Imaginary Picture of XO-2S b
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Exoplanet Name : XO-2S b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 0.2590 (Mjup) 82.3459 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1344 (AU) 0.1344 (AU Est.)
Eccentricity : 0.1800
Orbital Period(Yrs) 0.0497
Orbital Period(Observed/Estimated) 18.16 (Days Obs.) 18.16 (Days Est.)
Star Radiation at Atmospheric Boundary: 60015.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 698.6 (K)
Blackbody T 0.3(K) 656.0 (K)
Blackbody T 0.7(K) 530.8 (K)
Tidally Locked Blackbody T 0.1(K) 830.7 (K)
Tidally Locked Blackbody T 0.3(K) 780.2 (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 : XO-2S
Alternate Name :
Star Distance(LY) : 486.0
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 7.1 (GY)
Temperature : 5399 (K)
Spectral type : G9V
Metalicity : 0.4
Absolute Magnitude: 5.3
Apparent Magnitude: 11.2
Right Ascension(RA) 117.4042
Declination (DEC) 50.2175
Hubble Space Telescope Guide Star Catalog (GSC) ID 03413-00210
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-2S+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/XO-2S%20b/
XO-2S b
XO-2S b

  • XO-2S b is an exoplanet orbiting the star XO-2S, located about 486.0 light-years (149.0 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star XO-2S has apparent magnitude of 11.2, with absolute magnitude of 5.3.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5399 with its spectral types of G9V
  • In this planetary system, the extrasolar planet XO-2S b orbits around the star XO-2S every 18.2 days with its orbital distance of 0.13 AU ( 20105953.8 km)
  • (Projected orbit of XO-2S b around its host star XO-2S)


  • The Star XO-2S 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.644 AU ( 96357370.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.890 AU ( 133191067.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.357 AU ( 202953710.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.996 AU ( 298655276.5 km)
  • Radiation at Planetary Boundary of XO-2S b : 60015.02 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star XO-2S)



  • Kopparapu Recent Venus for Star XO-2S distance : 0.682 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star XO-2S distance : 0.864 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star XO-2S distance : 0.835 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star XO-2S distance : 0.915 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star XO-2S distance : 1.544 AU
  • Kopparapu Outer Boundary for Early Mars for Star XO-2S distance : 1.628 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star XO-2S)



  • Original Kopparapu Recent Venus for Star XO-2S distance : 0.679 AU
  • Original Kopparapu Runaway Greenhouse for Star XO-2S distance : 0.889 AU
  • Original Kopparapu Moist Greenhouse for Star XO-2S distance : 0.898 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star XO-2S distance : 1.570 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star XO-2S distance : 1.633 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star XO-2S)



    (Position in Stellar Map of star XO-2S and its Exoplanet XO-2S b)



    (Zoomed position in Stellar Map of star XO-2S and its Exoplanet XO-2S b (zoom level 3))