Imaginary Picture of Kepler-1851 b

Display orbital revolution of Kepler-1851 b around the hoststar Kepler-1851
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Exoplanet Name : Kepler-1851 b
Alternate Name : "KOI-2528 b, KOI-2528.01"
Status : Confirmed
Radius (Rjup / Re): 0.3480 (Rjup) 3.9007 (Rearth)
Mass (Mjup / Me): 0.0294 (Mjup) 9.3558 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1016 (AU) 0.1016 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0329
Orbital Period(Observed/Estimated) 12.02 (Days Obs.) 11.83 (Days Est.)
Surface Gravity (G Earth) 0.6149
Star Radiation at Atmospheric Boundary: 151223.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 880.1 (K)
Blackbody T 0.3(K) 826.5 (K)
Blackbody T 0.7(K) 668.8 (K)
Tidally Locked Blackbody T 0.1(K) 1046.7 (K)
Tidally Locked Blackbody T 0.3(K) 982.9 (K)
Size Class: Neptune-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-1851
Alternate Name : "KIC 9205907, KOI-2528"
Star Distance(LY) : 5185.3
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.3 (GY)
Temperature : 5629 (K)
Spectral type : G3V
UV portion[%]: 7.4
Visible portion[%]: 44.0
IR portion[%]: 48.6
Metalicity : -0.3
Absolute Magnitude: 4.7
Apparent Magnitude: 15.7
Right Ascension(RA) 285.6738
Declination (DEC) 45.6399
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-1851 b
Kepler-1851 b

  • Kepler-1851 b is an exoplanet orbiting the star Kepler-1851, located about 5185.3 light-years (1589.8 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Kepler-1851 has apparent magnitude of 15.7, with absolute magnitude of 4.7.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5629 with its spectral types of G3V
  • In this planetary system, the extrasolar planet Kepler-1851 b orbits around the star Kepler-1851 every 12.0 days with its orbital distance of 0.10 AU ( 15199143.7 km)
  • (Projected orbit of Kepler-1851 b around its host star Kepler-1851)


  • The Star Kepler-1851 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.773 AU ( 115626931.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.068 AU ( 159826636.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.628 AU ( 243540424.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.396 AU ( 358380402.7 km)
  • Radiation at Planetary Boundary of Kepler-1851 b : 151223.46 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1851)



  • Kopparapu Recent Venus for Star Kepler-1851 distance : 0.808 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1851 distance : 1.023 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1851 distance : 0.988 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1851 distance : 1.084 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1851 distance : 1.815 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1851 distance : 1.914 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1851)



  • Original Kopparapu Recent Venus for Star Kepler-1851 distance : 0.807 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1851 distance : 1.052 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1851 distance : 1.068 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1851 distance : 1.847 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1851 distance : 1.920 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1851)



    (Position in Stellar Map of star Kepler-1851 and its Exoplanet Kepler-1851 b)



    (Zoomed position in Stellar Map of star Kepler-1851 and its Exoplanet Kepler-1851 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1851*)
    *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