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V.C. Ponce (UVa), N.A. Sharp (NOAO)
RR Lyrae variable star V789 Cyg is known to have an incorrect period listed in the GCVS, based on photographic data from 1958 (Vatican Variable 45). We present a well-determined light curve based on CCD data taken in 1998 at the Kitt Peak 0.9m and 2.1m telescopes, during the National Science Foundation's Research Experience for Undergraduates program, and reduced during the 2000 REU program. The new period is 5.38 hours. In addition, spectroscopic data from the KPNO Coudé Feed telescope provide a modern radial velocity.