[amsat-bb] Re: [sarex] Last chances to hear ARISSat-1 are rapidly approaching.
th.frey at vtxmail.ch
Sun Nov 27 09:23:42 PST 2011
Alan P. Biddle schrieb:
> A reminder that if you have been putting off working through the ARISSat-1
> repeater, receiving SSTV pictures, or submitting telemetry, the next few
> weeks will be your last opportunity to be a part of this satellite's
> history. Since deployment in August, ARISSat-1 has descended about 60 km,
> and is currently losing more than 1.5 km per day. The rapid rate is
> partially the result of the recent solar activity on the atmosphere,
> significantly increasing the drag. The predictions by several individuals
> and groups are all converging toward a reentry in January or February, 2012.
> Heating will become significant before then. Remember, good telemetry in
> this period provides invaluable information to the engineering team, to be
> used in future projects.
> The orbit period changes about 30 seconds per day, and that will increase
> steadily. Be certain to update your tracking program Keps from Space-Track
> or CelesTrak before each pass. They issue revised versions 3-5 times daily.
> As the descent continues, this will become even more critical to copying the
> telemetry beacon, especially unattended.
With the program SatEvo by Alan Pickup I calculated the re-entry date
December 27 2011 with Kepler data
1 37772U 98067CK 11331.09098689 .00238223 00000-0 11065-2 0 3555
2 37772 051.6354 054.9663 0005738 050.5984 016.1987 15.82161046 18004
I also calculated an apogee hight of 328 km and a perigee hight of
Mit freundlichen Grüssen, Regards, 73
Thomas Frey, HB9SKA
Thomas Frey, Holzgasse 2, CH-5242 Birr, Tel. + Fax: 056 444 93 41
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