Electronic Telegram No. 2147 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 URSID METEORS 2009 P. Jenniskens, SETI Institute, reports significant Ursid shower activity over normal annual rates over the period 2009 Dec. 22d00h-22d15h UT. Pierre Martin at Ottawa, Canada, reported seeing a -5 magnitude Ursid at 6h00m UT, which left a 15-s persistent train. Visual observations starting at 7h30m UT gave apparent rates of 10-15 Ursids/hr under 6.3-magnitude skies. Both Ilkka Yrjola at Kuusankoski, Finland, and Esko Lyytinen at Helsinki, Finland, measured elevated rates using the technique of meteor forward scattering. From their data, the outburst peaked at Dec. 22d09h +/- 0.5 hr UT (solar longitude = 270.51 +/- 0.02 deg, equinox 2000.0), with a full-width-at-half- maximum of 6 +/- 1 hr. The shower was rich in overdense echoes. The outburst was due to the 'filament' dust component of comet 8P/Tuttle, the encounter of which was predicted at Dec. 22d06h UT with FWHM = 8.2 hr (Jenniskens 2006, *Meteor Showers and their Parent Comets*, p. 645). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 January 26 (CBET 2147) Daniel W. E. Green