Kepler-17
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 53m 34.8643s[1]
Declination +47° 48′ 54.050″[1]
Apparent magnitude (V) 14.0[2]
Astrometry
Proper motion (μ) RA: −3.778±0.032[1] mas/yr
Dec.: −6.365±0.035[1] mas/yr
Parallax (π)1.3589 ± 0.0198 mas[1]
Distance2,400 ± 30 ly
(740 ± 10 pc)
Characteristics
Spectral type G2V[2]
Details[2]
Mass1.16±0.06 M☉
Radius1.05±0.03 R☉
Temperature5781±85 K
Metallicity [Fe/H]0.26 (± 0.1) dex
Rotation12.159±0.029 days[3]
Rotational velocity (v sin i)4.2±0.5[4] km/s
Age3.0±1.6[5] Gyr
Other designations
Gaia DR2 2086449761846310784, KOI-203, KIC 10619192, 2MASS J19533486+4748540[4]
Database references
SIMBADdata
KICdata

Kepler-17 is a main-sequence yellow dwarf star that is much more active than the Sun with starspots covering roughly 6% of its surface.[6] Starspots are long-lived, with at least one persisting for 1400 days.[7]

Planetary system

The Kepler-17 is known to host one superjovian exoplanet, Kepler-17b, in orbit around it. It was discovered by the transit method in 2011.[8]

The Kepler-17 planetary system[8][9]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 2.45±0.014 MJ 0.02591±0.00037 1.4857108±2e-07 <0.011 87.2±0.15° 1.312±0.018 RJ

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c "Notes on Kepler-17 b". Extrasolar Planets Encyclopaedia. Retrieved 15 January 2017.
  3. ^ McQuillan, A.; Mazeh, T.; Aigrain, S. (2013). "Stellar Rotation Periods of The Kepler objects of Interest: A Dearth of Close-In Planets Around Fast Rotators". The Astrophysical Journal Letters. 775 (1). L11. arXiv:1308.1845. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11.
  4. ^ a b "Kepler-17". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 January 2017.
  5. ^ Morris, Brett M.; Agol, Eric; Hebb, Leslie; Hawley, Suzanne L. (2018), "Robust Transiting Exoplanet Radii in the Presence of Starspots from Ingress and Egress Durations", The Astronomical Journal, 156 (3): 91, arXiv:1807.04886, Bibcode:2018AJ....156...91M, doi:10.3847/1538-3881/aad3b7, S2CID 119420137
  6. ^ Valio, Adriana; et al. (2017). "Activity and Rotation of Kepler-17". The Astrophysical Journal. 835 (2). 294. arXiv:1702.02213. Bibcode:2017ApJ...835..294V. doi:10.3847/1538-4357/835/2/294.
  7. ^ Lanza, A. F.; Netto, Y.; Bonomo, A. S.; Parviainen, H.; Valio, A.; Aigrain, S. (2019), "Stellar activity and rotation of the planet host Kepler-17 from long-term space-borne photometry", Astronomy & Astrophysics, 626: A38, arXiv:1904.04489, Bibcode:2019A&A...626A..38L, doi:10.1051/0004-6361/201833894, S2CID 104292264
  8. ^ a b Désert, Jean-Michel; et al. (2011). "The Hot-Jupiter Kepler-17b: Discovery, Obliquity from Stroboscopic Starspots, and Atmospheric Characterization". The Astrophysical Journal Supplement Series. 197 (1). 14. arXiv:1107.5750. Bibcode:2011ApJS..197...14D. doi:10.1088/0067-0049/197/1/14.
  9. ^ Planet Kepler-17 b on exoplanet.eu


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