The distance to NGC 3319 has been determined from Cepheid variable stars as part of the Hubble Space Telescope Key Project on the Extragalactic Distance Scale .
Thirteen and four epochs of observations , using filters F555W ( V ) and F814W ( I ) respectively , were made with the Wide Field Planetary Camera 2 .
Thirty–three Cepheid variables between periods of 8 and 47 days were discovered .
Adopting a Large Magellanic Cloud distance modulus of 18.50 \pm 0.10 mag and extinction of E ( V-I ) =0.13 mag , a true reddening-corrected distance modulus ( based on an analysis employing the ALLFRAME software package ) of 30.78 \pm 0.14 ( random ) \pm 0.10 ( systematic ) mag and the extinction of E ( V - I ) = 0.06 mag were determined for NGC 3319 .
This galaxy is the last galaxy observed for the HST H _ { 0 } Key Project .