Space debris. In 2 kn. Kn. 1. Observation Methods and Models of Space Debris / Under Science. Red. doct. Tech. Science, prof. G. G. Raikunova . - M. : PHYSMATLIT, 2014. — 248 s. — ISBN 978-5-9221-1503-2 . The book outlines the basics of methods for recording space debris by radar, optical and optoelectronic means, as well as using the method of direct impact. Considerable attention is paid to methods for processing the results of trajectory measurements and assessing the risk of collisions of observed fragments of space debris. The methodological foundations of modeling the state of debris in near-Earth space by unobserved fragments of space debris with examples of numerical calculations. are presented. A mathematical model is proposed to account for the influence of gravity on the flows of sporadic micrometeoroids in the vicinity of near-Earth orbits. For a wide range of specialists, graduate students, students and anyone interested in the achievements of astronautics .