View source for Astronomy:Nu Ceti

{{Short description|Binary star system in the constellation Cetus}}
{{Starbox begin}}
{{Starbox image
 | image    =
{{Location mark
|image=Cetus constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=ν Cet
|x=250|y=172
}}
 | caption  = Location of ν Ceti (circled)
}}
{{Starbox observe 
 | epoch    = J2000.0
 | constell = [[Astronomy:Cetus|Cetus]]
 | ra       = {{RA|02|35|52.473}}<ref name="van Leeuwen2007"/>
 | dec      = {{DEC|+05|35|35.69}}<ref name="van Leeuwen2007"/>
 | appmag_v = 4.86<ref name="Cousins1963"/> + 9.08<ref name="Lutz1977"/> (visual companion)
}}
{{Starbox character
 | class    = G8III + F7V (visual companion)<ref name="Stephenson1969"/>
 | b-v      = 0.88<ref name="Cousins1963"/>
 | u-b      = 0.52<ref name="Cousins1963"/>
}}
{{Starbox astrometry 
 | radial_v = {{val|4.81|0.02}}<ref name="Griffin2015"/>
 | prop_mo_ra  = {{val|−26.51|0.25}}<ref name="van Leeuwen2007"/>
 | prop_mo_dec = {{val|−22.32|0.22}}<ref name="van Leeuwen2007"/>
 | parallax = 9.59
 | p_error  = 0.23
 | parallax_footnote = <ref name="van Leeuwen2007"/>
 | absmag_v = −0.415<ref name=data/>
}}
{{Starbox orbit
 | reference = <ref name="Griffin2015"/>
 | primary  = ν Ceti A
 | name     =
 | period_unitless = {{val|714.48|0.15}} days
 | eccentricity = {{val|0.274|0.005}}
 | node     = 
 | periastron = {{val|53364.9|1.9}}
 | periarg  = {{val|119.5|1.1}}
 | k1       = {{val|5.09|0.03}}
}}
{{Starbox detail 
 | component1 = Aa
 | mass     = 2.65<ref name=Stock2018/>
 | radius   = {{Val|15.87|1.06|2.19}}<ref name=GaiaDR2/>
 | metal_fe = 
 | gravity  = 2.56<ref name=Stock2018/>
 | age_myr  = 537<ref name=Stock2018/>
 | temperature = {{Val|5164|417|164|fmt=commas}}<ref name=GaiaDR2/>
 | luminosity = {{Val|161.4|7.9}}<ref name=GaiaDR2/>
 | rotational_velocity = 
}}
{{Starbox catalog
 | names = {{odlist | name=Struve 281 | F=78&nbsp;Ceti | BD=+04°418 | HD=16161 | HIP=12093 | HR=754 | SAO=110635 | WDS=J02359+0536 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad = nu.+Cet
}}
{{Starbox end}}

'''ν Ceti''', [[Social:Romanization of Greek|Latinized]] as '''Nu Ceti''', is a [[Astronomy:Binary star|binary star]]<ref name="Griffin2015"/> system in the [[Celestial equator|equatorial]] [[Astronomy:Constellation|constellation]] of [[Astronomy:Cetus|Cetus]]. It is visible to the naked eye as a faint point of light with a combined [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] of 4.86.<ref name="Cousins1963"/> The system is located approximately 340&nbsp;[[Light year|light year]]s distant from the Sun, based on [[Astronomy:Stellar parallax|parallax]], and is drifting further away with a [[Astronomy:Radial velocity|radial velocity]] of 4.8&nbsp;km/s.<ref name="Griffin2015"/> Nu Ceti is believed to be part of the [[Astronomy:Ursa Major Moving Group|Ursa Major stream]] of co-moving stars.<ref name=Levato1978/>

In [[Astronomy:Chinese astronomy|Chinese]], {{lang|zh|天囷}} ({{lang|zh-Latn|Tiān Qūn}}), meaning ''[[Astronomy:Stomach (Chinese constellation)|Circular Celestial Granary]]'', refers to an asterism consisting of [[Astronomy:Alpha Ceti|α Ceti]], [[Astronomy:Kappa1 Ceti|κ<sup>1</sup> Ceti]], [[Astronomy:Lambda Ceti|λ Ceti]], [[Astronomy:Mu Ceti|μ Ceti]], [[Astronomy:Xi1 Ceti|ξ<sup>1</sup> Ceti]], [[Astronomy:Xi2 Ceti|ξ<sup>2</sup> Ceti]], ν Ceti, [[Astronomy:Gamma Ceti|γ Ceti]], [[Astronomy:Delta Ceti|δ Ceti]], [[Astronomy:75 Ceti|75 Ceti]], 70 Ceti, [[Astronomy:63 Ceti|63 Ceti]] and 66 Ceti. Consequently, the [[Astronomy:Chinese star names|Chinese name]] for ν Ceti itself is "the Seventh Star of Circular Celestial Granary", {{lang|zh-Latn|Tiān Qūn Qī}}.<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060711.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日]</ref>

