Imaginary Picture of K2-85 b

Display orbital revolution of K2-85 b around the hoststar K2-85
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Exoplanet Name : K2-85 b
Alternate Name : EPIC 210707130.01
Status : Confirmed
Radius (Rjup / Re): 0.0900 (Rjup) 1.0088 (Rearth)
Mass (Mjup / Me): 0.0032 (Mjup) 1.0098 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0126 (AU) 0.0126 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0019
Orbital Period(Observed/Estimated) 0.68 (Days Obs.) 0.69 (Days Est.)
Surface Gravity (G Earth) 0.9922
Star Radiation at Atmospheric Boundary: 663492.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1273.8 (K)
Blackbody T 0.3(K) 1196.2 (K)
Blackbody T 0.7(K) 967.9 (K)
Tidally Locked Blackbody T 0.1(K) 1514.8 (K)
Tidally Locked Blackbody T 0.3(K) 1422.6 (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 : K2-85
Alternate Name : "2MASS J03575144+1827551, EPIC 210707130, WISE J035751.52+182754.2"
Star Distance(LY) : 315.9
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4268 (K)
Spectral type : K6
UV portion[%]: 0.9
Visible portion[%]: 27.3
IR portion[%]: 71.8
Metalicity : 0.0
Absolute Magnitude: 5.3
Apparent Magnitude: 10.2
Right Ascension(RA) 59.4644
Declination (DEC) 18.4653
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=K2-85+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-85 b
K2-85 b

  • K2-85 b is an exoplanet orbiting the star K2-85, located about 315.9 light-years (96.8 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star K2-85 has apparent magnitude of 10.2, with absolute magnitude of 5.3.
  • It is 0.6 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 4268 with its spectral types of K6
  • In this planetary system, the extrasolar planet K2-85 b orbits around the star K2-85 every 0.7 days with its orbital distance of 0.01 AU ( 1889421.1 km)
  • (Projected orbit of K2-85 b around its host star K2-85)


  • The Star K2-85 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.201 AU ( 30107667.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.278 AU ( 41616664.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.424 AU ( 63414586.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.624 AU ( 93317342.6 km)
  • Radiation at Planetary Boundary of K2-85 b : 663492.63 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-85)



  • Kopparapu Recent Venus for Star K2-85 distance : 0.224 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-85 distance : 0.283 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-85 distance : 0.274 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-85 distance : 0.301 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-85 distance : 0.531 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-85 distance : 0.560 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-85)



  • Original Kopparapu Recent Venus for Star K2-85 distance : 0.221 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-85 distance : 0.293 AU
  • Original Kopparapu Moist Greenhouse for Star K2-85 distance : 0.292 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-85 distance : 0.539 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-85 distance : 0.561 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-85)



    (Position in Stellar Map of star K2-85 and its Exoplanet K2-85 b)



    (Zoomed position in Stellar Map of star K2-85 and its Exoplanet K2-85 b (zoom level 3))

    (Synthetic Spectrum of star K2-85*)
    *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