Re: notice on space track site about SGP4.

From: John A. Dormer 2 via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 12 Nov 2020 00:22:33 -0600
I actually have some of his code from 2004. This is the archive listing:

Archive:  sgp4c.zip
   Length      Date    Time    Name
---------  ---------- -----   ----
     17293  08-09-2004 14:47   SGP4EXT.CPP
      5760  10-07-2004 09:51   SGP4TEST.CPP
     86783  08-10-2004 09:37   SGP4UNIT.CPP
      2905  08-09-2004 14:47   SGP4EXT.H
      5607  08-10-2004 07:58   SGP4UNIT.H
     13896  07-08-2004 12:56   SGP4-ALL.ELM
    359608  07-22-2004 09:30   SGP4TEST.TXT
    359608  10-07-2004 09:52   SGP4TEST.OUT
---------                     -------
    851460                     8 files

Additionally, I have a "fortran data" file from the same time period:

Archive:  fortran-data.zip
   Length      Date    Time    Name
---------  ---------- -----   ----
     14787  05-17-2000 12:19   NUT85.DAT
     34933  11-01-2000 13:15   NUTATION.DAT
       812  10-06-1997 18:29   ATMOSEXP.DAT
     33521  04-03-2003 09:34   TESTASTF.DAT
    101257  04-03-2003 07:10   TESTASTF.TXT
     15075  04-28-1999 13:59   GEOS1.TXT
     69216  01-19-2000 13:17   SENSOR.TXT
     17254  04-28-1999 14:00   GEOS2.TXT
     15075  04-28-1999 14:00   GEOS5.TXT
      1694  06-17-1999 12:00   GEOS2.IN
      1476  04-22-1999 14:12   GEOS1.IN
      2048  04-22-1999 14:12   GEOS5.IN
      7834  10-06-1999 15:33   SGP4-ALL.ELM
      5282  09-22-1998 10:06   Y2K.ELM
       294  09-27-2001 12:43   16609D.ELM
       183  10-06-1998 09:24   20510.ELM
---------                     -------
    320741                     16 files

Who would this help? Can you link me to "some enterprising folks?" :)

     John

On 11/11/2020 23:35, Chris Kuethe wrote:
> Speaking of web archeology, some enterprising folks have attempted to 
> archive all the old versions of vallado's code, with an eye to 
> reconstructing commit histories between versions of the public code 
> drops.
>
> On Wed, Nov 11, 2020, 20:15 John A. Dormer 2 <jad_at_texas.net 
> <mailto:jad_at_texas.net>> wrote:
>
>     I have similar concerns. When I visited the
>     http://www.astrodynamicstandards.org/
>     <http://www.astrodynamicstandards.org/> 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
>     https://web.archive.org/ <https://web.archive.org/> 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.
>
>          John
>
>     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
>     <seesat-l_at_satobs.org <mailto:seesat-l_at_satobs.org>>
>     > wrote:
>     >
>     >> Version 8.0 of the SGP4 propagator is now available for
>     download here:
>     >> https://www.space-track.org/documentation#/sgp4
>     <https://www.space-track.org/documentation#/sgp4> 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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>     >>
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Received on Thu Nov 12 2020 - 00:23:28 UTC

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