The primary, designated component A, forms a single-lined [[Astronomy:Spectroscopic binary|spectroscopic binary]] with an [[Astronomy:Orbital period|orbital period]] of {{Convert|714.5|days|years|2|abbr=off|disp=out}} and an [[Astronomy:Orbital eccentricity|eccentricity]] of 0.27.<ref name="Griffin2015"/> The visible component is a G-type [[Astronomy:Giant star|giant star]], currently on the [[Astronomy:Horizontal branch|horizontal branch]],<ref name=Stock2018/> with a [[Astronomy:Stellar classification|stellar classification]] of G8III.<ref name="Stephenson1969"/> In addition to the spectroscopic companion there is a visual companion star which shares a common proper motion with Nu Ceti A, designated component B; an [[Astronomy:F-type main-sequence star|F-type main-sequence star]] with a class of F7V<ref name="Stephenson1969"/> and a 9.08 apparent visual magnitude located 8.0 arcsec away. It was discovered by Struve.<ref name="Griffin2015"/><ref name="Lutz1977"/>

== References ==
{{Reflist|refs=

<ref name=SIMBAD>{{cite simbad | title=nu. Cet | access-date=2019-09-27}}</ref>

<ref name=GaiaDR2>{{cite DR2|18118925129052544}}</ref>

<ref name=Stock2018>{{citation
 | title=Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search
 | display-authors=1 | last1=Stock | first1=Stephan
 | last2=Reffert | first2=Sabine | last3=Quirrenbach | first3=Andreas
 | journal=Astronomy & Astrophysics
 | volume=616 | id=A33 | pages=15 | date=August 2018
 | doi=10.1051/0004-6361/201833111 | arxiv=1805.04094
 | bibcode=2018A&A...616A..33S | s2cid=119361866 | postscript=. }}</ref>

<ref name=Levato1978>{{citation | postscript=.
 | title=Spectral types in the Ursa Major stream
 | last1=Levato | first1=H. | last2=Abt | first2=H. A.
 | journal=Publications of the Astronomical Society of the Pacific
 | volume=90 | pages=429−433 | date=August 1978
 | doi=10.1086/130352 | bibcode=1978PASP...90..429L | doi-access=free }}</ref>

<ref name="Cousins1963">{{cite journal | title=Photometric Data for Stars in the Equatorial Zone (Third List) | url=http://articles.adsabs.harvard.edu/full/1963MNSSA..22...12C | last1=Cousins | first1=A. W. J. | journal=Monthly Notes of the Astronomical Society of Southern Africa | volume=22 | pages=12–17 | year=1963 | bibcode=1963MNSSA..22...12C }}</ref>

<ref name="Griffin2015">{{cite journal | title=Spectroscopic binary orbits from photoelectric radial velocities. Paper 240: BD+59 224, HD 9592, HD 10171, HD 11738, and nu Ceti | url=http://articles.adsabs.harvard.edu/full/2015Obs...135...15G | last1=Griffin | first1=R. F. | journal=The Observatory | volume=135 | pages=15–41 | year=2015 | bibcode=2015Obs...135...15G }}</ref>

<ref name="Lutz1977">{{cite journal | title=Spectral classification and UBV photometry of bright visual double stars | url=http://articles.adsabs.harvard.edu/full/1977AJ.....82..431L | last1=Lutz | first1=T. E. | last2=Lutz | first2=J. H.| journal=The Astronomical Journal | volume=82 | pages=431–434 | year=1977 | bibcode=1977AJ.....82..431L | doi=10.1086/112066 | doi-access=free }}</ref>

<ref name="Stephenson1969">{{cite journal | title=The masses of stars above the main sequence | url=http://articles.adsabs.harvard.edu/full/1969AJ.....74..689S| last1=Stephenson | first1=C. B. | last2=Sanwal | first2=N. B. | journal=The Astronomical Journal | volume=74 | pages=689–704 | year=1969 | bibcode=1969AJ.....74..689S | doi=10.1086/110845 | doi-access=free }}</ref>

<ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=12062 Vizier catalog entry ]</ref>

<ref name=data>{{cite web|url=http://www.astrostudio.org/xhip.php?hip=12093|archive-url=https://archive.today/20130226014019/http://www.astrostudio.org/xhip.php?hip=12093|url-status=dead|archive-date=2013-02-26|title=Nu Ceti}}</ref>

}}

==External links==
*http://server3.wikisky.org/starview?object_type=1&object_id=1566
*http://www.alcyone.de/SIT/bsc/HR0754.html

{{Stars of Cetus}}
<!-- Properties -->
{{DEFAULTSORT:Nu Ceti}}
[[Category:F-type main-sequence stars]]
[[Category:G-type giants|Cetus, Nu]]
[[Category:Horizontal-branch stars]]
[[Category:Spectroscopic binaries]]
<!-- Identifiers -->
[[Category:Bayer objects|Cetus, Nu]]
[[Category:Durchmusterung objects]]
[[Category:Flamsteed objects|Ceti, 78]]
[[Category:Henry Draper Catalogue objects|016161]]
[[Category:Hipparcos objects|012093]]
[[Category:Bright Star Catalogue objects|0754]]

{{Sourceattribution|Nu Ceti}}