Imaginary Picture of HD 180777 b
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Exoplanet Name : HD 180777 b
Alternate Name : 59 Draconis b
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 25.0000 (Mjup) 7948.4500 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.2200 (AU) 0.2200 (AU Est.)
Eccentricity : 0.2000
Orbital Period(Yrs) 0.0779
Orbital Period(Observed/Estimated) 28.44 (Days Obs.) 28.91 (Days Est.)
Star Radiation at Atmospheric Boundary: 138189.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 860.5 (K)
Blackbody T 0.3(K) 808.1 (K)
Blackbody T 0.7(K) 653.9 (K)
Tidally Locked Blackbody T 0.1(K) 1023.3 (K)
Tidally Locked Blackbody T 0.3(K) 961.0 (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 180777
Alternate Name :
Star Distance(LY) : 89.0
Stellar Radius(Rsun) : 1.4 (Rsun Estimated)
Stellar Mass(Msun) : 1.7 (Msun Measured) 1.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 7250 (K)
Spectral type : A9V
Metalicity : 0.0
Absolute Magnitude: 2.9
Apparent Magnitude: 5.1
Right Ascension(RA) 287.2912
Declination (DEC) 76.5606
Hubble Space Telescope Guide Star Catalog (GSC) ID 04583-02836
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+180777+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 180777 b
HD 180777 b

  • HD 180777 b is an exoplanet orbiting the star HD 180777, located about 89.0 light-years (27.3 pc) away from Solar System. Its discovery was publicly announced on 2006.
  • The host star HD 180777 has apparent magnitude of 5.1, with absolute magnitude of 2.9.
  • It is 1.7 times more massive and 1.4 times bigger compared with our Sun. The surface temperature is 7250 with its spectral types of A9V
  • In this planetary system, the extrasolar planet HD 180777 b orbits around the star HD 180777 every 28.4 days with its orbital distance of 0.22 AU ( 32911531.6 km)
  • (Projected orbit of HD 180777 b around its host star HD 180777)


  • The Star HD 180777 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.600 AU ( 239340378.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.211 AU ( 330830950.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.370 AU ( 504113155.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.959 AU ( 741824592.1 km)
  • Radiation at Planetary Boundary of HD 180777 b : 138189.54 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 180777)



  • Kopparapu Recent Venus for Star HD 180777 distance : 1.529 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 180777 distance : 1.937 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 180777 distance : 1.870 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 180777 distance : 2.048 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 180777 distance : 3.344 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 180777 distance : 3.527 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 180777)



  • Original Kopparapu Recent Venus for Star HD 180777 distance : 1.579 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 180777 distance : 1.981 AU
  • Original Kopparapu Moist Greenhouse for Star HD 180777 distance : 2.089 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 180777 distance : 3.405 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 180777 distance : 3.541 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 180777)



    (Position in Stellar Map of star HD 180777 and its Exoplanet HD 180777 b)



    (Zoomed position in Stellar Map of star HD 180777 and its Exoplanet HD 180777 b (zoom level 3))