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Instanttrack Altitude?

Looking at the latest re-entry plot, why does Instantrack show
an altitude that is 10km below the official prediction?  This is
using an EPOC TLE of 26 November, Instantrack shows 239.5 km
Avaerage altitude.  What do other programs show?



> -----Original Message-----
> From: aprssig-bounces@lists.tapr.org 
> [mailto:aprssig-bounces@lists.tapr.org] On Behalf Of Robert
> Sent: Tuesday, November 27, 2007 1:09 PM
> To: aprssig@lists.tapr.org
> Subject: [aprssig] ANDE -APRS Re-Entry Campaign
> ANDE-APRS Re-Entry Campaign:
> The ANDE-MAA satellite (Nav Oscar - 61) will de-orbit in the
> next few weeks but is fully operational.  We encourage
> because while it is in use (2m packet up/down), then it is
> and sending telemetry.  We want to capture the most telemetry
> see if we can catch the thermal changes as re-entry
> Who can capture the last telemetry frame?
> The most important telemetry is that which is fed live by
> into the APRS-IS system.  Because that is automatically logged
> and time stamped.
> You can verify your data got in by looking at the
> http://pcsat.aprs.org web page after each pass.
> If you manually capture any packets, Please take special care
> accurately LOG the TIME of any packets received especially in
> the final day prior to re-entry.  See the contest page below
> how to submit entries:
> Here is the ANDE Operations web page.  It has links to live
> telemetry too:
> http://www.ew.usna.edu/~bruninga/ande-ops.html
> And this one is the CONTEST for data collection and operations
> sponsored by PA3GUO and DK3WN:
> http://www.ande-deorbit.com
> Any APRS station that is also on the internet can contribute
> telemetry by simply QSY'ing their normal APRS rig receiver to
> 145.825 on that final day.
> If you do not normally run APRS or an IGate, then you can
> download ALOGGER.EXE which is a full up IGate designed just
> satelite gating without having to learn APRS.  See Bill's web
> page:
> http://www.billdiaz.dynip.com/ASatLogger.htm
> ANDE is coming over the northern latitudes in the afternoons
> evenings local sun time, but this pattern moves earlier by 14
> minutes per day.
> Just monitor 145.825 MHz.
> Enjoy!
> Bob, WB4APR
> _______________________________________________
> aprssig mailing list
> aprssig@lists.tapr.org
> https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig

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