Eta Ophiuchi

Eta Ophiuchi (Sabik)
η Ophiuchi'nin konumu (daire içine alınmış)
Gözlem verisi
Dönem J2000      Ekinoks J2000
Takımyıldız Yılancı
Sağ açıklık 17sa 10d 22.68689s[1]
Dik açıklık -15° 43′ 29.6639″[1]
Görünür büyüklük (V) 2,43[2] (3,05/3,27)[3]
Özellikler
Tayfsal sınıf A1 IV + A1 IV[3]
U−B renk ölçeği +0,09[2]
B−V renk ölçeği +0,05[2]
Astrometri
Dikey hız (Rv)-0,9[4] km/s
Özdevinim (μ) RA: +40,13[1] mys/y
Dec.: +99,17[1] mys/y
Iraklık açısı (π)36,91 ± 0,80 mys[1]
Uzaklık88 ± 2 ly
(27,1 ± 0,6 pc)
Yörünge[3]
Süre (P)87,58 ± 1,00 y
Yarı büyük eksen (a)1,396 ± 0,010″
Dış merkezlik (e)0,950 ± 0,020
Eğiklik (i)95,2 ± 2,0°
Yükseliş düğüm boylamı (Ω)38,9 ± 1,0°
Enberi dönemi (T)2024,68 ± 0,50
Enberi açısı (ω)
(ikincil)
274,8 ± 2,0°
η Oph A
Kütle2,966[3] M
Yarıçap2,5[5] R
Aydınlatma gücü35[5] L
Yüzey kütle çekimi (log g)3,74[6] cgs
Sıcaklık8.900[5] K
Metallik-0,01[6] dex
Dönüş hızı (v sin i)23[7] km/s
η Oph B
Kütle3,478[3] M
Yarıçap2[5] R
Aydınlatma gücü21[5] L
Sıcaklık8.600[5] K
Katalog belirtmeleri
35 Oph, BD–15°4467, GCTP 3895.00, Gl 656.1A/B, HD 155125, HIP 84012, HR 6378, SAO 160332, WDS J17104-1544AB.
Veritabanı kaynakları
SIMBADveri

Eta Ophiuchi (η Ophiuchi, kısaltması Eta Oph, η Oph), Yılancı takımyıldızında yer alan ikili yıldız sistemidir. Hipparcos görevi sırasında yapılan paralaks ölçümlerine göre, Güneş'ten yaklaşık 88 ışık yılı uzaklıktadır.

Eta Ophiuchi, WDS J17104-1544 olarak belirtilen çoklu yıldız sisteminin bir parçasıdır. Kendisi, WDS J17104-1544AB olarak belirtilir ve iki bileşeni WDS J17104-1544A (aynı zamanda sistemin geleneksel adı olan Sabik olarak bilinir)[8][9] ve WDS J17104-1544B'dir. 'C' bileşeni UCAC4 372-080717[10] ve 'D' bileşeni ise UCAC2 26022336 olarak belirtilir.[11]

Adlandırma

η Ophiuchi (Latinceleştirilmiş haliyle Eta Ophiuchi), yıldızın Bayer belirtmesidir. WDS J17104-1544AB, Washington Çift Yıldız Kataloğu'ndaki belirtmesidir. İki bileşeninin WDS J17104-1544 A ve B olarak belirtilmesi, Uluslararası Astronomi Birliği (IAU) tarafından benimsenen Washington Multiplicity Catalog'un (WMC) çoklu yıldız sistemleri için kullandığı yönteme dayanır.[12]

Geleneksel olarak kaynağı belirsiz olan ve Arapça "bir önceki" anlamına gelen al-sābiq السابق kelimesinden türetilen Sabik adıyla bilinirdi.[8] 2016 yılında Uluslararası Astronomi Birliği (IAU), yıldızlar için özel isimleri kataloglamak ve standartlaştırmak amacıyla bir Yıldız İsimleri Çalışma Grubu (WGSN) oluşturdu.[13] WGSN, 21 Ağustos 2016'da WDS J17104-1544 A bileşeni için Sabik adını onayladı ve bu ad, IAU tarafından onaylanan Yıldız Adları Listesi'ne dahil edildi.[9]

