Kepler-725
Sun-like star in the Lyra constellation with two exoplanets
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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.[5] It has a spectral type of G9V,[4] which classifies it as a yellow dwarf star.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra[1] |
| Right ascension | 18h 55m 54.59951s[2] |
| Declination | +44° 48′ 41.5433″[2] |
| Apparent magnitude (V) | 15.23[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G9V[4] |
| Apparent magnitude (J) | 13.685±0.027[3] |
| Apparent magnitude (H) | 13.283±0.026[3] |
| Apparent magnitude (K) | 13.222±0.038[3] |
| Astrometry | |
| Proper motion (μ) | RA: −0.500 mas/yr[2] Dec.: +4.995 mas/yr[2] |
| Parallax (π) | 1.2912±0.0233 mas[2] |
| Distance | 2,530 ± 50 ly (770 ± 10 pc) |
| Details[4] | |
| Mass | 0.95±0.01 M☉ |
| Radius | 0.88+0.05 −0.03 R☉ |
| Surface gravity (log g) | 4.53±0.06 cgs |
| Temperature | 5,395±64 K |
| Metallicity [Fe/H] | 0.12±0.04 dex |
| Rotation | 17.459±0.022 d |
| Age | 1.60±0.04 Gyr |
| Other designations | |
| Kepler-725, KOI-918, KIC 8672910, 2MASS J18555459+4448416[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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.[6] 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.[4][7] This planet receives an average insolation 1.4 times that of Earth, varying depending on its position in its eccentric orbit.[7] 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).[4]
Another planetary candidate with a period of 5.7 days, designated KOI-918.02, is a false positive.[8]
| 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.