Star · G2V
Gl 646B
Gl 646B is a main-sequence star of spectral type G2V in the constellation Scorpius, 61.7 light-years from the Sun.
| Constellation | Scorpius |
|---|---|
| Distance | 61.7 light-years (18.9 pc) |
| Apparent magnitude | magnitude 10.40 |
| Absolute magnitude | magnitude 9.02 |
| Spectral type | G2V |
| Surface temperature | 5,780 K |
| Luminosity | 0.023 L☉ |
| Radius | 0.151 R☉ |
| Mass | 0.367 M☉ (estimated) |
| Right ascension (J2000) | 16h 58m 53.9s |
| Declination (J2000) | −39° 33′ 29″ |
| Space velocity (relative to the Sun) | 31.5 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.40. Visible from the whole Southern Hemisphere and north to latitude 50° N. South of latitude 50° S it never sets. 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 1964. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.1 million years.
The Sun seen from there
From a planet around Gl 646B, the Sun would look like a star of magnitude 6.21, in the direction where our sky has the constellation Auriga. 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.