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#REDIRECT [[List of largest stars#RX Telescopii]]
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{{Short description|Red supergiant star in the constellation Telescopium}}
{{starbox begin}}
{{Starbox image
| image = [[Image:RXTelLightCurve.png|250px]]
| caption = A [[Photometric_system#Photometric_letters|visual band]] [[light curve]] for RX Telescopii, plotted from ''[[All Sky Automated Survey|ASAS]]'' data<ref name=ASASServer/>
}}
{{Starbox observe
|epoch=J2000.0
|ra= {{RA|19|06|58.206}}<ref name="Gaia DR3"/>
|dec= {{DEC|-45|58|13.54}}<ref name="Gaia DR3"/>
|constell= [[Telescopium]]
|appmag_v = 6.45 - 7.47<ref name=AAVSORX/>
}}
{{Starbox character
|type =[[Red supergiant]]
|class= M3Iab<ref name=AAVSORX/>
|variable=[[slow irregular variable|LC]]<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
}}
{{Starbox astrometry
| radial_v = {{val|19.87|0.64}}<ref name="edr3"/>
| prop_mo_ra = 2.285{{±|0.092}}<ref name="edr3"/>
| prop_mo_dec = -6.520<ref name=edr3/>
| parallax = 0.4914
| p_error = 0.0810
| parallax_footnote = <ref name=edr3>{{cite Gaia EDR3|6662929658466129920}}</ref>
| absmag_v =
| dist_ly = {{val|7136|1783|1245}}
| dist_pc = {{val|2189|547|382|u=pc}}
| dist_footnote = <ref name="b-h"/>
}}
{{Starbox detail
| mass = 25-35<ref name=wright2003>{{cite journal |bibcode=2003AJ....125..359W |title=The Tycho-2 Spectral Type Catalog |last1=Wright |first1=Candace O. |last2=Egan |first2=Michael P. |last3=Kraemer |first3=Kathleen E. |last4=Price |first4=Stephan D. |journal=The Astronomical Journal |year=2003 |volume=125 |issue=1 |page=359 |doi=10.1086/345511 |s2cid=122781581 |doi-access=free }}</ref>
| temperature = 3,757.8<ref name="Gaia DR3"/>
| luminosity = 340,000
| radius= {{solar radius calculator|type=AD|3.704|2.189}}{{Efn|From an angular diameter of 3.704 [[milliarcsecond]]s <ref name="cruzalèbes"/> and a distance of 2,189 parsecs.<ref name="b-h"/>|name=Radius}}; 322<ref name="Gaia DR3"/>
| age_myr =
}}
{{Starbox catalogue
|names={{odlist|CD=-46°12809|HD=177456|SAO=229497|Gaia DR3=6662929658466129920}}<ref name=SIMBAD>{{cite simbad |title=V* RX Tel |accessdate = 26 June 2020}}</ref>
}}
{{Starbox reference
|Simbad=RX+Tel
}}
{{Starbox end}}
{{Sol
'''RX Telescopii''' is an [[irregular variable]] star in the constellation [[Telescopium]]. It has a maximum magnitude of 6.45 and a minimum magnitude 7.47. It is a [[red supergiant]] with a spectral type of M3Iab, indicating the star is an intermediate-size luminous supergiant star.<ref name=AAVSORX>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=36259 |title=RX Telescopii |last=BSJ|date=11 November 2011|work=AAVSO Website|publisher=[[American Association of Variable Star Observers]]|access-date=26 June 2014}}</ref>

