Imaginary Picture of Proxima Centauri b

Display orbital revolution of Proxima Centauri b around the hoststar Proxima Centauri
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Exoplanet Name : Proxima Centauri b
Alternate Name : "alpha Cen C b, GL 551 C b, HIP 70890 b"
Radius (Rjup / Re): 0.0899 (Rjup) 1.0079 (Rearth)
Mass (Mjup / Me): 0.0037 (Mjup) 1.1735 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0490 (AU) 0.0490 (AU Est.)
Eccentricity : 0.1000
Orbital Period(Yrs) 0.0307
Orbital Period(Observed/Estimated) 11.22 (Days Obs.) 11.44 (Days Est.)
Surface Gravity (G Earth) 1.1553
Star Radiation at Atmospheric Boundary: 878.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 243.0 (K)
Blackbody T 0.3(K) 228.2 (K)
Blackbody T 0.7(K) 184.6 (K)
Tidally Locked Blackbody T 0.1(K) 289.0 (K)
Tidally Locked Blackbody T 0.3(K) 271.4 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Spectrum
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Habitable
Star Name : Proxima Centauri
Alternate Name : "alpha Cen C, GL 551, HIP 70890"
Star Distance(LY) : 4.2
Stellar Radius(Rsun) : 0.1 (Rsun Measured)
Stellar Mass(Msun) : 0.1 (Msun Measured) 0.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3050 (K)
Spectral type : M5.5V
UV portion[%]: 0.1
Visible portion[%]: 3.1
IR portion[%]: 96.8
Metalicity : 0.0
Absolute Magnitude: 15.6
Apparent Magnitude: 11.1
Right Ascension(RA) 217.4290
Declination (DEC) -63.1695
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Proxima+Cen+&submit=SIMBAD+search
Open Exoplanet Database Link
Proxima Centauri b
Proxima Centauri b

  • Proxima Centauri b is an exoplanet orbiting the star Proxima Centauri, located about 4.2 light-years ( 1.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Proxima Centauri has apparent magnitude of 11.1, with absolute magnitude of 15.6.
  • It is 0.1 times more massive and 0.1 times bigger compared with our Sun. The surface temperature is 3050 with its spectral types of M5.5V
  • In this planetary system, the extrasolar planet Proxima Centauri b orbits around the star Proxima Centauri every 11.2 days with its orbital distance of 0.05 AU ( 7330295.7 km)
  • (Projected orbit of Proxima Centauri b around its host star Proxima Centauri)


  • The Star Proxima Centauri 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.028 AU ( 4250861.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.039 AU ( 5875800.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.060 AU ( 8953420.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.088 AU ( 13175349.9 km)
  • Radiation at Planetary Boundary of Proxima Centauri b : 878.72 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Proxima Centauri)



  • Kopparapu Recent Venus for Star Proxima Centauri distance : 0.032 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Proxima Centauri distance : 0.041 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Proxima Centauri distance : 0.039 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Proxima Centauri distance : 0.043 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Proxima Centauri distance : 0.081 AU
  • Kopparapu Outer Boundary for Early Mars for Star Proxima Centauri distance : 0.086 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Proxima Centauri)



  • Original Kopparapu Recent Venus for Star Proxima Centauri distance : 0.032 AU
  • Original Kopparapu Runaway Greenhouse for Star Proxima Centauri distance : 0.042 AU
  • Original Kopparapu Moist Greenhouse for Star Proxima Centauri distance : 0.043 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Proxima Centauri distance : 0.082 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Proxima Centauri distance : 0.086 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Proxima Centauri)



    (Position in Stellar Map of star Proxima Centauri and its Exoplanet Proxima Centauri b)



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

    (Synthetic Spectrum of star Proxima Centauri*)
    *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