Imaginary Picture of HAT-P-23 b
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Exoplanet Name : HAT-P-23 b
Alternate Name :
Radius (Rjup / Re): 1.3680 (Rjup) 15.3339 (Rearth)
Mass (Mjup / Me): 2.0900 (Mjup) 664.4904 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0232 (AU) 0.0232 (AU Est.)
Eccentricity : 0.1060
Orbital Period(Yrs) 0.0033
Orbital Period(Observed/Estimated) 1.21 (Days Obs.) 1.21 (Days Est.)
Star Radiation at Atmospheric Boundary: 4669479.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 2074.7 (K)
Blackbody T 0.3(K) 1948.4 (K)
Blackbody T 0.7(K) 1576.4 (K)
Tidally Locked Blackbody T 0.1(K) 2467.3 (K)
Tidally Locked Blackbody T 0.3(K) 2317.0 (K)
Size Class: Super-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-23
Alternate Name :
Star Distance(LY) : 991.4
Stellar Radius(Rsun) : 1.3 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 4.0 (GY)
Temperature : 5924 (K)
Spectral type : G5
Metalicity : 0.2
Absolute Magnitude: 4.5
Apparent Magnitude: 11.9
Right Ascension(RA) 306.1239
Declination (DEC) 16.7622
Hubble Space Telescope Guide Star Catalog (GSC) ID 01632-01396
Discovered by
Discovery Paper - Authors "G. _. Bakos, J. Hartman, G. Torres, D. W. Latham, G_za Kov_cs, R. W. Noyes, D. A. Fischer, J. A. Johnson, G. W. Marcy, A. W. Howard"
Discovery Paper - Title HAT-P-20b_HAT-P-23b: FOUR MASSIVE TRANSITING EXTRASOLAR PLANETS
Discovery Paper - Journal "The Astrophysical Journal,olume 742,umber 2"
Discovery Paper - URL http://iopscience.iop.org/article/10.1088/0004-637X/742/2/116/meta
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-23+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HAT-P-23%20b/
HAT-P-23 b
HAT-P-23 b

  • HAT-P-23 b is an exoplanet orbiting the star HAT-P-23, located about 991.4 light-years (304.0 pc) away from Solar System. Its discovery was publicly announced on 2010.
  • The host star HAT-P-23 has apparent magnitude of 11.9, with absolute magnitude of 4.5.
  • It is 1.1 times more massive and 1.3 times bigger compared with our Sun. The surface temperature is 5924 with its spectral types of G5
  • In this planetary system, the extrasolar planet HAT-P-23 b orbits around the star HAT-P-23 every 1.2 days with its orbital distance of 0.02 AU ( 3470670.6 km)
  • (Projected orbit of HAT-P-23 b around its host star HAT-P-23)


  • The Star HAT-P-23 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.981 AU ( 146716150.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.356 AU ( 202800061.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.066 AU ( 309022413.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.040 AU ( 454740018.7 km)
  • Radiation at Planetary Boundary of HAT-P-23 b : 4669479.37 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-23)



  • Kopparapu Recent Venus for Star HAT-P-23 distance : 1.008 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-23 distance : 1.276 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-23 distance : 1.232 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-23 distance : 1.351 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-23 distance : 2.245 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-23 distance : 2.368 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-23)



  • Original Kopparapu Recent Venus for Star HAT-P-23 distance : 1.012 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-23 distance : 1.310 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-23 distance : 1.339 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-23 distance : 2.285 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-23 distance : 2.376 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-23)



    (Position in Stellar Map of star HAT-P-23 and its Exoplanet HAT-P-23 b)



    (Zoomed position in Stellar Map of star HAT-P-23 and its Exoplanet HAT-P-23 b (zoom level 3))