Star · K7V
Gl 638
Gl 638 is a main-sequence star of spectral type K7V in the constellation Hercules, 32.1 light-years from the Sun.
| Other names | HIP 82003 |
|---|---|
| Constellation | Hercules |
| Distance | 32.1 light-years (9.85 pc) |
| Apparent magnitude | magnitude 8.10 |
| Absolute magnitude | magnitude 8.13 |
| Spectral type | K7V |
| Surface temperature | 4,100 K |
| Luminosity | 0.122 L☉ |
| Radius | 0.692 R☉ |
| Mass | 0.591 M☉ (estimated) |
| Right ascension (J2000) | 16h 45m 06.3s |
| Declination (J2000) | +33° 30′ 32″ |
| Space velocity (relative to the Sun) | 36.7 km/s |
In the sky
Too faint for the naked eye (magnitude 8.10); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° N it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1994. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 570 thousand years.
The Sun seen from there
From a planet around Gl 638, the Sun would look like a star of magnitude 4.80, in the direction where our sky has the constellation Caelum. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.