Star · ?
GJ 3939
GJ 3939 is a main-sequence star of spectral type ? in the constellation Serpens, 85.9 light-years from the Sun.
| Constellation | Serpens |
|---|---|
| Distance | 85.9 light-years (26.3 pc) |
| Apparent magnitude | magnitude 13.46 |
| Absolute magnitude | magnitude 11.36 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 0.0111 L☉ |
| Radius | 0.263 R☉ |
| Mass | 0.267 M☉ (estimated) |
| Right ascension (J2000) | 16h 07m 28.4s |
| Declination (J2000) | +5° 57′ 53″ |
| Space velocity (relative to the Sun) | 45.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.46. Visible from the whole Northern Hemisphere and south to latitude 84° S. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1940. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.5 million years.
The Sun seen from there
From a planet around GJ 3939, the Sun would look like a star of magnitude 6.93, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3946 3.32 light-years
- HIP 79702 4.36 light-years
- SDSS J161928.31+005011.9 9.01 light-years
- GJ 1201 9.70 light-years
- WISE J163236.47+032927.3 10.4 light-years
- HIP 79137 10.8 light-years
- σ Ser 11.2 light-years
- Gl 615.1A 12.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.