- Alternative names
- 754 YE
- Named after
- Charles Yerkes
- Organization
- Yerkes Future Foundation
- Location
- Williams Bay , Walworth County , Wisconsin
- Altitude
- 334 m (1,096 ft)
- Website
- yerkesobservatory.org
- Architect
- Henry Ives Cobb
- 40 inch 102 cm
- 40-inch (102 cm) refractor , Dedicated 1897
- 24 inch 61 cm
- Cassegrain reflector , Boller & Chivens
- 10 inch 25 cm
- Cassegrain reflector
- 7 inch 18 cm
- Schmidt camera
- 12 inch
- Kenwood Refractor ( former )