Aluminum-rich Orbital Debris Colliding With LDEF's Trailing Edge

Details Aluminum-rich Orbital Debris Colliding With LDEF's Trailing Edge Aluminum-rich Orbital Debris Colliding With LDEF's Trailing Edge

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..105b&link_type=abstract

Lunar and Planetary Science, volume 27, page 105

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Aluminum, Debris: Man-Made, Frequency, Long Duration Exposure Facility (Ldef), Trailing Edge

Scientific paper

The Long Duration Exposure Facility (LDEF) was a 12 sided, non-spinning cylinder that resided in low-Earth orbit for ~5.7 years. Due to its non-spinning nature, each of the 12 sides will reflect the specific fluxes and velocity distributions of both natural and man-made hypervelocity particles representing a specific viewing geometry relative to the spacecraft's velocity vector. Prior to LDEF most small-scale (< 1 mm) man-made objects were believed to reside in essentially circular orbits such that few, if any, would catch up with the trailing-edge (i.e., anti-ram direction) surfaces of LDEF. However, compositional analysis, by a number of groups using SEM-EDS and SIMS methods, revealed the presence of man-made impactors on a variety of surfaces residing on LDEF's trailing edge. Such residues consisted predominantly of aluminum-rich projectiles, yet other particles types, such as paint-flakes, electronic components, or stainless steel were also reported. These findings mandate particles in highly elliptical, low-inclinations orbits from sources such as vehicles used to transfer payloads to geostationary orbits; such sources were not considered significant prior to LDEF's retrieval.

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