By Victor G. Szebehely

First 3 paragraphs of the preface:

This interdisciplinary publication combines the astronomical and the engineering ways to these questions of area learn that are often called orbit and trajectory difficulties. the recent be aware Astrodynamics (no connection with stellar dynamics) intends to symbolize a box which emphasizes the engineering facets of dynamical astronomy.

The software of a hugely built mathematical technological know-how that's soundly embedded in 1000's of years of culture to the latest en- gineering difficulties is among the so much not easy initiatives to representa- tives of either fields. This publication intends to fulfill this problem through conceal- ing the main major and up to date advancements in a scientific, notwithstanding under no circumstances textbook like, demeanour. it's ready for the employee within the box with history in celestial mechanics and with familiarity with the engineering problems.

The chapters are equipped in keeping with the key sensible topics of area dynamics instead of alongside operational traces. certainly, it's geared toward the dialogue, first, of common rules, after which those are interspersed with examples.

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**Example text**

Ref. 3, Eqs. (49) and ( 5 0 ) ] . Returning to Fig. 2, we note that for £ = 1 (which as will be shown presently corresponds to grazing the surface of the moon approximately for all values of p), U ( Y - & ) is the percentage e r r o r committed by neglecting the corrections of order JJL to the outer expansion. The striking feature of this graph is the negligible magnitude of the e r r o r for values of p not close to unity. This undoubtedly accounts for the reputed success of the patching of conies and its failure near the minimal energy value where the higher-order terms become extremely significant.

There Is only one free (independent) parameter left in the problem: the Jacobian constant C. The selection of a particular value of C (less than a critical value given by the Jacobian integral) allows a trajectory to be constructed, which connects P-, and P? in the w plane. The totality of such trajectories, for all possible values of C, form the family of orbits with consecutive collisions. We define a group as a subset of the family in the following way. Consider a trajectory connecting P-, and P~ which is obtained using a value of the Jacobian constant C-,.

The striking feature of this graph is the negligible magnitude of the e r r o r for values of p not close to unity. This undoubtedly accounts for the reputed success of the patching of conies and its failure near the minimal energy value where the higher-order terms become extremely significant. It should be borne in mind that even when U("y-6) is numerically small, its effect is still very significant when we are 17 Purchased from American Institute of Aeronautics and Astronautics P. A. LAGERSTROM AND J.