HD 168443
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HD 168443 is an ordinary yellow-hued star in the Serpens Cauda segment of the equatorial constellation of Serpens. It is known to have two substellar companions. With an apparent visual magnitude of 6.92,<ref name=Anderson_Francis_2012/> the star lies just below the nominal lower brightness limit of visibility to the normal human eye. This system is located at a distance of 127 light years from the Sun based on parallax,<ref name="Gaia DR3"/> but is drifting closer with a radial velocity of −48.7 km/s.<ref name=Anderson_Francis_2012/>
This stellar object is a core hydrogen fusing G-type main-sequence star with a classification of G6V, although it is likely evolved<ref name=Pilyavsky_et_al_2011/> with an age of around 11 billion years.<ref name=Anderson_Francis_2012/> It is slightly lower in mass than the Sun but has a radius that is larger by 51%. The star is spinning with a leisurely projected rotational velocity of 2.2 km/s<ref name=Pilyavsky_et_al_2011/> and it has a very inactive chromosphere.<ref name=Gray_et_al_2006/><ref name=Pilyavsky_et_al_2011/> It is radiating 2.4<ref name="Gaia DR2"/> times the luminosity of the Sun from its photosphere at an effective temperature of 5,491 K.<ref name=Pilyavsky_et_al_2011/>
Planetary systemEdit
HD 168443 is known to be orbited by a super-Jupiter exoplanet, discovered in 1999, and a brown dwarf, discovered in 2001. The brown dwarf takes 30 times longer to orbit the star than the planet.<ref name="Marcy1999"/><ref name="Marcy2001"/><ref name="Reffert2006"/> Both have eccentric orbits.<ref name=Pilyavsky_et_al_2011/> An orbital fit to Hipparcos astrometric data suggested the brown dwarf has a mass of Template:Val.<ref name="Reffert2006"/> A 2022 study utilizing both Hipparcos and Gaia data instead measured a true mass of Template:Jupiter mass for HD 168443 c, close to the minimum mass.<ref name="Feng2022"/> Test simulations of massless particles orbiting in between these two bodies show that all such objects are quickly ejected within two million years. That suggests any other planetary companions would be orbiting further out from the star.<ref name=Barnes2004/>
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See alsoEdit
- HD 38529
- List of exoplanets discovered before 2000 - HD 168443 b
- List of exoplanets discovered between 2000–2009 - HD 168443 c