Imaginary Picture of HD 38858 b
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Exoplanet Name : HD 38858 b
Alternate Name :
Radius (Rjup / Re): 0.2541 (Rjup) 2.8486 (Rearth)
Mass (Mjup / Me): 0.0961 (Mjup) 30.5538 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.0376 (AU) 1.0376 (AU Est.)
Eccentricity : 0.2700
Orbital Period(Yrs) 1.1147
Orbital Period(Observed/Estimated) 407.15 (Days Obs.) 427.36 (Days Est.)
Star Radiation at Atmospheric Boundary: 1015.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 252.0 (K)
Blackbody T 0.3(K) 236.6 (K)
Blackbody T 0.7(K) 191.4 (K)
Tidally Locked Blackbody T 0.1(K) 299.6 (K)
Tidally Locked Blackbody T 0.3(K) 281.4 (K)
Size Class: sub-Neptune-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 38858
Alternate Name :
Star Distance(LY) : 49.7
Stellar Radius(Rsun) : 0.9 (Rsun Estimated)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5700 (K)
Spectral type : G4V
Metalicity : 0.0
Absolute Magnitude: 5.1
Apparent Magnitude: 6.0
Right Ascension(RA) 87.1456
Declination (DEC) -4.0947
Hubble Space Telescope Guide Star Catalog (GSC) ID 04776-01306
Discovered by
Discovery Paper - Authors "Grant M. Kennedy, Luca Matr_, Maxime Marmier, Jane S. Greaves, Mark C. Wyatt, Geoffrey Bryden, Wayne Holland, Christophe Lovis, Brenda C. Matthews, Francesco Pepe, Bruce Sibthorpe, St_phane Udry"
Discovery Paper - Title Kuiper belt structure around nearby super-Earth host stars
Discovery Paper - Journal Mon Not R Astron Soc (2015) 449 (3): 3121-3136. DOI: https://doi.org/10.1093/mnras/stv511
Discovery Paper - URL https://academic.oup.com/mnras/article/449/3/3121/2893048/Kuiper-belt-structure-around-nearby-super-Earth
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+38858+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2038858%20b/
HD 38858 b
HD 38858 b

  • HD 38858 b is an exoplanet orbiting the star HD 38858, located about 49.7 light-years (15.2 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star HD 38858 has apparent magnitude of 6.0, with absolute magnitude of 5.1.
  • It is 0.8 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5700 with its spectral types of G4V
  • In this planetary system, the extrasolar planet HD 38858 b orbits around the star HD 38858 every 407.1 days with its orbital distance of 1.04 AU ( 155222750.6 km)
  • (Projected orbit of HD 38858 b around its host star HD 38858)


  • The Star HD 38858 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.647 AU ( 96773886.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.894 AU ( 133766800.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.363 AU ( 203831001.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.005 AU ( 299946248.0 km)
  • Radiation at Planetary Boundary of HD 38858 b : 1015.65 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 38858)



  • Kopparapu Recent Venus for Star HD 38858 distance : 0.674 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 38858 distance : 0.853 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 38858 distance : 0.824 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 38858 distance : 0.903 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 38858 distance : 1.510 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 38858 distance : 1.592 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 38858)



  • Original Kopparapu Recent Venus for Star HD 38858 distance : 0.673 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 38858 distance : 0.877 AU
  • Original Kopparapu Moist Greenhouse for Star HD 38858 distance : 0.891 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 38858 distance : 1.536 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 38858 distance : 1.597 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 38858)



    (Position in Stellar Map of star HD 38858 and its Exoplanet HD 38858 b)



    (Zoomed position in Stellar Map of star HD 38858 and its Exoplanet HD 38858 b (zoom level 3))