{{short description|Star in the constellation Capricornus}} {{redirect|Nashira|the ship|Nashira (AK-85)}} {{Starbox begin | name=γ Capricorni }} {{Starbox image | image = {{Location mark | image=Capricornus constellation map.png | float=center | width=240 | position=right | mark=Red circle.svg | mark_width=10 | mark_link=γ Cap | x%=19.9 | y%=53.5 }} | caption = Location of γ Capricorni (circled) }} {{Starbox observe | epoch=J2000 | constell=Capricornus | ra={{RA|21|40|05.445}}<ref name=GaiaDR3>{{cite DR3|6838023243053666688}}</ref> | dec={{DEC|−16|39|44.54}}<ref name=GaiaDR3/> | appmag_v=+3.67<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R.|year=2002}}</ref> }} {{Starbox character | class= kF0hF1VmF2<ref name=abt>{{cite journal|bibcode=1995ApJS...99..135A|title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars|journal=Astrophysical Journal Supplement |volume=99|pages=135|last1=Abt|first1=Helmut A.|last2=Morrell|first2=Nidia I.|year=1995|doi=10.1086/192182|doi-access=free}}</ref> | b-v=+0.32<ref name="clpl4">{{cite journal | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell, R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 |pages=99 | date=1966 | bibcode=1966CoLPL...4...99J | display-authors=1 }}</ref> | u-b=+0.22<ref name="clpl4" /> | variable=α<sup>2</sup> CVn<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|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref> }} {{Starbox astrometry | radial_v={{val|−31.2|0.5}}<ref name=Gontcharov2006>{{cite journal | last1=Gontcharov | first1=G. A. | title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system | journal=Astronomy Letters | volume=32| issue=11| pages=759–771| date=November 2006 | doi=10.1134/S1063773706110065 | s2cid=119231169 | bibcode=2006AstL...32..759G | arxiv=1606.08053 }}</ref> | prop_mo_ra=+200.193 | prop_mo_dec=−9.578 | pm_footnote=<ref name=GaiaDR3/> | parallax=19.1037 | p_error=0.6765 | parallax_footnote=<ref name=GaiaDR3/> | absmag_v=+2.60<ref name=Eggen1998>{{citation | title=The Age Range of Hyades Stars | last1=Eggen | first1=Olin J. | postscript=. | journal=The Astronomical Journal | volume=116 | issue=1 | pages=284–292 | date=July 1998 | doi=10.1086/300413 | bibcode=1998AJ....116..284E | doi-access=free }}</ref> }} {{Starbox detail | age= | metal_fe=+0.5<ref name="aaa249" /> | mass=2.44<ref name=Glagolevskij2019>{{cite journal | title=On Properties of Main Sequence Magnetic Stars | last=Glagolevskij | first=Yu. V. | journal=Astrophysical Bulletin | volume=74 | issue=1 | pages=66–79 | date=January 2019 | doi=10.1134/S1990341319010073 | bibcode=2019AstBu..74...66G | s2cid=149900274 }}</ref> | radius=2.35<ref name=Glagolevskij2019/> | rotational_velocity=40<ref>{{cite journal | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | journal=Astronomy and Astrophysics | volume=393 | issue=3 | pages=897–911 | date=October 2002 | doi=10.1051/0004-6361:20020943 | s2cid=14070763 | bibcode=2002A&A...393..897R | arxiv=astro-ph/0205255 }}</ref> | luminosity=33<ref name=tic>{{cite journal |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Paegert |first3=Martin |last4=Torres |first4=Guillermo |last5=Pepper |first5=Joshua |last6=De Lee |first6=Nathan |last7=Collins |first7=Kevin |last8=Latham |first8=David W. |last9=Muirhead |first9=Philip S. |last10=Chittidi |first10=Jay |last11=Rojas-Ayala |first11=Bárbara |last12=Fleming |first12=Scott W. |last13=Rose |first13=Mark E. |last14=Tenenbaum |first14=Peter |last15=Ting |first15=Eric B. |last16=Kane |first16=Stephen R. |last17=Barclay |first17=Thomas |last18=Bean |first18=Jacob L. |last19=Brassuer |first19=C. E. |last20=Charbonneau |first20=David |last21=Ge |first21=Jian |last22=Lissauer |first22=Jack J. |last23=Mann |first23=Andrew W. |last24=McLean |first24=Brian |last25=Mullally |first25=Susan |last26=Narita |first26=Norio |last27=Plavchan |first27=Peter |last28=Ricker |first28=George R. |last29=Sasselov |first29=Dimitar |last30=Seager |first30=S. |display-authors=1 |title=The Revised TESS Input Catalog and Candidate Target List |journal=The Astronomical Journal |date=2019 |volume=158 |issue=4 |page=138 |doi=10.3847/1538-3881/ab3467 |doi-access=free |arxiv=1905.10694 |bibcode=2019AJ....158..138S }}</ref> | temperature=7,520<ref name="aaa249">{{cite journal |author1=Burkhart, C. |author2=Coupry, M. F. | title=The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe | journal=Astronomy and Astrophysics | volume=249 | issue=1 |date=September 1991 | pages=205–216 | bibcode=1991A&A...249..205B }}</ref> | gravity=3.69<ref name=Glagolevskij2019/> | age_gyr=1.0<ref name=Glagolevskij2019/> }} {{Starbox catalog | names = {{odlist | name=Nashira | B=Gamma Cap, Gam Cap, γ Cap | F=40&nbsp;Capricorni | HR=8278 | HD=206088 | GJ=4209 | BD=−17°6340 | FK5=812 | HIP=106985 | SAO=164560 }}<ref name=SIMBAD>{{cite simbad | title=gam Cap | access-date=2021-06-20 }}</ref> }} {{Starbox reference | Simbad = Gamma+Cap }} {{Starbox end}}

