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Tubular Symplectic Inclusions in Olivine from the Fukang Pallasite
Meteoritics & Planetary Science 45, Nr 5, 899–910 (2010) doi: 10.1111/j.1945-5100.2010.01054.x Tubular symplectic inclusions in olivine from the Fukang pallasite Michael R. STEVENS1, David R. BELL1,2, and Peter R. BUSECK1,2* 1School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287, USA 2Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, USA *Corresponding author. E-mail: [email protected] (Received 11 June 2009; revision accepted 27 March 2010) Abstract–Olivine from the Fukang meteorite, like that from many other pallasites, contains distinctive arrays of parallel, straight, tubular inclusions. They differ in their extension and linearity from those in terrestrial olivines. They comprise approximately 1% of the total volume. Most have lens-shaped cross-sections, but some are rounded. The major axis of the lens-shaped inclusions is rigorously oriented along olivine [001], and the rounded ones lie along olivine [010] and a few along [100]. The linear nature and orientations of the inclusions suggest that they nucleated on screw dislocations, perhaps formed through shock triggering. High-resolution transmission electron microscopy (TEM) and energy-dispersive x-ray spectroscopy show that the inclusions consist of symplectic intergrowths of chromite, diopside, and silica that appear to have formed by exsolution from the host olivine. The symplectites consist of chromite lamellae with approximately 35-nm spacings that grew outward from a central plane, with interstitial diopside and silica. Contrast modulations having an average spacing of 4.4 nm occur within the chromite lamellae. Using a reaction- front model, we estimate that exsolution occurred over a period of 30 to 100 min, suggesting rapid cooling at high temperature. -
The Villalbeto De La Peña Meteorite Fall: II. Determination of Atmospheric Trajectory and Orbit
Meteoritics & Planetary Science 41, Nr 4, 505–517 (2006) Abstract available online at http://meteoritics.org The Villalbeto de la Peña meteorite fall: II. Determination of atmospheric trajectory and orbit Josep M. TRIGO-RODRÍGUEZ1, 2*, JiÚí BOROVIª.$3, Pavel SPURNÝ3, José L. ORTIZ4, José A. DOCOBO5, Alberto J. CASTRO-TIRADO4, and Jordi LLORCA2, 6 1Institut de Ciències de l’Espai (ICE-CSIC), Campus UAB, Facultat de Ciències, Torre C-5, parells, 2a planta, 08193 Bellaterra (Barcelona), Spain 2Institut d’Estudis Espacials de Catalunya (IEEC), Ed. Nexus, Gran Capità 2-4, 08034 Barcelona, Spain 3Astronomical Institute of the Academy of Sciences, OndÚHMRY2EVHUYDWRU\&]HFK5HSXEOLF 4Instituto de Astrofísica de Andalucía (IAA-CSIC), P.O. Box 3004, 18080 Granada, Spain 5Observatorio Astronómico Ramón Maria Aller, Universidade de Santiago de Compostela, Spain 6Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain *Corresponding author. E-mail: [email protected] (Received 23 April 2005; revision accepted 3 November 2005) Abstract–The L6 ordinary chondrite Villalbeto de la Peña fall occurred on January 4, 2004, at 16:46: 45 r 2 s UTC. The related daylight fireball was witnessed by thousands of people from Spain, Portugal, and southern France, and was also photographed and videotaped from different locations of León and Palencia provinces in Spain. From accurate astrometric calibrations of these records, we have determined the atmospheric trajectory of the meteoroid. The initial fireball velocity, calculated from measurements of 86 video frames, was 16.9 r 0.4 km/s. The slope of the trajectory was 29.0 r 0.6° to the horizontal, the recorded velocity during the main fragmentation at a height of 27.9 r 0.4 km was 14.2 r 0.2 km/s, and the fireball terminal height was 22.2 r 0.2 km. -
Zac Langdon-Pole
