Imaginary Picture of WASP-121 b
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Exoplanet Name : WASP-121 b
Alternate Name :
Radius (Rjup / Re): 1.8650 (Rjup) 20.9048 (Rearth)
Mass (Mjup / Me): 1.1840 (Mjup) 376.4386 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0254 (AU) 0.0254 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0035
Orbital Period(Observed/Estimated) 1.27 (Days Obs.) 1.27 (Days Est.)
Star Radiation at Atmospheric Boundary: 7014806.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 2296.9 (K)
Blackbody T 0.3(K) 2157.1 (K)
Blackbody T 0.7(K) 1745.3 (K)
Tidally Locked Blackbody T 0.1(K) 2731.5 (K)
Tidally Locked Blackbody T 0.3(K) 2565.2 (K)
Size Class: Super-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : WASP-121
Alternate Name :
Star Distance(LY) : 880.6
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.4 (Msun Measured) 1.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6460 (K)
Spectral type : F6V
Metalicity : 0.1
Absolute Magnitude: 3.2
Apparent Magnitude: 10.4
Right Ascension(RA) 107.6002
Declination (DEC) -39.0975
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors "L. Delrez, A. Santerne, J.-M. Almenara, D. R. Anderson, A. Collier-Cameron, R. F. D_az, M. Gillon, C. Hellier, E. Jehin, M. Lendl, P. F. L. Maxted, M. Neveu-VanMalle, F. Pepe, D. Pollacco, D. Queloz, D. S_gransan, B. Smalley, A. M. S. Smith, A. H. M. J. Triaud, S. Udry, V. Van Grootel, R. G. West"
Discovery Paper - Title WASP-121 b: a hot Jupiter in a polar orbit and close to tidal disruption
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-121+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/WASP-121%20b/
WASP-121 b
WASP-121 b

  • WASP-121 b is an exoplanet orbiting the star WASP-121, located about 880.6 light-years (270.0 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star WASP-121 has apparent magnitude of 10.4, with absolute magnitude of 3.2.
  • It is 1.4 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 6460 with its spectral types of F6V
  • In this planetary system, the extrasolar planet WASP-121 b orbits around the star WASP-121 every 1.3 days with its orbital distance of 0.03 AU ( 3805769.8 km)
  • (Projected orbit of WASP-121 b around its host star WASP-121)


  • The Star WASP-121 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.318 AU ( 197188086.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.822 AU ( 272565466.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.776 AU ( 415329452.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.085 AU ( 611175484.2 km)
  • Radiation at Planetary Boundary of WASP-121 b : 7014806.84 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star WASP-121)



  • Kopparapu Recent Venus for Star WASP-121 distance : 1.311 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star WASP-121 distance : 1.660 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star WASP-121 distance : 1.603 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star WASP-121 distance : 1.757 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star WASP-121 distance : 2.890 AU
  • Kopparapu Outer Boundary for Early Mars for Star WASP-121 distance : 3.048 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star WASP-121)



  • Original Kopparapu Recent Venus for Star WASP-121 distance : 1.332 AU
  • Original Kopparapu Runaway Greenhouse for Star WASP-121 distance : 1.702 AU
  • Original Kopparapu Moist Greenhouse for Star WASP-121 distance : 1.763 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star WASP-121 distance : 2.943 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star WASP-121 distance : 3.060 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star WASP-121)



    (Position in Stellar Map of star WASP-121 and its Exoplanet WASP-121 b)



    (Zoomed position in Stellar Map of star WASP-121 and its Exoplanet WASP-121 b (zoom level 3))