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Meteorite Impact Ejecta: Dependence of Mass and Energy Lost on Planetary Escape Velocity

O'Keefe, John D. and Ahrens, Thomas J. (1977) Meteorite Impact Ejecta: Dependence of Mass and Energy Lost on Planetary Escape Velocity. Science, 198 (4323). pp. 1249-1251. ISSN 0036-8075. http://resolver.caltech.edu/CaltechAUTHORS:20151116-133940996

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Abstract

The calculated energy efficiency of mass ejection for iron and anorthosite objects striking an anorthosite planet at speeds of 5 to 45 kilometers per second decreases with increasing impact velocity at low escape velocities. At escape velocities of > 10^5 and > 2 x 10^4 centimeters per second, respectively, the slower impactors produce relatively less ejecta for a given impact energy. The impact velocities at which ejecta losses equal meteorite mass gains are found to be approximately 20, 35, and 45 kilometers per second for anorthosite objects and approximately 25, 35, and 40 kilometers per second for iron objects striking anorthosite surfaces for the gravity fields of the moon, Mercury, and Mars.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.198.4323.1249-aDOIArticle
http://www.jstor.org/stable/1745840JSTORArticle
Additional Information:© 1977 American Association for the Advancement of Science. Received 24 June 1977; revised 22 August 1977. This research was supported by NASA grant NSG 7129. We appreciate critical comments on the manuscript by H. Melosh and R. Jeanloz and the computational assistance of M. Lainhart. This is contribution No. 2928 of the Division of Geological and Planetary Sciences, California Institute of Technology.
Funders:
Funding AgencyGrant Number
NASANSG 7129
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences2928
Record Number:CaltechAUTHORS:20151116-133940996
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20151116-133940996
Official Citation:Meteorite Impact Ejecta: Dependence of Mass and Energy Lost on Planetary Escape Velocity JOHN D. O'KEEFE and THOMAS J. AHRENS Science 23 December 1977: 198 (4323), 1249-1251. [DOI:10.1126/science.198.4323.1249-a]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62129
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Nov 2015 19:47
Last Modified:18 Nov 2015 19:47

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