Imaginary Picture of HD 187123 b
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Exoplanet Name : HD 187123 b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 0.5200 (Mjup) 165.3278 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0426 (AU) 0.0426 (AU Est.)
Eccentricity : 0.0100
Orbital Period(Yrs) 0.0085
Orbital Period(Observed/Estimated) 3.10 (Days Obs.) 3.12 (Days Est.)
Star Radiation at Atmospheric Boundary: 986093.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1406.4 (K)
Blackbody T 0.3(K) 1320.8 (K)
Blackbody T 0.7(K) 1068.7 (K)
Tidally Locked Blackbody T 0.1(K) 1672.6 (K)
Tidally Locked Blackbody T 0.3(K) 1570.7 (K)
Size Class: Jupiter-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 187123
Alternate Name :
Star Distance(LY) : 157.4
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 5.3 (GY)
Temperature : 5714 (K)
Spectral type : G5
Metalicity : 0.2
Absolute Magnitude: 4.4
Apparent Magnitude: 7.9
Right Ascension(RA) 296.7421
Declination (DEC) 34.4208
Hubble Space Telescope Guide Star Catalog (GSC) ID 02664-00550
Discovered by
Discovery Paper - Authors "Feng,.atherina; Wright,ason.; Nelson,enjamin; Wang,haron.; Ford,ric.; Marcy,eoffrey.; Isaacson,oward; Howard,ndrew."
Discovery Paper - Title The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets
Discovery Paper - Journal "The Astrophysical Journal,olume 800,umber 1"
Discovery Paper - URL http://iopscience.iop.org/article/10.1088/0004-637X/800/1/22/meta
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+187123+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20187123%20b/
HD 187123 b
HD 187123 b

  • HD 187123 b is an exoplanet orbiting the star HD 187123, located about 157.4 light-years (48.3 pc) away from Solar System. Its discovery was publicly announced on 1998.
  • The host star HD 187123 has apparent magnitude of 7.9, with absolute magnitude of 4.4.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5714 with its spectral types of G5
  • In this planetary system, the extrasolar planet HD 187123 b orbits around the star HD 187123 every 3.1 days with its orbital distance of 0.04 AU ( 6372869.3 km)
  • (Projected orbit of HD 187123 b around its host star HD 187123)


  • The Star HD 187123 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.828 AU ( 123801083.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.144 AU ( 171125450.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.743 AU ( 260757317.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.565 AU ( 383715815.0 km)
  • Radiation at Planetary Boundary of HD 187123 b : 986093.92 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 187123)



  • Kopparapu Recent Venus for Star HD 187123 distance : 0.861 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 187123 distance : 1.090 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 187123 distance : 1.053 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 187123 distance : 1.155 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 187123 distance : 1.929 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 187123 distance : 2.034 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 187123)



  • Original Kopparapu Recent Venus for Star HD 187123 distance : 0.861 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 187123 distance : 1.121 AU
  • Original Kopparapu Moist Greenhouse for Star HD 187123 distance : 1.139 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 187123 distance : 1.963 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 187123 distance : 2.041 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 187123)



    (Position in Stellar Map of star HD 187123 and its Exoplanet HD 187123 b)



    (Zoomed position in Stellar Map of star HD 187123 and its Exoplanet HD 187123 b (zoom level 3))