Star · M4V
2MASS J21543318+5942187
2MASS J21543318+5942187 is a main-sequence star of spectral type M4V in the constellation Cepheus, 50.6 light-years from the Sun.
| Constellation | Cepheus |
|---|---|
| Distance | 50.6 light-years (15.5 pc) |
| Apparent magnitude | magnitude 23.16 |
| Absolute magnitude | magnitude 22.21 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 2.05 × 10⁻⁶ L☉ |
| Radius | 0.0054 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 21h 54m 33.2s |
| Declination (J2000) | +59° 42′ 18″ |
| Space velocity (relative to the Sun) | 36.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 23.16. Visible from the whole Northern Hemisphere and south to latitude 30° S. North of latitude 30° 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 1975. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 897 thousand years.
The Sun seen from there
From a planet around 2MASS J21543318+5942187, the Sun would look like a star of magnitude 5.78, in the direction where our sky has the constellation Carina. It would be visible 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.