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ExploreNEOs III: Size, Albedo, And Thermal History Of 58+ Low-deltaV NEOs

Mueller, M. und Delbo, M. und Trilling, D.E. und Bhattacharya, B. und Bottke, W.F. und Chesley, S. und Emery, J.P. und Fazio, G.G. und Harris, A.W. und Hora, J.L. und Mainzer, A. und Mommert, M. und Penprase, B. und Smith, H.A. und Spahr, T.B. und Stansberry, J.A. und Thomas, C.A. (2010) ExploreNEOs III: Size, Albedo, And Thermal History Of 58+ Low-deltaV NEOs. In: Bulletin of the American Astronomical Society, 42 (4), Seite 1081. American Astronomical Society. American Astronomical Society Division for Planetary Sciences meeting #42, 3-8 Oct 2010, Pasadena, USA. ISSN 0002-7537

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Offizielle URL: http://www.abstractsonline.com/plan/ViewAbstract.aspx?mID=2704&sKey=8102c03d-20b1-47e2-951c-335d761edbf4&cKey=55565381-6614-4917-891b-5b1defc77300&mKey={D515DFC0-245C-4047-81CC-C221DC1A54C6}


Space missions to NEOs are being planned at all major space agencies, and recently President Obama announced the goal of a manned mission to an NEO. Efforts to find and select suitable targets (plus backup targets) are severely hampered by our lack of knowledge on the physical properties of dynamically favorable NEOs. In particular, current mission scenarios tend to favor primitive low-albedo objects. For the vast majority of NEOs the albedo is unknown. We report new constraints on the size and albedo of NEOs with rendezvous deltaV < 7 km/s. Our results are based on thermal flux data obtained in the framework of our ongoing ExploreNEOs survey (Trilling et al., 2010) using NASA's "Warm Spitzer" space telescope. As of this writing, we have results for 253 objects in hand (including the 58 low-deltaV NEOs presented here); before the end of 2011 we expect to have measured the size and albedo of ~700 NEOs (including probably ~160 low-deltaV NEOs). Due to the nature of our observations, our results are generally more accurate for low-albedo objects than for their high-albedo counterparts. While there are reasons to believe that primitive volatile-rich materials are universally low in albedo, the converse need not be true: The orbital evolution of some objects caused them to lose their volatiles by coming too close to the Sun. For all our targets, we give the closest perihelion distance they are likely to have reached (using orbital integrations from Marchi et al., 2009) and corresponding upper limits on the past surface temperature. Low-deltaV objects for which both albedo and thermal history suggest a primitive composition include (162998) 2001 SK162, (68372) 2001 PM9, and (100085) 1992 UY4. This work is based on observations made with the Spitzer Space Telescope, which is operated by JPL, Caltech under a contract with NASA.

Dokumentart:Konferenzbeitrag (Paper)
Titel:ExploreNEOs III: Size, Albedo, And Thermal History Of 58+ Low-deltaV NEOs
AutorenInstitution oder E-Mail-Adresse der Autoren
Mueller, M.Universite de Nice Sophia Antipolis, France
Delbo, M.Universite de Nice Sophia Antipolis, France
Trilling, D.E.Northern Arizona University, USA
Bhattacharya, B.NASA Herschel Science Center Caltech, USA
Bottke, W.F.Southwest Research Institute, USA
Chesley, S.Jet Propulsion Laboratory, California Institute of Technology, USA
Emery, J.P.Department of Earth and Planetary Sciences, University of Tennessee, USA
Fazio, G.G.Harvard-Smithsonian Center for Astrophysics, USA
Harris, A.W.alan.harris@dlr.de
Hora, J.L.Harvard-Smithsonian Center for Astrophysics, USA
Mainzer, A.Jet Propulsion Laboratory, California Institute of Technology, USA
Mommert, M.michael.mommert@dlr.de
Penprase, B.Department of Physics and Astronomy, Pomona College, USA
Smith, H.A.Harvard-Smithsonian Center for Astrophysics, USA
Spahr, T.B.Harvard-Smithsonian Center for Astrophysics, USA
Stansberry, J.A.Steward Observatory, University of Arizona, USA
Thomas, C.A.Northern Arizona University, USA
Datum:Oktober 2010
Erschienen in:Bulletin of the American Astronomical Society
Seitenbereich:Seite 1081
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Verlag:American Astronomical Society
Stichwörter:Near-Earth objects, Spitzer Space telescope
Veranstaltungstitel:American Astronomical Society Division for Planetary Sciences meeting #42
Veranstaltungsort:Pasadena, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:3-8 Oct 2010
Veranstalter :American Astronomical Society
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Asteroiden und Kometen (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Prof. Alan Harris
Hinterlegt am:03 Jan 2011 20:45
Letzte Änderung:03 Jan 2011 20:45

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