We present HST/WFPC2 observations of UGC 4483 , an irregular galaxy in the M81/NGC 2403 complex .
Stellar photometry was carried out with HSTphot , and is complete to V \simeq 26.0 and I \simeq 24.7 .
We measure the red giant branch tip at I = 23.56 \pm 0.10 and calculated a distance modulus of \mu _ { 0 } = 27.53 \pm 0.12 ( corresponding to a distance of 3.2 \pm 0.2 Mpc ) , placing UGC 4483 within the NGC 2403 subgroup .
We were able to measure properties of a previously-known young star cluster in UGC 4483 , finding integrated magnitudes of V = 18.66 \pm 0.21 and I = 18.54 \pm 0.10 for the stellar contribution ( integrated light minus H \alpha and [ OIII ] contribution ) , corresponding to an age of \sim 10 - 15 Myr and initial mass of \sim 10 ^ { 4 } M _ { \odot } .
This is consistent with the properties of the cluster ’ s brightest stars , which were resolved in the data for the first time .
Finally , a numerical analysis of the galaxy ’ s stellar content yields a roughly constant star formation rate of 1.3 \times 10 ^ { -3 } M _ { \odot } yr ^ { -1 } and mean metallicity of [ \hbox { Fe / H } ] = -1.3 dex from 15 Gyr ago to the present .