Imaginary Picture of HAT-P-18 b

Display orbital revolution of HAT-P-18 b around the hoststar HAT-P-18
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Exoplanet Name : HAT-P-18 b
Alternate Name : HAT-18b
Status : Confirmed
Radius (Rjup / Re): 0.9470 (Rjup) 10.6149 (Rearth)
Mass (Mjup / Me): 0.1830 (Mjup) 58.1827 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0559 (AU) 0.0559 (AU Est.)
Eccentricity : 0.1060
Orbital Period(Yrs) 0.0151
Orbital Period(Observed/Estimated) 5.51 (Days Obs.) 5.50 (Days Est.)
Surface Gravity (G Earth) 0.5164
Star Radiation at Atmospheric Boundary: 113484.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 819.2 (K)
Blackbody T 0.3(K) 769.3 (K)
Blackbody T 0.7(K) 622.4 (K)
Tidally Locked Blackbody T 0.1(K) 974.2 (K)
Tidally Locked Blackbody T 0.3(K) 914.8 (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-18
Alternate Name :
Star Distance(LY) : 527.2
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 12.4 (GY)
Temperature : 4870 (K)
Spectral type : K
UV portion[%]: 2.7
Visible portion[%]: 35.9
IR portion[%]: 61.4
Metalicity : 0.1
Absolute Magnitude: 6.7
Apparent Magnitude: 12.8
Right Ascension(RA) 256.3465
Declination (DEC) 33.0125
Hubble Space Telescope Guide Star Catalog (GSC) ID 02594-00646
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-18+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HAT-P-18%20b/
HAT-P-18 b
HAT-P-18 b
  • HAT-P-18 b is an exoplanet orbiting the star HAT-P-18, located about 527.2 light-years (161.6 pc) away from Solar System. Its discovery was publicly announced on 2010.
  • The host star HAT-P-18 has apparent magnitude of 12.8, with absolute magnitude of 6.7.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4870 with its spectral types of K
  • In this planetary system, the extrasolar planet HAT-P-18 b orbits around the star HAT-P-18 every 5.5 days with its orbital distance of 0.06 AU ( 8362521.0 km)
    • (Projected orbit of HAT-P-18 b around its host star HAT-P-18)


  • The Star HAT-P-18 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.368 AU ( 55110606.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.509 AU ( 76177260.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.776 AU ( 116077286.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.142 AU ( 170812812.4 km)
  • Radiation at Planetary Boundary of HAT-P-18 b : 113484.19 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-18)



  • Kopparapu Recent Venus for Star HAT-P-18 distance : 0.401 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-18 distance : 0.508 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-18 distance : 0.490 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-18 distance : 0.538 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-18 distance : 0.925 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-18 distance : 0.976 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-18)



  • Original Kopparapu Recent Venus for Star HAT-P-18 distance : 0.396 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-18 distance : 0.523 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-18 distance : 0.524 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-18 distance : 0.940 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-18 distance : 0.978 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-18)



    (Position in Stellar Map of star HAT-P-18 and its Exoplanet HAT-P-18 b)



    (Zoomed position in Stellar Map of star HAT-P-18 and its Exoplanet HAT-P-18 b (zoom level 3))

    (Synthetic Spectrum of star HAT-P-18*)
    *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