Imaginary Picture of Cha Ha 8 b
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Exoplanet Name : Cha Ha 8 b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 25.0000 (Mjup) 7948.4500 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.0200 (AU) 1.0200 (AU Est.)
Eccentricity : 0.5900
Orbital Period(Yrs) 5.1881
Orbital Period(Observed/Estimated) 1895.00 (Days Obs.) 1290.57 (Days Est.)
Star Radiation at Atmospheric Boundary: 0.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 40.2 (K)
Blackbody T 0.3(K) 37.8 (K)
Blackbody T 0.7(K) 30.6 (K)
Tidally Locked Blackbody T 0.1(K) 47.8 (K)
Tidally Locked Blackbody T 0.3(K) 44.9 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Cha Ha 8
Alternate Name : 2MASS J11074610-7740089
Star Distance(LY) : 641.7
Stellar Radius(Rsun) : 0.1 (Rsun Estimated)
Stellar Mass(Msun) : 0.1 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 2967 (K)
Spectral type : M6.5
Metalicity : 0.0
Absolute Magnitude: 13.6
Apparent Magnitude: 20.1
Right Ascension(RA) 166.9420
Declination (DEC) -77.6691
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
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SIMBAD LINK
Open Exoplanet Database Link
Cha Ha 8 b
Cha Ha 8 b

  • Cha Ha 8 b is an exoplanet orbiting the star Cha Ha 8, located about 641.7 light-years (196.8 pc) away from Solar System. Its discovery was publicly announced on 2007.
  • The host star Cha Ha 8 has apparent magnitude of 20.1, with absolute magnitude of 13.6.
  • It is 0.1 times more massive and 0.1 times bigger compared with our Sun. The surface temperature is 2967 with its spectral types of M6.5
  • In this planetary system, the extrasolar planet Cha Ha 8 b orbits around the star Cha Ha 8 every 1895.0 days with its orbital distance of 1.02 AU ( 152589828.1 km)
  • (Projected orbit of Cha Ha 8 b around its host star Cha Ha 8)


  • The Star Cha Ha 8 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.016 AU ( 2425002.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.022 AU ( 3351986.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.034 AU ( 5107686.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.050 AU ( 7516183.7 km)
  • Radiation at Planetary Boundary of Cha Ha 8 b : 0.66 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Cha Ha 8)



  • Kopparapu Recent Venus for Star Cha Ha 8 distance : 0.018 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Cha Ha 8 distance : 0.023 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Cha Ha 8 distance : 0.022 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Cha Ha 8 distance : 0.025 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Cha Ha 8 distance : 0.047 AU
  • Kopparapu Outer Boundary for Early Mars for Star Cha Ha 8 distance : 0.049 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Cha Ha 8)



  • Original Kopparapu Recent Venus for Star Cha Ha 8 distance : 0.018 AU
  • Original Kopparapu Runaway Greenhouse for Star Cha Ha 8 distance : 0.024 AU
  • Original Kopparapu Moist Greenhouse for Star Cha Ha 8 distance : 0.024 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Cha Ha 8 distance : 0.047 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Cha Ha 8 distance : 0.049 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Cha Ha 8)



    (Position in Stellar Map of star Cha Ha 8 and its Exoplanet Cha Ha 8 b)



    (Zoomed position in Stellar Map of star Cha Ha 8 and its Exoplanet Cha Ha 8 b (zoom level 3))