Imaginary Picture of GJ 229 b

Display orbital revolution of GJ 229 b around the hoststar GJ 229
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Exoplanet Name : GJ 229 b
Alternate Name :
Radius (Rjup / Re): 0.2569 (Rjup) 2.8793 (Rearth)
Mass (Mjup / Me): 0.1007 (Mjup) 32.0109 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.9700 (AU) 0.9700 (AU Est.)
Eccentricity : 0.1000
Orbital Period(Yrs) 1.2895
Orbital Period(Observed/Estimated) 471.00 (Days Obs.) 458.18 (Days Est.)
Surface Gravity (G Earth) 3.8611
Star Radiation at Atmospheric Boundary: 58.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 123.2 (K)
Blackbody T 0.3(K) 115.7 (K)
Blackbody T 0.7(K) 93.6 (K)
Tidally Locked Blackbody T 0.1(K) 146.5 (K)
Tidally Locked Blackbody T 0.3(K) 137.6 (K)
Size Class: sub-Neptune-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 : GJ 229
Alternate Name :
Star Distance(LY) : 18.9
Stellar Radius(Rsun) : 0.5 (Rsun Estimated)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3564 (K)
Spectral type : M1/M2V
UV portion[%]: 0.3
Visible portion[%]: 15.9
IR portion[%]: 83.7
Metalicity : 0.0
Absolute Magnitude: 9.3
Apparent Magnitude: 8.1
Right Ascension(RA) 92.6442
Declination (DEC) -20.1354
Hubble Space Telescope Guide Star Catalog (GSC) ID 05945-00765
Discovered by
Discovery Paper - Authors "Allard,rance; Hauschildt,eter.; Baraffe,sabelle; Chabrier,illes"
Discovery Paper - Title Synthetic Spectra and Mass Determination of the Brown Dwarf GI 229B
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+229+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/GJ%20229%20b/
GJ 229 b
GJ 229 b

  • GJ 229 b is an exoplanet orbiting the star GJ 229, located about 18.9 light-years ( 5.8 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star GJ 229 has apparent magnitude of 8.1, with absolute magnitude of 9.3.
  • It is 0.6 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3564 with its spectral types of M1/M2V
  • In this planetary system, the extrasolar planet GJ 229 b orbits around the star GJ 229 every 471.0 days with its orbital distance of 0.97 AU ( 145109934.6 km)
  • (Projected orbit of GJ 229 b around its host star GJ 229)


  • The Star GJ 229 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.145 AU ( 21619794.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.200 AU ( 29884205.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.304 AU ( 45536915.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.448 AU ( 67009566.4 km)
  • Radiation at Planetary Boundary of GJ 229 b : 58.00 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 229)



  • Kopparapu Recent Venus for Star GJ 229 distance : 0.163 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 229 distance : 0.206 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 229 distance : 0.199 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 229 distance : 0.219 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 229 distance : 0.400 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 229 distance : 0.423 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 229)



  • Original Kopparapu Recent Venus for Star GJ 229 distance : 0.162 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 229 distance : 0.214 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 229 distance : 0.214 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 229 distance : 0.407 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 229 distance : 0.423 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 229)



    (Position in Stellar Map of star GJ 229 and its Exoplanet GJ 229 b)



    (Zoomed position in Stellar Map of star GJ 229 and its Exoplanet GJ 229 b (zoom level 3))

    (Synthetic Spectrum of star GJ 229*)
    *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