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{{short description|Star in the constellation Pisces}}
{{Starbox begin
{{Starbox begin
| name = Omicron Piscium
| name = Omicron Piscium
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}}
}}
{{Starbox character
{{Starbox character
| type=[[Horizontal branch]]<ref name=Alves2000/>
| class = K0&nbsp;III<ref name=Setaiwan2004/>
| class = K0&nbsp;III<ref name=Setaiwan2004/>
| b-v = +0.959<ref name=Jennens1975/>
| b-v = +0.959<ref name=Jennens1975/>
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| source = <ref name=Jofre2015/>
| source = <ref name=Jofre2015/>
| mass = 3.03
| mass = 3.03
| radius = 14.57
| radius = {{val|14.38|0.21}}<ref name=Baines2023/>
| luminosity = 132
| luminosity = 132
| temperature = 5,004
| temperature = 5,004
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'''Omicron Piscium''' ('''ο Piscium''', abbreviated '''Omi Psc''', '''ο Psc''') is a [[binary star]] in the [[constellation]] of [[Pisces (constellation)|Pisces]]. It is visible to the naked eye, having an [[Apparent magnitude|apparent visual magnitude]] of 4.27.<ref name=Setaiwan2004/> Based upon an annual [[parallax]] shift of 11.67&nbsp;[[Minute and second of arc#Symbols and abbreviations|mas]] as seen from the Earth,<ref name=vanLeeuwen2007/> the system is located roughly 280&nbsp;[[light-year]]s from the [[Sun]]. It is positioned near the [[ecliptic]], so is subject to [[occultation]] by the [[Moon]].<ref name=Richichi2016a/> It is a member of the [[thin disk]] population of the [[Milky Way]].<ref name=Jofre2015/>
'''Omicron Piscium''' ('''ο Piscium''', abbreviated '''Omi Psc''', '''ο Psc''') is a [[binary star]] in the [[constellation]] of [[Pisces (constellation)|Pisces]]. It is visible to the naked eye, having an [[Apparent magnitude|apparent visual magnitude]] of 4.27.<ref name=Setaiwan2004/> Based upon an annual [[parallax]] shift of 11.67&nbsp;[[Minute and second of arc#Symbols and abbreviations|mas]] as seen from the Earth,<ref name=vanLeeuwen2007/> the system is located roughly 280&nbsp;[[light-year]]s from the [[Sun]]. It is positioned near the [[ecliptic]], so is subject to [[occultation]] by the [[Moon]].<ref name=Richichi2016a/> It is a member of the [[thin disk]] population of the [[Milky Way]].<ref name=Jofre2015/>


The two components are designated Omicron Piscium A (formally named '''Torcular''' {{IPAc-en|'|t|ɔr|k|j|ʊ|l|@r}})<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=16 December 2017}}</ref> and B.
The two components are designated Omicron Piscium A (formally named '''Torcular''' {{IPAc-en|'|t|ɔr|k|j|ʊ|l|@r}})<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=16 December 2017}}</ref> and B.


== Nomenclature ==
== Nomenclature ==
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''ο Piscium'' ([[Latinisation of names|Latinised]] to ''Omicron Piscium'') is the system's [[Bayer designation]]. The designations of the two components as ''Omicron Piscium A'' and ''B'' derives from the convention used by the Washington Multiplicity Catalog (WMC) for [[Star system|multiple star system]]s, and adopted by the [[International Astronomical Union]] (IAU).<ref name="planetnaming">{{cite arXiv |title=On the naming convention used for multiple star systems and extrasolar planets |date=2010 |eprint=1012.0707 |class=astro-ph.SR |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. }}</ref>
''ο Piscium'' ([[Latinisation of names|Latinised]] to ''Omicron Piscium'') is the system's [[Bayer designation]]. The designations of the two components as ''Omicron Piscium A'' and ''B'' derives from the convention used by the Washington Multiplicity Catalog (WMC) for [[Star system|multiple star system]]s, and adopted by the [[International Astronomical Union]] (IAU).<ref name="planetnaming">{{cite arXiv |title=On the naming convention used for multiple star systems and extrasolar planets |date=2010 |eprint=1012.0707 |class=astro-ph.SR |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. }}</ref>


The system bore the traditional name ''Torcularis septentrionalis'', taken from the 1515 [[Almagest]]. The name is translated from the [[Greek language|Greek]] ληνός ('full'), which was "erroneously written for λίνος" ('linen').<ref name=Allen1963/> In 2016, the IAU organized a [[IAU Working Group on Star Names|Working Group on Star Names]] (WGSN)<ref name="WGSN">{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|accessdate=22 May 2016}}</ref> to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire [[multiple star|multiple systems]].<ref name="TriRpt18">{{cite web | url=https://www.iau.org/enwiki/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015-2018) - Star Names |accessdate=2018-07-14}}</ref> It approved the name ''Torcular'' for the component Omicron Piscium A on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>
The system bore the traditional name ''Torcularis septentrionalis'', taken from the 1515 [[Almagest]]. The name is translated from the [[Greek language|Greek]] ληνός ('full'), which was "erroneously written for λίνος" ('linen').<ref name=Allen1963/> In 2016, the IAU organized a [[IAU Working Group on Star Names|Working Group on Star Names]] (WGSN)<ref name="WGSN">{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}}</ref> to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire [[multiple star|multiple systems]].<ref name="TriRpt18">{{cite web | url=https://www.iau.org/enwiki/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015-2018) - Star Names |access-date=2018-07-14}}</ref> It approved the name ''Torcular'' for the component Omicron Piscium A on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>