Zac Langdon-Pole Michael Lett 312 Karangahape Road Cnr K Rd & East St PO Box 68287 Newton Auckland 1145 New Zealand P+ 64 9 309 7848 [email protected] www.michaellett.com Zac Langdon-Pole Passport (Argonauta) (v) (front and side view) 2018 paper nautilus shell, Sericho meteorite (iron pallasite, landsite: Sericho, Kenya) 107 x 33 x 56mm ZL5210 Zac Langdon-Pole Residuals (c) 2018 Installation view, Between Bridges, Berlin February 2018 Zac Langdon-Pole Residuals (c) 2018 Installation view, Between Bridges, Berlin February 2018 Zac Langdon-Pole Ars Viva 2017/18 Installation view S.M.A.K., Ghent February 2018 Zac Langdon-Pole Ars Viva 2017/18 Installation view S.M.A.K., Ghent February 2018 Zac Langdon-Pole Ars Viva 2017/18 Installation view S.M.A.K., Ghent [offsite] February 2018 Zac Langdon-Pole Ars Viva 2017/18 Installation view S.M.A.K., Ghent February 2018 Zac Langdon-Pole Oratory Index Installation view Michael Lett, Auckland December 2016 Zac Langdon-Pole Oratory Index Installation view Michael Lett December 2016 Zac Langdon-Pole Installation view La Biennale de Montréal October 2016 Zac Langdon-Pole The Torture Garden 2016 framed digital print 620 x 490mm ZL4656 Zac Langdon-Pole 2017 Ars Viva 2018, Kunstverein München, Munich, Germany (group) Born 1988 Station, Melbourne, Australia (solo) Lives and works in Darmstadt and Berlin, Germany Vanished and Delft, Pah Homestead, Auckland, New Zealand (group) 2015 2016 Meisterschüler, Städelschule, Staatliche Hochschule für Bildende Künste. Prof. La Biennale de Montréal, Canada (group) -
Disequilibrium Melting and Melt Migration Driven by Impacts: Implications for Rapid Planetesimal Core Formation
Available online at www.sciencedirect.com Geochimica et Cosmochimica Acta 100 (2013) 41–59 www.elsevier.com/locate/gca Disequilibrium melting and melt migration driven by impacts: Implications for rapid planetesimal core formation Andrew G. Tomkins ⇑, Roberto F. Weinberg, Bruce F. Schaefer 1, Andrew Langendam School of Geosciences, P.O. Box 28E, Monash University, Melbourne, Victoria 3800, Australia Received 20 January 2012; accepted in revised form 24 September 2012; available online 12 October 2012 Abstract The e182W ages of magmatic iron meteorites are largely within error of the oldest solar system particles, apparently requir- ing a mechanism for segregation of metals to the cores of planetesimals within 1.5 million years of initial condensation. Cur- rently favoured models involve equilibrium melting and gravitational segregation in a static, quiescent environment, which requires very high early heat production in small bodies via decay of short-lived radionuclides. However, the rapid accretion needed to do this implies a violent early accretionary history, raising the question of whether attainment of equilibrium is a valid assumption. Since our use of the Hf–W isotopic system is predicated on achievement of chemical equilibrium during core formation, our understanding of the timing of this key early solar system process is dependent on our knowledge of the seg- regation mechanism. Here, we investigate impact-related textures and microstructures in chondritic meteorites, and show that impact-generated deformation promoted separation of liquid FeNi into enlarged sulfide-depleted accumulations, and that this happened under conditions of thermochemical disequilibrium. These observations imply that similar enlarged metal accumu- lations developed as the earliest planetesimals grew by rapid collisional accretion. -
Meteorologia
MINISTÉRIO DA DEFESA COMANDO DA AERONÁUTICA METEOROLOGIA ICA 105-1 DIVULGAÇÃO DE INFORMAÇÕES METEOROLÓGICAS 2006 MINISTÉRIO DA DEFESA COMANDO DA AERONÁUTICA DEPARTAMENTO DE CONTROLE DO ESPAÇO AÉREO METEOROLOGIA ICA 105-1 DIVULGAÇÃO DE INFORMAÇÕES METEOROLÓGICAS 2006 MINISTÉRIO DA DEFESA COMANDO DA AERONÁUTICA DEPARTAMENTO DE CONTROLE DO ESPAÇO AÉREO PORTARIA DECEA N° 15/SDOP, DE 25 DE JULHO DE 2006. Aprova a reedição da Instrução sobre Divulgação de Informações Meteorológicas. O CHEFE DO SUBDEPARTAMENTO DE OPERAÇÕES DO DEPARTAMENTO DE CONTROLE DO ESPAÇO AÉREO, no uso das atribuições que lhe confere o Artigo 1°, inciso IV, da Portaria DECEA n°136-T/DGCEA, de 28 de novembro de 2005, RESOLVE: Art. 1o Aprovar a reedição da ICA 105-1 “Divulgação de Informações Meteorológicas”, que com esta baixa. Art. 2o Esta Instrução entra em vigor em 1º de setembro de 2006. Art. 3o Revoga-se a Portaria DECEA nº 131/SDOP, de 1º de julho de 2003, publicada no Boletim Interno do DECEA nº 124, de 08 de julho de 2003. (a) Brig Ar RICARDO DA SILVA SERVAN Chefe do Subdepartamento de Operações do DECEA (Publicada no BCA nº 146, de 07 de agosto de 2006) MINISTÉRIO DA DEFESA COMANDO DA AERONÁUTICA DEPARTAMENTO DE CONTROLE DO ESPAÇO AÉREO PORTARIA DECEA N° 33 /SDOP, DE 13 DE SETEMBRO DE 2007. Aprova a edição da emenda à Instrução sobre Divulgação de Informações Meteorológicas. O CHEFE DO SUBDEPARTAMENTO DE OPERAÇÕES DO DEPARTAMENTO DE CONTROLE DO ESPAÇO AÉREO, no uso das atribuições que lhe confere o Artigo 1°, alínea g, da Portaria DECEA n°34-T/DGCEA, de 15 de março de 2007, RESOLVE: Art. -
