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Kepler-20

Kepler-20
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 19h 10m 47.52334s[1]
Declination +42° 20′ 19.3014″[1]
Apparent magnitude (V) 12.51[2]
Characteristics
Spectral type G8V[3]
Astrometry
Radial velocity (Rv)−21.98±0.92[1] km/s
Proper motion (μ) RA: −3.869 mas/yr[1]
Dec.: −27.105 mas/yr[1]
Parallax (π)3.4936 ± 0.0095 mas[1]
Distance934 ± 3 ly
(286.2 ± 0.8 pc)
Details
Mass0.929±0.053[4] M☉
Radius0.9164+0.0087
−0.0077[4] R☉
Temperature5495±50[4] K
Metallicity [Fe/H]0.07±0.08[4] dex
Age5.6+4.5
−3.5[4] Gyr
Other designations
KOI-070, KIC 6850504, 2MASS J19104752+4220194, Gaia DR2 2102548708017562112.[3]
Database references
SIMBADdata
KICdata

Kepler-20 is a star about 934 light-years (286 parsecs) from Earth in the constellation Lyra with a system of at least five, and possibly six, known planets.[5] The apparent magnitude of this star is 12.51, so it cannot be seen with the unaided eye. Viewing it requires a telescope with an aperture of 15 cm (6 in) or more.[6] It is slightly smaller than the Sun, with 94% of the Sun's radius and about 91% of the Sun's mass. The effective temperature of the photosphere is slightly cooler than that of the Sun at 5466 K, giving it the characteristic yellow hue of a stellar class G8 star.[7][8] The abundance of elements other than hydrogen or helium, what astronomers term the metallicity, is approximately the same as in the Sun. It may be older than the Sun, although the margin of error here is relatively large.[9]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference aj136_2_735 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Bonomo2023 was invoked but never defined (see the help page).
  5. ^ Johnson, Michele (20 December 2011). "NASA Discovers First Earth-size Planets Beyond Our Solar System". NASA. Retrieved 20 December 2011.
  6. ^ Cite error: The named reference sherrod_koed2003 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference NatureKepler-20ef was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference exoplanet was invoked but never defined (see the help page).

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