ACS UV Contamination Monitor

Details ACS UV Contamination Monitor ACS UV Contamination Monitor

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop10047g&link_type=abstract

HST Proposal ID #10047

Statistics

Hst Proposal Id #10047

Scientific paper

A standard star field {NGC6681} is observed every three months, alternating between after and before annealing operations, through all the ACS broad band UV filters. NGC6681 hosts several UV spectro - photometric standard stars for which accurate spectra have been {and will continue to be} measured with STIS. Two SBC dark current exposures taken as the last exposure of each SBC sequence. Also, to minimize SBS turn-on/turn-off cycles and in order to check the lab flats for the SBC detector, internal observations using the deuterium lamp with F125LP are being taken inflight, following the UV monitor observations. The internal flats have been taken monthly since SMOV, and the degradation of the lamp has been monitored. The total exposure time to date is 15 hours giving a total of 8600 counts/pixel. The goal is 10, 000 counts/pixel such that the resulting pipeline flat has uncertainties of 1% due to poisson counting statistics. Thus, approximately 3 additional hours of observation are required.

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