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Phobos, Deimos: Formation and Evolution Alex Soumbatov-Gur
Phobos, Deimos: Formation and Evolution Alex Soumbatov-Gur To cite this version: Alex Soumbatov-Gur. Phobos, Deimos: Formation and Evolution. [Research Report] Karpov institute of physical chemistry. 2019. hal-02147461 HAL Id: hal-02147461 https://hal.archives-ouvertes.fr/hal-02147461 Submitted on 4 Jun 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Phobos, Deimos: Formation and Evolution Alex Soumbatov-Gur The moons are confirmed to be ejected parts of Mars’ crust. After explosive throwing out as cone-like rocks they plastically evolved with density decays and materials transformations. Their expansion evolutions were accompanied by global ruptures and small scale rock ejections with concurrent crater formations. The scenario reconciles orbital and physical parameters of the moons. It coherently explains dozens of their properties including spectra, appearances, size differences, crater locations, fracture symmetries, orbits, evolution trends, geologic activity, Phobos’ grooves, mechanism of their origin, etc. The ejective approach is also discussed in the context of observational data on near-Earth asteroids, main belt asteroids Steins, Vesta, and Mars. The approach incorporates known fission mechanism of formation of miniature asteroids, logically accounts for its outliers, and naturally explains formations of small celestial bodies of various sizes. -
Planetary Nomenclature: an Overview and Update
3rd Planetary Data Workshop 2017 (LPI Contrib. No. 1986) 7119.pdf PLANETARY NOMENCLATURE: AN OVERVIEW AND UPDATE. T. Gaither1, R. K. Hayward1, J. Blue1, L. Gaddis1, R. Schulz2, K. Aksnes3, G. Burba4, G. Consolmagno5, R. M. C. Lopes6, P. Masson7, W. Sheehan8, B.A. Smith9, G. Williams10, C. Wood11, 1USGS Astrogeology Science Center, Flagstaff, Ar- izona ([email protected]); 2ESA Scientific Support Office, Noordwijk, The Netherlands; 3Institute for Theoretical Astrophysics, Oslo, Norway; 4Vernadsky Institute, Moscow, Russia; 5Specola Vaticana, Vati- can City State; 6Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California; 7Uni- versite de Paris-Sud, Orsay, France; 8Lowell Observatory, Flagstaff, Arizona; 9Santa Fe, New Mexico; 10Minor Planet Center, Cambridge, Massachusetts; 11Planetary Science Institute, Tucson, Arizona. Introduction: The task of naming planetary Asteroids surface features, rings, and natural satellites is Ceres 113 managed by the International Astronomical Un- Dactyl 2 ion’s (IAU) Working Group for Planetary System Eros 41 Nomenclature (WGPSN). The members of the Gaspra 34 WGPSN and its task groups have worked since the Ida 25 early 1970s to provide a clear, unambiguous sys- Itokawa 17 tem of planetary nomenclature that represents cul- Lutetia 37 tures and countries from all regions of Earth. Mathilde 23 WGPSN members include Rita Schulz (chair) and Steins 24 9 other members representing countries around the Vesta 106 globe (see author list). In 2013, Blue et al. [1] pre- Jupiter sented an overview of planetary nomenclature, and Amalthea 4 in 2016 Hayward et al. [2] provided an update to Thebe 1 this overview. Given the extensive planetary ex- Io 224 ploration and research that has taken place since Europa 111 2013, it is time to update the community on the sta- Ganymede 195 tus of planetary nomenclature, the purpose and Callisto 153 rules, the process for submitting name requests, and the IAU approval process. -
Evidence for Thermal-Stress-Induced Rockfalls on Mars Impact Crater Slopes
