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We present here the analysis of about 19,500 new star hours of low eclipticlatitude observations (|b| < 20 deg) obtained by the Hubble Space Telescope'sFGS over a time span of more than nine years; which is an addition to the12,000 star hours previously analyzed by Schlichting et al. (2009). Our searchfor stellar occultations by small Kuiper belt objects (KBOs) yielded one newcandidate event corresponding to a body with a 530 +/-70m radius at a distanceof about 40AU. Using bootstrap simulations, we estimate a probability of approx5%, that this event is due to random statistical fluctuations within the newdata set. Combining this new event with the single KBO occultation reported bySchlichting et al. (2009) we arrive at the following results: 1) The eclipticlatitudes of 6.6 deg and 14.4 deg of the two events are consistent with theobserved inclination distribution of larger, 100km-sized KBOs. 2) Assuming thatsmall, sub-km sized KBOs have the same ecliptic latitude distribution as theirlarger counterparts, we find an ecliptic surface density of KBOs with radiilarger than 250m of N(r>250m) = 1.1^{+1.5}_{-0.7} x 10^7 deg^{-2}; if sub-kmsized KBOs have instead a uniform ecliptic latitude distribution for -20 deg <b< 20 deg then N(r>250m) = 4.4^{+5.8}_{-2.8} x 10^6 deg^{-2}. This is the bestmeasurement of the surface density of sub-km sized KBOs to date. 3) Assumingthe KBO size distribution can be well described by a single power law given byN(>r) \propto r^{1-q}, where N(>r) is the number of KBOs with radii greaterthan r, and q is the power law index, we find q=3.8+/-0.2 for a KBO eclipticlatitude distribution that follows the observed distribution for larger, 100-kmsized KBOs. 4) Regardless of the exact power law, our results suggest thatsmall KBOs are numerous enough to satisfy the required supply rate for theJupiter family comets. (Abridged)

Measuring the Abundance of sub-kilometer sized Kuiper Belt Objects using Stellar Occultations