Abstract
ABSTRACT We describe here the Stellar Photometry Software (SPS) that we have developed at Boston University and the University of Hawaii. SPS combines in a single program procedures for locating stars, computing a mean stellar point-spread function (PSF), and performing aperture and/or multiple PSF-fitting photometry, along with related bookkeeping functions. The software can be run either interactively or in batch mode on computers using the UNIX operating system. The performance of SPS is compared to that of the photometry programs DoPHOT and IRAF/DAOPHOT using both real and simulated CCD observations. A direct comparison of the instrumental magnitudes shows that all three programs produce comparable results.
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