Measuring the Cold Mask Offset

Details Measuring the Cold Mask Offset Measuring the Cold Mask Offset

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nicm.rept....4r&link_type=abstract

Instrument Science Report NICMOS 2003-004, 4 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

An unexpected increase in measured thermal background during the Cycle 11 early calibration program caused speculation that the cold mask position could have shifted since Cycle 7. To address this concern, a single orbit NICMOS program was executed (Program ID: 9704) to obtain deep PSF images of the star LHS1846 in all three cameras. Analysis of this data using the Phase Retrieval software package revealed a minimal amount of cold mask shift since Cycle 7 and provided new, more accurate cold mask values for the Tiny Tim PSF modeling software. It was concluded that the cold mask position was not the cause of increased thermal background observed during the Cycle 11 early calibration program. Increased thermal background has since been determined to be the result of increased thermal load on the HST aft shroud due to the addition of ACS and NCS during SM3b.

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