C
Christopher J. Snead
Researcher at Jacobs Engineering Group
Publications - 57
Citations - 4073
Christopher J. Snead is an academic researcher from Jacobs Engineering Group. The author has contributed to research in topics: Comet & Interplanetary dust cloud. The author has an hindex of 21, co-authored 56 publications receiving 3876 citations. Previous affiliations of Christopher J. Snead include University of California, Los Angeles & University of California, Berkeley.
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Journal ArticleDOI
Comet 81P/Wild 2 under a microscope.
Donald E. Brownlee,Peter Tsou,Jérôme Aléon,Conel M. O'd. Alexander,Tohru Araki,Saša Bajt,G. A. Baratta,Ron K. Bastien,Phil Bland,Phil Bland,Pierre Bleuet,Janet Borg,John P. Bradley,Adrian J. Brearley,Frank E. Brenker,Sean Brennan,John Bridges,Nigel D. Browning,Nigel D. Browning,John Robert Brucato,Emma S. Bullock,Mark J. Burchell,Henner Busemann,Anna L. Butterworth,Marc Chaussidon,Allan Cheuvront,Miaofang Chi,Mark J. Cintala,Benton C. Clark,Simon J. Clemett,George D. Cody,Luigi Colangeli,George Cooper,Patrick Cordier,Charles P. Daghlian,Zu Rong Dai,Louis Le Sergeant d'Hendecourt,Zahia Djouadi,Gerardo Dominguez,Tom Duxbury,Jason P. Dworkin,Denton S. Ebel,Thanasis E. Economou,Sirine C. Fakra,Sam A. J. Fairey,Stewart Fallon,G. Ferrini,T. Ferroir,Holger Fleckenstein,Christine Floss,George J. Flynn,Ian A. Franchi,Marc Fries,Zack Gainsforth,J-P Gallien,M. J. Genge,Mary K. Gilles,Philipe Gillet,Jamie Gilmour,Daniel P. Glavin,Matthieu Gounelle,Monica M. Grady,Giles A. Graham,Patrick G. Grant,Simon F. Green,F. Grossemy,Lawrence Grossman,Jeffrey N. Grossman,Yunbin Guan,Kenji Hagiya,Ralph P. Harvey,Philipp R. Heck,Gregory F. Herzog,Peter Hoppe,Friedrich Hörz,Joachim Huth,Ian D. Hutcheon,Konstantin Ignatyev,Hope A. Ishii,Motoo Ito,Damien Jacob,Chris Jacobsen,Stein B. Jacobsen,Steven Jones,David J. Joswiak,A. J. G. Jurewicz,Anton T. Kearsley,Lindsay P. Keller,H Khodja,A. L. David Kilcoyne,Jochen Kissel,Alexander N. Krot,Falko Langenhorst,Antonio Lanzirotti,Loan Le,Laurie A. Leshin,Jan Leitner,Laurence Lemelle,Hugues Leroux,Ming-Chang Liu,K. Luening,Ian C. Lyon,G. J. MacPherson,Matthew A. Marcus,Kuljeet K. Marhas,Bernard Marty,Graciela Matrajt,Kevin D. McKeegan,Anders Meibom,Vito Mennella,Keiko Messenger,Scott Messenger,Takashi Mikouchi,Smail Mostefaoui,Tomoki Nakamura,T Nakano,Matthew Newville,Larry R. Nittler,Ichiro Ohnishi,Kazumasa Ohsumi,Kyoko Okudaira,D. A. Papanastassiou,Russ Palma,Russ Palma,Maria Elisabetta Palumbo,Robert O. Pepin,David Perkins,Murielle C. Perronnet,Piero Pianetta,William Rao,Frans J. M. Rietmeijer,François Robert,Detlef Rost,Alessandra Rotundi,R. E. Ryan,Scott