Imaginary Picture of K2-331 b

Display orbital revolution of K2-331 b around the hoststar K2-331
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Exoplanet Name : K2-331 b
Alternate Name : "EPIC 211502222 b, EPIC 211502222.02"
Status : Confirmed
Radius (Rjup / Re): 0.1597 (Rjup) 1.7901 (Rearth)
Mass (Mjup / Me): 0.0143 (Mjup) 4.5340 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0900 (AU) 0.0900 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0257
Orbital Period(Observed/Estimated) 9.40 (Days Obs.) 9.40 (Days Est.)
Surface Gravity (G Earth) 1.4149
Star Radiation at Atmospheric Boundary: 219582.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 966.1 (K)
Blackbody T 0.3(K) 907.3 (K)
Blackbody T 0.7(K) 734.1 (K)
Tidally Locked Blackbody T 0.1(K) 1148.9 (K)
Tidally Locked Blackbody T 0.3(K) 1079.0 (K)
Size Class: super-Earth-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 : K2-331
Alternate Name : EPIC 211502222
Star Distance(LY) : 689.6
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5994 (K)
Spectral type : F9/G0V
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : 0.1
Absolute Magnitude: 4.7
Apparent Magnitude: 11.3
Right Ascension(RA) 132.7377
Declination (DEC) 13.1704
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
K2-331 b
K2-331 b

  • K2-331 b is an exoplanet orbiting the star K2-331, located about 689.6 light-years (211.4 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star K2-331 has apparent magnitude of 11.3, with absolute magnitude of 4.7.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5994 with its spectral types of F9/G0V
  • In this planetary system, the extrasolar planet K2-331 b orbits around the star K2-331 every 9.4 days with its orbital distance of 0.09 AU ( 13463808.4 km)
  • (Projected orbit of K2-331 b around its host star K2-331)


  • The Star K2-331 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.825 AU ( 123423385.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.140 AU ( 170603373.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.738 AU ( 259961786.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.557 AU ( 382545156.7 km)
  • Radiation at Planetary Boundary of K2-331 b : 219582.88 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-331)



  • Kopparapu Recent Venus for Star K2-331 distance : 0.844 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-331 distance : 1.069 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-331 distance : 1.032 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-331 distance : 1.131 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-331 distance : 1.877 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-331 distance : 1.980 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-331)



  • Original Kopparapu Recent Venus for Star K2-331 distance : 0.849 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-331 distance : 1.097 AU
  • Original Kopparapu Moist Greenhouse for Star K2-331 distance : 1.123 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-331 distance : 1.911 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-331 distance : 1.987 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-331)



    (Position in Stellar Map of star K2-331 and its Exoplanet K2-331 b)



    (Zoomed position in Stellar Map of star K2-331 and its Exoplanet K2-331 b (zoom level 3))

    (Synthetic Spectrum of star K2-331*)
    *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