[amsat-bb] Gold Standard for Keplerian Data

[Thomas Doyle]

Steve,

There is only one gold source for kep data.

 https://www.space-track.org/auth/login

Every other kep source is subject to being old as they get their data
from space-track every so often.

It is very easy to access this data directly. If you really care try either
of these methods.

http://www.tomdoyle.org/TleTools/TleToolsBasic.html

http://www.celestrak.com/SpaceTrack/TLERetriever3Help.asp

I do not know how they obtain the kep data for the AMSAT web site but I
would guess they use the AMSAT list and as a result their data is often old.

It has always been a mystery to me why more people do not go directly to
the source of TLE data. Perhaps it is a just a case of "BUT WE HAVE ALWAYS
DONE IT THAT WAY - SO THERE !".

73 W9KE Tom Doyle




On Sun, Nov 23, 2014 at 10:04 AM, Steve May <steve.w5iem at gmail.com> wrote:

> I have noticed that when I update the Keplerian Data for my location on
> SatPC32 and generate a list of passes they all seem to be about 5 minutes
> different than the predictions from the AMSAT website. This is for the
> earliest pass, and I am using the exact GPS coordinates for my location.
>
> So which do I rely on? Which predictions should I consider the "gold
> standard" for passes?
>
> Steve, W5IEM
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-- 

Sent from my computer.

tom ...