You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 2 Next »

Date

Attendees

Acronyms

  • TA = target acquisition
  • TSO = time-series observations
  • FoV = field of view

Discussion items

TimeItemWhoNotes
General UpdateKevin
  • 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
    

Action items

  •  
  • No labels