Çincede bu yıldız, Çin'deki on bir eski devleti temsil eden ve muhafazanın sol sınırını belirten bir asterizm olan 天市左垣 (Tiān Shì Zuǒ Yuán, Göksel Pazar Muhafazasının Sol Duvarı)'nın bir parçası olarak kabul edilir. Bu asterizm, Eta Ophiuchi, Delta Herculis, Lambda Herculis, Mu Herculis, Omicron Herculis, 112 Herculis, Zeta Aquilae, Theta¹ Serpentis, Eta Serpentis, Nu Ophiuchi ve Xi Serpentis'ten oluşur.[14] Sonuç olarak Eta Ophiuchi'nin Çince adı 天市左垣十一 (Tiān Shì Zuǒ Yuán shíyī, Türkçe: Göksel Pazar Muhafazasının Sol Duvarının On Birinci Yıldızı)'dır ve Song (宋) devletini temsil eder.[15][16]

Kaynakça

  1. ^ a b c d e van Leeuwen, F. (Kasım 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2), ss. 653-664, arXiv:0708.1752 $2, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ a b c Hoffleit, D.; Warren, W. H. Jr. (1991). "Entry for HR 2491". Bright Star Catalogue. 5th revised (Preliminary Version). CDS. 20 Mayıs 2011 tarihinde kaynağından arşivlendi.  ID V/50 5 Mart 2016 tarihinde Wayback Machine sitesinde arşivlendi..
  3. ^ a b c d e Docobo, J. A.; Ling, J. F. (Nisan 2007), "Orbits and System Masses of 14 Visual Double Stars with Early-Type Components", The Astronomical Journal, 133 (4), ss. 1209-1216, Bibcode:2007AJ....133.1209D, doi:10.1086/511070Özgürce erişilebilir 
  4. ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Washington, Washington: Carnegie Institution of Washington, s. 0, Bibcode:1953GCRV..C......0W 
  5. ^ a b c d e f Sabik 1 Aralık 2017 tarihinde Wayback Machine sitesinde arşivlendi.. stars.astro.illinois.edu. Retrieved July 1, 2024.
  6. ^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1). ss. 161-170. arXiv:astro-ph/0603770 $2. Bibcode:2006AJ....132..161G. doi:10.1086/504637. 
  7. ^ Royer, F.; Zorec, J.; Gómez, A. E. (Şubat 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2), ss. 671-682, arXiv:astro-ph/0610785 $2, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224 
  8. ^ a b Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations. 2. rev. Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7. 
  9. ^ a b "Naming Stars". IAU.org. 26 Kasım 2016 tarihinde kaynağından arşivlendi. Erişim tarihi: 27 Şubat 2018. 
  10. ^ "UCAC4 372-080717 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, 27 Şubat 2018 tarihinde kaynağından arşivlendi, erişim tarihi: 27 Şubat 2018 
  11. ^ "UCAC2 26022336 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, 27 Şubat 2018 tarihinde kaynağından arşivlendi, erişim tarihi: 27 Şubat 2018 
  12. ^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 $2. 
  13. ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, 10 Haziran 2016 tarihinde kaynağından arşivlendi, erişim tarihi: 22 Mayıs 2016. 
  14. ^ (Çince) 中國星座神話, yazan 陳久金. Yayınlayan 台灣書房出版有限公司, 2005, 978-986-7332-25-7.
  15. ^ (Çince) 香港太空館 - 研究資源 - 亮星中英對照表 18 Ağustos 2010 tarihinde Wayback Machine sitesinde arşivlendi., Hong Kong Uzay Müzesi. 23 Kasım 2010'da çevrimiçi olarak erişildi.
  16. ^ (Çince) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name 10 Ağustos 2010 tarihinde Wayback Machine sitesinde arşivlendi., Hong Kong Uzay Müzesi. 23 Kasım 2010'da çevrimiçi olarak erişildi.

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