Iridium 71 obs, Iridium 46 obs, Resurs 1-4 Rk obs

Mike McCants (mikem@freeside.fc.net)
Thu, 23 Jul 1998 01:37:59 -0500 (CDT)

I was able to spot Iridium 71 on a pass very low in my northeast.
I estimated that it varied from magnitude 6 to 8 with a period
on the order of 30 seconds.  I used my 8 inch.  The altitude
was 23, the azimuth was 76 and the range was about 1000 miles.

Although the current elset has a positive "drag" term, its mean
motion is smaller than the previous elset.  This indicates a
negative "drag" term.  Iridium 71 was estimated to be perhaps
20 seconds late.

Iridium 71
1 25320U 98026B   98202.16768940 +.00000509 +00000-0 +17484-3 0 01194
2 25320 086.3987 261.1062 0001238 033.8330 326.2943 14.34220250011483
Iridium 71
1 25320U 98026B   98203.14444799 +.00000202 +00000-0 +65075-4 0 01556
2 25320 086.3983 260.6986 0001253 029.1786 330.9480 14.34219529011629

We watched Resurs 1-4 and forgot to try to see Iridium 71 on
a subsequent pass low in the west.

I did see 5th magnitude flashes from Iridium 46 very, very low
in the northwest (14 degrees at 330?).  The fundamental period
for Iridium 46 is 7.5 seconds and the 5th magnitude flashes
were quite possibly every 2.5 seconds.

Resurs 1-4 Rk was measured at 7.5 seconds compared to 7.4 seconds
last night and 7.1 seconds last week, so it appears to be going up.

A single very bright (magnitude 0?) orange flash was observed from
Resurs 1-4 payload on Monday evening.

Molniya 3-13 Rk (11909) was observed magnitude 9.5-11 at a range
of 6000 miles with a period of 3.3 seconds.

Mike McCants