MSA Operability Monitor
Abstract
Internal lamp observations during slews will be used to monitor the status of NIRSpec MSA failed shutters to update MSA failed shutter masks. Undispersed MSA images will be taken through the ALLOPEN, ALLCLOSED, CHKBD1x1-1, and CHKBD1x1-2 shutter patterns, using NRSIRS2RAPID readout, with 7 groups x 1 integration. These exposures will be acquired every two weeks to monitor the failed open and closed shutters on the NIRSpec MSA. The CHKBD3x3-1 shutter pattern will be observed to check shutter image location on the detector against the instrument model, and is also useful for grating wheel sensor calibration. An additional long exposure (65 groups x 1 integration,949 s, 1506 s with overhead) through the ALLCLOSED configuration is obtained once per year, to yield a high dynamic-range contrast map.
This calibration program is provisional and may change in response to system developments and final science program.- Publication:
-
JWST Proposal. Cycle 1
- Pub Date:
- October 2019
- Bibcode:
- 2019jwst.prop.1488O