475 Ocllo is a large Mars-crossing asteroid. It was discovered by American astronomer DeLisle Stewart on August 14, 1901, and was assigned a provisional name of 1901 HN.

Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave a light curve with a period of 7.3151 ± 0.0002 hours and a brightness variation of 0.66 ± 0.04 in magnitude.

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