For those of you trying to catch the Cassini flyby, Using JPL's ephemerides, the following are estimates that may be of help: Closest approach 0328 UT 18 Aug. ~1200 km above Pitcairn Island in the South Pacific. Cassini enters earth shadow 03:31, exits 03:59. These estimates do not consider atmospheric refraction. Approximate magnitude from southeastern U.S. at entry (below horizon) 7.8, at exit 10.3. This assumes standard magnitude of 3.5 for Cassini (1000km, 50%illum.) which, like the rest of these estimates, are at best a slightly educated guess.