Dear Mr. Ball, Those are certainly not the latest set of elements for SL9! I published a paper with Don Yeomans in 1996 which summarized our best solutions for the fragments. I have attached both the tables from that paper given both the heliocentric elements and jovicentric elements. The reference is: The Orbital Motion and Impact Circumstances of Comet Shoemaker-Levy 9, P.W. Chodas and D.K. Yeomans. In "The Collision of Comet Shoemaker- Levy 9 and Jupiter", (Eds. K.S. Noll, P.D. Feldman, and H.A. Weaver), Cambridge University Press, pp. 1-30, 1996. Best regards, Paul Chodas NASA/JPL NEO Program Office http://neo.jpl.nasa.gov At 11:28 PM 9/23/2002 -0400, you wrote: >Dear Sir: > >I've been trying to find out if there were any orbital ephemerides >published for comet Shoemaker-Levy 9 (1993e) after the ones published by >D.K. Yeomans and yourself on July 11, 1944. I discovered that document >on the Web at http://www.seds.org/pub/astro/SL9/info/elements.940711 >All of the other ephemerides I've found predated that one. > >If later predictions are available, where might I obtain copies? > >Thanks for whatever help you can provide. > >Selden E. Ball, Jr. >seb1@cornell.edu ============================= Attachment =============================== Table 3. Osculating heliocentric orbital elements for the fragments of comet Shoemaker-Levy 9. The elements are eccentricity (e), perihelion distance (q), argument of perihelion (w), longitude of the ascending node (Node), inclination (i), and time of perihelion passage (Tp). The angular orbital elements are referred to the ecliptic plane and equinox of J2000. Epoch 1994 May 8.0 TDB = JD 2449480.5 TDB e q (AU) w (deg) Node (deg) i (deg) Tp (1994 TDB) A 0.21620917 5.38056310 354.89352 220.537655 6.003294 Mar. 24.10320 B 0.21561980 5.38065243 354.90065 220.565286 5.990216 Mar. 24.52991 C 0.21516872 5.38041144 354.90826 220.581389 5.981965 Mar. 24.81127 D 0.21472534 5.38036971 354.91311 220.600306 5.972968 Mar. 25.10038 E 0.21441065 5.38031828 354.91615 220.613781 5.966629 Mar. 25.30070 F 0.21358484 5.38036243 354.93310 220.651606 5.948463 Mar. 25.96840 G 0.21288148 5.38011243 354.93416 220.680082 5.935514 Mar. 26.32445 H 0.21177932 5.37997339 354.94843 220.728309 5.912868 Mar. 27.08466 K 0.21042545 5.37977493 354.96756 220.788975 5.885070 Mar. 28.05310 L 0.20936108 5.37963171 354.98453 220.837514 5.863131 Mar. 28.84854 N 0.20827689 5.37953629 354.99998 220.886270 5.840458 Mar. 29.63448 P2 0.20788730 5.37960765 355.01194 220.904724 5.831257 Mar. 30.00933 P1 0.20774507 5.37968923 354.99938 220.909078 5.829288 Mar. 29.92297 Q2 0.20745337 5.37940298 355.01107 220.924560 5.823607 Mar. 30.23482 Q1 0.20740426 5.37934828 355.01099 220.927985 5.822819 Mar. 30.27142 R 0.20658149 5.37923176 355.02229 220.966459 5.805868 Mar. 30.87835 S 0.20573678 5.37912914 355.03337 221.006655 5.788483 Mar. 31.50454 T 0.20550407 5.37931862 355.03349 221.016204 5.783002 Mar. 31.63843 U 0.20516743 5.37914092 355.04151 221.034174 5.776310 Mar. 31.94418 V 0.20461625 5.37904612 355.05009 221.060787 5.764890 Apr. 1.37239 W 0.20428226 5.37890776 355.05614 221.077213 5.758370 Apr. 1.63988 Table 4. Osculating jovicentric orbital elements for the fragments of comet Shoemaker-Levy 9. The elements are eccentricity (e), perijove distance (q), argument of perijove (w), longitude of the ascending node (Node), inclination (i), and time of perijove passage (Tp). The angular orbital elements are referred to the ecliptic plane and equinox of J2000. Epoch 1994 May 8.0 TDB = JD 2449480.5 TDB e q (km) w (deg) Node (deg) i (deg) Tp (1994 TDB) A 0.99860178 37359.28 43.224821 284.754106 88.510529 July 16.98246 B 0.99859179 37635.83 43.245621 284.022794 87.742186 July 17.26248 C 0.99860684 37238.92 43.218524 285.032690 88.799176 July 17.44353 D 0.99860765 37223.04 43.219369 285.010446 88.776404 July 17.64044 E 0.99860837 37208.32 43.217578 285.104456 88.875632 July 17.77938 F 0.99860544 37300.48 43.229297 284.546587 88.280449 July 18.17450 G 0.99861241 37121.95 43.213977 285.353708 89.136959 July 18.46555 H 0.99861664 37024.28 43.212378 285.468492 89.256703 July 18.96760 K 0.99862089 36930.22 43.209596 285.784875 89.585060 July 19.59097 L 0.99862481 36841.23 43.209208 285.978211 89.783022 July 20.08892 N 0.99863152 36676.73 43.209216 285.807826 89.604233 July 20.60125 P2 0.99863451 36604.26 43.213545 285.252492 89.013508 July 20.80606 P1 0.99863423 36611.50 43.233503 284.468538 88.212721 July 20.85685 Q2 0.99863402 36621.70 43.208505 286.026438 89.832856 July 20.98913 Q1 0.99862993 36731.86 43.208967 286.330548 90.150681 July 21.00939 R 0.99863325 36655.41 43.209414 286.439518 90.264716 July 21.40164 S 0.99863588 36598.27 43.209765 286.452323 90.278231 July 21.80819 T 0.99864005 36489.40 43.216762 285.166900 88.935962 July 21.93115 U 0.99863734 36567.67 43.208609 286.028497 89.832581 July 22.09104 V 0.99863940 36521.02 43.208271 286.195726 90.006578 July 22.35899 W 0.99863886 36538.68 43.212640 286.774798 90.611613 July 22.51406