Imaginary Picture of HD 23472 c

Display orbital revolution of HD 23472 c around the hoststar HD 23472
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Exoplanet Name : HD 23472 c
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1917 (Rjup) 2.1490 (Rearth)
Mass (Mjup / Me): 0.0541 (Mjup) 17.1845 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1700 (AU) 0.1700 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0811
Orbital Period(Observed/Estimated) 29.62 (Days Obs.) 29.56 (Days Est.)
Surface Gravity (G Earth) 3.7211
Star Radiation at Atmospheric Boundary: 12003.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 467.2 (K)
Blackbody T 0.3(K) 438.7 (K)
Blackbody T 0.7(K) 355.0 (K)
Tidally Locked Blackbody T 0.1(K) 555.6 (K)
Tidally Locked Blackbody T 0.3(K) 521.7 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 23472
Alternate Name :
Star Distance(LY) : 127.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4800 (K)
Spectral type : K3.5V
UV portion[%]: 2.4
Visible portion[%]: 35.4
IR portion[%]: 62.1
Metalicity : 0.0
Absolute Magnitude: 6.8
Apparent Magnitude: 9.7
Right Ascension(RA) 55.4600
Declination (DEC) -62.7671
Hubble Space Telescope Guide Star Catalog (GSC) ID 08870-00252
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+23472+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 23472 c
HD 23472 c

  • HD 23472 c is an exoplanet orbiting the star HD 23472, located about 127.5 light-years (39.1 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star HD 23472 has apparent magnitude of 9.7, with absolute magnitude of 6.8.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4800 with its spectral types of K3.5V
  • In this planetary system, the extrasolar planet HD 23472 c orbits around the star HD 23472 every 29.6 days with its orbital distance of 0.17 AU ( 25431638.0 km)
  • (Projected orbit of HD 23472 c around its host star HD 23472)


  • The Star HD 23472 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.364 AU ( 54508401.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.504 AU ( 75344855.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.767 AU ( 114808886.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.129 AU ( 168946305.9 km)
  • Radiation at Planetary Boundary of HD 23472 c : 12003.77 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 23472)



  • Kopparapu Recent Venus for Star HD 23472 distance : 0.398 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 23472 distance : 0.504 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 23472 distance : 0.486 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 23472 distance : 0.534 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 23472 distance : 0.920 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 23472 distance : 0.971 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 23472)



  • Original Kopparapu Recent Venus for Star HD 23472 distance : 0.393 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 23472 distance : 0.519 AU
  • Original Kopparapu Moist Greenhouse for Star HD 23472 distance : 0.520 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 23472 distance : 0.936 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 23472 distance : 0.973 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 23472)



    (Position in Stellar Map of star HD 23472 and its Exoplanet HD 23472 c)



    (Zoomed position in Stellar Map of star HD 23472 and its Exoplanet HD 23472 c (zoom level 3))

    (Synthetic Spectrum of star HD 23472*)
    *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