Imaginary Picture of K2-117 b

Display orbital revolution of K2-117 b around the hoststar K2-117
/
Exoplanet Name : K2-117 b
Alternate Name : "K2-117 b, 2MASS J08552535+1028087 b, EPIC 211331236 b, EPIC 211331236.01, WISE J085525.36+102809.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.1810 (Rjup) 2.0288 (Rearth)
Mass (Mjup / Me): 0.0160 (Mjup) 5.0939 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0189 (AU) 0.0189 (AU Est.)
Eccentricity : 0.0600
Orbital Period(Yrs) 0.0035
Orbital Period(Observed/Estimated) 1.29 (Days Obs.) 1.29 (Days Est.)
Surface Gravity (G Earth) 1.2375
Star Radiation at Atmospheric Boundary: 181915.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 921.7 (K)
Blackbody T 0.3(K) 865.6 (K)
Blackbody T 0.7(K) 700.4 (K)
Tidally Locked Blackbody T 0.1(K) 1096.1 (K)
Tidally Locked Blackbody T 0.3(K) 1029.4 (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 : K2-117
Alternate Name : "2MASS J08552535+1028087, K2-117, EPIC 211331236, WISE J085525.36+102809.0"
Star Distance(LY) : 333.5
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3778 (K)
Spectral type : M1.0 V
UV portion[%]: 0.4
Visible portion[%]: 19.2
IR portion[%]: 80.3
Metalicity : -0.1
Absolute Magnitude: 6.4
Apparent Magnitude: 11.4
Right Ascension(RA) 133.8557
Declination (DEC) 10.4691
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+211331236+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-117 b
K2-117 b

  • K2-117 b is an exoplanet orbiting the star K2-117, located about 333.5 light-years (102.2 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star K2-117 has apparent magnitude of 11.4, with absolute magnitude of 6.4.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3778 with its spectral types of M1.0 V
  • In this planetary system, the extrasolar planet K2-117 b orbits around the star K2-117 every 1.3 days with its orbital distance of 0.02 AU ( 2827399.8 km)
  • (Projected orbit of K2-117 b around its host star K2-117)


  • The Star K2-117 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.158 AU ( 23591317.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.218 AU ( 32609365.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.332 AU ( 49689457.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.489 AU ( 73120213.1 km)
  • Radiation at Planetary Boundary of K2-117 b : 181915.36 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-117)



  • Kopparapu Recent Venus for Star K2-117 distance : 0.177 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-117 distance : 0.225 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-117 distance : 0.217 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-117 distance : 0.238 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-117 distance : 0.431 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-117 distance : 0.455 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-117)



  • Original Kopparapu Recent Venus for Star K2-117 distance : 0.176 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-117 distance : 0.232 AU
  • Original Kopparapu Moist Greenhouse for Star K2-117 distance : 0.232 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-117 distance : 0.438 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-117 distance : 0.455 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-117)



    (Position in Stellar Map of star K2-117 and its Exoplanet K2-117 b)



    (Zoomed position in Stellar Map of star K2-117 and its Exoplanet K2-117 b (zoom level 3))

    (Synthetic Spectrum of star K2-117*)
    *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