<CoverPageProperties xmlns="http://schemas.microsoft.com/office/2006/coverPageProps"><PublishDate/><Abstract>This document describes the Palomar Observatory DBSP guider control software.  The DBSP instrument is a dual channel spectrograph that simultaneously measures spectra in both the blue and red portions of the visible spectrum using two separate cameras equipped with science grade CCD detectors.  Although the Hale 200” telescope is extraordinarily stable, the long exposure times required for slit based spectroscopy require active guide control of the telescope.  Guiding is accomplished using the Palomar Auto-guider developed by Martin Shepherd, which acquires images using a Xybion camera fed by a fiber optic lens system attached to an XY stage.  The fiber optic guide camera head is mounted on an XY stage to allow astronomical objects within an extended area (5.6x14.2 arc minutes) adjacent to the slit to be used as guide stars.  The current Palomar Auto-guider is nearing the end of its useful life and the failure of a critical component that supported the offset guiding forced the development of replacement software for some of the systems core functions.  This document describes the software for responsible for controlling the XY offset guider stage and presenting users with a catalog of guide star objects.  
</Abstract><CompanyAddress>Caltech Optical Observatories, Palomar Observatory
1200 East California Blvd, Pasadena California 91125</CompanyAddress><CompanyPhone/><CompanyFax/><CompanyEmail/></CoverPageProperties>