Imaginary Picture of Kepler-181 c

Display orbital revolution of Kepler-181 c around the hoststar Kepler-181
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Exoplanet Name : Kepler-181 c
Alternate Name : "2MASS J19443633+5005449 c, K00543.01, KIC 11823054 c, KOI-543 c, KOI-543.01, WISE J194436.31+500544.8 c"
Status : Confirmed
Radius (Rjup / Re): 0.1780 (Rjup) 1.9952 (Rearth)
Mass (Mjup / Me): 0.0158 (Mjup) 5.0153 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0490 (AU) 0.0490 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0118
Orbital Period(Observed/Estimated) 4.30 (Days Obs.) 4.67 (Days Est.)
Surface Gravity (G Earth) 1.2599
Star Radiation at Atmospheric Boundary: 222391.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 969.2 (K)
Blackbody T 0.3(K) 910.2 (K)
Blackbody T 0.7(K) 736.4 (K)
Tidally Locked Blackbody T 0.1(K) 1152.6 (K)
Tidally Locked Blackbody T 0.3(K) 1082.4 (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-181
Alternate Name : "2MASS J19443633+5005449, KIC 11823054, KOI-543, WISE J194436.31+500544.8"
Star Distance(LY) : 1986.6
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5120 (K)
Spectral type : K0
UV portion[%]: 6.0
Visible portion[%]: 41.8
IR portion[%]: 52.2
Metalicity : -0.2
Absolute Magnitude: 4.4
Apparent Magnitude: 13.4
Right Ascension(RA) 296.1514
Declination (DEC) 50.0958
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-181+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-181%20c/
Kepler-181 c
Kepler-181 c

  • Kepler-181 c is an exoplanet orbiting the star Kepler-181, located about 1986.6 light-years (609.1 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-181 has apparent magnitude of 13.4, with absolute magnitude of 4.4.
  • It is 0.7 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5120 with its spectral types of K0
  • In this planetary system, the extrasolar planet Kepler-181 c orbits around the star Kepler-181 every 4.3 days with its orbital distance of 0.05 AU ( 7330295.7 km)
  • (Projected orbit of Kepler-181 c around its host star Kepler-181)


  • The Star Kepler-181 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.452 AU ( 67625595.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.625 AU ( 93476245.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.952 AU ( 142437112.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.401 AU ( 209602450.1 km)
  • Radiation at Planetary Boundary of Kepler-181 c : 222391.73 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-181)



  • Kopparapu Recent Venus for Star Kepler-181 distance : 0.486 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-181 distance : 0.616 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-181 distance : 0.595 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-181 distance : 0.652 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-181 distance : 1.110 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-181 distance : 1.171 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-181)



  • Original Kopparapu Recent Venus for Star Kepler-181 distance : 0.482 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-181 distance : 0.634 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-181 distance : 0.637 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-181 distance : 1.129 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-181 distance : 1.174 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-181)



    (Position in Stellar Map of star Kepler-181 and its Exoplanet Kepler-181 c)



    (Zoomed position in Stellar Map of star Kepler-181 and its Exoplanet Kepler-181 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-181*)
    *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