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We report on the detection of Cepheids and the first distance measurement tothe spiral galaxy NGC 1326-A, a member of the Fornax cluster of galaxies. Wehave employed data obtained with the Wide Field and Planetary Camera 2 on boardthe Hubble Space Telescope. Over a 49 day interval, a total of twelve V-band(F555W) and eight I-band (F814W) epochs of observation were obtained. Twophotometric reduction packages, ALLFRAME and DoPHOT, have been employed toobtain photometry measures from the three Wide Field CCDs. Variability analysisyields a total of 17 Cepheids in common with both photometry datasets, withperiods ranging between 10 and 50 days. Of these 14 Cepheids with high-qualitylightcurves are used to fit the V and I period-luminosity relations and deriveapparent distance moduli, assuming a Large Magellanic Cloud distance modulus(m-M) (LMC) = 18.50 +- 0.10 mag and color excess E(B-V) = 0.10 mag. AssumingA(V)/E(V-I) = 2.45, the DoPHOT data yield a true distance modulus to NGC 1326-Aof (m-M)_0 = 31.36 +- 0.17 (random) +- 0.13 (systematic) mag, corresponding toa distance of 18.7 \pm 1.5 (random) \pm 1.2 (systematic) Mpc. The deriveddistance to NGC 1326-A is in good agreement with the distance derivedpreviously to NGC 1365, another spiral galaxy member of the Fornax cluster.However the distances to both galaxies are significantly lower than to NGC1425, a third Cepheid calibrator in the outer parts of the cluster.

TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XXII. The Discovery of Cepheids in NGC 1326A