HAT-P-23
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 24m 29.7235s |
| Declination | +16° 45′ 43.812″ |
| Apparent magnitude (V) | 11.94 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G0 |
| Apparent magnitude (J) | 11.103±0.022 |
| Apparent magnitude (H) | 10.846±0.022 |
| Apparent magnitude (K) | 10.791±0.020 |
| Variable type | Planetary transit |
| Astrometry | |
| Radial velocity (Rv) | −16.67±0.88 km/s |
| Proper motion (μ) | RA: 13.325(11) mas/yr Dec.: −5.505(11) mas/yr |
| Parallax (π) | 2.7358±0.0108 mas |
| Distance | 1,192 ± 5 ly (366 ± 1 pc) |
| Details | |
| Mass | 1.13±0.035 M☉ |
| Radius | 1.203±0.074 R☉ |
| Luminosity | 1.58±0.23 L☉ |
| Surface gravity (log g) | 4.33±0.05 cgs |
| Temperature | 5905±80 K |
| Metallicity | 0.15±0.04 |
| Rotation | 7.015 d |
| Rotational velocity (v sin i) | 8.1±0.5 km/s |
| Age | 4.0±1.0 Gyr |
| Other designations | |
| Moriah, TYC 1632-1396-1, GSC 01632-01396, 2MASS J20242972+1645437 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HAT-P-23 is a G-type main-sequence star 1192 light-years away. It has a rapid rotation (rotation period equal to 7 days) for its advanced age of 4 billion years, and exhibits a strong starspot activity. The star may be in the process of being spun up by the giant planet on close orbit. The star is enriched in heavy elements, having about 140% amount of metals compared to solar abundance.