HAT-P-17
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 38m 08.7310s |
| Declination | +30° 29′ 19.446″ |
| Apparent magnitude (V) | 10.38 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | early K |
| Astrometry | |
| Proper motion (μ) | RA: −80.280(16) mas/yr Dec.: −127.037(15) mas/yr |
| Parallax (π) | 10.8195±0.0182 mas |
| Distance | 301.5 ± 0.5 ly (92.4 ± 0.2 pc) |
| Absolute magnitude (MV) | +5.75 |
| Details | |
| Mass | 0.857±0.039 M☉ |
| Radius | 0.837 R☉ |
| Luminosity | 0.48±0.04 L☉ |
| Surface gravity (log g) | 4.53±0.02 cgs |
| Temperature | 5345±70 K |
| Metallicity | 0.06±0.08 |
| Rotational velocity (v sin i) | 0.56+0.12 −0.14 km/s |
| Age | 7.8±3.3 Gyr |
| Other designations | |
| TYC 2717-417-1, GSC 02717-00417, 2MASS J21380873+3029193 | |
| Database references | |
| SIMBAD | data |
HAT-P-17 is a K-type main-sequence star about 92.4 parsecs (301 ly) away. It has a mass of about 0.857 ± 0.039 M☉. It is the host of two planets, HAT-P-17b and HAT-P-17c, both discovered in 2010. A search for a binary companion star using adaptive optics at the MMT Observatory was negative. A candidate companion was detected by a spectroscopic search of high-resolution K band infrared spectra taken at the Keck observatory.