Re: SATOBS Site 2751 27 Sep 2005

From: Bruce MacDonald (macdonalddevizes@tiscali.co.uk)
Date: Thu Sep 29 2005 - 03:23:22 EDT

  • Next message: Russell Eberst: "2005SEP28-29.OBS"

    Ted Molczan wrote:
    
    > > All of the USA 129 points are consistently early by ~4.3
    > > seconds; but I was using 5 day-old elsets (Mike's
    > > 05265.83010893) as the wife was using the computer before I
    > > went out. So I *guess* that it has manoeuvred in the last 24
    > > h (even though Pierre's last report stated it was on time).
    > > Another go with Mike's latest elset (05269.83359104 ) gives
    > > me a time error of -0.018 s, which confirms to me that a
    > > manoeuvre has taken place and our group has been onto it.
    >
    > There was no manoeuvre, only a modest (approx 20 percent) variation in the
    rate
    > of decay. For this object, a 25 percent uncertainty in the rate of decay
    results
    > in about 4 s prediction time uncertainty after 5 days.
    >
    
    
    Thanks Ted, I should have realised that with this object the rate of decay
    would be fast.
    
    Best wishes
    
    Bruce
    
    Bruce MacDonald
    COSPAR Site 2751
    Devizes, Wiltshire, UK
    51.3440 N 1.9849 W 125m (WGS84)
    
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