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 |
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]
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 | — | — |
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 |
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]
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 | — | — |