Eridan (sazvežđe)
Sazvežđe Eridan se nalazi na južnom nebu ispod sažvežđa Bika i sastoji se od ne toliko sjajnih zvezda.[1] Eridan 40 je trojna zvezda. Glavna zvezda je Omikron 2, koju je 1783. otkrio Vilijam Heršel, za koju se verovalo da je prva dvojna zvezda. Godine 1851. Oto Vilhelm Struve je otkrio da je dvojna zveda duplo dvojna i da se u stvari sastoji od tri povezane zvezde. Primarna zvezda A je narandžasti patuljak, oko 4 milijarde godina starosti. Zvezda B je beli patuljak dok je zvezda C crveni patuljak. U naučno-fantastičnoj seriji „Zvezdane staze“, ove zvezde predstavljaju sistem u kome se nalazi planeta Vulkan.
Osobine[uredi | uredi izvor]
Zvezde[uredi | uredi izvor]
Na njegovom južnom kraju je zvezda Ahernar magnitude 0,5 zvezde, označena kao Alfa Eridani. To je plavo-bela zvezda glavne sekvence udaljena 144 svetlosne godine od Zemlje, čije tradicionalno ime znači „kraj reke”.[1] Ahernar je veoma neobična zvezda, jer je jedna od najravnijih zvezda poznatih. Zapažanja pokazuju da je njen poluprečnik oko 50% veći na ekvatoru nego na polovima. Ovo izobličenje nastaje zato što se zvezda vrti izuzetno brzo.
Reference[uredi | uredi izvor]
- ^ a b Ridpath & Tirion, str. 146–147.
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Spoljašnje veze[uredi | uredi izvor]
Vikimedijina Ostava ima datoteke za članak:
- The Deep Photographic Guide to the Constellations: Eridanus
- The clickable Eridanus
- Epsilon Eridani
- New 'Vulcan' Planet Tantalizes Astronomers Arhivirano 2001-02-19 na sajtu Wayback Machine
- Starry Night Photography - Eridanus Constellation
- Star Tales – Eridanus
- Warburg Institute Iconographic Database (medieval and early modern images of Eridanus)
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