Imaginary Picture of HD 204941 b

Display orbital revolution of HD 204941 b around the hoststar HD 204941
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Exoplanet Name : HD 204941 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 0.2660 (Mjup) 84.5715 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.5600 (AU) 2.5600 (AU Est.)
Eccentricity : 0.3700
Orbital Period(Yrs) 4.7446
Orbital Period(Observed/Estimated) 1733.00 (Days Obs.) 1739.14 (Days Est.)
Surface Gravity (G Earth) 0.8167
Star Radiation at Atmospheric Boundary: 63.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 125.9 (K)
Blackbody T 0.3(K) 118.3 (K)
Blackbody T 0.7(K) 95.7 (K)
Tidally Locked Blackbody T 0.1(K) 149.8 (K)
Tidally Locked Blackbody T 0.3(K) 140.6 (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 : HD 204941
Alternate Name :
Star Distance(LY) : 87.7
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 6.7 (GY)
Temperature : 5056 (K)
Spectral type : K1
UV portion[%]: 3.6
Visible portion[%]: 37.8
IR portion[%]: 58.6
Metalicity : -0.2
Absolute Magnitude: 6.3
Apparent Magnitude: 8.4
Right Ascension(RA) 323.0980
Declination (DEC) -20.9575
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+204941+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20204941%20b/
HD 204941 b
HD 204941 b

  • HD 204941 b is an exoplanet orbiting the star HD 204941, located about 87.7 light-years (26.9 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star HD 204941 has apparent magnitude of 8.4, with absolute magnitude of 6.3.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 5056 with its spectral types of K1
  • In this planetary system, the extrasolar planet HD 204941 b orbits around the star HD 204941 every 1733.0 days with its orbital distance of 2.56 AU ( 382970549.0 km)
  • (Projected orbit of HD 204941 b around its host star HD 204941)


  • The Star HD 204941 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.399 AU ( 59649215.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.551 AU ( 82450804.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.840 AU ( 125636779.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.236 AU ( 184880025.5 km)
  • Radiation at Planetary Boundary of HD 204941 b : 63.39 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 204941)



  • Kopparapu Recent Venus for Star HD 204941 distance : 0.430 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 204941 distance : 0.545 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 204941 distance : 0.526 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 204941 distance : 0.577 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 204941 distance : 0.985 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 204941 distance : 1.039 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 204941)



  • Original Kopparapu Recent Venus for Star HD 204941 distance : 0.426 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 204941 distance : 0.561 AU
  • Original Kopparapu Moist Greenhouse for Star HD 204941 distance : 0.564 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 204941 distance : 1.002 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 204941 distance : 1.042 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 204941)



    (Position in Stellar Map of star HD 204941 and its Exoplanet HD 204941 b)



    (Zoomed position in Stellar Map of star HD 204941 and its Exoplanet HD 204941 b (zoom level 3))

    (Synthetic Spectrum of star HD 204941*)
    *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