Problems of Planetology, Cosmochemistry and Meteoritica Alexeev V.A., Ustinova G.K
Problems of Planetology… Problems of Planetology, Cosmochemistry and Meteoritica Alexeev V.A., Ustinova G.K. Meteoritic evidence radionuclides before the meteorite fall onto the Earth. The investigation of radionuclides with different T1/2 in the on peculiarities of the contemporary solar cycles chondrites with various dates of fall, which have various V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry extension and inclination of orbits, provides us with such RAS, Moscow long sequences of homogeneous data on variation of the Abstract. The meteorite data on monitoring of the intensity and GCR intensity and integral gradients (E >100 MeV) in the gradient of the galactic cosmic rays (GCR) in the heliosphere 3D heliosphere [Lavrukhina,Ustinova,1990]. The long during 5 solar cycles are used for the correlative analysis with the sequences of homogeneous data on the GCR intensity in variations of the solar activity (SA), strength of the interplanetary magnetic field (IMF) and tilt angle of the heliospheric current the stratosphere [Stozhkov et al., 2009] are used for sheet (HCS). The dependence of the GCR modulation depth in the evaluation of the gradients. Nowadays, such a sequence of 11-year solar cycles on the character of the solar magnetic field certain homogeneous data on the GCR intensity and (SMF) inversions in the heliosphere at the change of the 22-year gradients in the inner heliosphere covers ~5 solar cycles magnetic cycles is revealed. (see figure 1) [Alexeev, Ustinova, 2006]. This smoothes, Key words: galactic cosmic rays, solar modulation, solar cycles, to a considerable extent, both the temporal and spatial inversion of magnetic field, solar dynamo, climate. -
Lost Lake by Robert Verish
Meteorite-Times Magazine Contents by Editor Like Sign Up to see what your friends like. Featured Monthly Articles Accretion Desk by Martin Horejsi Jim’s Fragments by Jim Tobin Meteorite Market Trends by Michael Blood Bob’s Findings by Robert Verish IMCA Insights by The IMCA Team Micro Visions by John Kashuba Galactic Lore by Mike Gilmer Meteorite Calendar by Anne Black Meteorite of the Month by Michael Johnson Tektite of the Month by Editor Terms Of Use Materials contained in and linked to from this website do not necessarily reflect the views or opinions of The Meteorite Exchange, Inc., nor those of any person connected therewith. In no event shall The Meteorite Exchange, Inc. be responsible for, nor liable for, exposure to any such material in any form by any person or persons, whether written, graphic, audio or otherwise, presented on this or by any other website, web page or other cyber location linked to from this website. The Meteorite Exchange, Inc. does not endorse, edit nor hold any copyright interest in any material found on any website, web page or other cyber location linked to from this website. The Meteorite Exchange, Inc. shall not be held liable for any misinformation by any author, dealer and or seller. In no event will The Meteorite Exchange, Inc. be liable for any damages, including any loss of profits, lost savings, or any other commercial damage, including but not limited to special, consequential, or other damages arising out of this service. © Copyright 2002–2010 The Meteorite Exchange, Inc. All rights reserved. No reproduction of copyrighted material is allowed by any means without prior written permission of the copyright owner. -
March 21–25, 2016
