Astronomy:Kepler-17
Kepler-17 is a main-sequence yellow dwarf star about 2,310 light-years (710 parsecs) away in the constellation Cygnus. It is much more active than the Sun, with starspots covering roughly 6% of its surface.[1] Starspots are long-lived, with at least one persisting for 1400 days.[2]
Planetary system
Kepler-17 is known to host one hot Jupiter exoplanet, Kepler-17b, in orbit around it. It was discovered by the Kepler mission using the transit method in 2011.[3] Its orbit is aligned with the host star's equator.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.47+0.12 −0.11 MJ |
0.02680+0.00046 −0.00048 |
1.48571091(21) | <0.020 | 87.22±0.15° | 1.33±0.04 RJ |
References
- ↑ 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
- ↑ 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.
- ↑ Sagynbayeva, Sabina; Farr, Will M. (February 2026). "Polka-dotted Stars. II. Starspots and Obliquities of Kepler-17 and Kepler-63". The Astrophysical Journal 997 (2): 297. doi:10.3847/1538-4357/ae2bdb. ISSN 0004-637X. Bibcode: 2026ApJ...997..297S.
- ↑ Bonomo, A. S.; Desidera, S. et al. (June 2017). "The GAPS Programme with HARPS-N at TNG: XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. ISSN 0004-6361. Bibcode: 2017A&A...602A.107B.
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Coordinates: 
19h 53m 34.86s, +47° 48′ 54″
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