RE: Potential Problems with Meade Software for Satellite Tracking

From: Walter Ridgewell (
Date: Tue Mar 31 2009 - 02:59:42 UTC

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    Not sure which telescope model you have Bjorn, but does not the Autostar
    Update software provided with you scope still allow for the uploading of
    elements to the handset? The version I have for my ETX-70 (v4.3) allows for
    updating satellites, comets, asteroids ect.
    Walter Ridgewell,   I.S.P *
    *Information Systems Professional
    > -----Original Message-----
    > From: Björn (Large mails) Gimle []
    > Sent: March 30, 2009 1:22 AM
    > To: Robert Herrick;
    > Subject: Re: Potential Problems with Meade Software for Satellite
    > Tracking
    > I agree (with the worst scenario)!
    > I have made dozens of test runs with both LEO,HEO and GEO, and
    > comparing
    > displayed positions to output from reliable prediction programs.
    > At first reading the display, later with an ASCOM program designed to
    > log
    > time and position when pressing SPACE on a connected PC.
    > In all cases position errors were 1-5 degrees.
    > Your theory appears correct - it could also explain my suspicion that
    > it
    > doesn't correct for Earth rotation - noticable if the satellite is
    > considerably early or late.
    > (Which was my primary reason for buying a scope with tracking!)
    > I gave up trying after several firmware upgrades didn't correct the
    > problem.
    > Now I use Boshart's SatTrack  (LXSAT) that tracks high objects OK, but
    > I'm
    > not yet convinced about early-late sats.
    > It would be nice though to be able to upload elsets into the Autostar,
    > to be
    > usable for a few days, and not having to expose the laptop to dew and
    > cold.
    > /Björn
    > ----- Original Message -----
    > > Has anyone noticed how the Meade software does not track geosats? It
    > > point where it thinks the geosat is, based on the TLE, then moves
    > East
    > > (and down) as time advances, as if there is a time term missing that
    > > should be correcting the position to stay where it it. ...
    > > Second, does the error start when the calculations are first made or
    > > when the telescope is first pointed? Both of these problems impact
    > not
    > > only tracking geosats but probably LEOs as well.
    > -----------------------------------------------------------------------
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