Re: ETS-6 Observation

From: Bjoern Gimle (
Date: Wed Oct 24 2001 - 12:56:37 EDT

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    Thanks for your observation!
    I analyzed your times with my program 'Synodic', and determined the period
    is pretty close to 9.2 s for your entire observation, but the primary
    flashes cease around 11:14:50, and reappear as a new series, 2.2 seconds
    earlier, around 11:15:54. Actually this series had been around nearly from
    the start, but marked by Jim as secondary.
    So it seems that Jim observed both flash events that have been most
    frequently seen in the past, and I will make a new determination of the axis
    (I also found unprocessed observations by Michel Jacquesson in July 2001)
    Most important is to determine start/end of the two bright sequences, and/or
    the time of brightest magnitude, and the phase shift (when they are equal?)
    ----- Original Message -----
    > Thanks to the information provided by Tony Beresford, Bjoern Gimle, and
    > Mike McCants I was able to acquire and time the flashes of ETS-6 from
    > Tucson, AZ this morning.  I was late getting out, and 3rd magnitude
    > flashes were already under way at 11:11:03 UTC.  I used 5x25 binoculars
    > to obtain the data in the table below.  "P" represents a primary flash,
    > and it appears that the interval between flashes was 9.0 seconds at the
    > beginning of the 8 minute observation, and 9.2 seconds at the end.  After
    > several minutes, the primary flashes dimmed to 6th magnitude or less, and
    > they were still visible when I ceased observation.  I hope to make a
    > future observation soon, with better magnitude data.
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