Kepler-84
| 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 ( | RA: -0.150 mas/yr Dec.: -2.872 mas/yr |
| Parallax ( | 0.6929 ± 0.7043 mas |
| Details | |
| Mass | 1[2] M☉ |
| Radius | 1.2 R☉ |
| Temperature | 5755[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 4700 light years from the Sun. Kepler-84 is a G-type star. The stellar radius measurement has a large uncertainty of 48% as in 2017, complicating the modelling of the star.[5] 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.[6]. Another (which is a background star with a probability 0.5%) is an yellow star of mass 0.855M☉ on projected separations of 0.18±0.05″ or 0.26″ (213.6
Planetary system
Kepler-84 is orbited by five known planets, four small gas giants and a Super-Earth, discovered in 2014.[8] To keep known planetary system stable, no additional giant planets can be located within 7.4
| Companion (in order from star) |
Mass | Semimajor axis ( |
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
- ^ 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.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ 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.
- ^ 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.
- ^ Planetary migration and the origin of the 2:1 and 3:2 (near)-resonant population of close-in exoplanets, 2017, arXiv:1704.06459
- ^ ASSESSING THE EFFECT OF STELLAR COMPANIONS FROM HIGH-RESOLUTION IMAGING OF Kepler OBJECTS OF INTEREST, 2017, arXiv:1701.06577
- ^ THE IMPACT OF STELLAR MULTIPLICITY ON PLANETARY SYSTEMS, I.: THE RUINOUS INFLUENCE OF CLOSE BINARY COMPANIONS, 2016, arXiv:1604.05744
- ^ openexoplanetcatalogue.com Kepler-84
- ^ Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems, 2017, arXiv:1702.07714
- ^ The densities of planets in multiple stellar systems, 2017, arXiv:1707.01942
- ^ Planet Kepler-84 d at exoplanets.eu
- ^ Planet Kepler-84 e at exoplanets.eu
- ^ Planet Kepler-84 f at exoplanets.eu
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