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FORECASTOR: an exposure time calculator for the CASTOR space mission simulating UVMOS spectroscopy

The Cosmological Advanced Survey Telescope for optical and UV research (CASTOR) is a proposed Canadian Space Agency-led mission that will provide wide-field imaging and spectroscopy in the ultraviolet and blue optical region. CASTOR will fill the “UV-optical gap” in space astronomy after the Hubble Space Telescope, enabling new discovery opportunities in the solar system and beyond to the nature of the cosmos, especially in partnership with the other great wide-field observatories of the next decade (e.g., Euclid, Roman, Rubin). Here, we expand on FORECASTOR (finding optics requirements and exposure times for CASTOR), a coordinated suite of science planning tools for the CASTOR mission. We describe a pixel-based, user-friendly, exposure time calculator for the UVMOS spectroscopic mode, complementary to the photometric exposure time calculator developed earlier this year. These open-source tools are hosted on the Canadian advanced network for astronomical research for community use with no configuration required.