Computer Science – Performance
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996nicm.rept...19c&link_type=abstract
Instrument Science Report NICMOS-019, 5 pages
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
The analysis of NICMOS data obtained during the System Level Thermal Vacuum Test in August 1996 has yielded some information on the sensitivity of the NICMOS detectors to cosmic ray hits. The number of cosmic ray events (5 s detections) during the experiments was 0.067 events/Camera/sec in NIC3, 0.095 events/Camera/sec in NIC2, and 0.090 events/Camera/sec in NIC1, with an increase of 35-40% from NIC3 to NIC1/NIC2. We tentatively attribute this increase to secondary emission from the aluminum surrounding the detectors. The mean size of the 5 s cosmic ray hits is 1.65 pixels, with no significant variations from one Camera to the other. The number of affected pixels decreases for increasing DN values. If the on-orbit performance mirrors this situation, information in the affected pixels may be recovered in some cases with an appropriate use of the MULTIACCUM readout mode.
Calzetti Daniela
Skinner Chris
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