Date: Fri, 29 Mar 2024 01:34:31 -0400 (EDT)
Message-ID: <2049209875.2334.1711690471800@ploutercf.stsci.edu>
Subject: Exported From Confluence
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A detailed analysis of the astrometry of PanSTARRS images near t=
he North Pole shows that a relatively small number of skycells suffered fro=
m poor cross-registration in the original processing. Cross-registrat=
ion issues can result in poor stacking of images, faulty measurements (magn=
itudes too faint, source extent and shape inaccurate, cross-filter misregis=
tration), and generally poor depth and quality for mean and stack objects.&=
nbsp; We have reviewed and quantified the cross-registration for all skycel=
ls North of +70 in the three deeper bands, g, r, and i, and identified ques=
tionable skycells via the internal positional dispersion of mean objects wi=
th at least five detections (in a given band). The plots below show t=
he distribution of skycells with at least 5%, 10%, or 20% of mean objects w=
ith an internal scatter exceeding 1.5 pixels, shown in orange, red, and pur=
ple, respectively.
The affected skycells are listed in this Table of bad skycells.
Sources in areas marked as orange, red, or purple in the above plots hav=
e been set to invalid. However, images of these regions may still be =
usable for limited, non-quantitative purposes, and are available to users -=
but should be used with care.
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