Imaginary Picture of GJ 393 b

Display orbital revolution of GJ 393 b around the hoststar GJ 393
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Exoplanet Name : GJ 393 b
Alternate Name : Gl 393 b
Status : Confirmed
Radius (Rjup / Re): 0.1032 (Rjup) 1.1572 (Rearth)
Mass (Mjup / Me): 0.0054 (Mjup) 1.7105 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0540 (AU) 0.0540 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0192
Orbital Period(Observed/Estimated) 7.03 (Days Obs.) 7.03 (Days Est.)
Surface Gravity (G Earth) 1.2773
Star Radiation at Atmospheric Boundary: 12513.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 472.0 (K)
Blackbody T 0.3(K) 443.3 (K)
Blackbody T 0.7(K) 358.7 (K)
Tidally Locked Blackbody T 0.1(K) 561.4 (K)
Tidally Locked Blackbody T 0.3(K) 527.2 (K)
Size Class: Earth-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : GJ 393
Alternate Name : Gl 393
Star Distance(LY) : 23.0
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3579 (K)
Spectral type : M2.0V
UV portion[%]: 0.4
Visible portion[%]: 16.2
IR portion[%]: 83.4
Metalicity : -0.1
Absolute Magnitude: 9.8
Apparent Magnitude: 9.0
Right Ascension(RA) 157.2292
Declination (DEC) 0.8378
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 393 b
GJ 393 b

  • GJ 393 b is an exoplanet orbiting the star GJ 393, located about 23.0 light-years ( 7.0 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star GJ 393 has apparent magnitude of 9.0, with absolute magnitude of 9.8.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3579 with its spectral types of M2.0V
  • In this planetary system, the extrasolar planet GJ 393 b orbits around the star GJ 393 every 7.0 days with its orbital distance of 0.05 AU ( 8081277.0 km)
  • (Projected orbit of GJ 393 b around its host star GJ 393)


  • The Star GJ 393 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.118 AU ( 17684431.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.163 AU ( 24444506.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.249 AU ( 37248017.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.366 AU ( 54812089.9 km)
  • Radiation at Planetary Boundary of GJ 393 b : 12513.01 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 393)



  • Kopparapu Recent Venus for Star GJ 393 distance : 0.133 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 393 distance : 0.169 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 393 distance : 0.163 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 393 distance : 0.179 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 393 distance : 0.327 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 393 distance : 0.345 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 393)



  • Original Kopparapu Recent Venus for Star GJ 393 distance : 0.132 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 393 distance : 0.175 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 393 distance : 0.175 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 393 distance : 0.332 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 393 distance : 0.346 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 393)



    (Position in Stellar Map of star GJ 393 and its Exoplanet GJ 393 b)



    (Zoomed position in Stellar Map of star GJ 393 and its Exoplanet GJ 393 b (zoom level 3))

    (Synthetic Spectrum of star GJ 393*)
    *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