Astronomy:KELT-20
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Short description: Star in Cygnus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 38m 38.735s[1] |
| Declination | +31° 31′ 09.22″[1] |
| Apparent magnitude (V) | 7.58[2] |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | A2V[3] |
| Variable type | planetary transit |
| Astrometry | |
| Proper motion (μ) | RA: 3.096±0.068[1] mas/yr Dec.: −6.157±0.075[1] mas/yr |
| Parallax (π) | 7.3015 ± 0.0433[1] mas |
| Distance | 447 ± 3 ly (137.0 ± 0.8 pc) |
| Details | |
| Mass | 2.3[4] M☉ |
| Radius | 1.6[4] R☉ |
| Luminosity | 15.7[4] L☉ |
| Surface gravity (log g) | 4.38[4] cgs |
| Temperature | 9,032[4] K |
| Metallicity [Fe/H] | −0.02±0.07[5] dex |
| Age | 0.200[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
KELT-20, also known as MASCARA-2, is an A2 main sequence star in the constellation of Cygnus, about 447 light years away.
Nomenclature
KELT-20 is the star's KELT designation. It is also designated as MASCARA-2 meaning that it is the second star observed by the MASCARA exoplanet search program. Its Henry Draper Catalogue designation is HD 185603, and its Hipparcos designation is HIP 96618.
Planetary system
In 2017, the discovery of the planet KELT-20b was announced.[6][7][8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 3.382 MJ | 0.05 | 3.6127647 | — | 86.12° | 1.741 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. ISBN 978-0333750889. Bibcode: 2000A&A...355L..27H.
- ↑ Lund, Michael B. et al. (2017). "KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early a Star HD 185603". The Astronomical Journal 154 (5): 194. doi:10.3847/1538-3881/aa8f95. Bibcode: 2017AJ....154..194L.
- ↑ 4.0 4.1 4.2 4.3 4.4 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 5.0 5.1 Talens, G. J. J.; Justesen, A. B.; Albrecht, S.; McCormac, J.; Van Eylen, V.; Otten, G. P. P. L.; Murgas, F.; Palle, E. et al. (2018). "MASCARA-2 b. A hot Jupiter transiting the mV = 7.6 A-star HD 185603". Astronomy and Astrophysics 612. doi:10.1051/0004-6361/201731512. Bibcode: 2018A&A...612A..57T.
- ↑ Yan, F.; Reiners, A.; Pallé, E.; Shulyak, D.; Stangret, M.; Molaverdikhani, K.; Nortmann, L.; Mollière, P. et al. (2022), "Detection of iron emission lines and a temperature inversion on the dayside of the ultra-hot Jupiter KELT-20b", Astronomy & Astrophysics 659: A7, doi:10.1051/0004-6361/202142395, Bibcode: 2022A&A...659A...7Y
- ↑ Fu, Guangwei; Sing, David K.; Lothringer, Joshua D.; Deming, Drake; Ih, Jegug; Kempton, Eliza M. -R.; Malik, Matej; Komacek, Thaddeus D. et al. (2022), "Strong H2O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation", The Astrophysical Journal Letters 925 (1): L3, doi:10.3847/2041-8213/ac4968, Bibcode: 2022ApJ...925L...3F
- ↑ Kasper, David; Bean, Jacob L.; Line, Michael R.; Seifahrt, Andreas; Brady, Madison T.; Lothringer, Joshua; Pino, Lorenzo; Fu, Guangwei et al. (2023), "Unifying High- and Low-resolution Observations to Constrain the Dayside Atmosphere of KELT-20b/MASCARA-2b", The Astronomical Journal 165 (1): 7, doi:10.3847/1538-3881/ac9f40, Bibcode: 2023AJ....165....7K
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