Kepler-138

Kepler-138

Artist's impression of the planets orbiting Kepler-138
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]
Distance218.9 ± 0.1 ly
(67.11 ± 0.04 pc)
Absolute magnitude (MV)8.81 ± 0.28
Details
Mass0.535±0.012[5] M☉
Radius0.535+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
Temperature3726+44
−40[6] K
Metallicity [Fe/H]-0.28 ± 0.10[3] dex
Rotation19.394±0.013 days[7]
Rotational velocity (v sin i)~3[8] km/s
Age>1[8] Gyr
Other designations
Kepler-138, KOI-314, KIC 7603200, TIC 159376971, 2MASS J19213157+4317347[9]
Database references
SIMBADdata
Exoplanet Archivedata
KICdata

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.

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference NASAExoplanetArchive was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Pineda was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference kepler-catalogue was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Piaulet2022 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Mann2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference McQuillan2013 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Kipping was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Mann was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Jontof-Hutter was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference NASA2022 was invoked but never defined (see the help page).
  13. ^ Timmer, John (15 December 2022). "Scientists may have found the first water worlds". Ars Technica. Retrieved 17 December 2022.