Astronomy:Iota Hydrae: Difference between revisions

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  | source =  
  | source =  
  | mass = 1.92<ref name=Luck2015/>
  | mass = 1.92<ref name=Luck2015/>
  | radius = 33<ref name=Massarotti2008/>
  | radius = {{val|30|0.04}}<ref name=baines2018/>
  | luminosity = 83<ref name=Luck2015/>
  | luminosity = 83<ref name=Luck2015/>
  | temperature = {{Val|4244|32|fmt=commas}}<ref name=Luck2015/>
  | temperature = {{Val|4244|32|fmt=commas}}<ref name=Luck2015/>
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{{Starbox catalog
{{Starbox catalog
  | names = Ukdah, [[Astronomy:Bayer designation|ι Hya]], 35 Hydrae, [[Astronomy:Durchmusterung|BD]]−00° 2231, FK5 1250, HD 83618, HIP 47431, [[Astronomy:Bright Star Catalogue|HR]] 3845, [[Astronomy:Smithsonian Astrophysical Observatory Star Catalog|SAO]] 137035.<ref name=SIMBAD/>
  | names = Ukdah, [[Astronomy:Bayer designation|ι Hya]], 35 Hydrae, [[Astronomy:Durchmusterung|BD]]−00° 2231, FK5 1250, [[Astronomy:Henry Draper Catalogue|HD]] 83618, [[Astronomy:Hipparcos Catalogue|HIP]] 47431, [[Astronomy:Bright Star Catalogue|HR]] 3845, [[Astronomy:Smithsonian Astrophysical Observatory Star Catalog|SAO]] 137035.<ref name=SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
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{{starbox end}}
{{starbox end}}


'''Iota Hydrae''' ('''ι Hydrae''', abbreviated '''Iota Hya''', '''ι Hya'''), formally named '''Ukdah''' {{IPAc-en|'|V|k|d|@}},<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=18 June 2018}}</ref> is a [[Astronomy:Star|star]] in the [[Astronomy:Constellation|constellation]] of [[Astronomy:Hydra (constellation)|Hydra]], about 8° to the north-northwest of [[Astronomy:Alphard|Alphard]] (Alpha Hydrae)<ref name=OMeara2007/> and just to the south of the [[Celestial equator|celestial equator]].<ref name=Moore2013/> Visible to the naked eye, it is a suspected [[Astronomy:Variable star|variable star]] with an [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] that ranges between 3.87 and 3.91.<ref name=gcvs2009/> Based upon an annual [[Astronomy:Stellar parallax|parallax shift]] of 12.39&nbsp;mas measured during the [[Astronomy:Hipparcos|Hipparcos]] mission,<ref name=vanLeeuwen2007/> it is located around 263&nbsp;[[Astronomy:Light-year|light-year]]s from the [[Astronomy:Sun|Sun]].
'''Iota Hydrae''' ('''ι Hydrae''', abbreviated '''Iota Hya''', '''ι Hya'''), formally named '''Ukdah''' {{IPAc-en|'|V|k|d|@}},<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=18 June 2018}}</ref> is a [[Astronomy:Star|star]] in the [[Astronomy:Constellation|constellation]] of [[Astronomy:Hydra (constellation)|Hydra]], about 8° to the north-northwest of [[Astronomy:Alphard|Alphard]] (Alpha Hydrae)<ref name=OMeara2007/> and just to the south of the [[Celestial equator|celestial equator]].<ref name=Moore2013/> Visible to the naked eye, it is a suspected [[Astronomy:Variable star|variable star]] with an [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] that ranges between 3.87 and 3.91.<ref name=gcvs2009/> Based upon an annual [[Astronomy:Stellar parallax|parallax shift]] of 12.39&nbsp;[[Milliarcsecond|mas]] measured during the [[Astronomy:Hipparcos|Hipparcos]] mission,<ref name=vanLeeuwen2007/> it is located around 263&nbsp;[[Astronomy:Light-year|light-year]]s from the [[Astronomy:Sun|Sun]].


