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Impact experiments. I - Ejecta velocity distributions and related results from regolith targetsResults are reported of laboratory measurements of the velocity distributions of powdery ejecta of 14 impacts into powders simulating regolith in near vacuum. The impact velocities ranged from 5-2321 m/sec, a velocity range believed prevalent in the early solar system. The powder was mechanically similar to lunar regolith. The projectiles comprised harder materials than the regolith, i.e., pyrex spheres, basalt spheres and cylinders, and igneous rocks. High-speed photography was employed to record the events. The differences between the present results and those from hypervelocity impacts are discussed in detail. Notably, an impact velocity threshold was detected between 10-30 m/sec, below which the amount of ejecta is less than the projectile mass.
Document ID
19850067804
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hartmann, W. K.
(Science Applications International Corp. Planetary Science Institute, Tucson, AZ, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1985
Publication Information
Publication: Icarus
Volume: 63
ISSN: 0019-1035
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
ISSN: 0019-1035
Accession Number
85A49955
Funding Number(s)
CONTRACT_GRANT: NASW-2909
Distribution Limits
Public
Copyright
Other

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