Imaginary Picture of GJ 176 c

Display orbital revolution of GJ 176 c around the hoststar GJ 176
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Exoplanet Name : GJ 176 c
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1506 (Rjup) 1.6886 (Rearth)
Mass (Mjup / Me): 0.0233 (Mjup) 7.4080 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1460 (AU) 0.1460 (AU Est.)
Eccentricity : 0.0200
Orbital Period(Yrs) 0.0783
Orbital Period(Observed/Estimated) 28.59 (Days Obs.) 29.11 (Days Est.)
Surface Gravity (G Earth) 2.5980
Star Radiation at Atmospheric Boundary: 2714.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 322.1 (K)
Blackbody T 0.3(K) 302.5 (K)
Blackbody T 0.7(K) 244.8 (K)
Tidally Locked Blackbody T 0.1(K) 383.1 (K)
Tidally Locked Blackbody T 0.3(K) 359.8 (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 176
Alternate Name :
Star Distance(LY) : 30.9
Stellar Radius(Rsun) : 0.5 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3600 (K)
Spectral type : M2.5V
UV portion[%]: 0.3
Visible portion[%]: 12.1
IR portion[%]: 87.6
Metalicity : -0.1
Absolute Magnitude: 10.1
Apparent Magnitude: 10.0
Right Ascension(RA) 70.7324
Declination (DEC) 18.9581
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+176+&submit=SIMBAD+search
Open Exoplanet Database Link
GJ 176 c
GJ 176 c

  • GJ 176 c is an exoplanet orbiting the star GJ 176, located about 30.9 light-years ( 9.5 pc) away from Solar System. Its discovery was publicly announced on 2009.
  • The host star GJ 176 has apparent magnitude of 10.0, with absolute magnitude of 10.1.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3600 with its spectral types of M2.5V
  • In this planetary system, the extrasolar planet GJ 176 c orbits around the star GJ 176 every 28.6 days with its orbital distance of 0.15 AU ( 21841289.1 km)
  • (Projected orbit of GJ 176 c around its host star GJ 176)


  • The Star GJ 176 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.149 AU ( 22260708.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.206 AU ( 30770116.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.313 AU ( 46886848.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.461 AU ( 68996051.3 km)
  • Radiation at Planetary Boundary of GJ 176 c : 2714.32 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star GJ 176)



  • Kopparapu Recent Venus for Star GJ 176 distance : 0.168 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star GJ 176 distance : 0.212 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star GJ 176 distance : 0.205 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star GJ 176 distance : 0.226 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 176 distance : 0.411 AU
  • Kopparapu Outer Boundary for Early Mars for Star GJ 176 distance : 0.434 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star GJ 176)



  • Original Kopparapu Recent Venus for Star GJ 176 distance : 0.166 AU
  • Original Kopparapu Runaway Greenhouse for Star GJ 176 distance : 0.220 AU
  • Original Kopparapu Moist Greenhouse for Star GJ 176 distance : 0.220 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star GJ 176 distance : 0.418 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star GJ 176 distance : 0.435 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star GJ 176)



    (Position in Stellar Map of star GJ 176 and its Exoplanet GJ 176 c)



    (Zoomed position in Stellar Map of star GJ 176 and its Exoplanet GJ 176 c (zoom level 3))

    (Synthetic Spectrum of star GJ 176*)
    *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