Star · G2V
Gl 815B
Gl 815B is a main-sequence star of spectral type G2V in the constellation Cygnus, 49.0 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 49.0 light-years (15.0 pc) |
| Apparent magnitude | magnitude 11.90 |
| Absolute magnitude | magnitude 11.02 |
| Spectral type | G2V |
| Surface temperature | 5,780 K |
| Luminosity | 0.00364 L☉ |
| Radius | 0.0602 R☉ |
| Mass | 0.165 M☉ (estimated) |
| Right ascension (J2000) | 21h 00m 04.9s |
| Declination (J2000) | +40° 04′ 11″ |
| Space velocity (relative to the Sun) | 47.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.90. Visible from the whole Northern Hemisphere and south to latitude 50° S. North of latitude 50° N it never sets. 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 1977. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 869 thousand years.
The Sun seen from there
From a planet around Gl 815B, the Sun would look like a star of magnitude 5.71, in the direction where our sky has the constellation Vela. 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.