Star · M3
GJ 4109
GJ 4109 is a main-sequence star of spectral type M3 in the constellation Cygnus, 54.7 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 54.7 light-years (16.8 pc) |
| Apparent magnitude | magnitude 12.48 |
| Absolute magnitude | magnitude 11.36 |
| Spectral type | M3 |
| Surface temperature | 3,710 K |
| Luminosity | 0.0102 L☉ |
| Radius | 0.245 R☉ |
| Mass | 0.258 M☉ (estimated) |
| Right ascension (J2000) | 19h 25m 08.7s |
| Declination (J2000) | +28° 21′ 14″ |
| Space velocity (relative to the Sun) | 34.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.48. Visible from the whole Northern Hemisphere and south to latitude 62° S. North of latitude 62° 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 1971. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 971 thousand years.
The Sun seen from there
From a planet around GJ 4109, the Sun would look like a star of magnitude 5.95, in the direction where our sky has the constellation Canis Major. 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.