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TWO 73-m FIBERGLASS TAPERED BOOMS. El - 26 N m*. p - 330 g/m

system modes) were superimposed on the longer period librational motion [Lawlor, i et al., 1974]. By exciting antisymmetrical modes, the properties of the flexible «

booms could be deduced from attitude data and, hence, the antenna configuration : during the steady state could be determined. The modified shape had a significant influence on the interpretation of radio astronomy scientific data.

References

1. Beard, R. M., J. E. Kronenfeld, H. Gotts, and D. Alderman, Evaluation of the ji SSS-1 Star Sensor Attitude Determination, Comp. Sc. Corp., 9101-16600-01TN, Aug. 1973. |

2. Blanchard, D. L., R. M. Davis, E. A. Lawlor, and L. Beltracchi, "Design, j; Simulation and Flight Performance of Radio Astronomy Explorer-A Satel- >; lite," Proceedings of the Symposium on Gravity-Gradient Attitude Stabilization, | Aerospace Corp., AD-696-694, Dec. 1968. j]

3. Byrd, P. F. and M. D. Friedman, Handbook of Elliptic Integrals. Second ; Edition, Berlin: Springer-Verlag, 1971. . I

4. Fitzpatrick, Philip M., Principles of Celestial Mechanics. New York: Academic ■ ; Press, Inc., 1970.

5. Flatley, T., Sun Sighting From a Spinning Spacecraft, NASA X-732-72-139, j¡ GSFC, May 1972a. )

6. -, Magnetic Active Nutation Damping on Explorer 45 (SSS-A), NASA i

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