View source for Alpha Pyxidis

{{Short description|B-type giant star in the constellation Pyxis}}
{{Starbox begin}}
{{Starbox image
| image = 
   {{Location mark
 | image=Pyxis IAU.svg
 | float=center | width=250 | position=right
 | mark=Red circle.svg | mark_width=10 | mark_link=α Pyx
 | x%=55.6 | y%=60.4
   }}
| caption=Location of α Pyxidis (circled)
}}
{{Starbox observe
| epoch    = J2000
| ra       = {{RA|08|43|35.53756}}<ref name=aaa474_2_653/>
| dec      = {{DEC|−33|11|10.9898}}<ref name=aaa474_2_653/>
| appmag_v = 3.67<ref name="apjss52"/>
| constell = [[Pyxis]]
}}
{{Starbox character
| class    = B1.5III<ref name="apj157"/>
| b-v      = −0.19<ref name="apjss52"/>
| u-b      = −0.84<ref name="apjss52"/>
| variable = [[Beta Cephei variable|Beta Cephei]]<ref name="Hubrig_et_al"/>
}}
{{Starbox astrometry
| radial_v = +15.3<ref name=gcsrv/>
| prop_mo_ra  = −14.27<ref name=aaa474_2_653/>
| prop_mo_dec = +10.43<ref name=aaa474_2_653/>
| parallax = 3.71
| p_error  = 0.14
| parallax_footnote = <ref name=aaa474_2_653/>
| absmag_v = −3.47<ref name=Anderson2012/>
}}
{{Starbox detail
| mass     = 10.7<ref name="Hubrig_et_al"/>
| radius   = {{nowrap|6.3 ± 1.0}}<ref name=apjl726_1_L5/>
| luminosity  = 10,000<ref name="Hubrig_et_al"/>
| temperature = 24,300<ref name="aaa282"/>
| metal_fe = −0.18<ref name="aaa282"/>
| rotation =
| rotational_velocity = 11<ref name="aaa481"/>
| gravity  = 3.63<ref name="aaa282"/>
| age      = 
}}
{{Starbox catalog
| names = {{odlist | B=Alpha&nbsp;Pyx, α&nbsp;Pyx | CPD=−32°&nbsp;2399 | FK5=327 | HD=74575 | HIP=42828 | HR=3468 | SAO=199546 }}<ref name=SIMBAD/>
}}
{{Starbox reference
|Simbad=*+alf+Pyx
}}
{{Starbox end}}

'''Alpha Pyxidis''', [[Romanization of Greek|Latinised]] from '''α&nbsp;Pyxidis''', is a [[giant star]] in the [[constellation]] [[Pyxis]]. It is the brightest star in Pyxis, and is easily visible to the [[naked eye]]. It has a [[stellar classification]] of B1.5III and is a [[Beta Cephei variable]]. This star has more than ten times the [[mass of the Sun]] and is more than six times the [[Sun's radius]]. The surface temperature is {{val|24300|ul=K|fmt=commas}} and the star is about 10,000 times as [[Solar luminosity|luminous as the Sun]].<ref name="apj157"/><ref name="Hubrig_et_al"/><ref name="aaa282"/> Stars such as this with more than 10 solar masses are expected to end their life by exploding as a [[supernova]].<ref name=aj130_4_1652/>

[[File:AlpPyxLightCurve.png|thumb|left|A [[light curve]] for Alpha Pyxidis, plotted from ''[[Transiting Exoplanet Survey Satellite|TESS]] data.<ref name=MAST/>]]
==Naming==
In [[Chinese language|Chinese]], {{lang|zh|天狗}} ({{lang|zh-Latn|Tiān Gǒu}}), meaning ''[[Ghost (Chinese constellation)|Celestial Dog]]'', refers to an [[Asterism (astronomy)|asterism]] consisting of α Pyxidis, [[HD 73634|e Velorum]], [[KX Velorum|f Velorum]], [[β Pyxidis]], [[γ Pyxidis]] and [[δ Pyxidis]]. Consequently, α Pyxidis itself is known as {{lang|zh|天狗五}} ({{lang|zh-Latn|Tiān Gǒu wǔ}}, {{lang-en|the Fifth Star of Celestial Dog}}).<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060717.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 17 日]</ref>

==References==
{{reflist|30em|refs=

<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 }}</ref>

<ref name=MAST>{{cite web
 | title=MAST: Barbara A. Mikulski Archive for Space Telescopes
 | url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html
 | publisher=Space Telescope Science Institute | access-date=29 September 2024}}</ref>

<ref name=Anderson2012>{{citation
 | 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=. }}</ref>

