Electronic Telegram No. 442 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://cfa-www.harvard.edu/iau/cbat.html COMET 73P/SCHWASSMANN-WACHMANN Further to CBET 439, E. J. Christensen, Mt. Lemmon Survey, has reported four further components of comet 73P from observations with the 1.5-m reflector on Mar. 24.5 and 25.5 UT (and in some cases from Mar. 23.5). Component P, with magnitude estimates in the range 19.8-21.7, has positions corresponding to T = 2006 June 7.88 TT. Component Q, of mag 20.7-21.3, has T = 2006 June 7.74. Component R, of mag 20.5-20.8, has T = 2006 June 8.20. Component S, of mag 20.9=21.5, has T only some 0.001 day earlier than component K, which has now been redetected at mag 20.9-21.3. The astrometric observations are provided on MPEC 2006-F33. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 March 25 (CBET 442) Brian G. Marsden