Iridium flare and other obs

Ed Cannon (ecannon@mail.utexas.edu)
Fri, 10 Jul 1998 04:06:05 -0400

For 30.286N, 97.739W (UT Austin campus) I had these 
predictions for two almost simultaneous flares:

   Date      Time UTC   Alt.   Az.   Mag.
----------   --------   ----   ---   ---- 
1998-07-10   04:15:10    12    253    +2   Iridium 65
1998-07-10   04:15:17    10    253    -2   Iridium 75

Using one-power I only saw one flare, but it was more 
like -4 than -2.  It was really a good one, especially 
considering how low in the sky it was.  I assume that it 
most likely was Iridium 75 rather than 65 because of the 
predicted magnitude and time.  (It may have peaked even a 
few seconds later than 4:15:17.)

I saw Molniya 3-49 r1 (25380, 98-40B) again both Wednesday 
and Thursday nights from UT campus.  But it's going to be 
too far west and too early Friday night, I think.

Thursday evening Cosmos 2347 (25088, 97-79A) made a really 
good +1, near-zenith pass over here.  It appeared brightly
almost the second it exited the shadow.

For low-inclination observers, another very good one here
Thursday evening was one of my favorites, UHF F2 Rk (22788, 
93-56B), culmination 51 alt. at 185 az.  Its maxima were 
very easy to see even though the Sun was only 7.5 degrees 
set; they must have been about zero magnitude.  (The full 
Moon was still very low in the east at that time.)  So I 
think I'm going to boost its Quicksat intrinsic magnitude 
again, to +1.0.  A couple of nights ago Mike McCants timed
its period at about 7.3 seconds.

Ed Cannon -- ecannon@mail.utexas.edu -- Austin, Texas, USA