Rapid Pinhole Growth in the F160BW Filter

Details Rapid Pinhole Growth in the F160BW Filter Rapid Pinhole Growth in the F160BW Filter

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfpc.rept....1b&link_type=abstract

Instrument Science Report WFPC2 2009-001, 6 pages

Other

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2

Scientific paper

The WFPC2 Filter F160BW, also known as WOOD's filter, was designed to transmit UV emission around 150nm and strongly block all other wavelengths. The filter has a unique construction where a thin film of sodium metal serves as the spectral element. However, sodium is a highly unstable and reactive metal, which makes the filter susceptible to changes over time. Herein we report a rapidly growing pinhole in the filter located in the field of view of the WF2 CCD. Observers requiring a high rejection of out-of-band light (i.e. red leak) should take note of this feature, and avoid the affected region in the field-of-view.

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