| Minorplanet: | yes |
| Background: |
|
| 475 Ocllo | |
| Discovery Ref: | http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html |
| Discovered: | 14 August 1901 |
| Mpc Name: | (475) Ocllo |
| Alt Names: | 1901 HN; 1959 JS; 1979 DD |
| Orbit Ref: | [1] |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 2.59436AU |
| Perihelion: | 1.60661AU |
| Aphelion: | 3.5821abbr=onNaNabbr=on |
| Eccentricity: | 0.38073 |
| Period: | 4.18 yr (1526.3 d) |
| Inclination: | 18.926° |
| Asc Node: | 34.496° |
| Dimensions: | 11–25 km |
| Mass: | 3.1? kg |
| Density: | 2.0? g/cm3 |
| Rotation: | 7.3151abbr=onNaNabbr=on |
| Abs Magnitude: | 11.88 |
| Arg Peri: | 305.68° |
| Mean Motion: | / day |
| Observation Arc: | 97.47 yr (35601 d) |
| Uncertainty: | 0 |
| Moid: | 0.670978AU |
| Mars Moid: | 0.3173AU |
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.