Imaginary Picture of K2-72 c

Display orbital revolution of K2-72 c around the hoststar K2-72
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Exoplanet Name : K2-72 c
Alternate Name : EPIC 206209135.02
Status : Confirmed
Radius (Rjup / Re): 0.1030 (Rjup) 1.1545 (Rearth)
Mass (Mjup / Me): 0.0052 (Mjup) 1.6403 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0780 (AU) 0.0780 (AU Est.)
Eccentricity : 0.1100
Orbital Period(Yrs) 0.0416
Orbital Period(Observed/Estimated) 15.19 (Days Obs.) 15.31 (Days Est.)
Surface Gravity (G Earth) 1.2306
Star Radiation at Atmospheric Boundary: 2797.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 324.6 (K)
Blackbody T 0.3(K) 304.8 (K)
Blackbody T 0.7(K) 246.6 (K)
Tidally Locked Blackbody T 0.1(K) 386.0 (K)
Tidally Locked Blackbody T 0.3(K) 362.5 (K)
Size Class: Earth-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 : K2-72
Alternate Name : "2MASS J22182923-0936444, EPIC 206209135"
Star Distance(LY) : 216.9
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3360 (K)
Spectral type : M5
UV portion[%]: 0.2
Visible portion[%]: 12.3
IR portion[%]: 87.4
Metalicity : 0.0
Absolute Magnitude: 7.6
Apparent Magnitude: 11.7
Right Ascension(RA) 334.6219
Declination (DEC) -9.6124
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=K2-72+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-72 c
K2-72 c

  • K2-72 c is an exoplanet orbiting the star K2-72, located about 216.9 light-years (66.5 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-72 has apparent magnitude of 11.7, with absolute magnitude of 7.6.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3360 with its spectral types of M5
  • In this planetary system, the extrasolar planet K2-72 c orbits around the star K2-72 every 15.2 days with its orbital distance of 0.08 AU ( 11668633.9 km)
  • (Projected orbit of K2-72 c around its host star K2-72)


  • The Star K2-72 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.081 AU ( 12073984.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.112 AU ( 16689401.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.170 AU ( 25430954.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.250 AU ( 37422763.9 km)
  • Radiation at Planetary Boundary of K2-72 c : 2797.70 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-72)



  • Kopparapu Recent Venus for Star K2-72 distance : 0.091 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-72 distance : 0.116 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-72 distance : 0.112 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-72 distance : 0.123 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-72 distance : 0.226 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-72 distance : 0.239 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-72)



  • Original Kopparapu Recent Venus for Star K2-72 distance : 0.091 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-72 distance : 0.120 AU
  • Original Kopparapu Moist Greenhouse for Star K2-72 distance : 0.120 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-72 distance : 0.230 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-72 distance : 0.239 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-72)



    (Position in Stellar Map of star K2-72 and its Exoplanet K2-72 c)



    (Zoomed position in Stellar Map of star K2-72 and its Exoplanet K2-72 c (zoom level 3))

    (Synthetic Spectrum of star K2-72*)
    *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