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  Stardust Interstellar Preliminary Examination I: Identification of tracks in aerogel

Westphal, A. J., Anderson, D., Butterworth, A. L., Frank, D. R., Lettieri, R., Marchant, W., et al. (2014). Stardust Interstellar Preliminary Examination I: Identification of tracks in aerogel. Meteoritics & Planetary Science, 49(9), 1509-1521. doi:10.1111/maps.12168.

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Westphal, Andrew J.1, Author
Anderson, David1, Author
Butterworth, Anna L.1, Author
Frank, David R.1, Author
Lettieri, Robert1, Author
Marchant, William1, Author
Von Korff, Joshua1, Author
Zevin, Daniel1, Author
Ardizzone, Augusto1, Author
Campanile, Antonella1, Author
Capraro, Michael1, Author
Courtney, Kevin1, Author
Criswell III, Mitchell N.1, Author
Crumpler, Dixon1, Author
Cwik, Robert1, Author
Gray, Fred Jacob1, Author
Hudson, Bruce1, Author
Imada, Guy1, Author
Karr, Joel1, Author
Wah, Lily Lau Wan1, Author
Mazzucato, Michele1, AuthorMotta, Pier Giorgio1, AuthorRigamonti, Carlo1, AuthorSpencer, Ronald C.1, AuthorWoodrough, Stephens B.1, AuthorSantoni, Irene Cimmino1, AuthorSperry, Gerry1, AuthorTerry, Jean-Noel1, AuthorWordsworth, Naomi1, AuthorYahnke Sr., Tom1, AuthorAllen, Carlton1, AuthorAnsari, Asna1, AuthorBajt, Saša1, AuthorBastien, Ron K.1, AuthorBassim, Nabil1, AuthorBechtel, Hans A.1, AuthorBorg, Janet1, AuthorBrenker, Frank E.1, AuthorBridges, John1, AuthorBrownlee, Donald E.1, AuthorBurchell, Mark1, AuthorBurghammer, Manfred1, AuthorChangela, Hitesh1, AuthorCloetens, Peter1, AuthorDavis, Andrew M.1, AuthorDoll, Ryan1, AuthorFloss, Christine1, AuthorFlynn, George1, AuthorGainsforth, Zack1, AuthorGrün, Eberhard1, AuthorHeck, Philipp R.1, AuthorHillier, Jon K.1, AuthorHoppe, Peter2, Author           Huth, Joachim2, Author           Hvide, Brit1, AuthorKearsley, Anton1, AuthorKing, Ashley J.1, AuthorLai, Barry1, AuthorLeitner, Jan2, Author           Lemelle, Laurence1, AuthorLeroux, Hugues1, AuthorLeonard, Ariel1, AuthorNittler, Larry R.1, AuthorOgliore, Ryan1, AuthorOng, Wei Ja1, AuthorPostberg, Frank1, AuthorPrice, Mark C.1, AuthorSandford, Scott A.1, AuthorSans Tresseras, Juan-Angel 1, AuthorSchmitz, Sylvia1, AuthorSchoonjans, Tom1, AuthorSilversmit, Geert1, AuthorSimionovici, Alexandre S.1, AuthorSolé, Vicente A.1, AuthorSrama, Ralf1, AuthorStephan, Thomas1, AuthorSterken, Veerle J.1, AuthorStodolna, Julien1, AuthorStroud, Rhonda M.1, AuthorSutton, Steven1, AuthorTrieloff, Mario1, AuthorTsou, Peter1, AuthorTsuchiyama, Akira1, AuthorTyliszczak, Tolek1, AuthorVekemans, Bart1, AuthorVincze, Laszlo1, AuthorZolensky, Michael E.1, Author more..
Affiliations:
1external, ou_persistent22              
2Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              

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 Abstract: Here, we report the identification of 69 tracks in approximately 250 cm(2) of aerogel collectors of the Stardust Interstellar Dust Collector. We identified these tracks through Stardust@home, a distributed internet-based virtual microscope and search engine, in which > 30,000 amateur scientists collectively performed >9 x 10(7) searches on approximately 10(6) fields of view. Using calibration images, we measured individual detection efficiency, and found that the individual detection efficiency for tracks > 2.5 mu m in diameter was >0.6, and was >0.75 for tracks >3 mu m in diameter. Because most fields of view were searched >30 times, these results could be combined to yield a theoretical detection efficiency near unity. The initial expectation was that interstellar dust would be captured at very high speed. The actual tracks discovered in the Stardust collector, however, were due to low-speed impacts, and were morphologically strongly distinct from the calibration images. As a result, the detection efficiency of these tracks was lower than detection efficiency of calibrations presented in training, testing, and ongoing calibration. Nevertheless, as calibration images based on low-speed impacts were added later in the project, detection efficiencies for low-speed tracks rose dramatically. We conclude that a massively distributed, calibrated search, with amateur collaborators, is an effective approach to the challenging problem of identification of tracks of hypervelocity projectiles captured in aerogel.

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 Dates: 2014-09
 Publication Status: Issued
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 Rev. Type: -
 Identifiers: ISI: 000342912100001
DOI: 10.1111/maps.12168
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Title: Meteoritics & Planetary Science
Source Genre: Journal
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Pages: - Volume / Issue: 49 (9) Sequence Number: - Start / End Page: 1509 - 1521 Identifier: ISSN: 1086-9379