Imaginary Picture of HATS-20 b
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Exoplanet Name : HATS-20 b
Alternate Name :
Radius (Rjup / Re): 0.7760 (Rjup) 8.6982 (Rearth)
Mass (Mjup / Me): 0.2730 (Mjup) 86.7971 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0462 (AU) 0.0462 (AU Est.)
Eccentricity : 0.5000
Orbital Period(Yrs) 0.0104
Orbital Period(Observed/Estimated) 3.80 (Days Obs.) 3.80 (Days Est.)
Star Radiation at Atmospheric Boundary: 390609.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1115.8 (K)
Blackbody T 0.3(K) 1047.8 (K)
Blackbody T 0.7(K) 847.8 (K)
Tidally Locked Blackbody T 0.1(K) 1326.9 (K)
Tidally Locked Blackbody T 0.3(K) 1246.1 (K)
Size Class: Jupiter-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 : HATS-20
Alternate Name :
Star Distance(LY) : 1480.7
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 6.4 (GY)
Temperature : 5406 (K)
Spectral type : G9V
Metalicity : 0.0
Absolute Magnitude: 5.5
Apparent Magnitude: 13.8
Right Ascension(RA) 198.1333
Declination (DEC) -45.5906
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link
HATS-20 b
HATS-20 b

  • HATS-20 b is an exoplanet orbiting the star HATS-20, located about 1480.7 light-years (454.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star HATS-20 has apparent magnitude of 13.8, with absolute magnitude of 5.5.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5406 with its spectral types of G9V
  • In this planetary system, the extrasolar planet HATS-20 b orbits around the star HATS-20 every 3.8 days with its orbital distance of 0.05 AU ( 6909925.6 km)
  • (Projected orbit of HATS-20 b around its host star HATS-20)


  • The Star HATS-20 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.565 AU ( 84484113.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.781 AU ( 116779122.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.189 AU ( 177945539.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.750 AU ( 261854657.2 km)
  • Radiation at Planetary Boundary of HATS-20 b : 390609.46 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HATS-20)



  • Kopparapu Recent Venus for Star HATS-20 distance : 0.598 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HATS-20 distance : 0.757 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HATS-20 distance : 0.732 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HATS-20 distance : 0.802 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-20 distance : 1.352 AU
  • Kopparapu Outer Boundary for Early Mars for Star HATS-20 distance : 1.427 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HATS-20)



  • Original Kopparapu Recent Venus for Star HATS-20 distance : 0.595 AU
  • Original Kopparapu Runaway Greenhouse for Star HATS-20 distance : 0.779 AU
  • Original Kopparapu Moist Greenhouse for Star HATS-20 distance : 0.787 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-20 distance : 1.376 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HATS-20 distance : 1.431 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HATS-20)



    (Position in Stellar Map of star HATS-20 and its Exoplanet HATS-20 b)



    (Zoomed position in Stellar Map of star HATS-20 and its Exoplanet HATS-20 b (zoom level 3))