Kepler-31

Kepler-31

A diagram of the Kepler-31 System, compared to our Inner Solar System.
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 36m 05.523s
Declination +45° 51 11.09
Apparent magnitude (V) [2]
Characteristics
Spectral type G5[3]
Astrometry
Distance15237[3] ly
Details
Mass1,21±017[2] M
Radius1.22±0.24[2] R
Luminosity0.79 ± 0.04[2] L
Temperature6340±200[2] K
Metallicity [Fe/H]–0.076±0.400[2] dex
Rotational velocity (v sin i)[2] km/s
Other designations

Kepler-31 is a star in the northern constellation of Cygnus, the swan, that is orbited by a planet found to be unequivocally within the star's habitable zone. It is located at the celestial coordinates: Right Ascension 19h 36m 05.523s}, Declination +45° 51 11.09.[4] With an apparent visual magnitude of 14.0,[2] this star is too faint to be seen with the naked eye.

The Kepler-31 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 6.8 MJ 0.16 20.8613 4.1 R
c 4.7 MJ 0.26 42.6318 4.1 R

References

  1. "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
  2. 1 2 3 4 5 6 7 8 Kepler-31b, NASA Ames Research Center, retrieved 2011-12-06
  3. 1 2 3 Schneider, Jean, "Star: Kepler-23", Extrasolar Planets Encyclopaedia (Paris Observatory), retrieved 2011-12-06
  4. "Kepler Discoveries". 2011-12-05.

Coordinates: 19h 36m 05.523s, +45° 51′ 11.09″

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