Star · M1
GJ 4220
GJ 4220 is a main-sequence star of spectral type M1 in the constellation Pegasus, 101.9 light-years from the Sun.
| Constellation | Pegasus |
|---|---|
| Distance | 101.9 light-years (31.2 pc) |
| Apparent magnitude | magnitude 11.79 |
| Absolute magnitude | magnitude 9.32 |
| Spectral type | M1 |
| Surface temperature | 3,900 K |
| Luminosity | 0.0515 L☉ |
| Radius | 0.496 R☉ |
| Mass | 0.476 M☉ (estimated) |
| Right ascension (J2000) | 21h 47m 57.1s |
| Declination (J2000) | +5° 49′ 23″ |
| Space velocity (relative to the Sun) | 67.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.79. Visible from the whole Northern Hemisphere and south to latitude 84° S. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1924. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.8 million years.
The Sun seen from there
From a planet around GJ 4220, the Sun would look like a star of magnitude 7.30, in the direction where our sky has the constellation Sextans. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 107948 3.06 light-years
- HIP 107941 7.34 light-years
- PSO J329.8288+03.0840 7.96 light-years
- HIP 107062 10.4 light-years
- GJ 4221 10.4 light-years
- HIP 109480 11.4 light-years
- SIMP J21570693-0130348 13.6 light-years
- Gl 828.1 14.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.