Yerkes Observatory
| Title | Yerkes Observatory |
| View | Drawing, Orbit of Planet X 1 |
| Series | II: Buildings and Grounds |
| Description | Drawing (photograph copy) of Planet X's orbit by Yerkes Observatory astronomer William D. MacMillan. Lowell Observatory astronomers believe X is a comet rather than a planet because of its elliptical orbit. |
| Subject Terms | MacMillan, William Duncan, 1871-1948 | Lowell Observatory | Drawings (Visual works) | Planets | Comets | Elliptical orbits |
| Photograph Date | Undated |
| Physical Format | Photographic prints; 18.5 x 23.3 cm |
| Artist | MacMillan William Duncan, 1871-1948 |
| Collection | Archival Photographic Files |
| Repository | University of Chicago Library, Special Collections Research Center |
| Image Identifier | apf2-08753 |
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