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Circular No. 8840 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Mailstop 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 ISSN 0081-0304 Phone 617-495-7440/7244/7444 (for emergency use only) COMET 2007 K5 T. Lovejoy, Thornlands, Queensland, Australia, reports his discovery of a comet on twelve 90-s CCD images obtained on May 26 with a 200-mm f/2.8 camera lens, the object reported as circular, 1' across, with a clear blue-green color but no tail. J. Drummond (Gisborne, New Zealand, 0.20-m f/4.6 reflector) writes that his confirming images from May 28, obtained at altitude about 15 deg, show a moderately condensed coma of diameter about 1' and no tail. The following reported positions include precise astrometry by R. H. McNaught from images obtained with the 0.5-m Uppsala Schmidt telescope at Siding Spring, who reported a circular coma 0'.6 in diameter. Additional accurate astrometry is needed. 2007 UT R.A. (2000) Decl. Mag. Observer May 26.3424 5 50 24.9 -15 09 16 13 Lovejoy 26.3458 5 50 25.4 -15 09 11 " 28.28 6 00 18.2 -15 05 39.7 13 Drummond 28.31 6 00 24.87 -15 05 42.6 " 28.3458 6 00 34.4 -15 04 56 13 Lovejoy 28.3556 6 00 34.5 -15 05 07 " 29.27 6 05 15.77 -15 03 34.6 Drummond 29.34201 6 05 38.82 -15 03 15.2 McNaught 29.34442 6 05 39.56 -15 03 15.0 " 29.34673 6 05 40.25 -15 03 14.8 13.8 " (88611) TEHARONHIAWAKO I (SAWISKERA) The companion to minor planet (88611) Teharonhiawako = 2001 QT_297 (cf. IAUCs 7733 and 7765) has been named Sawiskera (cf. MPC 59388). COMET C/2006 P1 (McNAUGHT) Total visual magnitude estimates by S. Rae, Hamilton, New Zealand: Mar. 9.38 UT, 6.2 (10x50 binoculars); 18.65, 6.5; 20.64, 6.7; 23.64, 8.4 (0.25-m reflector); 26.65, 8.7; Apr. 9.31, 9.3; 15.31, 9.5; 18.68, 9.6; 22.36, 9.7; 24.47, 9.6; May 12.35, 10.1. COMET 96P/MACHHOLZ Total visual magnitudes by J. Gonzalez, Leon, Spain: Apr. 13.18 UT, 7.2 (25x100 binoc.); 18.16, 8.2; 22.17, 8.8; May 9.05, 10.9 (0.20-m refl.). (C) Copyright 2007 CBAT 2007 May 29 (8840) Daniel W. E. Green
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