Imaginary Picture of Ross 128 b
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Exoplanet Name : Ross 128 b
Alternate Name :
Radius (Rjup / Re): 0.0979 (Rjup) 1.0972 (Rearth)
Mass (Mjup / Me): 0.0044 (Mjup) 1.3989 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0496 (AU) 0.0496 (AU Est.)
Eccentricity : 0.1160
Orbital Period(Yrs) 0.0270
Orbital Period(Observed/Estimated) 9.87 (Days Obs.) 9.84 (Days Est.)
Star Radiation at Atmospheric Boundary: 2002.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 298.6 (K)
Blackbody T 0.3(K) 280.4 (K)
Blackbody T 0.7(K) 226.8 (K)
Tidally Locked Blackbody T 0.1(K) 355.0 (K)
Tidally Locked Blackbody T 0.3(K) 333.4 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Habitable
Star Name : Ross 128
Alternate Name : "Proxima Virginis, GJ447, HIP 57548"
Star Distance(LY) : 11.0
Stellar Radius(Rsun) : 0.2 (Rsun Measured)
Stellar Mass(Msun) : 0.2 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 5.0 (GY)
Temperature : 3192 (K)
Spectral type : M4
Metalicity : -0.0
Absolute Magnitude: 13.5
Apparent Magnitude: 11.2
Right Ascension(RA) 176.9350
Declination (DEC) 0.8044
Hubble Space Telescope Guide Star Catalog (GSC) ID 00272-01051
Discovered by X. Bonfils et al.
Discovery Paper - Authors X. Bonfils et al.
Discovery Paper - Title A temperate exo-Earth around a quiet M dwarf at 3.4 parsecs
Discovery Paper - Journal Astronomy & Astrophysics manuscript
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Ross+128+&submit=SIMBAD+search
Open Exoplanet Database Link
Ross 128 b
Ross 128 b

  • Ross 128 b is an exoplanet orbiting the star Ross 128, located about 11.0 light-years ( 3.4 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Ross 128 has apparent magnitude of 11.2, with absolute magnitude of 13.5.
  • It is 0.2 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3192 with its spectral types of M4
  • In this planetary system, the extrasolar planet Ross 128 b orbits around the star Ross 128 every 9.9 days with its orbital distance of 0.05 AU ( 7420054.4 km)
  • (Projected orbit of Ross 128 b around its host star Ross 128)


  • The Star Ross 128 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.043 AU ( 6495135.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.060 AU ( 8977975.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.091 AU ( 13680447.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.135 AU ( 20131377.4 km)
  • Radiation at Planetary Boundary of Ross 128 b : 2002.17 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Ross 128)



  • Kopparapu Recent Venus for Star Ross 128 distance : 0.049 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Ross 128 distance : 0.062 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Ross 128 distance : 0.060 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Ross 128 distance : 0.066 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Ross 128 distance : 0.123 AU
  • Kopparapu Outer Boundary for Early Mars for Star Ross 128 distance : 0.130 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Ross 128)



  • Original Kopparapu Recent Venus for Star Ross 128 distance : 0.049 AU
  • Original Kopparapu Runaway Greenhouse for Star Ross 128 distance : 0.065 AU
  • Original Kopparapu Moist Greenhouse for Star Ross 128 distance : 0.065 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Ross 128 distance : 0.125 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Ross 128 distance : 0.130 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Ross 128)



    (Position in Stellar Map of star Ross 128 and its Exoplanet Ross 128 b)



    (Zoomed position in Stellar Map of star Ross 128 and its Exoplanet Ross 128 b (zoom level 3))