Imaginary Picture of K2-8 b
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Exoplanet Name : K2-8 b
Alternate Name :
Radius (Rjup / Re): 0.3190 (Rjup) 3.5757 (Rearth)
Mass (Mjup / Me): 0.0271 (Mjup) 8.6285 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0856 (AU) 0.0856 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0283
Orbital Period(Observed/Estimated) 10.35 (Days Obs.) 10.29 (Days Est.)
Star Radiation at Atmospheric Boundary: 52403.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 675.3 (K)
Blackbody T 0.3(K) 634.2 (K)
Blackbody T 0.7(K) 513.1 (K)
Tidally Locked Blackbody T 0.1(K) 803.0 (K)
Tidally Locked Blackbody T 0.3(K) 754.1 (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 : K2-8
Alternate Name : EPIC 201445392
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4890 (K)
Spectral type : K2
Metalicity : -0.0
Absolute Magnitude: 25.0
Apparent Magnitude: 14.4
Right Ascension(RA) 169.7937
Declination (DEC) -0.2844
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors "Benjamin T. Montet, Timothy D. Morton, Daniel Foreman-Mackey, John Asher Johnson, David W. Hogg, Brendan P. Bowler, David W. Latham, Allyson Bieryla, Andrew W. Mann, "
Discovery Paper - Title "STELLAR AND PLANETARY PROPERTIES OF K2 CAMPAIGN 1 CANDIDATES AND VALIDATION OF 18 SYSTEMS, INCLUDING A PLANET RECEIVING EARTH-LIKE INSOLATION "
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-8+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/EPIC%20201445392%20b/
K2-8 b
K2-8 b

  • K2-8 b is an exoplanet orbiting the star K2-8. Its discovery was publicly announced on 2015.
  • The host star K2-8 has apparent magnitude of 14.4, with absolute magnitude of 25.0.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4890 with its spectral types of K2
  • In this planetary system, the extrasolar planet K2-8 b orbits around the star K2-8 every 10.4 days with its orbital distance of 0.09 AU ( 12805577.7 km)
  • (Projected orbit of K2-8 b around its host star K2-8)


  • The Star K2-8 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.383 AU ( 57346583.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.530 AU ( 79267965.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.807 AU ( 120786836.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.188 AU ( 177743121.7 km)
  • Radiation at Planetary Boundary of K2-8 b : 52403.00 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-8)



  • Kopparapu Recent Venus for Star K2-8 distance : 0.417 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-8 distance : 0.528 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-8 distance : 0.510 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-8 distance : 0.559 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-8 distance : 0.961 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-8 distance : 1.013 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-8)



  • Original Kopparapu Recent Venus for Star K2-8 distance : 0.412 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-8 distance : 0.544 AU
  • Original Kopparapu Moist Greenhouse for Star K2-8 distance : 0.545 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-8 distance : 0.977 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-8 distance : 1.016 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-8)



    (Position in Stellar Map of star K2-8 and its Exoplanet K2-8 b)



    (Zoomed position in Stellar Map of star K2-8 and its Exoplanet K2-8 b (zoom level 3))