HAT-P-20
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 07h 27m 39.9489s |
| Declination | +24° 20′ 11.516″ |
| Apparent magnitude (V) | 11.35 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | K3V |
| Astrometry | |
| Radial velocity (Rv) | -18.559 km/s |
| Proper motion (μ) | RA: −5.104(18) mas/yr Dec.: −96.090(16) mas/yr |
| Parallax (π) | 14.0065±0.0176 mas |
| Distance | 232.9 ± 0.3 ly (71.40 ± 0.09 pc) |
| Details | |
| Mass | 0.798±0.018 M☉ |
| Radius | 0.744±0.011 R☉ |
| Luminosity | 0.19 L☉ |
| Surface gravity (log g) | 4.52±0.09 cgs |
| Temperature | 4595±45 K |
| Metallicity | 0.22±0.09 |
| Rotation | 14.66±0.03 d |
| Rotational velocity (v sin i) | 2.0±0.5 km/s |
| Age | 334 Myr |
| Other designations | |
| Gaia DR2 869913435026514688, 2MASS J07273995+2420118 | |
| Database references | |
| SIMBAD | data |
HAT-P-20 is a K-type main-sequence star about 233 light-years away. The star has a strong starspot activity, and its equatorial plane is misaligned by 36+10
−12° with the planetary orbit. Although star with a giant planet on close orbit is expected to be spun-up by tidal forces, only weak indications of tidal spin-up were detected.