Alfa Monocerotidy

Alfa Monocerotidy jsou meteorický roj s mezinárodní zkratkou AMO aktivní v listopadu, nesmí být zaměňován s prosincovými Monocerotidy s mezinárodní zkratkou MON. Roj je pozorovatelný každý rok od 15. do 25. listopadu, vrchol aktivity připadá na 21. nebo 22. listopad. Rychlost meteorů je 65 km/s. Obvykle má nízkou zenitální hodinovou frekvenci (ZHR), ale občas vytváří pozoruhodné meteorické bouře, které trvají méně než hodinu. Tato zvýšení aktivity byla pozorována v letech 1925, 1935, 1985 a 1995. Peter Jenniskens předpověděl zvýšenou aktivitu v roce 1995 na základě hypotézy, že tato zvýšení aktivity byla způsobena prachovým ohonem dlouhé komety, která se příležitostně potulovala v blízkosti Země kvůli planetárním poruchám. Během pozorování v jižním Španělsku, kde byl nápomocen tým pozorovatelů z Dutch Meteor Society, Jenniskens potvrdil, že se meteoroidy pohybovaly na oběžné dráze dlouhoperiodické komety. Zvýšená aktivita z roku 1995 umožnila vědcům určit přesně radiant roje a solární délku vrcholu, stejně jako potvrzení o krátkém trvání zvýšené aktivity Alfa Monocerotid (méně než jednu hodinu). Mateřské těleso, pravděpodobně dlouhoperiodická kometa, není známo.[1]

Reference

V tomto článku byl použit překlad textu z článku Alpha Monocerotids na anglické Wikipedii.

  1. JENNISKENS, P.; BETLEM, H.; DE LIGNIE, M.; LANGBROEK, M. The Detection of a Dust Trail in the Orbit of an Earth-threatening Long-Period Comet. Astrophysical Journal. 1997, s. 441. DOI 10.1086/303853. Bibcode 1997ApJ...479..441J. 

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