# Iota Apodis

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> Markdown URL: https://mediated.wiki/source/Iota_Apodis.md
> Source: https://en.wikipedia.org/wiki/Iota_Apodis
> Source revision: 1336431078
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Star in the constellation Apus}}
{{Starbox begin
 | name = ι Apodis
}}
{{Starbox image
 | image=
{{Location mark
|image=Apus constellation map.svg|alt=|float=center|width=240
|label=|position=right
|mark=Red circle.svg|mark_width=8|mark_link=ι Apodis
|x=244|y=364
}}
|caption=Location of ι Apodis (circled)
}}
{{Starbox observe
 | epoch       = J2000
 | ra          = {{RA|17|22|05.876}}<ref name=dr3/>
 | dec         = {{DEC|-70|07|23.54}}<ref name=dr3/>
 | appmag_v    = 5.41<ref name=aass34_1/> (5.90/6.46)<ref name=mnras389_2_869/>
 | constell    = [Apus](/source/Apus)
}}
{{Starbox character
 | class       = {{nowrap|B9 V + B9.5 V}}<ref name=mnras389_2_869/>
 | b-v         = −0.04<ref name=aass34_1/>
 | u-b         = −0.23<ref name=aass34_1/>
 | variable    = 
}}
{{Starbox astrometry
 | radial_v    = −4.3<ref name=gcsrv/>
 | prop_mo_ra  = −1.881
 | prop_mo_dec = −11.363
 | pm_footnote = <ref name=dr3/>
 | parallax    = 3.1948 
 | p_error     = 0.1853
 | parallax_footnote = <ref name=dr3/>
 | absmag_v    = 
}}
{{Starbox orbit
 | reference = <ref name=Docobo2013/>
 | period = {{Val|59.32|3.0}}
 | axis = {{Val|0.115|0.005}}
 | eccentricity = {{Val|0.172|0.050}}
 | inclination = {{Val|69.4|3.0}}
 | node = {{Val|119.6|4.0}}
 | periastron = <!--Periastron epoch-->
 | periarg = {{Val|270.5|7.0}}
}}
{{Starbox detail
 | component1  = ι Aps A
 | mass        = {{Val|3.89|1.02}}<ref name=Docobo2013/>
 | radius      = 
 | luminosity  = 
 | temperature = 
 | metal_fe    = 
 | rotational_velocity = 
 | age_myr     = 
 | component2  = ι Aps B
 | mass2       = {{Val|3.45|0.90}}<ref name=Docobo2013/>
}}
{{Starbox catalog
 | names={{odlist | B=ι Apodis, Iot Aps, ι Aps | FK5=642 | HD=156190 | HIP=84979 | HR=6411 | SAO=257491 | WDS=J17221−7007 | CPD=−69 2719 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad = iot+Aps
}}
{{Starbox end}}

'''Iota Apodis'''  is a [binary star](/source/binary_star)<ref name=mnras389_2_869/> system in the southern [circumpolar constellation](/source/circumpolar_constellation) of [Apus](/source/Apus). Its identifier is a [Bayer designation](/source/Bayer_designation) that is [Latinized](/source/Romanization_of_Greek) from ι Apodis, and abbreviated Iot Aps or ι Aps, respectively. This system is a faint target at an [apparent visual magnitude](/source/apparent_visual_magnitude) of 5.41,<ref name=aass34_1/> but still visible to the naked eye from [suitably dark skies](/source/Bortle_Dark-Sky_Scale). The distance to this star can be gauged from [parallax](/source/stellar_parallax) measurements, yielding an estimate of {{Convert|1,020|ly|pc|abbr=off|lk=on}} with a 6% [margin of error](/source/margin_of_error).<ref name=dr3/> The system is drifting closer with a heliocentric [radial velocity](/source/radial_velocity) of −4.3&nbsp;km/s.<ref name=gcsrv/>

