Star · K3V
GJ 3581
GJ 3581 is a main-sequence star of spectral type K3V in the constellation Hydra, 82.1 light-years from the Sun.
| Other names | HIP 49127 |
|---|---|
| Constellation | Hydra |
| Distance | 82.1 light-years (25.2 pc) |
| Apparent magnitude | magnitude 8.65 |
| Absolute magnitude | magnitude 6.65 |
| Spectral type | K3V |
| Surface temperature | 4,700 K |
| Luminosity | 0.301 L☉ |
| Radius | 0.826 R☉ |
| Mass | 0.741 M☉ (estimated) |
| Right ascension (J2000) | 10h 01m 37.3s |
| Declination (J2000) | −15° 25′ 30″ |
| Space velocity (relative to the Sun) | 35.7 km/s |
In the sky
Too faint for the naked eye (magnitude 8.65); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 75° N. South of latitude 75° S it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1944. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.5 million years.
The Sun seen from there
From a planet around GJ 3581, the Sun would look like a star of magnitude 6.83, in the direction where our sky has the constellation Pegasus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- DENIS J1004403-131818 3.49 light-years
- 2MASS J09490860-1545485 6.38 light-years
- HIP 49366 8.07 light-years
- CWISE J095316.32-094318.9 9.29 light-years
- HIP 49809 9.76 light-years
- HIP 50696 9.78 light-years
- CWISE J094925.88-102601.9 10.5 light-years
- LTT 3780 12.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.