Kepler-45, formerly known as KOI-254, is a star in the northern constellation of Cygnus. It is located at the celestial coordinates: right ascension 19h 31m 29.495s, declination +41° 03′ 51.37″.[6] With an apparent visual magnitude of 16.88,[4] this star is too faint to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 31m 29.4966s[2] |
| Declination | +41° 03′ 51.356″[2] |
| Apparent magnitude (V) | 16.88[3] |
| Characteristics | |
| Spectral type | M1 V[4] |
| Astrometry | |
| Proper motion (μ) | RA: 4.646(36) mas/yr[2] Dec.: −21.589(36) mas/yr[2] |
| Parallax (π) | 2.5984 ± 0.0331 mas[2] |
| Distance | 1,260 ± 20 ly (385 ± 5 pc) |
| Details | |
| Mass | 0.59 ± 0.06[5] M☉ |
| Radius | 0.55 ± 0.11[5] R☉ |
| Temperature | 3820 ± 90[5] K |
| Metallicity [Fe/H] | 0.13 ± 0.13[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
The star is exhibiting strong starspot activity, with 4.1±2.5% of its surface covered by starspots.[7]
Planetary system
edit| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.5505 MJ | 0.030 | 2.455239 | — | — | 11 R🜨 |
The "Hot Jupiter" class planet Kepler-45b,[9] discovered in February 2011,[10] is unusually massive for the M-class parent star.[11] Its orbit is aligned within 11 degrees of rotational axis of the star.[12]
The planet is strongly suspected to have optically thick rings, because its planetary shadow appears to be elongated.[13]
See also
editReferences
edit- ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
- ^ a b c d 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.
- ^ "Kepler-45". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 January 2018.
- ^ a b Muirhead, Philip S.; Hamren, Katherine; Schlawin, Everett; Rojas-Ayala, Bárbara; Covey, Kevin R.; et al. (May 2012). "Characterizing the Cool Kepler Objects of Interests. New Effective Temperatures, Metallicities, Masses, and Radii of Low-mass Kepler Planet-candidate Host Stars". The Astrophysical Journal Letters. 750 (2). L37. arXiv:1109.1819. Bibcode:2012ApJ...750L..37M. doi:10.1088/2041-8205/750/2/L37. S2CID 27131741.
- ^ a b c d Kepler-45b, NASA Ames Research Center, archived from the original on 2015-09-19, retrieved 2011-12-06
- ^ "Kepler Discoveries". 2011-12-05. Archived from the original on 2010-05-27.
- ^ Activity and differential rotation of the early M dwarf Kepler-45 from transit mapping
- ^ Schneider, Jean, "Star: Kepler-45", Extrasolar Planets Encyclopaedia, archived from the original on 2014-03-04, retrieved 2011-12-06
- ^ Kepler-45 b at exoplanet.eu
- ^ Ford, Eric B.; Rowe, Jason F.; Fabrycky, Daniel C.; Carter, Joshua A.; Holman, Matthew J.; Lissauer, Jack J.; Ragozzine, Darin; Steffen, Jason H.; Batalha, Natalie M.; Borucki, William J.; Bryson, Steve; Caldwell, Douglas A.; Dunham, Edward W.; Gautier, Thomas N.; Jenkins, Jon M.; Koch, David G.; Li, Jie; Lucas, Philip; Marcy, Geoffrey W.; McCauliff, Sean; Mullally, Fergal R.; Quintana, Elisa; Still, Martin; Tenenbaum, Peter; Thompson, Susan E.; Twicken, Joseph D. (2011), "Transit Timing Observations from Kepler : I. Statistical Analysis of the First Four Months", The Astrophysical Journal Supplement Series, 197 (1): 2, arXiv:1102.0544, Bibcode:2011ApJS..197....2F, doi:10.1088/0067-0049/197/1/2, S2CID 118472942
- ^ Gaidos, E.; Mann, A. W.; Kraus, A. L.; Ireland, M. (2016). "They are small worlds after all: Revised properties of Kepler M dwarf stars and their planets". Monthly Notices of the Royal Astronomical Society. 457 (3): 2877–2899. arXiv:1512.04437. Bibcode:2016MNRAS.457.2877G. doi:10.1093/mnras/stw097. S2CID 53705225.
- ^ Dai, Fei; Winn, Joshua N.; Berta-Thompson, Zachory; Sanchis-Ojeda, Roberto; Albrecht, Simon (2018). "Stellar Obliquity and Magnetic Activity of Planet-hosting Stars and Eclipsing Binaries Based on Transit Chord Correlation". The Astronomical Journal. 155 (4): 177. arXiv:1803.05000. Bibcode:2018AJ....155..177D. doi:10.3847/1538-3881/aab618. S2CID 59454470.
- ^ Revealing peculiar exoplanetary shadows from transit light curves