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This report provides an analysis of the orbital performance of the three DMSP 5D3 spacecraft presently on orbit. The mission of the DMSP spacecraft is to collect and disseminate global high-resolution visible and thermal cloud cover imagery for DoD forces and the intelligence community. The present two-satellite constellation (early morning and mid morning) has an inclination of 98.7 with a 458 nmi sun synchronous polar orbit. The orbit period is I0l min with eclipses lasting up to 35 min. The satellites complete 14.2 revolutions around the Earth each day. The report presents data from the satellite telemetry that will allow determination of the spacecraft power demand for the range of sun angles and spacecraft configurations for the three operational 5D3 spacecraft. This is used in determining spacecraft energy balance margins under various operating conditions.