Spin vectors in the Koronis family: V. Resolving the ambiguous rotation period of (3032) Evans.

A sidereal rotation counting approach is demonstrated by resolving an ambiguity in the synodic rotation period of Koronis family member (3032) Evans, whose rotation lightcurves' features did not easily distinguish between doubly- and quadruply-periodic. It confirms that Evans's spin rate does not exceed the rubble-pile spin barrier and thus presents no inconsistency with being a ∼ 14-km reaccumulated object. The full spin vector solution for Evans is comparable to those for the known prograde low-obliquity comparably-fast rotators in the Koronis family, consistent with having been spun up by YORP thermal radiation torques. • Case study analysis using lightcurve epochs to resolve an ambiguous rotation period. • Sidereal rotation counting identifies the alias period even for symmetric lightcurves. • Spin rate of (3032) Evans does not exceed the rubble-pile spin barrier. • Spin vector of Evans is consistent with spin-up by YORP thermal radiation torques. [ABSTRACT FROM AUTHOR]