Imaginary Picture of Kepler-222 d

Display orbital revolution of Kepler-222 d around the hoststar Kepler-222
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Exoplanet Name : Kepler-222 d
Alternate Name : "2MASS J19113746+4656159 d, K00723.02, KIC 10002866 d, KOI-723 d, KOI-723.02, WISE J191137.46+465615.8 d"
Status : Confirmed
Radius (Rjup / Re): 0.3290 (Rjup) 3.6878 (Rearth)
Mass (Mjup / Me): 0.0279 (Mjup) 8.8798 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1800 (AU) 0.1800 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0769
Orbital Period(Observed/Estimated) 28.08 (Days Obs.) 80.52 (Days Est.)
Surface Gravity (G Earth) 0.6529
Star Radiation at Atmospheric Boundary: 20111.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 531.5 (K)
Blackbody T 0.3(K) 499.1 (K)
Blackbody T 0.7(K) 403.9 (K)
Tidally Locked Blackbody T 0.1(K) 632.1 (K)
Tidally Locked Blackbody T 0.3(K) 593.6 (K)
Size Class: 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-222
Alternate Name : "2MASS J19113746+4656159, KIC 10002866, KOI-723, WISE J191137.46+465615.8"
Star Distance(LY) : 2475.2
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.1 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5315 (K)
Spectral type : G7
UV portion[%]: 6.6
Visible portion[%]: 42.7
IR portion[%]: 50.7
Metalicity : 0.1
Absolute Magnitude: 4.3
Apparent Magnitude: 13.7
Right Ascension(RA) 287.9061
Declination (DEC) 46.9378
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-222+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-222%20d/
Kepler-222 d
Kepler-222 d

  • Kepler-222 d is an exoplanet orbiting the star Kepler-222, located about 2475.2 light-years (758.9 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-222 has apparent magnitude of 13.7, with absolute magnitude of 4.3.
  • It is 0.1 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5315 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-222 d orbits around the star Kepler-222 every 28.1 days with its orbital distance of 0.18 AU ( 26927616.7 km)
  • (Projected orbit of Kepler-222 d around its host star Kepler-222)


  • The Star Kepler-222 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.499 AU ( 74705884.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.690 AU ( 103263054.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.052 AU ( 157350043.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.548 AU ( 231547481.6 km)
  • Radiation at Planetary Boundary of Kepler-222 d : 20111.90 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-222)



  • Kopparapu Recent Venus for Star Kepler-222 distance : 0.532 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-222 distance : 0.673 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-222 distance : 0.650 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-222 distance : 0.713 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-222 distance : 1.206 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-222 distance : 1.272 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-222)



  • Original Kopparapu Recent Venus for Star Kepler-222 distance : 0.528 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-222 distance : 0.693 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-222 distance : 0.699 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-222 distance : 1.226 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-222 distance : 1.275 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-222)



    (Position in Stellar Map of star Kepler-222 and its Exoplanet Kepler-222 d)



    (Zoomed position in Stellar Map of star Kepler-222 and its Exoplanet Kepler-222 d (zoom level 3))

    (Synthetic Spectrum of star Kepler-222*)
    *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