Star · M3
GJ 3145
GJ 3145 is a main-sequence star of spectral type M3 in the constellation Cetus, 89.2 light-years from the Sun.
| Constellation | Cetus |
|---|---|
| Distance | 89.2 light-years (27.3 pc) |
| Apparent magnitude | magnitude 13.00 |
| Absolute magnitude | magnitude 10.82 |
| Spectral type | M3 |
| Surface temperature | 3,790 K |
| Luminosity | 0.0148 L☉ |
| Radius | 0.282 R☉ |
| Mass | 0.304 M☉ (estimated) |
| Right ascension (J2000) | 2h 15m 48.9s |
| Declination (J2000) | −12° 40′ 22″ |
| Space velocity (relative to the Sun) | 70.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.00. 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 October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1937. 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 3145, the Sun would look like a star of magnitude 7.01, in the direction where our sky has the constellation Boötes. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3133 6.76 light-years
- HIP 11759 7.33 light-years
- GJ 3138 7.36 light-years
- WISEA J022609.16-161000.4 7.86 light-years
- GJ 3127 9.05 light-years
- HIP 11029 9.05 light-years
- GJ 3155 9.44 light-years
- DENIS J0230450-095305 10.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.