Accession Number:

AD0435704

Title:

ON METEOROIDS AND PENETRATION

Descriptive Note:

Corporate Author:

SMITHSONIAN ASTROPHYSICAL OBSERVATORY CAMBRIDGE MA

Personal Author(s):

Report Date:

1963-05-16

Pagination or Media Count:

13.0

Abstract:

Estimates of the meteoroid penetration of vehicles in space are improved from the authors 1957 values. The meteoritic data are improved by the measurement of luminous efficiency in the artificial meteor experiment of Trailblazer 1, analyzed by McCrosky and Soberman, and by independent determinations from three asteroidal meteors by Cook, Jacchia, and McCrosky. A review of the photographic meteor data leads to an adopted meteoroid density of 0.44 gcm and a mass of 1.0 gram for a zero-magnitude visual meteor of velocity 30 kmsec. Hawkins and Uptons influx rate of visual meteors is utilized after correction for the zero-magnitude mass. A mean velocity of 22 kmsec is adopted. The formula by Herrmann and Jones from their summary of hypervelocity impact experiments provides the penetration of a low-density body against a semi-infinite target. The ratio of perforation thickness for a thin target to the penetration in a semi-infinite target is adopted as 1.5. The calculated perforation rate on a 0.1-cm-thick plate of aluminum in the earths neighborhood is reduced by a factor of more than 3000 from the 1957 estimate. The change logarithmically is divided about equally between the changes in meteoroid data and in the impact formula.

Subject Categories:

  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE