Star · G2V
GJ 4039A
GJ 4039A is a main-sequence star of spectral type G2V in the constellation Hercules, 105.9 light-years from the Sun.
| Other names | HIP 87895 |
|---|---|
| Constellation | Hercules |
| Distance | 105.9 light-years (32.5 pc) |
| Apparent magnitude | magnitude 6.32 |
| Absolute magnitude | magnitude 3.76 |
| Spectral type | G2V |
| Surface temperature | 5,810 K |
| Luminosity | 2.88 L☉ |
| Radius | 1.68 R☉ |
| Mass | 1.3 M☉ (estimated) |
| Right ascension (J2000) | 17h 57m 14.3s |
| Declination (J2000) | +23° 59′ 45″ |
| Space velocity (relative to the Sun) | 37.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.32). Visible from the whole Northern Hemisphere and south to latitude 66° S. North of latitude 66° N it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1920. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.9 million years.
The Sun seen from there
From a planet around GJ 4039A, the Sun would look like a star of magnitude 7.39, in the direction where our sky has the constellation Lepus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 88637 5.99 light-years
- 2MASSW J1743415+212707 7.47 light-years
- GJ 4047 11.2 light-years
- HIP 88848 11.5 light-years
- HIP 88913 13.2 light-years
- TOI-6086 13.5 light-years
- PSO J261.2881+22.9269 14.2 light-years
- HIP 86221 14.3 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.