All data from LCO imagers are processed by the BANZAI pipeline, which uses SEP to determine the sources in the images. Information on the extracted sources is stored in a file's catalog (CAT) extension. Descriptions of the catalog keywords are provided below. Details for some keywords are available in the SEP documentation.
| Keyword | Format | Unit | Description | Comment |
|---|---|---|---|---|
| x | float | pixel | X coordinate of source | |
| y | float | pixel | Y coordinate of source | |
| xwin | float | pixel | Windowed x coordinate of source | |
| ywin | float | pixel | Windowed y coordinate of source | |
| xpeak | int | pixel | X coordinate of peak | |
| ypeak | int | pixel | Y coordinate of peak | |
| flux | float | count | Flux within Kron-like elliptical aperture | |
| fluxerr | float | count | Error in flux | Summed over all pixels in aperture |
| peak | float | count | Flux at xpeak, ypeak | |
| fluxaper1 | float | count | Flux in 1" aperture | Circular aperture with 1" diameter |
| fluxerr1 | float | count | Error in fluxaper1 | |
| fluxaper2 | float | count | Flux in 2" aperture | Circular aperture with 2" diameter |
| fluxerr2 | float | count | Error in fluxaper2 | |
| fluxaper3 | float | count | Flux in 3" aperture | Circular aperture with 3" diameter |
| fluxerr3 | float | count | Error in fluxaper3 | |
| fluxaper4 | float | count | Flux in 4" aperture | Circular aperture with 4" diameter |
| fluxerr4 | float | count | Error in fluxaper4 | |
| fluxaper5 | float | count | Flux in 5" aperture | Circular aperture with 5" diameter |
| fluxerr5 | float | count | Error in fluxaper5 | |
| fluxaper6 | float | count | Flux in 6" aperture | Circular aperture with 6" diameter |
| fluxerr6 | float | count | Error in fluxaper6 | |
| background | float | count | Average background value within the aperture | |
| fwhm | float | pixel | Full Width at Half Maximum | |
| fwtm | float | pixel | Full Width at Tenth Maximum | |
| a | float | pixel | Semi-major axis of source | |
| b | float | pixel | Semi-minor axis of source | |
| theta | float | degree | Position angle of source | |
| kronrad | float | pixel | Kron radius used for extraction | |
| ellipticity | float | Ellipticity | ||
| fluxrad25 | float | pixel | Radius containing 25% of flux | |
| fluxrad50 | float | pixel | Radius containing 50% of flux | |
| fluxrad75 | float | pixel | Radius containing 75% of flux | |
| x2 | float | pixel^2 | Variance on x coordinate | |
| y2 | float | pixel^2 | Variance on y coordinate | |
| xy | float | pixel^2 | XY covariance | |
| flag | int | Bit mask of extraction and photometry flags | Sources with extraction flags > 8 are excluded from catalog | |