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We present deep HST ACS/WFC photometry of the dwarf irregular galaxy NGC1569, one of the closest and strongest nearby starburst galaxies. These dataallow us, for the first time, to unequivocally detect the tip of the red giantbranch and thereby determine the distance to NGC 1569. We find that this galaxyis 3.36 +/- 0.20 Mpc away, considerably farther away than the typically assumeddistance of 2.2 +/- 0.6 Mpc. Previously thought to be an isolated galaxy due toits shorter distance, our new distance firmly establishes NGC 1569 as a memberof the IC 342 group of galaxies. The higher density environment may helpexplain the starburst nature of NGC 1569, since starbursts are often triggeredby galaxy interactions. On the other hand, the longer distance implies that NGC1569 is an even more extreme starburst galaxy than previously believed.Previous estimates of the rate of star formation for stars younger than ~ 1 Gyrbecome stronger by more than a factor of 2. Stars older than this were notconstrained by previous studies. The dynamical masses of NGC 1569's three superstar clusters, which are already known as some of the most massive everdiscovered, increase by ~53% to 6-7x10^5 solar masses.

A New Hubble Space Telescope Distance to NGC 1569: Starburst Properties and IC 342 Group Membership