Steve, Check this site "Orbital Elements for Software Packages" They probably have the comet data your looking for. http://cfa-www.harvard.edu/iau/Ephemerides/SoftwareEls.html -- have a great day, and a clear night Stan Clark 33.43N, 112.35 W Saguaro Astronomy Club Webmaster www.saguaroastro.org -- -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.