Difference: 20152710MSciPhotometryLab2 (6 vs. 7)

Revision 727 Oct 2015 - DavidHadden

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META TOPICPARENT name="StewartBoogertPhotometry2015"
Initial Investigations
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In the first image, a full comparison of the 1 hour exposures for different angles are seen, and within many bright patches are seen in identical pixel positions for both. Although they are hard to see looking at a static image, so a zoomed in region is shown below, showing an almost identical, intensely triggered group of pixels in the same position. Many of these are seen, and are now shown without a doubt to be due to faults in the CCD chip, although it is not currently understood whether or not this is a prominent affect for stellar observations.

Another feature no longer seen is the streaks seen before, which is perhaps because they are very infrequent events, which are covered up by the background for exposures of this magnitude. This would perhaps point to them being random cosmic rays, or radiative decays, which strike the CCD chip at random positions, so do not create a large effect for longer exposures.

 -- DavidHadden - 27 Oct 2015

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