Imaginary Picture of HD 157172 b

Display orbital revolution of HD 157172 b around the hoststar HD 157172
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Exoplanet Name : HD 157172 b
Alternate Name :
Radius (Rjup / Re): 0.2675 (Rjup) 2.9979 (Rearth)
Mass (Mjup / Me): 0.1200 (Mjup) 38.1526 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.4160 (AU) 0.4160 (AU Est.)
Eccentricity : 0.4600
Orbital Period(Yrs) 0.2870
Orbital Period(Observed/Estimated) 104.84 (Days Obs.) 151.22 (Days Est.)
Star Radiation at Atmospheric Boundary: 4028.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 355.6 (K)
Blackbody T 0.3(K) 333.9 (K)
Blackbody T 0.7(K) 270.2 (K)
Tidally Locked Blackbody T 0.1(K) 422.8 (K)
Tidally Locked Blackbody T 0.3(K) 397.1 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 157172
Alternate Name :
Star Distance(LY) : 108.1
Stellar Radius(Rsun) : 0.8 (Rsun Estimated)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5440 (K)
Spectral type : G8.5V
Metalicity : 0.0
Absolute Magnitude: 5.3
Apparent Magnitude: 7.9
Right Ascension(RA) 260.6440
Declination (DEC) -19.6161
Hubble Space Telescope Guide Star Catalog (GSC) ID 06242-00625
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+157172+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20157172%20b/
HD 157172 b
HD 157172 b

  • HD 157172 b is an exoplanet orbiting the star HD 157172, located about 108.1 light-years (33.1 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star HD 157172 has apparent magnitude of 7.9, with absolute magnitude of 5.3.
  • It is 0.4 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5440 with its spectral types of G8.5V
  • In this planetary system, the extrasolar planet HD 157172 b orbits around the star HD 157172 every 104.8 days with its orbital distance of 0.42 AU ( 62232714.2 km)
  • (Projected orbit of HD 157172 b around its host star HD 157172)


  • The Star HD 157172 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.517 AU ( 77267751.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.714 AU ( 106804225.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.088 AU ( 162746003.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.601 AU ( 239487873.8 km)
  • Radiation at Planetary Boundary of HD 157172 b : 4028.08 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 157172)



  • Kopparapu Recent Venus for Star HD 157172 distance : 0.546 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 157172 distance : 0.691 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 157172 distance : 0.668 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 157172 distance : 0.732 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 157172 distance : 1.233 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 157172 distance : 1.301 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 157172)



  • Original Kopparapu Recent Venus for Star HD 157172 distance : 0.543 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 157172 distance : 0.711 AU
  • Original Kopparapu Moist Greenhouse for Star HD 157172 distance : 0.719 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 157172 distance : 1.255 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 157172 distance : 1.305 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 157172)



    (Position in Stellar Map of star HD 157172 and its Exoplanet HD 157172 b)



    (Zoomed position in Stellar Map of star HD 157172 and its Exoplanet HD 157172 b (zoom level 3))