Star · K1
HD 22781
HD 22781 is a main-sequence star of spectral type K1 in the constellation Perseus, 106.2 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 17187 |
|---|---|
| Constellation | Perseus |
| Distance | 106.2 light-years (32.6 pc) |
| Apparent magnitude | magnitude 8.78 |
| Absolute magnitude | magnitude 6.22 |
| Spectral type | K1 |
| Surface temperature | 5,030 K |
| Luminosity | 0.335 L☉ |
| Radius | 0.743 R☉ |
| Mass | 0.75 M☉ |
| Age | 4.8 billion years |
| Metallicity [Fe/H] | -0.37 |
| Right ascension (J2000) | 3h 40m 49.5s |
| Declination (J2000) | +31° 49′ 34″ |
| Space velocity (relative to the Sun) | 18.0 km/s |
In the sky
Too faint for the naked eye (magnitude 8.78); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 58° S. North of latitude 58° 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 1920. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.9 million years.
The Sun seen from there
From a planet around HD 22781, the Sun would look like a star of magnitude 7.39, in the direction where our sky has the constellation Lupus. It would be invisible to the naked eye.
Planets
- HD 22781 b 528-day orbit · 12.3 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3234 8.45 light-years
- HIP 18965 10.4 light-years
- GJ 3219A 11.5 light-years
- HIP 16090 12.0 light-years
- TOI-1634 13.2 light-years
- HIP 15466 14.5 light-years
- 2MASS J03302948+3910242 15.2 light-years
- HIP 18090 15.3 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.