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{{Short description|Star in the constellation Aquila}}
{{Starbox begin |
{{about-distinguish|i Aquilae|iota Aquilae{{!}}ι Aquilae|71 Aquilae{{!}}l Aquilae}}
name=12 Aquilae }}
{{Starbox observe | {{Starbox begin
| name = 12 Aquilae
epoch=J2000 |
}}
ra=19<sup>h</sup> 01<sup>m</sup> 40.8272<sup>s</sup> |
{{Starbox image
dec= -05° 44′ 20.814″ |
| image=
appmag_v=4.027 |
{{Location mark
constell=] }}
|image=Aquila constellation map.svg|alt=|float=center|width=280
{{Starbox character |
|label=|position=right
class=K1III |
|mark=Red circle.svg|mark_width=10|mark_link=12 Aquilae
r-i = 0.54 |
|x=778|y=742
v-r = |
}}
b-v = 1.09 |
|caption=Location of 12 Aquilae (circled)
u-b = 1.09 |
}}
variable=] }}
{{Starbox astrometry | {{Starbox observe
| epoch = J2000
radial_v=-43.9 |
| ra = {{RA|19|01|40.82887}} <ref name=DR3/>
prop_mo_ra=-24.15 |
| dec = {{DEC|–05|44|20.7222}} <ref name=DR3/>
prop_mo_dec= -39.73 |
| appmag_v = 4.02<ref name=clpl4_99/>
parallax=21.95 |
| constell = ]
p_error=0.92 |
}}
absmag_v=5.133 }}
{{Starbox detail| {{Starbox character
| class = K1&nbsp;III<ref name=apj116/>
mass=0,8 |
| r-i = 0.54
radius=0,9 |
| v-r =
luminosity=0,4 |
| b-v = +1.104<ref name=aj135_1_209/>
temperature=3,500–5,000 |
| u-b = +1.04<ref name=clpl4_99/>
metal=? |
| variable =
rotation=< 17&nbsp;km/s <br />0,007348 Year |
age=? }} }}
{{Starbox astrometry

| radial_v = {{nowrap|–43.92 ± 0.18}}<ref name=aj135_1_209/>
{{Starbox catalog |
| prop_mo_ra = {{val|-22.592}}
names=ZI 1577, ] 05140-04781, ] J19014083-0544209, ] 23702, ] 176678, ] 11655, ] 5140-4781-1, i Aql, ] 93429, ] 4414, ] 23405, ]-05° 4840, ] 93429, ] 202441, ] 16146, ] 101794, ] 7193, ] 2302, ] 95 6515, ] 26141, ] 18589-0548, ] 2705, ] 0 4050, ] 11472, ] -10483, ] 142931, ] 3061. }}
| prop_mo_dec = {{val|-43.08}}
{{Starbox reference |
| pm_footnote = <ref name=DR3/>
Simbad=HD+176678
| ARICNS = }} | parallax = 21.5669
| p_error = 0.2199
{{starbox sources|HIP|CCDM|HR}}
| parallax_footnote = <ref name=DR3/>
| absmag_v = 0.726<ref name=aaa480_1_91/>
}}
{{Starbox detail
| mass = {{val|1.185|0.282}}<ref name=soubiran/>
| radius = {{val|12.28|0.14}}<ref name=soubiran/>
| luminosity = {{val|58.2|3.1}}<ref name=baines2018/>
| temperature = {{val|4662|59|fmt=commas}}<ref name=baines2018/>
| metal_fe = {{val|-0.08|0.07}}<ref name=soubiran/>
| gravity = {{val|2.31|0.11}}<ref name=soubiran/>
| rotational_velocity = 3.6<ref name=aj135_1_209/>
| age_gyr = {{val|3.64|1.43}}<ref name=baines2018/>
}}
{{Starbox catalog
| names = ]&nbsp;Aquilae, ]–05 4840, ] 176678, ]&nbsp;93429, ] 7193, ] 142931.<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad=12+Aql
}}
{{Starbox end}} {{Starbox end}}


'''12 Aquilae (12 Aql)''' or '''i Aquilae (i Aql)''' is a fourth-magnitude ] in the ] ]. 12 Aquilae is a star varying in both magnitude and spectral type. Its ] is 4.02. 12 Aquilae is located about 150 ]s from Earth. '''12 Aquilae''' (abbreviated '''12 Aql''') is a ] in the ] ] of ]. ''12 Aquilae'' has the ] of '''i Aquilae''' and is most easily recognized in the sky being next to the brighter star λ (lambda) Aquilae.


