  The intra-night trajectories of asteroids can be approximated by straight
lines, and so are their intra-night detections. Therefore, the Hough transform,
a line detecting algorithm, can be used to connect the line-up detections to
find asteroids. We applied this algorithm to a high-cadence Pan-STARRS 1 (PS1)
observation, which was originally designed to collect asteroid light curves for
rotation period measurements (Chang et al., 2019). The algorithm recovered most
of the known asteroids in the observing fields and, moreover, discovered 3574
new asteroids with magnitude mainly of 21.5 < w_p1 < 22.5 mag. This magnitude
range is equivalent to sub-kilometer main-belt asteroids (MBAs), which usually
lack of rotation period measurements due to their faintness. Using the light
curves of the 3574 new asteroids, we obtained 122 reliable rotation periods, of
which 13 are super-fast rotators (SRFs; i.e., rotation period of < 2 hr). The
required cohesion to survive these SFRs range from tens to thousands of Pa, a
value consistent with the known SFRs and the regolith on the Moon and Mars. The
higher chance of discovering SFRs here suggests that sub-kilometer MBAs
probably harbor more SFRs.
