Imaginary Picture of KOI-6921 b

Display orbital revolution of KOI-6921 b around the hoststar 2MASS J19200188+4330076
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Exoplanet Name : KOI-6921 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1100 (Rjup) 1.2330 (Rearth)
Mass (Mjup / Me): 0.0065 (Mjup) 2.0811 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0727 (AU) 0.0727 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0188
Orbital Period(Observed/Estimated) 6.88 (Days Obs.) 6.90 (Days Est.)
Surface Gravity (G Earth) 1.3689
Star Radiation at Atmospheric Boundary: 440329.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1149.7 (K)
Blackbody T 0.3(K) 1079.7 (K)
Blackbody T 0.7(K) 873.6 (K)
Tidally Locked Blackbody T 0.1(K) 1367.2 (K)
Tidally Locked Blackbody T 0.3(K) 1284.0 (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 J19200188+4330076
Alternate Name : 7816935
Star Distance(LY) : 4447.8
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6276 (K)
Spectral type : F8
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.1
Absolute Magnitude: 4.2
Apparent Magnitude: 14.9
Right Ascension(RA) 290.0078
Declination (DEC) 43.5021
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+J19200188%2B4330076&submit=SIMBAD+search
Open Exoplanet Database Link
KOI-6921 b
KOI-6921 b

  • KOI-6921 b is an exoplanet orbiting the star 2MASS J19200188+4330076, located about 4447.8 light-years (1363.7 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star 2MASS J19200188+4330076 has apparent magnitude of 14.9, with absolute magnitude of 4.2.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 6276 with its spectral types of F8
  • In this planetary system, the extrasolar planet KOI-6921 b orbits around the star 2MASS J19200188+4330076 every 6.9 days with its orbital distance of 0.07 AU ( 10875765.2 km)
  • (Projected orbit of KOI-6921 b around its host star 2MASS J19200188+4330076)


  • The Star 2MASS J19200188+4330076 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.944 AU ( 141181928.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.304 AU ( 195150320.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.988 AU ( 297365901.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.925 AU ( 437586950.4 km)
  • Radiation at Planetary Boundary of KOI-6921 b : 440329.70 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 2MASS J19200188+4330076)



  • Kopparapu Recent Venus for Star 2MASS J19200188+4330076 distance : 0.949 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 2MASS J19200188+4330076 distance : 1.202 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 2MASS J19200188+4330076 distance : 1.161 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 2MASS J19200188+4330076 distance : 1.272 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 2MASS J19200188+4330076 distance : 2.099 AU
  • Kopparapu Outer Boundary for Early Mars for Star 2MASS J19200188+4330076 distance : 2.213 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 2MASS J19200188+4330076)



  • Original Kopparapu Recent Venus for Star 2MASS J19200188+4330076 distance : 0.960 AU
  • Original Kopparapu Runaway Greenhouse for Star 2MASS J19200188+4330076 distance : 1.233 AU
  • Original Kopparapu Moist Greenhouse for Star 2MASS J19200188+4330076 distance : 1.271 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 2MASS J19200188+4330076 distance : 2.136 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 2MASS J19200188+4330076 distance : 2.222 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 2MASS J19200188+4330076)



    (Position in Stellar Map of star 2MASS J19200188+4330076 and its Exoplanet KOI-6921 b)



    (Zoomed position in Stellar Map of star 2MASS J19200188+4330076 and its Exoplanet KOI-6921 b (zoom level 3))

    (Synthetic Spectrum of star 2MASS J19200188+4330076*)
    *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