Electronic Telegram No. 2401 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbat@iau.org; cbatiau@eps.harvard.edu URL http://www.cfa.harvard.edu/iau/cbat.html 2010 PERSEID METEORS P. Jenniskens, SETI Institute; and J. Vaubaillon, Institut de Mecanique Celeste et de Calcul des Ephemerides, Paris, report that the annual Perseid shower (IAU Shower 7) is expected to peak with a broad maximum around Aug. 13d03h20m UT (solar longitude 140.14 deg, equinox 2000.0), with best viewing conditions in Europe in the early morning hours, while numerous long trails will be visibile in the early evening hours in (eastern) North America. In addition, a brief 1-hour period of elevated rates can occur from an encounter with dust ejected by comet 109P/Swift-Tuttle in 1479. Current models put this dust trail just outside of the earth's orbit. The peak time is predicted for Aug. 12d16h49m UT (solar longitude 139.7292 deg), which is an update from Jenniskens (2006, *Meteor Showers and their Parent Comets*, p. 657). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 August 4 (CBET 2401) Daniel W. E. Green