Imaginary Picture of HD 115404 Ac

Display orbital revolution of HD 115404 Ac around the hoststar HD 115404 A
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Exoplanet Name : HD 115404 Ac
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 10.3190 (Mjup) 3280.8022 (Mearth)
Semi Major Axis / Orbital Distance Calculated 11.3640 (AU) 11.3640 (AU Est.)
Eccentricity : 0.2110
Orbital Period(Yrs) 41.9405
Orbital Period(Observed/Estimated) 15319.20 (Days Obs.) 15358.47 (Days Est.)
Surface Gravity (G Earth) 31.6838
Star Radiation at Atmospheric Boundary: 3.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 59.6 (K)
Blackbody T 0.3(K) 56.0 (K)
Blackbody T 0.7(K) 45.3 (K)
Tidally Locked Blackbody T 0.1(K) 70.9 (K)
Tidally Locked Blackbody T 0.3(K) 66.6 (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 115404 A
Alternate Name : GJ 505 A
Star Distance(LY) : 35.8
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5019 (K)
Spectral type : K0V
UV portion[%]: 3.4
Visible portion[%]: 37.3
IR portion[%]: 59.3
Metalicity : -0.2
Absolute Magnitude: 6.5
Apparent Magnitude: 6.7
Right Ascension(RA) 199.2127
Declination (DEC) 17.0172
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 115404 Ac
HD 115404 Ac

  • HD 115404 Ac is an exoplanet orbiting the star HD 115404 A, located about 35.8 light-years (11.0 pc) away from Solar System. Its discovery was publicly announced on 2022.
  • The host star HD 115404 A has apparent magnitude of 6.7, with absolute magnitude of 6.5.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 5019 with its spectral types of K0V
  • In this planetary system, the extrasolar planet HD 115404 Ac orbits around the star HD 115404 A every 15319.2 days with its orbital distance of 11.36 AU ( 1700030202.6 km)
  • (Projected orbit of HD 115404 Ac around its host star HD 115404 A)


  • The Star HD 115404 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.397 AU ( 59350846.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.548 AU ( 82038379.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.836 AU ( 125008335.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.230 AU ( 183955241.8 km)
  • Radiation at Planetary Boundary of HD 115404 Ac : 3.18 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 115404 A)



  • Kopparapu Recent Venus for Star HD 115404 A distance : 0.429 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 115404 A distance : 0.543 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 115404 A distance : 0.524 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 115404 A distance : 0.575 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 115404 A distance : 0.983 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 115404 A distance : 1.037 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 115404 A)



  • Original Kopparapu Recent Venus for Star HD 115404 A distance : 0.424 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 115404 A distance : 0.559 AU
  • Original Kopparapu Moist Greenhouse for Star HD 115404 A distance : 0.561 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 115404 A distance : 1.000 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 115404 A distance : 1.040 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 115404 A)



    (Position in Stellar Map of star HD 115404 A and its Exoplanet HD 115404 Ac)



    (Zoomed position in Stellar Map of star HD 115404 A and its Exoplanet HD 115404 Ac (zoom level 3))

    (Synthetic Spectrum of star HD 115404 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