Kepler-84 is aSun-likestar 3,339light-years from the Sun.[6] It is aG-type star. The stellar radius measurement has a large uncertainty of 48% as in 2017, complicating the modelling of the star.[7] The Kepler-84 star has two suspected stellar companions. Four stars, all more than four magnitudes fainter than Kepler-84, are seen within a fewarcseconds and at least one is probably gravitationally bound to Kepler-84.[8] Another, which has only a 0.005% chance of being a background star, is a yellow star with mass 0.855 M☉ at a projected separation of 0.18±0.05″ or 0.26″ (213.6AU).[9]
Kepler-84 is orbited by five known planets, four smallgas giants and aSuper-Earth. Planets Kepler-84b and Kepler-84c were confirmed in 2012[10] while the rest was confirmed in 2014.[11] To keep the known planetary system stable, no additional giant planets can be located within 7.4AU from the parent stars.[12]
^Sousa, S. G.; Adibekyan, V.; Delgado-Mena, E.; Santos, N. C.; Rojas-Ayala, B.; Barros, S. C. C.; Demangeon, O. D. S.; Hoyer, S.; Israelian, G.; Mortier, A.; Soares, B. M. T. B.; Tsantaki, M. (2024). "SWEET-Cat: A view on the planetary mass-radius relation".Astronomy and Astrophysics.691: A53.arXiv:2409.11965.Bibcode:2024A&A...691A..53S.doi:10.1051/0004-6361/202451704.
^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,S2CID39321033
