Star · M
GJ 3920
GJ 3920 is a main-sequence star of spectral type M in the constellation Hercules, 68.8 light-years from the Sun.
| Other names | HIP 77514 |
|---|---|
| Constellation | Hercules |
| Distance | 68.8 light-years (21.1 pc) |
| Apparent magnitude | magnitude 12.84 |
| Absolute magnitude | magnitude 11.22 |
| Spectral type | M |
| Surface temperature | 2,980 K |
| Luminosity | 0.0511 L☉ |
| Radius | 0.851 R☉ |
| Mass | 0.475 M☉ (estimated) |
| Right ascension (J2000) | 15h 49m 36.6s |
| Declination (J2000) | +51° 02′ 55″ |
| Space velocity (relative to the Sun) | 74.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.84. Visible from the whole Northern Hemisphere and south to latitude 39° S. North of latitude 39° N it never sets. 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 1957. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
The Sun seen from there
From a planet around GJ 3920, the Sun would look like a star of magnitude 6.45, in the direction where our sky has the constellation Horologium. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- CWISEP J153859.39+482659.1 3.83 light-years
- 2MASS J15461461+4932114 7.37 light-years
- Gl 616.2 7.56 light-years
- GJ 3891 9.30 light-years
- WISE J154459.27+584204.5 9.34 light-years
- θ Dra 9.46 light-years
- HIP 81563 9.46 light-years
- GJ 3911 9.65 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.