urn:nasa:pds:context:instrument:ctio-cerro_tololo.smarts_1m0.fruttispec 1.4 1.25.0.0 Product_Context urn:nasa:pds:context:instrument:ctio.smarts1m0.fruttispec 2026-07-07 1.4 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.3 Adding missing "facility" references. Adding missing "telescope" references. 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. 2021-12-07 1.0 per RMS, deprecated ctio in favor of ctio-cerro_tololo urn:nasa:pds:context:telescope:ctio-cerro_tololo.smarts_1m0 instrument_to_telescope urn:nasa:pds:context:facility:observatory.ctio-cerro_tololo instrument_to_facility CTIO 1.0m 2DFrutti Spectrograph Spectrometer The Boller & Chivens fast uv-transmitting image tube spectrograph was used at the f/10 focus of the 1.0m telescope. Plate Scale (at f/10 focal plane) 19.5 arcsec/mm Slit Length 19mm mm, 370 arcsec Collimator Focal Length 900 mm Point source collimated beam diameter 90 mm Collimator-to-Camera Angle 49 degrees Grating size 128[INVALID_PDS_CHARACTER]102 mm Camera Focal Length 140 mm Demagnification 6.455 Plate Scale (at detector) 125 arcsec/mm The 2D-Frutti was a two-dimensional photon counting detector, originally developed by Steve Shectman then of the Mt Wilson and Las Campanas Observatories. The sensitivity of this detector is determined by the S-20 photocathode of the Carnegie image tube which provides the first intensification stage. This peaks at ~ 4200A, declining slowly toward the red, so that 7300A can be taken as its red limit. In the UV, the 2D-Frutti was sensitive down to the atmospheric cutoff (3200A). The 2D-Frutti offered a format up to 1.5-M pixels, zero readout noise, and low dark current ( < 1 count/pixel/hour for 1x1 binning). Conversely the 2D-Frutti could be irreversibly damaged by over illumination and count rates must be further limited to typically < 1 cts/pixel/second, because of coincidence losses. Even with these precautions, the 2D-Frutti was not really all that linear.