Hi All,
We have just had a great pass over Sharjah – 32 degrees maximum elevation with 106 frames received and decoded using a AMSAT-UK Turnstile with a FUNcube Dongle and the Nayif Dashboard. We were at ground level standing in a University car-park.
A quick analysis, based on the doppler curve shown on the Dashboard and the Nova predictions using the latest TLEs, suggests that the spacecraft is presently approx 40-45 seconds ahead of the TLE predictions. Whether this is a”fixed offset” or whether this difference will change each day remains to be seen.
Have fun
73
Graham & Wouter in Sharjah
Hi Graham, You are correct same observation over India during the 05:22 UTC pass, nice decode of the telemetry. 73 Nitin [VU3TYG]
From: Graham Shirville g.shirville@btinternet.com To: AMSAT BB amsat-bb@amsat.org Cc: operations@funcube.org.uk Sent: Friday, 17 February 2017 12:46 PM Subject: [amsat-bb] Nayif-1 orbit update
Hi All,
We have just had a great pass over Sharjah – 32 degrees maximum elevation with 106 frames received and decoded using a AMSAT-UK Turnstile with a FUNcube Dongle and the Nayif Dashboard. We were at ground level standing in a University car-park.
A quick analysis, based on the doppler curve shown on the Dashboard and the Nova predictions using the latest TLEs, suggests that the spacecraft is presently approx 40-45 seconds ahead of the TLE predictions. Whether this is a”fixed offset” or whether this difference will change each day remains to be seen.
Have fun
73
Graham & Wouter in Sharjah
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As things de-orbit, they actually appear to "speed up". So yes, it will arrive earlier and earlier.
Reason is that "slowing down" due to drag only makes the orbit lower. And lower means the orbit is smaller, and smaller means it gets to the same point sooner. Hence, it appears "faster" in time, but only because it is lower...
Something like that... Bob
-----Original Message-----
A quick analysis, based on the doppler curve shown on the Dashboard and the Nova predictions using the latest TLEs, suggests that the spacecraft is presently approx 40-45 seconds ahead of the TLE predictions. Whether this is a”fixed offset” or whether this difference will change each day remains to be seen.
participants (3)
-
Graham Shirville -
Nitin Muttin -
Robert Bruninga