The 10.3 -- cm observation of Sloanaker was made on May 20, 1958, using the 84 -- foot reflector at the Maryland Point Observatory of the U.S. Naval Research Laboratory. The age of the moon was about 2 days. The half-intensity diameter of the main lobe of the antenna was about 18'.5, and the brightness temperature was reduced by assuming a Gaussian shape for the antenna beam and a uniformly bright disk for the moon.