In [[Chinese astronomy|Chinese]], {{lang|zh|右更}} ({{lang|zh-Latn|Yòu Gèng}}), meaning ''[[Bond (Chinese constellation)|Official in Charge of the Pasturing]]'', refers to an [[Asterism (astronomy)|asterism]] consisting of Omicron Piscium, [[Eta Piscium]], [[Rho Piscium]], [[Pi Piscium]] and [[104 Piscium]]. Consequently, the [[Chinese star names|Chinese name]] for Omicron Piscium itself is {{lang|zh|右更四}} ({{lang|zh-Latn|Yòu Gèng sì}}, {{lang-en|the Fourth Star of Official in Charge of the Pasturing}}.)<ref>{{cite web|language=zh |url=http://aeea.nmns.edu.tw/2006/0605/ap060519.html |title=AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 |date= 2006-05-19}}</ref>
In [[Chinese astronomy|Chinese]], {{lang|zh|右更}} ({{lang|zh-Latn|Yòu Gèng}}), meaning ''[[Bond (Chinese constellation)|Official in Charge of the Pasturing]]'', refers to an [[Asterism (astronomy)|asterism]] consisting of Omicron Piscium, [[Eta Piscium]], [[Rho Piscium]], [[Pi Piscium]] and [[104 Piscium]]. Consequently, the [[Chinese star names|Chinese name]] for Omicron Piscium itself is {{lang|zh|右更四}} ({{lang|zh-Latn|Yòu Gèng sì}}, {{langx|en|the Fourth Star of Official in Charge of the Pasturing}}.)<ref>{{cite web |language=zh |url=http://aeea.nmns.edu.tw/2006/0605/ap060519.html |title=AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 |date=2006-05-19 |access-date=2012-08-30 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303170659/http://aeea.nmns.edu.tw/2006/0605/ap060519.html |url-status=dead }}</ref>


== Properties ==
== Properties ==
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==References==
==References==
{{reflist|refs=
{{reflist|refs=

<ref name=Baines2023>{{Cite journal |last1=Baines |first1=Ellyn K. |last2=Blomquist |first2=Solvay |last3=Clark III |first3=James H. |last4=Gorney |first4=Jim |last5=Maier |first5=Erin |last6=Sanborn |first6=Jason |last7=Schmitt |first7=Henrique R. |last8=Stone |first8=Jordan M. |last9=van Belle |first9=Gerard T. |last10=Braun |first10=Kaspar von |date=2023-01-09 |title=Simultaneous Six-way Observations from the Navy Precision Optical Interferometer |journal=The Astronomical Journal |language=en |volume=165 |issue=2 |pages=41 |doi=10.3847/1538-3881/aca277 |doi-access=free |bibcode=2023AJ....165...41B |issn=0004-6256}}</ref>


<ref name=vanLeeuwen2007>{{citation
<ref name=vanLeeuwen2007>{{citation
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| journal=Monthly Notices of the Royal Astronomical Society
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>


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<ref name=Allen1963>{{citation
<ref name=Allen1963>{{citation
| chapter-url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Pisces*.html
| chapter-url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Pisces*.html
| title=Star Names — Their Lore and Meaning
| title=Star Names — Their Lore and Meaning
| chapter=Pisces, the Fishes | publisher=Dover | year=1963
| chapter=Pisces, the Fishes | publisher=Dover | year=1963
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| volume=151 | issue=1 | id=10 | pages=5 | date=January 2016
| volume=151 | issue=1 | id=10 | pages=5 | date=January 2016
| doi=10.3847/0004-6256/151/1/10 | bibcode=2016AJ....151...10R | s2cid=119258140
| doi=10.3847/0004-6256/151/1/10 | bibcode=2016AJ....151...10R | s2cid=119258140
| doi-access=free
}}</ref>
}}</ref>


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<ref name=SIMBAD>{{cite simbad
<ref name=SIMBAD>{{cite simbad
| title=omi Psc | accessdate=2017-07-25 | postscript=. }}</ref>
| title=omi Psc | access-date=2017-07-25 }}</ref>


}}
}}
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{{Stars of Pisces|state=collapsed}}
{{Stars of Pisces|state=collapsed}}


{{DEFAULTSORT:Omicron Piscium}}
[[Category:K-type giants]]
[[Category:K-type giants]]
[[Category:Horizontal-branch stars]]
[[Category:Horizontal-branch stars]]
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[[Category:Henry Draper Catalogue objects|010761]]
[[Category:Henry Draper Catalogue objects|010761]]
[[Category:Hipparcos objects|008198]]
[[Category:Hipparcos objects|008198]]
[[Category:HR objects|0510]]
[[Category:Bright Star Catalogue objects|0510]]

