urn:nasa:pds:context:instrument:mcdonald.struve2m1.cs 1.3 1.25.0.0 Product_Context 2026-07-07 1.3 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.2 Updated schema version. Adding missing "facility" references. Adding missing "telescope" references. 2025-01-02 1.1 Updated schema version. Adding missing "telescope" references. 2023-01-31 1.0 Initial export from OLAF urn:nasa:pds:context:telescope:mcdonald.struve2m1 instrument_to_telescope urn:nasa:pds:context:facility:observatory.mcdonald instrument_to_facility Cassegrain Spectrometer Spectrometer The Cassegrain Spectrometer is a telescope-based instrument that analyzes the light from distant celestial objects by dispersing it into its component wavelengths. It provides spectral data critical for studying the composition, velocity, and other characteristics of stars, galaxies, and nebulae.