Re: Rate SPACECOM generates elsets

Phillip Clark (psclark@dircon.co.uk)
Sat, 22 Aug 1998 08:06:59 +0100 (BST)

I do not have a direct answer to this question, but using differences 
between orbital epochs does not suggest an answer.

The orbital epochs which are given in the TLEs are normally projected 
back in time to give the northbound equator-crossing time for that 
particular circuit of the Earth, and therefore do not reflect the time 
interval between orbital measurements.   The example given simply shows 
that two TLEs were generated within one orbital period for this 
particular object, and thus we have slightly different orbits.

Phillip Clark


On Fri, 21 Aug 1998 gardjw@juno.com wrote:

> Please excuse the improper forum usage, but I would like an informed
> response.  Its the first evidence I stumbled across on how fast
> element sets are generated.
> How many element sets can SPACECOM ( tracking system ) generate per
> second?  The data below suggests at least 578 per second.  If its
> classified...forget I asked.
> The lower element set is only .001728 of a second newer than the upper
> set.  The inclination differs by .0166 degrees.  The mean motion by a
> pittance of .00004608.  Taken together, it implies the object was making
> serious tracks across the heavens.  A look at the name reveals just how
> close to the truth that is.
> The sets were retrieved from distant separate sites.  Which could be
> another revelation in itself.
> 
> MOLNIYA 1-77 PKM (D)
> 1 20586U 90039D   98218.02957138  .00000042  00000-0  10000-3 0  3225
> 2 20586  65.0091 168.8065 6957126 258.0501  22.4981  1.96438197 59395
> MOLNIYA 1-77 PKM (D)
> 1 20586U 90039D   98218.02957140 +.00000815 +00000-0 +10000-3 0 03237
> 2 20586 065.0257 168.8034 6958959 258.0387 022.5029 01.96433589059396

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Phillip S Clark                                       25 Redfern Avenue
Molniya Space Consultancy                             Whitton
Compiler/Publisher, Worldwide Satellite Launches      Middx   TW4 5NA
                                                      U.K.

Specialist in "space archeology" - the older and more obscure the more 
interesting it is !
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