Aerospace Instrument-Making Annotation << Back Main Trends of the Development and Task Planning for Small Satellites and Satellite Constellations of Earth Observation. Part 2 Zelentsov V.A. The article presents the second part of the review devoted to operational planning application of small Earth observation satellites (SEOS) and satellite constellations based on SEOS (SCEOS) taking into account the main trends in the development of SEOS analyzed in the first part. High dynamics of growth in the number of publications and patented solutions on this topic is noted. The main classifi cation features by which the problems statements and planning methods differ are considered: the composition of optimization criteria and restrictions, types of observation objects, the degree of planning centralization, solution algorithms, and others. The analysis of existing approaches to determine the schedules for observation objects surveying is carried out from the point of view of their applicability in complex operational planning for SCEOS, including when solving the most complex planning problems for heterogeneous SCEOS consisting of SEOS with different types of observation equipment. It is concluded that existing approaches for operational planning problems solving require further development based on complex analytical and simulation modeling, searching for ways to apply classical methods of multi-criteria optimization and their joint use with actively developing multi-agent technologies, metaheuristic algorithms, and machine learning methods. Keywords: small spacecraft, multi-satellite constellation, task planning, multi-criteria optimization, model-algorithmic support. DOI: 10.25791/aviakosmos.1.2025.1452 Pp. 03-13.