  We present optical and infrared observations of RPr1, a faint (I = 21.01) and
very red object (I - K = 4.57) discovered in a deep CCD survey, covering an
area of 800 square arcmin of the Praesepe open cluster. A low resolution
spectrum shows that RPr1 is a very late object, the latest object in Praesepe
for which a spectrum has been taken to date. Our estimates give a mass between
0.063 and 0.084 solar masses, and indicate that RPr1 may turn out to be the
first brown dwarf in this cluster.
