Imaginary Picture of HD 219666 b
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Exoplanet Name : HD 219666 b
Alternate Name :
Radius (Rjup / Re): 0.4200 (Rjup) 4.7078 (Rearth)
Mass (Mjup / Me): 0.0522 (Mjup) 16.5964 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0636 (AU) 0.0636 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0165
Orbital Period(Observed/Estimated) 6.04 (Days Obs.) 6.10 (Days Est.)
Star Radiation at Atmospheric Boundary: 300517.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1045.0 (K)
Blackbody T 0.3(K) 981.4 (K)
Blackbody T 0.7(K) 794.0 (K)
Tidally Locked Blackbody T 0.1(K) 1242.7 (K)
Tidally Locked Blackbody T 0.3(K) 1167.0 (K)
Size Class: Neptune-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 219666
Alternate Name :
Star Distance(LY) : 308.0
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 10.0 (GY)
Temperature : 5527 (K)
Spectral type : G7
Metalicity : 0.0
Absolute Magnitude: 17.1
Apparent Magnitude: 22.0
Right Ascension(RA) 349.5568
Declination (DEC) -56.9038
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=HD+219666+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 219666 b
HD 219666 b

  • HD 219666 b is an exoplanet orbiting the star HD 219666, located about 308.0 light-years (94.4 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star HD 219666 has apparent magnitude of 22.0, with absolute magnitude of 17.1.
  • It is 0.9 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5527 with its spectral types of G7
  • In this planetary system, the extrasolar planet HD 219666 b orbits around the star HD 219666 every 6.0 days with its orbital distance of 0.06 AU ( 9508440.7 km)
  • (Projected orbit of HD 219666 b around its host star HD 219666)


  • The Star HD 219666 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.682 AU ( 101970433.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.942 AU ( 140949787.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.436 AU ( 214776283.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.113 AU ( 316052710.5 km)
  • Radiation at Planetary Boundary of HD 219666 b : 300517.21 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 219666)



  • Kopparapu Recent Venus for Star HD 219666 distance : 0.717 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 219666 distance : 0.908 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 219666 distance : 0.877 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 219666 distance : 0.962 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 219666 distance : 1.615 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 219666 distance : 1.703 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 219666)



  • Original Kopparapu Recent Venus for Star HD 219666 distance : 0.715 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 219666 distance : 0.934 AU
  • Original Kopparapu Moist Greenhouse for Star HD 219666 distance : 0.946 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 219666 distance : 1.643 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 219666 distance : 1.709 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 219666)



    (Position in Stellar Map of star HD 219666 and its Exoplanet HD 219666 b)



    (Zoomed position in Stellar Map of star HD 219666 and its Exoplanet HD 219666 b (zoom level 3))