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Circular No. 6037 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Telephone 617-495-7244/7440/7444 (for emergency use only) TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505 MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU) PERIODIC COMET SHOEMAKER-LEVY 9 (1993e) Using the observed times of the more significant impacts of the cometary fragments, S. Nakano, Sumoto, Japan, updates the IAUC 6026 predictions of jovian central-meridian passages of the sites as follows (in order of the first passage on July 25 UT and assuming rotation with system III): site L, July 25.006 UT; G, 25.051; S, 25.059; R, 25.075; Q, 25.093; H, 25.135; E, 25.201; A, 25.236; C, 25.280; K, 25.340; W, 25.346. For the lesser observed impacts he finds: D, July 25.060 UT; B, 25.098; N, 25.107; F, 25.212; M, 25.331. Visual observations (communicated via the SL9 message center) around July 23.9 UT by J. Rogers using the 0.30-m Northumberland refractor at the University of Cambridge Observatories indicate the following: site L, large and dark, in several components; combined G + S (+ D), large and complex; R, tiny black spot south of the main line of spots; Q, single black spot; H, very dark, north of the main line. Summarizing recent reports by other observers, Rogers adds that sites E, A and C are still detectable (with some fading for A) and that the combined K + W site contains three or four dark nuclei (M and supposedly U being also in this region). There do not seem to be confirmed visual sightings of sites B, F (near E), N (near Q), P, Q2, T (near E) or V (near E). PERIODIC COMET McNAUGHT-HARTLEY (1994n) The following orbital elements, from MPC 23766, confirm this comet to be of short period (cf. IAUC 6016): T = 1994 Nov. 11.202 TT Peri. = 300.216 e = 0.61969 Node = 38.118 2000.0 q = 2.60969 AU Incl. = 17.655 a = 6.86205 AU n = 0.054831 P = 17.98 years 1994 TT R. A. (2000) Decl. Delta r Elong. Phase m1 July 27 21 28.85 -43 50.2 1.820 2.758 152.0 10.0 15.7 Aug. 6 21 22.41 -44 23.8 1.794 2.732 152.1 10.0 15.6 16 21 15.39 -44 32.3 1.792 2.709 148.8 11.2 15.6 26 21 09.01 -44 13.0 1.810 2.688 143.2 13.0 15.6 Sept. 5 21 04.28 -43 26.8 1.849 2.669 136.2 15.2 15.6 15 21 02.00 -42 16.6 1.905 2.653 128.8 17.2 15.6 25 21 02.51 -40 47.3 1.977 2.639 121.2 19.0 15.7 Oct. 5 21 05.79 -39 03.1 2.061 2.628 113.7 20.4 15.8 1994 July 25 (6037) Brian G. Marsden
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