Icarus 342 (2020) 113503 Contents lists available at ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus Evidence for thermal-stress-induced rockfalls on Mars impact crater slopes P.-A. Tesson a,b,*, S.J. Conway b, N. Mangold b, J. Ciazela a, S.R. Lewis c, D. M�ege a a Space Research Centre, Polish Academy of Science, Wrocław, Poland b Laboratoire de Plan�etologie et G�eodynamique UMR 6112, CNRS, Nantes, France c School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK ARTICLE INFO ABSTRACT Keywords: Here we study rocks falling from exposed outcrops of bedrock, which have left tracks on the slope over which Mars, surface they have bounced and/or rolled, in fresh impact craters (1–10 km in diameter) on Mars. The presence of these Thermal stress tracks shows that these rocks have fallen relatively recently because aeolian processes are known to infill Ices topographic lows over time. Mapping of rockfall tracks indicate trends in frequency with orientation, which in Solar radiation � � turn depend on the latitudinal position of the crater. Craters in the equatorial belt (between 15 N and 15 S) Weathering exhibit higher frequencies of rockfall on their north-south oriented slopes compared to their east-west ones. � Craters >15 N/S have notably higher frequencies on their equator-facing slopes as opposed to the other ori entations. We computed solar radiation on the surface of crater slopes to compare insolation patterns with the spatial distribution of rockfalls, and found statistically significant correlations between maximum diurnal inso lation and rockfall frequency. -
Companion Q&A Fact Sheet: What Mars Reveals About Life in Our
What Mars Reveals about Life in Our Universe Companion Q&A Fact Sheet Educators from the Smithsonian’s Air and Space and Natural History Museums assembled this collection of commonly asked questions about Mars to complement the Smithsonian Science How webinar broadcast on March 3, 2021, “What Mars Reveals about Life in our Universe.” Continue to explore Mars and your own curiosities with these facts and additional resources: • NASA: Mars Overview • NASA: Mars Robotic Missions • National Air and Space Museum on the Smithsonian Learning Lab: “Wondering About Astronomy Together” Guide • National Museum of Natural History: A collection of resources for teaching about Antarctic Meteorites and Mars 1 • Smithsonian Science How: “What Mars Reveals about Life in our Universe” with experts Cari Corrigan, L. Miché Aaron, and Mariah Baker (aired March 3, 2021) Mars Overview How long is Mars’ day? Mars takes 24 hours and 38 minutes to spin around once, so its day is very similar to Earth’s. How long is Mars’ year? Mars takes 687 days, almost two Earth years, to complete one orbit around the Sun. How far is Mars from Earth? The distance between Earth and Mars changes as both planets move around the Sun in their orbits. At its closest, Mars is just 34 million miles from the Earth; that’s about one third of Earth’s distance from the Sun. On the day of this program, March 3, 2021, Mars was about 135 million miles away, or four times its closest distance. How far is Mars from the Sun? Mars orbits an average of 141 million miles from the Sun, which is about one-and-a-half times as far as the Earth is from the Sun. -
Mapping of Inner and Outer Celestial Bodies Using New Global and Local Topographic Data Derived from Photogrammetric Image Processing
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLI-B4, 2016 XXIII ISPRS Congress, 12–19 July 2016, Prague, Czech Republic Mapping of inner and outer celestial bodies using new global and local topographic data derived from photogrammetric image processing I.P. Karachevtsevaa*, A.A. Kokhanova, J.F. Rodionovaa,b, A.Yu. Zharkovaa,, M.S. Lazarevaa aMoscow State University of Geodesy and Cartography (MIIGAiK), MIIGAiK Extraterrestrial laboratory (MExLab), 105064. Gorokhovsky per., Moscow, Russia [email protected] bSternberg State Astronomical Institute, 1198993, Moscow, Russia Commission IV, WG IV/8 KEY WORDS: Planetary cartography, DEM, geomorphology study, Phobos, the Moon, Mercury, Ganymede and Enceladus ABSTRACT: New estimation of fundamental geodetic parameters and global and local topography of planets and satellites provide basic coordinate systems for mapping as well as opportunities for studies of processes on their surfaces. The main targets of our study are Europa, Ganymede, Calisto and Io (satellites of Jupiter), Enceladus (a satellite of Saturn), terrestrial planetary bodies, including Mercury, the Moon and Phobos, one of the Martian satellites. In particular, based on new global shape models derived from three-dimensional control point networks and processing of high-resolution stereo images, we have carried out studies of topography and morphology. As a visual representation of the results, various planetary maps with different scale and thematic direction were created. For example, for Phobos we have produced a new atlas with 43 maps, as well as various wall maps (different from the maps in the atlas by their format and design): basemap, topography and geomorphological maps. In addition, we compiled geomorphologic maps of Ganymede on local level, and a global hypsometric Enceladus map. -
