Hello all; It is my sad duty to inform you of the death of Brian Marsden. He was the head of CBAT, the clearing house for astronomical information about comets, asteroids and other rapidly changing objects in the sky. He retired from that task in 2006 after many decades at its helm. Dr. Marsden was also the man who created many of the modern calculating algorithms to keep track of objects in the solar system. Here is his obituary. http://www.minorplanetcenter.org/mpec/K10/K10W10.html Clear skies to us all; Steve Coe -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.