Imaginary Picture of Kepler-123 b

Display orbital revolution of Kepler-123 b around the hoststar Kepler-123
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Exoplanet Name : Kepler-123 b
Alternate Name : "2MASS J19475966+4246550 b, K00238.01, KIC 7219825 b, KOI-238 b, KOI-238.01, WISE J194759.65+424655.1 b"
Status : Confirmed
Radius (Rjup / Re): 0.2620 (Rjup) 2.9368 (Rearth)
Mass (Mjup / Me): 0.0226 (Mjup) 7.1851 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1350 (AU) 0.1350 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0472
Orbital Period(Observed/Estimated) 17.23 (Days Obs.) 17.85 (Days Est.)
Surface Gravity (G Earth) 0.8331
Star Radiation at Atmospheric Boundary: 179028.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 918.1 (K)
Blackbody T 0.3(K) 862.2 (K)
Blackbody T 0.7(K) 697.6 (K)
Tidally Locked Blackbody T 0.1(K) 1091.8 (K)
Tidally Locked Blackbody T 0.3(K) 1025.3 (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-123
Alternate Name : "2MASS J19475966+4246550, KIC 7219825, KOI-238, WISE J194759.65+424655.1"
Star Distance(LY) : 3331.5
Stellar Radius(Rsun) : 1.4 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6154 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : -0.2
Absolute Magnitude: 2.9
Apparent Magnitude: 13.0
Right Ascension(RA) 296.9986
Declination (DEC) 42.7820
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-123+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-123%20b/
Kepler-123 b
Kepler-123 b

  • Kepler-123 b is an exoplanet orbiting the star Kepler-123, located about 3331.5 light-years (1021.4 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-123 has apparent magnitude of 13.0, with absolute magnitude of 2.9.
  • It is 1.0 times more massive and 1.4 times bigger compared with our Sun. The surface temperature is 6154 with its spectral types of G0
  • In this planetary system, the extrasolar planet Kepler-123 b orbits around the star Kepler-123 every 17.2 days with its orbital distance of 0.14 AU ( 20195712.5 km)
  • (Projected orbit of Kepler-123 b around its host star Kepler-123)


  • The Star Kepler-123 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.117 AU ( 167166867.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.545 AU ( 231068296.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.354 AU ( 352096948.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.463 AU ( 518126084.2 km)
  • Radiation at Planetary Boundary of Kepler-123 b : 179028.20 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-123)



  • Kopparapu Recent Venus for Star Kepler-123 distance : 1.132 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-123 distance : 1.434 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-123 distance : 1.384 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-123 distance : 1.517 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-123 distance : 2.509 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-123 distance : 2.647 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-123)



  • Original Kopparapu Recent Venus for Star Kepler-123 distance : 1.142 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-123 distance : 1.471 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-123 distance : 1.512 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-123 distance : 2.554 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-123 distance : 2.656 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-123)



    (Position in Stellar Map of star Kepler-123 and its Exoplanet Kepler-123 b)



    (Zoomed position in Stellar Map of star Kepler-123 and its Exoplanet Kepler-123 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-123*)
    *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