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] |
| Distance | 2,400 ± 30 ly (740 ± 10 pc) |
| Characteristics | |
| Spectral type | G2V[2] |
| Details[2] | |
| Mass | 1.16±0.06 M☉ |
| Radius | 1.05±0.03 R☉ |
| Temperature | 5781±85 K |
| Metallicity [Fe/H] | 0.26 (± 0.1) dex |
| Rotation | 12.159±0.029 days[3] |
| Rotational velocity (v sin i) | 4.2±0.5[4] km/s |
| Age | 3.0±1.6[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
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[edit]
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]
| 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[edit]
- ^ 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.
- ^ a b c "Notes on Kepler-17 b". Extrasolar Planets Encyclopaedia. Retrieved 15 January 2017.
- ^ 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.
- ^ a b "Kepler-17". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 January 2017.
- ^ 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
- ^ 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.
- ^ 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
- ^ 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.
- ^ Planet Kepler-17 b on exoplanet.eu
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