Kepler-84
From Wikipedia the free encyclopedia
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 01h 37m 40.87964s[1] |
| Declination | +12° 04′ 42.1742″[1] |
| Characteristics | |
| Spectral type | G3[2] |
| Astrometry | |
| Proper motion (μ) | RA: −0.150 mas/yr Dec.: −2.872 mas/yr |
| Parallax (π) | 0.6929 ± 0.7043 mas |
| Details | |
| Mass | 1[2] M☉ |
| Radius | 1.2 R☉ |
| Temperature | 5,755[3] K |
| Metallicity [Fe/H] | +0.09 ± 0.04[2] dex |
| Age | 4.9[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Kepler-84 is a Sun-like star 3,339 light-years from the Sun.[5] It is a G-type star. The stellar radius measurement has a large uncertainty of 48% as in 2017, complicating the modelling of the star.[6] The Kepler-84 star has two suspected stellar companions. Four red dwarfs are few arcseconds away and at least one is probably gravitationally bound to Kepler-84.[7] Another (which is a background star with a probability 0.5%) is a yellow star of mass 0.855M☉ on projected separations of 0.18±0.05″ or 0.26″ (213.6 AU).[8]
Planetary system
[edit]Kepler-84 is orbited by five known planets, four small gas giants and a Super-Earth. Planets Kepler-84b and Kepler-84c were confirmed in 2012[9] while the rest was confirmed in 2014.[10] To keep the known planetary system stable, no additional giant planets can be located within 7.4 AU from the parent stars.[11]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.126±0.038 MJ | 0.083 | 8.725854±0.00006 | 0 | 88.24° | 0.174±0.045 RJ |
| c | 0.064±0.037 MJ | 0.108 | 12.882525±0.000093 | 0 | 88.24° | 0.184±0.047 RJ |
| d | — | 0.052 | 4.224537±0.000042 | — | — | 0.123±0.024 RJ |
| e | — | 0.181 | 27.434389±0.000224 | — | — | 0.232±0.044 RJ |
| f | — | 0.25 | 44.552169±0.000812 | — | — | 0.196±0.038 RJ |
References
[edit]- ^ a b c "Kepler-84". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 13, 2016.
- ^ a b c Vidotto, A. A; Gregory, S. G; Jardine, M; Donati, J. F; Petit, P; Morin, J; Folsom, C. P; Bouvier, J; Cameron, A. C; Hussain, G; Marsden, S; Waite, I. A; Fares, R; Jeffers, S; Do Nascimento, J. D (2014). "Stellar magnetism: Empirical trends with age and rotation" (PDF). Monthly Notices of the Royal Astronomical Society. 441 (3): 2361. arXiv:1404.2733. Bibcode:2014MNRAS.441.2361V. doi:10.1093/mnras/stu728. S2CID 43200119.
- ^ Gray, R. O; Corbally, C. J; Garrison, R. F; McFadden, M. T; Robinson, P. E (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. S2CID 119417105.
- ^ Melendez, Jorge; Dodds-Eden, Katie; Robles, Jose A (2006). "HD 98618: A Star Closely Resembling our Sun". The Astrophysical Journal. 641 (2): L133–L136. arXiv:astro-ph/0603219. Bibcode:2006ApJ...641L.133M. doi:10.1086/503898. S2CID 17479387.
- ^ "Kepler-84 b - NASA Science". science.nasa.gov. Retrieved 2024-09-13.
- ^ Ramos, X. S.; Charalambous, C.; Benítez-Llambay, P.; Beaugé, C. (2017), "Planetary migration and the origin of the 2:1 and 3:2 (near)-resonant population of close-in exoplanets", Astronomy & Astrophysics, 602: A101, arXiv:1704.06459, Bibcode:2017A&A...602A.101R, doi:10.1051/0004-6361/201629642, S2CID 119369796
- ^ Hirsch, Lea A.; Ciardi, David R.; Howard, Andrew W.; Everett, Mark E.; Furlan, Elise; Saylors, Mindy; Horch, Elliott P.; Howell, Steve B.; Teske, Johanna; Marcy, Geoffrey W. (2017), "ASSESSING THE EFFECT OF STELLAR COMPANIONS FROM HIGH-RESOLUTION IMAGING OF Kepler OBJECTS OF INTEREST", The Astronomical Journal, 153 (3): 117, arXiv:1701.06577, Bibcode:2017AJ....153..117H, doi:10.3847/1538-3881/153/3/117, S2CID 39321033
- ^ Kraus, Adam L.; Ireland, Michael J.; Huber, Daniel; Mann, Andrew W.; Dupuy, Trent J. (2016), "The Impact of Stellar Multiplicity on Planetary Systems. I. The Ruinous Influence of Close Binary Companions", The Astronomical Journal, 152 (1): 8, arXiv:1604.05744, Bibcode:2016AJ....152....8K, doi:10.3847/0004-6256/152/1/8, S2CID 119110229
- ^ Xie, Ji-Wei (2012), "Transit Timing Variation of Near-Resonance Planetary Pairs: Confirmation of 12 Multiple-Planet Systems", The Astrophysical Journal Supplement Series, 208 (2): 22, arXiv:1208.3312, Bibcode:2013ApJS..208...22X, doi:10.1088/0067-0049/208/2/22, S2CID 17160267
- ^ openexoplanetcatalogue.com Kepler-84
- ^ Becker, Juliette C.; Adams, Fred C. (2017), "Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems", Monthly Notices of the Royal Astronomical Society, 468 (1): 549–563, arXiv:1702.07714, Bibcode:2017MNRAS.468..549B, doi:10.1093/mnras/stx461, S2CID 119325005
- ^ Furlan, E.; Howell, S. B. (2017), "The densities of planets in multiple stellar systems", The Astronomical Journal, 154 (2): 66, arXiv:1707.01942, Bibcode:2017AJ....154...66F, doi:10.3847/1538-3881/aa7b70, S2CID 28833730
- ^ Planet Kepler-84 d at exoplanets.eu
- ^ Planet Kepler-84 e at exoplanets.eu
- ^ Planet Kepler-84 f at exoplanets.eu
2012 in space | ||
|---|---|---|
Space probe launches  |
|    |
| Impact events | ||
| Selected NEOs | ||
| Exoplanets |
| |
| Discoveries | ||
| Comets | ||
| Space exploration | ||
 | This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it. |