Star · M3
GJ 4170
GJ 4170 is a main-sequence star of spectral type M3 in the constellation Cepheus, 71.5 light-years from the Sun.
| Constellation | Cepheus |
|---|---|
| Distance | 71.5 light-years (21.9 pc) |
| Apparent magnitude | magnitude 11.70 |
| Absolute magnitude | magnitude 9.99 |
| Spectral type | M3 |
| Surface temperature | 3,730 K |
| Luminosity | 0.0343 L☉ |
| Radius | 0.442 R☉ |
| Mass | 0.43 M☉ (estimated) |
| Right ascension (J2000) | 20h 51m 59.0s |
| Declination (J2000) | +69° 10′ 07″ |
| Space velocity (relative to the Sun) | 24.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.70. Visible from the whole Northern Hemisphere and south to latitude 21° S. North of latitude 21° N it never sets. 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 1954. 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 4170, the Sun would look like a star of magnitude 6.54, in the direction where our sky has the constellation Volans. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- CWISE J201221.32+701740.2 4.90 light-years
- HIP 102300 6.31 light-years
- Gl 828.5 6.68 light-years
- GJ 4120 8.56 light-years
- CWISE J193823.28+663602.7 9.19 light-years
- TOI-6324 9.32 light-years
- GJ 1266 9.83 light-years
- Gl 842.2 10.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.