Imaginary Picture of K2-201 c

Display orbital revolution of K2-201 c around the hoststar K2-201
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Exoplanet Name : K2-201 c
Alternate Name : "2MASS J19341458-2307518 c, EPIC 216008129 c, EPIC 216008129.02, TYC 6889-1358-1 c, WISE J193414.56-230752.3 c"
Status : Confirmed
Radius (Rjup / Re): 0.2930 (Rjup) 3.2842 (Rearth)
Mass (Mjup / Me): 0.0251 (Mjup) 7.9726 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.1551 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0624
Orbital Period(Observed/Estimated) 22.78 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.7391
Star Radiation at Atmospheric Boundary: 36288.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 616.0 (K)
Blackbody T 0.3(K) 578.5 (K)
Blackbody T 0.7(K) 468.1 (K)
Tidally Locked Blackbody T 0.1(K) 732.6 (K)
Tidally Locked Blackbody T 0.3(K) 687.9 (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 : K2-201
Alternate Name : "2MASS J19341458-2307518, EPIC 216008129, TYC 6889-1358-1, WISE J193414.56-230752.3"
Star Distance(LY) : 640.4
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5507 (K)
Spectral type : G7
UV portion[%]: 6.9
Visible portion[%]: 43.3
IR portion[%]: 49.8
Metalicity : 0.1
Absolute Magnitude: 4.2
Apparent Magnitude: 10.7
Right Ascension(RA) 293.5607
Declination (DEC) -23.1310
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-201&submit=SIMBAD+search
Open Exoplanet Database Link
K2-201 c
K2-201 c

  • K2-201 c is an exoplanet orbiting the star K2-201, located about 640.4 light-years (196.4 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-201 has apparent magnitude of 10.7, with absolute magnitude of 4.2.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5507 with its spectral types of G7
  • In this planetary system, the extrasolar planet K2-201 c orbits around the star K2-201 every 22.8 days with its orbital distance of 0.16 AU ( 23209009.3 km)
  • (Projected orbit of K2-201 c around its host star K2-201)


  • The Star K2-201 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.578 AU ( 86491003.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.799 AU ( 119553170.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.218 AU ( 182172574.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.792 AU ( 268074923.3 km)
  • Radiation at Planetary Boundary of K2-201 c : 36288.42 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-201)



  • Kopparapu Recent Venus for Star K2-201 distance : 0.609 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-201 distance : 0.771 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-201 distance : 0.745 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-201 distance : 0.817 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-201 distance : 1.372 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-201 distance : 1.447 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-201)



  • Original Kopparapu Recent Venus for Star K2-201 distance : 0.607 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-201 distance : 0.793 AU
  • Original Kopparapu Moist Greenhouse for Star K2-201 distance : 0.803 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-201 distance : 1.396 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-201 distance : 1.452 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-201)



    (Position in Stellar Map of star K2-201 and its Exoplanet K2-201 c)



    (Zoomed position in Stellar Map of star K2-201 and its Exoplanet K2-201 c (zoom level 3))

    (Synthetic Spectrum of star K2-201*)
    *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