Imaginary Picture of 81 Cet b
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Exoplanet Name : 81 Cet b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 5.3000 (Mjup) 1685.0714 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.5000 (AU) 2.5000 (AU Est.)
Eccentricity : 0.2060
Orbital Period(Yrs) 2.6083
Orbital Period(Observed/Estimated) 952.70 (Days Obs.) 931.95 (Days Est.)
Star Radiation at Atmospheric Boundary: 24365.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 557.6 (K)
Blackbody T 0.3(K) 523.7 (K)
Blackbody T 0.7(K) 423.7 (K)
Tidally Locked Blackbody T 0.1(K) 663.1 (K)
Tidally Locked Blackbody T 0.3(K) 622.7 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : 81 Cet
Alternate Name :
Star Distance(LY) : 301.7
Stellar Radius(Rsun) : 11.0 (Rsun Measured)
Stellar Mass(Msun) : 2.4 (Msun Measured) 2.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5660 (K)
Spectral type : G5III
Metalicity : -0.1
Absolute Magnitude: 0.8
Apparent Magnitude: 5.7
Right Ascension(RA) 39.4250
Declination (DEC) -3.3961
Hubble Space Telescope Guide Star Catalog (GSC) ID 04701-01094
Discovered by Bunei Sato et al.
Discovery Paper - Authors "Sato,un'ei; Toyota,ri; Omiya,asashi; Izumiura,ideyuki; Kambe,iji; Masuda,eiji; Takeda,oichi; Itoh,oichi; Ando,iroyasu; Yoshida,ichitoshi; Kokubo,iichiro; Ida,higeru"
Discovery Paper - Title "Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD167042"
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=81+Cet+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/81%20Cet%20b/
81 Cet b
81 Cet b

  • 81 Cet b is an exoplanet orbiting the star 81 Cet, located about 301.7 light-years (92.5 pc) away from Solar System. Its discovery was publicly announced on 2008.
  • The host star 81 Cet has apparent magnitude of 5.7, with absolute magnitude of 0.8.
  • It is 2.4 times more massive and 11.0 times bigger compared with our Sun. The surface temperature is 5660 with its spectral types of G5III
  • In this planetary system, the extrasolar planet 81 Cet b orbits around the star 81 Cet every 952.7 days with its orbital distance of 2.50 AU ( 373994676.8 km)
  • (Projected orbit of 81 Cet b around its host star 81 Cet)


  • The Star 81 Cet 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 7.634 AU ( 1142046165.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 10.552 AU ( 1578606253.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 16.079 AU ( 2405446585.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 23.662 AU ( 3539720025.7 km)
  • Radiation at Planetary Boundary of 81 Cet b : 24365.53 W/m2

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



  • Kopparapu Recent Venus for Star 81 Cet distance : 7.968 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 81 Cet distance : 10.090 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 81 Cet distance : 9.745 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 81 Cet distance : 10.686 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 81 Cet distance : 17.877 AU
  • Kopparapu Outer Boundary for Early Mars for Star 81 Cet distance : 18.856 AU

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



  • Original Kopparapu Recent Venus for Star 81 Cet distance : 7.960 AU
  • Original Kopparapu Runaway Greenhouse for Star 81 Cet distance : 10.373 AU
  • Original Kopparapu Moist Greenhouse for Star 81 Cet distance : 10.533 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 81 Cet distance : 18.189 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 81 Cet distance : 18.916 AU

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



    (Position in Stellar Map of star 81 Cet and its Exoplanet 81 Cet b)



    (Zoomed position in Stellar Map of star 81 Cet and its Exoplanet 81 Cet b (zoom level 3))