Star · M4V
SDSS J213151.87-001432.4
SDSS J213151.87-001432.4 is a main-sequence star of spectral type M4V in the constellation Aquarius, 570.8 light-years from the Sun.
| Constellation | Aquarius |
|---|---|
| Distance | 570.8 light-years (175.0 pc) |
| Apparent magnitude | magnitude 22.87 |
| Absolute magnitude | magnitude 16.65 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 3.42 × 10⁻⁴ L☉ |
| Radius | 0.0696 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 21h 31m 51.9s |
| Declination (J2000) | −0° 14′ 32″ |
| Space velocity (relative to the Sun) | 111.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 22.87. Visible from the whole Southern Hemisphere and north to latitude 90° N. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1455. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 10 million years.
The Sun seen from there
From a planet around SDSS J213151.87-001432.4, the Sun would look like a star of magnitude 11.05, in the direction where our sky has the constellation Hydra. 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.