Star · K0
HIP 20039
HIP 20039 is a supergiant star of spectral type K0 in the constellation Cepheus, 747.9 light-years from the Sun.
| Constellation | Cepheus |
|---|---|
| Distance | 747.9 light-years (229.3 pc) |
| Apparent magnitude | magnitude 6.39 |
| Absolute magnitude | magnitude −0.41 |
| Spectral type | K0 |
| Surface temperature | 4,870 K |
| Luminosity | 183 L☉ |
| Radius | 19 R☉ |
| Mass | 4.02 M☉ (estimated) |
| Right ascension (J2000) | 4h 17m 51.8s |
| Declination (J2000) | +80° 32′ 09″ |
| Space velocity (relative to the Sun) | 22.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.39). Visible from the whole Northern Hemisphere and south to latitude 9° S. North of latitude 9° N it never sets.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1278. 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 20039, the Sun would look like a star of magnitude 11.63, in the direction where our sky has the constellation Apus. 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.