Re: DMB Obs Aug 14-15

From: Paul Gabriel (
Date: Wed Aug 16 2000 - 11:34:18 PDT

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    reference multiple points for one sat, I too had the same questions,
    what I now do and what others do is to have a stopwatch that records
    memory splits, you set up on a known position and wait for the sat, record
    the split and then trak the sat across the sky and record splits where it appears
    you have a good reference between two stars or a transit, you then go back to a chart
    after observation and determine the locations of the other points.  some of us
    use tape recorders to record relative star reference info on the splits as they are happening.
    this seems to work very well as long as you are set up correctly on your
    first point, after the fact you can determine then if the sat was early or late
    and the location of your other points.  I rarely try for more than 3 per 
    sat as I do not see the point in that and it just makes for more work, while
    others seem to see the value in the more accurate points the better, or that is my 
    understanding.  some of the OD analysts say they only need one accurate point
    to update an elset, I try for 2 or 3 if I can get them to double check my accuracy
    and consistency.
    *********** REPLY SEPARATOR  ***********
    On 08/16/00 at 13:11 Wayne Hughes wrote:
    >Thanks for the explanation of your post.  I have two questions whose answers may
    >be involved.
    >First, what is the history of your choice of these four Noss satellites?  I
    >haven't looked at your other posts in view of this but I assume they are also
    >observations of the same satellites?
    >Second, I see six observations for the first object:
    >> IntlId SiteYYMMDDHHMMSSss  Sss  TCHHMMmm   DDMMm   Mm E
    >> 8401204267500081422175832  010  12173764  +48324   2  5
    >> 8401203267500081422181718  010  12173604  +48495   2  5
    >> 8401206267500081422190931  010  12202443  +68212   15 5
    >> 8401203267500081422203486  010  12013070  +66068   15 5
    >> 8401201267500081422295428  010  12163423  +57481   3  5
    >> 8401201267500081422300646  010  12164100  +62180   1  5
    >So the observations, presumably of the minutest positions of the object, are 19,
    >52, 85, 20, and 12 seconds apart.   Not to mention of course that your next set
    >of observations starts 5 minutes later.   How do you physically get this many
    >observations?  Do you have a single skychart printed out with landmarks already
    >planned for marking the positions?  You have a stopwatch, the chart and a pen, a
    >light, and a set of binocs, at least.    Do you have three arms?  :-)
    >How on earth do you get all this on the night in the light of a full moon?
    >Wayne Hughes
    >33.860N, 83.242W, 229m
    >Wolfskin District, Arnoldsville GA USA
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    Paul Gabriel
    26.24310N 098.21635W 33m (the stars at night are big & bright......)
    titan / win95C / Calypso
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