  The increasing number of objects orbiting the Earth justifies the great
attention and interest in the observation, spacecraft protection and collision
avoidance. These studies involve different disturbances and resonances in the
orbital motions of these objects distributed by the distinct altitudes. In this
work, the TLE (Two-Line Elements) of the NORAD are studied observing the
resonant period of the objects orbiting the Earth and the main resonance in the
LEO region. The time behavior of the semi-major axis, eccentricity and
inclination of some space debris are studied. Possible irregular motions are
observed by the frequency analysis and by the presence of different resonant
angles describing the orbital dynamics of these objects.
