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No. 40. the System of Lunar Craters, Quadrant Ii Alice P
NO. 40. THE SYSTEM OF LUNAR CRATERS, QUADRANT II by D. W. G. ARTHUR, ALICE P. AGNIERAY, RUTH A. HORVATH ,tl l C.A. WOOD AND C. R. CHAPMAN \_9 (_ /_) March 14, 1964 ABSTRACT The designation, diameter, position, central-peak information, and state of completeness arc listed for each discernible crater in the second lunar quadrant with a diameter exceeding 3.5 km. The catalog contains more than 2,000 items and is illustrated by a map in 11 sections. his Communication is the second part of The However, since we also have suppressed many Greek System of Lunar Craters, which is a catalog in letters used by these authorities, there was need for four parts of all craters recognizable with reasonable some care in the incorporation of new letters to certainty on photographs and having diameters avoid confusion. Accordingly, the Greek letters greater than 3.5 kilometers. Thus it is a continua- added by us are always different from those that tion of Comm. LPL No. 30 of September 1963. The have been suppressed. Observers who wish may use format is the same except for some minor changes the omitted symbols of Blagg and Miiller without to improve clarity and legibility. The information in fear of ambiguity. the text of Comm. LPL No. 30 therefore applies to The photographic coverage of the second quad- this Communication also. rant is by no means uniform in quality, and certain Some of the minor changes mentioned above phases are not well represented. Thus for small cra- have been introduced because of the particular ters in certain longitudes there are no good determi- nature of the second lunar quadrant, most of which nations of the diameters, and our values are little is covered by the dark areas Mare Imbrium and better than rough estimates. -
Glossary Glossary
Glossary Glossary Albedo A measure of an object’s reflectivity. A pure white reflecting surface has an albedo of 1.0 (100%). A pitch-black, nonreflecting surface has an albedo of 0.0. The Moon is a fairly dark object with a combined albedo of 0.07 (reflecting 7% of the sunlight that falls upon it). The albedo range of the lunar maria is between 0.05 and 0.08. The brighter highlands have an albedo range from 0.09 to 0.15. Anorthosite Rocks rich in the mineral feldspar, making up much of the Moon’s bright highland regions. Aperture The diameter of a telescope’s objective lens or primary mirror. Apogee The point in the Moon’s orbit where it is furthest from the Earth. At apogee, the Moon can reach a maximum distance of 406,700 km from the Earth. Apollo The manned lunar program of the United States. Between July 1969 and December 1972, six Apollo missions landed on the Moon, allowing a total of 12 astronauts to explore its surface. Asteroid A minor planet. A large solid body of rock in orbit around the Sun. Banded crater A crater that displays dusky linear tracts on its inner walls and/or floor. 250 Basalt A dark, fine-grained volcanic rock, low in silicon, with a low viscosity. Basaltic material fills many of the Moon’s major basins, especially on the near side. Glossary Basin A very large circular impact structure (usually comprising multiple concentric rings) that usually displays some degree of flooding with lava. The largest and most conspicuous lava- flooded basins on the Moon are found on the near side, and most are filled to their outer edges with mare basalts. -
10Great Features for Moon Watchers
Sinus Aestuum is a lava pond hemming the Imbrium debris. Mare Orientale is another of the Moon’s large impact basins, Beginning observing On its eastern edge, dark volcanic material erupted explosively and possibly the youngest. Lunar scientists think it formed 170 along a rille. Although this region at first appears featureless, million years after Mare Imbrium. And although “Mare Orien- observe it at several different lunar phases and you’ll see the tale” translates to “Eastern Sea,” in 1961, the International dark area grow more apparent as the Sun climbs higher. Astronomical Union changed the way astronomers denote great features for Occupying a region below and a bit left of the Moon’s dead lunar directions. The result is that Mare Orientale now sits on center, Mare Nubium lies far from many lunar showpiece sites. the Moon’s western limb. From Earth we never see most of it. Look for it as the dark region above magnificent Tycho Crater. When you observe the Cauchy Domes, you’ll be looking at Yet this small region, where lava plains meet highlands, con- shield volcanoes that erupted from lunar vents. The lava cooled Moon watchers tains a variety of interesting geologic features — impact craters, slowly, so it had a chance to spread and form gentle slopes. 10Our natural satellite offers plenty of targets you can spot through any size telescope. lava-flooded plains, tectonic faulting, and debris from distant In a geologic sense, our Moon is now quiet. The only events by Michael E. Bakich impacts — that are great for telescopic exploring. -
Glossary of Lunar Terminology
Glossary of Lunar Terminology albedo A measure of the reflectivity of the Moon's gabbro A coarse crystalline rock, often found in the visible surface. The Moon's albedo averages 0.07, which lunar highlands, containing plagioclase and pyroxene. means that its surface reflects, on average, 7% of the Anorthositic gabbros contain 65-78% calcium feldspar. light falling on it. gardening The process by which the Moon's surface is anorthosite A coarse-grained rock, largely composed of mixed with deeper layers, mainly as a result of meteor calcium feldspar, common on the Moon. itic bombardment. basalt A type of fine-grained volcanic rock containing ghost crater (ruined crater) The faint outline that remains the minerals pyroxene and plagioclase (calcium of a lunar crater that has been largely erased by some feldspar). Mare basalts are rich in iron and titanium, later action, usually lava flooding. while highland basalts are high in aluminum. glacis A gently sloping bank; an old term for the outer breccia A rock composed of a matrix oflarger, angular slope of a crater's walls. stony fragments and a finer, binding component. graben A sunken area between faults. caldera A type of volcanic crater formed primarily by a highlands The Moon's lighter-colored regions, which sinking of its floor rather than by the ejection of lava. are higher than their surroundings and thus not central peak A mountainous landform at or near the covered by dark lavas. Most highland features are the center of certain lunar craters, possibly formed by an rims or central peaks of impact sites. -
