Electronic Telegram No. 1976
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 2009
     P. Jenniskens, SETI Institute, reports that the strong Orionid meteor
shower activity of 2006-2008 may repeat this year, according to M. Sato and
J.-I. Watanabe (2007, PASJ 59, L21); they ascribed the 2006-2008 activity to
dust trails of comet 1P/Halley that were formed by meteoroids ejected in the
years -1400 and -11.  The orbital evolution of the dust is affected by the 1:5
to 1:8 mean-motion resonances with Jupiter.  This so-called "filament"
component is expected to be in the earth's path again around Oct. 18-24 in
2009, giving rise to a higher-than-normal Orionid-shower activity that is
relatively rich in bright meteors.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 October 17                  (CBET 1976)              Daniel W. E. Green