Re: notice on space track site about SGP4.

From: Chris Kuethe via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 11 Nov 2020 22:41:04 -0800
These are the two top results in my email.

https://github.com/poliastro/vallado-software/issues/1
https://github.com/rirze/sgp4-cpp

On Wed, Nov 11, 2020, 22:22 John A. Dormer 2 <jad_at_texas.net> wrote:

> 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> wrote:
>
>> I have similar concerns. When I visited the
>> 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/ 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>
>> > wrote:
>> >
>> >> Version 8.0 of the SGP4 propagator is now available for download here:
>> >> 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.
>> >> _______________________________________________
>> >> Seesat-l mailing list
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>> >>
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>
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Received on Thu Nov 12 2020 - 00:42:13 UTC

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