Imaginary Picture of Kepler-178 b

Display orbital revolution of Kepler-178 b around the hoststar Kepler-178
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Exoplanet Name : Kepler-178 b
Alternate Name : "2MASS J19082426+4653473 b, K00528.01, KIC 9941859 b, KOI-528 b, KOI-528.01, WISE J190824.25+465347.1 b"
Radius (Rjup / Re): 0.2590 (Rjup) 2.9031 (Rearth)
Mass (Mjup / Me): 0.0224 (Mjup) 7.1085 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0850 (AU) 0.0850 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0262
Orbital Period(Observed/Estimated) 9.58 (Days Obs.) 10.85 (Days Est.)
Surface Gravity (G Earth) 0.8434
Star Radiation at Atmospheric Boundary: 114925.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 821.8 (K)
Blackbody T 0.3(K) 771.7 (K)
Blackbody T 0.7(K) 624.4 (K)
Tidally Locked Blackbody T 0.1(K) 977.2 (K)
Tidally Locked Blackbody T 0.3(K) 917.7 (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-178
Alternate Name : "2MASS J19082426+4653473, KIC 9941859, KOI-528, WISE J190824.25+465347.1"
Star Distance(LY) : 2334.7
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5386 (K)
Spectral type : G5
UV portion[%]: 7.5
Visible portion[%]: 44.3
IR portion[%]: 48.2
Metalicity : -0.2
Absolute Magnitude: 4.0
Apparent Magnitude: 13.3
Right Ascension(RA) 287.1011
Declination (DEC) 46.8965
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-178+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-178%20b/
Kepler-178 b
Kepler-178 b

  • Kepler-178 b is an exoplanet orbiting the star Kepler-178, located about 2334.7 light-years (715.8 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-178 has apparent magnitude of 13.3, with absolute magnitude of 4.0.
  • It is 0.7 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5386 with its spectral types of G5
  • In this planetary system, the extrasolar planet Kepler-178 b orbits around the star Kepler-178 every 9.6 days with its orbital distance of 0.09 AU ( 12715819.0 km)
  • (Projected orbit of Kepler-178 b around its host star Kepler-178)


  • The Star Kepler-178 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.564 AU ( 84330224.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.779 AU ( 116566407.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.187 AU ( 177621409.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.747 AU ( 261377684.6 km)
  • Radiation at Planetary Boundary of Kepler-178 b : 114925.72 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-178)



  • Kopparapu Recent Venus for Star Kepler-178 distance : 0.598 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-178 distance : 0.757 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-178 distance : 0.731 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-178 distance : 0.802 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-178 distance : 1.352 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-178 distance : 1.427 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-178)



  • Original Kopparapu Recent Venus for Star Kepler-178 distance : 0.594 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-178 distance : 0.779 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-178 distance : 0.786 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-178 distance : 1.376 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-178 distance : 1.431 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-178)



    (Position in Stellar Map of star Kepler-178 and its Exoplanet Kepler-178 b)



    (Zoomed position in Stellar Map of star Kepler-178 and its Exoplanet Kepler-178 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-178*)
    *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