Imaginary Picture of Kepler-823 b

Display orbital revolution of Kepler-823 b around the hoststar Kepler-823
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Exoplanet Name : Kepler-823 b
Alternate Name : "2MASS J18581981+3913127 b, K01339.01, KIC 4135665 b, KOI-1339 b, KOI-1339.01, WISE J185819.81+391312.6 b"
Status : Confirmed
Radius (Rjup / Re): 0.1400 (Rjup) 1.5693 (Rearth)
Mass (Mjup / Me): 0.0126 (Mjup) 4.0115 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0503 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0114
Orbital Period(Observed/Estimated) 4.17 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.6290
Star Radiation at Atmospheric Boundary: 1112161.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1449.4 (K)
Blackbody T 0.3(K) 1361.1 (K)
Blackbody T 0.7(K) 1101.3 (K)
Tidally Locked Blackbody T 0.1(K) 1723.6 (K)
Tidally Locked Blackbody T 0.3(K) 1618.7 (K)
Size Class: super-Earth-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-823
Alternate Name : "2MASS J18581981+3913127, KIC 4135665, KOI-1339, WISE J185819.81+391312.6"
Star Distance(LY) : 4534.3
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 4.5 (GY)
Temperature : 5686 (K)
Spectral type : G5
UV portion[%]: 7.6
Visible portion[%]: 44.3
IR portion[%]: 48.1
Metalicity : 0.1
Absolute Magnitude: 2.9
Apparent Magnitude: 13.6
Right Ascension(RA) 284.5826
Declination (DEC) 39.2202
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 692 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-823&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-823%20b/
Kepler-823 b
Kepler-823 b

  • Kepler-823 b is an exoplanet orbiting the star Kepler-823, located about 4534.3 light-years (1390.2 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-823 has apparent magnitude of 13.6, with absolute magnitude of 2.9.
  • It is 1.0 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 5686 with its spectral types of G5
  • In this planetary system, the extrasolar planet Kepler-823 b orbits around the star Kepler-823 every 4.2 days with its orbital distance of 0.05 AU ( 7531799.3 km)
  • (Projected orbit of Kepler-823 b around its host star Kepler-823)


  • The Star Kepler-823 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.039 AU ( 155386389.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.436 AU ( 214784596.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.188 AU ( 327284193.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.219 AU ( 481613028.7 km)
  • Radiation at Planetary Boundary of Kepler-823 b : 1112161.57 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-823)



  • Kopparapu Recent Venus for Star Kepler-823 distance : 1.083 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-823 distance : 1.371 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-823 distance : 1.324 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-823 distance : 1.452 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-823 distance : 2.427 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-823 distance : 2.560 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-823)



  • Original Kopparapu Recent Venus for Star Kepler-823 distance : 1.082 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-823 distance : 1.409 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-823 distance : 1.432 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-823 distance : 2.469 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-823 distance : 2.568 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-823)



    (Position in Stellar Map of star Kepler-823 and its Exoplanet Kepler-823 b)



    (Zoomed position in Stellar Map of star Kepler-823 and its Exoplanet Kepler-823 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-823*)
    *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