Imaginary Picture of K2-224 b

Display orbital revolution of K2-224 b around the hoststar K2-224
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Exoplanet Name : K2-224 b
Alternate Name : "2MASS J12384898-1003384 b, EPIC 228725972 b, EPIC 228725972.01, WISE J123848.98-100338.2 b"
Status : Confirmed
Radius (Rjup / Re): 0.1390 (Rjup) 1.5581 (Rearth)
Mass (Mjup / Me): 0.0125 (Mjup) 3.9849 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0516 (AU) 0.0516 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0123
Orbital Period(Observed/Estimated) 4.48 (Days Obs.) 4.49 (Days Est.)
Surface Gravity (G Earth) 1.6415
Star Radiation at Atmospheric Boundary: 324197.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1065.0 (K)
Blackbody T 0.3(K) 1000.1 (K)
Blackbody T 0.7(K) 809.2 (K)
Tidally Locked Blackbody T 0.1(K) 1266.5 (K)
Tidally Locked Blackbody T 0.3(K) 1189.4 (K)
Size Class: super-Earth-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 : K2-224
Alternate Name : "2MASS J12384898-1003384, EPIC 228725972, WISE J123848.98-100338.2"
Star Distance(LY) : 900.7
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5620 (K)
Spectral type : G6
UV portion[%]: 7.3
Visible portion[%]: 44.0
IR portion[%]: 48.7
Metalicity : -0.2
Absolute Magnitude: 4.1
Apparent Magnitude: 11.4
Right Ascension(RA) 189.7041
Declination (DEC) -10.0607
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=K2-224+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-224 b
K2-224 b

  • K2-224 b is an exoplanet orbiting the star K2-224, located about 900.7 light-years (276.2 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-224 has apparent magnitude of 11.4, with absolute magnitude of 4.1.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5620 with its spectral types of G6
  • In this planetary system, the extrasolar planet K2-224 b orbits around the star K2-224 every 4.5 days with its orbital distance of 0.05 AU ( 7719250.1 km)
  • (Projected orbit of K2-224 b around its host star K2-224)


  • The Star K2-224 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.575 AU ( 85982492.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.794 AU ( 118850274.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.211 AU ( 181101516.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.781 AU ( 266498815.2 km)
  • Radiation at Planetary Boundary of K2-224 b : 324197.19 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-224)



  • Kopparapu Recent Venus for Star K2-224 distance : 0.601 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-224 distance : 0.761 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-224 distance : 0.735 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-224 distance : 0.806 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-224 distance : 1.351 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-224 distance : 1.425 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-224)



  • Original Kopparapu Recent Venus for Star K2-224 distance : 0.600 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-224 distance : 0.783 AU
  • Original Kopparapu Moist Greenhouse for Star K2-224 distance : 0.794 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-224 distance : 1.374 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-224 distance : 1.429 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-224)



    (Position in Stellar Map of star K2-224 and its Exoplanet K2-224 b)



    (Zoomed position in Stellar Map of star K2-224 and its Exoplanet K2-224 b (zoom level 3))

    (Synthetic Spectrum of star K2-224*)
    *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