Hi all - I observed four passes by irregular Iridia satellites (those not in the standard operational orbits), along with a few other interesting objects, with the following results (first, the Quicksat predictions; heights and ranges in miles): 1998 May 31 Sun UT 319 1038 1998 Coal Creek Canyon, CO 2000 15.0 15 F F T T F H M S Al AziC Dir Mag Dys F Hgt Shd Rng R A Dec Name 4 7 3 34 272C 268 7.8 3 2 474 403 764 925 22.5 Iridium 11 Two flashes to mag. 0 at 04:06:00, while in the northeast sky. 4 50 27 82 85C 87 5.5 3 9 394 88 397 15 3 40.0 Iridium 21 One flash to mag. 2 at culmination, just before shadow entry. 5 10 42 58 82C 87 6.2 3 1 481 83 557 1728 36.6 Iridium 18 Five quick flashes to mag. 0 at 05:10:30, near culmination, all within 2 seconds (i.e., 2 flashes/second). 5 45 15 66 268C 267 6.2 3 2 480 61 520 1319 34.8 Iridium 42 First saw at mag. 5 in the bowl of the Big Dipper, then a slow fade to invisibility at 1x, then return to mag. 5, then shadow entry. About 1 minute between brightness peaks. So, it looks like Iridium 18 has joined the likes of 11, 21, and 27. Also, an observation of the Swedish Viking satellite: 3 32 52 76 71C 275 11.0 3 8 46474495 4715 1420 42.8 Viking 16614=86-19B Observed 0332-0344, mag. 12-13, brighten unsteadily to mag. 12, then sudden fade back to mag. 13, this pattern repeating every 8 seconds. A few flashes to mag. 11 towards end of observation, as object sank in the north. And, good old TiPS passed almost overhead: 6 42 38 81 53C 87 6.2 13 4 657 150 665 1658 44.9 TiPS Obs. with 12" at 33x, "Ralph" and "Norton" at the ends of the tether were mostly mag. 8-9, with occasional slow flashes to magnitude 7. Finally, the International Ultraviolet Explorer, which looked much the same as the last time I observed it. Here's the Highfly output: 1998 May 26 UT 10637 IUE 78 12A 7.5 M 3.5 ELDY 14 M2 0 H M Al Azi Mag Hgt RA Dec Range 6 15 64 239 11.4 19918 13 49.2 23.4 20267 6 45 61 230 11.4 20345 14 24.6 18.6 20769 7 15 57 224 11.4 20802 14 56.3 13.6 21346 Observed 0630-0705, mag. 13 with flashes to mag. 12. Flash pattern: fffx, i.e., 3 flashes then a missing one. Timed 28 cycles/122s = 4.36s period (or about 1.1 seconds between flashes). Kurt: I'm sending the obs in PPAS format separately. Cheers, Rich Keen Coal Creek Canyon, Colorado, USA (39.877 N, 105.391 W, elevation 2728m)