.. index:: PSF model (NISP); Calibration observations .. _calobs-nisp-phot-psfmodel: **CALPRODUCT-NP-007:** NISP-P PSF Model ======================================= .. include:: definitions.rst Parent requirement ------------------ Not in the `CalCD-B `_ Scheduling ---------- Monthly. Time-critical ------------- No. Objective --------- Calibrate / validate the NISP PSF Model. The position of brighter NISP sources must be known with an accuracy smaller than 0.1 pixel. This requires a PSF model that is robust against undersampling and e.g. intra-pixel sensitivity variations. In the Self-cal field with its stellar density of about :math:`2\;{\rm arcmin^{-2}}`, a single NISP detector will see about 200 stars in the range 16-21 AB mag in a single exposure, or 12000 stars after 60 dithers, per filter. Currently, there are no formalized requirements on a NISP PSF model. It is assumed that 12000 stars per detector are sufficient. Fulfilled by ------------ :ref:`calobs-block-pv-selfcal` :ref:`calobs-block-f-selfcal` Data volume ----------- NISP: ``24720 MB = (3*NP+NS)*60`` Processing input ---------------- :command:`Ground Processing Input Data`: All calibration products to run the standard science pipeline (BPM, darks, flat, nonlinearity etc), small scale flat fields :command:`Data Description`: NISP: 240 MACC images (60 spectro, 180 photo MACC images) Processing output ----------------- Updated NISP PSF model, for each filter Required accuracy, constraints ------------------------------ Images successfully acquired Processing tools ---------------- TBD Quality control parameters -------------------------- DataModel: ``_ Contact person -------------- NISP-P calibration scientist Observation record ------------------ .. raw:: latex \clearpage .. raw:: latex \clearpage