Imaginary Picture of K2-253 b

Display orbital revolution of K2-253 b around the hoststar K2-253
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Exoplanet Name : K2-253 b
Alternate Name : "2MASS J12242051-0622439 b, EPIC 228809550 b, EPIC 228809550.01, WISE J122420.48-062244.1 b"
Status : Confirmed
Radius (Rjup / Re): 1.1300 (Rjup) 12.6662 (Rearth)
Mass (Mjup / Me): 1.4144 (Mjup) 449.6831 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0506 (AU) 0.0506 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0110
Orbital Period(Observed/Estimated) 4.00 (Days Obs.) 4.00 (Days Est.)
Surface Gravity (G Earth) 2.8030
Star Radiation at Atmospheric Boundary: 764705.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1319.8 (K)
Blackbody T 0.3(K) 1239.5 (K)
Blackbody T 0.7(K) 1002.8 (K)
Tidally Locked Blackbody T 0.1(K) 1569.5 (K)
Tidally Locked Blackbody T 0.3(K) 1474.0 (K)
Size Class: Jupiter-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 : K2-253
Alternate Name : "2MASS J12242051-0622439, EPIC 228809550, WISE J122420.48-062244.1"
Star Distance(LY) : 2941.3
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6027 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 3.7
Apparent Magnitude: 13.5
Right Ascension(RA) 186.0854
Declination (DEC) -6.3789
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
K2-253 b
K2-253 b

  • K2-253 b is an exoplanet orbiting the star K2-253, located about 2941.3 light-years (901.8 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-253 has apparent magnitude of 13.5, with absolute magnitude of 3.7.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 6027 with its spectral types of G0
  • In this planetary system, the extrasolar planet K2-253 b orbits around the star K2-253 every 4.0 days with its orbital distance of 0.05 AU ( 7569652.3 km)
  • (Projected orbit of K2-253 b around its host star K2-253)


  • The Star K2-253 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.866 AU ( 129495053.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.197 AU ( 178996005.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.823 AU ( 272750300.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.683 AU ( 401364015.9 km)
  • Radiation at Planetary Boundary of K2-253 b : 764704.97 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-253)



  • Kopparapu Recent Venus for Star K2-253 distance : 0.884 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-253 distance : 1.119 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-253 distance : 1.081 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-253 distance : 1.185 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-253 distance : 1.964 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-253 distance : 2.072 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-253)



  • Original Kopparapu Recent Venus for Star K2-253 distance : 0.889 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-253 distance : 1.149 AU
  • Original Kopparapu Moist Greenhouse for Star K2-253 distance : 1.177 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-253 distance : 1.999 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-253 distance : 2.079 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-253)



    (Position in Stellar Map of star K2-253 and its Exoplanet K2-253 b)



    (Zoomed position in Stellar Map of star K2-253 and its Exoplanet K2-253 b (zoom level 3))

    (Synthetic Spectrum of star K2-253*)
    *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