Star · K0
GJ 3638
GJ 3638 is a giant star of spectral type K0 in the constellation Leo, 681.6 light-years from the Sun.
| Other names | HIP 53881 |
|---|---|
| Constellation | Leo |
| Distance | 681.6 light-years (209.0 pc) |
| Apparent magnitude | magnitude 7.64 |
| Absolute magnitude | magnitude 1.04 |
| Spectral type | K0 |
| Surface temperature | 4,900 K |
| Luminosity | 47.2 L☉ |
| Radius | 9.52 R☉ |
| Mass | 2.73 M☉ (estimated) |
| Right ascension (J2000) | 11h 01m 25.8s |
| Declination (J2000) | +15° 00′ 35″ |
| Space velocity (relative to the Sun) | 321.6 km/s |
In the sky
Too faint for the naked eye (magnitude 7.64); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 75° S. North of latitude 75° N 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 1344. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 12 million years.
The Sun seen from there
From a planet around GJ 3638, the Sun would look like a star of magnitude 11.43, in the direction where our sky has the constellation Aquarius. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.