Star · K0II
HIP 21042
HIP 21042 is a bright giant star of spectral type K0II in the constellation Eridanus, 377.5 light-years from the Sun.
| Constellation | Eridanus |
|---|---|
| Distance | 377.5 light-years (115.7 pc) |
| Apparent magnitude | magnitude 5.95 |
| Absolute magnitude | magnitude 0.63 |
| Spectral type | K0II |
| Surface temperature | 4,730 K |
| Luminosity | 75.3 L☉ |
| Radius | 12.9 R☉ |
| Mass | 3.12 M☉ (estimated) |
| Right ascension (J2000) | 4h 30m 40.3s |
| Declination (J2000) | −35° 39′ 13″ |
| Space velocity (relative to the Sun) | 20.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.95). Visible from the whole Southern Hemisphere and north to latitude 54° N. South of latitude 54° 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 1648. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.7 million years.
The Sun seen from there
From a planet around HIP 21042, the Sun would look like a star of magnitude 10.15, 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.