Imaginary Picture of CP Eri b

Display orbital revolution of CP Eri b around the hoststar CP Eri
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Exoplanet Name : CP Eri b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 35.0000 (Mjup) 11127.8300 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0012 (AU) 0.0012 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0001
Orbital Period(Observed/Estimated) 0.02 (Days Obs.) 0.02 (Days Est.)
Surface Gravity (G Earth) 107.4652
Star Radiation at Atmospheric Boundary: 300909792.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 5878.3 (K)
Blackbody T 0.3(K) 5520.3 (K)
Blackbody T 0.7(K) 4466.5 (K)
Tidally Locked Blackbody T 0.1(K) 6990.5 (K)
Tidally Locked Blackbody T 0.3(K) 6564.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : "Timing, Other"
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : CP Eri
Alternate Name : PHL 1457
Star Distance(LY) : 3261.6
Stellar Radius(Rsun) : 0.6 (Rsun Estimated)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5500 (K)
Spectral type : DB
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : 0.0
Absolute Magnitude: 7.8
Apparent Magnitude: 17.8
Right Ascension(RA) 47.6365
Declination (DEC) -9.7517
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
CP Eri b
CP Eri b

  • CP Eri b is an exoplanet orbiting the star CP Eri, located about 3261.6 light-years (1000.0 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star CP Eri has apparent magnitude of 17.8, with absolute magnitude of 7.8.
  • It is 0.8 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 5500 with its spectral types of DB
  • In this planetary system, the extrasolar planet CP Eri b orbits around the star CP Eri every 0.0 days with its orbital distance of 0.00 AU ( 186398.9 km)
  • (Projected orbit of CP Eri b around its host star CP Eri)


  • The Star CP Eri 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.423 AU ( 63254570.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.584 AU ( 87434346.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.891 AU ( 133230595.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.311 AU ( 196054657.1 km)
  • Radiation at Planetary Boundary of CP Eri b : 300909792.69 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star CP Eri)



  • Kopparapu Recent Venus for Star CP Eri distance : 0.445 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star CP Eri distance : 0.564 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star CP Eri distance : 0.545 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star CP Eri distance : 0.598 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star CP Eri distance : 1.004 AU
  • Kopparapu Outer Boundary for Early Mars for Star CP Eri distance : 1.059 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star CP Eri)



  • Original Kopparapu Recent Venus for Star CP Eri distance : 0.444 AU
  • Original Kopparapu Runaway Greenhouse for Star CP Eri distance : 0.580 AU
  • Original Kopparapu Moist Greenhouse for Star CP Eri distance : 0.587 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star CP Eri distance : 1.022 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star CP Eri distance : 1.062 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star CP Eri)



    (Position in Stellar Map of star CP Eri and its Exoplanet CP Eri b)



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

    (Synthetic Spectrum of star CP Eri*)
    *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