Star · M1III
HIP 20856
HIP 20856 is a giant star of spectral type M1III in the constellation Caelum, 1,337 light-years from the Sun.
| Constellation | Caelum |
|---|---|
| Distance | 1,337 light-years (409.8 pc) |
| Apparent magnitude | magnitude 6.41 |
| Absolute magnitude | magnitude −1.65 |
| Spectral type | M1III |
| Surface temperature | 3,630 K |
| Luminosity | 1,820 L☉ |
| Radius | 108 R☉ |
| Mass | 7.76 M☉ (estimated) |
| Right ascension (J2000) | 4h 28m 09.5s |
| Declination (J2000) | −41° 57′ 35″ |
| Space velocity (relative to the Sun) | 102.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.41). Visible from the whole Southern Hemisphere and north to latitude 48° N. South of latitude 48° 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 689. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 24 million years.
The Sun seen from there
From a planet around HIP 20856, the Sun would look like a star of magnitude 12.89, in the direction where our sky has the constellation Hercules. 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.