Imaginary Picture of GJ 9827 c
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Exoplanet Name : GJ 9827 c
Alternate Name :
Radius (Rjup / Re): 0.1150 (Rjup) 1.2890 (Rearth)
Mass (Mjup / Me): 0.0079 (Mjup) 2.5117 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0440 (AU) 0.0440 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0100
Orbital Period(Observed/Estimated) 3.65 (Days Obs.) 4.15 (Days Est.)
Star Radiation at Atmospheric Boundary: 87995.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 768.7 (K)
Blackbody T 0.3(K) 721.9 (K)
Blackbody T 0.7(K) 584.1 (K)
Tidally Locked Blackbody T 0.1(K) 914.1 (K)
Tidally Locked Blackbody T 0.3(K) 858.5 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : GJ 9827
Alternate Name :
Star Distance(LY) : 98.8
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4255 (K)
Spectral type : K6V
Metalicity : -0.3
Absolute Magnitude: 8.0
Apparent Magnitude: 10.4
Right Ascension(RA) 352.1042
Declination (DEC) -1.2864
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
GJ 9827 c
GJ 9827 c

  • GJ 9827 c is an exoplanet orbiting the star GJ 9827, located about 98.8 light-years (30.3 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star GJ 9827 has apparent magnitude of 10.4, with absolute magnitude of 8.0.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4255 with its spectral types of K6V
  • In this planetary system, the extrasolar planet GJ 9827 c orbits around the star GJ 9827 every 3.6 days with its orbital distance of 0.04 AU ( 6582306.3 km)
  • (Projected orbit of GJ 9827 c around its host star GJ 9827)


  • The Star GJ 9827 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.255 AU ( 38197789.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.353 AU ( 52799327.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.538 AU ( 80454490.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.791 AU ( 118392306.8 km)
  • Radiation at Planetary Boundary of GJ 9827 c : 87995.34 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 9827)



  • Kopparapu Recent Venus for Star GJ 9827 distance : 0.284 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 9827 distance : 0.360 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 9827 distance : 0.347 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 9827 distance : 0.382 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 9827 distance : 0.674 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 9827 distance : 0.711 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 9827)



  • Original Kopparapu Recent Venus for Star GJ 9827 distance : 0.280 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 9827 distance : 0.372 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 9827 distance : 0.371 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 9827 distance : 0.685 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 9827 distance : 0.712 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 9827)



    (Position in Stellar Map of star GJ 9827 and its Exoplanet GJ 9827 c)



    (Zoomed position in Stellar Map of star GJ 9827 and its Exoplanet GJ 9827 c (zoom level 3))