19918 1977 PB is a main-belt asteroid with an estimated diameter of about 15 km. It was discovered on August 6, 1977 by C. I. Lagerkvist at Mount Stromlo. The semi-major axis is 2.65 AU, the eccentricity is 0.133 and the inclination is 13.54 degrees.
This asteroid was observed on 3 nights during April and May 2015. A period of 7.6897 hours was derived with a large amplitude.