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 uredi
Jedino 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 uredi
U 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 uredi
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- „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.
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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)
