A SEARCH FOR SLOW-MOVING OBJECTS AND THE LUMINOSITY FUNCTION OF THE KUIPER BELT

We describe the detection of two slow-moving objects in a survey cover ing 0.7 degrees sq, of the ecliptic to a limiting magnitude m(R)=23.5. The objects are probable members of the Kuiper belt. Assuming that th ey travel in circular orbits and have geometric albedo 0.03, their hel iocentric distances are 43.3 and 35.2 AU and their radii are 150 and 1 25 km, respectively, Existing surveys for slow-moving objects, combine d with the plausible assumption that the Kuiper belt is the source of Jupiter-family comets, constrain the Kuiper belt luminosity function A T(<H), where H is the absolute magnitude. The slope p=d log(10) N/dH i s near 0.1 at H-R congruent to 9, which is shallower than for asteroid s or comets. There is evidence for a bright-end cutoff near H-R simila r or equal to 7 and the slope also appears to steepen for H-R greater than or similar to 12. (C) 1995 American Astronomical Society.