RE: Tumblers Cosmos 2327 Rk, ASTRO-D Rk, and Iridium "920"

From: Michel Jacquesson (Michel.Jacquesson@wanadoo.fr)
Date: Thu Jul 13 2000 - 15:02:58 PDT

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    >
    > Last night Mike McCants had predictions for a pair of objects
    > to be quite close together and traveling in the same direction.
    > One of them, Cosmos 2327 Rk (96-004B, 23774) was tumbling very
    > nicely with a period of about 8.5 seconds.  This seems to be
    > significantly different from the online PPAS recent observations
    > data, which are from 1999.  Here's a PPAS format report:
    >
    > 96-  4 B 00-07-11 04:39:39   EC  161.4 0.5  19  8.50
    
    
       Here are my most recent observations of that sat :
    
    96-  4 B 00-06-12 00:55      MJ  360.2 0.3 49   7.3   A'A'  mag 5 --> 8
    96-  4 B 00-06-26 22:42      MJ  356.6 0.2 45   7.9   A'A'  mag 6 --> 8
    
    	The rotation seems to be decreasing. The three observations match very well
    : the rate of my 2 observations is 0.04"/d and the rate between Mike's
    measure and my second one is 0.02"/d
    
    
    > The last object we observed, Iridium 920 (24871, 97-34C; formerly
    > Iridium 20) was tumbling very rapidly, on the order of twice per
    > second.
    
    	I spotted that sat last year and more recently in June 2000 :
    
    97- 34 C 99-06-16 22:18      MJ   39.8 0.2  40  0.99  AA
    97- 34 C 99-06-21 22:48      MJ   50.7 0.2  50  1.014 A'A'
    97- 34 C 99-06-22 22:14      MJ  123.1 0.2 120  1.026 F'F'
    97- 34 C 99-07-01 22:09      MJ  102.6 0.2 100  1.026 AA
    97- 34 C 00-06-12 00:01      MJ                 1.06  T=124.08,err=0.02,F'F'
    
    	Maybe, I measured a double period (with binocs 7x50)?
    
    Michel JACQUESSON
    405' E  4936' N
    
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