Parameter estimation supplement to the Mission Analysis Evaluation and Space Trajectory Operations program (MAESTRO)

This Parameter Estimation Supplement describes the PEST computer program and gives instructions for its use in determination of lunar gravitation field coefficients. PEST was developed for use in the RAE-B lunar orbiting mission as a means of lunar field recovery. The observations processed by PEST are short-arc osculating orbital elements. These observations are the end product of an orbit determination process obtained with another program. PEST's end product it a set of harmonic coefficients to be used in long-term prediction of the lunar orbit. PEST employs some novel techniques in its estimation process, notably a square batch estimator and linear variational equations in the orbital elements (both osculating and mean) for measurement sensitivities. The program's capabilities are described, and operating instructions and input/output examples are given. PEST utilizes MAESTRO routines for its trajectory propagation. PEST's program structure and subroutines which are not common to MAESTRO are described. Some of the theoretical background information for the estimation process, and a derivation of linear variational equations for the Method 7 elements are included

Attempt to Monopolize: Dangerous Probability of Success as an Obstacle to Enforcing Section 2 of the Sherman Act

This Comment analyzes the conflicting definitions of attempt to monopolize as applied to the Sherman Act. First, the Comment outlines the majority position requiring proof of dangerous probability of success in an attempt to monopolize case under section 2 of the Sherman Act. Next, the Comment examines the minority position and finds that it raises countervailing concerns that warrant eliminating the dangerous probability of success requirement. Finally, this Comment concludes that the dangerous probability of success element adds nothing but confusion to the attempt to monopolize analysis and should therefore be eliminated

Book Review: Backyard Wilderness

This book review examines David Knibb\u27s Backyard Wilderness

Radio astronomy Explorer-B in-flight mission control system development effort

A description is given of the development for the Mission Analysis Evaluation and Space Trajectory Operations (MAESTRO) program to be used for the in-flight decision making process during the translunar and lunar orbit adjustment phases of the flight of the Radio Astronomy Explorer-B. THe program serves two functions: performance and evaluation of preflight mission analysis, and in-flight support for the midcourse and lunar insertion command decisions that must be made by the flight director. The topics discussed include: analysis of program and midcourse guidance capabilities; methods for on-line control; printed displays of the MAESTRO program; and in-flight operational logistics and testing

Book Review: Backyard Wilderness

This book review examines David Knibb\u27s Backyard Wilderness