Imaginary Picture of K2-39 b

Display orbital revolution of K2-39 b around the hoststar K2-39
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Exoplanet Name : K2-39 b
Alternate Name : "2MASS J22332842-0901219 b, EPIC 206247743 b, EPIC 206247743.01, TYC 5811-00835-1 b, WISE J223328.38-090122.4 b"
Status : Confirmed
Radius (Rjup / Re): 0.5600 (Rjup) 6.2770 (Rearth)
Mass (Mjup / Me): 0.0900 (Mjup) 28.6144 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0620 (AU) 0.0620 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0126
Orbital Period(Observed/Estimated) 4.61 (Days Obs.) 6.94 (Days Est.)
Surface Gravity (G Earth) 0.7262
Star Radiation at Atmospheric Boundary: 1597237.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1586.7 (K)
Blackbody T 0.3(K) 1490.0 (K)
Blackbody T 0.7(K) 1205.6 (K)
Tidally Locked Blackbody T 0.1(K) 1886.9 (K)
Tidally Locked Blackbody T 0.3(K) 1772.0 (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 : "2MASS J22332842-0901219, EPIC 206247743, TYC 5811-835-1, WISE J223328.38-090122.4"
Star Distance(LY) : 1011.5
Stellar Radius(Rsun) : 3.0 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 1.5 (Msun Estimated)
Star Age : 3.1 (GY)
Temperature : 4881 (K)
Spectral type : K2
UV portion[%]: 2.7
Visible portion[%]: 36.0
IR portion[%]: 61.3
Metalicity : 0.3
Absolute Magnitude: 3.4
Apparent Magnitude: 10.8
Right Ascension(RA) 338.3684
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 1011.5 light-years (310.1 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 3.4.
  • It is 0.7 times more massive and 3.0 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 ) : 1.533 AU ( 229314848.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.119 AU ( 316973047.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.229 AU ( 482996779.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.751 AU ( 710750919.1 km)
  • Radiation at Planetary Boundary of K2-39 b : 1597237.73 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 : 1.667 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-39 distance : 2.111 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-39 distance : 2.039 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-39 distance : 2.238 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-39 distance : 3.845 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-39 distance : 4.056 AU

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



  • Original Kopparapu Recent Venus for Star K2-39 distance : 1.648 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-39 distance : 2.176 AU
  • Original Kopparapu Moist Greenhouse for Star K2-39 distance : 2.181 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-39 distance : 3.909 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-39 distance : 4.065 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))

    (Synthetic Spectrum of star K2-39*)
    *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