Star · M3III
47 Cap
47 Cap is a giant star of spectral type M3III in the constellation Capricornus, 939.9 light-years from the Sun.
| Other names | HIP 107487 |
|---|---|
| Constellation | Capricornus |
| Distance | 939.9 light-years (288.2 pc) |
| Apparent magnitude | magnitude 6.00 |
| Absolute magnitude | magnitude −1.30 |
| Spectral type | M3III |
| Surface temperature | 3,610 K |
| Luminosity | 1,360 L☉ |
| Radius | 94.2 R☉ |
| Mass | 7.13 M☉ (estimated) |
| Right ascension (J2000) | 21h 46m 16.3s |
| Declination (J2000) | −9° 16′ 33″ |
| Space velocity (relative to the Sun) | 33.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.00). Visible from the whole Southern Hemisphere and north to latitude 81° N. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1086. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 17 million years.
The Sun seen from there
From a planet around 47 Cap, the Sun would look like a star of magnitude 12.13, in the direction where our sky has the constellation Leo. 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.