Star · K2III
HIP 21666
HIP 21666 is a giant star of spectral type K2III in the constellation Pictor, 741.0 light-years from the Sun.
| Constellation | Pictor |
|---|---|
| Distance | 741.0 light-years (227.2 pc) |
| Apparent magnitude | magnitude 6.45 |
| Absolute magnitude | magnitude −0.33 |
| Spectral type | K2III |
| Surface temperature | 4,080 K |
| Luminosity | 304 L☉ |
| Radius | 34.8 R☉ |
| Mass | 4.65 M☉ (estimated) |
| Right ascension (J2000) | 4h 39m 04.3s |
| Declination (J2000) | −51° 40′ 22″ |
| Space velocity (relative to the Sun) | 43.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.45). Visible from the whole Southern Hemisphere and north to latitude 38° N. South of latitude 38° S it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1285. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
The Sun seen from there
From a planet around HIP 21666, the Sun would look like a star of magnitude 11.61, in the direction where our sky has the constellation Draco. 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.