Imaginary Picture of K2-39 b
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Exoplanet Name : K2-39 b
Alternate Name :
Radius (Rjup / Re): 0.7300 (Rjup) 8.1826 (Rearth)
Mass (Mjup / Me): 0.1250 (Mjup) 39.7422 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0620 (AU) 0.0620 (AU Est.)
Eccentricity : 0.1520
Orbital Period(Yrs) 0.0126
Orbital Period(Observed/Estimated) 4.61 (Days Obs.) 4.56 (Days Est.)
Star Radiation at Atmospheric Boundary: 2725964.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1813.5 (K)
Blackbody T 0.3(K) 1703.1 (K)
Blackbody T 0.7(K) 1378.0 (K)
Tidally Locked Blackbody T 0.1(K) 2156.7 (K)
Tidally Locked Blackbody T 0.3(K) 2025.3 (K)
Size Class: sub-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-39
Alternate Name :
Star Distance(LY) : 831.7
Stellar Radius(Rsun) : 3.9 (Rsun Measured)
Stellar Mass(Msun) : 1.5 (Msun Measured) 1.5 (Msun Estimated)
Star Age : 3.1 (GY)
Temperature : 4881 (K)
Spectral type : K2
Metalicity : 0.3
Absolute Magnitude: 3.8
Apparent Magnitude: 10.8
Right Ascension(RA) 339.8667
Declination (DEC) -9.0228
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-39&submit=SIMBAD+search
Open Exoplanet Database Link
K2-39 b
K2-39 b

  • K2-39 b is an exoplanet orbiting the star K2-39, located about 831.7 light-years (255.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-39 has apparent magnitude of 10.8, with absolute magnitude of 3.8.
  • It is 1.5 times more massive and 3.9 times bigger compared with our Sun. The surface temperature is 4881 with its spectral types of K2
  • In this planetary system, the extrasolar planet K2-39 b orbits around the star K2-39 every 4.6 days with its orbital distance of 0.06 AU ( 9275068.0 km)
  • (Projected orbit of K2-39 b around its host star K2-39)


  • The Star K2-39 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.003 AU ( 299576300.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.768 AU ( 414092736.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 4.218 AU ( 630985691.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 6.207 AU ( 928523086.2 km)
  • Radiation at Planetary Boundary of K2-39 b : 2725963.98 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-39)



  • Kopparapu Recent Venus for Star K2-39 distance : 2.178 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-39 distance : 2.758 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-39 distance : 2.664 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-39 distance : 2.924 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-39 distance : 5.023 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-39 distance : 5.298 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-39)



  • Original Kopparapu Recent Venus for Star K2-39 distance : 2.153 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-39 distance : 2.843 AU
  • Original Kopparapu Moist Greenhouse for Star K2-39 distance : 2.849 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-39 distance : 5.107 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-39 distance : 5.311 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-39)



    (Position in Stellar Map of star K2-39 and its Exoplanet K2-39 b)



    (Zoomed position in Stellar Map of star K2-39 and its Exoplanet K2-39 b (zoom level 3))