Star · M4V
SDSS J120821.72+445224.6
SDSS J120821.72+445224.6 is a main-sequence star of spectral type M4V in the constellation Ursa Major, 319.6 light-years from the Sun.
| Constellation | Ursa Major |
|---|---|
| Distance | 319.6 light-years (98.0 pc) |
| Apparent magnitude | magnitude 21.43 |
| Absolute magnitude | magnitude 16.47 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 4.04 × 10⁻⁴ L☉ |
| Radius | 0.0757 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 12h 08m 21.8s |
| Declination (J2000) | +44° 52′ 25″ |
| Space velocity (relative to the Sun) | 29.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.43. Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° 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 1706. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.7 million years.
The Sun seen from there
From a planet around SDSS J120821.72+445224.6, the Sun would look like a star of magnitude 9.79, 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):
- HIP 58994 8.26 light-years
- HIP 59932 11.9 light-years
- HIP 58382 15.6 light-years
- HIP 59085 18.2 light-years
- HIP 59651 19.5 light-years
- HIP 60305 20.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.