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19 April 2024 |
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Cleaning the USNO-B Catalog through automatic detection of optical artifact | | Jonathan T. Barron
; Christopher Stumm
; David W. Hogg
; Dustin Lang
; Sam Rowei
; | | Date: |
14 Sep 2007 | | Abstract: | The USNO-B Catalog of astrometric standards contains spurious entries that
are caused by diffraction spikes and circular reflection halos around bright
stars in the original imaging data. These spurious entries appear in the
Catalog as if they were real stars; they are confusing for some scientific
tasks. The spurious entries can be identified by simple computer vision
techniques because they produce repeatable patterns on the sky. Some techniques
employed here are variants of the Hough transform, one of which is sensitive to
(two-dimensional) overdensities of faint stars in thin right-angle cross
patterns centered on bright ($<13 mag$) stars, and one of which is sensitive
to thin annular overdensities centered on very bright ($<7 mag$) stars. After
enforcing conservative statistical requirements on spurious-entry
identifications, we find that of the 1,042,618,261 entries in the USNO-B
Catalog, 24,148,382 of them (2.3 percent) are identified as spurious by
diffraction-spike criteria and 196,133 (0.02 percent) are identified as
spurious by reflection-halo criteria. Surprisingly, the spurious entries are
often detected in more than 2 bands and are not overwhelmingly outliers in any
photometric properties; they therefore cannot be rejected easily on other
grounds, i.e., without the use of computer vision techniques. We return to the
community in electronic form a table of spurious entries in the Catalog. | | Source: | arXiv, 0709.2358 | | Services: | Forum | Review | PDF | Favorites | |
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