Computer Science
Scientific paper
Nov 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964saosr.166.....c&link_type=abstract
SAO Special Report #166 (1964)
Computer Science
Scientific paper
An accurate determination of the instantaneous orientation of the Explorer 11 satellite (γ-ray telescope) was very important for the analysis of the data from the main experiment. Many precise observations of the solar transit obtained by means of sun and earth aspect sensors were recorded by the MIT Cosmic-Ray Group. An analysis of the decay of the average daily angular velocity in the 200-day period of observations is given first. This decay is most likely due to eddycurrent and magnetic hysteresis torques. However, a distinct correlation between variations in these (estimated by computing the daily average of H2⊥) and the measured damping torque is not completely clear. Any such correlation would be modulated by changes in the electrical and magnetic properties of the satellite components causes by variations in temperature. In the second part an analysis of the angular velocity fluctuation with a period of one orbital revolution is mad The oscillation is explained by the variation of the body's moment of inertia by thermal expansion and contraction because of periodic changes in the satellite's temperature caused by the passage of the satellite through the earth's shadow.
Colombo Giorgio
Higbie P.
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