Trougao (sazvežđe)
Trougao (lat. Triangulum) je jedno od 88 savremenih i 48 originalnih Ptolomejevih sazvežđa. Prvobitno je nazvano Deltoton, по делти Нила. У 17. веку је пољски астроном Петар Планције поред Троугла сместио и Мали троугао (Triangulum Minus), ali se to sazvežđe više ne koristi. Trougao je jedno od najmanjih sazvežđa severne hemisfere.
| Sazvežđe | |
 | |
| Latinsko ime | Triangulum |
|---|---|
| Skraćenica | Tri |
| Genitiv | Trianguli |
| Simbolizuje | trougao ili deltu Nila |
| Rektascenzija | 2 |
| Deklinacija | +30[1] |
| Površina | 132 sq. deg. (78) |
| Najsjajnija zvezda | beta Trougla (3m) |
| Meteorski rojevi | nema |
| Susedna sazvežđa | |
| Vidljivo u rasponu +90° i −60°. U najboljem položaju za posmatranje u 21:00 čas u decembru. | |
Slika je u ogledalu, tj. zamenjene su leva i desna strana u skladu sa tadašnjom praksom da se nebeska sfera prikazuje „gledano spolja“.
Zvezde
urediNajsjajnija zvezda u Trouglu je beta, magnitude 3. Ovaj beli džin, nekad nazivan i Deltotum je od Sunca udaljen približno 124 svetlosne godine.
Druga po magnitudi je alfa Trougla, spektroskopska dvojna zvezda koja je od Sunca udaljena 64,1 svetslosnu godinu. Njena tradicionalna imena (Mothallah, Rasal Muthallah ili Caput Trianguli) znače „glava trougla“. Primarna komponenta je žutobeli subdžin, a pratilac je udaljen manje od šest miliona kilometara. Magnituda alfe Trougla je 3,41.
Delta trougla je takođe spektroskopska dvojna zvezda čije su komponente žuti i narandžasti patuljak. Od Sunca je udaljena oko 35 svetlosnih godina, a magnitude je 4,87.
Objekti dubokog neba
uredi
U Trouglu se nalazi jedan Mesjeov objekat — M33 ili galaksija Trougao. M33 je treća najveća galaksija u Lokalnoj grupi, prečnika 50.000 svetlosnih godina. Udaljena je od Sunca oko 3 miliona svetlosnih godina, a po tipu je spiralna galaksija.
U Trouglu se nalazi i nekoliko drugih galaksija, ali nijedna sjajnija od 11. magnitude. Najveća je spiralna galaksija sa prečkom NGC 925, udaljena od Sunca oko 45 miliona svetlosnih godina.
Reference
uredi- ^ „Triangulum, Constellation Boundary”. The Constellations. International Astronomical Union. Pristupljeno 24. 5. 2013.
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