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Kepler-17
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| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 53m 34.8643s[2] |
| Declination | +47° 48′ 54.050″[2] |
| Apparent magnitude (V) | 14.0[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G2V[4] |
| Astrometry | |
| Radial velocity (Rv) | −25.82±4.64[2] km/s |
| Proper motion (μ) | RA: −3.811(17) mas/yr[2] Dec.: −6.339(19) mas/yr[2] |
| Parallax (π) | 1.4115±0.0151 mas[2] |
| Distance | 2,310 ± 20 ly (708 ± 8 pc) |
| Details[4] | |
| Mass | 1.16±0.06 M☉ |
| Radius | 1.05±0.03 R☉ |
| Surface gravity (log g) | 4.53±0.12 cgs |
| Temperature | 5781±85 K |
| Metallicity [Fe/H] | 0.26±0.10 dex |
| Rotation | 12.159±0.029 days[5] or 11.6±0.1 days[6] |
| Rotational velocity (v sin i) | 4.277±0.04[6] km/s |
| Age | 3.0±1.6[7] Gyr |
| Other designations | |
| Kepler-17, KOI-203, KIC 10619192, TOI-5794, TIC 273874849, 2MASS J19533486+4748540[8] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| KIC | data |
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.[9] Starspots are long-lived, with at least one persisting for 1400 days.[10]
Planetary system
[edit]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.[11] Its orbit is aligned with the host star's equator.[6]
| 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
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ "Notes on Kepler-17 b". Extrasolar Planets Encyclopaedia. Retrieved 15 January 2017.
- ^ a b Bonomo, A. S.; Hébrard, G.; et al. (February 2012). "SOPHIE velocimetry of Kepler transit candidates: V. The three hot Jupiters KOI-135b, KOI-204b, and KOI-203b (alias Kepler-17b)". Astronomy & Astrophysics. 538: A96. arXiv:1110.5462. Bibcode:2012A&A...538A..96B. doi:10.1051/0004-6361/201118323. ISSN 0004-6361.
- ^ 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 c 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. arXiv:2510.07130. Bibcode:2026ApJ...997..297S. doi:10.3847/1538-4357/ae2bdb. ISSN 0004-637X.
- ^ 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
- ^ "Kepler-17". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 January 2017.
- ^ 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
- ^ 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.
- ^ 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. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. ISSN 0004-6361.
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