Long-term trends in the NICMOS Camera 2 obscuration pattern and aberrations

Details Long-term trends in the NICMOS Camera 2 obscuration pattern and aberrations Long-term trends in the NICMOS Camera 2 obscuration pattern and aberrations

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nicm.rept...11k&link_type=abstract

Instrument Science Report NICMOS 99-011, 9 pages

Other

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

Scientific paper

Phase retrieval measurements of well-exposed NICMOS Camera 2 star images show that long-term changes occurred in coma and the cold mask position over the 1997-1998 lifespan of the instrument. These caused time-dependent variations in the PSF diffraction pattern, notably the shape of the Airy rings and the positions of bands in the diffraction spikes. These effects are evident in both direct and coronagraphic images when two observed PSFs obtained at different times are subtracted from each other. The derived trends have been implemented in Version 5 of Tiny Tim. PSF monitoring programs for NICMOS after the cryocooler is in place should include similar exposures so that any further cold mask shifting can be tracked.

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