Star · M1
GJ 4187A
GJ 4187A is a main-sequence star of spectral type M1 in the constellation Aquarius, 87.8 light-years from the Sun.
| Constellation | Aquarius |
|---|---|
| Distance | 87.8 light-years (26.9 pc) |
| Apparent magnitude | magnitude 12.11 |
| Absolute magnitude | magnitude 9.96 |
| Spectral type | M1 |
| Surface temperature | 3,760 K |
| Luminosity | 0.034 L☉ |
| Radius | 0.434 R☉ |
| Mass | 0.429 M☉ (estimated) |
| Right ascension (J2000) | 21h 17m 37.3s |
| Declination (J2000) | −8° 54′ 31″ |
| Space velocity (relative to the Sun) | 10.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.11. Visible from the whole Southern Hemisphere and north to latitude 81° N. 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 1938. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.6 million years.
The Sun seen from there
From a planet around GJ 4187A, the Sun would look like a star of magnitude 6.98, 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):
- 2MASSW J2130446-084520 5.01 light-years
- 11 Aqr 9.14 light-years
- GJ 9721B 9.79 light-years
- GJ 9721A 9.79 light-years
- GJ 4188B 10.1 light-years
- 2MASS J21324898-1452544 10.8 light-years
- GJ 4217 12.9 light-years
- 2MASS J21542494-1023022 14.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.