Imaginary Picture of K2-231 b

Display orbital revolution of K2-231 b around the hoststar K2-231
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Exoplanet Name : K2-231 b
Alternate Name : "2MASS J19162203-1546159 b, EPIC 219800881 b, EPIC 219800881.01, WISE J191622.03-154616.4 b"
Status : Confirmed
Radius (Rjup / Re): 0.2230 (Rjup) 2.4996 (Rearth)
Mass (Mjup / Me): 0.0227 (Mjup) 7.2172 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.1132 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0379
Orbital Period(Observed/Estimated) 13.84 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.1551
Star Radiation at Atmospheric Boundary: 90852.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 774.9 (K)
Blackbody T 0.3(K) 727.7 (K)
Blackbody T 0.7(K) 588.8 (K)
Tidally Locked Blackbody T 0.1(K) 921.5 (K)
Tidally Locked Blackbody T 0.3(K) 865.4 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-231
Alternate Name : "2MASS J19162203-1546159, EPIC 219800881, WISE J191622.03-154616.4"
Star Distance(LY) : 1022.6
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 3.0 (GY)
Temperature : 5695 (K)
Spectral type : G4
UV portion[%]: 7.6
Visible portion[%]: 44.4
IR portion[%]: 48.0
Metalicity : 0.1
Absolute Magnitude: 5.2
Apparent Magnitude: 12.7
Right Ascension(RA) 289.0918
Declination (DEC) -15.7711
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-231&submit=SIMBAD+search
Open Exoplanet Database Link
K2-231 b
K2-231 b

  • K2-231 b is an exoplanet orbiting the star K2-231, located about 1022.6 light-years (313.5 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-231 has apparent magnitude of 12.7, with absolute magnitude of 5.2.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5695 with its spectral types of G4
  • In this planetary system, the extrasolar planet K2-231 b orbits around the star K2-231 every 13.8 days with its orbital distance of 0.11 AU ( 16934389.6 km)
  • (Projected orbit of K2-231 b around its host star K2-231)


  • The Star K2-231 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.667 AU ( 99854852.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.923 AU ( 138025501.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.406 AU ( 210320319.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.069 AU ( 309495563.1 km)
  • Radiation at Planetary Boundary of K2-231 b : 90852.87 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-231)



  • Kopparapu Recent Venus for Star K2-231 distance : 0.695 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-231 distance : 0.880 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-231 distance : 0.850 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-231 distance : 0.932 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-231 distance : 1.558 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-231 distance : 1.644 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-231)



  • Original Kopparapu Recent Venus for Star K2-231 distance : 0.695 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-231 distance : 0.905 AU
  • Original Kopparapu Moist Greenhouse for Star K2-231 distance : 0.920 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-231 distance : 1.586 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-231 distance : 1.649 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-231)



    (Position in Stellar Map of star K2-231 and its Exoplanet K2-231 b)



    (Zoomed position in Stellar Map of star K2-231 and its Exoplanet K2-231 b (zoom level 3))

    (Synthetic Spectrum of star K2-231*)
    *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