Re: notice on space track site about SGP4.

From: John A. Dormer 2 via Seesat-l <>
Date: Wed, 11 Nov 2020 22:15:40 -0600
I have similar concerns. When I visited the site, the banner says that "The 
Public Astrodynamic Algorithm Distribution Site is no longer available." 
While the documentation for the APIs appears to be included with the 
distribution package, it's now a bit more closed than it used to be.

The site stopped direct distribution sometime between February and April 
of 2018, so it's been like this for a while. I use to figure this out.

There are other Federal projects which publish tools via Github, but I 
suppose there's some constructive sensitivity to well-understood 
algorithms being published now. I disagree with the current tack which 
Space-Track seems to have taken.


On 11/11/2020 21:18, Chris Kuethe via Seesat-l wrote:
> This is their binary build for x86 and x86_64 windows and Linux. No source
> code for the propagator, but it does have bindings and examples for various
> languages.
> I'm going to try to avoid using it in my workflows because I don't want to
> be "contaminated" by export controlled technical information, nor to become
> dependent on binaries that I can't fix. At least with source code I can try
> fix it when an OS upgrade breaks stuff (I'm lookin' at you Ubuntu 20.10 and
> passivedns...)
> It is awfully tempting to try side by side test between public libraries
> (vallado, python-sgp4, etc.) and space-track.
> On Wed, Nov 11, 2020, 15:15 Kevin Fetter via Seesat-l <>
> wrote:
>> Version 8.0 of the SGP4 propagator is now available for download here:
>> Space Operations Command
>> highly recommends that you update your software to the latest version.
>> Please check the release notes in the Documentation folder of the package
>> for details.
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Received on Wed Nov 11 2020 - 22:16:27 UTC

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