'''Gamma Capricorni''' is a star in the constellation of Capricornus. It has the proper name '''Nashira''', pronounced ({{IPAc-en|'|n|æ|S|ɪ|r|@}});<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars | publisher=IAU.org | access-date=7 March 2018 | archive-date=10 March 2025 | archive-url=https://web.archive.org/web/20250310063743/https://www.iau.org/public/themes/naming_stars/ | url-status=dead }}</ref> ''Gamma Capricorni'' is its Bayer designation. Based on parallax measurements, it is located at a distance of approximately {{convert|171|ly|pc|abbr=out|lk=on}} from the Sun. The star is drifting closer with a radial velocity of −31&nbsp;km/s.<ref name=Gontcharov2006/> It is 2.56 degrees south of the ecliptic, so it can be occulted by the Moon, and (rarely) by planets.

==Nomenclature== ''γ Capricorni'' (Latinised to ''Gamma Capricorni'') is the star's Bayer designation.

It bore the traditional name ''Nashira'', derived from the Arabic سعد ناشرة ''sa'd nashirah'' "the lucky one" or "bearer of good news". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)<ref name="WGSN">{{citation | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN) | publisher=International Astronomical Union | access-date=22 May 2016 | postscript=. | archive-date=10 June 2016 | archive-url=https://web.archive.org/web/20160610172014/https://www.iau.org/science/scientific_bodies/working_groups/280/ | url-status=dead }}</ref> to catalogue and standardize proper names for stars. The WGSN approved the name ''Nashira'' for this star on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>

In Chinese, {{lang|zh|壘壁陣}} ({{lang|zh-Latn|Lěi Bì Zhèn}}), meaning ''Line of Ramparts'', refers to an asterism consisting of Gamma Capricorni, Kappa Capricorni, Epsilon Capricorni, Delta Capricorni, Iota Aquarii, Sigma Aquarii, Lambda Aquarii, Phi Aquarii, 27 Piscium, 29 Piscium, 33 Piscium and 30 Piscium.<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, the Chinese name for Gamma Capricorni itself is {{lang|zh|壘壁陣三}} ({{lang|zh-Latn|Lěi Bì Zhèn sān}}, {{langx|en|the Third Star of Line of Ramparts}}).<ref>{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_n_r.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive |url=https://web.archive.org/web/20110130063024/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_n_r.htm |date=January 30, 2011 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref>

===Namesake=== Nashira (AK-85) was a United States Navy ship, though it was never commissioned and never bore the USS designation.<ref>{{cite web|url=http://www.history.navy.mil/faqs/faq63-1.htm |title=Ship Naming in the United States Navy |url-status=dead |archive-url=https://web.archive.org/web/20150103224426/http://www.history.navy.mil/faqs/faq63-1.htm |archive-date=3 January 2015 |work=Naval History & Heritage Command }}</ref><ref>{{cite web |url=http://www.navsource.net/archives/09/13/130085.htm |title=NavSource Online: Service Ship Photo Archive: AK-85 Nashira |website=NavSource |access-date=28 December 2016}}</ref>

==Properties==

γ Capricorni is classified as a hot chemically peculiar Am star with a mean apparent magnitude of +3.67. The spectrum displays abundance anomalies of the elements strontium, chromium, and europium.<ref name=Glagolevskij2019/> It was first classified as an Am star in 1965 by K. Osawa, but in 1974 C. Bertaud and M. Floquet found it to be an Ap star with a strontium abundance anomaly. In 1998, F. A. Catalano and associates found a slight variability in the infrared J band with a period of 2.78 days, which suggests the Ap classification is correct. However, no magnetic field is detected, which points to the Am classification, as does the infrared spectrum.

The star displays large radial velocity variations, which could be explained by star spots and rotation. Alternatively it may be a double-lined spectroscopic binary viewed from nearly pole-on.<ref name=Carrier2002>{{cite journal | title=Multiplicity among chemically peculiar stars. II. Cool magnetic Ap stars | last1=Carrier | first1=F. | last2=North | first2=P. | last3=Udry | first3=S. | last4=Babel | first4=J. | display-authors=1 | journal=Astronomy and Astrophysics | volume=394 | pages=151–169 | date=October 2002 | doi=10.1051/0004-6361:20021122 | arxiv=astro-ph/0208082 | bibcode=2002A&A...394..151C | s2cid=14223227 }}</ref> This star is classified as an α<sup>2</sup> Canum Venaticorum type variable star and its brightness varies by 0.03 magnitudes.<ref name=gcvs/> It has 2.44 times the mass and 2.35 times the radius of the Sun.<ref name=Glagolevskij2019/> O. J. Eggen included it as a member of the Hyades Stream.<ref name=Eggen1998/>

==References== {{Reflist}}

==External links== *{{cite web | title=Nashira | work=STARS | first=James B. | last=Kaler | author-link=James B. Kaler | url=http://stars.astro.illinois.edu/sow/nashira.html | access-date=2021-06-21 }}

{{Stars of Capricornus}} {{Sky|21|40|05.5|-|16|39|44|139}}

<!-- Properties --> Category:F-type main-sequence stars Category:Am stars Category:Alpha2 Canum Venaticorum variables Category:Hyades Stream <!-- Other --> Category:Capricornus Capricorni, Gamma 8278 Category:Durchmusterung objects Capricorni, 40 206088 106985 Nashira Category:Population I stars