Imaginary Picture of 23 Lib b

Display orbital revolution of 23 Lib b around the hoststar 23 Lib
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Exoplanet Name : 23 Lib b
Alternate Name : HD 134987 b
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.5900 (Mjup) 505.5214 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.8100 (AU) 0.8100 (AU Est.)
Eccentricity : 0.2330
Orbital Period(Yrs) 0.7069
Orbital Period(Observed/Estimated) 258.19 (Days Obs.) 257.41 (Days Est.)
Surface Gravity (G Earth) 4.8820
Star Radiation at Atmospheric Boundary: 3170.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 334.9 (K)
Blackbody T 0.3(K) 314.5 (K)
Blackbody T 0.7(K) 254.5 (K)
Tidally Locked Blackbody T 0.1(K) 398.3 (K)
Tidally Locked Blackbody T 0.3(K) 374.0 (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 : 23 Lib
Alternate Name : HD 134987
Star Distance(LY) : 72.4
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 9.7 (GY)
Temperature : 5740 (K)
Spectral type : G5 V
UV portion[%]: 7.7
Visible portion[%]: 44.6
IR portion[%]: 47.7
Metalicity : 0.2
Absolute Magnitude: 4.7
Apparent Magnitude: 6.5
Right Ascension(RA) 228.3667
Declination (DEC) -25.3092
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
23 Lib b
23 Lib b

  • 23 Lib b is an exoplanet orbiting the star 23 Lib, located about 72.4 light-years (22.2 pc) away from Solar System. Its discovery was publicly announced on 1999.
  • The host star 23 Lib has apparent magnitude of 6.5, with absolute magnitude of 4.7.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5740 with its spectral types of G5 V
  • In this planetary system, the extrasolar planet 23 Lib b orbits around the star 23 Lib every 258.2 days with its orbital distance of 0.81 AU ( 121174275.3 km)
  • (Projected orbit of 23 Lib b around its host star 23 Lib)


  • The Star 23 Lib 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.892 AU ( 133472535.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.233 AU ( 184493924.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.879 AU ( 281127912.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.765 AU ( 413692038.6 km)
  • Radiation at Planetary Boundary of 23 Lib b : 3170.31 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star 23 Lib)



  • Kopparapu Recent Venus for Star 23 Lib distance : 0.927 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star 23 Lib distance : 1.174 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star 23 Lib distance : 1.134 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star 23 Lib distance : 1.243 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star 23 Lib distance : 2.075 AU
  • Kopparapu Outer Boundary for Early Mars for Star 23 Lib distance : 2.188 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star 23 Lib)



  • Original Kopparapu Recent Venus for Star 23 Lib distance : 0.927 AU
  • Original Kopparapu Runaway Greenhouse for Star 23 Lib distance : 1.206 AU
  • Original Kopparapu Moist Greenhouse for Star 23 Lib distance : 1.227 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star 23 Lib distance : 2.111 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star 23 Lib distance : 2.195 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star 23 Lib)



    (Position in Stellar Map of star 23 Lib and its Exoplanet 23 Lib b)



    (Zoomed position in Stellar Map of star 23 Lib and its Exoplanet 23 Lib b (zoom level 3))

    (Synthetic Spectrum of star 23 Lib*)
    *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