APT Changes Anticipated for APT 2020.2 release in March 2020

APT version 2020.1.1, to be released in January 2020 in conjunction with the JWST cycle 1 call for proposals, can be used for preliminary planning of proposals. However, a number of updates are being planned for APT 2020.2, which will be released on or around March 5, 2020.

APT version 2020.2 must be used to submit all proposals for JWST Cycle 1 (the deadline is May 1, 2020). This is because APT 2020.2 will include additional timing model changes, and will be the official accounting tool for Cycle 1.

Changes anticipated in APT 2020.2 are listed below so users can determine if any significant changes are anticipated that would affect their science proposal strategy:

  • Updates to the moving target timing model;
  • Further possible updates to science instrument timing models (e.g., a change in MIRI target acquisition (TA) overhead due to a reduction in the size of the TA subarray);
    • All known timing updates as of December 2019 (except the moving target timing model) will be in APT 2020.1.1. However, additional timing updates may be added—any such updates will be included in APT 2020.2;
  • NIRISS filter-dependent dithering specifications;
  • new apertures for specifying post-small angle maneuver (SAM) exposures for NIRCam coronagraphy;
  • Removal of science time from the TAC version of the PDF attachment. (Science exposure times and the total times including overheads are provided in APT as a reference for the proposer community.  However, STScI does not want this level of detail to be provided to the TAC panels, so science time will be removed from the version of the PDF that goes to to the TAC.)



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