This series of radar images of the asteroid 4769 Castalia were taken at approximately 2 minute intervals on Aug. 22, 1989, at the Arecibo Observatory. The horizontal axis is Doppler frequency, and the vertical axis is the time the echo was received (delay). These two scales map differently onto distance, which has been approximately compensated by replicating the pixels in the vertical dimension, yielding a resolution of approximately 150 m (horizontal) by 300 m (vertical). The images are fainter at the beginning and the end of the sequence because the antenna gain was a fairly strong function of zenith angle when these images were taken. Each image is the sum of 27 separately reduced (Fourier transformed) data sets, or "looks". The sampling frequency was 16 ms, and there are 64 complex samples in each look, giving a resolution of 0.95 Hz (corresponding 150m), and allowing 27 looks to be summed.