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  • Journal article
    Collins GS, Elbeshausen D, Davison TM, Robbins SJ, Hynek BMet al., 2011,

    The size-frequency distribution of elliptical impact craters

    , Earth and Planetary Science Letters, Vol: 310, Pages: 1-8, ISSN: 0012-821X
  • Journal article
    Ghail RC, Wilson C, Galand M, Hall D, Cochrane C, Mason P, Helbert J, MontMessin F, Limaye S, Patel M, Stam D, Wahlund J-E, Rocca F, Mather T, Waltham D, Genge M, Paillou P, Mitchell K, Wilson Let al., 2011,

    EnVision: taking the pulse of our twin planet

    , Experimental Astronomy: an international journal on astronomical instrumentation and data analysis

    EnVision is an ambitious but low-risk response to ESA’s call for a medium-size mission opportunity for a launch in 2022. Venus is the planet most similar to Earth in mass, bulk properties and orbital distance, but has evolved to become extremely hostile to life. EnVision’s 5-year mission objectives are to determine the nature of and rate of change caused by geological and atmospheric processes, to distinguish between competing theories about its evolution and to help predict the habitability of extrasolar planets. Three instrument suites will address specific surface, atmosphere and ionosphere science goals. The Surface Science Suite consists of a 2.2 m2 radar antenna with Interferometer, Radiometer and Altimeter operating modes, supported by a complementary IR surface emissivity mapper and an advanced accelerometer for orbit control and gravity mapping. This suite will determine topographic changes caused by volcanic, tectonic and atmospheric processes at rates as low as 1 mm a − 1. The Atmosphere Science Suite consists of a Doppler LIDAR for cloud top altitude, wind speed and mesospheric structure mapping, complemented by IR and UV spectrometers and a spectrophotopolarimeter, all designed to map the dynamic features and compositions of the clouds and middle atmosphere to identify the effects of volcanic and solar processes. The Ionosphere Science Suite uses a double Langmiur probe and vector magnetometer to understand the behaviour and long-term evolution of the ionosphere and induced magnetosphere. The suite also includes an interplanetary particle analyser to determine the delivery rate of water and other components to the atmosphere.
  • Conference paper
    Theis KJ, Schoenbaechler M, Benedix GK, Rehkaemper M, Andreasen Ret al., 2011,

    DATING CORE CRYSTALLIZATION OF IIAB AND IIIAB IRON METEORITES USING THE PALLADIUM-SILVER DECAY SYSTEM

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A234-A234, ISSN: 1086-9379
  • Conference paper
    Towner MC, Bland PA, Spurny P, Benedix GK, Dyl K, Greenwood RC, Gibson J, Franchi IA, Shrbeny L, Bevan AWR, Vaughan Det al., 2011,

    MASON GULLY: THE SECOND METEORITE RECOVERED BY THE DESERT FIREBALL NETWORK

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A238-A238, ISSN: 1086-9379
  • Conference paper
    Stephen NR, Benedix GK, Bland PA, 2011,

    EXTRACTING PYROXENE MINERAL SPECTRA FROM MARTIAN METEORITES

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY, Pages: A223-A223, ISSN: 1086-9379
  • Conference paper
    Spurny P, Bland PA, Shrbeny L, Towner MC, Borovicka J, Bevan AWR, Vaughan Det al., 2011,

    THE MASON GULLY METEORITE FALL IN SW AUSTRALIA: FIREBALL TRAJECTORY AND ORBIT FROM PHOTOGRAPHIC RECORDS

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A220-A220, ISSN: 1086-9379
  • Conference paper
    Palk CS, Rehkaemper M, Andreasen R, Stunt Aet al., 2011,

    EXTREME CADMIUM AND THALLIUM ISOTOPE FRACTIONATIONS IN ENSTATITE CHONDRITES

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A183-A183, ISSN: 1086-9379
  • Conference paper
    Miljkovic K, Mannick S, Collins GS, Bland PAet al., 2011,

    HYDROCODE SIMULATIONS OF BINARY ASTEROID IMPACTS

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A161-A161, ISSN: 1086-9379
  • Conference paper
    Huber L, Schoenbaechler M, Leya I, Wieler R, Theis KJ, Rehkaemper M, Benedix GKet al., 2011,

    THE IMPORTANCE OF COSMIC RAY EFFECTS FOR PALLADIUM-SILVER CHRONOMETRY IN IRON METEORITES: AN EVALUATION USING NOBLE GASES

