Lovački psi (sazvežđe)
Lovački psi (lat. Canes Venatici) su sazvežđe severne hemisfere i jedno od 88 savremenih sazvežđa. Definisao ga je poljski astronom Johanes Hevelije u 17. veku. Sazvežđe predstavlja dva lovačka psa (Asterion i Hara) koje drži Volar dok goni Velikog i Malog medveda.
| Sazvežđe | |
 | |
| Latinsko ime | Canes Venatici |
|---|---|
| Skraćenica | CVn |
| Genitiv | Canum Venaticorum[1] |
| Simbolizuje | pse Volara |
| Rektascenzija | 13 |
| Deklinacija | +40[2] |
| Površina | 465 sq. deg. (38) |
| Najsjajnija zvezda | alfa Lovačkih pasa (2,90m) |
| Meteorski rojevi | nema |
| Susedna sazvežđa | |
| Vidljivo u rasponu +90° i −40°. U najboljem položaju za posmatranje u 21:00 čas u maju. | |
Zvezde uredi
Najsvetlija zvezda u sazvežđu je alfa Lovačkih pasa, dvojna zvezda magnitude 2,81 koja se nalazi na oko 110 svetlosnih godina od Sunca. Svetlija komponenta, alfa-2, ima magnetno polje oko 5000 puta snažnije od Zemljinog, i bogata je živom, silicijumom i europijumom. Alfa Lovačkih pasa zajedno sa Denebolom (beta Lava), Spikom (alfa Device) i Arkturusom (alfa Volara) čini asterizam „Veliki dijamant“ u kome se nalaze mnoge zvezde i galaksije. Denebola, Spika i Arkturus bez alfe Lovačkih pasa čine drugi poznati asterizam — „Prolećni trougao“.
Beta Lovačkih pasa je patuljak G-klase sa glavnog niza H-R dijagrama, vrlo sličan Suncu, zbog čega ga astrobiolozi smatraju jednom od najzanimljivijih zvezda. Mada je Hara ranije označavala južnog od dva lovačka psa, danas je sama beta Lovačkih pasa naziva Hara.
Y Lovačkih pasa je polupravilna promenljiva zvezda poznata po izrazito crvenoj boji. Jedna je od najsjajnijih ugljeničnih crvenih džinova i najsjajnija J-zvezda na nebu (zvezde sa visokim sadržajem ugljenika-13). Osim toga, sa procenjenom površinskom temperaturom od 2800 K, La Superba (kako ju je nazvao italijanski astronom Anđelo Seki u 18. veku) je jedna od najhladnijih poznatih zvezda. Okružuje je ljuska od odbačenog materijala prečnika 2,5 svetlosne godine.
AM Lovačkih pasa je kataklizmička vrlo plava promenljiva zvezda, 14. magnitude.
Objekti dubokog neba uredi
U Lovačkim psima se nalazi 5 Mesjeovih objekata — zbijeno zvezdano jato M3 i spiralne galaksije M51, M63, M94 i M106. M51 („Galaksija Vrtlog“) čine dve galaksije - mnogo veća i sjajnija NGC 5194 i njen satelit NGC 5195. M63 („Suncokret galaksija“) je vrlo svetla i izdužena galaksija koja se nalazi između M51 i alfe Lovačkih pasa. M106 se nalazi u blizini bete Lovačkih pasa.
Reference uredi
- ^ „Constellation Pronunciation Guide”. Space.com. 13. 12. 2006. Arhivirano iz originala 2020-10-03. g. Pristupljeno 2020-10-03.
- ^ Canes Venatici, constellation boundary (Izveštaj). The Constellations. International Astronomical Union. Arhivirano iz originala 2014-02-16. g. Pristupljeno 15. 2. 2014.
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Spoljašnje veze uredi
- Photos of Canes Venatici and the star clusters and galaxies found within it on AllTheSky.com
- Clickable map of Canes Venatici
- Photographic catalogue of deep sky objects in Canes Venatici (PDF) Arhivirano na sajtu Wayback Machine (7. avgust 2021)
- Sazvežđe Lovački psi Arhivirano na sajtu Wayback Machine (22. april 2012) na TopAstronomer.com
