Imaginary Picture of Kepler-218 d

Display orbital revolution of Kepler-218 d around the hoststar Kepler-218
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Exoplanet Name : Kepler-218 d
Alternate Name : "2MASS J19413907+4615592 d, K00711.03, KIC 9597345 d, KOI-711 d, KOI-711.03, WISE J194139.08+461559.6 d"
Status : Confirmed
Radius (Rjup / Re): 0.2370 (Rjup) 2.6565 (Rearth)
Mass (Mjup / Me): 0.0206 (Mjup) 6.5453 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.3372 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.3409
Orbital Period(Observed/Estimated) 124.52 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.9275
Star Radiation at Atmospheric Boundary: 11707.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 464.3 (K)
Blackbody T 0.3(K) 436.0 (K)
Blackbody T 0.7(K) 352.8 (K)
Tidally Locked Blackbody T 0.1(K) 552.1 (K)
Tidally Locked Blackbody T 0.3(K) 518.5 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-218
Alternate Name : "2MASS J19413907+4615592, KIC 9597345, KOI-711, WISE J194139.08+461559.6"
Star Distance(LY) : 2139.8
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5594 (K)
Spectral type : G7
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : 0.2
Absolute Magnitude: 3.6
Apparent Magnitude: 12.7
Right Ascension(RA) 295.4128
Declination (DEC) 46.2665
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-218+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-218%20d/
Kepler-218 d
Kepler-218 d

  • Kepler-218 d is an exoplanet orbiting the star Kepler-218, located about 2139.8 light-years (656.1 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-218 has apparent magnitude of 12.7, with absolute magnitude of 3.6.
  • It is 0.3 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5594 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-218 d orbits around the star Kepler-218 every 124.5 days with its orbital distance of 0.34 AU ( 50451377.8 km)
  • (Projected orbit of Kepler-218 d around its host star Kepler-218)


  • The Star Kepler-218 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.714 AU ( 106790201.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.987 AU ( 147611966.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.504 AU ( 224927970.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.213 AU ( 330991362.4 km)
  • Radiation at Planetary Boundary of Kepler-218 d : 11707.28 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-218)



  • Kopparapu Recent Venus for Star Kepler-218 distance : 0.748 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-218 distance : 0.947 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-218 distance : 0.915 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-218 distance : 1.003 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-218 distance : 1.681 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-218 distance : 1.773 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-218)



  • Original Kopparapu Recent Venus for Star Kepler-218 distance : 0.746 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-218 distance : 0.974 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-218 distance : 0.988 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-218 distance : 1.711 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-218 distance : 1.779 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-218)



    (Position in Stellar Map of star Kepler-218 and its Exoplanet Kepler-218 d)



    (Zoomed position in Stellar Map of star Kepler-218 and its Exoplanet Kepler-218 d (zoom level 3))

    (Synthetic Spectrum of star Kepler-218*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102