Delfin (sazvežđe)
Delfin je malo sazvežđe severne hemisfere, jedno od 88 savremenih sazvežđa i jedno od 48 originalnih Ptolomejevih sazvežđa. Dva su mita povezana sa Delfinom. Po prvom, u pitanju je delfin koji je pomogao Posejdonu da osvoji Nereidu Anfitritu. Po drugom, radi se o delfinu koji je spasao život pesniku Arionu sa Lezbosa.
| Sazvežđe | |
 | |
| Latinsko ime | Delphinus |
|---|---|
| Skraćenica | Del |
| Genitiv | Delphini |
| Simbolizuje | delfina |
| Rektascenzija | 21 |
| Deklinacija | +10[1] |
| Površina | 189 sq. deg. (66) |
| Najsjajnija zvezda | Beta Delfina (3,63m) |
| Meteorski rojevi | nema |
| Susedna sazvežđa | |
| Vidljivo u rasponu +90° i −70°. U najboljem položaju za posmatranje u 21:00 čas u oktobru. | |
Zvezde uredi
Italijanski astronom Nikolo Kačatore je nazvao dve najsjajnije zvezde u Delfinu po svom imenu napisanom unazad: alfu Sualocin a betu Rotanev (od latinizovanog oblika svog imena Nicolaus Venator, Venator na latinskom i Cacciatore na italijanskom znače „lovac“). Najsjajnija zvezda Delfina je beta, magnitude 3,63, dok alfa ima magnitudu 3,77. Alfa se sastoji od 7 komponenti označenih od A do G, od toga su A i G fizički dvojne dok B, C, D, E i F samo vizuelno pripadaju ovom sistemu. Ro Orla je zvezda koja je pripadala sazvežđu Orla, ali je 1992. godine prešla granicu među sazvežđima i ušla u Delfin.
Nova Delphini 2013 (Nova Delfina 2013) je nova koju je 14. avgusta 2013. godine otkrio japanski astronom-amater Koiči Itagaki. Pre eksplozije, Nova Delfina je najverovatnije bila zvezda 17. magnitude, što znači da se njen sjaj povećao 25000 puta. U pitanju je klasična nova — binarni sistem u kome materijal sa hladnijeg džina prelazi na topliji beli patuljak na kome se skuplja sve dok ne dođe do termonuklearne reakcije.[2] Magnituda Nove Delfina je do 16. avgusta porasla na oko 5, čime je postala vidljiva golim okom.[3]
Objekti dubokog neba uredi
U Delfinu se nalazi nekoliko zanimljivih objekata dubokog neba. Prisutne su dve male plave planetatne magline — NGC 6891 (u blizini ro Orla) i NGC 6905. NGC 6934 je veliko globularno jato u blizini epsilon Delfina. NGC 7006 je udaljeno, sferno i relativno svetlo globularno jato u blizini gama Delfina.
Reference uredi
- ^ „Delphinus, Constellation Boundary”. The Constellations. International Astronomical Union. Pristupljeno 15. 7. 2020.
- ^ „Astronomy Picture of the Day”. NASA. 16. 8. 2013. Pristupljeno 16. 8. 2013.
- ^ Trumpić, Marino (16. avgust 2013). „Nova Delphini 2013 događaj godine?”. Astronomska udruga Vidulini. Pristupljeno 16. 8. 2013.
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Spoljašnje veze uredi
- Sazvežđe Delfin Arhivirano na sajtu Wayback Machine (3. januar 2014) na TopAstronomer.com (jezik: engleski)
- University of Wisconsin, "Delphinus" Arhivirano na sajtu Wayback Machine (7. mart 2016)
- The Deep Photographic Guide to the Constellations: Delphinus
- The clickable Delphinus
- Star Tales – Delphinus
- Warburg Institute Iconographic Database (medieval and early modern images of Delphinus)
