Left: fractional linear polarization p vs. α for (12) Victoria obtained on UT 2021 September 14−17 with Lick 3 m POLISH2. The polarization phase curve varies both from nightly changes in α (blue points) and from intrinsic rotational variations across the asteroid’s surface (red points). Right: (12) Victoria observations phased to the 8.66 hr rotation period of the asteroid. Observations made at overlapping rotational phases are used to subtract polarization variations due to phase-angle changes and uncover variations intrinsic to the asteroid (red points).