Star · M4V
SDSS J102116.05+354607.8
SDSS J102116.05+354607.8 is a main-sequence star of spectral type M4V in the constellation Leo Minor, 342.5 light-years from the Sun.
| Constellation | Leo Minor |
|---|---|
| Distance | 342.5 light-years (105.0 pc) |
| Apparent magnitude | magnitude 21.97 |
| Absolute magnitude | magnitude 16.86 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 2.82 × 10⁻⁴ L☉ |
| Radius | 0.0632 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 10h 21m 16.1s |
| Declination (J2000) | +35° 46′ 08″ |
| Space velocity (relative to the Sun) | 34.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.97. Visible from the whole Northern Hemisphere and south to latitude 54° S. North of latitude 54° 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 1684. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.1 million years.
The Sun seen from there
From a planet around SDSS J102116.05+354607.8, the Sun would look like a star of magnitude 9.94, in the direction where our sky has the constellation Piscis Austrinus. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.