FORTY-SEVENTH LUNAR AND PLANETARY SCIENCE CONFERENCE PROGRAM OF TECHNICAL SESSIONS MARCH 21–25, 2016 The Woodlands Waterway Marriott Hotel and Convention Center The Woodlands, Texas INSTITUTIONAL SUPPORT Universities Space Research Association Lunar and Planetary Institute National Aeronautics and Space Administration CONFERENCE CO-CHAIRS Stephen Mackwell, Lunar and Planetary Institute Eileen Stansbery, NASA Johnson Space Center PROGRAM COMMITTEE CHAIRS David Draper, NASA Johnson Space Center Walter Kiefer, Lunar and Planetary Institute PROGRAM COMMITTEE P. Doug Archer, NASA Johnson Space Center Nicolas LeCorvec, Lunar and Planetary Institute Katherine Bermingham, University of Maryland Yo Matsubara, Smithsonian Institute Janice Bishop, SETI and NASA Ames Research Center Francis McCubbin, NASA Johnson Space Center Jeremy Boyce, University of California, Los Angeles Andrew Needham, Carnegie Institution of Washington Lisa Danielson, NASA Johnson Space Center Lan-Anh Nguyen, NASA Johnson Space Center Deepak Dhingra, University of Idaho Paul Niles, NASA Johnson Space Center Stephen Elardo, Carnegie Institution of Washington Dorothy Oehler, NASA Johnson Space Center Marc Fries, NASA Johnson Space Center D. Alex Patthoff, Jet Propulsion Laboratory Cyrena Goodrich, Lunar and Planetary Institute Elizabeth Rampe, Aerodyne Industries, Jacobs JETS at John Gruener, NASA Johnson Space Center NASA Johnson Space Center Justin Hagerty, U.S. Geological Survey Carol Raymond, Jet Propulsion Laboratory Lindsay Hays, Jet Propulsion Laboratory Paul Schenk, -
Bez Tytu³u-2
BIULETYN MI£ONIKÓW METEORYTÓW METEORYT Nr 1 (25) Marzec 1998 W numerze: Jawor, Baszkówka, Mt Tazerzait, ¯elazo Pallasa Meteoryt Sikhote-Alin (105 g) bêd¹cy w³asnoci¹ miasta Lidzbarka Warmiñskiego. METEORYT 1/98 1 Od redaktora: Meteoryt biuletyn dla mi³o- ników meteorytów wydawany Wydarzeniem numeru jest rozwi¹zanie zagadki meteorytu przez Olsztyñskie Planetarium Jawor. Cudzys³ów podpowiada ju¿, ¿e wynik jest negatywny. Wro- i Obserwatorium Astronomicz- c³awscy naukowcy potrafili jednak dociec, czym jest kawa³ek ska³y ne, Muzeum Miko³aja Koper- le¿¹cy w muzeum w Jaworze z etykietk¹ meteoryt? i sk¹d do nika we Fromborku i Pallasite muzeum trafi³. Meteoryt czuje siê zaszczycony, ¿e to z jego ³amów Press wydawcê kwartalnika mo¿na siê o tym po raz pierwszy dowiedzieæ. Pe³ne opracowanie Meteorite! z którego pochodzi uka¿e siê w jednym z bardziej fachowych czasopism. wiêksza czêæ publikowanych Z nowym rokiem i z 25 numerem Meteoryt znów zmienia materia³ów. wygl¹d, co tradycyjnie jest zas³ug¹ Jacka Dr¹¿kowskiego. Z przy- Redaguje Andrzej S. Pilski jemnoci¹ odnotowujê te¿ powrót Micha³a Kosmulskiego do t³uma- czenia artyku³ów, oraz do³¹czenie siê Marka Muæka do grona t³uma- Sk³ad: Jacek Dr¹¿kowski czy i wspó³pracowników. Ronie te¿ grono czytelników, czyli nowy Druk: Jan, Lidzbark Warm. rok dobrze siê zapowiada. Adres redakcji: Dobrze zapowiada siê te¿ pozyskiwanie meteorytów dla kolekcjo- skr. poczt. 6, nerów, ale idzie to bardzo powoli. W kontaktach z zagranicznymi 14-530 Frombork, dealerami wystêpuje zjawisko znane naszym kolekcjonerom z kontak- tel. 0-55-243-7392. tów z ni¿ej podpisanym: wysy³a siê zamówienie i.. -
18Th EANA Conference European Astrobiology Network Association
18th EANA Conference European Astrobiology Network Association Abstract book 24-28 September 2018 Freie Universität Berlin, Germany Sponsors: Detectability of biosignatures in martian sedimentary systems A. H. Stevens1, A. McDonald2, and C. S. Cockell1 (1) UK Centre for Astrobiology, University of Edinburgh, UK ([email protected]) (2) Bioimaging Facility, School of Engineering, University of Edinburgh, UK Presentation: Tuesday 12:45-13:00 Session: Traces of life, biosignatures, life detection Abstract: Some of the most promising potential sampling sites for astrobiology are the numerous sedimentary areas on Mars such as those explored by MSL. As sedimentary systems have a high relative likelihood to have been habitable in the past and are known on Earth to preserve biosignatures well, the remains of martian sedimentary systems are an attractive target for exploration, for example by sample return caching rovers [1]. To