Re: 88-18A geoflasher results

From: Tony Beresford (
Date: Sun Apr 28 2002 - 01:26:52 EDT

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    At 23:55 27/04/02, Kevin Fetter wrote:
    >You must have a stop watch that measures time in 1/1000 sec. My watch only measures at 1/100 sec. As for my timing accuracy, its 40/100 second or 0.4 seconds. That's 0.2 seconds to star the watch and 0.2 seconds to stop the watch. How good can you measure time to.
    Kevin, my stopwatch reads to 1/100 second. I utilize its laptime storage
    capability(50) to store a time on each occasion I see a flash, having started it
    on a known minute. Thus the consistency of the reaction time is important,
    for the period measurement, not its absolute value. I entered the cycle
    number and flash time into an Excel spreadsheet, and fitted a staight
    line for the cycle number vs Time. The slope of this line is the
    best estimate of the period. Whats more EXCEL gives me a formal standard
    deviation of the slope ( and the period), and residual plots.
    The SD for most days was .003 or .004 seconds. The difference of the observed
    times and the fitted times was always equal to or better than 0.2 seconds,
    with quite a few .05 secs or better. 
    This technique is of course quite time consuming and only applicable
    to slow moving satellites like 88-18A.
    Tony Beresford
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