Imaginary Picture of K2-59 b

Display orbital revolution of K2-59 b around the hoststar K2-59
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Exoplanet Name : K2-59 b
Alternate Name : EPIC 206027655.01
Status : Confirmed
Radius (Rjup / Re): 0.2150 (Rjup) 2.4099 (Rearth)
Mass (Mjup / Me): 0.0188 (Mjup) 5.9783 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1354 (AU) 0.1354 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0567
Orbital Period(Observed/Estimated) 20.69 (Days Obs.) 20.74 (Days Est.)
Surface Gravity (G Earth) 1.0294
Star Radiation at Atmospheric Boundary: 23275.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 551.3 (K)
Blackbody T 0.3(K) 517.7 (K)
Blackbody T 0.7(K) 418.9 (K)
Tidally Locked Blackbody T 0.1(K) 655.6 (K)
Tidally Locked Blackbody T 0.3(K) 615.7 (K)
Size Class: sub-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 : K2-59
Alternate Name : "2MASS J22354616-1401398, EPIC 206027655, WISE J223546.19-140139.8"
Star Distance(LY) : 1028.7
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5055 (K)
Spectral type : K1
UV portion[%]: 3.6
Visible portion[%]: 37.8
IR portion[%]: 58.6
Metalicity : 0.0
Absolute Magnitude: 5.0
Apparent Magnitude: 12.5
Right Ascension(RA) 338.9424
Declination (DEC) -14.0277
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-59+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-59 b
K2-59 b

  • K2-59 b is an exoplanet orbiting the star K2-59, located about 1028.7 light-years (315.4 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-59 has apparent magnitude of 12.5, with absolute magnitude of 5.0.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 5055 with its spectral types of K1
  • In this planetary system, the extrasolar planet K2-59 b orbits around the star K2-59 every 20.7 days with its orbital distance of 0.14 AU ( 20255551.7 km)
  • (Projected orbit of K2-59 b around its host star K2-59)


  • The Star K2-59 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.404 AU ( 60453756.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.559 AU ( 83562889.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.851 AU ( 127331351.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.253 AU ( 187373662.3 km)
  • Radiation at Planetary Boundary of K2-59 b : 23275.44 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-59)



  • Kopparapu Recent Venus for Star K2-59 distance : 0.436 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-59 distance : 0.552 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-59 distance : 0.533 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-59 distance : 0.585 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-59 distance : 0.998 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-59 distance : 1.053 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-59)



  • Original Kopparapu Recent Venus for Star K2-59 distance : 0.432 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-59 distance : 0.569 AU
  • Original Kopparapu Moist Greenhouse for Star K2-59 distance : 0.571 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-59 distance : 1.015 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-59 distance : 1.056 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-59)



    (Position in Stellar Map of star K2-59 and its Exoplanet K2-59 b)



    (Zoomed position in Stellar Map of star K2-59 and its Exoplanet K2-59 b (zoom level 3))

    (Synthetic Spectrum of star K2-59*)
    *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