Imaginary Picture of GJ 685 b

Display orbital revolution of GJ 685 b around the hoststar GJ 685
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Exoplanet Name : GJ 685 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1582 (Rjup) 1.7732 (Rearth)
Mass (Mjup / Me): 0.0283 (Mjup) 8.9976 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1344 (AU) 0.1344 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0661
Orbital Period(Observed/Estimated) 24.16 (Days Obs.) 24.27 (Days Est.)
Surface Gravity (G Earth) 2.8617
Star Radiation at Atmospheric Boundary: 4197.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 359.3 (K)
Blackbody T 0.3(K) 337.4 (K)
Blackbody T 0.7(K) 273.0 (K)
Tidally Locked Blackbody T 0.1(K) 427.2 (K)
Tidally Locked Blackbody T 0.3(K) 401.2 (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 685
Alternate Name :
Star Distance(LY) : 46.7
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3816 (K)
Spectral type : M0.5
UV portion[%]: 0.4
Visible portion[%]: 19.7
IR portion[%]: 79.9
Metalicity : -0.1
Absolute Magnitude: 9.2
Apparent Magnitude: 10.0
Right Ascension(RA) 263.8937
Declination (DEC) 61.6794
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+685+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 685 b
GJ 685 b

  • GJ 685 b is an exoplanet orbiting the star GJ 685, located about 46.7 light-years (14.3 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star GJ 685 has apparent magnitude of 10.0, with absolute magnitude of 9.2.
  • It is 0.6 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3816 with its spectral types of M0.5
  • In this planetary system, the extrasolar planet GJ 685 b orbits around the star GJ 685 every 24.2 days with its orbital distance of 0.13 AU ( 20105953.8 km)
  • (Projected orbit of GJ 685 b around its host star GJ 685)


  • The Star GJ 685 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.170 AU ( 25484059.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.235 AU ( 35225629.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.359 AU ( 53676064.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.528 AU ( 78986679.5 km)
  • Radiation at Planetary Boundary of GJ 685 b : 4197.85 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 685)



  • Kopparapu Recent Venus for Star GJ 685 distance : 0.192 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 685 distance : 0.242 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 685 distance : 0.234 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 685 distance : 0.257 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 685 distance : 0.464 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 685 distance : 0.490 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 685)



  • Original Kopparapu Recent Venus for Star GJ 685 distance : 0.189 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 685 distance : 0.251 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 685 distance : 0.251 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 685 distance : 0.472 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 685 distance : 0.491 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 685)



    (Position in Stellar Map of star GJ 685 and its Exoplanet GJ 685 b)



    (Zoomed position in Stellar Map of star GJ 685 and its Exoplanet GJ 685 b (zoom level 3))

    (Synthetic Spectrum of star GJ 685*)
    *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