Physical Changes
How Matter Changes By Cindy Grigg Changes in matter happen around you every day. Some changes make matter look different. Other changes make one kind of matter become another kind of matter. When you scrunch a sheet of paper up into a ball, it is still paper. It only changed shape. You can cut a large, rectangular piece of paper into many small triangles. It changed shape and size, but it is still paper. These kinds of changes are called physical changes. Physical changes are changes in the way matter looks. Changes in size and shape, like the changes in the cut pieces of paper, are physical changes. Physical changes are changes in the size, shape, state, or appearance of matter. Another kind of physical change happens when matter changes from one state to another state. When water freezes and makes ice, it is still water. It has only changed its state of matter from a liquid to a solid. It has changed its appearance and shape, but it is still water. You can change the ice back into water by letting it melt. Matter looks different when it changes states, but it stays the same kind of matter. Solids like ice can change into liquids. Heat speeds up the moving particles in ice. The particles move apart. Heat melts ice and changes it to liquid water. Metals can be changed from a solid to a liquid state also. Metals must be heated to a high temperature to melt. Melting is changing from a solid state to a liquid state. -
I Identification and Characterization of Martian Acid-Sulfate Hydrothermal
Identification and Characterization of Martian Acid-Sulfate Hydrothermal Alteration: An Investigation of Instrumentation Techniques and Geochemical Processes Through Laboratory Experiments and Terrestrial Analog Studies by Sarah Rose Black B.A., State University of New York at Buffalo, 2004 M.S., State University of New York at Buffalo, 2006 A thesis submitted to the Faculty of the Graduate School of the University of Colorado in partial fulfillment of the requirement for the degree of Doctor of Philosophy Department of Geological Sciences 2018 i This thesis entitled: Identification and Characterization of Martian Acid-Sulfate Hydrothermal Alteration: An Investigation of Instrumentation Techniques and Geochemical Processes Through Laboratory Experiments and Terrestrial Analog Studies written by Sarah Rose Black has been approved for the Department of Geological Sciences ______________________________________ Dr. Brian M. Hynek ______________________________________ Dr. Alexis Templeton ______________________________________ Dr. Stephen Mojzsis ______________________________________ Dr. Thomas McCollom ______________________________________ Dr. Raina Gough Date: _________________________ The final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. ii Black, Sarah Rose (Ph.D., Geological Sciences) Identification and Characterization of Martian Acid-Sulfate Hydrothermal Alteration: An Investigation -
Cosmic Microwave Background
1 29. Cosmic Microwave Background 29. Cosmic Microwave Background Revised August 2019 by D. Scott (U. of British Columbia) and G.F. Smoot (HKUST; Paris U.; UC Berkeley; LBNL). 