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Micro-X is a sounding rocket-borne instrument that uses a microcalorimeterarray to perform high-resolution X-ray spectroscopy. This instrument flew forthe first time on July 22nd, 2018 from the White Sands Missile Range, USA. Thisflight marks the first successful operation of a Transition-Edge Sensor arrayand its time division multiplexing read-out system in space. This launch wasdedicated to the observation of the supernova remnant Cassiopeia A. A failurein the attitude control system prevented the rocket from pointing and led to notime on target. The on-board calibration source provided X-rays in flight, andit is used to compare detector performance during pre-flight integration,flight, and after the successful post-flight recovery. This calibration datademonstrates the capabilities of the detector in a space environment as well asits potential for future flights.

First Operation of TES Microcalorimeters in Space with the Micro-X Sounding Rocket