Sometimes, this star is called by the name '''Bered''', derived the ] word בָּרָד ''barad'', meaning "storm". In ], {{lang|zh|天弁}} ({{lang|zh-Latn|Tiān Biàn}}), meaning '']'', refers to an asterism consisting of 12 Aquilae, ], ], ], ], ], ], ] and ].<ref>{{zh icon}} ''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, 12 Aquilae itself is known as {{lang|zh|天弁六}} ({{lang|zh-Latn|Tiān Biàn liù}}, {{lang-en|the Sixth Star of Market Officer}}.) In ], {{lang|zh|天弁}} ({{lang|zh-Latn|Tiān Biàn}}), meaning '']'', refers to an asterism consisting of 12 Aquilae, ], ], ], ], ], ], ] and ].<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, 12 Aquilae itself is known as {{lang|zh|天弁六}} ({{lang|zh-Latn|Tiān Biàn liù}}, {{langx|en|the Sixth Star of Market Officer}}.)

This star has an ] of 4.02,<ref name=clpl4_99/> which is bright enough to be seen with the naked eye, although, according to the ], it is a challenge to view from the inner city. Based upon an annual ] shift of 21.57&nbsp;],<ref name=DR3/> the distance to this star is {{Convert|151|ly|pc|abbr=off|lk=on}} with a ] of one light-year. This is an ] ] of ] K1&nbsp;III.<ref name=apj116/> It has 12 times the radius of the Sun<ref name=soubiran/> and shines with 58 times the Sun's luminosity. This energy is being radiated from its ] at an ] of 4,662&nbsp;K,<ref name=soubiran/> giving it the cool orange hue of a ].<ref name=csiro/>


==References== ==References==
{{reflist|refs=
* {{cite web| title=HD 176678 -- Variable Star | work=SIMBAD Astronomical Database | url=http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=12+aquilae&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2005&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0 | accessdate=2007-01-21}}

{{reflist}}
<ref name=DR3>{{Cite DR3|4254220979971917056}}</ref>

<ref name=aj135_1_209>{{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | postscript=. |date=January 2008| s2cid=121883397 | doi-access=free }}</ref>

<ref name=clpl4_99>{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=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 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J | 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="soubiran">{{Citation |last=Soubiran |first=C. |last2=Creevey |first2=O. L. |last3=Lagarde |first3=N. |last4=Brouillet |first4=N. |last5=Jofré |first5=P. |last6=Casamiquela |first6=L. |last7=Heiter |first7=U. |last8=Aguilera-Gómez |first8=C. |last9=Vitali |first9=S. |last10=Worley |first10=C. |last11=de Brito Silva |first11=D. |date=2024-02-01 |title=Gaia FGK benchmark stars: Fundamental Teff and log g of the third version |bibcode=2024A&A...682A.145S |journal=Astronomy and Astrophysics |volume=682 |pages=A145 |doi=10.1051/0004-6361/202347136 |issn=0004-6361}} at ].</ref>

<ref name=aaa480_1_91>{{citation | display-authors=1 | last1=Soubiran | first1=C. | last2=Bienaymé | first2=O. | last3=Mishenina | first3=T. V. | last4=Kovtyukh | first4=V. V. | title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants | journal=Astronomy and Astrophysics | year=2008 | volume=480 | issue=1 | pages=91–101 | bibcode=2008A&A...480...91S | doi=10.1051/0004-6361:20078788 | postscript=. |arxiv = 0712.1370 | s2cid=16602121 }}</ref>

