Star · K5V
GJ 1257
GJ 1257 is a main-sequence star of spectral type K5V in the constellation Capricornus, 78.9 light-years from the Sun.
| Other names | HIP 102119 |
|---|---|
| Constellation | Capricornus |
| Distance | 78.9 light-years (24.2 pc) |
| Apparent magnitude | magnitude 9.83 |
| Absolute magnitude | magnitude 7.91 |
| Spectral type | K5V |
| Surface temperature | 4,470 K |
| Luminosity | 0.109 L☉ |
| Radius | 0.552 R☉ |
| Mass | 0.575 M☉ (estimated) |
| Right ascension (J2000) | 20h 41m 42.2s |
| Declination (J2000) | −22° 19′ 21″ |
| Space velocity (relative to the Sun) | 114.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.83. Visible from the whole Southern Hemisphere and north to latitude 68° N. South of latitude 68° 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 1947. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
The Sun seen from there
From a planet around GJ 1257, the Sun would look like a star of magnitude 6.75, 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):
- HIP 102332 6.16 light-years
- CFBDS J204803.61-183212.7 6.27 light-years
- Gl 799.1 8.45 light-years
- WISEA J205202.06-204313.0 10.1 light-years
- GJ 4162 10.4 light-years
- CWISEP J210007.87-293139.8 11.8 light-years
- PSO J318.5338-22.8603 11.8 light-years
- Gl 811 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.