Imaginary Picture of K2-357 b

Display orbital revolution of K2-357 b around the hoststar K2-357
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Exoplanet Name : K2-357 b
Alternate Name : EPIC 211730267 b
Status : Confirmed
Radius (Rjup / Re): 0.3319 (Rjup) 3.7203 (Rearth)
Mass (Mjup / Me): 0.0282 (Mjup) 8.9526 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1450 (AU) 0.1450 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0448
Orbital Period(Observed/Estimated) 16.35 (Days Obs.) 20.37 (Days Est.)
Surface Gravity (G Earth) 0.6468
Star Radiation at Atmospheric Boundary: 65732.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 714.6 (K)
Blackbody T 0.3(K) 671.1 (K)
Blackbody T 0.7(K) 543.0 (K)
Tidally Locked Blackbody T 0.1(K) 849.9 (K)
Tidally Locked Blackbody T 0.3(K) 798.1 (K)
Size Class: 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 : K2-357
Alternate Name : EPIC 211730267
Star Distance(LY) : 1688.5
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5794 (K)
Spectral type : G2V
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : -0.0
Absolute Magnitude: 5.1
Apparent Magnitude: 13.6
Right Ascension(RA) 131.9387
Declination (DEC) 16.3289
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
K2-357 b
K2-357 b

  • K2-357 b is an exoplanet orbiting the star K2-357, located about 1688.5 light-years (517.7 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star K2-357 has apparent magnitude of 13.6, with absolute magnitude of 5.1.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5794 with its spectral types of G2V
  • In this planetary system, the extrasolar planet K2-357 b orbits around the star K2-357 every 16.3 days with its orbital distance of 0.14 AU ( 21691691.3 km)
  • (Projected orbit of K2-357 b around its host star K2-357)


  • The Star K2-357 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.727 AU ( 108796542.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.005 AU ( 150385253.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.532 AU ( 229153846.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.254 AU ( 337209923.8 km)
  • Radiation at Planetary Boundary of K2-357 b : 65732.90 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-357)



  • Kopparapu Recent Venus for Star K2-357 distance : 0.753 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-357 distance : 0.954 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-357 distance : 0.921 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-357 distance : 1.010 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-357 distance : 1.683 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-357 distance : 1.775 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-357)



  • Original Kopparapu Recent Venus for Star K2-357 distance : 0.754 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-357 distance : 0.980 AU
  • Original Kopparapu Moist Greenhouse for Star K2-357 distance : 0.998 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-357 distance : 1.713 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-357 distance : 1.781 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-357)



    (Position in Stellar Map of star K2-357 and its Exoplanet K2-357 b)



    (Zoomed position in Stellar Map of star K2-357 and its Exoplanet K2-357 b (zoom level 3))

    (Synthetic Spectrum of star K2-357*)
    *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