Imaginary Picture of GJ 229 A c

Display orbital revolution of GJ 229 A c around the hoststar GJ 229
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Exoplanet Name : GJ 229 A c
Alternate Name :
Radius (Rjup / Re): 0.1533 (Rjup) 1.7179 (Rearth)
Mass (Mjup / Me): 0.0249 (Mjup) 7.9326 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.3390 (AU) 0.3390 (AU Est.)
Eccentricity : 0.2900
Orbital Period(Yrs) 0.3340
Orbital Period(Observed/Estimated) 122.00 (Days Obs.) 94.66 (Days Est.)
Surface Gravity (G Earth) 2.6878
Star Radiation at Atmospheric Boundary: 474.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 208.3 (K)
Blackbody T 0.3(K) 195.7 (K)
Blackbody T 0.7(K) 158.3 (K)
Tidally Locked Blackbody T 0.1(K) 247.8 (K)
Tidally Locked Blackbody T 0.3(K) 232.7 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Spectrum
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Habitable
Star Name : GJ 229
Alternate Name :
Star Distance(LY) : 18.8
Stellar Radius(Rsun) : 0.5 (Rsun Estimated)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3564 (K)
Spectral type : M1 V
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) -21.8646
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
GJ 229 A c
GJ 229 A c

  • GJ 229 A c is an exoplanet orbiting the star GJ 229, located about 18.8 light-years ( 5.8 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • 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 V
  • In this planetary system, the extrasolar planet GJ 229 A c orbits around the star GJ 229 every 122.0 days with its orbital distance of 0.34 AU ( 50713678.2 km)
  • (Projected orbit of GJ 229 A c 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 A c : 474.89 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 A c)



    (Zoomed position in Stellar Map of star GJ 229 and its Exoplanet GJ 229 A c (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