The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is a space-borne near UV telescope with an unprecedented large field of view (200 deg2). The mission, led by the Weizmann Institute of Science and the Israel Space Agency in collaboration with DESY (Helmholtz association, Germany) and NASA (USA), is fully funded and expected to be launched to a geostationary transfer orbit in Q2/Q3 of 2025. With a grasp 300 times larger than GALEX, the most sensitive UV satellite to date, ULTRASAT will revolutionize our understanding of the hot transient universe, as well as of flaring galactic sources. We describe the mission payload, the optical design and the choice of materials allowing us to achieve a point spread function of ∼ 10 arcsec across the FoV, and the detector assembly. We detail the mitigation techniques implemented to suppress out-of-band flux and reduce stray light, detector properties including measured quantum efficiency of scout (prototype) detectors, and expected performance (limiting magnitude) for various objects.
|Original language||American English|
|Title of host publication||Space Telescopes and Instrumentation 2022|
|Subtitle of host publication||Ultraviolet to Gamma Ray|
|Editors||Jan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa|
|State||Published - 2022|
|Event||Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray - Montreal, United States|
Duration: 17 Jul 2022 → 22 Jul 2022
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Conference||Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray|
|Period||17/07/22 → 22/07/22|
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