Summary of recent unid

From: michael.waterman@gecm.com
Date: Mon Apr 10 2000 - 07:02:09 PDT

  • Next message: Brierley David: "Correction to 96-72A"

    (A) Re my posting Apr 7 the second of the two orbits was the good one, 
        and has since been refined by Ted Molczan (posting 000409)
    
    (B) Current status of northbound sun-synchronous satellites.
        t50=time crossing latitude 50deg North latitude
        t50 & orbit are from circular orbit fit (by me)
    
     Observer Date   t50    Fixes Height Incl   Mag      Comment
              yymmdd hhmm   numbr  (km)  (deg)
       MW     000325 2127.7   2    813    98.6  6/8
       MW     000325 2132.4   2    671    97.5   7
       RE     000404 2132.5   2    685    98.3  7/8 P=.5   (a) "0009501"
       RE     000405 210*     1      -     -    6/8       "0009601"
       RE     000405 2215.9   2    778    98.3   7        "0009501"
       MW     000405 2207.7   2                  3       =91050A 2nd fix doubtful
       MW     000406 2136.3   2    700    98.9   7         (a)
       BG     000407 195*     1      -     -     7         (a)
       BG     000407 205*     1      -     -   Flash P=4.48
       MW     000407 2151.5   4    777    98.4  6/8 Irreg
       MW     000407 2227.7   2    689    98.9   8         (a)
       MW     000409 2129.4   2    774    98.5   8
       MW     000409 2227.7   3    692    99.1  8/9        (a)
    
    Note:(a) are all the same object: see (A) above. The 000407 observations
          were 0.14 min early, the 000409 obs were 0.58min early (on my
          elements).
    
    (C) There are several objects above with height about 790km.
        I fitted 2 orbits to the 000405 + 000407 ones, and on 000409 I
        looked for it without seeing anything close.
        Here are 3 orbits fitted to the 000407 + 000409 ones, but only
        the middle fit is really good.
    1 00000U 99000    00098.90103000 0.00000000                        0 
    2 00000  98.0260 174.1000 0344200 249.0400 107.2431 15.12611008    0 
    1 00000U 99000    00098.90091000 0.00000000                        0 
    2 00000  98.4300 174.7500 0126500 220.4400 138.6129 14.62090969    0 
    1 00000U 99000    00098.90079000 0.00000000                        0 
    2 00000  98.8340 175.4100 0170600 112.9700 248.8389 14.11587048    0 
    
    (D) Ted Molczan tells us that 99057C has broken up: presumably most 
        of the recent unids will be fragments of it, and will get 
        official NORAD ids sometime.
    
    Mike Waterman      michael.waterman@gecm.com
    
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