Imaginary Picture of HIP 56640 b

Display orbital revolution of HIP 56640 b around the hoststar HIP 56640
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Exoplanet Name : HIP 56640 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 6.7700 (Mjup) 2152.4403 (Mearth)
Semi Major Axis / Orbital Distance Calculated 4.5500 (AU) 4.5500 (AU Est.)
Eccentricity : 0.1180
Orbital Period(Yrs) 7.3252
Orbital Period(Observed/Estimated) 2675.60 (Days Obs.) 3476.09 (Days Est.)
Surface Gravity (G Earth) 20.7868
Star Radiation at Atmospheric Boundary: 744.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 233.2 (K)
Blackbody T 0.3(K) 219.0 (K)
Blackbody T 0.7(K) 177.2 (K)
Tidally Locked Blackbody T 0.1(K) 277.3 (K)
Tidally Locked Blackbody T 0.3(K) 260.4 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : "Radial Velocity, Astrometry"
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : HIP 56640
Alternate Name : HD 100939
Star Distance(LY) : 400.4
Stellar Radius(Rsun) : 4.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4769 (K)
Spectral type : K1III
UV portion[%]: 2.4
Visible portion[%]: 35.2
IR portion[%]: 62.5
Metalicity : -0.0
Absolute Magnitude: 2.5
Apparent Magnitude: 7.9
Right Ascension(RA) 174.1667
Declination (DEC) -37.0392
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
HIP 56640 b
HIP 56640 b

  • HIP 56640 b is an exoplanet orbiting the star HIP 56640, located about 400.4 light-years (122.8 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star HIP 56640 has apparent magnitude of 7.9, with absolute magnitude of 2.5.
  • It is 1.0 times more massive and 4.9 times bigger compared with our Sun. The surface temperature is 4769 with its spectral types of K1III
  • In this planetary system, the extrasolar planet HIP 56640 b orbits around the star HIP 56640 every 2675.6 days with its orbital distance of 4.55 AU ( 680670311.7 km)
  • (Projected orbit of HIP 56640 b around its host star HIP 56640)


  • The Star HIP 56640 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.429 AU ( 363378875.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 3.358 AU ( 502284568.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 5.116 AU ( 765370526.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 7.529 AU ( 1126276258.6 km)
  • Radiation at Planetary Boundary of HIP 56640 b : 744.71 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HIP 56640)



  • Kopparapu Recent Venus for Star HIP 56640 distance : 2.655 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HIP 56640 distance : 3.361 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HIP 56640 distance : 3.247 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HIP 56640 distance : 3.564 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 56640 distance : 6.151 AU
  • Kopparapu Outer Boundary for Early Mars for Star HIP 56640 distance : 6.489 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HIP 56640)



  • Original Kopparapu Recent Venus for Star HIP 56640 distance : 2.622 AU
  • Original Kopparapu Runaway Greenhouse for Star HIP 56640 distance : 3.467 AU
  • Original Kopparapu Moist Greenhouse for Star HIP 56640 distance : 3.470 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 56640 distance : 6.253 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HIP 56640 distance : 6.503 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HIP 56640)



    (Position in Stellar Map of star HIP 56640 and its Exoplanet HIP 56640 b)



    (Zoomed position in Stellar Map of star HIP 56640 and its Exoplanet HIP 56640 b (zoom level 3))

    (Synthetic Spectrum of star HIP 56640*)
    *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