.. index:: Completeness and purity calibration (CPC) .. _char-targets-cpc: **CHAR-TARGET-004:** Completeness and Purity Calibration (CPC) ============================================================== .. include:: definitions.rst Parent requirement ------------------ | `R-CAL-B-NS-4100 `_ | `R-CAL-B-NS-4200 `_ | `R-CAL-B-NS-4300 `_ | `R-CAL-B-NS-4400 `_ Objective --------- Generate a spectroscopic sub-sample of at least 120,000 galaxies with 99% purity. The galaxies must be selected with the same selection criteria as in the wide survey. Estimates of the number density of galaxies imply a survey area of at least 40 square degrees. Observations ------------ The completeness and purity calibration (CPC) is obtained from the EDF-N and the EDF-S, together totaling 43 square deg. The main objective is to observe these field with sufficiently many orientations such that the slitless spectra can be optimally decontaminated. Each field requires 10 visits that have their own reference angle depending on scheduling, with a minimum separation angle of 5 degrees. In addition, the K-sequence introduces 4 different angles. The CPC observations are executed with the four red grisms over the full area, and cover at least :math:`3\times3` fields with the blue grism during PV phase. Methodology / Uplink procedure ------------------------------ :command:`Entity`: VIS and NISP :command:`Commanding Method`: :command:`Dither Sequence`: ROS Targets and pointing constraints -------------------------------- .. csv-table:: **CPC fields.** :download:`CSV file ` :file: tables/targets-block-cpc-fields.dat Instrument configuration ------------------------ Instrument: Wide survey Inter-operability constraints ----------------------------- None Dependencies ------------ Fulfilling ---------- Fulfilled by ------------ :ref:`calobs-block-f-cpc-fields` Time-critical ------------- No. Validation ---------- Recovery -------- In-orbit duration ----------------- Processing time --------------- Processing input ---------------- :command:`Ground Processing Input Data`: :command:`Data Description`: Data volume ----------- Processing tools ---------------- Processing element ------------------ DataModel: ``_ Quality control parameters -------------------------- DataModel: ``_ Required accuracy, constraints ------------------------------ Processing method ----------------- Processing output ----------------- Contact person -------------- Calibration Lead Status ------ |today| - In progress. FLAG ---- Priority -------- Observation record ------------------ Comments -------- .. raw:: latex \clearpage