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Accurate distances are fundamental to interpreting many measured propertiesof galaxies. Surprisingly, many of the best-studied spiral galaxies in theLocal Volume have distance uncertainties that are much larger than can beachieved with modern observations. Using Hubble Space Telescope opticalimaging, we use the tip of the red giant branch method to measure the distancesto six galaxies that are included in the Spitzer Infrared Nearby GalaxiesSurvey (SINGS) program and its offspring surveys. The sample includes M63, M74,NGC 1291, NGC 4559, NGC 4625, and NGC 5398. We compare our results withdistances reported to these galaxies based on a variety of methods. Dependingon the technique, there can be a wide range in published distances,particularly from the Tully-Fisher relation. In addition, differences betweenthe Planetary Nebula Luminosity Function and Surface Brightness Fluctuationtechniques can vary between galaxies suggesting inaccuracies that cannot beexplained by systematics in the calibrations. Our distances improve uponprevious results as we use a well-calibrated, stable distance indicator,precision photometry in an optimally selected field of view, and a BayesianMaximum Likelihood technique that reduces measurement uncertainties.

Accurate Distances to Important Spiral Galaxies: M63, M74, NGC 1291, NGC 4559, NGC 4625, NGC 5398