Xi Telescopii
{{Short description|Star in the constellation Telescopus}}
{{Starbox begin
| name = Xi Telescopii
}}
{{Starbox image
| image = 250px
| caption = A light curve for Xi Telescopii, plotted from Hipparcos data
}}
{{Starbox observe
| epoch = J2000.0
| constell = Telescopium
| dec = {{DEC|−52|52|50.8490}}
| appmag_v = 4.95 {{nowrap|(+4.89 – 4.94)}}
}}
{{Starbox character
| type = red giant branch
| class = K5 III or M1 IIab
| r-i =
| variable = LB:
}}
{{Starbox astrometry
| parallax = 3.02
| p_error = 0.35
}}
{{Starbox detail
| source =
| metal_fe =
| rotational_velocity =
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | B=ξ Tel | CPD=−53°9794 | FK5=755 | HD=190421 | HIP=99120 | HR=7673 | SAO=246443 }}
}}
{{Starbox reference
| Simbad = ksi+Tel
}}
{{Starbox end}}
Xi Telescopii, Latinized from ξ Telescopii, is a solitary star in the southern constellation of Telescopium. It is visible to the naked eye, with an apparent visual magnitude of +4.95. Based upon an annual parallax shift of 3.02 mas as measured from Earth, it is located approximately 1,100 light-years from the Sun.
This is an evolved star with a stellar classification of K5 III or M1 IIab, indicating it is a giant or bright giant star. This is a variable star tentatively classified as a slow irregular-type variable with a brightness that varies between magnitude +4.89 and +4.94. Koen and Eyer examined the Hipparcos data for this star, and found that it varied periodically, with a period of 12.36 days, and an amplitude of 0.0083 magnitudes. With around 56 times the Sun's radius, it shines with a luminosity approximately 2,973 times that of the Sun and has a surface temperature of {{Val|4030|fmt=commas|ul=K}}.
References
{{reflist|refs=
{{cite Gaia DR3|6665511449204071424}}
| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats
| website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats
| publisher=Strasbourg astronomical Data Center |access-date=15 October 2022}}
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| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}
| last1=Koen | first1=Chris | last2=Eyer | first2=Laurent
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| journal=Monthly Notices of the Royal Astronomical Society
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| doi=10.1046/j.1365-8711.2002.05150.x | arxiv=astro-ph/0112194 | bibcode=2002MNRAS.331...45K | doi-access=free}}
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| work=Veröffentlichungen Astronomisches Rechen-Institut Heidelberg
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| doi=10.1086/190856 | bibcode=1983ApJS...52....7F | doi-access=free }}
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| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}
| last1=Houk | first1=Nancy | last2=Cowley | first2=A. P.
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=1 | location=Ann Arbor
| publisher=Dept. of Astronomy, University of Michigan
| year=1978 | bibcode=1975mcts.book.....H | postscript=. }}
| display-authors=1 | last1=McDonald | first1=I.
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| title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars
| journal=Monthly Notices of the Royal Astronomical Society
| volume=427 | issue=1 | pages=343–57 | date=2012
| bibcode=2012MNRAS.427..343M | arxiv=1208.2037
| doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 | postscript=. }}
| title=NSV 12783 | last1=Watson | first1=Christopher
| date=May 3, 2013 | work=AAVSO Website
| publisher=American Association of Variable Star Observers
| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=51407
| access-date=2017-06-03 }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}
| title=ksi Tel
| access-date=2017-06-01 }}
}}
{{Stars of Telescopium|state=collapsed}}
{{DEFAULTSORT:Xi Telescopii}}