HAT-P-17

HAT-P-17
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]
Distance301.5 ± 0.5 ly
(92.4 ± 0.2 pc)
Details
Mass0.857±0.039 M☉
Radius0.837 R☉
Luminosity0.48±0.04 L☉
Surface gravity (log g)4.53±0.02[5] cgs
Temperature5345±70[5] K
Metallicity0.06±0.08[5]
Rotational velocity (v sin i)0.56+0.12
−0.14[6] km/s
Age7.8±3.3 Gyr
Other designations
TYC 2717-417-1, GSC 02717-00417, 2MASS J21380873+3029193[7]
Database references
SIMBADdata
Comparison of the exoplanet HAT-P-17 b with the planet Jupiter

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]

  1. ^ Cite error: The named reference Roman1987 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  3. ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  4. ^ a b Cite error: The named reference Howard2012 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Torres2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Fulton2013 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  8. ^ "Open Exoplanet Catalogue - HAT-P-17 b". www.openexoplanetcatalogue.com. Retrieved 2020-01-10.
  9. ^ Cite error: The named reference Adams2013 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Piskorz2015 was invoked but never defined (see the help page).