Imaginary Picture of HD 11977 b
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Exoplanet Name : HD 11977 b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 6.2900 (Mjup) 1999.8300 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.8900 (AU) 1.8900 (AU Est.)
Eccentricity : 0.4000
Orbital Period(Yrs) 1.9466
Orbital Period(Observed/Estimated) 711.00 (Days Obs.) 686.70 (Days Est.)
Star Radiation at Atmospheric Boundary: 35541.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 612.8 (K)
Blackbody T 0.3(K) 575.5 (K)
Blackbody T 0.7(K) 465.6 (K)
Tidally Locked Blackbody T 0.1(K) 728.8 (K)
Tidally Locked Blackbody T 0.3(K) 684.4 (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 11977
Alternate Name :
Star Distance(LY) : 218.7
Stellar Radius(Rsun) : 13.0 (Rsun Measured)
Stellar Mass(Msun) : 1.9 (Msun Measured) 1.8 (Msun Estimated)
Star Age : 1.2 (GY)
Temperature : 4975 (K)
Spectral type : G8.5 III
Metalicity : -0.2
Absolute Magnitude: 0.6
Apparent Magnitude: 4.7
Right Ascension(RA) 28.7339
Declination (DEC) -67.6472
Hubble Space Telescope Guide Star Catalog (GSC) ID 09143-00238
Discovered by
Discovery Paper - Authors "M. G. Soto, J. S. Jenkins, M. I. Jones"
Discovery Paper - Title RAFT I: Discovery of new planetary candidates and updated orbits from archival FEROS spectra
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+11977+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2011977%20b/
HD 11977 b
HD 11977 b

  • HD 11977 b is an exoplanet orbiting the star HD 11977, located about 218.7 light-years (67.1 pc) away from Solar System. Its discovery was publicly announced on 2005.
  • The host star HD 11977 has apparent magnitude of 4.7, with absolute magnitude of 0.6.
  • It is 1.9 times more massive and 13.0 times bigger compared with our Sun. The surface temperature is 4975 with its spectral types of G8.5 III
  • In this planetary system, the extrasolar planet HD 11977 b orbits around the star HD 11977 every 711.0 days with its orbital distance of 1.89 AU ( 282739975.6 km)
  • (Projected orbit of HD 11977 b around its host star HD 11977)


  • The Star HD 11977 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 6.970 AU ( 1042767855.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 9.635 AU ( 1441377683.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 14.682 AU ( 2196340613.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 21.605 AU ( 3232011428.5 km)
  • Radiation at Planetary Boundary of HD 11977 b : 35541.87 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 11977)



  • Kopparapu Recent Venus for Star HD 11977 distance : 7.549 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 11977 distance : 9.558 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 11977 distance : 9.232 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 11977 distance : 10.132 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 11977 distance : 17.342 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 11977 distance : 18.292 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 11977)



  • Original Kopparapu Recent Venus for Star HD 11977 distance : 7.468 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 11977 distance : 9.851 AU
  • Original Kopparapu Moist Greenhouse for Star HD 11977 distance : 9.882 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 11977 distance : 17.632 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 11977 distance : 18.337 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 11977)



    (Position in Stellar Map of star HD 11977 and its Exoplanet HD 11977 b)



    (Zoomed position in Stellar Map of star HD 11977 and its Exoplanet HD 11977 b (zoom level 3))