.. index:: Dispersion Solution; Planetary Nebula .. _calobs-nisp-spec-wavelength-dispersion-pn: **CALPRODUCT-NS-008:** NISP-S Wavelength Dispersion with Planetary Nebulae ========================================================================== .. include:: definitions.rst Parent requirement ------------------ | `R-CAL-B-NS-1210 `_ | `R-CAL-B-NS-1221 `_ Scheduling ---------- Once during PV phase. Once during routine phase, after 1 year or later at a time when unallocated time would become large later in the survey. Time-critical ------------- Yes. See dependencies. Dependencies ------------ :ref:`calobs-nisp-spec-wavelength-transfer` Objective --------- Observe a compact planetary nebula (PN) with strong emission lines as a function of position for each NISP detector, to obtain the wavelength dispersion solution. The dispersion solution is transfered to the Self-cal field to establish a set of standards that can be used to monitor for drifts. The Self-cal must be observed immediately after (or before) the PN observations, without grism wheel movements in between. Fulfilled by ------------ :ref:`calobs-block-pv-nisp-wavelength-dispersion` :ref:`calobs-block-f-nisp-wavelength-dispersion` Data volume ----------- NISP-S: ``(80*2*5 + 9*2*5)*NS = 145070 MB`` for the PN and Self-cal NISP-S exposures NISP-P: ``3*4*4*NP = 4224 MB`` for the astrometric NISP-P exposures VIS: ``16*VS = 7232 MB`` for the VIS astrometric exposures Processing input ---------------- :command:`Ground Processing Input Data`: All calibration products to run the standard science pipeline (BPM, darks, flat, nonlinearity etc), ground-based dispersion data/model. :command:`Data Description`: NISP: 320 spectro-MACC images (5*16*4), 162 photo-MACC images (144 for the 2x2 grid, and a total of 18 for the first and last dither position), VIS: 320 images (5*16*4) Processing output ----------------- Dispersion solution as a function of detector position for all detectors and all grisms. Required accuracy, constraints ------------------------------ Emission line centroids successfully extracted from all PN measurements Processing tools ---------------- L1 science pipeline and line measurement pipeline (?), additional offline trend analysis of dispersion combined with ground data/model Quality control parameters -------------------------- DataModel: ``_ Contact person -------------- NISP-S calibration scientist .. raw:: latex \clearpage