The given information on the catalogued space debris population was obtained from the DISCOS [RD.87] database. The figures show the situation in September 2008.
The time evolution of the number of trackable objects in orbit is shown in Figure J-1.
The altitude dependence for the lower altitudes is given in Figure J-2.
The object distribution as function of their inclination is plotted in Figure J-3. A concentration at certain inclinations is clearly visible.