  We present HST photometry of the LSB galaxy UGC 5889 and derive its recent
star formation history. In the last 200 Myr the star formation proceeded in
modest bursts at a rate of the order of e-2 to e-3 solar masses masses per
year, with periods of extremely low SFR or even quiescence. The rate derived
from the present study for the last 20 Myr is in agreement with the Halpha
emission from the galaxy. The presence of a consistent population older than
200 Myr is suggested by the data. However, observational errors and
completeness correction prevent any firm conclusion on the oldest age. The
total mass of stars is of the order of 5.5e7 solas masses. Even if the recent
episodes of star formation have heated the gas and carved a hole in the disk,
blow-away of the gas is unlikely to occur.
