I found a couple of places on the net that have comet ephemerides for either 1950 or 2000 epochs - so one does not have to compute them. There was also a basic program published around 1990 in Sky & Telescope that creates hardcopy of a comet orbit and you assemble it into a comet model (called Origami Orbits or something similar). You plug-in the comet elements and it prints hardcopy to cut & paste (the old kind of cut & paste). P.S. Looking at the comet last night (3.0 UT 3-29), I saw no evidence of the nucleus breaking-up. Has anyone else seen (vs. heard) this? R. B. Minton Computer Specialist Information Resources Management Services Denver Veterans Affairs Medical Center 1055 Clermont St., Denver, CO., 80220 USA (303)393-2881/FTS(700)322-2881/FAX(303)393-4671 System: Macintosh w/ POPmail Browser on Netscape Location: +40.08 -104.79 (Fort Lupton, CO.) R. B. Minton Computer Specialist Information Resources Management Services Denver Veterans Affairs Medical Center 1055 Clermont St., Denver, CO., 80220 USA (303)393-2881/FTS(700)322-2881/FAX(303)393-4671 System: Macintosh w/ POPmail Browser on Netscape Location: +40.08 -104.79 (Fort Lupton, CO.)