Imaginary Picture of K2-120 b

Display orbital revolution of K2-120 b around the hoststar K2-120
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Exoplanet Name : K2-120 b
Alternate Name : "EPIC 211791178 b, 2MASS J08483431+1711267 b, EPIC 211791178.01, WISE J084834.28+171126.8 b"
Status : Confirmed
Radius (Rjup / Re): 0.1790 (Rjup) 2.0064 (Rearth)
Mass (Mjup / Me): 0.0159 (Mjup) 5.0415 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0780 (AU) 0.0780 (AU Est.)
Eccentricity : 0.1400
Orbital Period(Yrs) 0.0262
Orbital Period(Observed/Estimated) 9.56 (Days Obs.) 9.58 (Days Est.)
Surface Gravity (G Earth) 1.2523
Star Radiation at Atmospheric Boundary: 32368.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 598.7 (K)
Blackbody T 0.3(K) 562.2 (K)
Blackbody T 0.7(K) 454.9 (K)
Tidally Locked Blackbody T 0.1(K) 711.9 (K)
Tidally Locked Blackbody T 0.3(K) 668.6 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-120
Alternate Name : "EPIC 211791178, 2MASS J08483431+1711267, WISE J084834.28+171126.8"
Star Distance(LY) : 944.4
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4349 (K)
Spectral type : M0V
UV portion[%]: 1.1
Visible portion[%]: 28.4
IR portion[%]: 70.5
Metalicity : 0.0
Absolute Magnitude: 4.7
Apparent Magnitude: 12.0
Right Ascension(RA) 132.1430
Declination (DEC) 17.1907
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=K2-120&submit=SIMBAD+search
Open Exoplanet Database Link
K2-120 b
K2-120 b

  • K2-120 b is an exoplanet orbiting the star K2-120, located about 944.4 light-years (289.5 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star K2-120 has apparent magnitude of 12.0, with absolute magnitude of 4.7.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4349 with its spectral types of M0V
  • In this planetary system, the extrasolar planet K2-120 b orbits around the star K2-120 every 9.6 days with its orbital distance of 0.08 AU ( 11668633.9 km)
  • (Projected orbit of K2-120 b around its host star K2-120)


  • The Star K2-120 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.275 AU ( 41068773.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.379 AU ( 56767777.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.578 AU ( 86501529.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.851 AU ( 127290790.4 km)
  • Radiation at Planetary Boundary of K2-120 b : 32368.52 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-120)



  • Kopparapu Recent Venus for Star K2-120 distance : 0.305 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-120 distance : 0.386 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-120 distance : 0.373 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-120 distance : 0.409 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-120 distance : 0.720 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-120 distance : 0.759 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-120)



  • Original Kopparapu Recent Venus for Star K2-120 distance : 0.301 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-120 distance : 0.398 AU
  • Original Kopparapu Moist Greenhouse for Star K2-120 distance : 0.398 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-120 distance : 0.731 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-120 distance : 0.760 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-120)



    (Position in Stellar Map of star K2-120 and its Exoplanet K2-120 b)



    (Zoomed position in Stellar Map of star K2-120 and its Exoplanet K2-120 b (zoom level 3))

    (Synthetic Spectrum of star K2-120*)
    *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