Imaginary Picture of HIP 65A b
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Exoplanet Name : HIP 65A b
Alternate Name : TOI-129 b
Radius (Rjup / Re): 2.0300 (Rjup) 22.7543 (Rearth)
Mass (Mjup / Me): 3.2130 (Mjup) 1021.5348 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0178 (AU) 0.0178 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0027
Orbital Period(Observed/Estimated) 0.98 (Days Obs.) 0.98 (Days Est.)
Star Radiation at Atmospheric Boundary: 898994.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1374.3 (K)
Blackbody T 0.3(K) 1290.6 (K)
Blackbody T 0.7(K) 1044.2 (K)
Tidally Locked Blackbody T 0.1(K) 1634.3 (K)
Tidally Locked Blackbody T 0.3(K) 1534.8 (K)
Size Class: Sub-Star-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HIP 65A
Alternate Name : TOI-129
Star Distance(LY) : 201.9
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 4.1 (GY)
Temperature : 4590 (K)
Spectral type : K4V
Metalicity : 0.2
Absolute Magnitude: 7.1
Apparent Magnitude: 11.1
Right Ascension(RA) 0.1875
Declination (DEC) -54.8308
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
HIP 65A b
HIP 65A b

  • HIP 65A b is an exoplanet orbiting the star HIP 65A, located about 201.9 light-years (61.9 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star HIP 65A has apparent magnitude of 11.1, with absolute magnitude of 7.1.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4590 with its spectral types of K4V
  • In this planetary system, the extrasolar planet HIP 65A b orbits around the star HIP 65A every 1.0 days with its orbital distance of 0.02 AU ( 2665834.1 km)
  • (Projected orbit of HIP 65A b around its host star HIP 65A)


  • The Star HIP 65A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.331 AU ( 49447234.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.457 AU ( 68348999.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.696 AU ( 104148749.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.024 AU ( 153259447.9 km)
  • Radiation at Planetary Boundary of HIP 65A b : 898994.83 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HIP 65A)



  • Kopparapu Recent Venus for Star HIP 65A distance : 0.364 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HIP 65A distance : 0.461 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HIP 65A distance : 0.445 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HIP 65A distance : 0.489 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 65A distance : 0.850 AU
  • Kopparapu Outer Boundary for Early Mars for Star HIP 65A distance : 0.896 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HIP 65A)



  • Original Kopparapu Recent Venus for Star HIP 65A distance : 0.359 AU
  • Original Kopparapu Runaway Greenhouse for Star HIP 65A distance : 0.475 AU
  • Original Kopparapu Moist Greenhouse for Star HIP 65A distance : 0.475 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 65A distance : 0.864 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HIP 65A distance : 0.898 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HIP 65A)



    (Position in Stellar Map of star HIP 65A and its Exoplanet HIP 65A b)



    (Zoomed position in Stellar Map of star HIP 65A and its Exoplanet HIP 65A b (zoom level 3))