Re: Why a fixed Bstar?

Bjoern Gimle@tt-tech.se (Gimle@tt-tech.se")
Fri, 18 Apr 1997 12:49:32 +0200

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Jim Varney wrote:

>Why does ndot/2 vary from .00000000 to .00000056 but bstar is fixed at
10000-3?
>SDP4 uses the bstar drag term -- so why doesn't vary like ndot/s does?
>
For objects where SDP4 is the model to be used (P>225 min.) ndot/2 is
a pseudo-drag term generated to approximate (for a short term) most of
the the perturbations modelled by SDP4, so SGP4/SGP programs can give
reasonable predictions.

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