Star · M4V
2MASSW J1239272+551537
2MASSW J1239272+551537 is a main-sequence star of spectral type M4V in the constellation Ursa Major, 77.0 light-years from the Sun.
| Constellation | Ursa Major |
|---|---|
| Distance | 77.0 light-years (23.6 pc) |
| Apparent magnitude | magnitude 20.21 |
| Absolute magnitude | magnitude 18.35 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 7.21 × 10⁻⁵ L☉ |
| Radius | 0.032 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 12h 39m 27.3s |
| Declination (J2000) | +55° 15′ 37″ |
| Space velocity (relative to the Sun) | 51.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 20.21. Visible from the whole Northern Hemisphere and south to latitude 35° S. North of latitude 35° N it never sets. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1949. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
The Sun seen from there
From a planet around 2MASSW J1239272+551537, the Sun would look like a star of magnitude 6.69, in the direction where our sky has the constellation Phoenix. 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.