Imaginary Picture of HD 2685 b
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Exoplanet Name : HD 2685 b
Alternate Name :
Radius (Rjup / Re): 1.4400 (Rjup) 16.1410 (Rearth)
Mass (Mjup / Me): 1.1800 (Mjup) 375.1668 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0568 (AU) 0.0568 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0113
Orbital Period(Observed/Estimated) 4.13 (Days Obs.) 4.12 (Days Est.)
Star Radiation at Atmospheric Boundary: 2004465.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1679.4 (K)
Blackbody T 0.3(K) 1577.1 (K)
Blackbody T 0.7(K) 1276.0 (K)
Tidally Locked Blackbody T 0.1(K) 1997.1 (K)
Tidally Locked Blackbody T 0.3(K) 1875.5 (K)
Size Class: Super-Jupiter-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 : HD 2685
Alternate Name :
Star Distance(LY) : 645.7
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.4 (Msun Measured) 1.4 (Msun Estimated)
Star Age : 1.3 (GY)
Temperature : 6801 (K)
Spectral type : F4
Metalicity : 0.0
Absolute Magnitude: 3.1
Apparent Magnitude: 9.6
Right Ascension(RA) 7.3290
Declination (DEC) -76.3042
Hubble Space Telescope Guide Star Catalog (GSC) ID 09346-00239
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=HD+2685+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 2685 b
HD 2685 b

  • HD 2685 b is an exoplanet orbiting the star HD 2685, located about 645.7 light-years (198.0 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star HD 2685 has apparent magnitude of 9.6, with absolute magnitude of 3.1.
  • It is 1.4 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 6801 with its spectral types of F4
  • In this planetary system, the extrasolar planet HD 2685 b orbits around the star HD 2685 every 4.1 days with its orbital distance of 0.06 AU ( 8497159.1 km)
  • (Projected orbit of HD 2685 b around its host star HD 2685)


  • The Star HD 2685 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.573 AU ( 235344099.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.175 AU ( 325307048.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.314 AU ( 495695951.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.876 AU ( 729438307.9 km)
  • Radiation at Planetary Boundary of HD 2685 b : 2004465.30 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 2685)



  • Kopparapu Recent Venus for Star HD 2685 distance : 1.535 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 2685 distance : 1.944 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 2685 distance : 1.878 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 2685 distance : 2.057 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 2685 distance : 3.369 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 2685 distance : 3.554 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 2685)



  • Original Kopparapu Recent Venus for Star HD 2685 distance : 1.572 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 2685 distance : 1.991 AU
  • Original Kopparapu Moist Greenhouse for Star HD 2685 distance : 2.080 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 2685 distance : 3.431 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 2685 distance : 3.568 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 2685)



    (Position in Stellar Map of star HD 2685 and its Exoplanet HD 2685 b)



    (Zoomed position in Stellar Map of star HD 2685 and its Exoplanet HD 2685 b (zoom level 3))