Imaginary Picture of K2-186 b

Display orbital revolution of K2-186 b around the hoststar K2-186
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Exoplanet Name : K2-186 b
Alternate Name : "2MASS J09012038+1849316 b, EPIC 211906650 b, EPIC 211906650.01, WISE J090120.41+184931.2 b"
Status : Confirmed
Radius (Rjup / Re): 0.2830 (Rjup) 3.1721 (Rearth)
Mass (Mjup / Me): 0.0243 (Mjup) 7.7192 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.2360 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.1135
Orbital Period(Observed/Estimated) 41.47 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.7671
Star Radiation at Atmospheric Boundary: 23658.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 553.5 (K)
Blackbody T 0.3(K) 519.8 (K)
Blackbody T 0.7(K) 420.6 (K)
Tidally Locked Blackbody T 0.1(K) 658.3 (K)
Tidally Locked Blackbody T 0.3(K) 618.2 (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 : K2-186
Alternate Name : "2MASS J09012038+1849316, EPIC 211906650, WISE J090120.41+184931.2"
Star Distance(LY) : 1118.3
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5784 (K)
Spectral type : G2
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.1
Absolute Magnitude: 3.5
Apparent Magnitude: 11.1
Right Ascension(RA) 135.3350
Declination (DEC) 18.8255
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=K2-186+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-186 b
K2-186 b

  • K2-186 b is an exoplanet orbiting the star K2-186, located about 1118.3 light-years (342.9 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-186 has apparent magnitude of 11.1, with absolute magnitude of 3.5.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5784 with its spectral types of G2
  • In this planetary system, the extrasolar planet K2-186 b orbits around the star K2-186 every 41.5 days with its orbital distance of 0.24 AU ( 35311605.5 km)
  • (Projected orbit of K2-186 b around its host star K2-186)


  • The Star K2-186 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.710 AU ( 106252891.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.982 AU ( 146869263.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.496 AU ( 223796254.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.201 AU ( 329325992.7 km)
  • Radiation at Planetary Boundary of K2-186 b : 23658.43 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-186)



  • Kopparapu Recent Venus for Star K2-186 distance : 0.736 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-186 distance : 0.932 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-186 distance : 0.900 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-186 distance : 0.987 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-186 distance : 1.645 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-186 distance : 1.735 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-186)



  • Original Kopparapu Recent Venus for Star K2-186 distance : 0.737 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-186 distance : 0.958 AU
  • Original Kopparapu Moist Greenhouse for Star K2-186 distance : 0.975 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-186 distance : 1.674 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-186 distance : 1.741 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-186)



    (Position in Stellar Map of star K2-186 and its Exoplanet K2-186 b)



    (Zoomed position in Stellar Map of star K2-186 and its Exoplanet K2-186 b (zoom level 3))

    (Synthetic Spectrum of star K2-186*)
    *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