Imaginary Picture of HD 11505 Ab

Display orbital revolution of HD 11505 Ab around the hoststar HD 11505 A
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Exoplanet Name : HD 11505 Ab
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 7.8990 (Mjup) 2511.3923 (Mearth)
Semi Major Axis / Orbital Distance Calculated 20.2470 (AU) 20.2470 (AU Est.)
Eccentricity : 0.1440
Orbital Period(Yrs) 89.4409
Orbital Period(Observed/Estimated) 32669.20 (Days Obs.) 32787.83 (Days Est.)
Surface Gravity (G Earth) 24.2534
Star Radiation at Atmospheric Boundary: 4.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 65.7 (K)
Blackbody T 0.3(K) 61.7 (K)
Blackbody T 0.7(K) 49.9 (K)
Tidally Locked Blackbody T 0.1(K) 78.1 (K)
Tidally Locked Blackbody T 0.3(K) 73.4 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : "Radial Velocity, Astrometry"
Mass Detection : Astrometry
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 11505 A
Alternate Name : LLO 4
Star Distance(LY) : 127.1
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5757 (K)
Spectral type : G2V
UV portion[%]: 7.8
Visible portion[%]: 44.7
IR portion[%]: 47.5
Metalicity : -0.2
Absolute Magnitude: 4.5
Apparent Magnitude: 7.4
Right Ascension(RA) 28.2758
Declination (DEC) -1.3269
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
HD 11505 Ab
HD 11505 Ab

  • HD 11505 Ab is an exoplanet orbiting the star HD 11505 A, located about 127.1 light-years (39.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star HD 11505 A has apparent magnitude of 7.4, with absolute magnitude of 4.5.
  • It is 1.0 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5757 with its spectral types of G2V
  • In this planetary system, the extrasolar planet HD 11505 Ab orbits around the star HD 11505 A every 32669.2 days with its orbital distance of 20.25 AU ( 3028908088.1 km)
  • (Projected orbit of HD 11505 Ab around its host star HD 11505 A)


  • The Star HD 11505 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.858 AU ( 128356680.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.186 AU ( 177422475.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.807 AU ( 270352589.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.659 AU ( 397835679.2 km)
  • Radiation at Planetary Boundary of HD 11505 Ab : 4.69 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 11505 A)



  • Kopparapu Recent Venus for Star HD 11505 A distance : 0.890 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 11505 A distance : 1.128 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 11505 A distance : 1.089 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 11505 A distance : 1.194 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 11505 A distance : 1.992 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 11505 A distance : 2.101 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 11505 A)



  • Original Kopparapu Recent Venus for Star HD 11505 A distance : 0.891 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 11505 A distance : 1.159 AU
  • Original Kopparapu Moist Greenhouse for Star HD 11505 A distance : 1.179 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 11505 A distance : 2.027 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 11505 A distance : 2.108 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 11505 A)



    (Position in Stellar Map of star HD 11505 A and its Exoplanet HD 11505 Ab)



    (Zoomed position in Stellar Map of star HD 11505 A and its Exoplanet HD 11505 Ab (zoom level 3))

    (Synthetic Spectrum of star HD 11505 A*)
    *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