HD 22781
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 40m 49.5246s |
| Declination | +31° 49′ 34.6489″ |
| Apparent magnitude (V) | 8.78 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | K0 |
| Astrometry | |
| Radial velocity (Rv) | 8.26 km/s |
| Proper motion (μ) | RA: 40.576 mas/yr Dec.: −94.254 mas/yr |
| Parallax (π) | 30.6433±0.1071 mas |
| Distance | 106.4 ± 0.4 ly (32.6 ± 0.1 pc) |
| Details | |
| Mass | 0.75±0.02 M☉ |
| Radius | 0.70±0.02 R☉ |
| Surface gravity (log g) | 4.57±0.04 cgs |
| Temperature | 5175±15 K |
| Metallicity [Fe/H] | −0.35±0.02 dex |
| Rotational velocity (v sin i) | 1.73 km/s |
| Age | 4.14±3.63 Gyr |
| Other designations | |
| BD+31 630, Gaia DR2 217334764042444288, HD 22781, HIP 17187, TYC 2355-246-1, GSC 02355-00246, 2MASS J03404953+3149345 | |
| Database references | |
| SIMBAD | data |
HD 22781, is a single star about 106 light-years away. It is a K-type main-sequence star. The star’s age is poorly constrained at 4.14±3.63 billion years, but is likely similar to that of the Sun. HD 22781 is heavily depleted in heavy elements, having just 45% of Sun's concentration of iron, yet is comparatively rich in carbon, having 90% of Sun`s abundance.
An imaging survey in 2012 has failed to find any stellar companions, suggesting HD 22781 is a single star.