Imaginary Picture of HD 149026 b
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Exoplanet Name : HD 149026 b
Alternate Name :
Radius (Rjup / Re): 0.7180 (Rjup) 8.0481 (Rearth)
Mass (Mjup / Me): 0.3570 (Mjup) 113.5039 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0429 (AU) 0.0429 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0079
Orbital Period(Observed/Estimated) 2.88 (Days Obs.) 2.84 (Days Est.)
Star Radiation at Atmospheric Boundary: 2133986.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1705.8 (K)
Blackbody T 0.3(K) 1602.0 (K)
Blackbody T 0.7(K) 1296.2 (K)
Tidally Locked Blackbody T 0.1(K) 2028.6 (K)
Tidally Locked Blackbody T 0.3(K) 1905.1 (K)
Size Class: sub-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 149026
Alternate Name :
Star Distance(LY) : 257.3
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 2.0 (GY)
Temperature : 6147 (K)
Spectral type : G0 IV
Metalicity : 0.4
Absolute Magnitude: 3.7
Apparent Magnitude: 8.2
Right Ascension(RA) 247.6234
Declination (DEC) 38.3472
Hubble Space Telescope Guide Star Catalog (GSC) ID 03063-01587
Discovered by
Discovery Paper - Authors HOG E.; FABRICIUS C.; MAKAROV V.V.; URBAN S.; CORBIN T.; WYCOFF G.; BASTIAN U.; SCHWEKENDIEK P.; WICENEC A.
Discovery Paper - Title The Tycho-2 catalogue of the 2.5 million brightest stars.
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+149026+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20149026%20b/
HD 149026 b
HD 149026 b

  • HD 149026 b is an exoplanet orbiting the star HD 149026, located about 257.3 light-years (78.9 pc) away from Solar System. Its discovery was publicly announced on 2005.
  • The host star HD 149026 has apparent magnitude of 8.2, with absolute magnitude of 3.7.
  • It is 1.3 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 6147 with its spectral types of G0 IV
  • In this planetary system, the extrasolar planet HD 149026 b orbits around the star HD 149026 every 2.9 days with its orbital distance of 0.04 AU ( 6414756.7 km)
  • (Projected orbit of HD 149026 b around its host star HD 149026)


  • The Star HD 149026 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.225 AU ( 183318518.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.694 AU ( 253394099.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.581 AU ( 386116531.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.798 AU ( 568187391.1 km)
  • Radiation at Planetary Boundary of HD 149026 b : 2133986.71 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 149026)



  • Kopparapu Recent Venus for Star HD 149026 distance : 1.242 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 149026 distance : 1.573 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 149026 distance : 1.519 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 149026 distance : 1.665 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 149026 distance : 2.753 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 149026 distance : 2.904 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 149026)



  • Original Kopparapu Recent Venus for Star HD 149026 distance : 1.253 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 149026 distance : 1.614 AU
  • Original Kopparapu Moist Greenhouse for Star HD 149026 distance : 1.658 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 149026 distance : 2.803 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 149026 distance : 2.914 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 149026)



    (Position in Stellar Map of star HD 149026 and its Exoplanet HD 149026 b)



    (Zoomed position in Stellar Map of star HD 149026 and its Exoplanet HD 149026 b (zoom level 3))