Astronomy:Kepler-17
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Short description: Star in the constellation Cygnus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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
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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 "Notes on Kepler-17 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/kepler_17_b--870/.
- ↑ 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. doi:10.1088/2041-8205/775/1/L11. Bibcode: 2013ApJ...775L..11M.
- ↑ 4.0 4.1 "Kepler-17". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-17.
- ↑ 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, doi:10.3847/1538-3881/aad3b7, Bibcode: 2018AJ....156...91M
- ↑ Valio, Adriana et al. (2017). "Activity and Rotation of Kepler-17". The Astrophysical Journal 835 (2): 294. doi:10.3847/1538-4357/835/2/294. Bibcode: 2017ApJ...835..294V.
- ↑ 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, doi:10.1051/0004-6361/201833894, Bibcode: 2019A&A...626A..38L
- ↑ 8.0 8.1 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. doi:10.1088/0067-0049/197/1/14. Bibcode: 2011ApJS..197...14D.
- ↑ Planet Kepler-17 b on exoplanet.eu
Coordinates: 
19h 53m 34.86s, +47° 48′ 54″
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