Imaginary Picture of XO-2 S c

Display orbital revolution of XO-2 S c around the hoststar XO-2S
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Exoplanet Name : XO-2 S c
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.3700 (Mjup) 435.5751 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.4756 (AU) 0.4756 (AU Est.)
Eccentricity : 0.1528
Orbital Period(Yrs) 0.3307
Orbital Period(Observed/Estimated) 120.80 (Days Obs.) 120.89 (Days Est.)
Surface Gravity (G Earth) 4.2065
Star Radiation at Atmospheric Boundary: 4792.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 371.4 (K)
Blackbody T 0.3(K) 348.7 (K)
Blackbody T 0.7(K) 282.2 (K)
Tidally Locked Blackbody T 0.1(K) 441.6 (K)
Tidally Locked Blackbody T 0.3(K) 414.7 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
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
UV portion[%]: 6.4
Visible portion[%]: 42.4
IR portion[%]: 51.2
Metalicity : 0.4
Absolute Magnitude: 5.3
Apparent Magnitude: 11.2
Right Ascension(RA) 117.0312
Declination (DEC) 50.2176
Hubble Space Telescope Guide Star Catalog (GSC) ID 03413-00210
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK https://simbad.u-strasbg.fr/simbad/sim-basic?Ident=XO-2+S&submit=SIMBAD+search
Open Exoplanet Database Link
XO-2 S c
XO-2 S c

  • XO-2 S c 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-2 S c orbits around the star XO-2S every 120.8 days with its orbital distance of 0.48 AU ( 71148747.3 km)
  • (Projected orbit of XO-2 S c 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-2 S c : 4792.64 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-2 S c)



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

    (Synthetic Spectrum of star XO-2S*)
    *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