Star · M3
HIP 66645
HIP 66645 is a supergiant star of spectral type M3 in the constellation Centaurus, 1,115 light-years from the Sun.
| Constellation | Centaurus |
|---|---|
| Distance | 1,115 light-years (341.8 pc) |
| Apparent magnitude | magnitude 6.29 |
| Absolute magnitude | magnitude −1.38 |
| Spectral type | M3 |
| Surface temperature | 3,650 K |
| Luminosity | 1,370 L☉ |
| Radius | 92.3 R☉ |
| Mass | 7.15 M☉ (estimated) |
| Right ascension (J2000) | 13h 39m 40.8s |
| Declination (J2000) | −39° 44′ 51″ |
| Space velocity (relative to the Sun) | 55.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.29). 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 April, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 911. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 20 million years.
The Sun seen from there
From a planet around HIP 66645, the Sun would look like a star of magnitude 12.50, in the direction where our sky has the constellation Andromeda. 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.