.. index:: Contamination scan .. _calobs-block-f-contaminationscan: **CALBLOCK-F-014:** Contamination scan ====================================== .. include:: definitions.rst Observation configuration file ------------------------------ :download:`ocf_CALBLOCK-F-014_1ROS.csv ` :download:`ocf_CALBLOCK-F-014_2ROS.csv ` :download:`ocf_CALBLOCK-F-014_3ROS.csv ` Scheduling ---------- **PV phase:** Execute twice in the first two weeks of PV phase. Separation to the :ref:`calobs-block-pv-selfcal` visits should be at least two days. This is to get better sampling of potentially fast photometric oscillations due to ice contamination. **Routine phase:** Approximately weekly, **at least as long as** :ref:`calobs-block-f-phase-diversity` is active. Scheduling must not disturb any thermal stabilisation periods. This block is thus best executed immediately before a thermal stabilisation period, or after the end of a finished PDC block. In case of failure, skip and continue with the plan. Time-critical ------------- Yes. Must not disturb thermal stabilization period. Dependencies ------------ None Objective --------- The :ref:`PDC ` campaign is susceptible to contamination, and a higher cadence than the monthly :ref:`self-cal visits ` is required. These observations provide a quick photometric monitoring of sources in the self-cal field. Observations ------------ Execute a single ROS at the center of the self-cal field. Fulfilling ---------- | :ref:`calobs-vis-psfcalibration` Targets and pointing constraints -------------------------------- :command:`Pointing`: No angle constraints .. csv-table:: **Self-cal field** :download:`CSV file ` :file: tables/targets-selfcal-center.dat Instrument configuration ------------------------ Instrument: Wide survey Methodology / Uplink procedure ------------------------------ :command:`Entity`: VIS & NISP :command:`Commanding Method`: NISP: Observation, VIS: Science :command:`Dither Sequence`: ROS Inter-operability constraints ----------------------------- None In-orbit duration ----------------- :command:`In-orbit Duration`: 1.2 h Data volume ----------- ``1*ROS = 4981 MB`` Processing input ---------------- :command:`Ground Processing Input Data`: All calibration products to run the standard science pipeline :command:`Data Description`: Each visit provides a single set of ROS data, like for one wide survey field. Processing output ----------------- Mean flux loss in VIS and NISP images, computed over all sources in the field-of-view, compared to previous Self-cal visits (long-term photometric monitoring). Required accuracy, constraints ------------------------------ Images successfully acquired Processing tools ---------------- Full SGS processing as for any wide survey field. It is not necessary to run OU-SIR, but might be easier to just do it. Quality control parameters -------------------------- DataModel: ``_ Contact person -------------- Calibration Lead .. raw:: latex \clearpage