Electronic Telegram No. 1518 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://www.cfa.harvard.edu/iau/cbat.html ORIONID METEORS 2008 P. Jenniskens, SETI Institute, reports that last year's strong activity of the Orionid meteor shower on Oct. 20.4-24.2 UT (cf. CBET 1108) may continue into 2008 and 2009, according to M. Sato and J.-I. Watanabe (PASJ 59, L21); they ascribed the 2007 activity to dust trails of comet 1P/Halley that were formed by meteoroids ejected in the years -1265, -1197, and -910. The orbital evolution is affected by the 1:6 mean-motion resonance with Jupiter. This so-called "filament" is expected to be in the earth's path again around Oct. 18-24 in 2008 and again in 2009, giving rise to a higher- than-normal Orionid-shower activity that is relatively rich in bright meteors. M. Sato (National Astronomical Observatory of Japan, Tokyo) predicts an encounter with the -1265 dust trail in the period 2h13m-8h08m UT on 2008 Oct. 19, peaking earlier than in 2007. The approach distance is slightly larger than in 2007, which could result in lower peak rates. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 September 27 (CBET 1518) Daniel W. E. Green