GALWORKS Performance on the Spiral-Rich Cluster Hercules

The Hercules cluster is a nearby (z=0.037) spiral-rich galaxy cluster located in a relatively low stellar density region of the sky (glong=31, glat=44). Consequently, it is prime territory to undertake Tully-Fisher study & analysis. It is crucial that GALWORKS extract good photometry on spirals (and otherwise) in clusters like Hercules. This memo describes the performance of GALWORKS on five repeat scans of the Hercules cluster taken on the night of 970521 with the 2MASS 3-channel camera. In addition to photometry, we address issues with regard to reliability, detection repeatibility and tuning parameters.