from there
From a planet around 2MASS J21513979+3402444, the Sun would look like a star of magnitude 7.36, 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 108481 7.30 light-years
- 2MASS J22120703+3430351 8.29 light-years
- PSO J331.6058+33.0207 10.7 light-years
- HIP 108490 11.9 light-years
- PSO J323.1320+29.5308 12.5 light-years
- HIP 106305 13.4 light-years
- HIP 110716 13.6 light-years
- PSO J318.4243+35.1277 14.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.