Zmaj (sazvežđe)
| Sazvežđe | |
 | |
| Latinsko ime | Draco |
|---|---|
| Skraćenica | Dra |
| Genitiv | Draconis |
| Simbolizuje | Zmaja |
| Rektascenzija | 17 |
| Deklinacija | +65 |
| Površina | 1083 sq. deg. (8) |
| Najsjajnija zvezda | Gama Zmaja (Eltanin) (2,23m) |
| Meteorski rojevi | Drakonidi |
| Susedna sazvežđa | |
| Vidljivo u rasponu +90° i −15°. U najboljem položaju za posmatranje u 21:00 čas u julu. | |
Zmaj (lat. Draco) je jedno od 88 modernih sazvežđa i 48 originalnih Ptolomejevih sazvežđa. Nalazi se na severnoj nebeskoj polulopti, a za većinu stanovnika severne zemljine polulopte (uključujući Balkan) nikada ne zalazi (cirkumpolarno je). Zmaj je to jedno od 48 sazvežđa koje je naveo astronom iz 2. veka Ptolomej, i danas je jedno od 88 savremenih sazvežđa. Severni pol ekliptike je u Zmaju.[1] Zmaj je cirkumpolaran (to jest, nikada ne zalazi) i može se videti tokom cele godine sa severnih geografskih širina.
Mitologija[uredi | uredi izvor]
Postoji više antičkih legendi koje se povezuju sa sazvežđem Zmaja. Prema jednoj, u pitanju je zmaj Ladon koji je čuvao vrt Hesperida a koga je Heraklo uspavao da bi ukrao zlatne jabuke iz vrta. Drugi zmaj koji se povezuje sa ovim sazvežđem je čuvar zlatnog runa koga je ubio Jason. Treći potencijalni mitološki zmaj koji je prenet na nebo je onaj koga je ubio Kadmo pre osnivanja Tebe, i iz čijih su zuba iznikli Sparti.
Zvezde[uredi | uredi izvor]
Najsvetlija zvezda u Zmaju je Eltanin (na arapskom zmija, gama Zmaja), narandžasti džin na 148 svetlosnih godina, magnitude 2,23.
Tuban (alfa Zmaja, bazilisk) je sa magnitudom 3,56 tek osma zvezda u Zmaju po sjajnosti. U vreme drevnih Egipćana, oko 2700. p. n. e., Tuban je bio polarna zvezda.
Objekti dubokog neba[uredi | uredi izvor]
U Zmaju se nalazi planetarna maglina Mačje oko (NGC 6543), sočivasta galaksija NGC 5866 i Zmaj patuljasta galaksija — galaksija koja je skoro potpuno izgubila međuzvezdani gas i ima uglavnom stare zvezde, a satelit je Mlečnog puta.
Reference[uredi | uredi izvor]
- ^ Ridpath & Tirion 2001, str. 142–143.
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- „LHS 2216 – High Proper Motion Star”. SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Pristupljeno 21. 10. 2012.
- „R Leonis Minoris – Variable Star of Mira Ceti type”. SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Pristupljeno 22. 10. 2012.
- „RY Leonis Minoris – Pulsating White Dwarf”. SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Pristupljeno 22. 10. 2012.
- „S Leonis Minoris – Variable Star of Mira Ceti type”. SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Pristupljeno 22. 10. 2012.
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Spoljašnje veze[uredi | uredi izvor]
Vikimedijina Ostava ima datoteke za članak:
- The Deep Photographic Guide to the Constellations: Draco
- The clickable Draco
- Star Tales – Draco
- Warburg Institute Iconographic Database (medieval and early modern images of Draco)
- Sazvežđe Zmaj Arhivirano na sajtu Wayback Machine (22. februar 2012) na TopAstronomer.com (jezik: engleski)
| Međunarodne | |
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| Državne | |
| Ostale | |
