Imaginary Picture of 8 Umi b

Display orbital revolution of 8 Umi b around the hoststar 8 Umi
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Exoplanet Name : 8 Umi b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.5000 (Mjup) 476.9070 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.4900 (AU) 0.4900 (AU Est.)
Eccentricity : 0.0600
Orbital Period(Yrs) 0.2557
Orbital Period(Observed/Estimated) 93.40 (Days Obs.) 93.38 (Days Est.)
Surface Gravity (G Earth) 4.6056
Star Radiation at Atmospheric Boundary: 276296.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1023.3 (K)
Blackbody T 0.3(K) 960.9 (K)
Blackbody T 0.7(K) 777.5 (K)
Tidally Locked Blackbody T 0.1(K) 1216.9 (K)
Tidally Locked Blackbody T 0.3(K) 1142.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : 8 Umi
Alternate Name :
Star Distance(LY) : 531.2
Stellar Radius(Rsun) : 9.9 (Rsun Measured)
Stellar Mass(Msun) : 1.8 (Msun Measured) 1.8 (Msun Estimated)
Star Age : 1.7 (GY)
Temperature : 4847 (K)
Spectral type : K0
UV portion[%]: 2.6
Visible portion[%]: 35.7
IR portion[%]: 61.7
Metalicity : -0.0
Absolute Magnitude: 0.8
Apparent Magnitude: 6.8
Right Ascension(RA) 224.2000
Declination (DEC) 74.9008
Hubble Space Telescope Guide Star Catalog (GSC) ID 04417-00267
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title 0
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=8+Umi+&submit=SIMBAD+search
Open Exoplanet Database Link 0
8 Umi b
8 Umi b

  • 8 Umi b is an exoplanet orbiting the star 8 Umi, located about 531.2 light-years (162.9 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star 8 Umi has apparent magnitude of 6.8, with absolute magnitude of 0.8.
  • It is 1.8 times more massive and 9.9 times bigger compared with our Sun. The surface temperature is 4847 with its spectral types of K0
  • In this planetary system, the extrasolar planet 8 Umi b orbits around the star 8 Umi every 93.4 days with its orbital distance of 0.49 AU ( 73302956.6 km)
  • (Projected orbit of 8 Umi b around its host star 8 Umi)


  • The Star 8 Umi 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 5.039 AU ( 753770864.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 6.965 AU ( 1041908318.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 10.613 AU ( 1587637703.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 15.617 AU ( 2336278430.2 km)
  • Radiation at Planetary Boundary of 8 Umi b : 276296.33 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 8 Umi)



  • Kopparapu Recent Venus for Star 8 Umi distance : 5.489 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 8 Umi distance : 6.950 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 8 Umi distance : 6.712 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 8 Umi distance : 7.368 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 8 Umi distance : 12.675 AU
  • Kopparapu Outer Boundary for Early Mars for Star 8 Umi distance : 13.370 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 8 Umi)



  • Original Kopparapu Recent Venus for Star 8 Umi distance : 5.424 AU
  • Original Kopparapu Runaway Greenhouse for Star 8 Umi distance : 7.166 AU
  • Original Kopparapu Moist Greenhouse for Star 8 Umi distance : 7.177 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 8 Umi distance : 12.886 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 8 Umi distance : 13.401 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 8 Umi)



    (Position in Stellar Map of star 8 Umi and its Exoplanet 8 Umi b)



    (Zoomed position in Stellar Map of star 8 Umi and its Exoplanet 8 Umi b (zoom level 3))

    (Synthetic Spectrum of star 8 Umi*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102