Južna kruna (sazvežđe)
Južna kruna (lat. Corona Australis) je jedno od 88 modernih i 48 originalnih Ptolemejevih sazvežđa. Pre Ptolemeja nije smatrano za posebno sazvežđe, već samo za asterizam u Strelcu.
| Sazvežđe | |
 | |
| Latinsko ime | Corona Australis |
|---|---|
| Skraćenica | CrA |
| Genitiv | Coronae Australis / Coronae Austrinae[1][2][3] |
| Simbolizuje | Dionisova kruna |
| Rektascenzija | 19[4] |
| Deklinacija | -40[4] |
| Površina | 128 sq. deg. (80) |
| Najsjajnija zvezda | Alfa Južne krune (4,10m) |
| Meteorski rojevi | nema |
| Susedna sazvežđa | |
| Vidljivo u rasponu +40° i −90°. U najboljem položaju za posmatranje u 21:00 čas u avgustu.  | |
Zvezde uredi
U južnoj kruni nema zvezda sjajnijih od četvrte magnitude. Najsjajnije su alfa i beta Južne krune, megnitude 4,11. Alfa je i jedina zvezda ovog sazvežđa sa ličnim imenom — Alfeka meridijana.
U Južnoj kruni se nalazi i jedna od najbližih (na oko 200 svetlosnih godina) neutronskih zvezda — RX J1856.5-3754 — za koju se smatra da je nastala u eksploziji supernove pre oko milion godina.
Gama, kapa i lambda Južne krune su binarne zvezde.
Objekti dubokog neba uredi
Na pola puta između tete Južne krune i tete Škorpije se nalazi NGC 6541 — veliko, svetlo globularno jato. NGC 6729 je kombinacija refleksione i emisione magline koja se nalazi oko promenljive zvezde R Južne krune.
Reference uredi
- ^ Bagnall 2012, str. 170.
- ^ „Corona”. Merriam-Webster Dictionary., „Australis”. Merriam-Webster Dictionary..
- ^ „Corona Australis”. Dictionary.com Unabridged. Random House.
- ^ a b IAU, The Constellations, Corona Australis.
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Spoljašnje veze uredi
Vikimedijina Ostava ima datoteke za članak:
