Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3060w&link_type=abstract
HST Proposal ID #3060
Physics
Hst Proposal Id #3060
Scientific paper
The purpose of this calibration test is to provide information on the aberrations of the PC-OTA combination as a function of position in the four PC chips. Earlier exposures of the WF in the crowded cluster NGC 1850 revealed unexpected variations in the PSF over the field. It is now desired to repeat this observation in the PC for similar information. The data are needed to understand and remove the optical aberrations of the PC from data taken to characterize the aberrations of the OTA. As the results may have a large bearing on strategy to measure the OTA aberrations, they should be carried out as soon as possible. Only one series of exposures in a single filter and a single pointing is required. No additional PSF observations are needed.
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