29.1 Introduction The energy content in electromagnetic radiation from beyond our Galaxy is dominated by the cosmic microwave background (CMB), discovered in 1965 [1]. The spectrum of the CMB is well described by a blackbody function with T = 2.7255 K. This spectral form is a main supporting pillar of the hot Big Bang model for the Universe. The lack of any observed deviations from a 7 blackbody spectrum constrains physical processes over cosmic history at redshifts z ∼< 10 (see earlier versions of this review). Currently the key CMB observable is the angular variation in temperature (or intensity) corre- lations, and to a growing extent polarization [2–4]. Since the first detection of these anisotropies by the Cosmic Background Explorer (COBE) satellite [5], there has been intense activity to map the sky at increasing levels of sensitivity and angular resolution by ground-based and balloon-borne measurements. These were joined in 2003 by the first results from NASA’s Wilkinson Microwave Anisotropy Probe (WMAP)[6], which were improved upon by analyses of data added every 2 years, culminating in the 9-year results [7]. In 2013 we had the first results [8] from the third generation CMB satellite, ESA’s Planck mission [9,10], which were enhanced by results from the 2015 Planck data release [11, 12], and then the final 2018 Planck data release [13, 14]. Additionally, CMB an- isotropies have been extended to smaller angular scales by ground-based experiments, particularly the Atacama Cosmology Telescope (ACT) [15] and the South Pole Telescope (SPT) [16]. -
Master's Thesis Master's Thesis
2010:056 CIV 2010:056 CIV MASTEMASTER’SR’S THESIS THESIS2010:056 CIV MASTER’S THESIS The Seasonal Behaviour of Ice and 2010:056 CIV Features in Craters at the The SeasonalMASTE BehaviourR’S THESIS of Ice and NorthernFeatures Polar in Craters Region at of the Mars Northern Polar Region of Mars The Seasonal Behaviour of Ice and Features in Craters at the Northern Polar Region of Mars Mitra Hajigholi Mitra Hajigholi MASTER OF SCIENCE PROGRAMME SpaceMitra Engineering Hajigholi MASTERLuleå OF University SCIENCE of Technology PROGRAMME Department of AppliedSpace Physics Engineering and Mechanical Engineering MASTER DivisionOF SCIENCE of Physics PROGRAMME Luleå UniversitySpace Engineering of Technology Universitetstryckeriet, Luleå Department#)6s)33. s)32.,45 %8 3% of Applied Physics and Mechanical Engineering Luleå University of Technology Division of Physics Department of Applied Physics and Mechanical Engineering Universitetstryckeriet, Luleå Division of Physics #)6s)33. s)32.,45 %8 3% Universitetstryckeriet, Luleå #)6s)33. s)32.,45 %8 3% Preface This report is the diploma thesis for a Master of Science in the Space Engineering Pro- gramme at Luleå University of Technology. It is the result of an internship at NASA Ames Research Center in California between October and January 2009/2010. It was possible due to a collaboration initiated by Luleå University of Technology. This thesis project was directed under Dr. Chris P. McKay (scientist at NASA Ames Research Center) and supervised by Dr. Adrian Brown (post-doc at SETI), who presented the idea upon which this project is based. I and my fellow student, Angelique Bertilsson, from Luleå University of Technology have worked side by side on this project. -
The Temperature of the Cosmic Microwave Background at 10 Ghz D
The Astrophysical Journal, 612:86–95, 2004 September 1 # 2004. The American Astronomical Society. All rights reserved. Printed in U.S.A. THE TEMPERATURE OF THE COSMIC MICROWAVE BACKGROUND AT 10 GHZ D. J. Fixsen,1 A. Kogut,2 S. Levin,3 M. Limon,1 P. Lubin,4 P. Mirel,1 M. Seiffert,3 and E. Wollack2 Received 2004 February 23; accepted 2004 April 14 ABSTRACT We report the results of an effort to measure the low-frequency portion of the spectrum of the cosmic microwave background (CMB) radiation, using a balloon-borne instrument called the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE). These measurements are to search for deviations from a thermal spectrum that are expected to exist in the CMB as a result of various processes in the early universe. The radiometric temperature was measured at 10 and 30 GHz using a cryogenic open-aperture instrument with no emissive windows. An external blackbody calibrator provides an in situ reference. Systematic errors were greatly reduced by using differential radiometers and cooling all critical components to physical temperatures approxi- mating the antenna temperature of the sky. A linear model is used to compare the radiometer output to a set of thermometers on the instrument. The unmodeled residualsarelessthan50mKpeaktopeakwithaweightedrms of 6 mK. Small corrections are made for the residual emission from the flight train, atmosphere, and foreground Galactic emission. The measured radiometric temperature of the CMB is 2:721 Æ 0:010 K at 10 GHz and 2:694 Æ 0:032 K at 30 GHz. Subject headinggs: cosmic microwave background — cosmology: observations 1. -
