I drove tonight to roughly 120.3 W, 34.5 N to try and spot an Iridium 21 flare transit the moon. The transit and flare would have occured around 0137 UT Nov 7. I had my 10 X 50 binoculars aimed just above the moon for a few minutes surrounding the expected flare time. I saw nothing. I expected I would at least see Iridium 21 at around Magnitude 6, but I didn't even see that. The sun was only 7 degrees below the horizon. Is there any pattern of consistancy regarding Iridium 21 and the other 3 "unpredictable" Iridiums? Are there certain conditions under which they give predictable flares? Aaron http://eci.ucsb.edu/~asb http://www.csua.berkeley.edu/~asb asb@eci.ucsb.edu 34.42 N 119.89 W