Helene (uydu)

Helene
Kanalları ve görünen toz (regolit) akışlarını gösteren, önde olan yarımkürenin yüksek çözünürlüklü fotoğrafı (Cassini, Haziran 2011)
Keşif[1]
KeşfedenP. Laques
J. Lecacheux
Keşif yeriPic du Midi Gözlemevi
Keşif tarihi1 Mart 1980
Adlandırmalar
MPC belirtmesiSaturn XII
Adın kaynağı
Truvalı Helen (Ἑλένη Helenē)
Alternatif adlar
  • Dione B
  • S/1980 S 6
SıfatlarHelenean
Yörünge özellikleri
377.396 km
Dış merkezlik0,0022
2,736915 g[2]
Eğiklik0,199° (Satürn'ün ekvatoruna)
Doğal uydusuSatürn
GrupL4 Dione truvası
Fiziksel özellikler
Boyutlar43,4 × 38,2 × 26 km[3]
Ortalama yarıçap
17,6 ± 0,4 km[3]
varsayılan eş zamanlı
sıfır
Albedo1,67 ± 0,20 (geometrik)[4]
  Wikimedia Commons'ta ilgili ortam

Helene, Satürn'ün doğal uydusudur. 1980 yılında Pierre Laques ve Jean Lecacheux tarafından Pic du Midi Gözlemevi'nde yer tabanlı gözlemlerle keşfedildi[1] ve S/1980 S 6 olarak adlandırıldı.[5] 1988 yılında resmi olarak Yunan mitolojisinde Kronos'un (Satürn) torunu olan Truvalı Helen'in adını aldı.[6] Helene ayrıca, 1982'de verilen Saturn XII (12) veya Dione B olarak da adlandırılır,[7] çünkü Dione ile birlikte eş-yörüngededir ve önde olan Lagrange noktasında (L4) bulunur. Bilinen dört truva uydusundan biridir.

Kaynakça

  1. ^ a b Lecacheux, Jean. (Temmuz 1980). "A new satellite of Saturn: Dione B". Icarus. 43 (1). ss. 111-115. Bibcode:1980Icar...43..111L. doi:10.1016/0019-1035(80)90093-7. 
  2. ^ NASA Celestia9 Mart 2005 tarihinde Wayback Machine sitesinde arşivlendi.
  3. ^ a b Thomas, P. C. (Temmuz 2010). "Sizes, shapes, and derived properties of the saturnian satellites after the Cassini nominal mission" (PDF). Icarus. 208 (1). ss. 395-401. Bibcode:2010Icar..208..395T. doi:10.1016/j.icarus.2010.01.025. 23 Aralık 2018 tarihinde kaynağından (PDF) arşivlendi. Erişim tarihi: 29 Ağustos 2022. 
  4. ^ Verbiscer, A.; French, R.; Showalter, M.; Helfenstein, P. (9 Şubat 2007). "Enceladus: Cosmic Graffiti Artist Caught in the Act". Science. 315 (5813). s. 815. Bibcode:2007Sci...315..815V. doi:10.1126/science.1134681. PMID 17289992. 
  5. ^ Marsden, Brian G. (31 Temmuz 1980). "Satellites of Saturn" (keşif). IAU Circular. Cilt 3496. 28 Ekim 2017 tarihinde kaynağından arşivlendi. Erişim tarihi: 23 Aralık 2011. 
  6. ^ Marsden, Brian G. (8 Haziran 1988). "Satellites of Saturn and Uranus" (adlandırma). IAU Circular. Cilt 4609. 27 Mart 2012 tarihinde kaynağından arşivlendi. Erişim tarihi: 23 Aralık 2011. 
  7. ^ Marsden, Brian G. (30 Eylül 1983). "Satellites of Jupiter and Saturn". IAU Circular. Cilt 3872. 25 Temmuz 2011 tarihinde kaynağından arşivlendi. Erişim tarihi: 23 Aralık 2011. 

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