Imaginary Picture of K2-22 b

Display orbital revolution of K2-22 b around the hoststar K2-22
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Exoplanet Name : K2-22 b
Alternate Name : "K2-22 b, 2MASS J11175587+0237086 b, EPIC 201637175 A b, EPIC 201637175 b, EPIC 201637175.01, K2-22 A b, WISE J111755.84Na
Radius (Rjup / Re): 0.2230 (Rjup) 2.4996 (Rearth)
Mass (Mjup / Me): 1.4000 (Mjup) 445.1132 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0088 (AU) 0.0088 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0010
Orbital Period(Observed/Estimated) 0.38 (Days Obs.) 0.39 (Days Est.)
Surface Gravity (G Earth) 71.2405
Star Radiation at Atmospheric Boundary: 1107093.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1447.7 (K)
Blackbody T 0.3(K) 1359.6 (K)
Blackbody T 0.7(K) 1100.0 (K)
Tidally Locked Blackbody T 0.1(K) 1721.7 (K)
Tidally Locked Blackbody T 0.3(K) 1616.8 (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 : K2-22
Alternate Name : "EPIC 201637175, K2-22, 2MASS J11175587+0237086, EPIC 201637175 A, K2-22 A, WISE J111755.84+023708.4"
Star Distance(LY) : 800.8
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3830 (K)
Spectral type : M0 V
UV portion[%]: 0.4
Visible portion[%]: 20.0
IR portion[%]: 79.5
Metalicity : 0.0
Absolute Magnitude: 10.0
Apparent Magnitude: 17.0
Right Ascension(RA) 169.4828
Declination (DEC) 2.6191
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=K2-22+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-22 b
K2-22 b

  • K2-22 b is an exoplanet orbiting the star K2-22, located about 800.8 light-years (245.5 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star K2-22 has apparent magnitude of 17.0, with absolute magnitude of 10.0.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3830 with its spectral types of M0 V
  • In this planetary system, the extrasolar planet K2-22 b orbits around the star K2-22 every 0.4 days with its orbital distance of 0.01 AU ( 1316461.3 km)
  • (Projected orbit of K2-22 b around its host star K2-22)


  • The Star K2-22 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.181 AU ( 27097580.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.250 AU ( 37455937.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.382 AU ( 57074560.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.561 AU ( 83987715.6 km)
  • Radiation at Planetary Boundary of K2-22 b : 1107093.43 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-22)



  • Kopparapu Recent Venus for Star K2-22 distance : 0.204 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-22 distance : 0.258 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-22 distance : 0.249 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-22 distance : 0.274 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-22 distance : 0.493 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-22 distance : 0.520 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-22)



  • Original Kopparapu Recent Venus for Star K2-22 distance : 0.201 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-22 distance : 0.267 AU
  • Original Kopparapu Moist Greenhouse for Star K2-22 distance : 0.266 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-22 distance : 0.501 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-22 distance : 0.521 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-22)



    (Position in Stellar Map of star K2-22 and its Exoplanet K2-22 b)



    (Zoomed position in Stellar Map of star K2-22 and its Exoplanet K2-22 b (zoom level 3))

    (Synthetic Spectrum of star K2-22*)
    *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