Gušter (sazvežđe)
Gušter (lat. Lacerta) je malo sazvežđe na severnoj hemisferi, koje nema sjajnih zvezda. Zbog svog oblika, koji podseća na latinično slovo W, ponekad se naziva i „mala Kasiopeja“. Sazvežđe je krajem 17. veka definisao poljski astronom Johanes Hevelije.
| Sazvežđe | |
 | |
| Latinsko ime | Lacerta |
|---|---|
| Skraćenica | Lac |
| Genitiv | Lacertae |
| Simbolizuje | guštera |
| Rektascenzija | 22,5 |
| Deklinacija | +45 |
| Površina | 201 sq. deg. (68) |
| Najsjajnija zvezda | Alfa Guštera (3,78m) |
| Meteorski rojevi | nema |
| Susedna sazvežđa | |
| Vidljivo u rasponu +90° i −40°. U najboljem položaju za posmatranje u 21:00 čas u oktobru. | |
Zvezde
urediJedino najsjajnija zvezda ovog sazvežđa — Alfa Guštera — sa magnitudom 3,78 je sjajnija od 4. magnitude.[1] Osim nje, značajne zvezde su još Roe 47 — sistem koji se sastoji od 5 zvezda; i ADS 16402 — binarni zvezdani sistem čije su komponente nalik Suncu, a oko sekundarne komponente sistema kruži ekstrasolarni vreli gasoviti džin neuobičajeno male gustine.
Objekti dubokog neba
urediU sazvežđu Gušter nema Mesjeove objekte, sjajne galaksije niti zbijena zvezdana jata. Ima nekoliko rasejanih jata, uključujući NGC 7243 koje se nalazi na oko 2800 svetlosnih godina od Sunčevog sistema i sastoji se mahom od plavih i belih zvezda.
BL Guštera je prototip blazara, po kome je ova klasa objekata i dobila ime (od BL i kvazar). Kada je otkriven, mislilo se da je u pitanju promenljiva zvezda, otud i oznaka kao kod promenljivih.
Izvori
uredi- ^ Ridpath & Tirion 2001, str. 164–165.
Literatura
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- „RY Leonis Minoris – Pulsating White Dwarf”. SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Pristupljeno 22. 10. 2012.
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Spoljašnje veze
uredi
- The Deep Photographic Guide to the Constellations: Lacerta
- Star Tales – Lacerta
- Weasner's Mighty ETX Site, GO TO LACERTA (a constellation guide for amateur astronomers)
- Sazvežđe Gušter Arhivirano na sajtu Wayback Machine (3. januar 2012) na TopAstronomer.com (jezik: engleski)
