Imaginary Picture of HD 8673 A b

Display orbital revolution of HD 8673 A b around the hoststar HD 8673 A
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Exoplanet Name : HD 8673 A b
Alternate Name : HD 8673 b
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 14.2000 (Mjup) 4514.7196 (Mearth)
Semi Major Axis / Orbital Distance Calculated 3.0200 (AU) 3.0200 (AU Est.)
Eccentricity : 0.7230
Orbital Period(Yrs) 4.4735
Orbital Period(Observed/Estimated) 1634.00 (Days Obs.) 1649.81 (Days Est.)
Surface Gravity (G Earth) 43.6002
Star Radiation at Atmospheric Boundary: 455.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 206.2 (K)
Blackbody T 0.3(K) 193.7 (K)
Blackbody T 0.7(K) 156.7 (K)
Tidally Locked Blackbody T 0.1(K) 245.2 (K)
Tidally Locked Blackbody T 0.3(K) 230.3 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 8673 A
Alternate Name : HD 8673
Star Distance(LY) : 123.6
Stellar Radius(Rsun) : 1.4 (Rsun Measured)
Stellar Mass(Msun) : 1.4 (Msun Measured) 1.4 (Msun Estimated)
Star Age : 1.9 (GY)
Temperature : 6472 (K)
Spectral type : F7 V
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : 0.1
Absolute Magnitude: 4.7
Apparent Magnitude: 7.6
Right Ascension(RA) 21.5366
Declination (DEC) 34.5794
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Lewis C. Roberts, Jr., Brian D. Mason, Christopher R. Neyman, Yanqin Wu, Reed L. Riddle, J. Christopher Shelton, John Angione, Christoph Baranec, Antonin Bouchez, Khanh Bui, Rick Burruss, Mahesh Burse, Pravin Chordia, Ernest Croner, Hillol Das, Richard G. Dekany, Stephen Guiwits, David Hale, John Henning, Shrinivas Kulkarni Nicholas Law, Dan McKenna, Jennifer Milburn, Dean Palmer, Sujit Punnadi, A.N. Ramaprakash, Jennifer E. Roberts, Shriharsh P. Tendulkar, Thang Trinh, Mitchell Troy, Tuan Truong, Jeff Zolkower"
Discovery Paper - Title "Know The Star, Know the Planet. IV. A Stellar Companion to the Host star of the Eccentric Exoplanet HD 8673b"
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+8673+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%208673%20b/
HD 8673 A b
HD 8673 A b
  • HD 8673 A b is an exoplanet orbiting the star HD 8673 A, located about 123.6 light-years (37.9 pc) away from Solar System. Its discovery was publicly announced on 2010.
  • The host star HD 8673 A has apparent magnitude of 7.6, with absolute magnitude of 4.7.
  • It is 1.4 times more massive and 1.4 times bigger compared with our Sun. The surface temperature is 6472 with its spectral types of F7 V
  • In this planetary system, the extrasolar planet HD 8673 A b orbits around the star HD 8673 A every 1634.0 days with its orbital distance of 3.02 AU ( 451785569.5 km)
    • (Projected orbit of HD 8673 A b around its host star HD 8673 A)


  • The Star HD 8673 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.261 AU ( 188690454.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.743 AU ( 260819518.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.657 AU ( 397431226.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.909 AU ( 584837460.7 km)
  • Radiation at Planetary Boundary of HD 8673 A b : 455.80 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 8673 A)



  • Kopparapu Recent Venus for Star HD 8673 A distance : 1.254 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 8673 A distance : 1.588 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 8673 A distance : 1.533 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 8673 A distance : 1.680 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 8673 A distance : 2.763 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 8673 A distance : 2.914 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 8673 A)



  • Original Kopparapu Recent Venus for Star HD 8673 A distance : 1.274 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 8673 A distance : 1.628 AU
  • Original Kopparapu Moist Greenhouse for Star HD 8673 A distance : 1.686 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 8673 A distance : 2.813 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 8673 A distance : 2.926 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 8673 A)



    (Position in Stellar Map of star HD 8673 A and its Exoplanet HD 8673 A b)



    (Zoomed position in Stellar Map of star HD 8673 A and its Exoplanet HD 8673 A b (zoom level 3))

    (Synthetic Spectrum of star HD 8673 A*)
    *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