Proposal 11913-IR Filter Wedge Check

Astronomy and Astrophysics – Astronomy

Scientific paper

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Wfc3, Wide Field Camera 3

Scientific paper

Variations in the thickness of a filter alter the path of the incoming light beam, causing an apparent displacement of the observed sources. Proposal 11913 was designed to verify the coplanarity of the WFC3/ IR filters, i.e. whether any of them was wedged, and if so, to evaluate the impact on the astrometry. We found that, with the exception of the F098M and F126N filters, the positions of stars observed through different filters, without moving the telescope, differ on average by less then 0.14 ±0.06 pixels and match the CEI specifications. In addition we found that the positional shifts increase along the X-axis and decrease along the Y-axis as a function of wavelength. The observed shifts are consistent with the fact that the refractive corrector plate (RCP) is tilted ~8.6 degree to the center of the field center chief ray.

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