Imaginary Picture of K2-9 b
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Exoplanet Name : K2-9 b
Alternate Name : EPIC 201465501 b
Radius (Rjup / Re): 0.1430 (Rjup) 1.6029 (Rearth)
Mass (Mjup / Me): 0.0129 (Mjup) 4.0914 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0848 (AU) 0.0848 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0505
Orbital Period(Observed/Estimated) 18.45 (Days Obs.) 18.41 (Days Est.)
Star Radiation at Atmospheric Boundary: 1541.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 279.7 (K)
Blackbody T 0.3(K) 262.6 (K)
Blackbody T 0.7(K) 212.5 (K)
Tidally Locked Blackbody T 0.1(K) 332.6 (K)
Tidally Locked Blackbody T 0.3(K) 312.3 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Habitable
Star Name : K2-9
Alternate Name : EPIC 201465501
Star Distance(LY) : 215.3
Stellar Radius(Rsun) : 0.2 (Rsun Measured)
Stellar Mass(Msun) : 0.2 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3468 (K)
Spectral type : M4
Metalicity : -0.5
Absolute Magnitude: 17.9
Apparent Magnitude: 22.0
Right Ascension(RA) 176.2645
Declination (DEC) 0.1012
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-9+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-9 b
K2-9 b

  • K2-9 b is an exoplanet orbiting the star K2-9, located about 215.3 light-years (66.0 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star K2-9 has apparent magnitude of 22.0, with absolute magnitude of 17.9.
  • It is 0.2 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3468 with its spectral types of M4
  • In this planetary system, the extrasolar planet K2-9 b orbits around the star K2-9 every 18.4 days with its orbital distance of 0.08 AU ( 12685899.4 km)
  • (Projected orbit of K2-9 b around its host star K2-9)


  • The Star K2-9 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.065 AU ( 9744426.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.090 AU ( 13469344.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.137 AU ( 20524300.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.202 AU ( 30202406.7 km)
  • Radiation at Planetary Boundary of K2-9 b : 1541.73 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-9)



  • Kopparapu Recent Venus for Star K2-9 distance : 0.074 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-9 distance : 0.093 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-9 distance : 0.090 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-9 distance : 0.099 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-9 distance : 0.182 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-9 distance : 0.192 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-9)



  • Original Kopparapu Recent Venus for Star K2-9 distance : 0.073 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-9 distance : 0.096 AU
  • Original Kopparapu Moist Greenhouse for Star K2-9 distance : 0.097 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-9 distance : 0.184 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-9 distance : 0.192 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-9)



    (Position in Stellar Map of star K2-9 and its Exoplanet K2-9 b)



    (Zoomed position in Stellar Map of star K2-9 and its Exoplanet K2-9 b (zoom level 3))