Results 91 to 100 of about 76,745 (212)

Exogenic basalt on asteroid (101955) Bennu

, 2020
When rubble-pile asteroid 2008 TC 3 impacted Earth on 7 October 2008, the recovered rock fragments indicated that such asteroids can contain exogenic material 1 , 2 .
D. Dellagiustina, H. Kaplan, A. Simon, William F. Bottke, Chrysa Avdellidou, Marco Delbo, Ronald-Louis Ballouz, D. Golish, K. Walsh, M. Popescu, Humberto Campins, M. Barucci, Giovanni Poggiali, R. Daly, L. Le Corre, V. Hamilton, N. Porter, Erica Jawin, T. J. McCoy, H. C. Connolly, J. L. Rizos Garcia, E. Tatsumi, J. de León, J. Licandro, S. Fornasier, Michael Daly, M. Al Asad, L. Philpott, J. Seabrook, Olivier S. Barnouin, B. E. Clark, M. Nolan, E. Howell, R. Binzel, B. Rizk, D. Reuter, D. Lauretta   +36 more
semanticscholar   +1 more source

One‐more‐vertex Next‐Event Estimation with Hierarchical Geometry Sampling

Computer Graphics Forum, EarlyView.
Abstract Robust next‐event estimation (NEE) remains a challenge in scenes characterized by sparse or small‐scale geometry where indirect illumination is the primary transport mechanism. In these scenes, traditional path construction, which relies on local directional sampling, often fails to find intersections with the sparse geometry, and standard NEE
Jorge Garcia‐Pueyo, Nestor Monzon, Adrian Jarabo, Adolfo Muñoz   +3 more
wiley   +1 more source

Episodes of particle ejection from the surface of the active asteroid (101955) Bennu

Science, 2019
Bennu ejects material from its surface Most asteroids appear inert, but remote observations show that a small number experience mass loss from their surfaces. Lauretta and Hergenrother et al.
D. Lauretta, C. Hergenrother, S. Chesley, J. Leonard, J. Y. Pelgrift, C. Adam, M. A. Al Asad, P. Antreasian, R.-L. Ballouz, K. Becker, C. Bennett, B. Bos, W. Bottke, M. Brozović, H. Campins, H. Connolly, M. Daly, A. Davis, J. de León, D. Dellagiustina, C. Y. Drouet d'Aubigny, J. Dworkin, J. Emery, D. Farnocchia, D. Glavin, D. R. Golish, C. M. Hartzell, R. Jacobson, E. R. Jawin, P. Jenniskens, J. Kidd, E. J. Lessac-Chenen, J.-Y. Li, G. Libourel, J. Licandro, A. J. Liounis, C. Maleszewski, C. Manzoni, B. May, L. McCarthy, J. McMahon, P. Michel, J. L. Molaro, M. Moreau, D. Nelson, W. Owen, B. Rizk, H. Roper, B. Rozitis, E. M. Sahr, D. Scheeres, J. Seabrook, S. Selznick, Y. Takahashi, F. Thuillet, P. Tricarico, D. Vokrouhlický, C. Wolner   +57 more
semanticscholar   +1 more source

Photochemical effects of Mars‐like UV irradiation on carboxylic acids in carbonaceous chondrites and expectations for abiotic background organics on Mars

Meteoritics &Planetary Science, EarlyView.
Abstract In the search for life on Mars, understanding the origin of preserved organics is critical. Expected sources include exogenous delivery, endogenous synthesis, and potentially life. Environmental processing by ultraviolet (UV) irradiation can alter these organics, obscuring hallmarks of their origin. To deconvolve these effects, we conducted an
D. K. Buckner, J. C. Aponte, A. C. Schuerger, D. I. Foustoukos, F. Seguin, M. B. Wilhelm, G. Cooper, A. J. Williams   +7 more
wiley   +1 more source

Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu

Nature Astronomy, 2019
C-type asteroids are among the most pristine objects in the Solar System, but little is known about their interior structure and surface properties. Telescopic thermal infrared observations have so far been interpreted in terms of a regolith-covered ...
M. Grott, J. Knollenberg, M. Hamm, K. Ogawa, R. Jaumann, K. Otto, M. Delbo', P. Michel, J. Biele, W. Neumann, M. Knapmeyer, E. Kuhrt, H. Senshu, T. Okada, J. Helbert, A. Maturilli, N. Müller, A. Hagermann, N. Sakatani, S. Tanaka, T. Arai, S. Mottola, S. Tachibana, I. Pelivan, L. Drube, J. Vincent, H. Yano, C. Pilorget, K. Matz, N. Schmitz, A. Koncz, S. Schröder, F. Trauthan, M. Schlotterer, C. Krause, T. Ho, A. Moussi-Soffys   +36 more
semanticscholar   +1 more source

Opportunities for asteroid retrieval missions [PDF]

, 2013
Asteroids and comets are of strategic importance for science in an effort to uncover the formation, evolution and composition of the Solar System. Near-Earth Objects (NEOs) are of particular interest because of their accessibility from Earth, but also ...
Daniel García Yárnoz, Sanchez Cuartielles, Joan-Pau, Colin R. McInnes, Garcia Yarnoz, Daniel, McInnes, Colin, Yárnoz, Daniel García, Joan-Pau Sanchez, McInnes, Colin R.   +7 more
core   +1 more source

Description and terrestrial ages of the Calama Area Meteorite Collection (Atacama Desert, Chile)

Meteoritics &Planetary Science, EarlyView.
Abstract We present a comprehensive study of a meteorite collection from the Atacama Desert (Chile), the driest and most climatically stable desert in the world. This collection includes meteorites from three adjacent Dense Collection Areas (DCAs) in the northern part of the Atacama Desert: Calama, Sierra Gorda, and Chug Chug, referred to as the ...
Carine Sadaka, Jérôme Gattacceca, Florian Dumas, Régis Braucher, ASTER Team, Matthieu Gounelle, Dilyara Kuzina, Cyril Lorenz, Alexandre Corgne, Pierre Sempéré   +9 more
wiley   +1 more source

Simulation of the Dual-Frequency Radar Image of Asteroid 2016 HO3 and Implication for Tianwen-2 Mission

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
In China's Tianwen-2 mission, a dual-frequency radar will be carried out to detect the asteroid 2016 HO3. The dual-frequency radar can acquire the information of the asteroid's surface and internal structure. There are few studies about the
Niutao Liu, Ya-Qiu Jin, Feng Xu
doaj   +1 more source

Post‐flight assessment of the OSIRIS‐REx Sample Return Capsule (SRC) for organic and other potential contaminants

Meteoritics &Planetary Science, EarlyView.
Abstract Regolith samples from the carbonaceous asteroid Bennu were stowed and delivered to Earth in the OSIRIS‐REx spacecraft's Sample Return Capsule (SRC). We applied multiple analytical techniques to study the components of the post‐flight SRC, with a focus on assessing the conditions and any contaminants to which the Bennu samples were exposed ...
Scott A. Sandford, Jason P. Dworkin, Kevin Righter, Feargus A. J. Abernethy, Romain Alosius, José C. Aponte, James Ball, Eve L. Berger, Denise K. Buckner, Henner Busemann, Simon J. Clemett, George Cody, Jamie Elsila, Dionysis I. Foustoukos, Ian A. Franchi, Daniel P. Glavin, Monica M. Grady, Heather V. Graham, Philipp R. Heck, Amy E. Hofmann, Yongsong Huang, Bumsoo Kim, Daniela Krietsch, Nicole G. Lunning, Colin Maden, Hannah L. McLain, Angel Mojarro, Michel Nuevo, Philippe Schmitt‐Kopplin, Ewerton Santos, Maria Schönbächler, Christopher J. Snead, Kathie L. Thomas‐Keprta, Alexander B. Verchovsky, Harold C. Connolly Jr., Dante S. Lauretta   +35 more
wiley   +1 more source

Assessment on the feasibility of future shepherding of asteroid resources [PDF]

, 2010
Most plausible futures for space exploration and exploitation require a large mass in Earth orbit. Delivering this mass requires overcoming the Earth's natural gravity well, which imposes a distinct obstacle to any future space venture.
Sanchez, J.P., McInnes, C.R.
core   +2 more sources