Imaginary Picture of K2-199 b

Display orbital revolution of K2-199 b around the hoststar K2-199
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Exoplanet Name : K2-199 b
Alternate Name : "2MASS J13553641-0608100 b, EPIC 212779596 b, EPIC 212779596.01, WISE J135536.36-060809.9 b"
Status : Confirmed
Radius (Rjup / Re): 0.1543 (Rjup) 1.7295 (Rearth)
Mass (Mjup / Me): 0.0217 (Mjup) 6.8993 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0382 (AU) 0.0382 (AU Est.)
Eccentricity : 0.0200
Orbital Period(Yrs) 0.0088
Orbital Period(Observed/Estimated) 3.23 (Days Obs.) 3.19 (Days Est.)
Surface Gravity (G Earth) 2.3064
Star Radiation at Atmospheric Boundary: 181367.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 921.0 (K)
Blackbody T 0.3(K) 865.0 (K)
Blackbody T 0.7(K) 699.8 (K)
Tidally Locked Blackbody T 0.1(K) 1095.3 (K)
Tidally Locked Blackbody T 0.3(K) 1028.6 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-199
Alternate Name : "2MASS J13553641-0608100, EPIC 212779596, WISE J135536.36-060809.9"
Star Distance(LY) : 352.2
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4648 (K)
Spectral type : K4
UV portion[%]: 2.0
Visible portion[%]: 33.4
IR portion[%]: 64.5
Metalicity : -0.1
Absolute Magnitude: 5.1
Apparent Magnitude: 10.3
Right Ascension(RA) 208.9017
Declination (DEC) -6.1361
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=K2-199&submit=SIMBAD+search
Open Exoplanet Database Link
K2-199 b
K2-199 b

  • K2-199 b is an exoplanet orbiting the star K2-199, located about 352.2 light-years (108.0 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-199 has apparent magnitude of 10.3, with absolute magnitude of 5.1.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4648 with its spectral types of K4
  • In this planetary system, the extrasolar planet K2-199 b orbits around the star K2-199 every 3.2 days with its orbital distance of 0.04 AU ( 5714638.7 km)
  • (Projected orbit of K2-199 b around its host star K2-199)


  • The Star K2-199 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.318 AU ( 47610118.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.440 AU ( 65809626.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.670 AU ( 100279306.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.986 AU ( 147565392.3 km)
  • Radiation at Planetary Boundary of K2-199 b : 181367.88 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-199)



  • Kopparapu Recent Venus for Star K2-199 distance : 0.350 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-199 distance : 0.443 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-199 distance : 0.427 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-199 distance : 0.469 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-199 distance : 0.814 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-199 distance : 0.859 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-199)



  • Original Kopparapu Recent Venus for Star K2-199 distance : 0.345 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-199 distance : 0.457 AU
  • Original Kopparapu Moist Greenhouse for Star K2-199 distance : 0.457 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-199 distance : 0.828 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-199 distance : 0.861 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-199)



    (Position in Stellar Map of star K2-199 and its Exoplanet K2-199 b)



    (Zoomed position in Stellar Map of star K2-199 and its Exoplanet K2-199 b (zoom level 3))

    (Synthetic Spectrum of star K2-199*)
    *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