Imaginary Picture of KOI-6538 b

Display orbital revolution of KOI-6538 b around the hoststar 2MASS J19344243+4020026
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Exoplanet Name : KOI-6538 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1360 (Rjup) 1.5244 (Rearth)
Mass (Mjup / Me): 0.0142 (Mjup) 4.5162 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.5085 (AU) 0.5085 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.3555
Orbital Period(Observed/Estimated) 129.84 (Days Obs.) 130.18 (Days Est.)
Surface Gravity (G Earth) 1.9434
Star Radiation at Atmospheric Boundary: 7146.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 410.4 (K)
Blackbody T 0.3(K) 385.4 (K)
Blackbody T 0.7(K) 311.8 (K)
Tidally Locked Blackbody T 0.1(K) 488.0 (K)
Tidally Locked Blackbody T 0.3(K) 458.3 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : 2MASS J19344243+4020026
Alternate Name : 5193439
Star Distance(LY) : 5059.0
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6133 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.1
Absolute Magnitude: 3.4
Apparent Magnitude: 14.3
Right Ascension(RA) 293.6768
Declination (DEC) 40.3341
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=2MASS+J19344243%2B4020026&submit=SIMBAD+search
Open Exoplanet Database Link
KOI-6538 b
KOI-6538 b

  • KOI-6538 b is an exoplanet orbiting the star 2MASS J19344243+4020026, located about 5059.0 light-years (1551.1 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star 2MASS J19344243+4020026 has apparent magnitude of 14.3, with absolute magnitude of 3.4.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 6133 with its spectral types of G0
  • In this planetary system, the extrasolar planet KOI-6538 b orbits around the star 2MASS J19344243+4020026 every 129.8 days with its orbital distance of 0.51 AU ( 76070517.3 km)
  • (Projected orbit of KOI-6538 b around its host star 2MASS J19344243+4020026)


  • The Star 2MASS J19344243+4020026 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.841 AU ( 125800897.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.162 AU ( 173889715.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.771 AU ( 264969445.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.606 AU ( 389914146.4 km)
  • Radiation at Planetary Boundary of KOI-6538 b : 7146.18 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 2MASS J19344243+4020026)



  • Kopparapu Recent Venus for Star 2MASS J19344243+4020026 distance : 0.853 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 2MASS J19344243+4020026 distance : 1.080 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 2MASS J19344243+4020026 distance : 1.043 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 2MASS J19344243+4020026 distance : 1.143 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 2MASS J19344243+4020026 distance : 1.892 AU
  • Kopparapu Outer Boundary for Early Mars for Star 2MASS J19344243+4020026 distance : 1.995 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 2MASS J19344243+4020026)



  • Original Kopparapu Recent Venus for Star 2MASS J19344243+4020026 distance : 0.860 AU
  • Original Kopparapu Runaway Greenhouse for Star 2MASS J19344243+4020026 distance : 1.109 AU
  • Original Kopparapu Moist Greenhouse for Star 2MASS J19344243+4020026 distance : 1.139 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 2MASS J19344243+4020026 distance : 1.925 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 2MASS J19344243+4020026 distance : 2.002 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 2MASS J19344243+4020026)



    (Position in Stellar Map of star 2MASS J19344243+4020026 and its Exoplanet KOI-6538 b)



    (Zoomed position in Stellar Map of star 2MASS J19344243+4020026 and its Exoplanet KOI-6538 b (zoom level 3))

    (Synthetic Spectrum of star 2MASS J19344243+4020026*)
    *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