Imaginary Picture of Gl 686 b
/
Exoplanet Name : Gl 686 b
Alternate Name : "BD+18 3421 b, GJ 686 b"
Radius (Rjup / Re): 0.1455 (Rjup) 1.6306 (Rearth)
Mass (Mjup / Me): 0.0203 (Mjup) 6.4510 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0912 (AU) 0.0912 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0425
Orbital Period(Observed/Estimated) 15.53 (Days Obs.) 15.52 (Days Est.)
Star Radiation at Atmospheric Boundary: 4682.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 369.2 (K)
Blackbody T 0.3(K) 346.7 (K)
Blackbody T 0.7(K) 280.5 (K)
Tidally Locked Blackbody T 0.1(K) 439.1 (K)
Tidally Locked Blackbody T 0.3(K) 412.3 (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 : Gl 686
Alternate Name :
Star Distance(LY) : 26.6
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3663 (K)
Spectral type : M1
Metalicity : -0.3
Absolute Magnitude: 10.0
Apparent Magnitude: 9.6
Right Ascension(RA) 264.4723
Declination (DEC) 18.5892
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=Gl+686+&submit=SIMBAD+search
Open Exoplanet Database Link
Gl 686 b
Gl 686 b

  • Gl 686 b is an exoplanet orbiting the star Gl 686, located about 26.6 light-years ( 8.2 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star Gl 686 has apparent magnitude of 9.6, with absolute magnitude of 10.0.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3663 with its spectral types of M1
  • In this planetary system, the extrasolar planet Gl 686 b orbits around the star Gl 686 every 15.5 days with its orbital distance of 0.09 AU ( 13643325.8 km)
  • (Projected orbit of Gl 686 b around its host star Gl 686)


  • The Star Gl 686 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.122 AU ( 18263383.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.169 AU ( 25244768.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.257 AU ( 38467441.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.378 AU ( 56606524.8 km)
  • Radiation at Planetary Boundary of Gl 686 b : 4682.32 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Gl 686)



  • Kopparapu Recent Venus for Star Gl 686 distance : 0.138 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Gl 686 distance : 0.174 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Gl 686 distance : 0.168 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Gl 686 distance : 0.185 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Gl 686 distance : 0.336 AU
  • Kopparapu Outer Boundary for Early Mars for Star Gl 686 distance : 0.355 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Gl 686)



  • Original Kopparapu Recent Venus for Star Gl 686 distance : 0.136 AU
  • Original Kopparapu Runaway Greenhouse for Star Gl 686 distance : 0.180 AU
  • Original Kopparapu Moist Greenhouse for Star Gl 686 distance : 0.180 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Gl 686 distance : 0.342 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Gl 686 distance : 0.355 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Gl 686)



    (Position in Stellar Map of star Gl 686 and its Exoplanet Gl 686 b)



    (Zoomed position in Stellar Map of star Gl 686 and its Exoplanet Gl 686 b (zoom level 3))