Star · B7III
HIP 21428
HIP 21428 is a giant star of spectral type B7III in the constellation Eridanus, 1,038 light-years from the Sun.
| Constellation | Eridanus |
|---|---|
| Distance | 1,038 light-years (318.2 pc) |
| Apparent magnitude | magnitude 6.34 |
| Absolute magnitude | magnitude −1.17 |
| Spectral type | B7III |
| Surface temperature | 11,570 K |
| Luminosity | 448 L☉ |
| Radius | 5.27 R☉ |
| Mass | 5.2 M☉ (estimated) |
| Right ascension (J2000) | 4h 36m 01.7s |
| Declination (J2000) | −3° 36′ 42″ |
| Space velocity (relative to the Sun) | 28.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.34). Visible from the whole Southern Hemisphere and north to latitude 86° N. 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 988. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 18 million years.
The Sun seen from there
From a planet around HIP 21428, the Sun would look like a star of magnitude 12.34, in the direction where our sky has the constellation Ophiuchus. 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.