В работе предложена концепция управляемого предапертурного зеркала для быстрого перенаведения широкоугольного телескопа с полем зрения 3.75 ◦ и апертурой 30 см для космической системы обнаружения декаметровых астероидов (проект СОДА). Область наведения составляет 50 ◦ × 120 ◦ , время перенаведения между соседними площадками не более 3 с. Рассмотрены ближайшие российские и зарубежные аналоги, даны рекомендации по использованию управляемого зеркала в проекте СОДА. We propose a conceptual design of a controlled pre-aperture mirror for the fast repositioning of a wide field telescope with a field of view of 3.75 ◦ and an aperture of 30 cm for a space system to detect decameter sized asteroids (the SODA project). The pointing area is 50 ◦ × 120 ◦ and the repointing time between the adjacent fields is less than 3 seconds. Similar systems, equipped with a pre-aperture mirror, from different Russian and foreign projects have been considered, as well as recommendations on the use of a controlled mirror in the SODA project.
The project SODA (System of Observation of Day-time Asteroids) designed for exhaustive detection of decameter (>5-10m) meteoroids approaching the Earth from the day-time sky. The system consists of two Spacecraft (SC) placed into orbitsin the vicinity of the Lagrange point L1 of the Sun-Earth system. Each SC is equipped with one to three small aperture(25-30 cm) telescopes that are to observe near space in a conical region around the Earth. For objects on collisional orbitsthe SODA ensures a warning time of 10-20 hours and the coordinates of the atmospheric entry point with up to 10×100km accuracy.
В работе предложена оптическая схема широкоугольного телескопа с полем зрения 3.75 ◦ и апертурой 30 см для космической системы обнаружения декаметровых астероидов (проект СОДА). Основная отличительная особенность телескопа - наличие предапертурного плоского зеркала, обеспечивающего область наведения 50 ◦ × 120 ◦ , время перенаведения между соседними площадками составит не более 3 с. Предложен современный КМОП детектор с мелким пикселем. В работе представлены области обзора телескопов проекта СОДА из точки Лагранжа L 1 при использовании двух, трех и четырех телескопов, кратко обсуждены преимущества и недостатки каждого из вариантов. We propose an optical scheme of a telescope with a field of view of 3.75 ◦ and 30 cm aperture for the space system for observation of decameter size asteroids (the SODA project). The main distinctive feature of this telescope is a pre-aperture flat mirror that provides an observation area of 50 ◦ ×120 ◦ and a repointing time between the adjacent fields of less than 3 s. A modern CMOS detector with a small pixel is proposed. Observable sky area when using 2, 3 and 4 telescopes are described. The advantages and disadvantages of each option are briefly discussed.
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