Star · M1V
SDSS J104001.90+432131.8
SDSS J104001.90+432131.8 is a main-sequence star of spectral type M1V in the constellation Ursa Major, 256.1 light-years from the Sun.
| Constellation | Ursa Major |
|---|---|
| Distance | 256.1 light-years (78.5 pc) |
| Apparent magnitude | magnitude 21.49 |
| Absolute magnitude | magnitude 17.02 |
| Spectral type | M1V |
| Surface temperature | 3,470 K |
| Luminosity | 8.03 × 10⁻⁵ L☉ |
| Radius | 0.0247 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 10h 40m 01.7s |
| Declination (J2000) | +43° 21′ 32″ |
| Space velocity (relative to the Sun) | 47.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.49. Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° N it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1770. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.5 million years.
The Sun seen from there
From a planet around SDSS J104001.90+432131.8, the Sun would look like a star of magnitude 9.30, in the direction where our sky has the constellation Grus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- ω UMa 15.4 light-years
- HIP 53159 16.1 light-years
- HIP 53405 18.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.