Imaginary Picture of 11 UMi b
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Exoplanet Name : 11 UMi b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 10.5000 (Mjup) 3338.3490 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.5400 (AU) 1.5400 (AU Est.)
Eccentricity : 0.0800
Orbital Period(Yrs) 1.4133
Orbital Period(Observed/Estimated) 516.22 (Days Obs.) 520.28 (Days Est.)
Star Radiation at Atmospheric Boundary: 106373.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 806.0 (K)
Blackbody T 0.3(K) 756.9 (K)
Blackbody T 0.7(K) 612.5 (K)
Tidally Locked Blackbody T 0.1(K) 958.5 (K)
Tidally Locked Blackbody T 0.3(K) 900.2 (K)
Size Class: Jupiter-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 : 11 UMi
Alternate Name :
Star Distance(LY) : 398.2
Stellar Radius(Rsun) : 24.1 (Rsun Measured)
Stellar Mass(Msun) : 1.8 (Msun Measured) 1.8 (Msun Estimated)
Star Age : 1.6 (GY)
Temperature : 4340 (K)
Spectral type : K4III
Metalicity : 0.0
Absolute Magnitude: -0.4
Apparent Magnitude: 5.0
Right Ascension(RA) 229.2745
Declination (DEC) 71.8239
Hubble Space Telescope Guide Star Catalog (GSC) ID 04414-02315
Discovered by
Discovery Paper - Authors "D_llinger,..; Hatzes,..; Pasquini,.; Guenther,..; Hartmann,"
Discovery Paper - Title Planetary companions around the K giant stars 11 Ursae Minoris and HD 32518
Discovery Paper - Journal "A&A Volume 505, Number 3, October III 2009 "
Discovery Paper - URL http://www.aanda.org/articles/aa/full_html/2009/39/aa11702-09/aa11702-09.html
SIMBAD LINK http://simbad.harvard.edu/simbad/sim-basic?Ident=11+UMi+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/11%20UMi%20b/
11 UMi b
11 UMi b

  • 11 UMi b is an exoplanet orbiting the star 11 UMi, located about 398.2 light-years (122.1 pc) away from Solar System. Its discovery was publicly announced on 2009.
  • The host star 11 UMi has apparent magnitude of 5.0, with absolute magnitude of -0.4.
  • It is 1.8 times more massive and 24.1 times bigger compared with our Sun. The surface temperature is 4340 with its spectral types of K4III
  • In this planetary system, the extrasolar planet 11 UMi b orbits around the star 11 UMi every 516.2 days with its orbital distance of 1.54 AU ( 230380720.9 km)
  • (Projected orbit of 11 UMi b around its host star 11 UMi)


  • The Star 11 UMi 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 9.826 AU ( 1469921201.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 13.582 AU ( 2031815237.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 20.696 AU ( 3096036781.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 30.455 AU ( 4555953752.7 km)
  • Radiation at Planetary Boundary of 11 UMi b : 106373.94 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 11 UMi)



  • Kopparapu Recent Venus for Star 11 UMi distance : 10.910 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 11 UMi distance : 13.810 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 11 UMi distance : 13.339 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 11 UMi distance : 14.653 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 11 UMi distance : 25.774 AU
  • Kopparapu Outer Boundary for Early Mars for Star 11 UMi distance : 27.189 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 11 UMi)



  • Original Kopparapu Recent Venus for Star 11 UMi distance : 10.764 AU
  • Original Kopparapu Runaway Greenhouse for Star 11 UMi distance : 14.265 AU
  • Original Kopparapu Moist Greenhouse for Star 11 UMi distance : 14.243 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 11 UMi distance : 26.192 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 11 UMi distance : 27.239 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 11 UMi)



    (Position in Stellar Map of star 11 UMi and its Exoplanet 11 UMi b)



    (Zoomed position in Stellar Map of star 11 UMi and its Exoplanet 11 UMi b (zoom level 3))