Imaginary Picture of HAT-P-20 b
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Exoplanet Name : HAT-P-20 b
Alternate Name :
Radius (Rjup / Re): 0.8670 (Rjup) 9.7182 (Rearth)
Mass (Mjup / Me): 7.2460 (Mjup) 2303.7787 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0361 (AU) 0.0361 (AU Est.)
Eccentricity : 0.0150
Orbital Period(Yrs) 0.0079
Orbital Period(Observed/Estimated) 2.88 (Days Obs.) 2.88 (Days Est.)
Star Radiation at Atmospheric Boundary: 202046.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 946.2 (K)
Blackbody T 0.3(K) 888.6 (K)
Blackbody T 0.7(K) 719.0 (K)
Tidally Locked Blackbody T 0.1(K) 1125.3 (K)
Tidally Locked Blackbody T 0.3(K) 1056.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HAT-P-20
Alternate Name :
Star Distance(LY) : 228.3
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 6.7 (GY)
Temperature : 4595 (K)
Spectral type : K7
Metalicity : 0.3
Absolute Magnitude: 7.1
Apparent Magnitude: 11.3
Right Ascension(RA) 111.9165
Declination (DEC) 24.3364
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors CUTRI R.M.; SKRUTSKIE M.F.; VAN DYK S.; BEICHMAN C.A.; CARPENTER J.M.; CHESTER T.; CAMBRESY L.; EVANS T.; FOWLER J.; GIZIS J.; HOWARD E.; HUCHRA J.; JARRETT T.; KOPAN E.L.; KIRKPATRICK J.D.; LIGHT R.M.; MARSH K.A.; McCALLON H.; SCHNEIDER S.; STIENING R.; SYKES M.; WEINBERG M.; WHEATON W.A.; WHEELOCK S.; ZACARIAS N.
Discovery Paper - Title 2MASS All Sky Catalog of point sources.
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-20+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HAT-P-20%20b/
HAT-P-20 b
HAT-P-20 b

  • HAT-P-20 b is an exoplanet orbiting the star HAT-P-20, located about 228.3 light-years (70.0 pc) away from Solar System. Its discovery was publicly announced on 2010.
  • The host star HAT-P-20 has apparent magnitude of 11.3, 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 4595 with its spectral types of K7
  • In this planetary system, the extrasolar planet HAT-P-20 b orbits around the star HAT-P-20 every 2.9 days with its orbital distance of 0.04 AU ( 5400483.1 km)
  • (Projected orbit of HAT-P-20 b around its host star HAT-P-20)


  • The Star HAT-P-20 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.317 AU ( 47488517.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.439 AU ( 65641541.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.669 AU ( 100023183.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.984 AU ( 147188495.9 km)
  • Radiation at Planetary Boundary of HAT-P-20 b : 202046.54 W/m2

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



  • Kopparapu Recent Venus for Star HAT-P-20 distance : 0.349 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-20 distance : 0.442 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-20 distance : 0.427 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-20 distance : 0.469 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-20 distance : 0.816 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-20 distance : 0.860 AU

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



  • Original Kopparapu Recent Venus for Star HAT-P-20 distance : 0.345 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-20 distance : 0.456 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-20 distance : 0.456 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-20 distance : 0.829 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-20 distance : 0.862 AU

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



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



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