Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus[1] |
Right ascension | 21h 38m 08.7310s[2] |
Declination | +30° 29′ 19.446″[2] |
Apparent magnitude (V) | 10.38[3] |
Characteristics | |
Spectral type | early K[4] |
Astrometry | |
Proper motion (μ) | RA: −80.280(16) mas/yr[2] Dec.: −127.037(15) mas/yr[2] |
Parallax (π) | 10.8195 ± 0.0182 mas[2] |
Distance | 301.5 ± 0.5 ly (92.4 ± 0.2 pc) |
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[5] cgs |
Temperature | 5345±70[5] K |
Metallicity | 0.06±0.08[5] |
Rotational velocity (v sin i) | 0.56+0.12 −0.14[6] km/s |
Age | 7.8±3.3 Gyr |
Other designations | |
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.[4][8] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.[9] A candidate companion was detected by a spectroscopic search of high-resolution K band infrared spectra taken at the Keck observatory.[10]
Roman1987
was invoked but never defined (see the help page).Gaia DR3
was invoked but never defined (see the help page).Howard2012
was invoked but never defined (see the help page).Torres2012
was invoked but never defined (see the help page).Fulton2013
was invoked but never defined (see the help page).Simbad
was invoked but never defined (see the help page).Adams2013
was invoked but never defined (see the help page).Piskorz2015
was invoked but never defined (see the help page).