Imaginary Picture of HAT-P-42 b

Display orbital revolution of HAT-P-42 b around the hoststar HAT-P-42
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Exoplanet Name : HAT-P-42 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 1.2770 (Rjup) 14.3139 (Rearth)
Mass (Mjup / Me): 0.9750 (Mjup) 309.9896 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0575 (AU) 0.0575 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0127
Orbital Period(Observed/Estimated) 4.64 (Days Obs.) 4.64 (Days Est.)
Surface Gravity (G Earth) 1.5130
Star Radiation at Atmospheric Boundary: 942043.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1390.5 (K)
Blackbody T 0.3(K) 1305.8 (K)
Blackbody T 0.7(K) 1056.5 (K)
Tidally Locked Blackbody T 0.1(K) 1653.6 (K)
Tidally Locked Blackbody T 0.3(K) 1552.9 (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-42
Alternate Name :
Star Distance(LY) : 1457.9
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 5.1 (GY)
Temperature : 5743 (K)
Spectral type : G3
UV portion[%]: 7.7
Visible portion[%]: 44.6
IR portion[%]: 47.7
Metalicity : 0.3
Absolute Magnitude: 3.9
Apparent Magnitude: 12.2
Right Ascension(RA) 135.3444
Declination (DEC) 6.0972
Hubble Space Telescope Guide Star Catalog (GSC) ID 00232-01451
Discovered by
Discovery Paper - Authors "I. Boisse,. Hartman,. Bakos,. Penev,. Csubry,. Beky,. Latham,. Bieryla,. Torres,. Kovacs,. Buchhave,. Hansen,. Everett,. Esquerdo,. Szklenar,. Falco,. Shporer,. Fulton,. Noyes,. Stefanik,. Lazar,. Papp,. Sari"
Discovery Paper - Title HAT-P-42b and HAT-P-43b. Two Inflated Transiting Hot Jupiters from the HATNet Survey
Discovery Paper - Journal "A&A 558, A86 (2013)"
Discovery Paper - URL http://www.aanda.org/articles/aa/full_html/2013/10/aa20993-12/aa20993-12.html
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-42+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HAT-P-42%20b/
HAT-P-42 b
HAT-P-42 b

  • HAT-P-42 b is an exoplanet orbiting the star HAT-P-42, located about 1457.9 light-years (447.0 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star HAT-P-42 has apparent magnitude of 12.2, with absolute magnitude of 3.9.
  • It is 1.2 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 5743 with its spectral types of G3
  • In this planetary system, the extrasolar planet HAT-P-42 b orbits around the star HAT-P-42 every 4.6 days with its orbital distance of 0.06 AU ( 8601877.6 km)
  • (Projected orbit of HAT-P-42 b around its host star HAT-P-42)


  • The Star HAT-P-42 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.092 AU ( 163327419.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.509 AU ( 225761175.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.300 AU ( 344010070.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.384 AU ( 506225889.4 km)
  • Radiation at Planetary Boundary of HAT-P-42 b : 942043.80 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-42)



  • Kopparapu Recent Venus for Star HAT-P-42 distance : 1.134 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-42 distance : 1.436 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-42 distance : 1.387 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-42 distance : 1.521 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-42 distance : 2.538 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-42 distance : 2.677 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-42)



  • Original Kopparapu Recent Venus for Star HAT-P-42 distance : 1.135 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-42 distance : 1.476 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-42 distance : 1.501 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-42 distance : 2.583 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-42 distance : 2.686 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-42)



    (Position in Stellar Map of star HAT-P-42 and its Exoplanet HAT-P-42 b)



    (Zoomed position in Stellar Map of star HAT-P-42 and its Exoplanet HAT-P-42 b (zoom level 3))

    (Synthetic Spectrum of star HAT-P-42*)
    *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