Star · M4
Gl 777B
Gl 777B is a main-sequence star of spectral type M4 in the constellation Cygnus, 52.2 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 52.2 light-years (16.0 pc) |
| Apparent magnitude | magnitude 14.37 |
| Absolute magnitude | magnitude 13.35 |
| Spectral type | M4 |
| Surface temperature | 3,550 K |
| Luminosity | 0.00205 L☉ |
| Radius | 0.119 R☉ |
| Mass | 0.128 M☉ (estimated) |
| Right ascension (J2000) | 20h 03m 25.9s |
| Declination (J2000) | +29° 51′ 54″ |
| Space velocity (relative to the Sun) | 65.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.37. Visible from the whole Northern Hemisphere and south to latitude 60° S. North of latitude 60° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1974. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 925 thousand years.
The Sun seen from there
From a planet around Gl 777B, the Sun would look like a star of magnitude 5.85, in the direction where our sky has the constellation Puppis. 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.