Named in honor of Guido and Oscar Pizarro, who operate the 1-m Schmidt telescope and who exposed the plates on which this minor planet was discovered. For almost 20 years the two brothers have been renowned for their patient and effective work with the telescope. They took the plates for the ESO sky surveys and have taken several thousand plates for general programs, including many specifically for the detection and follow-up of comets and minor planets. (M 17658) _ _.