The Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) satellite is a strategic climate continuity mission that will answer new and emerging advanced science questions related to Earth’s changing climate. These science goals are accomplished via PACE’s main optical instrument, a sophisticated spectrograph, the Ocean Color Instrument (OCI) consisting of UV/VIS and VIS/NIR channels each complete with a dichroic, grating, and detector. We will overview the characterization methods used for each component, with respect to its metrology targets, and further discuss how baseline characterization served as a proxy when lines of sight to the optical components’ boresights were lost in later integration steps.
The Rockets for Extended-source X-ray Spectroscopy (tREXS) is a suborbital rocket program that uses a wide-field grating spectrograph to obtain spectroscopic data on extended, soft-X-ray sources. The multi-channel tREXS spectrograph uses passive, mechanical focusing optics and stacks of reflection gratings to achieve a spectral resolution of R ≈ 50 from ≈15 – 40 Å over a >10 deg2 field of view. The dispersed spectra are read out by an array of 11 X-ray CMOS detectors that form a 97-megapixel focal-plane camera. tREXS was launched for the first time in September, 2022 to observe the Cygnus Loop supernova remnant. Though a failure in the rail pumping system led to a non-detection of emission from the Cygnus Loop during the flight, the rest of the instrument performed nominally and was recovered successfully. We present here an update on the instrument, results from the first flight, and a discussion of the future outlook.
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