Imaginary Picture of 4 Uma b
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Exoplanet Name : 4 Uma b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 7.1000 (Mjup) 2257.3598 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.8700 (AU) 0.8700 (AU Est.)
Eccentricity : 0.4320
Orbital Period(Yrs) 0.7373
Orbital Period(Observed/Estimated) 269.30 (Days Obs.) 266.82 (Days Est.)
Star Radiation at Atmospheric Boundary: 825.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 239.2 (K)
Blackbody T 0.3(K) 224.7 (K)
Blackbody T 0.7(K) 181.8 (K)
Tidally Locked Blackbody T 0.1(K) 284.5 (K)
Tidally Locked Blackbody T 0.3(K) 267.2 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : 4 Uma
Alternate Name :
Star Distance(LY) : 256.0
Stellar Radius(Rsun) : 1.2 (Rsun Estimated)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 4.6 (GY)
Temperature : 4415 (K)
Spectral type : K1III
Metalicity : -0.2
Absolute Magnitude: 1.3
Apparent Magnitude: 5.8
Right Ascension(RA) 130.0534
Declination (DEC) 64.3281
Hubble Space Telescope Guide Star Catalog (GSC) ID 04130-02355
Discovered by
Discovery Paper - Authors "D_llinger,..; Hatzes,..; Pasquini,.; Guenther,..; Hartmann,.; Girardi,.; Esposito,."
Discovery Paper - Title Discovery of a planet around the K giant star 4 Ursae Majoris
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+Uma+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/4%20UMa%20b/
4 Uma b
4 Uma b

  • 4 Uma b is an exoplanet orbiting the star 4 Uma, located about 256.0 light-years (78.5 pc) away from Solar System. Its discovery was publicly announced on 2007.
  • The host star 4 Uma has apparent magnitude of 5.8, with absolute magnitude of 1.3.
  • It is 1.2 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 4415 with its spectral types of K1III
  • In this planetary system, the extrasolar planet 4 Uma b orbits around the star 4 Uma every 269.3 days with its orbital distance of 0.87 AU ( 130150147.5 km)
  • (Projected orbit of 4 Uma b around its host star 4 Uma)


  • The Star 4 Uma 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.489 AU ( 73157123.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.676 AU ( 101122262.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.030 AU ( 154087950.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.516 AU ( 226747169.2 km)
  • Radiation at Planetary Boundary of 4 Uma b : 825.59 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 4 Uma)



  • Kopparapu Recent Venus for Star 4 Uma distance : 0.542 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 4 Uma distance : 0.686 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 4 Uma distance : 0.662 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 4 Uma distance : 0.727 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 4 Uma distance : 1.275 AU
  • Kopparapu Outer Boundary for Early Mars for Star 4 Uma distance : 1.345 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 4 Uma)



  • Original Kopparapu Recent Venus for Star 4 Uma distance : 0.534 AU
  • Original Kopparapu Runaway Greenhouse for Star 4 Uma distance : 0.708 AU
  • Original Kopparapu Moist Greenhouse for Star 4 Uma distance : 0.707 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 4 Uma distance : 1.296 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 4 Uma distance : 1.348 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 4 Uma)



    (Position in Stellar Map of star 4 Uma and its Exoplanet 4 Uma b)



    (Zoomed position in Stellar Map of star 4 Uma and its Exoplanet 4 Uma b (zoom level 3))