Thanks for the answers guys. I was using what I assume are current keps. I was using Orbitron and the tracking segment of Ham Radio Deluxe. What I did notice is that the position seemed accurate until docking, then the difference became noticeable as Alan had described in his message. Again, not a major issue, just curious as to what was happening. For Alan, WB5RMG, wouldn't the subsequently released keps bring the ISS position into line? I imagine so, I think the programs were using keps from Celestrak, AMSAT, or Space Track.

Thanks!

Scott/WB2UZR

On Tue, Nov 18, 2008 at 3:09 AM, Armando Mercado am25544@triton.net wrote:

Hi Scott,

Do the keps for the shuttle become in accurate at some point during a

...

docking mission?

From launch to docking to the ISS, the shuttle does several engine burns. See the following URL:

http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/...

Armando, N8IGJ