Imaginary Picture of Kepler-81 c

Display orbital revolution of Kepler-81 c around the hoststar Kepler-81
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Exoplanet Name : Kepler-81 c
Alternate Name : "2MASS J19343286+4249298 c, K00877.02, KIC 7287995 c, KOI-877 c, KOI-877.02, WISE J193432.86+424929.4 c"
Status : Confirmed
Radius (Rjup / Re): 0.2110 (Rjup) 2.3651 (Rearth)
Mass (Mjup / Me): 0.0185 (Mjup) 5.8748 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0890 (AU) 0.0890 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0330
Orbital Period(Observed/Estimated) 12.04 (Days Obs.) 12.05 (Days Est.)
Surface Gravity (G Earth) 1.0503
Star Radiation at Atmospheric Boundary: 21140.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 538.2 (K)
Blackbody T 0.3(K) 505.4 (K)
Blackbody T 0.7(K) 408.9 (K)
Tidally Locked Blackbody T 0.1(K) 640.0 (K)
Tidally Locked Blackbody T 0.3(K) 601.0 (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-81
Alternate Name : "2MASS J19343286+4249298, KIC 7287995, KOI-877, WISE J193432.86+424929.4"
Star Distance(LY) : 1135.7
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4263 (K)
Spectral type : M0 V
UV portion[%]: 0.9
Visible portion[%]: 27.3
IR portion[%]: 71.8
Metalicity : -0.2
Absolute Magnitude: 7.9
Apparent Magnitude: 15.6
Right Ascension(RA) 293.6370
Declination (DEC) 42.8250
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-81+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-81%20c/
Kepler-81 c
Kepler-81 c

  • Kepler-81 c is an exoplanet orbiting the star Kepler-81, located about 1135.7 light-years (348.2 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star Kepler-81 has apparent magnitude of 15.6, with absolute magnitude of 7.9.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4263 with its spectral types of M0 V
  • In this planetary system, the extrasolar planet Kepler-81 c orbits around the star Kepler-81 every 12.0 days with its orbital distance of 0.09 AU ( 13314210.5 km)
  • (Projected orbit of Kepler-81 c around its host star Kepler-81)


  • The Star Kepler-81 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.253 AU ( 37870387.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.350 AU ( 52346772.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.533 AU ( 79764896.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.785 AU ( 117377540.1 km)
  • Radiation at Planetary Boundary of Kepler-81 c : 21140.15 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-81)



  • Kopparapu Recent Venus for Star Kepler-81 distance : 0.282 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-81 distance : 0.357 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-81 distance : 0.344 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-81 distance : 0.378 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-81 distance : 0.668 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-81 distance : 0.705 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-81)



  • Original Kopparapu Recent Venus for Star Kepler-81 distance : 0.278 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-81 distance : 0.368 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-81 distance : 0.368 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-81 distance : 0.679 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-81 distance : 0.706 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-81)



    (Position in Stellar Map of star Kepler-81 and its Exoplanet Kepler-81 c)



    (Zoomed position in Stellar Map of star Kepler-81 and its Exoplanet Kepler-81 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-81*)
    *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