Re: TLE questions

Bjoern Gimle@tt-tech.se (Gimle@tt-tech.se")
Wed, 19 Mar 1997 12:49:06 +0100

Rob Matson wrote : 
>To anyone who might know, I'm curious about the following entry in EL970308:
>1996-064A
>1 24656U 96064  A 96321.91676931  .00629804  15893-4  10000-3 0   164
>2 24656  51.7378  17.3247 0447172 173.4923 162.4622 17.47029567    16
>Obviously this object, which based on the inclination appears to have been
>associated with Mir (a Progress or Soyuz), is no longer in orbit.  But I'm
>curious about the high mean motion, and also why it's still retained after
>more than 3 months.

#24656 is the Mars 96 probe. It has decayed, unfortunately.

Allen Thomsson, who compiles elYYMMDD files, once asked me to supply
regular decay updates. I did for about half a year, but stopped when I
saw no effect, and received no other reply to my mails. Usually, there
are a dozen or two decayed objects in the files, and several outdated.
When OIG publishes some bad NCAT or Epochs, these may hang on for a long
time, and even block automatic updating. (When Epoch is in the future,
even their "Latest set" carries the error, and you must get the "Latest
5"
to find the updates)

>And can someone confirm that the Mir Deb LV-LZ sequence is out of order
>relative to the Norad #?  I have the following associations:
>23934 Mir Deb LT
>24287 Mir Deb LU (dec)
>24419 Mir Deb LV
>24657 Mir Deb LY (dec)
>24658 Mir Deb LW (decay imminent if not already) 

I have the following from weekly reports 11-21 and 11/27 ...
			
OBJECTS 24646,24647,24648,24650,24657, 24658 AND  24659 HAVE NOT BEEN
CATOLOGED BY USSPACECOM.

and my first elsets are:  
86017LX
1 24659U 86017LX  96361.91348337 +.00154610 +00000-0 +13391-2 0 00279
2 24659 051.6466 231.9025 0010292 177.3589 182.7508 15.68080338003581
86017
1 24659U 86017    96355.15364236 +.00168255 +00000-0 +15774-2 0 00237
2 24659 051.6480 266.2622 0012466 161.9906 198.1627 15.66045839002529
86017
1 24659U 86017    96351.25973447 +.00123833 +00000-0 +12342-2 0 00145
2 24659 051.6435 286.0110 0015620 153.1478 207.0854 15.64620990001912
86017LX
1 24659U 86017LX  96350.81244084 +.00123959 +00000-0 +12338-2 0 00148
2 24659 051.6489 288.2774 0017949 151.1858 209.0207 15.64605307001848
86017LX
1 24659U 86017LX  96339.75454284 -.00061273 +00000-0 -67395-3 0 00026
2 24659 051.6478 344.1784 0012164 094.7015 265.2453 15.62398637000119

Obviously there was some uncertainty from the start.
I cannot recall seeing this or similar errors, but there has been one
grossly out of sequence in a SatSit or two, but OK in the elsets.

Several errors in Int.ID and/or NCAT have occurred in the 60-day 
decay alerts.


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