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Re: Preliminary AO-40 Keps -- Post Burn #1
For 34:47:27 N / 86:44:04 W / 300 m, was able to start discerning a
signal about 9:30:00 UTC, which could be identified as the beacon by
1 deg of elevation as predicted by Instant Track (AOS @ 09:13 UTC,
1 deg @ 09:31) . For the same element set, SatTrack 3.1.6 on FreeBSD 4
gives different results:
N4CNW SatTrack V3.1 Orbit Prediction
Satellite #26609 : AO-40
Data File : tlex.dat
Element Set Number: 6 (Orbit 52)
Element Set Epoch : 11Dec00 16:06:54.144 UTC (0.8 days ago)
Orbit Geometry : 614.13 km x 49163.67 km at 6.403 deg
Propagation Model : TLE Mean
Ground Station : Monrovia, AL, USA --- EM64PS
Time Zone : CST (-6.00 h)
Date (CST) Time (CST) of Duration Azimuth at Peak Vis
Orbit
AOS MEL LOS of Pass AOS MEL LOS Elev
Tue 12Dec00 03:58:34 12:16:05 16:24:51 12:26:16 99 182 122 54.1* VDD
54
73
Mike N4CNW
On Tuesday 12 December 2000 03:08, Viktor Kudielka wrote:
> Ken Ernandes wrote:
> > Thus tracking reports
> > with station WGS-84 lat/lon/alt and times of AOS/LOS versus *these*
> > estimated Keps would be helpful.
> >
> > AO-40
> > 1 26609U 00072B 00346.67146000 .00000000 00000-0 00000-0 0 68
> > 2 26609 6.4028 239.1973 7763693 192.2448 0.1497 1.57068165 527
>
> Hi Ken,
>
> For 48°14.382 N / 16°19.236E / 275 m
> TLE #6 predicts AOS on 2000-12-12 at 08:02:30 UT.
> AOS observed: 08:00 UT, weak signals S1 to S3 (versus S9++ all the
> previous days)
> Marginal telemetry decoding (more than 50% CRC errors average)
> At 08:45 UT actual antenna direction 250°/0° (versus 215°/19° predicted)
> S2 beacon not heard (probably due to uncertain antenna direction ?,
> AO-40 behind the Vienna woods ?)
> LOS around 08:48 UT (TLE #6 LOS predicted: 16:02 UT)
> At 09:00 UT again signals from 270°/0°.
> The orbital plane has obviously changed quite a lot.
>
> Vy 73, Viktor, OE1VKW
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