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A104-A104, ISSN: 1086-9379
  • Conference paper
    Howard KT, Benedix GK, Bland PA, Schrader DLet al., 2011,

    MODAL MINERALOGY OF CR CHONDRITES BY PSD-XRD: ABUNDANCE OF AMORPHOUS Fe-SILICATE

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A102-A102, ISSN: 1086-9379
  • Conference paper
    Giscard MD, Hammond SJ, Benedix GK, Bland PA, Rogers NWet al., 2011,

    LA-ICPMS TRACE ELEMENT COMPOSITION OF METAL AND SULFIDE IN 3 ORDINARY CHONDRITE FALLS

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A78-A78, ISSN: 1086-9379
  • Conference paper
    Genge MJ, 2011,

    THE ATMOSPHERIC ENTRY OF I-TYPE SPHERULES

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A76-A76, ISSN: 1086-9379
  • Conference paper
    Dyl KA, Benedix GK, Bland PA, Towner MC, Spurny Pet al., 2011,

    METAMORPHISM IN THE NEWLY RECOVERED MASON GULLY (H5) ORDINARY CHONDRITE AND ITS CORRELATION TO ANOMALOUS PROPERTIES

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A61-A61, ISSN: 1086-9379
  • Conference paper
    Davison TM, Ciesla FJ, Collins GS, 2011,

    Quantification of the post-impact thermal evolution of planetesimals

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: Wiley-Blackwell, Pages: A53-A53, ISSN: 1086-9379
  • Conference paper
    Collins GS, Davison TM, Ciesla FJ, 2011,

    The effects of planetesimal collisions

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: Wiley-Blackwell, Pages: A46-A46, ISSN: 1086-9379
  • Conference paper
    Strashnov I, Bland PA, Spurny P, Towner MC, Gilmour JDet al., 2011,

    ULTRASENSITIVE DETERMINATION OF Kr-81-Kr COSMIC RAY EXPOSURE AGES OF EUCRITES AND BUNBURRA ROCKHOLE

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A226-A226, ISSN: 1086-9379
  • Conference paper
    Bland PA, Muxworthy AR, Collins GS, Moore J, Davison TM, Ciesla FJet al., 2011,

    Heterogeneous shock in porous chondrites: Implications for Allende magnetization

    , 74th Annual Meeting of the Meteoritical-Society, Publisher: Wiley-Blackwell, Pages: A22-A22, ISSN: 1086-9379
  • Journal article
    Wozniakiewicz PJ, Ishii HA, Kearsley AT, Burchell MJ, Bland PA, Bradley JP, Dai Z, Teslich N, Collins GS, Cole MJ, Russell SSet al., 2011,

    Investigation of iron sulfide impact crater residues: A combined analysis by scanning and transmission electron microscopy

    , METEORITICS & PLANETARY SCIENCE, Vol: 46, Pages: 1007-1024, ISSN: 1086-9379
  • Journal article
    Collins GS, Melosh HJ, Wunnemann K, 2011,

    Improvements to the epsilon-alpha porous compaction model for simulating impacts into high-porosity solar system objects

    , INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, Vol: 38, Pages: 434-439, ISSN: 0734-743X

    We describe improvements to the epsilon-alpha porous compaction model for simulating solar system impacts. To improve the treatment of highly porous materials, we modified the epsilon-alpha model to account for thermal expansion of the matrix during compaction. We validated the improved model by demonstrating good agreement between numerically computed Hugoniot curves for porous iron (up to initial porosities of similar to 80%) using the improved epsilon-alpha model and experimentally-derived Hugoniot data. Moreover, we verified that the model improvements are easily implemented into a hydrocode and preserve the efficiency advantage of a strain-based compaction function. We used the improved epsilon-alpha porous compaction model in the iSALE hydrocode to reproduce 2-km/s porous-target laboratory impact experiments. The simulation results were in qualitative agreement with the experiments but produced craters that were consistently deeper and larger in volume than the experiments. The results of the hydrocode simulations and laboratory experiments show a reduction in crater efficiency with increasing porosity. This reduction is more dramatic if the impactor density and velocity are higher. (C) 2010 Elsevier Ltd. All rights reserved.
  • Journal article
    Howard KT, Benedix GK, Bland PA, Cressey Get al., 2011,

    Modal mineralogy of CM chondrites by X-ray diffraction (PSD-XRD): Part 2. Degree, nature and settings of aqueous alteration

    , GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 75, Pages: 2735-2751, ISSN: 0016-7037

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