HAT-P-23
HAT-P-23 is a G-type main-sequence star about 1200 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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 24m 29.7235s |
| Declination | +16° 45′ 43.8103″ |
| Apparent magnitude (V) | 11.94 |
| Characteristics | |
| Spectral type | G0V |
| 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) | -14.324 km/s |
| Proper motion (μ) | RA: 13.263±0.050 mas/yr Dec.: −5.412±0.049 mas/yr |
| Parallax (π) | 2.7129 ± 0.0351 mas |
| Distance | 1,200 ± 20 ly (369 ± 5 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 | |
| Database references | |
| SIMBAD | data |
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