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Impact of Simple Dithering on Co-Added Depth

Impact of Simple Dithering on Co-Added Depth. March 10, 2010 Krughoff , Jones, Ivezic , Connolly. Testing Framework. Focal plane: $LSST_SVN/ imsims/raytrace/focalplanelayout.txt Postgres DB with OpSim 1_29 and 3_61 Python code to add dithered centers PGSphere for spherical indexing

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Impact of Simple Dithering on Co-Added Depth

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  1. Impact of Simple Dithering on Co-Added Depth March 10, 2010 Krughoff, Jones, Ivezic, Connolly

  2. Testing Framework • Focal plane: • $LSST_SVN/imsims/raytrace/focalplanelayout.txt • Postgres DB with OpSim 1_29 and 3_61 • Python code to add dithered centers • PGSphere for spherical indexing • Join of OpSim field centers and rotator positions with focal plane layout. • Grid sky and query at each position for observations.

  3. OpSim 1_36 r-band180 < RA < 220; -30 < Dec < 10

  4. Dithering requirements Full field dithering Completely deterministic Preserve same night pair overlap Dithering algorithm: Number nights Number vertices Night number%Max vertex number = Vertex number Apply offset to all OpSim field centers for given night.

  5. Differential and cumulative distributions of 10 year co-added 5 sigma limiting magnitude in r-band. For reference, the SRD value is 27.5.

  6. Visit Histograms

  7. Power spectra for Dithered and Non-Dithered cases. Preliminary

  8. Priorities for Future Work • Further analysis of current dithering scheme • Larger area • Additional metrics • Proposal aware dithering schemes • Different dithering approaches • Include vignetting

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