Imaginary Picture of Kepler-209 b

Display orbital revolution of Kepler-209 b around the hoststar Kepler-209
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Exoplanet Name : Kepler-209 b
Alternate Name : "2MASS J19244068+4238269 b, K00672.01, KIC 7115785 b, KOI-672 b, KOI-672.01, WISE J192440.67+423826.7 b"
Status : Confirmed
Radius (Rjup / Re): 0.2020 (Rjup) 2.2642 (Rearth)
Mass (Mjup / Me): 0.0177 (Mjup) 5.6414 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1220 (AU) 0.1220 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0440
Orbital Period(Observed/Estimated) 16.09 (Days Obs.) 23.20 (Days Est.)
Surface Gravity (G Earth) 1.1004
Star Radiation at Atmospheric Boundary: 65103.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 712.9 (K)
Blackbody T 0.3(K) 669.5 (K)
Blackbody T 0.7(K) 541.7 (K)
Tidally Locked Blackbody T 0.1(K) 847.8 (K)
Tidally Locked Blackbody T 0.3(K) 796.2 (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 : Kepler-209
Alternate Name : "2MASS J19244068+4238269, KIC 7115785, KOI-672, WISE J192440.67+423826.7"
Star Distance(LY) : 1881.0
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5564 (K)
Spectral type : G7
UV portion[%]: 6.9
Visible portion[%]: 43.3
IR portion[%]: 49.7
Metalicity : 0.0
Absolute Magnitude: 4.0
Apparent Magnitude: 12.8
Right Ascension(RA) 291.1695
Declination (DEC) 42.6408
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-209+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-209%20b/
Kepler-209 b
Kepler-209 b

  • Kepler-209 b is an exoplanet orbiting the star Kepler-209, located about 1881.0 light-years (576.7 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-209 has apparent magnitude of 12.8, with absolute magnitude of 4.0.
  • It is 0.5 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5564 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-209 b orbits around the star Kepler-209 every 16.1 days with its orbital distance of 0.12 AU ( 18250940.2 km)
  • (Projected orbit of Kepler-209 b around its host star Kepler-209)


  • The Star Kepler-209 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.609 AU ( 91099963.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.842 AU ( 125923957.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.283 AU ( 191880243.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.887 AU ( 282360184.2 km)
  • Radiation at Planetary Boundary of Kepler-209 b : 65103.65 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-209)



  • Kopparapu Recent Venus for Star Kepler-209 distance : 0.639 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-209 distance : 0.809 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-209 distance : 0.782 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-209 distance : 0.857 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-209 distance : 1.438 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-209 distance : 1.517 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-209)



  • Original Kopparapu Recent Venus for Star Kepler-209 distance : 0.637 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-209 distance : 0.832 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-209 distance : 0.843 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-209 distance : 1.463 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-209 distance : 1.522 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-209)



    (Position in Stellar Map of star Kepler-209 and its Exoplanet Kepler-209 b)



    (Zoomed position in Stellar Map of star Kepler-209 and its Exoplanet Kepler-209 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-209*)
    *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