NICMOS Coronagraphic Imaging Strategy

Details NICMOS Coronagraphic Imaging Strategy NICMOS Coronagraphic Imaging Strategy

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nicm.rept....6s&link_type=abstract

Instrument Science Report NICMOS-99-006, 41 pages

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

Scientific paper

A set of NICMOS Camera 2 coronagraphic data (SMOV program ID: 7052) are available for use as reference images. The data were obtained to measure the diffractive energy rejection and scattering properties of the coronagraph. The calibration star BD+032964 (G2V) was observed on 1997 July 23 and was stepped at 0.0185 and 0.3 arcsecond steps across the coronagraphic hole in both the image x- and y-axis directions. In addition, observations were obtained at two different S/C roll angles. Subtraction of the images indicates the necessity for positional accuracy of targets to better than 1/8 pixel (~0.009 arcseconds) for PSF subtraction. In addition, a review of coronagraphic observations was performed for program 7227 (GTO/NIC) for which the telescope was rolled in the same orbit. We conclude the best strategy for PSF subtraction for objects close to a bright source (<1.125 arcsec) is to observe the same target in the same orbit with a roll of the spacecraft between observations. This procedure will work if the telescope attitude history is favorable. Rolling the telescope in consecutive orbits will otherwise give equivalent results, and gives as good results if you are looking for extended object or point sources relatively far from the primary source.

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