Star · G5
GJ 3687
GJ 3687 is a giant star of spectral type G5 in the constellation Hydra, 248.8 light-years from the Sun.
| Other names | HIP 57574 |
|---|---|
| Constellation | Hydra |
| Distance | 248.8 light-years (76.3 pc) |
| Apparent magnitude | magnitude 7.10 |
| Absolute magnitude | magnitude 2.69 |
| Spectral type | G5 |
| Surface temperature | 5,420 K |
| Luminosity | 8.5 L☉ |
| Radius | 3.31 R☉ |
| Mass | 1.71 M☉ (estimated) |
| Right ascension (J2000) | 11h 48m 03.9s |
| Declination (J2000) | −35° 13′ 31″ |
| Space velocity (relative to the Sun) | 62.0 km/s |
In the sky
Too faint for the naked eye (magnitude 7.10); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 55° N. South of latitude 55° S it never sets. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1777. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.4 million years.
The Sun seen from there
From a planet around GJ 3687, the Sun would look like a star of magnitude 9.24, in the direction where our sky has the constellation Andromeda. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 57207 5.91 light-years
- HIP 57589 9.83 light-years
- HIP 56621 11.3 light-years
- HIP 57672 12.3 light-years
- HIP 56532 15.0 light-years
- HIP 57344 18.7 light-years
- HIP 56876 19.3 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.