The dual nature of this system was announced by [W. S. Finsen](/source/William_Stephen_Finsen) in 1960, who reported an [angular separation](/source/angular_separation) of {{val|0.104|ul=arcseconds}}.<ref name=Finsen_1960/> Their orbit has an [angular separation](/source/angular_separation) of 0.091&nbsp;[arcsecond](/source/arcsecond)s<ref name=mnras389_2_869/> with an estimated [orbital period](/source/orbital_period) of 59.32&nbsp;years and an [eccentricity](/source/orbital_eccentricity) (ovalness) of 0.17.<ref name=Docobo2013/> Both stars are [B-type main sequence star](/source/B-type_main_sequence_star)s, which indicates they shine with a blue-white hue.<ref name=csiro/> The brighter component has a stellar classification of B9&nbsp;V and an apparent magnitude 5.90, while the second member is a B9.5&nbsp;V star with a magnitude of 6.46. They are about 3.89 and 3.45 times as massive as the Sun, respectively.<ref name=Docobo2013/>

==Naming==
In [Chinese](/source/Chinese_language) caused by adaptation of the European southern hemisphere constellations into the Chinese system, {{lang|zh|異雀}} ({{lang|zh-Latn|Yì Què}}), meaning ''[Exotic Bird](/source/Chinese_constellations)'', refers to an asterism consisting of ι Apodis, [ζ Apodis](/source/Zeta_Apodis), [β Apodis](/source/Beta_Apodis), [γ Apodis](/source/Gamma_Apodis), [δ Octantis](/source/Delta_Octantis), [δ<sup>1</sup> Apodis](/source/Delta_Apodis), [η Apodis](/source/Eta_Apodis), [α Apodis](/source/Alpha_Apodis) and [ε Apodis](/source/Epsilon_Apodis). Consequently, ι Apodis itself is known as {{lang|zh|異雀二}} ({{lang|zh-Latn|Yì Què èr}}, {{langx|en|the Second Star of Exotic Bird}}.)<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060729.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日] {{Webarchive|url=https://web.archive.org/web/20110522124325/http://aeea.nmns.edu.tw/2006/0607/ap060729.html |date=2011-05-22 }}</ref>

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

<ref name=dr3>{{cite Gaia DR3|5810861541976948096}}</ref>

<ref name=Docobo2013>{{citation
 | title=Dynamical and physical properties of 22 binaries discovered by W. S. Finsen
 | last1=Docobo | first1=J. A. | last2=Andrade | first2=M.
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=428 | issue=1 | pages=321–339 | date=January 2013
 | doi=10.1093/mnras/sts045 | bibcode=2013MNRAS.428..321D
 | postscript=. | doi-access=free }}</ref>

<ref name=gcsrv>{{citation | last=Wilson | first=Ralph Elmer | year=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=[Carnegie Institution of Washington](/source/Carnegie_Institution_of_Washington) | location=Washington | bibcode=1953GCRV..C......0W | postscript=. }}</ref>

<ref name=aass34_1>{{citation | last1=Nicolet | first1=B. | year=1978 | title=Photoelectric photometric Catalogue of homogeneous measurements in the UBV System | journal=Astronomy and Astrophysics Supplement Series | volume=34 | pages=1–49 | bibcode=1978A&AS...34....1N | postscript=. }}</ref>

<ref name=mnras389_2_869>{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society) | volume=389 | issue=2 | pages=869–879 |date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 | s2cid=14878976 }}</ref>

<ref name=SIMBAD>{{cite simbad | title=* iot Aps | accessdate=2012-07-09 | postscript=. }}</ref>

<ref name=csiro>{{citation |title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=[Commonwealth Scientific and Industrial Research Organisation](/source/Commonwealth_Scientific_and_Industrial_Research_Organisation) |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |accessdate=2012-01-16 |url-status=dead |archiveurl=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=March 18, 2012 }}</ref>

<ref name=Finsen_1960>{{citation | postscript=.
 | title=New Double Stars (XVII)
 | last=Finsen | first=W. S.
 | journal=Monthly Notes of the Astronomical Society of Southern Africa
 | volume=19 | page=178 | year=1960
 | bibcode=1960MNSSA..19..178F }}</ref>

}}

==External links==
* [http://aladin.u-strasbg.fr/AladinPreview?-c=17+22+05.8760-70+07+23.549&ident=CCDM+J17221-7007AB&submit=Aladin+previewer Image Iota Apodis]

{{Stars of Apus}}

Category:B-type main-sequence stars
Category:Binary stars
Category:Apus
Apodis, Iota
6411
Category:Durchmusterung objects
156190
084979
Apodis, 58

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Adapted from the Wikipedia article [Iota Apodis](https://en.wikipedia.org/wiki/Iota_Apodis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Iota_Apodis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.