  We have monitored the quasi-persistent neutron-star X-ray transient MXB
1659-29 in quiescence using Chandra. The purpose of our observations was to
monitor the quiescent behavior of the source after its last prolonged outburst
episode and to study the cooling curve of the neutron star in this system. We
discuss the results obtained and how they constrain the properties of the
neutron star in MXB 1659-29
