Imaginary Picture of GJ 687 b
/
Exoplanet Name : GJ 687 b
Alternate Name :
Radius (Rjup / Re): 0.2263 (Rjup) 2.5363 (Rearth)
Mass (Mjup / Me): 0.0580 (Mjup) 18.4404 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1635 (AU) 0.1635 (AU Est.)
Eccentricity : 0.0400
Orbital Period(Yrs) 0.1044
Orbital Period(Observed/Estimated) 38.14 (Days Obs.) 37.58 (Days Est.)
Star Radiation at Atmospheric Boundary: 1088.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 256.4 (K)
Blackbody T 0.3(K) 240.8 (K)
Blackbody T 0.7(K) 194.8 (K)
Tidally Locked Blackbody T 0.1(K) 304.9 (K)
Tidally Locked Blackbody T 0.3(K) 286.3 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : GJ 687
Alternate Name :
Star Distance(LY) : 14.8
Stellar Radius(Rsun) : 0.4 (Rsun Measured)
Stellar Mass(Msun) : 0.4 (Msun Measured) 0.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3413 (K)
Spectral type : M3.5V
Metalicity : 0.0
Absolute Magnitude: 10.9
Apparent Magnitude: 9.2
Right Ascension(RA) 264.1079
Declination (DEC) 68.3392
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title 0
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+687+&submit=SIMBAD+search
Open Exoplanet Database Link 0
GJ 687 b
GJ 687 b

  • GJ 687 b is an exoplanet orbiting the star GJ 687, located about 14.8 light-years ( 4.5 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star GJ 687 has apparent magnitude of 9.2, with absolute magnitude of 10.9.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3413 with its spectral types of M3.5V
  • In this planetary system, the extrasolar planet GJ 687 b orbits around the star GJ 687 every 38.1 days with its orbital distance of 0.16 AU ( 24463739.8 km)
  • (Projected orbit of GJ 687 b around its host star GJ 687)


  • The Star GJ 687 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.106 AU ( 15791324.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.146 AU ( 21827737.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.222 AU ( 33260640.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.327 AU ( 48944489.9 km)
  • Radiation at Planetary Boundary of GJ 687 b : 1088.76 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 687)



  • Kopparapu Recent Venus for Star GJ 687 distance : 0.119 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 687 distance : 0.151 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 687 distance : 0.146 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 687 distance : 0.161 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 687 distance : 0.295 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 687 distance : 0.311 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 687)



  • Original Kopparapu Recent Venus for Star GJ 687 distance : 0.118 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 687 distance : 0.156 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 687 distance : 0.157 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 687 distance : 0.300 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 687 distance : 0.312 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 687)



    (Position in Stellar Map of star GJ 687 and its Exoplanet GJ 687 b)



    (Zoomed position in Stellar Map of star GJ 687 and its Exoplanet GJ 687 b (zoom level 3))