A. Sandford,Craig S. Schwandt,Thomas H. See,D. J. Schlutter,J. Sheffield-Parker,Alexandre Simionovici,Steven B. Simon,I Sitnitsky,Christopher J. Snead,Maegan K. Spencer,Frank J. Stadermann,Andrew Steele,Thomas Stephan,Rhonda M. Stroud,Jean Susini,Stephen R. Sutton,Y Suzuki,Mitra L. Taheri,Susan Taylor,Nick Teslich,Kazu Tomeoka,Naotaka Tomioka,Alice Toppani,Josep M. Trigo-Rodríguez,David Troadec,Akira Tsuchiyama,Anthony J. Tuzzolino,Tolek Tyliszczak,Kentaro Uesugi,Michael A. Velbel,Joe Vellenga,Edward P. Vicenzi,Laszlo Vincze,J. Warren,Iris Weber,M. K. Weisberg,Andrew J. Westphal,Sue Wirick,Diane H. Wooden,Brigitte Wopenka,Penelope J. Wozniakiewicz,Ian Wright,Hikaru Yabuta,Hajime Yano,Edward D. Young,Richard N. Zare,Thomas J. Zega,Karen Ziegler,Laurent Zimmerman,Ernst Zinner,Michael E. Zolensky +185 more
TL;DR: The Stardust spacecraft collected thousands of particles from comet 81P/Wild 2 and returned them to Earth for laboratory study, and preliminary examination shows that the nonvolatile portion of the comet is an unequilibrated assortment of materials that have both presolar and solar system origin.
Journal ArticleDOI
Mineralogy and petrology of comet 81P/wild 2 nucleus samples
Michael E. Zolensky,Thomas J. Zega,Hajime Yano,Sue Wirick,Andrew J. Westphal,M. K. Weisberg,Iris Weber,J. Warren,Michael A. Velbel,Akira Tsuchiyama,Peter Tsou,Alice Toppani,Naotaka Tomioka,Kazushige Tomeoka,Nick Teslich,Mitra L. Taheri,Jean Susini,Rhonda M. Stroud,Thomas Stephan,Frank J. Stadermann,Christopher J. Snead,Steven B. Simon,Alexandre Simionovici,Thomas H. See,François Robert,Frans J. M. Rietmeijer,William Rao,Murielle C. Perronnet,D. A. Papanastassiou,Kyoko Okudaira,Kazumasa Ohsumi,Ichiro Ohnishi,Keiko Nakamura-Messenger,Tomoki Nakamura,Smail Mostefaoui,Takashi Mikouchi,Anders Meibom,Graciela Matrajt,Matthew A. Marcus,Hugues Leroux,Laurence Lemelle,Loan Le,Antonio Lanzirotti,Falko Langenhorst,Alexander N. Krot,Lindsay P. Keller,Anton T. Kearsley,David J. Joswiak,Damien Jacob,Hope A. Ishii,Ralph P. Harvey,Kenji Hagiya,Lawrence Grossman,Jeffrey N. Grossman,Giles A. Graham,Matthieu Gounelle,Philippe Gillet,Matthew J. Genge,George J. Flynn,T. Ferroir,Stewart Fallon,Denton S. Ebel,Zu Rong Dai,Patrick Cordier,Benton C. Clark,Miaofang Chi,Anna L. Butterworth,Donald E. Brownlee,John Bridges,Sean Brennan,Adrian J. Brearley,John P. Bradley,Pierre Bleuet,Phil Bland,Phil Bland,Ron K. Bastien +75 more
TL;DR: The bulk of the comet 81P/Wild 2 samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger ferromagnesian silicates, Fe-Ni sulfides,Fe-Ni metal, and accessory phases.
Journal ArticleDOI
Organics captured from comet 81P/Wild 2 by the Stardust spacecraft.
