... Predictions for Leonids 2009 . 55P/Tempel-Tuttle , the parent comet of the Leonid stream, returns to perihelion every 33 years or so (in fact very close to 3 times a century), generating a new trail of meteoroids and dust each time. ... A review article by David Asher entitled `Leonid dust trail theories' is available as paper number 346 in the Armagh preprint/reprint series . ... McNaught and Asher have developed a model to estimate Zenithal Hourly Rates of meteors during trail encounters. ...