Imaginary Picture of HAT-P-12 b

Display orbital revolution of HAT-P-12 b around the hoststar HAT-P-12
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Exoplanet Name : HAT-P-12 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9490 (Rjup) 10.6373 (Rearth)
Mass (Mjup / Me): 0.2105 (Mjup) 66.9227 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0384 (AU) 0.0384 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0088
Orbital Period(Observed/Estimated) 3.21 (Days Obs.) 3.22 (Days Est.)
Surface Gravity (G Earth) 0.5914
Star Radiation at Atmospheric Boundary: 190524.2 (W/m2)
Measured Temperature (K) 1000.0 (K)
Blackbody T 0.1(K) 932.5 (K)
Blackbody T 0.3(K) 875.7 (K)
Blackbody T 0.7(K) 708.5 (K)
Tidally Locked Blackbody T 0.1(K) 1108.9 (K)
Tidally Locked Blackbody T 0.3(K) 1041.4 (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-12
Alternate Name :
Star Distance(LY) : 467.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 2.5 (GY)
Temperature : 4650 (K)
Spectral type : K4
UV portion[%]: 2.0
Visible portion[%]: 33.5
IR portion[%]: 64.5
Metalicity : -0.3
Absolute Magnitude: 7.1
Apparent Magnitude: 12.8
Right Ascension(RA) 209.3894
Declination (DEC) 43.4936
Hubble Space Telescope Guide Star Catalog (GSC) ID 03033-00706
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-12+&submit=SIMBAD+search
Open Exoplanet Database Link
HAT-P-12 b
HAT-P-12 b

  • HAT-P-12 b is an exoplanet orbiting the star HAT-P-12, located about 467.5 light-years (143.3 pc) away from Solar System. Its discovery was publicly announced on 2009.
  • The host star HAT-P-12 has apparent magnitude of 12.8, with absolute magnitude of 7.1.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4650 with its spectral types of K4
  • In this planetary system, the extrasolar planet HAT-P-12 b orbits around the star HAT-P-12 every 3.2 days with its orbital distance of 0.04 AU ( 5744558.2 km)
  • (Projected orbit of HAT-P-12 b around its host star HAT-P-12)


  • The Star HAT-P-12 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.328 AU ( 49052603.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.453 AU ( 67803516.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.691 AU ( 103317554.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.016 AU ( 152036306.7 km)
  • Radiation at Planetary Boundary of HAT-P-12 b : 190524.25 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-12)



  • Kopparapu Recent Venus for Star HAT-P-12 distance : 0.360 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-12 distance : 0.456 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-12 distance : 0.440 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-12 distance : 0.484 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-12 distance : 0.839 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-12 distance : 0.885 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-12)



  • Original Kopparapu Recent Venus for Star HAT-P-12 distance : 0.355 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-12 distance : 0.470 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-12 distance : 0.470 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-12 distance : 0.853 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-12 distance : 0.887 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-12)



    (Position in Stellar Map of star HAT-P-12 and its Exoplanet HAT-P-12 b)



    (Zoomed position in Stellar Map of star HAT-P-12 and its Exoplanet HAT-P-12 b (zoom level 3))

    (Synthetic Spectrum of star HAT-P-12*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102