Imaginary Picture of K2-105 b

Display orbital revolution of K2-105 b around the hoststar K2-105
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Exoplanet Name : K2-105 b
Alternate Name : "2MASS J08214087+1329512 b, EPIC 211525389 b, EPIC 211525389
Radius (Rjup / Re): 0.3010 (Rjup) 3.3739 (Rearth)
Mass (Mjup / Me): 0.0940 (Mjup) 29.8862 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0796 (AU) 0.0796 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0226
Orbital Period(Observed/Estimated) 8.27 (Days Obs.) 8.24 (Days Est.)
Surface Gravity (G Earth) 2.6254
Star Radiation at Atmospheric Boundary: 142857.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 867.7 (K)
Blackbody T 0.3(K) 814.9 (K)
Blackbody T 0.7(K) 659.3 (K)
Tidally Locked Blackbody T 0.1(K) 1031.9 (K)
Tidally Locked Blackbody T 0.3(K) 969.0 (K)
Size Class: Neptune-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 : K2-105
Alternate Name : "2MASS J08214087+1329512, EPIC 211525389, TYC 807-1019-1, WISE J#'4JKɎ@*@;@
Star Distance(LY) : 650.0
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.6 (GY)
Temperature : 5464 (K)
Spectral type : K1
UV portion[%]: 6.7
Visible portion[%]: 43.0
IR portion[%]: 50.3
Metalicity : 0.2
Absolute Magnitude: 5.5
Apparent Magnitude: 12.0
Right Ascension(RA) 125.4203
Declination (DEC) 13.4975
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=K2-105&submit=SIMBAD+search
Open Exoplanet Database Link
K2-105 b
K2-105 b

  • K2-105 b is an exoplanet orbiting the star K2-105, located about 650.0 light-years (199.3 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star K2-105 has apparent magnitude of 12.0, with absolute magnitude of 5.5.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5464 with its spectral types of K1
  • In this planetary system, the extrasolar planet K2-105 b orbits around the star K2-105 every 8.3 days with its orbital distance of 0.08 AU ( 11907990.5 km)
  • (Projected orbit of K2-105 b around its host star K2-105)


  • The Star K2-105 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.589 AU ( 88048281.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.814 AU ( 121705735.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.240 AU ( 185452607.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.824 AU ( 272901635.9 km)
  • Radiation at Planetary Boundary of K2-105 b : 142857.89 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-105)



  • Kopparapu Recent Venus for Star K2-105 distance : 0.621 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-105 distance : 0.787 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-105 distance : 0.760 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-105 distance : 0.833 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-105 distance : 1.402 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-105 distance : 1.479 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-105)



  • Original Kopparapu Recent Venus for Star K2-105 distance : 0.619 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-105 distance : 0.809 AU
  • Original Kopparapu Moist Greenhouse for Star K2-105 distance : 0.819 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-105 distance : 1.427 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-105 distance : 1.484 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-105)



    (Position in Stellar Map of star K2-105 and its Exoplanet K2-105 b)



    (Zoomed position in Stellar Map of star K2-105 and its Exoplanet K2-105 b (zoom level 3))

    (Synthetic Spectrum of star K2-105*)
    *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