Imaginary Picture of GJ 3942 b
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Exoplanet Name : GJ 3942 b
Alternate Name :
Radius (Rjup / Re): 0.1493 (Rjup) 1.6738 (Rearth)
Mass (Mjup / Me): 0.0225 (Mjup) 7.1536 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0608 (AU) 0.0608 (AU Est.)
Eccentricity : 0.1210
Orbital Period(Yrs) 0.0189
Orbital Period(Observed/Estimated) 6.91 (Days Obs.) 6.90 (Days Est.)
Star Radiation at Atmospheric Boundary: 27602.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 575.3 (K)
Blackbody T 0.3(K) 540.3 (K)
Blackbody T 0.7(K) 437.1 (K)
Tidally Locked Blackbody T 0.1(K) 684.1 (K)
Tidally Locked Blackbody T 0.3(K) 642.5 (K)
Size Class: super-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 3942
Alternate Name :
Star Distance(LY) : 55.2
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3867 (K)
Spectral type : M0
Metalicity : -0.0
Absolute Magnitude: 8.9
Apparent Magnitude: 10.0
Right Ascension(RA) 242.2631
Declination (DEC) 52.9439
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+3942+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 3942 b
GJ 3942 b

  • GJ 3942 b is an exoplanet orbiting the star GJ 3942, located about 55.2 light-years (16.9 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star GJ 3942 has apparent magnitude of 10.0, with absolute magnitude of 8.9.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3867 with its spectral types of M0
  • In this planetary system, the extrasolar planet GJ 3942 b orbits around the star GJ 3942 every 6.9 days with its orbital distance of 0.06 AU ( 9095550.5 km)
  • (Projected orbit of GJ 3942 b around its host star GJ 3942)


  • The Star GJ 3942 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.198 AU ( 29562168.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.273 AU ( 40862642.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.416 AU ( 62265624.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.612 AU ( 91626594.3 km)
  • Radiation at Planetary Boundary of GJ 3942 b : 27602.86 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 3942)



  • Kopparapu Recent Venus for Star GJ 3942 distance : 0.222 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 3942 distance : 0.281 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 3942 distance : 0.271 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 3942 distance : 0.298 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 3942 distance : 0.537 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 3942 distance : 0.566 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 3942)



  • Original Kopparapu Recent Venus for Star GJ 3942 distance : 0.219 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 3942 distance : 0.291 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 3942 distance : 0.290 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 3942 distance : 0.545 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 3942 distance : 0.567 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 3942)



    (Position in Stellar Map of star GJ 3942 and its Exoplanet GJ 3942 b)



    (Zoomed position in Stellar Map of star GJ 3942 and its Exoplanet GJ 3942 b (zoom level 3))