5min | General Update | Kevin | - See slides titled ""
- TA was recently brought up as a concern for TSOs of bright targets and how STScI would handle proposals/targets for which TA was not feasible
- WG performed study of TA limits for all four instruments
- NIRISS: no concerns, can always perform TA on science target
- NIRCam: can achieve 0.1 pixel pointing accuracy with 4 partially and 1 fully saturated pixels (K = 6.1), brighter objects may need to use offset TA or saturate additional pixels with a decrease in pointing accuracy (~1 pixel)
- NIRSpec: most objects will need to use offset TA, but brightness range is 11 < K < 25 therefore finding a suitable offset target should not be an issue
- MIRI LRS: no concerns with LRS mode, can always perform TA on science target
- MIRI Photometry: no TA for MIRI photometry, blind pointing accuracy (4 pixels at 1 sigma) is well within FoV for smallest subarray (SUB64)
- Conclusion from TA study is that all science targets should have a viable means to perform TA
- Potential improvements for Cycle 2
- Narrow filter for NIRCam, fewer groups for NIRSpec, improved TA on saturated targets (software), micro-shutter assembly TA for NIRSpec
- Other highlights include...
- MIRI TSO photometry enabled for Cycle 1, includes full array and all subarray modes
- Developed strategy to provide timestamps for each integration since time is recorded once every science (full frame) image, will create FITS extension with BJD_TDB times
- Finalized "chunking" strategy for large datasets, exposures will be evenly divided into segments of <= 2 GB each; will enable faster processing of data and easier sharing on MAST
- Everyone should update their local version of PandExo
|