<ref name=apj116>{{citation | title=The Spectra of the Bright Stars of Types F5-K5 | last=Roman | first=Nancy G. | journal=Astrophysical Journal | volume=116 | page=122 | doi=10.1086/145598 | bibcode=1952ApJ...116..122R | postscript=. |date=July 1952| doi-access=free }}</ref>

<ref name=SIMBAD>{{cite simbad | title=i Aql | access-date=2012-07-22 | postscript=. | mode=cs2 }}</ref>

<ref name=csiro>{{citation|title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=] |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |accessdate=2012-01-16 |postscript=. |url-status=dead |archiveurl=https://web.archive.org/web/20120222183238/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=February 22, 2012 }}</ref>

}}


==External links== ==External links==
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{{Stars of Aquila}}


{{DEFAULTSORT:12 Aquilae}}
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{{Giant-star-stub}}
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{{var-star-stub}}

]
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]

Latest revision as of 16:05, 22 October 2024

Star in the constellation Aquila This article is about i Aquilae. Not to be confused with ι Aquilae or l Aquilae.
12 Aquilae
Location of 12 Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19 01 40.82887
Declination –05° 44′ 20.7222″
Apparent magnitude (V) 4.02
Characteristics
Spectral type K1 III
U−B color index +1.04
B−V color index +1.104
R−I color index 0.54
Astrometry
Radial velocity (Rv)–43.92 ± 0.18 km/s
Proper motion (μ) RA: −22.592 mas/yr
Dec.: −43.08 mas/yr
Parallax (π)21.5669 ± 0.2199 mas
Distance151 ± 2 ly
(46.4 ± 0.5 pc)
Absolute magnitude (MV)0.726
Details
Mass1.185±0.282 M☉
Radius12.28±0.14 R☉
Luminosity58.2±3.1 L☉
Surface gravity (log g)2.31±0.11 cgs
Temperature4,662±59 K
Metallicity −0.08±0.07 dex
Rotational velocity (v sin i)3.6 km/s
Age3.64±1.43 Gyr
Other designations
i Aquilae, BD–05 4840, HD 176678, HIP 93429, HR 7193, SAO 142931.
Database references
SIMBADdata

12 Aquilae (abbreviated 12 Aql) is a star in the equatorial constellation of Aquila. 12 Aquilae has the Bayer designation of i Aquilae and is most easily recognized in the sky being next to the brighter star λ (lambda) Aquilae.

In Chinese, 天弁 (Tiān Biàn), meaning Market Officer, refers to an asterism consisting of 12 Aquilae, α Scuti, δ Scuti, ε Scuti, β Scuti, η Scuti, λ Aquilae, 15 Aquilae and 14 Aquilae. Consequently, 12 Aquilae itself is known as 天弁六 (Tiān Biàn liù, English: the Sixth Star of Market Officer.)

This star has an apparent visual magnitude of 4.02, which is bright enough to be seen with the naked eye, although, according to the Bortle Dark-Sky Scale, it is a challenge to view from the inner city. Based upon an annual parallax shift of 21.57 mas, the distance to this star is 151 light-years (46 parsecs) with a margin of error of one light-year. This is an evolved giant star of stellar class K1 III. It has 12 times the radius of the Sun and shines with 58 times the Sun's luminosity. This energy is being radiated from its outer atmosphere at an effective temperature of 4,662 K, giving it the cool orange hue of a K-type star.

References

  1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. ^ Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
  4. ^ 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, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
  5. Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
  6. ^ Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (2024-02-01), "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version", Astronomy and Astrophysics, 682: A145, Bibcode:2024A&A...682A.145S, doi:10.1051/0004-6361/202347136, ISSN 0004-6361 12 Aquilae's database entry at VizieR.
  7. ^ 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, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
  8. "i Aql", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-07-22.
  9. (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.
  10. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on February 22, 2012, retrieved 2012-01-16.

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