Imaginary Picture of GJ 3998 b
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Exoplanet Name : GJ 3998 b
Alternate Name :
Radius (Rjup / Re): 0.1137 (Rjup) 1.2743 (Rearth)
Mass (Mjup / Me): 0.0078 (Mjup) 2.4704 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0290 (AU) 0.0290 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0073
Orbital Period(Observed/Estimated) 2.65 (Days Obs.) 2.55 (Days Est.)
Star Radiation at Atmospheric Boundary: 67190.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 718.6 (K)
Blackbody T 0.3(K) 674.8 (K)
Blackbody T 0.7(K) 546.0 (K)
Tidally Locked Blackbody T 0.1(K) 854.5 (K)
Tidally Locked Blackbody T 0.3(K) 802.5 (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 3998
Alternate Name :
Star Distance(LY) : 58.1
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3722 (K)
Spectral type : M1
Metalicity : -0.2
Absolute Magnitude: 9.5
Apparent Magnitude: 10.8
Right Ascension(RA) 259.0027
Declination (DEC) 11.0583
Hubble Space Telescope Guide Star Catalog (GSC) ID 00982-00121
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+3998+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 3998 b
GJ 3998 b

  • GJ 3998 b is an exoplanet orbiting the star GJ 3998, located about 58.1 light-years (17.8 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star GJ 3998 has apparent magnitude of 10.8, with absolute magnitude of 9.5.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3722 with its spectral types of M1
  • In this planetary system, the extrasolar planet GJ 3998 b orbits around the star GJ 3998 every 2.6 days with its orbital distance of 0.03 AU ( 4338338.3 km)
  • (Projected orbit of GJ 3998 b around its host star GJ 3998)


  • The Star GJ 3998 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.147 AU ( 21999202.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.203 AU ( 30408646.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.310 AU ( 46336047.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.456 AU ( 68185524.1 km)
  • Radiation at Planetary Boundary of GJ 3998 b : 67190.28 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 3998)



  • Kopparapu Recent Venus for Star GJ 3998 distance : 0.166 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 3998 distance : 0.210 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 3998 distance : 0.202 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 3998 distance : 0.223 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 3998 distance : 0.403 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 3998 distance : 0.426 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 3998)



  • Original Kopparapu Recent Venus for Star GJ 3998 distance : 0.164 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 3998 distance : 0.217 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 3998 distance : 0.217 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 3998 distance : 0.410 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 3998 distance : 0.426 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 3998)



    (Position in Stellar Map of star GJ 3998 and its Exoplanet GJ 3998 b)



    (Zoomed position in Stellar Map of star GJ 3998 and its Exoplanet GJ 3998 b (zoom level 3))