1998 Jun 15 05:03:24 UTC +- 2 seconds Last of 7 flashes of NORAD24871 (Iridium 20aka18) sighted. First flash about mag. 0 followed by 5 flashes about mag. -1 followed by 1 flash about mag. 0. I clocked 5 periods in 4.69 seconds, computed average period = 0.938 seconds. Others have recently reported double flashing episodes separated by about 1 1/2 minutes. I stopped looking after seeing the flashes noted above so I may have missed a 2d episode. Earlier sightings last evening 6/14/98 local, 1998 Jun 15 UTC: UTC 04:07 #16791 COSMOS 1758 with 10x50 04:16 #21701 UARS with 10x50, also visible at 1x 04:23 #18187 COSMOS 1867 with 10x50, est. mag. 3, 2 mags brighter than predicted 04:34 #15333 COSMOS 1603 with 10x50 04:53 #10967 SEASAT 1, easy at 1x, est. mag. 1, 2 mags brighter than predicted -- Frank Reed Scottsdale, Arizona, USA 111.898W 33.484 N 1227 feet