Star · G2V
Gl 831B
Gl 831B is a main-sequence star of spectral type G2V in the constellation Capricornus, 24.3 light-years from the Sun.
| Constellation | Capricornus |
|---|---|
| Distance | 24.3 light-years (7.46 pc) |
| Apparent magnitude | magnitude 14.90 |
| Absolute magnitude | magnitude 15.54 |
| Spectral type | G2V |
| Surface temperature | 5,780 K |
| Luminosity | 5.66 × 10⁻⁵ L☉ |
| Radius | 0.00751 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 21h 31m 19.0s |
| Declination (J2000) | −9° 47′ 25″ |
| Space velocity (relative to the Sun) | 44.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.90. Visible from the whole Southern Hemisphere and north to latitude 80° 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 2002. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 432 thousand years.
The Sun seen from there
From a planet around Gl 831B, the Sun would look like a star of magnitude 4.19, in the direction where our sky has the constellation Leo. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.