.. index:: external straylight check (VIS and NISP) .. _calobs-block-pv-straylight-external: **CALBLOCK-PV-035:** External straylight check ============================================== .. include:: definitions.rst Observation configuration file ------------------------------ | :download:`ocf_CALBLOCK-PV-035_PART-1.csv ` | :download:`ocf_CALBLOCK-PV-035_PART-2.csv ` | :download:`ocf_CALBLOCK-PV-035_PART-3.csv ` | :download:`ocf_CALBLOCK-PV-035_PART-4.csv ` | :download:`ocf_CALBLOCK-PV-035_PART-5.csv ` Scheduling ---------- Once, during PV phase. In case of failure, repeat at next possible opportunity. Time-critical ------------- Yes. Must be executed as soon as possible in PV (at least part 1). Otherwise, a compliant survey cannot be built in time anymore. Dependencies ------------ None. Objective --------- The objective of these observations is to fine-sample the AA/SAA parameter space to identify a parameter range that offers suitably dark conditions for survey operations. We need to test VIS both in the open and closed shutter position, as well as NISP. The least complicated way of achieving this is through the ROS_D1, for parts 1-3. To save time, for parts 4-5 we observe VIS darks only, and without bright-star check, hence no NISP observations. Observations ------------ .. code-block:: python :caption: **Part 1: Quick AA fine-sampling** SAA = 95 for AA in [-3.7, ..., -2.5] in steps of 0.1: Take ROS_D1 .. code-block:: python :caption: **Part 2: Mapping the borders at AA=7.5, and near AA=-3** for SAA in [90, ..., 120] in steps of 5: for AA = -7.5 and AA in [-3.75, ..., -2.5] in steps of 0.25: Take ROS_D1 .. code-block:: python :caption: **Part 3: Mapping the lowest AA border** for SAA in [90, ..., 120] in steps of 5: for AA in [-8.9, -8.5, -8.0]: Take ROS_D1 .. code-block:: python :caption: **Part 4: Fine-sampling the straylight leak at AA around 90** for AA in [-8.6, -7.1]: for SAA in [87.5, 88.0, 88.5, 89.0, 89.25, 89.5, 89.75, 90.0] and SAA in [90.25, 90.5, 90.75, 91.0, 91.5, 92.0, 92.5]: Take a single 325s VIS dark Repeat the AA=-7.1, SAA=90 position, with the spacecraft rotated 180 degrees around its x-axis (Sun direction). Take a single 325s VIS dark. .. csv-table:: **Part 5: Wide sampling of the good SAA/AA space.** Take a single 325s VIS dark. :download:`CSV file ` :file: tables/targets-straylight-wide.dat Fulfilling ---------- :ref:`char-telescope-straylight-external` Targets and pointing constraints -------------------------------- :command:`Pointing`: AA and SAA constraints are given in the observations. The associated RA/Dec coordinates are time-dependent and will be computed once the observation date has been fixed. Instrument configuration ------------------------ Instrument: Wide survey Methodology / Uplink procedure ------------------------------ :command:`Entity`: NISP, VIS :command:`Commanding Method`: VIS: Science, NISP: Observation :command:`Dither Sequence`: ROS_D1 at every pointing (parts 1-3). Single 325s dark (parts 4-5). Inter-operability constraints ----------------------------- None. In-orbit duration ----------------- :command:`In-orbit Duration`: 38.1 h (193 executions of the ROS_D1) **Part 1:** 3.6 h (11 ROS_D1) **Part 2:** 13.9 h (42 ROS_D1) **Part 3:** 7.0 h (21 ROS_D1) **Part 4:** 6.5 h (31 darks, including a 180 degree slew) **Part 5:** 17.1 h (88 darks) Data volume ----------- **Part 1:** 14333 MB **Part 2:** 54726 MB **Part 3:** 27363 MB **Part 4:** 10013 MB (323 MB per dark) **Part 5:** 28428 MB (323 MB per dark) Processing input ---------------- :command:`Ground Processing Input Data`: 11 and 42 VIS nominal science exposures, VIS 325s darks, NISP images in each filter, and NISP spectra (can be ignored) :command:`Data Description`: Processing method ----------------- After overscan, bias, and gain correction, determine binned 2D straylight maps as in commissioning, for best comparison and merging with existing measurements. Processing output ----------------- A map of background levels in the AA/SAA space, with improved sampling density, building on the commissioning products. Processing tools ---------------- Single-frame processing including overscan, bias, and gain correction as in commissioning, for maximum comparability. Recovery -------- A repetition of the observations is only foreseen in case of a technical issues during the observation sequence. Quality control parameters -------------------------- DataModel: ``_ Contact person -------------- Calibration lead .. raw:: latex \clearpage