Regarding ISS and the accuracy of the predictions.
The same was noted yesterday at around 14:00 UTC. AOS was about 2.5 min's late and was able to work via the cross band repeater until it was 5 degrees below the horizon!
My Keplerian data and PC clock is up to date, I also suspect that there was an orbit change and the "new" Keplerian data has not been made available yet?
73, Pierre ZS6BB
When the ISS does a reboost (like it did on Jan 14), it is usually a significant change in orbit. The predicts seem to take about 3 days to sync back up (even though they start getting closer about 24 hours later).
Just another one of the challenges of the ISS, they make changes quite a bit so you have to be on top of the daily activity schedule.
Kenneth - N5VHO
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Pierre van Deventer Sent: Friday, January 16, 2009 1:26 AM To: amsat-bb@amsat.org Subject: [amsat-bb] ISS Keplerian elements
Regarding ISS and the accuracy of the predictions.
The same was noted yesterday at around 14:00 UTC. AOS was about 2.5 min's late and was able to work via the cross band repeater until it was 5 degrees below the horizon!
My Keplerian data and PC clock is up to date, I also suspect that there was an orbit change and the "new" Keplerian data has not been made available yet?
73, Pierre ZS6BB
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On Fri, 2009-01-16 at 13:40 -0600, Ransom, Kenneth G. (JSC-OC)[BAR] wrote:
When the ISS does a reboost (like it did on Jan 14), it is usually a significant change in orbit. The predicts seem to take about 3 days to sync back up (even though they start getting closer about 24 hours later).
Just another one of the challenges of the ISS, they make changes quite a bit so you have to be on top of the daily activity schedule.
I see it as one of the advantages of using the Armstrong method for positioning your antenna ;-) If you point the little end at the part of the sky where the bird is loudest, it's in the right place.
Gordon
participants (3)
-
Gordon JC Pearce MM3YEQ -
Pierre van Deventer -
Ransom, Kenneth G. (JSC-OC)[BAR]