Imaginary Picture of Kepler-1218 b

Display orbital revolution of Kepler-1218 b around the hoststar Kepler-1218
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Exoplanet Name : Kepler-1218 b
Alternate Name : "2MASS J19261895+4431541 b, K02389.01, KIC 8494617 b, KOI-2389 b, KOI-2389.01, WISE J192618.93+443154.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.1280 (Rjup) 1.4348 (Rearth)
Mass (Mjup / Me): 0.0114 (Mjup) 3.6156 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.1610 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0628
Orbital Period(Observed/Estimated) 22.92 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.7564
Star Radiation at Atmospheric Boundary: 109245.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 811.4 (K)
Blackbody T 0.3(K) 762.0 (K)
Blackbody T 0.7(K) 616.5 (K)
Tidally Locked Blackbody T 0.1(K) 964.9 (K)
Tidally Locked Blackbody T 0.3(K) 906.2 (K)
Size Class: super-Earth-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-1218
Alternate Name : "2MASS J19261895+4431541, KIC 8494617, KOI-2389, WISE J192618.93+443154.0"
Star Distance(LY) : 2740.3
Stellar Radius(Rsun) : 1.4 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 3.8 (GY)
Temperature : 5832 (K)
Spectral type : G1
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.0
Absolute Magnitude: 2.9
Apparent Magnitude: 12.5
Right Ascension(RA) 291.5790
Declination (DEC) 44.5317
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton1, Stephen T. Bryson2, Jeffrey L. Coughlin2,3, Jason F. Rowe4, Ganesh Ravichandran5, Erik A. Petigura6,7, Michael R. Haas2, and Natalie M. Batalha15"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 441 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-1218+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-1218%20b/
Kepler-1218 b
Kepler-1218 b

  • Kepler-1218 b is an exoplanet orbiting the star Kepler-1218, located about 2740.3 light-years (840.2 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-1218 has apparent magnitude of 12.5, with absolute magnitude of 2.9.
  • It is 1.1 times more massive and 1.4 times bigger compared with our Sun. The surface temperature is 5832 with its spectral types of G1
  • In this planetary system, the extrasolar planet Kepler-1218 b orbits around the star Kepler-1218 every 22.9 days with its orbital distance of 0.16 AU ( 24088170.8 km)
  • (Projected orbit of Kepler-1218 b around its host star Kepler-1218)


  • The Star Kepler-1218 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.041 AU ( 155752599.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.439 AU ( 215290796.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.193 AU ( 328055529.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.227 AU ( 482748082.9 km)
  • Radiation at Planetary Boundary of Kepler-1218 b : 109245.20 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1218)



  • Kopparapu Recent Venus for Star Kepler-1218 distance : 1.076 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1218 distance : 1.362 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1218 distance : 1.315 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1218 distance : 1.442 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1218 distance : 2.402 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1218 distance : 2.533 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1218)



  • Original Kopparapu Recent Venus for Star Kepler-1218 distance : 1.078 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1218 distance : 1.399 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1218 distance : 1.427 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1218 distance : 2.444 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1218 distance : 2.542 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1218)



    (Position in Stellar Map of star Kepler-1218 and its Exoplanet Kepler-1218 b)



    (Zoomed position in Stellar Map of star Kepler-1218 and its Exoplanet Kepler-1218 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1218*)
    *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