Star · G3
GJ 4157
GJ 4157 is a main-sequence star of spectral type G3 in the constellation Microscopium, 70.8 light-years from the Sun.
| Other names | HIP 102264 |
|---|---|
| Constellation | Microscopium |
| Distance | 70.8 light-years (21.7 pc) |
| Apparent magnitude | magnitude 6.95 |
| Absolute magnitude | magnitude 5.27 |
| Spectral type | G3 |
| Surface temperature | 5,700 K |
| Luminosity | 0.737 L☉ |
| Radius | 0.88 R☉ |
| Mass | 0.927 M☉ (estimated) |
| Right ascension (J2000) | 20h 43m 16.0s |
| Declination (J2000) | −29° 25′ 26″ |
| Space velocity (relative to the Sun) | 29.2 km/s |
In the sky
Too faint for the naked eye (magnitude 6.95); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 61° N. South of latitude 61° S it never sets. 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 4157, 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):
- GJ 4162 4.42 light-years
- Gl 811 5.64 light-years
- CWISEP J210007.87-293139.8 6.27 light-years
- GJ 9714 7.21 light-years
- Gl 790 8.94 light-years
- WISE J201748.72-342102.5 9.08 light-years
- GJ 4137 10.1 light-years
- Gl 799.1 11.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.