Imaginary Picture of K2-245 b

Display orbital revolution of K2-245 b around the hoststar K2-245
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Exoplanet Name : K2-245 b
Alternate Name : "2MASS J12204359-0135271 b, EPIC 201357643 b, EPIC 201357643.01, WISE J122043.58-013527.2 b"
Radius (Rjup / Re): 0.3870 (Rjup) 4.3379 (Rearth)
Mass (Mjup / Me): 0.0568 (Mjup) 18.0636 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0959 (AU) 0.0959 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0326
Orbital Period(Observed/Estimated) 11.89 (Days Obs.) 11.91 (Days Est.)
Surface Gravity (G Earth) 0.9599
Star Radiation at Atmospheric Boundary: 234639.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 982.3 (K)
Blackbody T 0.3(K) 922.5 (K)
Blackbody T 0.7(K) 746.4 (K)
Tidally Locked Blackbody T 0.1(K) 1168.2 (K)
Tidally Locked Blackbody T 0.3(K) 1097.0 (K)
Size Class: Neptune-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 : K2-245
Alternate Name : "2MASS J12204359-0135271, EPIC 201357643, WISE J122043.58-013527.2"
Star Distance(LY) : 1511.4
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5793 (K)
Spectral type : G2
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.5
Absolute Magnitude: 3.2
Apparent Magnitude: 11.5
Right Ascension(RA) 185.1817
Declination (DEC) -1.5909
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
K2-245 b
K2-245 b

  • K2-245 b is an exoplanet orbiting the star K2-245, located about 1511.4 light-years (463.4 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-245 has apparent magnitude of 11.5, with absolute magnitude of 3.2.
  • It is 0.8 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5793 with its spectral types of G2
  • In this planetary system, the extrasolar planet K2-245 b orbits around the star K2-245 every 11.9 days with its orbital distance of 0.10 AU ( 14346435.8 km)
  • (Projected orbit of K2-245 b around its host star K2-245)


  • The Star K2-245 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.909 AU ( 135948738.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.256 AU ( 187916684.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.914 AU ( 286343441.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.817 AU ( 421366917.7 km)
  • Radiation at Planetary Boundary of K2-245 b : 234639.83 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-245)



  • Kopparapu Recent Venus for Star K2-245 distance : 0.941 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-245 distance : 1.192 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-245 distance : 1.151 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-245 distance : 1.262 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-245 distance : 2.104 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-245 distance : 2.219 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-245)



  • Original Kopparapu Recent Venus for Star K2-245 distance : 0.943 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-245 distance : 1.225 AU
  • Original Kopparapu Moist Greenhouse for Star K2-245 distance : 1.247 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-245 distance : 2.141 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-245 distance : 2.226 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-245)



    (Position in Stellar Map of star K2-245 and its Exoplanet K2-245 b)



    (Zoomed position in Stellar Map of star K2-245 and its Exoplanet K2-245 b (zoom level 3))

    (Synthetic Spectrum of star K2-245*)
    *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