Uploaded image for project: 'Data Management'
  1. Data Management
  2. DM-5306

PcaPsfDeterminer is overly aggressive in rejecting stars

    Details

    • Templates:
    • Team:
      Data Release Production

      Description

      In debugging DM-4692, we found that PcaPsfDeterminer was very aggressive in rejecting outliers from individual principal components, which lead to unconstrained solutions in large regions of particular images (validation_data_cfht visit 849375 ccd 22 is a good example). This also caused significant changes in the PSF model when small numbers of psf candidate stars were added or dropped from the input catalog. We believe this behavior lead to ~10 milimag variations in PSF photometry. We were able to reduce this sensitivity by setting an ad-hoc work around configuration of spatialReject=6.0, but we did not study this in depth.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                Unassigned
                Reporter:
                ctslater Colin Slater
                Watchers:
                Colin Slater, John Swinbank, Robert Lupton, Russell Owen, Simon Krughoff
              • Votes:
                0 Vote for this issue
                Watchers:
                5 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:

                  Summary Panel