== Nomenclature ==
== Nomenclature ==
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This star along with [[Astronomy:Tau1 Hydrae|Tau¹ Hydrae]], [[Astronomy:Tau2 Hydrae|Tau² Hydrae]] and 33 Hydrae (A Hydrae), were Ptolemy's Καμπή (Kampē); but Kazwini knew them as عقدة ''ʽuqdah'' (or ''ʽuḳdah'') "knot".<ref>{{cite book | last=Allen | first=R. H. | year=1963 |  title=Star Names: Their Lore and Meaning | url=https://archive.org/details/starnamestheirlo00alle/page/250 | access-date=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York, NY | isbn=0-486-21079-0 | page=[https://archive.org/details/starnamestheirlo00alle/page/250 250] | url-access=registration }}</ref> According to a 1971 [[Organization:NASA|NASA]] memorandum,<ref>[https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf Jack W. Rhoads - ''Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars'', Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971]</ref> ''Ukdah'' was the name of an asterism of four stars: Tau¹ Hydrae as ''Uḳdah I'', Tau² Hydrae as ''Uḳdah II'', 33 Hydrae as ''Uḳdah III'' and Iota Hydrae as ''Uḳdah IV''. In 2016, the IAU organized a [[Astronomy: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 approved the name ''Ukdah'' for Iota Hydrae on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>
This star along with [[Astronomy:Tau1 Hydrae|Tau¹ Hydrae]], [[Astronomy:Tau2 Hydrae|Tau² Hydrae]] and 33 Hydrae (A Hydrae), were Ptolemy's Καμπή (Kampē); but Kazwini knew them as عقدة ''ʽuqdah'' (or ''ʽuḳdah'') "knot".<ref>{{cite book | last=Allen | first=R. H. | year=1963 |  title=Star Names: Their Lore and Meaning | url=https://archive.org/details/starnamestheirlo00alle/page/250 | access-date=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York, NY | isbn=0-486-21079-0 | page=[https://archive.org/details/starnamestheirlo00alle/page/250 250] | url-access=registration }}</ref> According to a 1971 [[Organization:NASA|NASA]] memorandum,<ref>[https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf Jack W. Rhoads - ''Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars'', Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971]</ref> ''Ukdah'' was the name of an asterism of four stars: Tau¹ Hydrae as ''Uḳdah I'', Tau² Hydrae as ''Uḳdah II'', 33 Hydrae as ''Uḳdah III'' and Iota Hydrae as ''Uḳdah IV''. In 2016, the IAU organized a [[Astronomy: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 approved the name ''Ukdah'' for Iota Hydrae on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>


In [[Social:Chinese language|Chinese]], {{lang|zh|星宿}} ({{lang|zh-Latn|Xīng Sù}}), meaning ''[[Astronomy:Star (Chinese constellation)|Star]] or asterism'', refers to an [[Astronomy:Asterism|asterism]] consisting of ι Hydrae, [[Astronomy:Alphard|Alphard]], [[Astronomy:Tau1 Hydrae|τ<sup>1</sup> Hydrae]], [[Astronomy:Tau2 Hydrae|τ<sup>2</sup> Hydrae]], [[Astronomy:26 Hydrae|26 Hydrae]], [[Astronomy:27 Hydrae|27 Hydrae]], HD 82477 and HD 82428.<ref>{{in lang|zh}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.</ref> Consequently, ι Hydrae are known as {{lang|zh|星宿四}} ({{lang|zh-Latn|Xīng Sù sì}}, {{lang-en|the Fourth Star of Star}}).<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060529.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 29 日]</ref>
In [[Social:Chinese language|Chinese]], {{lang|zh|星宿}} ({{lang|zh-Latn|Xīng Sù}}), meaning ''[[Astronomy:Star (Chinese constellation)|Star]] or asterism'', refers to an [[Astronomy:Asterism|asterism]] consisting of ι Hydrae, [[Astronomy:Alphard|Alphard]], [[Astronomy:Tau1 Hydrae|τ<sup>1</sup> Hydrae]], [[Astronomy:Tau2 Hydrae|τ<sup>2</sup> Hydrae]], [[Astronomy:26 Hydrae|26 Hydrae]], [[Astronomy:27 Hydrae|27 Hydrae]], HD 82477 and HD 82428.<ref>{{in lang|zh}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.</ref> Consequently, ι Hydrae are known as {{lang|zh|星宿四}} ({{lang|zh-Latn|Xīng Sù sì}}, {{langx|en|the Fourth Star of Star}}).<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060529.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 29 日] {{Webarchive|url=https://web.archive.org/web/20110522120541/http://aeea.nmns.edu.tw/2006/0605/ap060529.html |date=2011-05-22 }}</ref>


