The following day, I tried setting up my camera on a tripod outside 15 minutes earlier than predicted time. This is a -8 magnitude flare, much brighter than Venus and I don't want to miss a good opportunity this time. I fired a few test shots to calibrate my exposure settings. Then I waited for the predicted time of 7:34 pm. When I saw a dim point moving, I immediately started my 15 seconds exposure. I was completely focused on that point and my camera that I missed the actual flare. When I checked my exposure, there were actually 2 satellites. The one I saw was not the Iridium 40. It was fortunate that I captured the satellites. It's like hitting 2 birds with 1 stone.
The dimmer satellite trail can be seen to the left of the flare from Iridium 40.