We describe radar observations at 8510 MHz of 39 small particles in Ea
rth orbit. The altitudes vary between 510 and 1550 km, while the radia
l velocities lie between -310 and +520 m/s. Regarding all the observat
ions as belonging to one statistical population, we calculate with the
principle of least squares a best fitting semimajor axis and eccentri
city. The semimajor axis is (7450+98/-92) km, while the eccentricity i
s (0.039+0.012/-0.016).