urn:nasa:pds:context:instrument:irtf-maunakea.3m2.spex 1.4 1.25.0.0 Product_Context urn:nasa:pds:context:instrument:telescope.spex.irtf3m0 2026-07-07 1.4 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.3 Updated schema version. Adding missing "facility" references. Adding missing "telescope" references. 2025-01-02 1.2 Updated schema version. Adding missing "telescope" references. 2023-10-12 1.1 SBN/PSI: updated the first sentence in the Description 2021-12-07 1.0 per RMS, deprecated irtf (and ancient telescope.INST.irtf) with irtf-maunakea urn:nasa:pds:context:telescope:irtf-maunakea.3m2 instrument_to_telescope urn:nasa:pds:context:facility:observatory.irtf-maunakea instrument_to_facility 10.1117/12.551107 Rayner, J.T., P. M. Onaka, M. C. Cushing and W. D. Vacca, Four Years of Good SpeX, in Ground-based Instrumentation for Astronomy, A. F. M. Moorwood and M. Iye, Eds., Proceedings of the SPIE, vol. 5492, pp. 1498-1509, 2004, doi:10.1117/12.551107. 10.1086/367745 Rayner, J. T., D. W. Toomey, P. M. Onaka, A. J. Denault, W. E. Stahlberger, and 3 others, SpeX: A Medium-Resolution 0.8 - 5.5 micron Spectrograph and Imager for the NASA Infrared Telescope Facility, PASP 115, 362, 2003, doi:10.1086/367745. SpeX Spectrometer SpeX is a medium-resolution spectrograph, operational since May 2000 at the NASA Infrared Telescope Facility on Mauna Kea. It underwent an upgrade in 2014 to replace outdated electronics and enhance its capabilities, including increased wavelength coverage and improved spectral sensitivity. Key changes included replacing old detector arrays with improved models and upgrading most warm electronic hardware. The upgrade, funded by the National Science Foundation, introduced new spectral modes and allowed for more robust instrument control, reducing software issues. The document compares old and new configurations of SpeX, detailing changes in pixel size, slit widths, and spectral ranges. Overall, the upgrade has enhanced SpeX's functionality in astronomical research.