Imaginary Picture of WASP-4 b

Display orbital revolution of WASP-4 b around the hoststar WASP-4
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Exoplanet Name : WASP-4 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.3846 (Rjup) 15.5200 (Rearth)
Mass (Mjup / Me): 1.1974 (Mjup) 380.6990 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0231 (AU) 0.0231 (AU Est.)
Eccentricity : 0.0053
Orbital Period(Yrs) 0.0037
Orbital Period(Observed/Estimated) 1.34 (Days Obs.) 1.33 (Days Est.)
Surface Gravity (G Earth) 1.5805
Star Radiation at Atmospheric Boundary: 2776358.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1821.8 (K)
Blackbody T 0.3(K) 1710.9 (K)
Blackbody T 0.7(K) 1384.3 (K)
Tidally Locked Blackbody T 0.1(K) 2166.6 (K)
Tidally Locked Blackbody T 0.3(K) 2034.6 (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-4
Alternate Name :
Star Distance(LY) : 898.5
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5500 (K)
Spectral type : G8
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : -0.0
Absolute Magnitude: 5.4
Apparent Magnitude: 12.6
Right Ascension(RA) 353.5628
Declination (DEC) -42.0614
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors CUTRI R.M.; SKRUTSKIE M.F.; VAN DYK S.; BEICHMAN C.A.; CARPENTER J.M.; CHESTER T.; CAMBRESY L.; EVANS T.; FOWLER J.; GIZIS J.; HOWARD E.; HUCHRA J.; JARRETT T.; KOPAN E.L.; KIRKPATRICK J.D.; LIGHT R.M.; MARSH K.A.; McCALLON H.; SCHNEIDER S.; STIENING R.;
Discovery Paper - Title 2MASS All Sky Catalog of point sources.
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-4+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/WASP-4%20b/
WASP-4 b
WASP-4 b

  • WASP-4 b is an exoplanet orbiting the star WASP-4, located about 898.5 light-years (275.5 pc) away from Solar System. Its discovery was publicly announced on 2007.
  • The host star WASP-4 has apparent magnitude of 12.6, with absolute magnitude of 5.4.
  • It is 0.9 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5500 with its spectral types of G8
  • In this planetary system, the extrasolar planet WASP-4 b orbits around the star WASP-4 every 1.3 days with its orbital distance of 0.02 AU ( 3458702.8 km)
  • (Projected orbit of WASP-4 b around its host star WASP-4)


  • The Star WASP-4 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.754 AU ( 112740857.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.042 AU ( 155837327.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.587 AU ( 237461599.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.336 AU ( 349435146.6 km)
  • Radiation at Planetary Boundary of WASP-4 b : 2776358.79 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star WASP-4)



  • Kopparapu Recent Venus for Star WASP-4 distance : 0.794 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star WASP-4 distance : 1.005 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star WASP-4 distance : 0.971 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star WASP-4 distance : 1.065 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star WASP-4 distance : 1.790 AU
  • Kopparapu Outer Boundary for Early Mars for Star WASP-4 distance : 1.888 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star WASP-4)



  • Original Kopparapu Recent Venus for Star WASP-4 distance : 0.791 AU
  • Original Kopparapu Runaway Greenhouse for Star WASP-4 distance : 1.034 AU
  • Original Kopparapu Moist Greenhouse for Star WASP-4 distance : 1.047 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star WASP-4 distance : 1.821 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star WASP-4 distance : 1.894 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star WASP-4)



    (Position in Stellar Map of star WASP-4 and its Exoplanet WASP-4 b)



    (Zoomed position in Stellar Map of star WASP-4 and its Exoplanet WASP-4 b (zoom level 3))

    (Synthetic Spectrum of star WASP-4*)
    *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