The distance to RX Telescopii is uncertain. It has a [[Gaia Data Release 2]] parallax of {{val|0.1699|0.0790|ul=mas}},<ref name=dr2>{{cite DR2|6662929654167476992}}</ref> suggesting a distance around {{val|6,000|fmt=commas|ul=parsecs}}.<ref name=dr2/> A more rigorous statistical calculation gives a distance of {{val|4,726|2,371|1,315|fmt=commas|ul=pc}},<ref name=bailer-jones2019>{{cite journal |bibcode=2018AJ....156...58B |title=Estimating Distance from Parallaxes. IV. Distances to 1.33 Billion Stars in Gaia Data Release 2 |last1=Bailer-Jones |first1=C. A. L. |last2=Rybizki |first2=J. |last3=Fouesneau |first3=M. |last4=Mantelet |first4=G. |last5=Andrae |first5=R. |journal=The Astronomical Journal |year=2018 |volume=156 |issue=2 |pages=58 |doi=10.3847/1538-3881/aacb21 |arxiv=1804.10121 |s2cid=119289017 |doi-access=free }}</ref> suggesting a radius of {{solar radius|1,897|link=y}} using an angular diameter of {{val|3.734|ul=mas}},<ref name="cruzalèbes"/> which would make it one of the [[List of largest known stars|largest stars]] discovered and its photosphere engulf the orbit of Jupiter, and nearing that of Saturn if it was placed in the [[Solar System]]. However the Gaia database has an astrometric noise value larger than the parallax itself and about ten times larger than the typical maximum for a reliable parallax, thus this distance, hence the radius, are inaccurate.<ref name=dr2/> Bailer-Jones ''et al.'' (2021) publised a photogeometric distance of {{val|2189|547|382|u=pc}} for RX Telescopii, corresponding to a smaller radius of {{solar radius calculator|type=AD|3.734|2.189}}{{nbsp}}{{solar radius}} using a uniform disk darkened angular diameter of 3.704 mas.<ref name="b-h"/><ref name="cruzalèbes"/> [[Gaia DR3]] published a much smaller radius of {{Solar radius|322}} for this star, together with a much smaller distance of {{Val|845|25|28|u=pc}}.<ref name="Gaia DR3">{{Cite Gaia DR3|}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=I/355&Source=6662929658466129920 Gaia DR3 record for this source] at [[VizieR]].</ref>

==Notes==
{{Notelist}}

==References==
{{reflist|refs=

<ref name=ASASServer>{{cite web |title=ASAS All Star Catalogue |url=http://www.astrouw.edu.pl/asas/?page=aasc |publisher=The All Sky Automated Survey |access-date=8 December 2021}}</ref>

<ref name="b-h">{{Cite journal |last1=Bailer-Jones |first1=C. A. L. |last2=Rybizki |first2=J. |last3=Fouesneau |first3=M. |last4=Demleitner |first4=M. |last5=Andrae |first5=R. |date=2021-03-01 |title=Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3 |journal=The Astronomical Journal |volume=161 |issue=3 |pages=147 |doi=10.3847/1538-3881/abd806 |doi-access=free |arxiv=2012.05220 |bibcode=2021AJ....161..147B |issn=0004-6256}} Data about this star can be seen [https://dc.zah.uni-heidelberg.de/gedr3dist/q/cone/form here].</ref>

<ref name="cruzalèbes">{{cite journal|last1=Cruzalèbes|first1=P.|last2=Petrov|first2=R. G.|last3=Robbe-Dubois|first3=S.|last4=Varga|first4=J.|last5=Burtscher|first5=L.|last6=Allouche|first6=F.|last7=Berio|first7=P.|last8=Hofmann|first8=K. H.|last9=Hron|first9=J.|last10=Jaffe|first10=W.|last11=Lagarde|first11=S.|year=2019|title=A catalogue of stellar diameters and fluxes for mid-infrared interferometry|journal=Monthly Notices of the Royal Astronomical Society|volume=490|issue=3|pages=3158–3176|arxiv=1910.00542|bibcode=2019MNRAS.490.3158C|doi=10.1093/mnras/stz2803|first12=B.|last12=Lopez|first13=A.|last13=Matter|last14=Meilland|first14=A.|last15=Meisenheimer|first15=K.|last16=Millour|first16=F.|last17=Schertl|first17=D.|s2cid=203610229}}</ref>


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{{Stars of Telescopium}}

{{DEFAULTSORT:RX Telescopii}}
[[Category:Telescopium]]
[[Category:Slow irregular variables]]
[[Category:Objects with variable star designations|Telescopii, RX]]
[[Category:M-type supergiants]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|177456]]
[[Category:TIC objects]]

Latest revision as of 09:24, 12 June 2024

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