Imaginary Picture of HD 109271 b
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Exoplanet Name : HD 109271 b
Alternate Name :
Radius (Rjup / Re): 0.2226 (Rjup) 2.4950 (Rearth)
Mass (Mjup / Me): 0.0540 (Mjup) 17.1687 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0790 (AU) 0.0790 (AU Est.)
Eccentricity : 0.2500
Orbital Period(Yrs) 0.0215
Orbital Period(Observed/Estimated) 7.85 (Days Obs.) 7.93 (Days Est.)
Star Radiation at Atmospheric Boundary: 233944.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 981.6 (K)
Blackbody T 0.3(K) 921.8 (K)
Blackbody T 0.7(K) 745.8 (K)
Tidally Locked Blackbody T 0.1(K) 1167.3 (K)
Tidally Locked Blackbody T 0.3(K) 1096.2 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 109271
Alternate Name :
Star Distance(LY) : 185.0
Stellar Radius(Rsun) : 1.0 (Rsun Estimated)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 7.3 (GY)
Temperature : 5783 (K)
Spectral type : G5V
Metalicity : 0.1
Absolute Magnitude: 4.3
Apparent Magnitude: 8.1
Right Ascension(RA) 188.3981
Declination (DEC) -11.6219
Hubble Space Telescope Guide Star Catalog (GSC) ID 05530-01321
Discovered by
Discovery Paper - Authors "G. Lo Curto, M. Mayor, W. Benz, F. Bouchy, G. H¥¹¡£¥¹¥åebrard, C. Lovis, C. Moutou, D. Naef, F. Pepe, D. Queloz, N.C. Santos, D. Segransan, and S. Udry"
Discovery Paper - Title The HARPS search for southern extrasolar planets XXXIII. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone.
Discovery Paper - Journal "7 pages, 14 figures, accepted for publication by A&A, 04-01-2013"
Discovery Paper - URL https://arxiv.org/abs/1301.2741
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+109271+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20109271%20b/
HD 109271 b
HD 109271 b

  • HD 109271 b is an exoplanet orbiting the star HD 109271, located about 185.0 light-years (56.7 pc) away from Solar System. Its discovery was publicly announced on 2013.
  • The host star HD 109271 has apparent magnitude of 8.1, with absolute magnitude of 4.3.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5783 with its spectral types of G5V
  • In this planetary system, the extrasolar planet HD 109271 b orbits around the star HD 109271 every 7.9 days with its orbital distance of 0.08 AU ( 11818231.8 km)
  • (Projected orbit of HD 109271 b around its host star HD 109271)


  • The Star HD 109271 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.748 AU ( 111825052.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.033 AU ( 154571446.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.574 AU ( 235532677.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.317 AU ( 346596652.6 km)
  • Radiation at Planetary Boundary of HD 109271 b : 233944.38 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 109271)



  • Kopparapu Recent Venus for Star HD 109271 distance : 0.775 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 109271 distance : 0.981 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 109271 distance : 0.947 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 109271 distance : 1.039 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 109271 distance : 1.732 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 109271 distance : 1.827 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 109271)



  • Original Kopparapu Recent Venus for Star HD 109271 distance : 0.776 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 109271 distance : 1.008 AU
  • Original Kopparapu Moist Greenhouse for Star HD 109271 distance : 1.026 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 109271 distance : 1.762 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 109271 distance : 1.833 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 109271)



    (Position in Stellar Map of star HD 109271 and its Exoplanet HD 109271 b)



    (Zoomed position in Stellar Map of star HD 109271 and its Exoplanet HD 109271 b (zoom level 3))