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The Star-Planet Activity Research CubeSat (SPARCS) is a NASA-fundedastrophysics mission, devoted to the study of the ultraviolet (UV) time-domainbehavior in low-mass stars. Given their abundance and size, low-mass stars areimportant targets in the search for habitable-zone, exoplanets. However, notenough is known about the stars flare and quiescent emission, which powersphotochemical reactions on the atmospheres of possible planets. Over itsinitial 1-year mission, SPARCS will stare at ~10 stars in order to measureshort- (minutes) and long- (months) term variability simultaneously in thenear-UV (NUV - lam = 280 nm) and far-UV (FUV - lam = 162 nm). The SPARCSpayload consists of a 9-cm reflector telescope paired with two high-sensitivity2D-doped CCDs. The detectors are kept passively cooled at 238K, in order toreduce dark-current contribution. The filters have been selected to providestrong rejection of longer wavelengths, where most of the starlight is emitted.The payload will be integrated within a 6U CubeSat to be placed on aSun-synchronous terminator orbit, allowing for long observing stares for alltargets. Launch is expected to occur not earlier than October 2021.

The Star-Planet Activity Research CubeSat (SPARCS): A Mission to Understand the Impact of Stars in Exoplanets