Imaginary Picture of Kepler-1805 b

Display orbital revolution of Kepler-1805 b around the hoststar Kepler-1805
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Exoplanet Name : Kepler-1805 b
Alternate Name : "KOI-2191 b, KOI-2191.01"
Status : Confirmed
Radius (Rjup / Re): 0.1378 (Rjup) 1.5450 (Rearth)
Mass (Mjup / Me): 0.0124 (Mjup) 3.9539 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0699 (AU) 0.0699 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0242
Orbital Period(Observed/Estimated) 8.85 (Days Obs.) 8.83 (Days Est.)
Surface Gravity (G Earth) 1.6563
Star Radiation at Atmospheric Boundary: 18511.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 520.6 (K)
Blackbody T 0.3(K) 488.9 (K)
Blackbody T 0.7(K) 395.6 (K)
Tidally Locked Blackbody T 0.1(K) 619.1 (K)
Tidally Locked Blackbody T 0.3(K) 581.4 (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 : Kepler-1805
Alternate Name : "5601258, KOI-2191"
Star Distance(LY) : 722.9
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 13.8 (GY)
Temperature : 3796 (K)
Spectral type : M1V
UV portion[%]: 0.3
Visible portion[%]: 13.7
IR portion[%]: 86.0
Metalicity : 0.1
Absolute Magnitude: 8.8
Apparent Magnitude: 15.5
Right Ascension(RA) 285.0865
Declination (DEC) 40.8990
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
Kepler-1805 b
Kepler-1805 b

  • Kepler-1805 b is an exoplanet orbiting the star Kepler-1805, located about 722.9 light-years (221.6 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Kepler-1805 has apparent magnitude of 15.5, with absolute magnitude of 8.8.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3796 with its spectral types of M1V
  • In this planetary system, the extrasolar planet Kepler-1805 b orbits around the star Kepler-1805 every 8.8 days with its orbital distance of 0.07 AU ( 10456891.2 km)
  • (Projected orbit of Kepler-1805 b around its host star Kepler-1805)


  • The Star Kepler-1805 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.186 AU ( 27832792.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.257 AU ( 38472192.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.392 AU ( 58623107.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.577 AU ( 86266471.1 km)
  • Radiation at Planetary Boundary of Kepler-1805 b : 18511.76 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1805)



  • Kopparapu Recent Venus for Star Kepler-1805 distance : 0.209 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1805 distance : 0.265 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1805 distance : 0.256 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1805 distance : 0.281 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1805 distance : 0.508 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1805 distance : 0.536 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1805)



  • Original Kopparapu Recent Venus for Star Kepler-1805 distance : 0.207 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1805 distance : 0.274 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1805 distance : 0.274 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1805 distance : 0.516 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1805 distance : 0.537 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1805)



    (Position in Stellar Map of star Kepler-1805 and its Exoplanet Kepler-1805 b)



    (Zoomed position in Stellar Map of star Kepler-1805 and its Exoplanet Kepler-1805 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1805*)
    *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