learn how best to look for evidence of life in these environments, we must carefully understand their context. While recent measurements have raised the upper limit for organic carbon measured in martian sediments [2], our exploration to date shows no evidence for a terrestrial-like biosphere on Mars. We used an analogue of a martian mudstone (Y-Mars[3]) to investigate how best to look for biosignatures in martian sedimentary environments. The mudstone was inoculated with a relevant microbial community and cultured over several months under martian conditions to select for the most Mars-relevant microbes. We sequenced the microbial community over a number of transfers to try and understand what types microbes might be expected to exist in these environments and assess whether they might leave behind any specific biosignatures. -
Orbital Debris: a Chronology
NASA/TP-1999-208856 January 1999 Orbital Debris: A Chronology David S. F. Portree Houston, Texas Joseph P. Loftus, Jr Lwldon B. Johnson Space Center Houston, Texas David S. F. Portree is a freelance writer working in Houston_ Texas Contents List of Figures ................................................................................................................ iv Preface ........................................................................................................................... v Acknowledgments ......................................................................................................... vii Acronyms and Abbreviations ........................................................................................ ix The Chronology ............................................................................................................. 1 1961 ......................................................................................................................... 4 1962 ......................................................................................................................... 5 963 ......................................................................................................................... 5 964 ......................................................................................................................... 6 965 ......................................................................................................................... 6 966 ........................................................................................................................ -
Radar-Enabled Recovery of the Sutter's Mill Meteorite, A
RESEARCH ARTICLES the area (2). One meteorite fell at Sutter’sMill (SM), the gold discovery site that initiated the California Gold Rush. Two months after the fall, Radar-Enabled Recovery of the Sutter’s SM find numbers were assigned to the 77 me- teorites listed in table S3 (3), with a total mass of 943 g. The biggest meteorite is 205 g. Mill Meteorite, a Carbonaceous This is a tiny fraction of the pre-atmospheric mass, based on the kinetic energy derived from Chondrite Regolith Breccia infrasound records. Eyewitnesses reported hearing aloudboomfollowedbyadeeprumble.Infra- Peter Jenniskens,1,2* Marc D. Fries,3 Qing-Zhu Yin,4 Michael Zolensky,5 Alexander N. Krot,6 sound signals (table S2A) at stations I57US and 2 2 7 8 8,9 Scott A. Sandford, Derek Sears, Robert Beauford, Denton S. Ebel, Jon M. Friedrich, I56US of the International Monitoring System 6 4 4 10 Kazuhide Nagashima, Josh Wimpenny, Akane Yamakawa, Kunihiko Nishiizumi, (4), located ~770 and ~1080 km from the source, 11 12 10 13 Yasunori Hamajima, Marc W. Caffee, Kees C. Welten, Matthias Laubenstein, are consistent with stratospherically ducted ar- 14,15 14 14,15 16 Andrew M. Davis, Steven B. Simon, Philipp R. Heck, Edward D. Young, rivals (5). The combined average periods of all 17 18 18 19 20 Issaku E. Kohl, Mark H. Thiemens, Morgan H. Nunn, Takashi Mikouchi, Kenji Hagiya, phase-aligned stacked waveforms at each station 21 22 22 22 23 Kazumasa Ohsumi, Thomas A. Cahill, Jonathan A. Lawton, David Barnes, Andrew Steele, of 7.6 s correspond to a mean source energy of 24 4 24 2 25 Pierre Rochette, Kenneth L.