Imaginary Picture of HD 195689 b
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Exoplanet Name : HD 195689 b
Alternate Name : KELT-9 b
Radius (Rjup / Re): 1.8400 (Rjup) 20.6246 (Rearth)
Mass (Mjup / Me): 2.8800 (Mjup) 915.6614 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0337 (AU) 0.0337 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0041
Orbital Period(Observed/Estimated) 1.48 (Days Obs.) 0.00 (Days Est.)
Star Radiation at Atmospheric Boundary: 28918917.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 3272.9 (K)
Blackbody T 0.3(K) 3073.6 (K)
Blackbody T 0.7(K) 2486.9 (K)
Tidally Locked Blackbody T 0.1(K) 3892.2 (K)
Tidally Locked Blackbody T 0.3(K) 3655.2 (K)
Size Class: Super-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Spectrum
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 195689
Alternate Name : KELT-9
Star Distance(LY) : 670.8
Stellar Radius(Rsun) : 1.6 (Rsun Estimated)
Stellar Mass(Msun) : 0.0 (Msun Measured) 2.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 10170 (K)
Spectral type : A0
Metalicity : 0.0
Absolute Magnitude: 1.0
Apparent Magnitude: 7.6
Right Ascension(RA) 307.8598
Declination (DEC) 39.9388
Hubble Space Telescope Guide Star Catalog (GSC) ID 03157-00638
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+195689+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 195689 b
HD 195689 b

  • HD 195689 b is an exoplanet orbiting the star HD 195689, located about 670.8 light-years (205.7 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star HD 195689 has apparent magnitude of 7.6, with absolute magnitude of 1.0.
  • In this planetary system, the extrasolar planet HD 195689 b orbits around the star HD 195689 every 1.5 days with its orbital distance of 0.03 AU ( 5038456.3 km)
  • (Projected orbit of HD 195689 b around its host star HD 195689)


  • The Star HD 195689 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 3.543 AU ( 530052403.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 4.898 AU ( 732670941.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 7.463 AU ( 1116428374.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 10.982 AU ( 1642873260.9 km)
  • Radiation at Planetary Boundary of HD 195689 b : 28918917.79 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 195689)



  • Kopparapu Recent Venus for Star HD 195689 distance : 5.079 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 195689 distance : 6.441 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 195689 distance : 6.242 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 195689 distance : 6.741 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 195689 distance : 11.495 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 195689 distance : 12.088 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 195689)



  • Original Kopparapu Recent Venus for Star HD 195689 distance : 4.157 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 195689 distance : 6.447 AU
  • Original Kopparapu Moist Greenhouse for Star HD 195689 distance : 5.501 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 195689 distance : 11.437 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 195689 distance : 11.894 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 195689)



    (Position in Stellar Map of star HD 195689 and its Exoplanet HD 195689 b)



    (Zoomed position in Stellar Map of star HD 195689 and its Exoplanet HD 195689 b (zoom level 3))