Imaginary Picture of Kepler-204 c

Display orbital revolution of Kepler-204 c around the hoststar Kepler-204
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Exoplanet Name : Kepler-204 c
Alternate Name : "2MASS J19012332+4145429 c, K00661.02, KIC 6347299 c, KOI-661 c, KOI-661.02, WISE J190123.31+414542.7 c"
Status : Confirmed
Radius (Rjup / Re): 0.1600 (Rjup) 1.7934 (Rearth)
Mass (Mjup / Me): 0.0143 (Mjup) 4.5419 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1730 (AU) 0.1730 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0703
Orbital Period(Observed/Estimated) 25.66 (Days Obs.) 26.82 (Days Est.)
Surface Gravity (G Earth) 1.4121
Star Radiation at Atmospheric Boundary: 48004.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 660.6 (K)
Blackbody T 0.3(K) 620.4 (K)
Blackbody T 0.7(K) 502.0 (K)
Tidally Locked Blackbody T 0.1(K) 785.6 (K)
Tidally Locked Blackbody T 0.3(K) 737.8 (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-204
Alternate Name : "2MASS J19012332+4145429, KIC 6347299, KOI-661, WISE J190123.31+414542.7"
Star Distance(LY) : 2238.7
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5877 (K)
Spectral type : G2
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.2
Absolute Magnitude: 3.7
Apparent Magnitude: 12.8
Right Ascension(RA) 285.3472
Declination (DEC) 41.7619
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-204+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-204%20c/
Kepler-204 c
Kepler-204 c

  • Kepler-204 c is an exoplanet orbiting the star Kepler-204, located about 2238.7 light-years (686.4 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-204 has apparent magnitude of 12.8, with absolute magnitude of 3.7.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5877 with its spectral types of G2
  • In this planetary system, the extrasolar planet Kepler-204 c orbits around the star Kepler-204 every 25.7 days with its orbital distance of 0.17 AU ( 25880431.6 km)
  • (Projected orbit of Kepler-204 c around its host star Kepler-204)


  • The Star Kepler-204 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.742 AU ( 110928502.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.025 AU ( 153332178.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.562 AU ( 233644308.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.298 AU ( 343817835.0 km)
  • Radiation at Planetary Boundary of Kepler-204 c : 48004.58 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-204)



  • Kopparapu Recent Venus for Star Kepler-204 distance : 0.764 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-204 distance : 0.967 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-204 distance : 0.934 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-204 distance : 1.024 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-204 distance : 1.704 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-204 distance : 1.797 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-204)



  • Original Kopparapu Recent Venus for Star Kepler-204 distance : 0.766 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-204 distance : 0.994 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-204 distance : 1.014 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-204 distance : 1.734 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-204 distance : 1.803 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-204)



    (Position in Stellar Map of star Kepler-204 and its Exoplanet Kepler-204 c)



    (Zoomed position in Stellar Map of star Kepler-204 and its Exoplanet Kepler-204 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-204*)
    *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