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Circular No. 7224 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) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304 Phone 617-495-7244/7440/7444 (for emergency use only) COMET C/1999 N2 (LYNN) Additional CCD astrometry: 1999 UT R.A. (2000) Decl. m2 Observer July 14.89331 9 58 15.16 -13 20 30.6 11.7 Jacques 14.89454 9 58 15.98 -13 20 21.1 11.6 " 14.89524 9 58 16.47 -13 20 15.6 11.6 " 14.89590 9 58 16.94 -13 20 10.3 11.6 " 14.89664 9 58 17.51 -13 20 03.9 11.1 " 14.92073 9 58 34.48 -13 16 51.8 11.4 " 14.92247 9 58 35.75 -13 16 37.1 11.3 " 15.36050 10 03 41.58 -12 18 33.2 14.3 Garradd 15.36175 10 03 42.46 -12 18 23.0 14.4 " 15.36219 10 03 42.76 -12 18 19.7 14.4 " 15.38878 10 04 01.09 -12 14 48.1 12.4 Zoltowski 15.39245 10 04 03.60 -12 14 18.8 12.4 " 15.39631 10 04 06.23 -12 13 48.2 12.4 " 15.40087 10 04 09.37 -12 13 12.0 12.4 " C. Jacques and L. Duczmal (Wykrota). 0.3-m f/3.3 reflector. G. J. Garradd (Loomberah). 0.45-m f/5.4 reflector. Thin ion tail in p.a. 141 deg with an apparent disconnection event (starting at 615" in p.a. 138 deg, continuing for at least 12'); coma diameter 8'.5. Rainy conditions. F. B. Zoltowski (Woomera). 0.30-m f/10 Schmidt-Cassegrain reflector. Preliminary parabolic orbital elements by B. G. Marsden: T = 1999 July 23.099 TT Peri. = 357.816 Node = 254.322 2000.0 q = 0.76096 AU Incl. = 112.443 1999 TT R. A. (2000) Decl. Delta r Elong. Phase m1 July 15 9 59.51 -13 06.5 0.580 0.777 49.5 95.9 7.2 16 10 10.90 -10 54.7 0.591 0.774 49.3 95.4 7.2 17 10 21.61 - 8 45.5 0.603 0.770 49.1 94.7 7.3 18 10 31.65 - 6 40.0 0.618 0.768 48.9 93.7 7.3 19 10 41.03 - 4 39.1 0.634 0.765 48.8 92.7 7.3 20 10 49.79 - 2 43.3 0.652 0.763 48.7 91.4 7.4 21 10 57.95 - 0 52.8 0.671 0.762 48.6 90.1 7.5 (C) Copyright 1999 CBAT 1999 July 15 (7224) Daniel W. E. Green
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