kappa Pyxidis
{{short description|Star in the constellation Pyxis}}
{{Starbox begin
| name = κ Pyxidis
}}
{{Starbox image
| image=
{{Location mark
|image=Pyxis constellation map.svg|alt=|float=center|width=240
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=κ Pyxidis
|x=399|y=392
}}
|caption=Location of κ Pyxidis (circled)
}}
{{Starbox observe
| epoch = J2000
| constell = Pyxis
| dec = {{DEC|–25|51|30.7331}}
}}
{{Starbox character
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|−44.7|2.8}}
| parallax = 6.3116
| p_error = 0.2408
}}
{{Starbox detail
| mass =
| radius = {{Val|66.70|0.34|2.34}}
| temperature = {{Val|3931|31|fmt=commas}}
| metal_fe = {{Val|−0.22|0.08}}
| rotation =
| rotational_velocity =
| age =
}}
{{Starbox catalog
| names= {{odlist | B=κ Pyx | CPD=−25°4067 | HD=78541 | HIP=44824 | HR=3628 | SAO=177002 | CCDM=J09080-2552AB | GC=12614 | IDS=09037-2527 AB | PPM=255695 | WDS=J09080-2552AB }}
}}
{{Starbox reference
|Simbad=kap+Pyx
}}
{{Starbox end}}
Kappa Pyxidis, Latinized from κ Pyxidis, is a single, orange-hued star in the southern constellation of Pyxis. It is visible to the naked eye as a faint point of light with an apparent visual magnitude of +4.62. The star is located approximately 520 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −45 km/s and may come as close as {{Convert|94.37|pc|ly|0|disp=out|abbr=off}} in around 2.6 million years. It is moving through space at the rate of 53.7 km/s relative to the Sun and is following an orbit through the Milky Way galaxy with a large eccentricity of 0.68
This is an aging giant with a stellar classification of K4III, having exhausted the supply of hydrogen at its core then expanded and cooled. At present it has 67 times the radius of the Sun. It is a variable star of uncertain type, changing brightness with an amplitude of 0.0058 in visual magnitude over a period of 8.5 days. The star radiates 927 times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,931 K. A magnitude 10 visual companion is located at an angular separation of {{Val|2.1|ul=arcseconds}}.
References
{{reflist|refs=
{{cite simbad | title=kap Pyx | accessdate=2019-09-14 }}
{{cite DR2|5650133695271628928}}
| display-authors=1
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| page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}
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| bibcode=2011A&A...531A.165P | arxiv=1104.4952 | s2cid=54940439 }}
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| journal = Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869 | date=2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=.
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}
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| title=New periodic variables from the Hipparcos epoch photometry
| journal=Monthly Notices of the Royal Astronomical Society
| volume=331 | pages=45–59 | year=2002
| issue=1 | bibcode=2002MNRAS.331...45K | arxiv=astro-ph/0112194
| doi=10.1046/j.1365-8711.2002.05150.x | doi-access=free | s2cid=10505995 | postscript=. }}
| last1=Privett | first1=Grant | last2=Jones | first2=Kevin
| title=The Constellation Observing Atlas
| publisher=Springer Science & Business Media
| location=New York, New York | postscript=.
| date=2013 | pages=168 | bibcode=2013coa..book.....P | isbn=9781461476481
| url=https://books.google.com/books?id=uN69BAAAQBAJ&pg=PA168}}
}}
{{Stars of Pyxis}}
{{DEFAULTSORT:Kappa Pyxidis}}