We carried out a search procedure to ascertain the exact size and shape of the TAAS field of view as seen from EXES. We selected the largest aperture opening available to us on TAAS, 5 mm, and positioned it at various points where we saw the TAAS aperture clipped in the FOV. Each exposure was saved as an image file, which we later compiled into one image. The resulting image is shown here, along with a dotted line showing the observed position of the s/d/f wheel aperture. The observed FOV did not appear to be perfectly round, nor did the bootstrapped TAAS boresight center position (the dim white circle near the center of the image) correspond to neither the center of the FOV nor center of the s/d/f/ aperture (the overlaid red dot). We will continue to investigate why these patterns are non-concentric.
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Since this was posted, Al Howard has e-mailed a message indicating that the 'Aligned2' position setting for the FCLS is not the 'HIPO Bootstrapped' telescope center as we had thought. Not sure what it actually is...Al says it's 'actually the position from using the alignment fixture', which might mean it's the central optical axis of the TAAS. Or not. I've emailed Al to follow up....
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