Imaginary Picture of 51 Peg b
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Exoplanet Name : 51 Peg b
Alternate Name :
Radius (Rjup / Re): 1.9000 (Rjup) 21.2971 (Rearth)
Mass (Mjup / Me): 0.4700 (Mjup) 149.4309 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0520 (AU) 0.0520 (AU Est.)
Eccentricity : 0.0069
Orbital Period(Yrs) 0.0116
Orbital Period(Observed/Estimated) 4.23 (Days Obs.) 4.11 (Days Est.)
Star Radiation at Atmospheric Boundary: 818614.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1342.5 (K)
Blackbody T 0.3(K) 1260.7 (K)
Blackbody T 0.7(K) 1020.1 (K)
Tidally Locked Blackbody T 0.1(K) 1596.5 (K)
Tidally Locked Blackbody T 0.3(K) 1499.3 (K)
Size Class: Super-Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection : Theoretical
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : 51 Peg
Alternate Name :
Star Distance(LY) : 47.9
Stellar Radius(Rsun) : 1.3 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 4.0 (GY)
Temperature : 5793 (K)
Spectral type : G2 IV
Metalicity : 0.2
Absolute Magnitude: 4.7
Apparent Magnitude: 5.5
Right Ascension(RA) 344.3625
Declination (DEC) 20.7686
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors "Martins,...; Santos,..; Figueira,.; Faria,..; Montalto,.; Boisse,.; Ehrenreich,.; Lovis,.; Mayor,.; Melo,.; Pepe,.; Sousa,..; Udry,.; Cunha,."
Discovery Paper - Title Evidence for a spectroscopic direct detection of reflected light from 51 Pegasi b
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=51+Peg+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/51%20Peg%20b/
51 Peg b
51 Peg b

  • 51 Peg b is an exoplanet orbiting the star 51 Peg, located about 47.9 light-years (14.7 pc) away from Solar System. Its discovery was publicly announced on 1995.
  • The host star 51 Peg has apparent magnitude of 5.5, with absolute magnitude of 4.7.
  • It is 1.1 times more massive and 1.3 times bigger compared with our Sun. The surface temperature is 5793 with its spectral types of G2 IV
  • In this planetary system, the extrasolar planet 51 Peg b orbits around the star 51 Peg every 4.2 days with its orbital distance of 0.05 AU ( 7779089.3 km)
  • (Projected orbit of 51 Peg b around its host star 51 Peg)


  • The Star 51 Peg 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.920 AU ( 137688882.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.272 AU ( 190322018.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.939 AU ( 290008637.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.853 AU ( 426760414.2 km)
  • Radiation at Planetary Boundary of 51 Peg b : 818614.91 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 51 Peg)



  • Kopparapu Recent Venus for Star 51 Peg distance : 0.953 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 51 Peg distance : 1.207 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 51 Peg distance : 1.166 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 51 Peg distance : 1.278 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 51 Peg distance : 2.130 AU
  • Kopparapu Outer Boundary for Early Mars for Star 51 Peg distance : 2.247 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 51 Peg)



  • Original Kopparapu Recent Venus for Star 51 Peg distance : 0.955 AU
  • Original Kopparapu Runaway Greenhouse for Star 51 Peg distance : 1.240 AU
  • Original Kopparapu Moist Greenhouse for Star 51 Peg distance : 1.263 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 51 Peg distance : 2.168 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 51 Peg distance : 2.255 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 51 Peg)



    (Position in Stellar Map of star 51 Peg and its Exoplanet 51 Peg b)



    (Zoomed position in Stellar Map of star 51 Peg and its Exoplanet 51 Peg b (zoom level 3))