Star · M4V
CWISE J121557.87+270154.2
CWISE J121557.87+270154.2 is a main-sequence star of spectral type M4V in the constellation Coma Berenices, 75.0 light-years from the Sun.
| Constellation | Coma Berenices |
|---|---|
| Distance | 75.0 light-years (23.0 pc) |
| Apparent magnitude | magnitude 25.13 |
| Absolute magnitude | magnitude 23.32 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 7.37 × 10⁻⁷ L☉ |
| Radius | 0.00323 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 12h 15m 58.4s |
| Declination (J2000) | +27° 01′ 53″ |
| Space velocity (relative to the Sun) | 50.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 25.13. Visible from the whole Northern Hemisphere and south to latitude 63° S. North of latitude 63° 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 1951. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.3 million years.
The Sun seen from there
From a planet around CWISE J121557.87+270154.2, the Sun would look like a star of magnitude 6.64, in the direction where our sky has the constellation Sculptor. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 9404 3.50 light-years
- GJ 3724 6.26 light-years
- GJ 3730 6.66 light-years
- GJ 3739 7.27 light-years
- CWISE J123228.86+225714.5 7.80 light-years
- GJ 1163 8.59 light-years
- 2MASSI J1204303+321259 8.77 light-years
- GJ 3734 9.96 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.