Star · M4V
2MASS J21395208+2148397
2MASS J21395208+2148397 is a main-sequence star of spectral type M4V in the constellation Pegasus, 111.9 light-years from the Sun.
| Constellation | Pegasus |
|---|---|
| Distance | 111.9 light-years (34.3 pc) |
| Apparent magnitude | magnitude 21.38 |
| Absolute magnitude | magnitude 18.70 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 5.18 × 10⁻⁵ L☉ |
| Radius | 0.0271 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 21h 39m 52.1s |
| Declination (J2000) | +21° 48′ 40″ |
| Space velocity (relative to the Sun) | 32.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.38. Visible from the whole Northern Hemisphere and south to latitude 68° S. North of latitude 68° 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 1914. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.0 million years.
The Sun seen from there
From a planet around 2MASS J21395208+2148397, the Sun would look like a star of magnitude 7.51, 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):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.