Imaginary Picture of K2-243 b

Display orbital revolution of K2-243 b around the hoststar K2-243
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Exoplanet Name : K2-243 b
Alternate Name : "2MASS J12042913-0453572 b, EPIC 201166680 b, EPIC 201166680.02, TYC 4942-667-1 b, WISE J120429.09-045356.9 b"
Status : Confirmed
Radius (Rjup / Re): 0.1940 (Rjup) 2.1745 (Rearth)
Mass (Mjup / Me): 0.0171 (Mjup) 5.4333 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1087 (AU) 0.1087 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0316
Orbital Period(Observed/Estimated) 11.54 (Days Obs.) 11.52 (Days Est.)
Surface Gravity (G Earth) 1.1490
Star Radiation at Atmospheric Boundary: 373625.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1103.4 (K)
Blackbody T 0.3(K) 1036.3 (K)
Blackbody T 0.7(K) 838.4 (K)
Tidally Locked Blackbody T 0.1(K) 1312.2 (K)
Tidally Locked Blackbody T 0.3(K) 1232.3 (K)
Size Class: sub-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 : K2-243
Alternate Name : "2MASS J12042913-0453572, EPIC 201166680, TYC 4942-667-1, WISE J120429.09-045356.9"
Star Distance(LY) : 850.6
Stellar Radius(Rsun) : 1.4 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6570 (K)
Spectral type : F6
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.0
Absolute Magnitude: 2.8
Apparent Magnitude: 9.9
Right Ascension(RA) 181.1214
Declination (DEC) -4.8992
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=K2-243+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-243 b
K2-243 b

  • K2-243 b is an exoplanet orbiting the star K2-243, located about 850.6 light-years (260.8 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-243 has apparent magnitude of 9.9, with absolute magnitude of 2.8.
  • It is 1.3 times more massive and 1.4 times bigger compared with our Sun. The surface temperature is 6570 with its spectral types of F6
  • In this planetary system, the extrasolar planet K2-243 b orbits around the star K2-243 every 11.5 days with its orbital distance of 0.11 AU ( 16261288.5 km)
  • (Projected orbit of K2-243 b around its host star K2-243)


  • The Star K2-243 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.300 AU ( 194448076.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.797 AU ( 268778057.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.738 AU ( 409558278.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.029 AU ( 602682949.0 km)
  • Radiation at Planetary Boundary of K2-243 b : 373625.75 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-243)



  • Kopparapu Recent Venus for Star K2-243 distance : 1.285 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-243 distance : 1.627 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-243 distance : 1.571 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-243 distance : 1.721 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-243 distance : 2.827 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-243 distance : 2.982 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-243)



  • Original Kopparapu Recent Venus for Star K2-243 distance : 1.309 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-243 distance : 1.668 AU
  • Original Kopparapu Moist Greenhouse for Star K2-243 distance : 1.732 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-243 distance : 2.879 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-243 distance : 2.994 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-243)



    (Position in Stellar Map of star K2-243 and its Exoplanet K2-243 b)



    (Zoomed position in Stellar Map of star K2-243 and its Exoplanet K2-243 b (zoom level 3))

    (Synthetic Spectrum of star K2-243*)
    *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