Computer Science
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7832019w&link_type=abstract
Unknown
Computer Science
Optical Tracking, Satellite Rotation, Spacecraft Tracking, Specular Reflection, Spin Reduction, Aerodynamic Drag, Computer Programs, Eddy Currents, Magnetic Effects, Rotating Cylinders, Tumbling Motion
Scientific paper
The periodic changes of brightness of many of the artificial earth satellites which can be seen with the naked eye or with the aid of binoculars are generally due to tumbling or spinning of the satellites which changes the aspect of reflecting surfaces on the satellites to the sun and the observer. The variations are most easily noticed when the rotation period is of the order of a few seconds, and can take on a smoothly-changing nature, a flashing appearance, or some combination of the two. Among the factors causing changes in satellite rotation are air drag and eddy current torques. The dynamics of discarded rocket bodies are deduced from observations of the flash period and used to estimate the torques acting on them. From the estimated torques, statements are made about the air density and magnetic field near orbit.
Meadows Jack A.
Williams Vernon
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