Star · K7V
GJ 4140
GJ 4140 is a main-sequence star of spectral type K7V in the constellation Aquila, 70.7 light-years from the Sun.
| Other names | HIP 99764 |
|---|---|
| Constellation | Aquila |
| Distance | 70.7 light-years (21.7 pc) |
| Apparent magnitude | magnitude 10.19 |
| Absolute magnitude | magnitude 8.51 |
| Spectral type | K7V |
| Surface temperature | 4,030 K |
| Luminosity | 0.0932 L☉ |
| Radius | 0.625 R☉ |
| Mass | 0.553 M☉ (estimated) |
| Right ascension (J2000) | 20h 14m 28.2s |
| Declination (J2000) | −7° 16′ 55″ |
| Space velocity (relative to the Sun) | 28.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.19. Visible from the whole Southern Hemisphere and north to latitude 83° N. 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 1955. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.3 million years.
The Sun seen from there
From a planet around GJ 4140, the Sun would look like a star of magnitude 6.51, in the direction where our sky has the constellation Cancer. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 773.3 5.64 light-years
- GJ 4136 7.45 light-years
- GJ 4132 8.38 light-years
- WISEA J201833.67-141720.3 8.87 light-years
- GJ 4155 9.65 light-years
- HD 192263 10.1 light-years
- CWISE J201342.27-032643.7 12.0 light-years
- HIP 101345 12.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.