== Properties ==
== Properties ==


This is an [[Astronomy:Stellar evolution|evolved]] [[Astronomy:K-type star|K-type]] [[Astronomy:Giant star|giant star]] with a [[Astronomy:Stellar classification|stellar classification]] of K2.5&nbsp;III.<ref name=Luck2015/> It is a [[Astronomy:Barium star|Barium star]], which means that, for a giant star, it displays unusually strong absorption lines of [[Physics:Ionization|singly-ionized]] [[Chemistry:Barium|barium]] and [[Chemistry:Strontium|strontium]].<ref name=Lu1991/> Iota Hydrae has nearly twice<ref name=Luck2015/> the [[Astronomy:Solar mass|mass of the Sun]] and has expanded to 33 times the [[Astronomy:Solar radius|Sun's radius]].<ref name=Massarotti2008/> It is around 2.5 billion years old and is spinning with a leisurely projected rotational velocity of 4.5<ref name=Massarotti2008/>&nbsp;km/s. It may be a member of the Wolf 630 [[Astronomy:Moving group|moving group]] of stars that share a common trajectory through space.<ref name=McDonald1983/>
This is an [[Astronomy:Stellar evolution|evolved]] [[Astronomy:K-type star|K-type]] [[Astronomy:Giant star|giant star]] with a [[Astronomy:Stellar classification|stellar classification]] of K2.5&nbsp;III.<ref name=Luck2015/> It is a [[Astronomy:Barium star|Barium star]], which means that, for a giant star, it displays unusually strong absorption lines of [[Physics:Ionization|singly-ionized]] [[Chemistry:Barium|barium]] and [[Chemistry:Strontium|strontium]].<ref name=Lu1991/> Iota Hydrae has nearly twice<ref name=Luck2015/> the [[Astronomy:Solar mass|mass of the Sun]] and has expanded to 30 times the [[Astronomy:Solar radius|Sun's radius]].<ref name=baines2018/> It is around 2.5 billion years old and is spinning with a leisurely [[Projected rotational velocity|projected rotational velocity]] of 4.5<ref name=Massarotti2008/>&nbsp;km/s. It may be a member of the Wolf 630 [[Astronomy:Moving group|moving group]] of stars that share a common trajectory through space.<ref name=McDonald1983/>


==References==
==References==
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  | title=Herschel 400 Observing Guide
  | title=Herschel 400 Observing Guide
  | first1=Steve | last1=O'Meara
  | first1=Steve | last1=O'Meara
  | publisher={{wipe|Cambridge University Press}}
  | publisher=Cambridge University Press
  | year=2007 | isbn=978-0521858939 | page=84
  | year=2007 | isbn=978-0521858939 | page=84
  | url=https://books.google.com/books?id=Nyh9fAC_tpIC&pg=PA84
  | url=https://books.google.com/books?id=Nyh9fAC_tpIC&pg=PA84
  | postscript=. }}</ref>
  | postscript=. }}</ref>
<ref name=baines2018>{{citation |bibcode=2018AJ....155...30B |title=Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer |last1=Baines |first1=Ellyn K. |last2=Armstrong |first2=J. Thomas |last3=Schmitt |first3=Henrique R. |last4=Zavala |first4=R. T. |last5=Benson |first5=James A. |last6=Hutter |first6=Donald J. |last7=Tycner |first7=Christopher |last8=Van Belle |first8=Gerard T. |journal=The Astronomical Journal |year=2018 |volume=155 |issue=1 |pages=30 |doi=10.3847/1538-3881/aa9d8b |arxiv=1712.08109 |s2cid=119427037 |postscript=. |doi-access=free }}</ref>


<ref name=Moore2013>{{citation
<ref name=Moore2013>{{citation
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[[Category:Hydra (constellation)]]
[[Category:Hydra (constellation)]]
[[Category:Bayer objects|Hydrae, Iota]]
[[Category:Bayer objects|Hydrae, Iota]]
[[Category:Durchmusterung objects]]
[[Category:Durchmusterung objects|BD-00 2231]]
[[Category:Flamsteed objects|Hydrae, 35]]
[[Category:Flamsteed objects|Hydrae, 35]]
[[Category:Henry Draper Catalogue objects|083618]]
[[Category:Henry Draper Catalogue objects|083618]]
[[Category:Hipparcos objects|047431]]
[[Category:Hipparcos objects|047431]]
[[Category:Bright Star Catalogue objects|3845]]
[[Category:Bright Star Catalogue objects|3845]]
[[Category:Stars with proper names|Uḳdah IV]]
[[Category:Stars with proper names|Ukdah]]


{{Sourceattribution|Iota Hydrae}}
{{Sourceattribution|Iota Hydrae}}

Latest revision as of 23:18, 14 May 2025

Short description: Star in the constellation Hydra
Iota Hydrae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hydra
Right ascension  09h 39m 51.36145s[1]
Declination −01° 08′ 34.1135″[1]
Apparent magnitude (V) 3.91[2]
Characteristics
Spectral type K2.5 III[2]
B−V color index 1.32
Variable type Suspected[3]
Astrometry
Radial velocity (Rv)+24.19±0.36[4] km/s
Proper motion (μ) RA: +46.96[1] mas/yr
Dec.: −62.39[1] mas/yr
Parallax (π)12.39 ± 0.14[1] mas
Distance263 ± 3 ly
(80.7 ± 0.9 pc)
Absolute magnitude (MV)−0.63[5]
Details
Mass1.92[2] M☉
Radius30±0.04[6] R☉
Luminosity83[2] L☉
Surface gravity (log g)2.2[4] cgs
Temperature4,244±32[2] K
Metallicity [Fe/H]−0.05[2] dex
Rotational velocity (v sin i)4.5[4] km/s
Age2.47[2] Gyr
Other designations
Ukdah, ι Hya, 35 Hydrae, BD−00° 2231, FK5 1250, HD 83618, HIP 47431, HR 3845, SAO 137035.[7]
Database references
SIMBADdata

