Imaginary Picture of HD 4732 A c

Display orbital revolution of HD 4732 A c around the hoststar HD 4732 A
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Exoplanet Name : HD 4732 A c
Alternate Name : "HR 228 A c, HD 4732 c, HR 228 c"
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 2.3700 (Mjup) 753.5131 (Mearth)
Semi Major Axis / Orbital Distance Calculated 4.6000 (AU) 4.6000 (AU Est.)
Eccentricity : 0.2300
Orbital Period(Yrs) 7.4796
Orbital Period(Observed/Estimated) 2732.00 (Days Obs.) 2731.82 (Days Est.)
Surface Gravity (G Earth) 7.2769
Star Radiation at Atmospheric Boundary: 1022.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 252.4 (K)
Blackbody T 0.3(K) 237.0 (K)
Blackbody T 0.7(K) 191.7 (K)
Tidally Locked Blackbody T 0.1(K) 300.1 (K)
Tidally Locked Blackbody T 0.3(K) 281.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 4732 A
Alternate Name : HD 4732
Star Distance(LY) : 188.9
Stellar Radius(Rsun) : 5.4 (Rsun Measured)
Stellar Mass(Msun) : 1.7 (Msun Measured) 1.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4959 (K)
Spectral type : K0 IV
UV portion[%]: 3.0
Visible portion[%]: 36.6
IR portion[%]: 60.3
Metalicity : 0.0
Absolute Magnitude: 2.1
Apparent Magnitude: 5.9
Right Ascension(RA) 12.3081
Declination (DEC) -24.1367
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
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%204732%20c/
HD 4732 A c
HD 4732 A c

  • HD 4732 A c is an exoplanet orbiting the star HD 4732 A, located about 188.9 light-years (57.9 pc) away from Solar System. Its discovery was publicly announced on 2013.
  • The host star HD 4732 A has apparent magnitude of 5.9, with absolute magnitude of 2.1.
  • It is 1.7 times more massive and 5.4 times bigger compared with our Sun. The surface temperature is 4959 with its spectral types of K0 IV
  • In this planetary system, the extrasolar planet HD 4732 A c orbits around the star HD 4732 A every 2732.0 days with its orbital distance of 4.60 AU ( 688150205.2 km)
  • (Projected orbit of HD 4732 A c around its host star HD 4732 A)


  • The Star HD 4732 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.877 AU ( 430368115.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 3.977 AU ( 594881204.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 6.059 AU ( 906467309.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 8.917 AU ( 1333906355.3 km)
  • Radiation at Planetary Boundary of HD 4732 A c : 1022.01 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 4732 A)



  • Kopparapu Recent Venus for Star HD 4732 A distance : 3.118 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 4732 A distance : 3.948 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 4732 A distance : 3.813 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 4732 A distance : 4.185 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 4732 A distance : 7.167 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 4732 A distance : 7.560 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 4732 A)



  • Original Kopparapu Recent Venus for Star HD 4732 A distance : 3.084 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 4732 A distance : 4.069 AU
  • Original Kopparapu Moist Greenhouse for Star HD 4732 A distance : 4.081 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 4732 A distance : 7.287 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 4732 A distance : 7.578 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 4732 A)



    (Position in Stellar Map of star HD 4732 A and its Exoplanet HD 4732 A c)



    (Zoomed position in Stellar Map of star HD 4732 A and its Exoplanet HD 4732 A c (zoom level 3))

    (Synthetic Spectrum of star HD 4732 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