Star · A
HIP 22157
HIP 22157 is a main-sequence star of spectral type A in the constellation Orion, 211.5 light-years from the Sun.
| Constellation | Orion |
|---|---|
| Distance | 211.5 light-years (64.8 pc) |
| Apparent magnitude | magnitude 5.35 |
| Absolute magnitude | magnitude 1.29 |
| Spectral type | A |
| Surface temperature | 8,190 K |
| Luminosity | 28 L☉ |
| Radius | 2.63 R☉ |
| Mass | 2.35 M☉ (estimated) |
| Right ascension (J2000) | 4h 46m 01.7s |
| Declination (J2000) | +11° 42′ 20″ |
| Space velocity (relative to the Sun) | 45.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.35). Visible from the whole Northern Hemisphere and south to latitude 78° S. North of latitude 78° 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 1815. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.8 million years.
The Sun seen from there
From a planet around HIP 22157, the Sun would look like a star of magnitude 8.89, 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):
- HIP 21672 12.2 light-years
- π² Ori 13.5 light-years
- HIP 22458 17.3 light-years
- HIP 22566 18.4 light-years
- HIP 21475 18.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.