Imaginary Picture of CT Cha b

Display orbital revolution of CT Cha b around the hoststar CT Cha
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Exoplanet Name : CT Cha b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 2.2000 (Rjup) 24.6598 (Rearth)
Mass (Mjup / Me): 17.0000 (Mjup) 5404.9460 (Mearth)
Semi Major Axis / Orbital Distance Calculated 440.0000 (AU) 440.0000 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 2734308.08 (Days Est.)
Surface Gravity (G Earth) 8.8882
Star Radiation at Atmospheric Boundary: 0.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 7.5 (K)
Blackbody T 0.3(K) 7.0 (K)
Blackbody T 0.7(K) 5.7 (K)
Tidally Locked Blackbody T 0.1(K) 8.9 (K)
Tidally Locked Blackbody T 0.3(K) 8.3 (K)
Size Class: Sub-Star-size
Mass Class:
Detection Type : Imaging
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : CT Cha
Alternate Name :
Star Distance(LY) : 538.2
Stellar Radius(Rsun) : 0.7 (Rsun Estimated)
Stellar Mass(Msun) : 1.5 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4000 (K)
Spectral type : K7
UV portion[%]: 0.7
Visible portion[%]: 23.8
IR portion[%]: 75.5
Metalicity : 0.0
Absolute Magnitude: 6.3
Apparent Magnitude: 12.4
Right Ascension(RA) 166.0379
Declination (DEC) -76.4553
Hubble Space Telescope Guide Star Catalog (GSC) ID 09410-02536
Discovered by
Discovery Paper - Authors "Schmidt,...; Neuh_user,.; Seifahrt,.; Vogt,.; Bedalov,.; Helling,h.; Witte,.; Hauschildt,.."
Discovery Paper - Title Direct evidence of a sub-stellar companion around CT Chamaeleontis
Discovery Paper - Journal "A&A491,311-320(2008)DOI:10.1051/0004-6361:20078840"
Discovery Paper - URL http://www.aanda.org/articles/aa/ps/2008/43/aa8840-07.ps.gz
SIMBAD LINK http://simbad.harvard.edu/simbad/sim-basic?Ident=CT+Cha+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/CT%20Cha%20B/
CT Cha b
CT Cha b

  • CT Cha b is an exoplanet orbiting the star CT Cha, located about 538.2 light-years (165.0 pc) away from Solar System. Its discovery was publicly announced on 2008.
  • The host star CT Cha has apparent magnitude of 12.4, with absolute magnitude of 6.3.
  • It is 1.5 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4000 with its spectral types of K7
  • (Projected orbit of CT Cha b around its host star CT Cha)


  • The Star CT Cha 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.240 AU ( 35884717.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.332 AU ( 49602057.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.505 AU ( 75582558.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.743 AU ( 111223045.5 km)
  • Radiation at Planetary Boundary of CT Cha b : 0.00 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star CT Cha)



  • Kopparapu Recent Venus for Star CT Cha distance : 0.269 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star CT Cha distance : 0.340 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star CT Cha distance : 0.328 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star CT Cha distance : 0.361 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star CT Cha distance : 0.645 AU
  • Kopparapu Outer Boundary for Early Mars for Star CT Cha distance : 0.681 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star CT Cha)



  • Original Kopparapu Recent Venus for Star CT Cha distance : 0.265 AU
  • Original Kopparapu Runaway Greenhouse for Star CT Cha distance : 0.352 AU
  • Original Kopparapu Moist Greenhouse for Star CT Cha distance : 0.351 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star CT Cha distance : 0.656 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star CT Cha distance : 0.682 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star CT Cha)



    (Position in Stellar Map of star CT Cha and its Exoplanet CT Cha b)



    (Zoomed position in Stellar Map of star CT Cha and its Exoplanet CT Cha b (zoom level 3))

    (Synthetic Spectrum of star CT Cha*)
    *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