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20021020 report
Transit Inclinometry : over and under the pole
Transit Inclinometry was done using pseudo-sources at declinations
of -60o10', as is usual, and, for the first time, at
a declination of +75o30', *below* the (north) pole.
The first measure suggests a transit step size of about 2" (somewhat
less than previous measures), but the second measure suggests a value
more like 8" - see the latest entry in the
archive.
This latter value would seem to be rather in conflict with the decent
transit tracking (of real sources) - such as of Uranus, at an elevation
of approx. 60o, on 23 Apr and
05 Aug, and, in particular, of the northern
source 0133+476 on 26 Sep, where approx.
3" steps should be seen at transit if the modelled step was in such error.
Repeats will be requested, but, as may be imagined, there would be
serious consequences of the
step size varying as a function of elevation and/or direction of motion.
Iain Coulson
Latest Update : 21 Oct 2002
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