Extreme Cold Is a Dangerous Situation That Can Bring on Bring Can That Situation Dangerous a Is Cold Extreme
Centers for Disease Control and Prevention and Control Disease for Centers U.S. Department of Health And Human Services Human And Health of Department U.S. U.S. Department of Health And Human Services Centers for Disease Control and Prevention http://www.bt.cdc.gov/disasters/winter/ 1-888-232-6789; [email protected] 1-888-232-6789; 4700 Buford Hwy, Atlanta, GA 30341-3717 GA Atlanta, Hwy, Buford 4700 National Center for Environmental Health, MS F52 MS Health, Environmental for Center National Centers for Disease Control and Prevention and Control Disease for Centers or more information on cold weather conditions and health, please contact: please health, and conditions weather cold on information more or F For more information on hot weather conditions and health, please contact: Centers for Disease Control and Prevention National Center for Environmental Health, MS F52 4700 Buford Hwy, Atlanta, GA 30341-3717 1-888-232-6789; [email protected] http://www.bt.cdc.gov/disasters/extremeheat/ 1 and what to do if a cold-weather health emergency arises. arises. emergency health cold-weather a if do to what and should know how to prevent cold-related health problems health cold-related prevent to how know should that is poorly insulated or without heat. without or insulated poorly is that can be affected. To keep yourself and your family safe, you safe, family your and yourself keep To affected. be can without shelter or who are stranded, or who live in a home a in live who or stranded, are who or shelter without Infants and the elderly are particularly at risk, but anyone but risk, at particularly are elderly the and Infants health emergencies in susceptible people, such as those as such people, susceptible in emergencies health can cause other serious or life-threatening health problems. -
Cold-To-Warm Flow Regime Transition in Snow Avalanches
Cold-to-warm flow regime transition in snow avalanches Köhler Anselm1,2, Fischer Jan-Thomas2, Scandroglio Riccardo1, Bavay Mathias1, McElwaine Jim3, and Sovilla Betty1 1WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland 2Austrian Research Centre for Forests (BFW), Innsbruck, Austria 3Department of Earth Sciences, Durham University, Durham, UK Correspondence to: Anselm Köhler, [email protected] Abstract. Large avalanches usually encounter different snow conditions along their track. When they release as slab avalanches comprising cold snow, they can subsequently develop into powder snow avalanches entraining snow as they move down the mountain. Typically, this entrained snow will be cold (T < −1 ◦C) at high elevations near the surface, but warm (T > −1 ◦C) at lower elevations or deeper in the snow pack. The intake of warm snow is believed to be of major importance to increase the 5 temperature of the snow composition in the avalanche and eventually cause a flow regime transition. Measurements of flow regime transitions are performed at the Vallée de la Sionne avalanche test site in Switzerland using two different radar systems. The data are then combined with snow temperatures calculated with the snow cover model SNOWPACK. We define transitions as complete, when the deposit at runout is characterized only by warm snow, or as partial, if there is a warm flow regime but the farthest deposit is characterized by cold snow. We introduce a transition index Ft, based on the runout of cold and warm flow 10 regimes, as a measure to quantify the transition type. Finally, we parameterize the snow cover temperature along the avalanche track by the altitude Hs, which represents the point where the average temperature of the uppermost 0:5 m changes from cold to warm.