Imaginary Picture of K2-239 c

Display orbital revolution of K2-239 c around the hoststar K2-239
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Exoplanet Name : K2-239 c
Alternate Name : "K2-239 c, 2MASS J10422263+0426287 c, EPIC 248545986 c, WISE J104222.60+042628.8 c"
Status : Confirmed
Radius (Rjup / Re): 0.0890 (Rjup) 0.9976 (Rearth)
Mass (Mjup / Me): 0.0028 (Mjup) 0.8902 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0576 (AU) 0.0576 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0213
Orbital Period(Observed/Estimated) 7.78 (Days Obs.) 7.98 (Days Est.)
Surface Gravity (G Earth) 0.8945
Star Radiation at Atmospheric Boundary: 6553.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 401.6 (K)
Blackbody T 0.3(K) 377.1 (K)
Blackbody T 0.7(K) 305.1 (K)
Tidally Locked Blackbody T 0.1(K) 477.5 (K)
Tidally Locked Blackbody T 0.3(K) 448.5 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-239
Alternate Name : "K2-239, 2MASS J10422263+0426287, EPIC 248545986, WISE J104222.60+042628.8"
Star Distance(LY) : 159.8
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3420 (K)
Spectral type : M3.0 V
UV portion[%]: 0.3
Visible portion[%]: 12.2
IR portion[%]: 87.5
Metalicity : -0.1
Absolute Magnitude: 11.1
Apparent Magnitude: 14.5
Right Ascension(RA) 160.5943
Declination (DEC) 4.4413
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
K2-239 c
K2-239 c

  • K2-239 c is an exoplanet orbiting the star K2-239, located about 159.8 light-years (49.0 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-239 has apparent magnitude of 14.5, with absolute magnitude of 11.1.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3420 with its spectral types of M3.0 V
  • In this planetary system, the extrasolar planet K2-239 c orbits around the star K2-239 every 7.8 days with its orbital distance of 0.06 AU ( 8616837.4 km)
  • (Projected orbit of K2-239 c around its host star K2-239)


  • The Star K2-239 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.091 AU ( 13646234.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.126 AU ( 18862662.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.192 AU ( 28742522.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.283 AU ( 42295881.3 km)
  • Radiation at Planetary Boundary of K2-239 c : 6553.44 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-239)



  • Kopparapu Recent Venus for Star K2-239 distance : 0.103 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-239 distance : 0.131 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-239 distance : 0.126 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-239 distance : 0.139 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-239 distance : 0.255 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-239 distance : 0.269 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-239)



  • Original Kopparapu Recent Venus for Star K2-239 distance : 0.102 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-239 distance : 0.135 AU
  • Original Kopparapu Moist Greenhouse for Star K2-239 distance : 0.135 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-239 distance : 0.259 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-239 distance : 0.269 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-239)



    (Position in Stellar Map of star K2-239 and its Exoplanet K2-239 c)



    (Zoomed position in Stellar Map of star K2-239 and its Exoplanet K2-239 c (zoom level 3))

    (Synthetic Spectrum of star K2-239*)
    *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