Star · K4
GJ 4142
GJ 4142 is a main-sequence star of spectral type K4 in the constellation Aquila, 137.3 light-years from the Sun.
| Other names | HIP 99969 |
|---|---|
| Constellation | Aquila |
| Distance | 137.3 light-years (42.1 pc) |
| Apparent magnitude | magnitude 9.72 |
| Absolute magnitude | magnitude 6.60 |
| Spectral type | K4 |
| Surface temperature | 4,430 K |
| Luminosity | 0.377 L☉ |
| Radius | 1.04 R☉ |
| Mass | 0.784 M☉ (estimated) |
| Right ascension (J2000) | 20h 16m 55.4s |
| Declination (J2000) | +6° 55′ 18″ |
| Space velocity (relative to the Sun) | 66.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.72. Visible from the whole Northern Hemisphere and south to latitude 83° S. 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 1889. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.4 million years.
The Sun seen from there
From a planet around GJ 4142, the Sun would look like a star of magnitude 7.95, in the direction where our sky has the constellation Hydra. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 98965 7.54 light-years
- HIP 99165 7.82 light-years
- HIP 98964 10.6 light-years
- HIP 101856 12.9 light-years
- HIP 101236 13.8 light-years
- HIP 99158 14.7 light-years
- HIP 101597 15.5 light-years
- HIP 101059 17.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.