LRIS Slit Mask Extensions
KOA has incoroporated the LRIS slit mask exensions using Tilsotua: Reproducing Slitmask Sky Positions for use with the LRIS Multislit Archive by Sullivan et. al. This package created by Notre Dame finds the coordinates of the center of the slits from the AUTOSLIT files.
Beginning with observations taken February 11, 2026, the extensions are available in the FITS files as well as extracted IPAC (tab delimted) table files for science and calibration files that have a match on the slitmask name in the archive. The tables are visible from the Raw quicklook link from the search results as well as in the download package data. Note that the extension numbering is different between red (LR), and blue (LB) FITS files.
Extensions Descriptions
| Extension | Description | Blue Side | Red Side |
|---|---|---|---|
| MASKDESIGN | General Design Information Contains the general mask information, such as the mask central coordinates, observing dates, and design software information. |
ext5 | ext2 |
| OBSERVERS | Observer Information Contains contact information regarding the principal investigator of the mask. |
ext6 | ext3 |
| OBJECTCAT | Object Coordinates Contains the coordinates and target types of each slit in the mask. The slit central Right Ascension and Declination are found in the table. |
ext7 | ext4 |
| SLITOBJMAP | Slit Object Map Is an internal table used by the Keck slitmask database to map the target to slit information. |
ext8 | ext5 |
| DESISLITS | Slit Design Information Contains the information about the individual slits. The slit width, length, and position angle are included in the table. |
ext9 | ex6 |
| BLUEPRINT | General Blueprint Information Stores the mask blueprint. The table includes blueprint identification numbers, software versions, and milling status. |
ext10 | ext7 |
| BLUEPRINT_OSERVERS | Blueprint Observer Information This is similar to the OBSERVERS table, but associated to the blueprint instead of the mask as a whole. When a blueprint is used for several masks, the information contained can be different than the OBSERVER table. |
ext11 | ext8 |
| BLUSLITS | Mask Slit Position Contains the X,Y positions of the slit corners in the mask reference frame. The information stored here is used by the mask milling software at Keck to mill the mask. |
ext12 | ext9 |
| MASKBLU | Mask Status and Identification Contains the X,Y positions of the slit corners in the mask reference frame. The information stored here is used by the mask milling software at Keck to mill the mask. |
ext13 | ext10 |
Table Column Descriptions
| Table header functions: Enter text in the box for a string match. Click on the filter icon to enter constraints. | ||||
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Please acknowledge the use of KOA by including this text in your publications:
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