Imaginary Picture of K2-197 b

Display orbital revolution of K2-197 b around the hoststar K2-197
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Exoplanet Name : K2-197 b
Alternate Name : "2MASS J13293447-0722262 b, EPIC 212735333 b, EPIC 212735333.01, WISE J132934.44-072226.3 b"
Status : Confirmed
Radius (Rjup / Re): 0.2280 (Rjup) 2.5557 (Rearth)
Mass (Mjup / Me): 0.0199 (Mjup) 6.3138 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0806 (AU) 0.0806 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0229
Orbital Period(Observed/Estimated) 8.36 (Days Obs.) 8.36 (Days Est.)
Surface Gravity (G Earth) 0.9667
Star Radiation at Atmospheric Boundary: 168388.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 904.1 (K)
Blackbody T 0.3(K) 849.1 (K)
Blackbody T 0.7(K) 687.0 (K)
Tidally Locked Blackbody T 0.1(K) 1075.2 (K)
Tidally Locked Blackbody T 0.3(K) 1009.7 (K)
Size Class: sub-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 : K2-197
Alternate Name : "2MASS J13293447-0722262, EPIC 212735333, WISE J132934.44-072226.3"
Star Distance(LY) : 813.1
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5667 (K)
Spectral type : G5
UV portion[%]: 7.5
Visible portion[%]: 44.2
IR portion[%]: 48.2
Metalicity : 0.1
Absolute Magnitude: 3.9
Apparent Magnitude: 10.9
Right Ascension(RA) 202.3937
Declination (DEC) -7.3740
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=K2-197+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-197 b
K2-197 b

  • K2-197 b is an exoplanet orbiting the star K2-197, located about 813.1 light-years (249.3 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-197 has apparent magnitude of 10.9, with absolute magnitude of 3.9.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5667 with its spectral types of G5
  • In this planetary system, the extrasolar planet K2-197 b orbits around the star K2-197 every 8.4 days with its orbital distance of 0.08 AU ( 12057588.4 km)
  • (Projected orbit of K2-197 b around its host star K2-197)


  • The Star K2-197 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.647 AU ( 96793788.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.894 AU ( 133794310.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.363 AU ( 203872920.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.005 AU ( 300007933.3 km)
  • Radiation at Planetary Boundary of K2-197 b : 168388.91 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-197)



  • Kopparapu Recent Venus for Star K2-197 distance : 0.675 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-197 distance : 0.855 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-197 distance : 0.826 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-197 distance : 0.905 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-197 distance : 1.514 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-197 distance : 1.597 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-197)



  • Original Kopparapu Recent Venus for Star K2-197 distance : 0.674 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-197 distance : 0.879 AU
  • Original Kopparapu Moist Greenhouse for Star K2-197 distance : 0.892 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-197 distance : 1.541 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-197 distance : 1.602 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-197)



    (Position in Stellar Map of star K2-197 and its Exoplanet K2-197 b)



    (Zoomed position in Stellar Map of star K2-197 and its Exoplanet K2-197 b (zoom level 3))

    (Synthetic Spectrum of star K2-197*)
    *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