Imaginary Picture of K2-166 c

Display orbital revolution of K2-166 c around the hoststar K2-166
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Exoplanet Name : K2-166 c
Alternate Name : "2MASS J12204519+0216568 c, EPIC 201615463.02, WISE J122045.15+021656.6 c, EPIC 201615463 c"
Status : Confirmed
Radius (Rjup / Re): 0.1090 (Rjup) 1.2218 (Rearth)
Mass (Mjup / Me): 0.0063 (Mjup) 2.0133 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0488 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0104
Orbital Period(Observed/Estimated) 3.80 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.3487
Star Radiation at Atmospheric Boundary: 67025.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 718.1 (K)
Blackbody T 0.3(K) 674.4 (K)
Blackbody T 0.7(K) 545.7 (K)
Tidally Locked Blackbody T 0.1(K) 854.0 (K)
Tidally Locked Blackbody T 0.3(K) 802.0 (K)
Size Class: super-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 : K2-166
Alternate Name : "2MASS J12204519+0216568, EPIC 201615463, WISE J122045.15+021656.6"
Star Distance(LY) : 1568.8
Stellar Radius(Rsun) : 1.0 (Rsun Estimated)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (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: 2.5
Apparent Magnitude: 11.0
Right Ascension(RA) 185.1883
Declination (DEC) 2.2824
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-166&submit=SIMBAD+search
Open Exoplanet Database Link
K2-166 c
K2-166 c

  • K2-166 c is an exoplanet orbiting the star K2-166, located about 1568.8 light-years (481.0 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star K2-166 has apparent magnitude of 11.0, with absolute magnitude of 2.5.
  • It is 1.1 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 3300 with its spectral types of M9
  • In this planetary system, the extrasolar planet K2-166 c orbits around the star K2-166 every 3.8 days with its orbital distance of 0.05 AU ( 7297972.7 km)
  • (Projected orbit of K2-166 c around its host star K2-166)


  • The Star K2-166 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.247 AU ( 36961705.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.342 AU ( 51090736.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.520 AU ( 77850975.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.766 AU ( 114561121.1 km)
  • Radiation at Planetary Boundary of K2-166 c : 67025.33 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-166)



  • Kopparapu Recent Venus for Star K2-166 distance : 0.280 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-166 distance : 0.354 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-166 distance : 0.342 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-166 distance : 0.376 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-166 distance : 0.696 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-166 distance : 0.734 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-166)



  • Original Kopparapu Recent Venus for Star K2-166 distance : 0.278 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-166 distance : 0.367 AU
  • Original Kopparapu Moist Greenhouse for Star K2-166 distance : 0.368 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-166 distance : 0.707 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-166 distance : 0.735 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-166)



    (Position in Stellar Map of star K2-166 and its Exoplanet K2-166 c)



    (Zoomed position in Stellar Map of star K2-166 and its Exoplanet K2-166 c (zoom level 3))

    (Synthetic Spectrum of star K2-166*)
    *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