<ref name=apjl726_1_L5>{{citation | last1=Hubrig | first1=S. | last2=Ilyin | first2=I. | last3=Schöller | first3=M. | last4=Briquet | first4=M. | last5=Morel | first5=T. | last6=De Cat | first6=P. | title=First Magnetic Field Models for Recently Discovered Magnetic β Cephei and Slowly Pulsating B Stars | journal=The Astrophysical Journal Letters | volume=726 | issue=1 | page=L5 |date=January 2011 | doi=10.1088/2041-8205/726/1/L5 | bibcode=2011ApJ...726L...5H |arxiv = 1012.3019 | hdl=2268/81132 | s2cid=119195567 | url=http://orbi.ulg.ac.be/bitstream/2268/81132/1/apjl_726_1_5.pdf }}</ref>

<ref name="apjss52">{{cite journal | last=Fernie | first=J. D. | title=New UBVRI photometry for 900 supergiants | journal=Astrophysical Journal Supplement Series | volume=52 |date=May 1983 | pages=7–22 | doi=10.1086/190856 | bibcode=1983ApJS...52....7F | doi-access=free }}</ref>

<ref name=gcsrv>{{cite journal | last=Wilson | first=R. E. | year=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=[[Carnegie Institute of Washington D.C.]] | bibcode=1953GCRV..C......0W }}</ref>

<ref name="aaa282">{{cite journal | last=Kilian | first=J. | title=Chemical abundances in early B-type stars. 5: Metal abundances and LTE/NLTE comparison | journal=Astronomy and Astrophysics | volume=282 | issue=3 | pages=867–873 |date=February 1994 | bibcode=1994A&A...282..867K }}</ref>

<ref name="aaa481">{{cite journal | last1=Nieva | first1=M. F. | last2=Przybilla | first2=N. | title=Carbon abundances of early B-type stars in the solar vicinity. Non-LTE line-formation for C II/III/IV and self-consistent atmospheric parameters | journal=Astronomy and Astrophysics | volume=481 | issue=1 |date=April 2008 | pages=199–216 | doi=10.1051/0004-6361:20078203 | bibcode=2008A&A...481..199N |arxiv = 0711.3783 | s2cid=10281324 }}</ref>

<ref name="apj157">{{cite journal | last1=Hiltner | first1=W. A. | last2=Garrison | first2=R. F. | last3=Schild | first3=R. E. | title=MK Spectral Types for Bright Southern OB Stars | journal=Astrophysical Journal | volume=157 | page=313 |date=July 1969 | doi=10.1086/150069 | bibcode=1969ApJ...157..313H | doi-access=free }}</ref>

<ref name=SIMBAD>{{cite simbad
 | title=alf Pyx | access-date=2021-07-29 | postscript=. }}</ref>

<ref name="Hubrig_et_al">{{cite journal | display-authors=1 | last1=Hubrig | first1=S. | last2=Briquet | first2=M. | last3=De Cat | first3=P. | last4=Schoeller | first4=M. | last5=Morel | first5=T. | last6=Ilyin | first6=I. | title=New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars | journal=Astronomische Nachrichten | volume=330 | issue=4 | page=317 |date=January 2009 | doi=10.1002/asna.200811187 | bibcode=2009AN....330..317H | arxiv=0902.1314 | s2cid=17497112 }}</ref>

<ref name=aj130_4_1652>{{cite journal | first=B. Cameron | last=Reed | title=New Estimates of the Solar-Neighborhood Massive-Stars Birthrate and the Galactic Supernova Rate | date=June 28, 2005 | doi=10.1086/444474 | journal=The Astronomical Journal | volume=130 | issue=4 | pages=1652–1657 | arxiv=astro-ph/0506708 | bibcode = 2005AJ....130.1652R | s2cid=119515135 }}</ref>

}}

==External links==
*{{cite web
 | first=James | last=Kaler | title=Alpha Pyxidis
 | publisher=[[University of Illinois]]
 | url=http://stars.astro.illinois.edu/sow/alphapyx.html
 | accessdate=2010-02-23 }}

{{Stars of Pyxis}}

{{DEFAULTSORT:Alpha Pyxidis}}
[[Category:B-type giants]]
[[Category:Beta Cephei variables]]
[[Category:Pyxis]]
[[Category:Bayer objects|Pyxidis, Alpha]]
[[Category:Durchmusterung objects|PD-32 02399]]
[[Category:Henry Draper Catalogue objects|074575]]
[[Category:Hipparcos objects|042828]]
[[Category:Bright Star Catalogue objects|3468]]