Astronomy:Kepler-725
Kepler-725 is a Sun-like star located about 2,526 light-years (774 parsecs) away in the constellation of Lyra.[1] At an apparent magnitude of 15.1, it is too faint to be seen with the naked eye.[2] It has a spectral type of G9V,[3] which classifies it as a yellow dwarf star.
Planetary system
Kepler-725 has two confirmed planets. The transiting planet Kepler-725 b was discovered in 2016 and is a gas giant with orbital period of 40 days.[4] The non-transiting planet Kepler-725 c was found in 2025 via the transit-timing variation (TTV) method and has a mass of about 10 times Earth mass.[3][5] This planet receives an average insolation 1.4 times that of Earth, varying depending on its position in its eccentric orbit.[5] It is the first super-Earth partially in the habitable zone to be discovered via the TTV method, and the only known super-Earth in the habitable zone of a Sun-like star with a measured mass (that is not a minimum mass).[3]
Another planetary candidate with a period of 5.7 days, designated KOI-918.02, is a false positive.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 0.2238±0.0008 | 39.643151(59) | 0.231+0.050 −0.044 |
89.8±0.1° | 10.8±0.6 R⊕ |
| c | 9.7+3.3 −2.3 M⊕ |
0.6744±0.0023 | 207.541+0.348 −0.248 |
0.436±0.017 | — | — |
Notes
- ↑ The mass of planet b is not known, but the model used here assumes it has the mass of Jupiter.
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ "The Extrasolar Planet Encyclopaedia — Kepler-725 c.". Extrasolar Planets Encyclopaedia. 2025. https://exoplanet.eu/catalog/kepler_725_c--11052/.
- ↑ 3.0 3.1 3.2 3.3 Sun, L.; Gu, S.; Wang, X.; Schmitt, J. H. M. M.; Ioannidis, P.; Kouwenhoven, M. B. N.; Dou, J.; Zhao, G. (June 2025). "A temperate 10-Earth-mass exoplanet around the Sun-like star Kepler-725". nature 9 (8): 1184–1194. doi:10.1038/s41550-025-02565-z. Bibcode: 2025NatAs...9.1184S. https://www.nature.com/articles/s41550-025-02565-z.
- ↑ Morton, Timothy D.; Bryson, Stephen T.; Coughlin, Jeffrey L.; Rowe, Jason F.; Ravichandran, Ganesh; Petigura, Erik A.; Haas, Michael R.; Batalha, Natalie M. (2016). "False Positive Probabilities for All Kepler Objects of Interest: 1284 Newly Validated Planets and 428 Likely False Positives". The Astrophysical Journal 822 (2): 86. doi:10.3847/0004-637X/822/2/86. Bibcode: 2016ApJ...822...86M.
- ↑ 5.0 5.1 "A hidden 'super-Earth' exoplanet is dipping in and out of its habitable zone" (in en). 2025-06-06. https://www.space.com/astronomy/exoplanets/a-hidden-super-earth-exoplanet-is-dipping-in-and-out-of-its-habitable-zone.
- ↑ "Kepler-725 Overview". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-725.
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