Kepler-25
Yellow-white hued star in the constellation Lyra
From Wikipedia, the free encyclopedia
Kepler-25 is a star in the northern constellation of Lyra.[1] It is slightly larger and more massive than the Sun, with a luminosity 21⁄2 times that of the Sun.[5] With an apparent visual magnitude of 10.6,[3] this star is too faint to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra[1] |
| Right ascension | 19h 06m 33.2141s[2] |
| Declination | +39° 29′ 16.359″[2] |
| Apparent magnitude (V) | 10.623±0.053[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F[4] |
| Apparent magnitude (B) | 11.337±0.016[3] |
| Variable type | Planetary transit variable |
| Astrometry | |
| Proper motion (μ) | RA: −0.303(14) mas/yr[2] Dec.: 6.109(13) mas/yr[2] |
| Parallax (π) | 4.1456±0.0113 mas[2] |
| Distance | 787 ± 2 ly (241.2 ± 0.7 pc) |
| Details | |
| Mass | 1.159+0.040 −0.051[5] M☉ |
| Radius | 1.297±0.015[5] R☉ |
| Luminosity | 2.406+0.126 −0.128[5] L☉ |
| Surface gravity (log g) | 4.275+0.007 −0.008[5] cgs |
| Temperature | 6270±79[6] K |
| Metallicity [Fe/H] | −0.05±0.10[6] dex |
| Rotation | 23.147±0.039 days[7] |
| Rotational velocity (v sin i) | 9.5[8] km/s |
| Age | 3.45+0.81 −0.72[5] Gyr |
| Other designations | |
| KOI-244, KIC 4349452, TYC 3124-1264-1, 2MASS J19063321+3929164, Gaia DR2 2100451630105041152[9] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| KIC | data |
Planetary system
In 2011, two candidate planets were found transiting this star by the Kepler space telescope.[10] These planets are very close to yet not lie in the 1:2 orbital resonance to each other, indicating the absence of other planetary objects in the inner part of the planetary systems.[11] These planets were confirmed through transit-timing variation method.[12] A third planet was discovered through follow-up radial velocity measurements and was confirmed in January 2014.[8]
The plane of planetary orbits is well aligned with the equatorial plane of the star, misalignment angle equal to 7±8°[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 8.7+2.5 −2.3 M🜨 |
0.068 | 6.238297±0.000017 | 0.0029+0.0023 −0.0017 |
92.827+0.084 −0.083° |
2.748+0.038 −0.035 R🜨 |
| c | 15.2+1.3 −1.6 M🜨 |
0.11 | 12.7207±0.0001 | 0.0061+0.0049 −0.0041 |
92.764+0.042 −0.039° |
5.217+0.070 −0.065 R🜨 |
| d | 71.9±9.8 M🜨 | — | 122.4+0.0 −0.7 |
0.13+0.13 −0.09 |
— | — |