Imaginary Picture of K2-246 b

Display orbital revolution of K2-246 b around the hoststar K2-246
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Exoplanet Name : K2-246 b
Alternate Name : "2MASS J12063112-0109379 b, EPIC 201386739 b, EPIC 201386739.01, WISE J120631.10-010938.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.3110 (Rjup) 3.4860 (Rearth)
Mass (Mjup / Me): 0.0265 (Mjup) 8.4271 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0602 (AU) 0.0602 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0158
Orbital Period(Observed/Estimated) 5.77 (Days Obs.) 5.78 (Days Est.)
Surface Gravity (G Earth) 0.6935
Star Radiation at Atmospheric Boundary: 296154.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1041.2 (K)
Blackbody T 0.3(K) 977.8 (K)
Blackbody T 0.7(K) 791.1 (K)
Tidally Locked Blackbody T 0.1(K) 1238.2 (K)
Tidally Locked Blackbody T 0.3(K) 1162.8 (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 : K2-246
Alternate Name : "2MASS J12063112-0109379, EPIC 201386739, WISE J120631.10-010938.0"
Star Distance(LY) : 2437.8
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5610 (K)
Spectral type : G6
UV portion[%]: 7.3
Visible portion[%]: 43.9
IR portion[%]: 48.8
Metalicity : -0.2
Absolute Magnitude: 3.8
Apparent Magnitude: 13.2
Right Ascension(RA) 181.6297
Declination (DEC) -1.1606
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=K2-246+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-246 b
K2-246 b

  • K2-246 b is an exoplanet orbiting the star K2-246, located about 2437.8 light-years (747.4 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-246 has apparent magnitude of 13.2, with absolute magnitude of 3.8.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5610 with its spectral types of G6
  • In this planetary system, the extrasolar planet K2-246 b orbits around the star K2-246 every 5.8 days with its orbital distance of 0.06 AU ( 9005791.8 km)
  • (Projected orbit of K2-246 b around its host star K2-246)


  • The Star K2-246 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.641 AU ( 95876393.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.886 AU ( 132526231.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.350 AU ( 201940648.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.986 AU ( 297164510.3 km)
  • Radiation at Planetary Boundary of K2-246 b : 296154.94 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-246)



  • Kopparapu Recent Venus for Star K2-246 distance : 0.671 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-246 distance : 0.850 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-246 distance : 0.821 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-246 distance : 0.900 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-246 distance : 1.507 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-246 distance : 1.590 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-246)



  • Original Kopparapu Recent Venus for Star K2-246 distance : 0.670 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-246 distance : 0.874 AU
  • Original Kopparapu Moist Greenhouse for Star K2-246 distance : 0.886 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-246 distance : 1.534 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-246 distance : 1.595 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-246)



    (Position in Stellar Map of star K2-246 and its Exoplanet K2-246 b)



    (Zoomed position in Stellar Map of star K2-246 and its Exoplanet K2-246 b (zoom level 3))

    (Synthetic Spectrum of star K2-246*)
    *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