Latest revision as of 02:15, 15 November 2024

Omicron Piscium
Location of ο Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 45m 23.63185s[1]
Declination +09° 09′ 27.8530″[1]
Apparent magnitude (V) 4.27[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type K0 III[2]
U−B color index +0.736[4]
B−V color index +0.959[4]
Astrometry
Proper motion (μ) RA: +72.98[1] mas/yr
Dec.: +39.30[1] mas/yr
Parallax (π)11.67 ± 0.67 mas[1]
Distance280 ± 20 ly
(86 ± 5 pc)
Absolute magnitude (MV)−0.22[2]
Details[5]
Mass3.03 M☉
Radius14.38±0.21[6] R☉
Luminosity132 L☉
Surface gravity (log g)2.57 cgs
Temperature5,004 K
Metallicity [Fe/H]0.10 dex
Rotational velocity (v sin i)2.88 km/s
Age390 Myr
Other designations
Torcular, Torcularis Septentrionalis, ο Psc, 110 Piscium, BD+08° 273, FK5 60, GC 2139, HD 10761, HIP 8198, HR 510, SAO 110110, PPM 144950[7]
Database references
SIMBADdata

Omicron Piscium (ο Piscium, abbreviated Omi Psc, ο Psc) is a binary star in the constellation of Pisces. It is visible to the naked eye, having an apparent visual magnitude of 4.27.[2] Based upon an annual parallax shift of 11.67 mas as seen from the Earth,[1] the system is located roughly 280 light-years from the Sun. It is positioned near the ecliptic, so is subject to occultation by the Moon.[8] It is a member of the thin disk population of the Milky Way.[5]

The two components are designated Omicron Piscium A (formally named Torcular /ˈtɔːrkjʊlər/)[9] and B.

Nomenclature

[edit]

ο Piscium (Latinised to Omicron Piscium) is the system's Bayer designation. The designations of the two components as Omicron Piscium A and B derives from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[10]

The system bore the traditional name Torcularis septentrionalis, taken from the 1515 Almagest. The name is translated from the Greek ληνός ('full'), which was "erroneously written for λίνος" ('linen').[11] In 2016, the IAU organized a Working Group on Star Names (WGSN)[12] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[13] It approved the name Torcular for the component Omicron Piscium A on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[9]

In Chinese, 右更 (Yòu Gèng), meaning Official in Charge of the Pasturing, refers to an asterism consisting of Omicron Piscium, Eta Piscium, Rho Piscium, Pi Piscium and 104 Piscium. Consequently, the Chinese name for Omicron Piscium itself is 右更四 (Yòu Gèng sì, English: the Fourth Star of Official in Charge of the Pasturing.)[14]

Properties

[edit]

This is a probable astrometric binary system.[15] The visible component, Omicron Piscium A, is an evolved K-type giant star with a stellar classification of K0 III.[2] At the estimated age of 390 million years,[5] it is most likely (76% chance) on the horizontal branch, rather than the red-giant branch.[16] As such, it is a red clump star that is generating energy through helium fusion at its core.[3] The star has three times the mass of the Sun and has expanded to over 14 times the Sun's radius. It is radiating 132 times the Sun's luminosity from its photosphere at an effective temperature of 5,004 K.[5]

References

[edit]
  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d e Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1.
  3. ^ a b Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.
  4. ^ a b Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
  5. ^ a b c d Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.
  6. ^ Baines, Ellyn K.; Blomquist, Solvay; Clark III, James H.; Gorney, Jim; Maier, Erin; Sanborn, Jason; Schmitt, Henrique R.; Stone, Jordan M.; van Belle, Gerard T.; Braun, Kaspar von (2023-01-09). "Simultaneous Six-way Observations from the Navy Precision Optical Interferometer". The Astronomical Journal. 165 (2): 41. Bibcode:2023AJ....165...41B. doi:10.3847/1538-3881/aca277. ISSN 0004-6256.
  7. ^ "omi Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-25.
  8. ^ Richichi, A.; et al. (January 2016), "Lunar Occultations of 18 Stellar Sources from the 2.4 m Thai National Telescope", The Astronomical Journal, 151 (1): 5, Bibcode:2016AJ....151...10R, doi:10.3847/0004-6256/151/1/10, S2CID 119258140, 10.
  9. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  10. ^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
  11. ^ Allen, Richard Hinckley (1963), "Pisces, the Fishes", Star Names — Their Lore and Meaning, Dover
  12. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  13. ^ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Retrieved 2018-07-14.
  14. ^ "AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網" (in Chinese). 2006-05-19. Archived from the original on 2016-03-03. Retrieved 2012-08-30.
  15. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  16. ^ Reffert, Sabine; et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy and Astrophysics, 574A (2): 116–129, arXiv:1412.4634, Bibcode:2015A&A...574A.116R, doi:10.1051/0004-6361/201322360, S2CID 59334290.
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