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 | |
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 | |
Database references | |
SIMBAD | data |
KIC | data |
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.
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 |
— | — |
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 | |
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 | |
Database references | |
SIMBAD | data |
KIC | data |
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.
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 |
— | — |