Star · M0
GJ 3842
GJ 3842 is a main-sequence star of spectral type M0 in the constellation Boötes, 117.4 light-years from the Sun.
| Constellation | Boötes |
|---|---|
| Distance | 117.4 light-years (36.0 pc) |
| Apparent magnitude | magnitude 12.31 |
| Absolute magnitude | magnitude 9.53 |
| Spectral type | M0 |
| Surface temperature | 3,780 K |
| Luminosity | 0.0496 L☉ |
| Radius | 0.52 R☉ |
| Mass | 0.472 M☉ (estimated) |
| Right ascension (J2000) | 14h 20m 02.7s |
| Declination (J2000) | +39° 02′ 13″ |
| Space velocity (relative to the Sun) | 12.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.31. Visible from the whole Northern Hemisphere and south to latitude 51° S. North of latitude 51° N it never sets. It stands highest at midnight in April, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1909. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.1 million years.
The Sun seen from there
From a planet around GJ 3842, the Sun would look like a star of magnitude 7.61, in the direction where our sky has the constellation Fornax. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 70836 7.06 light-years
- HIP 69311 9.19 light-years
- HIP 68745 9.50 light-years
- HIP 70142 10.1 light-years
- SDSS J145057.34+392045.2 12.3 light-years
- HIP 69963 14.1 light-years
- HIP 70500 14.6 light-years
- HIP 71193 14.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.