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Element(ary) analysis revisited



I have done further checking  and these elements DO
agree BACK ON DEC. 11 to the accuracy reported
by observers.  I would now say there is little evidence
of a propulsive event of a large magnitude between
then and now.  The error bounds back on the 11-th,
and in set #8 could easily mask any propulsive
event of smaller magnitude.   It is only natural that
over time, the disparity between them would
grow as the error in set #8 compounded itself.

It is good that NORAD continues to paint the bird and
about the right place.

Bob




----- Original Message -----
From: "Ken Ernandes" <n2wwd@mindspring.com>
To: "AMSAT BBS" <amsat-bb@AMSAT.Org>
Sent: Wednesday, December 20, 2000 1:16 PM
Subject: [amsat-bb] Updated AO-40 Keplerian elements from NORAD Data


> NORAD / Space Command determined an accurate set of Keplerian elements for
> AMSAT OSCAR 40 using tracking data from their radars at Eglin AFB, FL and
> the Kwajalein atoll.  The tracking data has good time and geometric
> dispersion, yielding high quality Keplerian elements.  Thus the following
> Keps supersede previous estimates:
>
> AO-40
> 1 26609U 00072B   00354.78150463  .00000000  00000-0  00000-0 0   124
> 2 26609   6.2479 237.0656 8128421 195.4843  97.8395  1.26834511   611
>
> Satellite: AO-40
> Catalog number: 26609
> Epoch time:      00354.78150463
> Element set:      12
> Inclination:        6.2479 deg
> RA of node:       237.0656 deg
> Eccentricity:    0.8128421
> Arg of perigee:   195.4843 deg
> Mean anomaly:      97.8395 deg
> Mean motion:    1.26834511 rev/day
> Decay rate:    0.00000e+00 rev/day^2
> Epoch rev:              61
> Checksum:              275
>
> 73, Ken Ernandes, N2WWD
> n2wwd@amsat.org
>
>
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