Imaginary Picture of GJ 887 c
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Exoplanet Name : GJ 887 c
Alternate Name :
Radius (Rjup / Re): 0.1516 (Rjup) 1.6995 (Rearth)
Mass (Mjup / Me): 0.0239 (Mjup) 7.5987 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1200 (AU) 0.1200 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0597
Orbital Period(Observed/Estimated) 21.79 (Days Obs.) 21.71 (Days Est.)
Star Radiation at Atmospheric Boundary: 3498.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 343.2 (K)
Blackbody T 0.3(K) 322.3 (K)
Blackbody T 0.7(K) 260.8 (K)
Tidally Locked Blackbody T 0.1(K) 408.2 (K)
Tidally Locked Blackbody T 0.3(K) 383.3 (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 : GJ 887
Alternate Name : HD 217987
Star Distance(LY) : 10.7
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3688 (K)
Spectral type : M1V
Metalicity : -0.1
Absolute Magnitude: 9.8
Apparent Magnitude: 7.3
Right Ascension(RA) 346.4668
Declination (DEC) -35.8531
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+887+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 887 c
GJ 887 c

  • GJ 887 c is an exoplanet orbiting the star GJ 887, located about 10.7 light-years ( 3.3 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star GJ 887 has apparent magnitude of 7.3, with absolute magnitude of 9.8.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3688 with its spectral types of M1V
  • In this planetary system, the extrasolar planet GJ 887 c orbits around the star GJ 887 every 21.8 days with its orbital distance of 0.12 AU ( 17951744.5 km)
  • (Projected orbit of GJ 887 c around its host star GJ 887)


  • The Star GJ 887 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.139 AU ( 20770417.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.192 AU ( 28710144.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.292 AU ( 43747906.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.430 AU ( 64376961.1 km)
  • Radiation at Planetary Boundary of GJ 887 c : 3497.97 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 887)



  • Kopparapu Recent Venus for Star GJ 887 distance : 0.156 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 887 distance : 0.198 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 887 distance : 0.191 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 887 distance : 0.210 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 887 distance : 0.382 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 887 distance : 0.403 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 887)



  • Original Kopparapu Recent Venus for Star GJ 887 distance : 0.155 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 887 distance : 0.205 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 887 distance : 0.205 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 887 distance : 0.388 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 887 distance : 0.403 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 887)



    (Position in Stellar Map of star GJ 887 and its Exoplanet GJ 887 c)



    (Zoomed position in Stellar Map of star GJ 887 and its Exoplanet GJ 887 c (zoom level 3))