This is a sources sought notice, not a request for quotes, for a specific PlaneWave™ Instruments CDK20 20” Optical Tube Assembly and associated equipment. The Space Science Program requires an optical telescope with a 20-inch minimum clear aperture, a Dall-Kirkham optical design, and compatibility with a Paramount MEII mount. The telescope must also be compatible with a ZWO ASI461MM Pro camera, Shelyak LHIRES III Spectrograph, and specific OpTec accessories. No submission timelines, budget amounts, or performance location are specified in the description. The opportunity is for market research to identify potential suppliers for this specialized equipment.