Eta Draconis: Perbedaan antara revisi
Konten dihapus Konten ditambahkan
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k →Referensi: clean up |
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| (28 revisi perantara oleh 15 pengguna tidak ditampilkan) | |||
Baris 1:
{{Starbox
| name = Eta Draconis
}}
{{Starbox image
| image =
<div style="position: relative">[[Berkas:Draco IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Draco constellation and its surroundings]]
<div style="position: absolute; left: 43.8%; top: 47.2%;">[[Berkas:Cercle rouge 100%.svg|12px]]</div>
</div>
| caption=Lokasi η Draconis (dilingkari)
}}
{{Starbox observe
| epoch = [[J2000.0]]
| ra = {{RA|16|23|59.48594}}<ref name=aaa474_2_653/>
| dec = {{DEC|+61|30|51.1699}}<ref name=aaa474_2_653/>
| appmag_v = +2,73<ref name=pasj60_4_781/>
| constell = [[Draco (constellation)|Draco]]
}}
{{Starbox character
| class = G8 III<ref name=pasj60_4_781/>
| b-v = +0,91<ref name=aass34_1/>
| u-b = +0,70<ref name=aass34_1/>
| variable =
}}
{{Starbox astrometry
| radial_v = –14,3<ref name=gcsrv/>
| prop_mo_ra = –17,02<ref name=aaa474_2_653/>
| prop_mo_dec = +56,95<ref name=aaa474_2_653/>
| parallax = 35.42
| p_error = 0.09
| parallax_footnote = <ref name=aaa474_2_653/>
| absmag_v = +0,58<ref name=aaa361_614/>
}}
{{Starbox detail
| mass = 2,55<ref name=pasj60_4_781/>
| radius = 11<ref name=lang2006/>
| gravity = 2,82<ref name=pasj60_4_781/>
| metal_fe = –0,04<ref name=pasj60_4_781/>
| age_myr = 550<ref name=pasj60_4_781/>
| luminosity = 60<ref name=pasj60_4_781/>
| temperature = 5.055<ref name=pasj60_4_781/>
| rotational_velocity = 8<ref name=coapa239_1/>
}}
{{Starbox catalog
| names = Aldibain, Athebyne, 14 Draconis, [[Bonner Durchmusterung|BD]]+61 1591, [[Catalogues of Fundamental Stars|FK5]] 822, [[Henry Draper catalogue|HD]] 148387, [[Hipparcos catalogue|HIP]] 80331, [[Harvard Revised catalogue|HR]] 6132, [[New Catalogue of Suspected Variable Stars|NSV]] 7713, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 17074, [[Washington Double Star Catalog|WDS]] 16240+6131.<ref name=SIMBAD/>
}}
{{Starbox reference
|Simbad=eta+Dra
}}
{{Starbox end}}
'''Eta Draconis (η Dra / η Draconis)''' adalah salah satu bintang di rasi [[Draco]] . Eta Draconis memiliki [[magnitudo tampak]] +2,73<ref name=pasj60_4_781/> dan merupakan bintang raksasa kuning (''yellow giant'') dengan [[kelas spektrum]] G8 III.<ref name=pasj60_4_781/> Kecemerlangannya setara dengan 50 kali [[Matahari]]. Bintang ini berada pada jarak 92,1 [[tahun cahaya]] (28,2 [[parsec]]) dari [[Matahari]].<ref name=aaa474_2_653/>
== Etimologi ==
Nama tradisional bintang ini adalah '''Aldhibain''' (berasal dari [[bahasa Arab]] الذئبين ''al-Dhibain'') berarti "dua serigala". Nama lainnya untuk bintang ini adalah:
{| class="wikitable"
Baris 24 ⟶ 60:
! arti
|-
|紫微左垣三, 少宰 / Zǐwēizuǒyuánsān, Shǎozǎi||[[China]] ||bintang ketiga pada rasi [[Daftar asterisme di Batasan Ungu yang Terlarang#Dinding di Kiri|Dinding di Kiri]],
|}
Selain [[rasi]] [[Draco]], bintang ini juga merupakan anggota dari berbagai rasi atau asterisma berikut:
{| class="wikitable"
|-
! nama rasi / asterisma
! asal
! arti
! anggota lainnya
|-
| 紫微左垣/ Zǐwēizuǒyuán || [[China]] || [[Daftar asterisme di Batasan Ungu yang Terlarang#Dinding di Kiri|Dinding di Kiri]]||(antara lain) [[Iota Draconis|ι Dra]], [[Theta Draconis|θ Dra]], [[Zeta Draconis|ζ Dra]], [[73 Draconis|73 Dra]], [[23 Cassiopeiae|23 Cas]]
|}
Bintang "dua serigala" (''al-Dhibain'') ini merepresentasikan dua dari tujuh serigala (serigala lainnya adalah [[Zeta Draconis|ζ Dra]], [[Iota Draconis|ι Dra]], [[Theta Draconis|θ Dra]] dan [[Psi Draconis|ψ Dra]]) yang berhadapan dengan induk unta (''Alwaid'' - [[Xi Draconis|ξ Dra]], [[Nu Draconis|ν Dra]], [[Beta Draconis|β Dra]], [[Mu Draconis|μ Dra]], [[Gamma Draconis|γ Dra]]) yang melindungi anak-anaknya.
== Referensi ==
* {{cite web | title=HD 148387 -- Variable Star | work=SIMBAD Astronomical Database | url=http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=eta+draconis&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=2007-03-30}}
{{Reflist
<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 }}</ref>
<ref name=aaa361_614>{{citation | last1=Pizzolato | first1=N. | last2=Maggio | first2=A. | last3=Sciortino | first3=S. | title=Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases | journal=Astronomy and Astrophysics | volume=361 | pages=614–628 |date=September 2000 | bibcode=2000A&A...361..614P }}</ref>
<ref name=pasj60_4_781>{{citation | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke | title=Stellar parameters and elemental abundances of late-G giants | journal=Publications of the Astronomical Society of Japan | volume=60 | issue=4 | pages=781–802 |date=August 2008 | bibcode=2008PASJ...60..781T |arxiv = 0805.2434 | doi=10.1093/pasj/60.4.781}}</ref>
<ref name=gcsrv>{{cite book | last=Wilson | first=Ralph Elmer | date=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=[[Carnegie Institution of Washington]] | location=Washington | bibcode=1953GCRV..C......0W }}</ref>
<ref name=coapa239_1>{{cite journal | author=Bernacca, P. L. | author2=Perinotto, M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | date=1970 | bibcode=1970CoAsi.239....1B }}</ref>
<ref name=aass34_1>{{cite journal | last1=Nicolet | first1=B. | date=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 }}</ref>
<ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=[[Birkhäuser]] | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R<sub>*</sub>) is given by:
:<math>\begin{align} 2\cdot R_*
& = \frac{(28.23\cdot 3.72\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& \approx 22.6\cdot R_{\bigodot}
\end{align}</math></ref>
<ref name=SIMBAD>{{cite simbad | title=eta Dra | accessdate=2012-02-20 }}</ref>
}}
[[Kategori:Rasi bintang Draco]]
{{bintang-stub}}
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