Star · A
HIP 20842
HIP 20842 is a main-sequence star of spectral type A in the constellation Taurus, 161.8 light-years from the Sun.
| Constellation | Taurus |
|---|---|
| Distance | 161.8 light-years (49.6 pc) |
| Apparent magnitude | magnitude 5.72 |
| Absolute magnitude | magnitude 2.24 |
| Spectral type | A |
| Surface temperature | 7,660 K |
| Luminosity | 11.1 L☉ |
| Radius | 1.89 R☉ |
| Mass | 1.83 M☉ (estimated) |
| Right ascension (J2000) | 4h 28m 00.8s |
| Declination (J2000) | +21° 37′ 12″ |
| Space velocity (relative to the Sun) | 48.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.72). Visible from the whole Northern Hemisphere and south to latitude 68° S. North of latitude 68° N 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 1864. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.9 million years.
The Sun seen from there
From a planet around HIP 20842, the Sun would look like a star of magnitude 8.31, in the direction where our sky has the constellation Ophiuchus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.