Imaginary Picture of XO-4 b
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Exoplanet Name : XO-4 b
Alternate Name :
Radius (Rjup / Re): 1.3170 (Rjup) 14.7623 (Rearth)
Mass (Mjup / Me): 1.6160 (Mjup) 513.7878 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0549 (AU) 0.0549 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0113
Orbital Period(Observed/Estimated) 4.12 (Days Obs.) 4.08 (Days Est.)
Star Radiation at Atmospheric Boundary: 1033747.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1423.1 (K)
Blackbody T 0.3(K) 1336.5 (K)
Blackbody T 0.7(K) 1081.3 (K)
Tidally Locked Blackbody T 0.1(K) 1692.4 (K)
Tidally Locked Blackbody T 0.3(K) 1589.3 (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 : XO-4
Alternate Name :
Star Distance(LY) : 955.6
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 2.1 (GY)
Temperature : 5700 (K)
Spectral type : F5V
Metalicity : -0.0
Absolute Magnitude: 3.4
Apparent Magnitude: 10.7
Right Ascension(RA) 110.3882
Declination (DEC) 58.2681
Hubble Space Telescope Guide Star Catalog (GSC) ID 03793-01994
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=XO-4+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/XO-4%20b/
XO-4 b
XO-4 b

  • XO-4 b is an exoplanet orbiting the star XO-4, located about 955.6 light-years (293.0 pc) away from Solar System. Its discovery was publicly announced on 2008.
  • The host star XO-4 has apparent magnitude of 10.7, with absolute magnitude of 3.4.
  • It is 1.3 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 5700 with its spectral types of F5V
  • In this planetary system, the extrasolar planet XO-4 b orbits around the star XO-4 every 4.1 days with its orbital distance of 0.05 AU ( 8205443.2 km)
  • (Projected orbit of XO-4 b around its host star XO-4)


  • The Star XO-4 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.091 AU ( 163207278.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.508 AU ( 225595109.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.298 AU ( 343757022.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.381 AU ( 505853518.2 km)
  • Radiation at Planetary Boundary of XO-4 b : 1033747.25 W/m2

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



  • Kopparapu Recent Venus for Star XO-4 distance : 1.136 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star XO-4 distance : 1.439 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star XO-4 distance : 1.389 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star XO-4 distance : 1.523 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star XO-4 distance : 2.546 AU
  • Kopparapu Outer Boundary for Early Mars for Star XO-4 distance : 2.685 AU

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



  • Original Kopparapu Recent Venus for Star XO-4 distance : 1.136 AU
  • Original Kopparapu Runaway Greenhouse for Star XO-4 distance : 1.479 AU
  • Original Kopparapu Moist Greenhouse for Star XO-4 distance : 1.503 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star XO-4 distance : 2.590 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star XO-4 distance : 2.694 AU

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



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



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