Imaginary Picture of HIP 38939 B

Display orbital revolution of HIP 38939 B around the hoststar HIP 38939 A
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Exoplanet Name : HIP 38939 B
Alternate Name : HD 65486 B
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 38.0000 (Mjup) 12081.6440 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1630.0000 (AU) 1630.0000 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 25197121.78 (Days Est.)
Surface Gravity (G Earth) 116.6765
Star Radiation at Atmospheric Boundary: 0.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 4.4 (K)
Blackbody T 0.3(K) 4.1 (K)
Blackbody T 0.7(K) 3.3 (K)
Tidally Locked Blackbody T 0.1(K) 5.2 (K)
Tidally Locked Blackbody T 0.3(K) 4.9 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Imaging
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HIP 38939 A
Alternate Name : "2MASS J07580434-2537356, HD 65486 A"
Star Distance(LY) : 60.3
Stellar Radius(Rsun) : 0.6 (Rsun Estimated)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.9 (GY)
Temperature : 4683 (K)
Spectral type : K4V
UV portion[%]: 2.1
Visible portion[%]: 33.9
IR portion[%]: 63.9
Metalicity : -0.3
Absolute Magnitude: 7.1
Apparent Magnitude: 8.4
Right Ascension(RA) 119.5182
Declination (DEC) -25.6266
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 38939 B
HIP 38939 B

  • HIP 38939 B is an exoplanet orbiting the star HIP 38939 A, located about 60.3 light-years (18.5 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star HIP 38939 A has apparent magnitude of 8.4, with absolute magnitude of 7.1.
  • It is 0.9 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4683 with its spectral types of K4V
  • (Projected orbit of HIP 38939 B around its host star HIP 38939 A)


  • The Star HIP 38939 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.307 AU ( 45903884.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.424 AU ( 63451164.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.646 AU ( 96685533.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.951 AU ( 142276997.9 km)
  • Radiation at Planetary Boundary of HIP 38939 B : 0.00 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HIP 38939 A)



  • Kopparapu Recent Venus for Star HIP 38939 A distance : 0.337 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HIP 38939 A distance : 0.426 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HIP 38939 A distance : 0.412 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HIP 38939 A distance : 0.452 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 38939 A distance : 0.783 AU
  • Kopparapu Outer Boundary for Early Mars for Star HIP 38939 A distance : 0.826 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HIP 38939 A)



  • Original Kopparapu Recent Venus for Star HIP 38939 A distance : 0.332 AU
  • Original Kopparapu Runaway Greenhouse for Star HIP 38939 A distance : 0.440 AU
  • Original Kopparapu Moist Greenhouse for Star HIP 38939 A distance : 0.440 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HIP 38939 A distance : 0.796 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HIP 38939 A distance : 0.827 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HIP 38939 A)



    (Position in Stellar Map of star HIP 38939 A and its Exoplanet HIP 38939 B)



    (Zoomed position in Stellar Map of star HIP 38939 A and its Exoplanet HIP 38939 B (zoom level 3))

    (Synthetic Spectrum of star HIP 38939 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