Kepler-138
Red dwarf in the constellation Lyra / From Wikipedia, the free encyclopedia
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Kepler-138, also known as KOI-314, is a red dwarf[3][10] located in the constellation Lyra, 219 light years from Earth.[1] It is located within the field of vision of the Kepler spacecraft, the satellite that NASA's Kepler Mission used to detect planets transiting their stars.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 21m 31.56798s[1] |
Declination | +43° 17′ 34.6810″[1] |
Apparent magnitude (V) | 13.040±0.092[2] |
Characteristics | |
Spectral type | M1V[3] |
Apparent magnitude (V) | 13.040±0.092[2] |
Apparent magnitude (Kepler) | 12.925[4] |
Astrometry | |
Radial velocity (Rv) | −37.25±0.72[1] km/s |
Proper motion (μ) | RA: −20.461±0.012 mas/yr[1] Dec.: 22.641±0.012 mas/yr[1] |
Parallax (π) | 14.9019 ± 0.0097 mas[1] |
Distance | 218.9 ± 0.1 ly (67.11 ± 0.04 pc) |
Absolute magnitude (MV) | 8.81 ± 0.28 |
Details | |
Mass | 0.535±0.012[5] M☉ |
Radius | 0.535+0.013 −0.014[5] R☉ |
Luminosity (bolometric) | 0.056±0.004[5] L☉ |
Luminosity (visual, LV) | 0.026 ± 0.006 L☉ |
Surface gravity (log g) | 4.71±0.03[5] cgs |
Temperature | 3726+44 −40[6] K |
Metallicity [Fe/H] | -0.28 ± 0.10[3] dex |
Rotation | 19.394±0.013 days[7] |
Rotational velocity (v sin i) | ~3[8] km/s |
Age | >1[8] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
KIC | data |
The star hosts three confirmed planets and a likely fourth, including the lowest-mass exoplanet with a measured mass and size discovered to date, Kepler-138b,[11] with a mass comparable to that of Mars. Kepler-138d is remarkable for its low density; initially thought likely to be a gas dwarf,[8] more recent observations as of 2022 show that it, as well as planet c, are likely to be ocean worlds.[12][13]