Imaginary Picture of K2-303 b

Display orbital revolution of K2-303 b around the hoststar EPIC 206317286
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Exoplanet Name : K2-303 b
Alternate Name : "2MASS J22302822-0758205 b, WISE J223028.26-075820.8 b, EPIC 206317286 b"
Status : Confirmed
Radius (Rjup / Re): 0.0860 (Rjup) 0.9640 (Rearth)
Mass (Mjup / Me): 0.0027 (Mjup) 0.8584 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0237 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0043
Orbital Period(Observed/Estimated) 1.58 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.9237
Star Radiation at Atmospheric Boundary: 98606.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 790.9 (K)
Blackbody T 0.3(K) 742.7 (K)
Blackbody T 0.7(K) 601.0 (K)
Tidally Locked Blackbody T 0.1(K) 940.5 (K)
Tidally Locked Blackbody T 0.3(K) 883.3 (K)
Size Class: Earth-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 : EPIC 206317286
Alternate Name : "2MASS J22302822-0758205, K2-303, WISE J223028.26-075820.8"
Star Distance(LY) : 1034.6
Stellar Radius(Rsun) : 0.6 (Rsun Estimated)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3300 (K)
Spectral type : M9
UV portion[%]: 0.2
Visible portion[%]: 11.2
IR portion[%]: 88.6
Metalicity : 0.0
Absolute Magnitude: 4.8
Apparent Magnitude: 12.3
Right Ascension(RA) 337.6176
Declination (DEC) -7.9724
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=EPIC+206317286&submit=SIMBAD+search
Open Exoplanet Database Link
K2-303 b
K2-303 b

  • K2-303 b is an exoplanet orbiting the star EPIC 206317286, located about 1034.6 light-years (317.2 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star EPIC 206317286 has apparent magnitude of 12.3, with absolute magnitude of 4.8.
  • It is 0.7 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • In this planetary system, the extrasolar planet K2-303 b orbits around the star EPIC 206317286 every 1.6 days with its orbital distance of 0.02 AU ( 3546915.6 km)
  • (Projected orbit of K2-303 b around its host star EPIC 206317286)


  • The Star EPIC 206317286 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.146 AU ( 21788787.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.201 AU ( 30117798.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.307 AU ( 45892859.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.451 AU ( 67533352.6 km)
  • Radiation at Planetary Boundary of K2-303 b : 98606.11 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star EPIC 206317286)



  • Kopparapu Recent Venus for Star EPIC 206317286 distance : 0.165 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star EPIC 206317286 distance : 0.209 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star EPIC 206317286 distance : 0.202 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star EPIC 206317286 distance : 0.222 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star EPIC 206317286 distance : 0.410 AU
  • Kopparapu Outer Boundary for Early Mars for Star EPIC 206317286 distance : 0.433 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star EPIC 206317286)



  • Original Kopparapu Recent Venus for Star EPIC 206317286 distance : 0.164 AU
  • Original Kopparapu Runaway Greenhouse for Star EPIC 206317286 distance : 0.216 AU
  • Original Kopparapu Moist Greenhouse for Star EPIC 206317286 distance : 0.217 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star EPIC 206317286 distance : 0.417 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star EPIC 206317286 distance : 0.433 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star EPIC 206317286)



    (Position in Stellar Map of star EPIC 206317286 and its Exoplanet K2-303 b)



    (Zoomed position in Stellar Map of star EPIC 206317286 and its Exoplanet K2-303 b (zoom level 3))

    (Synthetic Spectrum of star EPIC 206317286*)
    *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