Star · G2V
Gl 644B
Gl 644B is a main-sequence star of spectral type G2V in the constellation Ophiuchus, 18.7 light-years from the Sun.
| Constellation | Ophiuchus |
|---|---|
| Distance | 18.7 light-years (5.74 pc) |
| Apparent magnitude | magnitude 9.90 |
| Absolute magnitude | magnitude 11.11 |
| Spectral type | G2V |
| Surface temperature | 5,780 K |
| Luminosity | 0.00335 L☉ |
| Radius | 0.0578 R☉ |
| Mass | 0.159 M☉ (estimated) |
| Right ascension (J2000) | 16h 55m 28.2s |
| Declination (J2000) | −8° 20′ 15″ |
| Space velocity (relative to the Sun) | 35.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.90. Visible from the whole Southern Hemisphere and north to latitude 82° N. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 2007. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 332 thousand years.
The Sun seen from there
From a planet around Gl 644B, the Sun would look like a star of magnitude 3.62, in the direction where our sky has the constellation Orion. 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.