Abstract
We present the first faint, STIS luminosity function (LF) of a dwarf
spheroidal galaxy (dSph), the Ursa Minor (UMi) dSph. We compare its LF to that
of M15 (NGC~7078), a Galactic globular cluster which has a similar age and
metallicity. The two LFs are found to be identical to the completeness limit
of the STIS data, indicating that the initial mass functions of M15 and
the UMi dSph are similar to masses as low as 0.4 solar masses.
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