Imaginary Picture of K2-247 c

Display orbital revolution of K2-247 c around the hoststar K2-247
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Exoplanet Name : K2-247 c
Alternate Name : "2MASS J12353448-1004091 c, EPIC 228725791 c, EPIC 228725791.02, WISE J123534.44-100409.2 c"
Status : Confirmed
Radius (Rjup / Re): 0.1950 (Rjup) 2.1858 (Rearth)
Mass (Mjup / Me): 0.0172 (Mjup) 5.4594 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0615 (AU) 0.0615 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0178
Orbital Period(Observed/Estimated) 6.49 (Days Obs.) 6.48 (Days Est.)
Surface Gravity (G Earth) 1.1427
Star Radiation at Atmospheric Boundary: 73232.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 734.2 (K)
Blackbody T 0.3(K) 689.5 (K)
Blackbody T 0.7(K) 557.9 (K)
Tidally Locked Blackbody T 0.1(K) 873.1 (K)
Tidally Locked Blackbody T 0.3(K) 820.0 (K)
Size Class: sub-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 : K2-247
Alternate Name : "2MASS J12353448-1004091, EPIC 228725791, WISE J123534.44-100409.2"
Star Distance(LY) : 859.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4667 (K)
Spectral type : K4
UV portion[%]: 2.1
Visible portion[%]: 33.7
IR portion[%]: 64.2
Metalicity : -0.1
Absolute Magnitude: 5.3
Apparent Magnitude: 12.4
Right Ascension(RA) 188.8937
Declination (DEC) -10.0692
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=K2-247+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-247 c
K2-247 c

  • K2-247 c is an exoplanet orbiting the star K2-247, located about 859.5 light-years (263.5 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-247 has apparent magnitude of 12.4, with absolute magnitude of 5.3.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4667 with its spectral types of K4
  • In this planetary system, the extrasolar planet K2-247 c orbits around the star K2-247 every 6.5 days with its orbital distance of 0.06 AU ( 9200269.0 km)
  • (Projected orbit of K2-247 c around its host star K2-247)


  • The Star K2-247 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.326 AU ( 48706038.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.450 AU ( 67324473.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.686 AU ( 102587598.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.009 AU ( 150962144.9 km)
  • Radiation at Planetary Boundary of K2-247 c : 73232.52 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-247)



  • Kopparapu Recent Venus for Star K2-247 distance : 0.357 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-247 distance : 0.452 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-247 distance : 0.437 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-247 distance : 0.480 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-247 distance : 0.832 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-247 distance : 0.877 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-247)



  • Original Kopparapu Recent Venus for Star K2-247 distance : 0.353 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-247 distance : 0.467 AU
  • Original Kopparapu Moist Greenhouse for Star K2-247 distance : 0.467 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-247 distance : 0.845 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-247 distance : 0.879 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-247)



    (Position in Stellar Map of star K2-247 and its Exoplanet K2-247 c)



    (Zoomed position in Stellar Map of star K2-247 and its Exoplanet K2-247 c (zoom level 3))

    (Synthetic Spectrum of star K2-247*)
    *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