The dynamical processes that took place during the history of the solar system have shaped 
the statistical properties of the Kuiper belt. In particular measuring the radial 
distribution of the Kuiper belt and its edge has been recognized by several authors as 
beeing particularly important.

We present the advance on the search for Kuiper Belt objects in a couple of dozens Subaru 
fields. Our latest results on the cumulative radial distribution of these objects, with a 
25th magnitude limit are shown. We use the subtraction method, that has been used 
extensively in similar pencil-beam searches. The observations were taken in each field in 
groups of a few, and visited twice a night over 2 nights. We combined the consecutive, 
relatively short exposures (~1 min) and search for moving objects. We finally link 
detections between visits to the same field.

This is part of a longer project aimed at determining the edge of the Kuiper Belt using 
wide-field ground based images. We also have deeper fields that should extend the measured 
distribution to farther, smaller objects. Results for the first of those fields are shown. 
We have automated a large part of the process and this has allowed us to deal with such 
large datasets.