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2.65 e 10~13

•41 . aj-a, IS THE DIFFERENCE IN ACCELERATION BETWEEN POINTS p, AND p, WHOSE DISTANCES FROM THE CENTER OF THE MASSIVE OBJECT ARE i, AND r AND « »

•41 . aj-a, IS THE DIFFERENCE IN ACCELERATION BETWEEN POINTS p, AND p, WHOSE DISTANCES FROM THE CENTER OF THE MASSIVE OBJECT ARE i, AND r AND « »

For gravity-gradient or three-axis-stabilized satellites with long, flexible appendages, theJ2 effect becomes significant in overall attitude motion. For example, consider the potential function for the Earth written as

• See Section 43 for definition of various reference surfaces.

The values for each of these terms are compared in Table 5-5 for 0 = 90 deg, where it is seen that although UJj is large compared with Uj and Uj4, it is only about 0.05% the value of 1/q.* Moreover, the importance of zonal harmonic corrections

Table 5-5. Comparison of Various Zonal Harmonic Terms in the Expansion for the Earth's Gravitational Potential Over the Equator

altitude (KM)

0 0

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