[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Preliminary AO-40 Keps -- Post Burn #1



Sorry chaps

Nothing from Central London today.

Big noise floor and small antennas here.

73 Howard G6LVB


----- Original Message -----
From: "Mike Murphree" <n4cnw@knology.net>
To: "Viktor Kudielka" <viktor.kudielka@ieee.org>; "Ken Ernandes"
<n2wwd@mindspring.com>
Cc: "AMSAT BBS" <amsat-bb@AMSAT.Org>
Sent: Tuesday, December 12, 2000 10:19 AM
Subject: Re: [amsat-bb] 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
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org


----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home