Imaginary Picture of CoRoT-21 b
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Exoplanet Name : CoRoT-21 b
Alternate Name :
Radius (Rjup / Re): 1.3000 (Rjup) 14.5717 (Rearth)
Mass (Mjup / Me): 2.2600 (Mjup) 718.5399 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0417 (AU) 0.0417 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0075
Orbital Period(Observed/Estimated) 2.72 (Days Obs.) 2.74 (Days Est.)
Star Radiation at Atmospheric Boundary: 3942200.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1988.7 (K)
Blackbody T 0.3(K) 1867.6 (K)
Blackbody T 0.7(K) 1511.1 (K)
Tidally Locked Blackbody T 0.1(K) 2365.0 (K)
Tidally Locked Blackbody T 0.3(K) 2221.0 (K)
Size Class: Super-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : CoRoT-21
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 1.9 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 4.1 (GY)
Temperature : 6200 (K)
Spectral type : F8IV
Metalicity : 0.0
Absolute Magnitude: 25.0
Apparent Magnitude: 16.0
Right Ascension(RA) 101.0526
Declination (DEC) -0.2991
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.; SYKES M.; WEINBERG M.; WHEATON W.A.; WHEELOCK S.; ZACARIAS N.
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=CoRoT-21+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/CoRoT-21%20b/
CoRoT-21 b
CoRoT-21 b

  • CoRoT-21 b is an exoplanet orbiting the star CoRoT-21. Its discovery was publicly announced on 2011.
  • The host star CoRoT-21 has apparent magnitude of 16.0, with absolute magnitude of 25.0.
  • It is 1.3 times more massive and 1.9 times bigger compared with our Sun. The surface temperature is 6200 with its spectral types of F8IV
  • In this planetary system, the extrasolar planet CoRoT-21 b orbits around the star CoRoT-21 every 2.7 days with its orbital distance of 0.04 AU ( 6238231.2 km)
  • (Projected orbit of CoRoT-21 b around its host star CoRoT-21)


  • The Star CoRoT-21 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.620 AU ( 242304286.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.239 AU ( 334927845.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.412 AU ( 510355917.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 5.020 AU ( 751011089.6 km)
  • Radiation at Planetary Boundary of CoRoT-21 b : 3942200.15 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star CoRoT-21)



  • Kopparapu Recent Venus for Star CoRoT-21 distance : 1.636 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star CoRoT-21 distance : 2.072 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star CoRoT-21 distance : 2.001 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star CoRoT-21 distance : 2.193 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star CoRoT-21 distance : 3.624 AU
  • Kopparapu Outer Boundary for Early Mars for Star CoRoT-21 distance : 3.822 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star CoRoT-21)



  • Original Kopparapu Recent Venus for Star CoRoT-21 distance : 1.653 AU
  • Original Kopparapu Runaway Greenhouse for Star CoRoT-21 distance : 2.126 AU
  • Original Kopparapu Moist Greenhouse for Star CoRoT-21 distance : 2.187 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star CoRoT-21 distance : 3.689 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star CoRoT-21 distance : 3.836 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star CoRoT-21)



    (Position in Stellar Map of star CoRoT-21 and its Exoplanet CoRoT-21 b)



    (Zoomed position in Stellar Map of star CoRoT-21 and its Exoplanet CoRoT-21 b (zoom level 3))