For those who care about such things, revised orbits for both Q4 NEAT and T7 LINEAR were published today by Brian Marsden at the Minor Planet Center: http://cfa-www.harvard.edu/mpec/K04/K04K36.html http://cfa-www.harvard.edu/mpec/K04/K04K37.html These show hyperbolic orbits for both comets, and the suggestion that comparable solutions can be obtained with nongravitational (jetting) effects added. The changes with the new elements are trivial in terms of the actual ephemeris. \Brian -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.