Iota Hydrae (ι Hydrae, abbreviated Iota Hya, ι Hya), formally named Ukdah /ˈʌkdə/,[8] is a star in the constellation of Hydra, about 8° to the north-northwest of Alphard (Alpha Hydrae)[9] and just to the south of the celestial equator.[10] Visible to the naked eye, it is a suspected variable star with an apparent visual magnitude that ranges between 3.87 and 3.91.[3] Based upon an annual parallax shift of 12.39 mas measured during the Hipparcos mission,[1] it is located around 263 light-years from the Sun.

Nomenclature

ι Hydrae (Latinised to Iota Hydrae) is the star's Bayer designation.

This star along with Tau¹ Hydrae, Tau² Hydrae and 33 Hydrae (A Hydrae), were Ptolemy's Καμπή (Kampē); but Kazwini knew them as عقدة ʽuqdah (or ʽuḳdah) "knot".[11] According to a 1971 NASA memorandum,[12] Ukdah was the name of an asterism of four stars: Tau¹ Hydrae as Uḳdah I, Tau² Hydrae as Uḳdah II, 33 Hydrae as Uḳdah III and Iota Hydrae as Uḳdah IV. In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the name Ukdah for Iota Hydrae on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[8]

In Chinese, 星宿 (Xīng Sù), meaning Star or asterism, refers to an asterism consisting of ι Hydrae, Alphard, τ1 Hydrae, τ2 Hydrae, 26 Hydrae, 27 Hydrae, HD 82477 and HD 82428.[14] Consequently, ι Hydrae are known as 星宿四 (Xīng Sù sì, English: the Fourth Star of Star).[15]

Properties

This is an evolved K-type giant star with a stellar classification of K2.5 III.[2] It is a Barium star, which means that, for a giant star, it displays unusually strong absorption lines of singly-ionized barium and strontium.[16] Iota Hydrae has nearly twice[2] the mass of the Sun and has expanded to 30 times the Sun's radius.[6] It is around 2.5 billion years old and is spinning with a leisurely projected rotational velocity of 4.5[4] km/s. It may be a member of the Wolf 630 moving group of stars that share a common trajectory through space.[17]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 23, doi:10.1088/0004-6256/150/3/88, 88, Bibcode: 2015AJ....150...88L. 
  3. ↑ 3.0 3.1 Samus, N. N. et al. (2009), "General Catalogue of Variable Stars", VizieR On-line Data Catalog 1, Bibcode: 2009yCat....102025S. 
  4. ↑ 4.0 4.1 4.2 4.3 Massarotti, Alessandro et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  5. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 Baines, Ellyn K.; Armstrong, J. Thomas; Schmitt, Henrique R.; Zavala, R. T.; Benson, James A.; Hutter, Donald J.; Tycner, Christopher; Van Belle, Gerard T. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B. 
  7. ↑ "iot Hya". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=iot+Hya. 
  8. ↑ 8.0 8.1 "Naming Stars". IAU.org. https://www.iau.org/public/themes/naming_stars/. 
  9. ↑ O'Meara, Steve (2007), Herschel 400 Observing Guide, Cambridge University Press, p. 84, ISBN 978-0521858939, https://books.google.com/books?id=Nyh9fAC_tpIC&pg=PA84. 
  10. ↑ Moore, Patrick (2013), The Observer's Year: 366 Nights of the Universe, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 71, ISBN 978-1447136132, https://books.google.com/books?id=p87TBwAAQBAJ&pg=PA71-IA11. 
  11. ↑ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 250. ISBN 0-486-21079-0. https://archive.org/details/starnamestheirlo00alle/page/250. Retrieved 2010-12-12. 
  12. ↑ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
  13. ↑ "IAU Working Group on Star Names (WGSN)". https://www.iau.org/science/scientific_bodies/working_groups/280/. 
  14. ↑ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN:978-986-7332-25-7.
  15. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 29 日
  16. ↑ Lu, Phillip K. (June 1991), "Taxonomy of barium stars", Astronomical Journal 101: 2229–2254, doi:10.1086/115845, Bibcode: 1991AJ....101.2229L. 
  17. ↑ McDonald, A. R. E.; Hearnshaw, J. B. (August 1983), "The Wolf 630 moving group of stars", Monthly Notices of the Royal Astronomical Society 204 (3): 841–852, doi:10.1093/mnras/204.3.841, Bibcode: 1983MNRAS.204..841M. 



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