OVERVIEW, NASA PROPAGATION STUDIES From Objective: To enable the development of new commercial satellite systems and services and to support NASA's programs by providing timely data and models about propagation of satellite ...

This paper presents a perspective on the challenges involved in using OWL for representing the diverse heterogeneous viewpoints involved in the engineering and operation of space missions.

This paper presents an analysis of the mission benefits and technology requirements of electric propulsion thrusters designed to use oxygen (O2) as propellant, and an overview of the status of current research in this area.

Measurement made in the outer ring of the northern polar vortex from October 1991 through March 1992 reveal an altitude dependent change in ozone, with decrease at the bottom of the vortex and substantial increase at the ...

This work investigates far-infrared mapping techniques of extended emission, in the form of a circumstellar dust disk, of the main-sequence star alpha PSA.

During the IS0 mission, the ISOPHOT instrument has collected more than 1100 observations in oversampled mapping mode (AOT PHT32) in the wavelength range of45 to 240 microns. The observations comprise mapping of small and ...