Electronic Telegram No. 2743 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network COMET C/2011 L6 (BOATTINI) A. Boattini reports his discovery of a comet (discovery observation tabulated below) on images taken with the 1.5-m reflector at Mt. Lemmon; follow-up images from June 9.2-9.3 UT show a very strong condensation and an almost-stellar appearance with a coma diameter of at least 3". 2011 UT R.A. (2000) Decl. Mag. Observer June 8.20999 14 58 04.44 -20 01 13.8 20.5 Boattini The available astrometry (including prediscovery Mt. Lemmon astrometry from May 28), the following preliminary parabolic orbital elements by G. V. Williams, and an ephemeris appear on MPEC 2011-L42. T = 2011 Jan. 21.2907 TT Peri. = 331.4880 Node = 214.4863 2000.0 q = 6.784647 AU Incl. = 171.4554 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2011 CBAT 2011 June 11 (CBET 2743) Daniel W. E. Green