Imaginary Picture of Kepler-178 c

Display orbital revolution of Kepler-178 c around the hoststar Kepler-178
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Exoplanet Name : Kepler-178 c
Alternate Name : "2MASS J19082426+4653473 c, K00528.03, KIC 9941859 c, KOI-528 c, KOI-528.03, WISE J190824.25+465347.1 c"
Status : Confirmed
Radius (Rjup / Re): 0.2570 (Rjup) 2.8807 (Rearth)
Mass (Mjup / Me): 0.0222 (Mjup) 7.0575 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1420 (AU) 0.1420 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0563
Orbital Period(Observed/Estimated) 20.55 (Days Obs.) 19.95 (Days Est.)
Surface Gravity (G Earth) 0.8504
Star Radiation at Atmospheric Boundary: 41179.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 635.8 (K)
Blackbody T 0.3(K) 597.1 (K)
Blackbody T 0.7(K) 483.1 (K)
Tidally Locked Blackbody T 0.1(K) 756.1 (K)
Tidally Locked Blackbody T 0.3(K) 710.0 (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) : 1.0 (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%20c/
Kepler-178 c
Kepler-178 c

  • Kepler-178 c 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 1.0 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 c orbits around the star Kepler-178 every 20.6 days with its orbital distance of 0.14 AU ( 21242897.6 km)
  • (Projected orbit of Kepler-178 c 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 c : 41179.25 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 c)



    (Zoomed position in Stellar Map of star Kepler-178 and its Exoplanet Kepler-178 c (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