Star · M4
GJ 4378A
GJ 4378A is a main-sequence star of spectral type M4 in the constellation Cetus, 64.7 light-years from the Sun.
| Constellation | Cetus |
|---|---|
| Distance | 64.7 light-years (19.8 pc) |
| Apparent magnitude | magnitude 12.93 |
| Absolute magnitude | magnitude 11.44 |
| Spectral type | M4 |
| Surface temperature | 3,820 K |
| Luminosity | 0.008 L☉ |
| Radius | 0.204 R☉ |
| Mass | 0.232 M☉ (estimated) |
| Right ascension (J2000) | 23h 57m 20.6s |
| Declination (J2000) | −12° 58′ 47″ |
| Space velocity (relative to the Sun) | 19.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.93. Visible from the whole Southern Hemisphere and north to latitude 77° N. South of latitude 77° S it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1961. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.1 million years.
The Sun seen from there
From a planet around GJ 4378A, the Sun would look like a star of magnitude 6.32, in the direction where our sky has the constellation Leo. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- 6 Cet 5.55 light-years
- GJ 3016 6.12 light-years
- GJ 4379B 6.44 light-years
- TOI-260 7.08 light-years
- WISEPC J234026.62-074507.2 8.34 light-years
- GJ 4355 8.53 light-years
- 9 Cet 8.83 light-years
- WISEPC J234841.10-102844.4 9.25 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.