Greetings,
Two recent papers concerning the historical and current behavior and operating
aspects of AO-7 were written and published in the AMSAT Journal by the
undersigned. I would recommend those who are interested contact the AMSAT
office, Martha, and get copies of the two articles to
Farrell,
An often used rule-of-thumb in astrodynamics for decay height is about 140
kilometers
which is about 87 miles. A satellite that gets that far into the atmosophere
will burn up during
it's final orbit in short order! I would recommend you just keep trying until
you are sure
the
Greetings,
The decay rate of ARISSat-1 has slowed down from the last decay prediction
I produced on 2011 Dec. 14.
It currently appears that ARISSat-1 (37772) will now decay on 2012 January 3
plus or minus a day. Caveat lector.
Jim, N8OQ
___
Sent
Greetings,
It is time for another decay date prediction update.
As the satellite has gotten lower the atmospheric drag has
increased significantly. This prediction update uses solar data
through 2011 Dec. 14. The fit only includes orbital height
data between Dec. 9 and Dec. 14.
The
Greetings,
Using solar data through 2011 Nov. 30 and updating the decay fit I am getting a
re-entry date of 2012 January 12 with a rule-of-thumb error estimate of +/- 10
days or so for ARRISSat-1 (37772).
Regards,
Jim, N8OQ
___
Sent via
Greetings,
First, thank you Mineo for reading the AMSAT Journal and making several of my
papers available
on your web site.
My AMSAT Journal
paper published in the March/April 2011 issue is actually still fairly valid
for the scenarios shown in the paper. The solar flux has turned out to be
Greetings,
I just got back on the air from my new QTH (FM07uv) and monitored the beacon
with good signals on Sep. 29 from 20:51 to 21:02 UTC. I heard no transponder
activity and no beacon signal on the near zenith pass here on Sep. 30. from
19:51 to 20:05.
Jim, N8OQ
Greetings,
If you were a member of AMSAT-NA you would receive the AMSAT Journal and could
have read the article I wrote for the last issue concerning the predicted
lifetime of ARRISat-1. The paper presented predictions for up to a
maximum release height of 370-km and there is enough
Greetings,
I am looking to obtain good quality telemetry from AO-7's 435.1-MHz RTTY
telemetry event during February and March 2009. I woud appreciate receiving
good quality raw RTTY telemetry. I am especially interested in the time period
before 2009 March 3 and after 2009 March 6. Telemetry
