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Physical limits of solar collectors in deflecting Earth-threatening asteroids

Kahle, Ralph and Kührt, Ekkehard and Hahn, Gerhard and Knollenberg, Jörg (2005) Physical limits of solar collectors in deflecting Earth-threatening asteroids. Aerospace Science and Technology, 10 (3), pp. 256-263. Elsevier. DOI: 10.1016/j.ast.2005.12.004.

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6VK2-4J5T4YG-1-3&_cdi=6110&_user=100058&_orig=search&_coverDate=04%2F30%2F2006&_sk=999899996&view=c&wchp=dGLbVzb-zSkzV&md5=8bbe7996f50486d51bb5a4dc542038b1&ie=/sdarticle.pdf

Abstract

This paper investigates the physical limits of a solar collector for orbit deflection of near-Earth asteroids (NEAs) on a collision course with Earth. For decades of warning time a small change of NEA orbital velocity Δv by a few mm/s might suffice to alter the collision path into an Earth fly-by and consequently avert a local or even global catastrophe. In principle this can be achieved by a spacecraft that carries a large solar collector. The latter focuses sunlight onto the NEA surface in order to vaporize surface material, hence transferring a continuous momentum to the NEA. We model evaporation process and vapour expansion to show that the functionality exists. From the analysis of focussing misalignments and collector degradation we find that a considerable operational effort is required to maintain operating conditions. The most important result is that the collector lifetime is limited to only a few minutes. Therefore a solar collector might only be applicable to NEAs with size ‹ 250 m if Δv ‹ 0.1 mm/s is required. We also discuss capabilities for the prolongation of collector lifetime and hence an increase of NEA application size range.

Document Type:Article
Title:Physical limits of solar collectors in deflecting Earth-threatening asteroids
Authors:
AuthorsInstitution or Email of Authors
Kahle, RalphUNSPECIFIED
Kührt, EkkehardUNSPECIFIED
Hahn, GerhardUNSPECIFIED
Knollenberg, JörgUNSPECIFIED
Date:9 June 2005
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:10
DOI:10.1016/j.ast.2005.12.004
Page Range:pp. 256-263
Publisher:Elsevier
Status:Published
Keywords:asteroid, orbit deflection, solar collector
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof , Oberpfaffenhofen
Institutes and Institutions:Institute of Planetary Research
Space Operations and Astronaut Training
Deposited By: Dr.-Ing. Ralph Kahle
Deposited On:05 May 2006
Last Modified:14 Jan 2010 20:45

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