This book includes a selection of reviewed and enhanced contributions presented at the SpaceOps2021, the 16thInternationalConferenceon Space Operations, held virtually in May 2021. Thechapterselections were made based upon their relevance to the current space operations community. The contributions represent a cross-section of three main subject areas: Mission Management – management tasks for designing, preparing and operating a particular mission; Spacecraft Operations – preparation and implementation of all activities to operate a space vehicle (crewed and uncrewed) under all...