Scott A. Sandford,Jérôme Aléon,Conel M. O'd. Alexander,Tohru Araki,Sašaǎ Bajt,G. A. Baratta,Janet Borg,John P. Bradley,Donald E. Brownlee,John Robert Brucato,Mark J. Burchell,Henner Busemann,Anna L. Butterworth,Simon J. Clemett,George D. Cody,Luigi Colangeli,George Cooper,Louis Le Sergeant d'Hendecourt,Zahia Djouadi,Jason P. Dworkin,G. Ferrini,Holger Fleckenstein,George J. Flynn,Ian A. Franchi,Marc Fries,Mary K. Gilles,Daniel P. Glavin,Matthieu Gounelle,F. Grossemy,Chris Jacobsen,Lindsay P. Keller,A. L. David Kilcoyne,Jan Leitner,Graciela Matrajt,Anders Meibom,Vito Mennella,Smail Mostefaoui,Larry R. Nittler,Maria Elisabetta Palumbo,D. A. Papanastassiou,François Robert,Alessandra Rotundi,Christopher J. Snead,Maegan K. Spencer,Frank J. Stadermann,Andrew Steele,Thomas Stephan,Peter Tsou,Tolek Tyliszczak,Andrew J. Westphal,Sue Wirick,Brigitte Wopenka,Hikaru Yabuta,Richard N. Zare,Michael E. Zolensky +54 more
TL;DR: The presence of deuterium and nitrogen-15 excesses suggest that some organics have an interstellar/protostellar heritage and a diverse suite of organic compounds is present and identifiable within the returned samples.
Journal ArticleDOI
Isotopic Compositions of Cometary Matter Returned by Stardust
Kevin D. McKeegan,Jérôme Aléon,John P. Bradley,Donald E. Brownlee,Henner Busemann,Anna L. Butterworth,Marc Chaussidon,Stewart Fallon,Christine Floss,Jamie Gilmour,Matthieu Gounelle,Giles A. Graham,Yunbin Guan,Philipp R. Heck,Peter Hoppe,Ian D. Hutcheon,Joachim Huth,Hope A. Ishii,Motoo Ito,Stein B. Jacobsen,Anton T. Kearsley,Laurie A. Leshin,Ming-Chang Liu,Ian C. Lyon,Kuljeet K. Marhas,Bernard Marty,Graciela Matrajt,Anders Meibom,Scott Messenger,Smail Mostefaoui,Sujoy Mukhopadhyay,Keiko Nakamura-Messenger,Larry R. Nittler,Russ Palma,Russ Palma,Robert O. Pepin,D. A. Papanastassiou,François Robert,D. J. Schlutter,Christopher J. Snead,Frank J. Stadermann,Rhonda M. Stroud,Peter Tsou,Andrew J. Westphal,Edward D. Young,Karen Ziegler,Laurent Zimmermann,Ernst Zinner +47 more
TL;DR: Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild 2 particle fragments; however, extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials.
Journal ArticleDOI
Impact features on Stardust : implications for Comet 81P/Wild 2 dust
Friedrich Hörz,Ron K. Bastien,Janet Borg,John P. Bradley,John Bridges,Donald E. Brownlee,Mark J. Burchell,Miaofang Chi,Mark J. Cintala,Zu Rong Dai,Zahia Djouadi,Gerardo Dominguez,Thanasis E. Economou,Sam A. J. Fairey,Christine Floss,Ian A. Franchi,Giles A. Graham,Simon F. Green,Philipp R. Heck,Peter Hoppe,Joachim Huth,Hope A. Ishii,Anton T. Kearsley,Jochen Kissel,Jan Leitner,Hugues Leroux,Kuljeet K. Marhas,Keiko Messenger,Craig S. Schwandt,Thomas A. See,Christopher J. Snead,Frank J. Stadermann,Thomas Stephan,Rhonda M. Stroud,Nicholas Teslich,Josep M. Trigo-Rodríguez,Anthony J. Tuzzolino,David Troadec,Peter Tsou,J. Warren,Andrew J. Westphal,Penelope J. Wozniakiewicz,Ian Wright,Ernst Zinner +43 more
TL;DR: Particles emanating from comet 81P/Wild 2 collided with the Stardust spacecraft at 6.1 kilometers per second, producing hypervelocity impact features on the collector surfaces that were returned to Earth.