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Star in the constellation Perseus From Wikipedia, the free encyclopedia
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.[5] HD 22781 is heavily depleted in heavy elements, having just 45% of Sun's concentration of iron,[2] yet is comparatively rich in carbon, having 90% of Sun`s abundance.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 03h 40m 49.5246s[1] |
Declination | +31° 49′ 34.6489″[1] |
Apparent magnitude (V) | 8.78[2] |
Characteristics | |
Evolutionary stage | main-sequence star[3] |
Spectral type | K0[2] |
Astrometry | |
Radial velocity (Rv) | 8.26[1] km/s |
Proper motion (μ) | RA: 40.576[1] mas/yr Dec.: −94.254[1] mas/yr |
Parallax (π) | 30.6433 ± 0.1071 mas[4] |
Distance | 106.4 ± 0.4 ly (32.6 ± 0.1 pc) |
Details[5] | |
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[3] km/s |
Age | 4.14±3.63 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
An imaging survey in 2012 has failed to find any stellar companions, suggesting HD 22781 is a single star.[6]
In 2011 a transiting superjovian planet or brown dwarf b was detected on an extremely eccentric orbit.[3] It is located just outside of the conservative habitable zone of the parent star.[7] Planets around such metal-poor stars are rare; the only three known similar cases are HD 111232 and HD 181720.[8]
In 2012, a radial velocity data review indicated there are no additional giant planets in the system.[9]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥13.65±0.97 MJ | 1.167±0.039 | 528.07±0.14 | 0.8191±0.0023 | — | — |
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