Jedra (sazvežđe)
| Sazvežđe | |
 | |
| Latinsko ime | Vela |
|---|---|
| Skraćenica | Vel |
| Genitiv | Velorum |
| Simbolizuje | Jedra broda Argo |
| Rektascenzija | 9 |
| Deklinacija | -50 |
| Površina | 500 sq. deg. (32) |
| Najsjajnija zvezda | Gama Jedara (1,75m) |
| Meteorski rojevi | Pupidi-Velidi |
| Susedna sazvežđa | |
| Vidljivo u rasponu +30° i −90°. U najboljem položaju za posmatranje u 21:00 čas u martu. | |
Tadašnja praksa je bila da prikazuje izgled kao da neko spolja posmatra nebesku sferu, zato su zamenjene leva i desna strana.
Jedra (lat. Vela) je jedno od 88 modernih sazvežđa. Nastalo je deobom ranijeg sazvežđa Argo Navis („brod Argo“), koje je podeljeno na Pramac, Jedra i Krmu.
Zvezde[uredi | uredi izvor]
Nakon podele sazvežđa Argo Navis, novonastala sazvežđa su zadržala stare oznake zvezda, pa tako ne postoje alfa i beta Jedara. Najsjajnija zvezda ovog sazvežđa je gama Jedara (Suhail, „veličanstvena zvezda zakletve“) magnitude 1,78, zvezdani sistem od bar 6 komponenti. U ovom sistemu se nalazi i najteža Volf-Rajeova zvezda do sada otkrivena. Gama Jedara se nalazi na oko 800 svetlosnih godina od Sunčevog sistema.
Delta Jedara, po sjajnosti druga zvezda ovog sazvežđa, je takođe višestruki sistem, koji se sastoji od dve binarne zvezde. Magnitude 1,96, ovo je najsjanija eklipsna promenljiva, a nalazi se na 79,7 svetlosnih godina od Zemlje.
Treća zvezda po sjajnosti je lambda Jedara, nepravilna promenljiva čija se magnituda kreće između 2,14 i 2,30. Ovaj superdžin ili svetli džin se nalazi na oko 570 svetlosnih godina od Zemlje.
Delta i kapa Jedara i jota i epsilon Pramca čine asterizam nazvan „Lažni krst“ jer se nakada meša sa Južnim krstom, asterizmom iz sazvežđa Krst
Objekti dubokog neba[uredi | uredi izvor]
Pre 11 000 do 12 300 godina je ekplodirala supernova čiji je ostatak pulsar koji se nalazi u ovom sazvežđu. Sa ovom supernovom su povezane dve magline — planetarna maglina NGC 3132 i emisiona maglina NGC 2736.
Istorija[uredi | uredi izvor]
Argo Navis je bilo jedno od 48 klasičnih sazvežđa koje je naveo astronom Ptolomej iz 2. veka i predstavljao je brod Argo, koji su koristili Jason i Argonauti u potrazi za zlatnim runom u grčkoj mitologiji. Nemački kartograf Johan Bajer je prikazao sazvežđe na svojoj Uranometriji iz 1603. i dao Bajerovim zvezdama oznake od alfe do omega. Međutim, njegova karta je bila netačna jer sazvežđe nije bilo u potpunosti vidljivo sa severne hemisfere.[1]
Reference[uredi | uredi izvor]
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Spoljašnje veze[uredi | uredi izvor]
Vikimedijina Ostava ima datoteke za članak:
- Star Tales – Vela
- The clickable Vela
- Sazvežđe Jedra na TopAstronomer.com (jezik: engleski)
| Državne | |
|---|---|
| Ostale | |
