Imaginary Picture of HD 11231 b
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Exoplanet Name : HD 11231 b
Alternate Name : DMPP-2 b
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 0.4340 (Mjup) 137.9851 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0664 (AU) 0.0664 (AU Est.)
Eccentricity : 0.0830
Orbital Period(Yrs) 0.0142
Orbital Period(Observed/Estimated) 5.20 (Days Obs.) 5.21 (Days Est.)
Star Radiation at Atmospheric Boundary: 1573120.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1580.6 (K)
Blackbody T 0.3(K) 1484.4 (K)
Blackbody T 0.7(K) 1201.0 (K)
Tidally Locked Blackbody T 0.1(K) 1879.7 (K)
Tidally Locked Blackbody T 0.3(K) 1765.2 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Spectrum
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 11231
Alternate Name :
Star Distance(LY) : 451.7
Stellar Radius(Rsun) : 1.8 (Rsun Measured)
Stellar Mass(Msun) : 1.4 (Msun Measured) 1.4 (Msun Estimated)
Star Age : 2.0 (GY)
Temperature : 6500 (K)
Spectral type : F5V
Metalicity : 0.0
Absolute Magnitude: 2.9
Apparent Magnitude: 8.6
Right Ascension(RA) 27.4079
Declination (DEC) -34.4592
Hubble Space Telescope Guide Star Catalog (GSC) ID 07008-00587
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=HD+11231+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 11231 b
HD 11231 b

  • HD 11231 b is an exoplanet orbiting the star HD 11231, located about 451.7 light-years (138.5 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star HD 11231 has apparent magnitude of 8.6, with absolute magnitude of 2.9.
  • It is 1.4 times more massive and 1.8 times bigger compared with our Sun. The surface temperature is 6500 with its spectral types of F5V
  • In this planetary system, the extrasolar planet HD 11231 b orbits around the star HD 11231 every 5.2 days with its orbital distance of 0.07 AU ( 9933298.6 km)
  • (Projected orbit of HD 11231 b around its host star HD 11231)


  • The Star HD 11231 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.629 AU ( 243727665.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.252 AU ( 336895326.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.432 AU ( 513353923.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 5.050 AU ( 755422786.8 km)
  • Radiation at Planetary Boundary of HD 11231 b : 1573120.83 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 11231)



  • Kopparapu Recent Venus for Star HD 11231 distance : 1.617 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 11231 distance : 2.048 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 11231 distance : 1.977 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 11231 distance : 2.166 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 11231 distance : 3.562 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 11231 distance : 3.757 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 11231)



  • Original Kopparapu Recent Venus for Star HD 11231 distance : 1.644 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 11231 distance : 2.099 AU
  • Original Kopparapu Moist Greenhouse for Star HD 11231 distance : 2.176 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 11231 distance : 3.627 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 11231 distance : 3.771 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 11231)



    (Position in Stellar Map of star HD 11231 and its Exoplanet HD 11231 b)



    (Zoomed position in Stellar Map of star HD 11231 and its Exoplanet HD 11231 b (zoom level 3))