Imaginary Picture of GJ 1214 b
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Exoplanet Name : GJ 1214 b
Alternate Name :
Radius (Rjup / Re): 0.2382 (Rjup) 2.6700 (Rearth)
Mass (Mjup / Me): 0.0203 (Mjup) 6.4622 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0141 (AU) 0.0141 (AU Est.)
Eccentricity : 0.2700
Orbital Period(Yrs) 0.0043
Orbital Period(Observed/Estimated) 1.58 (Days Obs.) 1.58 (Days Est.)
Star Radiation at Atmospheric Boundary: 24095.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 556.1 (K)
Blackbody T 0.3(K) 522.2 (K)
Blackbody T 0.7(K) 422.5 (K)
Tidally Locked Blackbody T 0.1(K) 661.3 (K)
Tidally Locked Blackbody T 0.3(K) 621.0 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : GJ 1214
Alternate Name :
Star Distance(LY) : 47.8
Stellar Radius(Rsun) : 0.2 (Rsun Measured)
Stellar Mass(Msun) : 0.1 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 6.0 (GY)
Temperature : 3026 (K)
Spectral type : M
Metalicity : 0.4
Absolute Magnitude: 13.9
Apparent Magnitude: 14.7
Right Ascension(RA) 258.8289
Declination (DEC) 4.9639
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+1214+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 1214 b
GJ 1214 b

  • GJ 1214 b is an exoplanet orbiting the star GJ 1214, located about 47.8 light-years (14.6 pc) away from Solar System. Its discovery was publicly announced on 2009.
  • The host star GJ 1214 has apparent magnitude of 14.7, with absolute magnitude of 13.9.
  • It is 0.1 times more massive and 0.2 times bigger compared with our Sun. The surface temperature is 3026 with its spectral types of M
  • In this planetary system, the extrasolar planet GJ 1214 b orbits around the star GJ 1214 every 1.6 days with its orbital distance of 0.01 AU ( 2110826.0 km)
  • (Projected orbit of GJ 1214 b around its host star GJ 1214)


  • The Star GJ 1214 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.043 AU ( 6409877.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.059 AU ( 8860125.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.090 AU ( 13500870.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.133 AU ( 19867122.2 km)
  • Radiation at Planetary Boundary of GJ 1214 b : 24095.39 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 1214)



  • Kopparapu Recent Venus for Star GJ 1214 distance : 0.049 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 1214 distance : 0.062 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 1214 distance : 0.059 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 1214 distance : 0.065 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 1214 distance : 0.123 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 1214 distance : 0.129 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 1214)



  • Original Kopparapu Recent Venus for Star GJ 1214 distance : 0.048 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 1214 distance : 0.064 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 1214 distance : 0.064 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 1214 distance : 0.125 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 1214 distance : 0.130 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 1214)



    (Position in Stellar Map of star GJ 1214 and its Exoplanet GJ 1214 b)



    (Zoomed position in Stellar Map of star GJ 1214 and its Exoplanet GJ 1214 b (zoom level 3))