Tonight I observed a flare (glint, whatever) which *might* have been Landsat 4 (NORAD 13367). It was at 31 March 1998 03:48:43 UTC (Monday evening local time), at approx az 175, el 25, moving south to north, at least as bright as magnitude 0, plain white color. At first I thought it was an Iridium, but Skysat and Iridflar don't list anything likely. It looked like an Iridium (took a few seconds to brighten, was brightest for 1-2 seconds, then faded out of visibility in a few seconds). Using SatSpy 2.5, the closest match seems to be Landsat 4. Minimum observable magnitude is about 3.5, due to heavy light pollution. Tom Smith Anaheim, California, USA 117.9717 W 33.8423 N