Imaginary Picture of K2-5 b
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Exoplanet Name : K2-5 b
Alternate Name : EPIC 201338508 b
Radius (Rjup / Re): 0.1710 (Rjup) 1.9167 (Rearth)
Mass (Mjup / Me): 0.0152 (Mjup) 4.8317 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0509 (AU) 0.0509 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0157
Orbital Period(Observed/Estimated) 5.73 (Days Obs.) 5.76 (Days Est.)
Star Radiation at Atmospheric Boundary: 36237.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 615.8 (K)
Blackbody T 0.3(K) 578.3 (K)
Blackbody T 0.7(K) 467.9 (K)
Tidally Locked Blackbody T 0.1(K) 732.3 (K)
Tidally Locked Blackbody T 0.3(K) 687.7 (K)
Size Class: sub-Neptune-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 : K2-5
Alternate Name : EPIC 201338508
Star Distance(LY) : 590.3
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4102 (K)
Spectral type : K6
Metalicity : -0.5
Absolute Magnitude: 15.7
Apparent Magnitude: 22.0
Right Ascension(RA) 169.3035
Declination (DEC) -1.8780
Hubble Space Telescope Guide Star Catalog (GSC) ID
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=K2-5+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-5 b
K2-5 b

  • K2-5 b is an exoplanet orbiting the star K2-5, located about 590.3 light-years (181.0 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star K2-5 has apparent magnitude of 22.0, with absolute magnitude of 15.7.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 4102 with its spectral types of K6
  • In this planetary system, the extrasolar planet K2-5 b orbits around the star K2-5 every 5.7 days with its orbital distance of 0.05 AU ( 7614531.6 km)
  • (Projected orbit of K2-5 b around its host star K2-5)


  • The Star K2-5 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.190 AU ( 28356509.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.262 AU ( 39196106.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.399 AU ( 59726191.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.588 AU ( 87889707.9 km)
  • Radiation at Planetary Boundary of K2-5 b : 36237.53 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-5)



  • Kopparapu Recent Venus for Star K2-5 distance : 0.212 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-5 distance : 0.268 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-5 distance : 0.259 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-5 distance : 0.285 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-5 distance : 0.506 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-5 distance : 0.534 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-5)



  • Original Kopparapu Recent Venus for Star K2-5 distance : 0.209 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-5 distance : 0.277 AU
  • Original Kopparapu Moist Greenhouse for Star K2-5 distance : 0.277 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-5 distance : 0.514 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-5 distance : 0.535 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-5)



    (Position in Stellar Map of star K2-5 and its Exoplanet K2-5 b)



    (Zoomed position in Stellar Map of star K2-5 and its Exoplanet K2-5 b (zoom level 3))