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

Asteroid Discovery and Light Curve Extraction Using the Hough Transform -- A Rotation Period Study for Sub-Kilometer Main-Belt Asteroids