Re: ST OBS August 7, 2012 (part 2): w/ Briz-M failure

From: C. Bassa (
Date: Wed Aug 08 2012 - 09:53:18 UTC

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    Hi Scott,
    On Wed, Aug 8, 2012 at 4:21 AM, Scott Tilley <> wrote:
    > The following summary of data collected on the Briz-M failure shows
    > three distinct objects.  This may be due to the means of compression
    > used to create the four frame or the s/c may have moved relative to each
    > other since Kevin Fetter's observation early in the night with one being
    > obscured by the others... or...?
    It certainly looks like there are three distinct objects in your
    observation. The four-frame method does have the disadvantage that
    where two trails overlap the data can not be used. Typically though
    the trails don't have the same start and end points, which means that
    short sections can still be used for measuring positions.
    Elements for the 12044 launch are on Space Track now; I've overlaid
    them on your image:
    It looks like you saw 38744, 38745 and 38747. Perhaps 38746 was
    tumbling and too faint to show up. Since Kevin saw two bright and two
    faint objects, the fact that you only see one bright object may
    indicate that 38746 is the last stage which is tumbling.
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