Spin vectors in the Koronis family: IV. Lightcurves and analyses for 19 members, and the distribution of a 33-object sample complete to H ≈ 11.3

An observational study of Koronis family members’ spin properties was undertaken with two primary objectives: to reduce selection biases for object rotation period and lightcurve amplitude in the sample of members’ known spin vectors, and to better constrain future modeling of spin properties evolution. Rotation lightcurves of nineteen Koronis family members were observed during a total of 72 apparitions between 2005–2021, combined with additional unpublished data from one earlier apparition, and analyzed together with previously published lightcurves to determine the objects’ sidereal rotation periods, spin vector orientations, and convex model shape solutions. The results complete the sample of determined spin vectors in the Koronis family to H ≈ 11.3 (D ~ 16 km) and include the 33 largest family members. The distributions of rotation rates and pole obliquities in the completed sample will be discussed.