Imaginary Picture of HATS-38 b
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Exoplanet Name : HATS-38 b
Alternate Name :
Radius (Rjup / Re): 0.6140 (Rjup) 6.8823 (Rearth)
Mass (Mjup / Me): 0.0740 (Mjup) 23.5274 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0504 (AU) 0.0504 (AU Est.)
Eccentricity : 0.1220
Orbital Period(Yrs) 0.0120
Orbital Period(Observed/Estimated) 4.38 (Days Obs.) 4.38 (Days Est.)
Star Radiation at Atmospheric Boundary: 637356.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1261.1 (K)
Blackbody T 0.3(K) 1184.3 (K)
Blackbody T 0.7(K) 958.2 (K)
Tidally Locked Blackbody T 0.1(K) 1499.7 (K)
Tidally Locked Blackbody T 0.3(K) 1408.3 (K)
Size Class: sub-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-38
Alternate Name :
Star Distance(LY) : 1134.0
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 11.9 (GY)
Temperature : 5732 (K)
Spectral type : G3
Metalicity : -0.1
Absolute Magnitude: 4.7
Apparent Magnitude: 12.4
Right Ascension(RA) 154.2708
Declination (DEC) -25.2764
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
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SIMBAD LINK
Open Exoplanet Database Link
HATS-38 b
HATS-38 b

  • HATS-38 b is an exoplanet orbiting the star HATS-38, located about 1134.0 light-years (347.7 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star HATS-38 has apparent magnitude of 12.4, with absolute magnitude of 4.7.
  • It is 0.9 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5732 with its spectral types of G3
  • In this planetary system, the extrasolar planet HATS-38 b orbits around the star HATS-38 every 4.4 days with its orbital distance of 0.05 AU ( 7533748.8 km)
  • (Projected orbit of HATS-38 b around its host star HATS-38)


  • The Star HATS-38 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.787 AU ( 117661059.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.087 AU ( 162638332.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.657 AU ( 247824826.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.438 AU ( 364685089.2 km)
  • Radiation at Planetary Boundary of HATS-38 b : 637356.84 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HATS-38)



  • Kopparapu Recent Venus for Star HATS-38 distance : 0.817 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HATS-38 distance : 1.035 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HATS-38 distance : 1.000 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HATS-38 distance : 1.096 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-38 distance : 1.830 AU
  • Kopparapu Outer Boundary for Early Mars for Star HATS-38 distance : 1.930 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HATS-38)



  • Original Kopparapu Recent Venus for Star HATS-38 distance : 0.818 AU
  • Original Kopparapu Runaway Greenhouse for Star HATS-38 distance : 1.064 AU
  • Original Kopparapu Moist Greenhouse for Star HATS-38 distance : 1.082 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-38 distance : 1.862 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HATS-38 distance : 1.937 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HATS-38)



    (Position in Stellar Map of star HATS-38 and its Exoplanet HATS-38 b)



    (Zoomed position in Stellar Map of star HATS-38 and its Exoplanet HATS-38 b (zoom level 3))