USGS Open-File Report 2006-1263
Abstracts of the Annual Meeting of Planetary Geologic Mappers, Nampa, Idaho 2006 Edited By Tracy K.P. Gregg,1 Kenneth L. Tanaka,2 and R. Stephen Saunders3 Open-File Report 2006-1263 2006 Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY 1 The State University of New York at Buffalo, Department of Geology, 710 Natural Sciences Complex, Buffalo, NY 14260-3050. 2 U.S. Geological Survey, 2255 N. Gemini Drive, Flagstaff, AZ 86001. 3 NASA Headquarters, Office of Space Science, 300 E. Street SW, Washington, DC 20546. Report of the Annual Mappers Meeting Northwest Nazarene University Nampa, Idaho June 30 – July 2, 2006 Approximately 18 people attended this year’s mappers meeting, and many more submitted abstracts and maps in absentia. The meeting was held on the campus of Northwest Nazarene University (NNU), and was graciously hosted by NNU’s School of Health and Science. Planetary mapper Dr. Jim Zimbelman is an alumnus of NNU, and he was pivotal in organizing the meeting at this location. Oral and poster presentations were given on Friday, June 30. Drs. Bill Bonnichsen and Marty Godchaux led field excursions on July 1 and 2. USGS Astrogeology Team Chief Scientist Lisa Gaddis led the meeting with a brief discussion of the status of the planetary mapping program at USGS, and a more detailed description of the Lunar Mapping Program. She indicated that there is now a functioning website (http://astrogeology.usgs.gov/Projects/PlanetaryMapping/Lunar/) which shows which lunar quadrangles are available to be mapped. -
The Isabel Williamson Lunar Observing Program
The Isabel Williamson Lunar Observing Program by The RASC Observing Committee Revised Third Edition September 2015 © Copyright The Royal Astronomical Society of Canada. All Rights Reserved. TABLE OF CONTENTS FOR The Isabel Williamson Lunar Observing Program Foreword by David H. Levy vii Certificate Guidelines 1 Goals 1 Requirements 1 Program Organization 2 Equipment 2 Lunar Maps & Atlases 2 Resources 2 A Lunar Geographical Primer 3 Lunar History 3 Pre-Nectarian Era 3 Nectarian Era 3 Lower Imbrian Era 3 Upper Imbrian Era 3 Eratosthenian Era 3 Copernican Era 3 Inner Structure of the Moon 4 Crust 4 Lithosphere / Upper Mantle 4 Asthenosphere / Lower Mantle 4 Core 4 Lunar Surface Features 4 1. Impact Craters 4 Simple Craters 4 Intermediate Craters 4 Complex Craters 4 Basins 5 Secondary Craters 5 2. Main Crater Features 5 Rays 5 Ejecta Blankets 5 Central Peaks 5 Terraced Walls 5 ii Table of Contents 3. Volcanic Features 5 Domes 5 Rilles 5 Dark Mantling Materials 6 Caldera 6 4. Tectonic Features 6 Wrinkle Ridges 6 Faults or Rifts 6 Arcuate Rilles 6 Erosion & Destruction 6 Lunar Geographical Feature Names 7 Key to a Few Abbreviations Used 8 Libration 8 Observing Tips 8 Acknowledgements 9 Part One – Introducing the Moon 10 A – Lunar Phases and Orbital Motion 10 B – Major Basins (Maria) & Pickering Unaided Eye Scale 10 C – Ray System Extent 11 D – Crescent Moon Less than 24 Hours from New 11 E – Binocular & Unaided Eye Libration 11 Part Two – Main Observing List 12 1 – Mare Crisium – The “Sea of Cries” – 17.0 N, 70-50 E; -
Lunar Directions
A Digital Supplement to Astronomy Insights Astronomy Magazine Shoot the Moon How to Capture Stunning Lunar Detail with Modest Equipment April 2016 • Astronomy.com Moon-watching You should observe the Full Moon! Mountains and lava plains, rays, and a hint of color invite exploring a bright Moon. by Michael E. Bakich Anthony Ayiomamitis Anthony Observer 1: “It’s clear. Let’s set up the scope.” Observer 2: “Nah. It’s Full Moon.” Observer 1: “So, we’ll look at the Moon.” Perhaps the oddest ray system on the Moon Observer 2: “Are you nuts?” originates at the craters Messier and Messier A. I’m betting that if you haven’t had this rise as much as you can so you’re looking can reach 22 percent. Likewise, basalt has a conversation, you’ve gone through the gist through less of Earth’s image-distorting maximum of 2 percent of the mineral tita- of it in your mind. Observe at Full Moon? atmosphere. Also note that if the view is nium dioxide (TiO2) on Earth, whereas Observe what, exactly? The Moon’s intense uncomfortably bright, many manufacturers lunar basalt can contain up to 13 percent light scatters through the sky, essentially sell neutral density filters, which reduce the TiO2. Iron and titanium are dark materials eliminating every deep-sky object that’s not amount of light reaching your eyes but not and contribute to the overall murky appear- a double star. And you certainly don’t change it in any other way. ance of the maria. observe the Moon when it’s Full because Furthermore, because different lava that’s when the Sun lies highest in its sky on Explore the seas flows have different concentrations of these the part facing us, killing all details. -
Selenology Today 25
SELENOLOGY TODAY 25 NOVEMBER 2011 including the ongoing photographic lunar album by KC Pau 1. Introduction Selenology Today is devoted to the publication of contributions in the field of lunar studies. Manu- scripts reporting the results of new research con- cerning the astronomy, geology, physics, chemistry and other scientific aspects of Earth’s Moon are Editor-in-Chief: welcome. Selenology Today publishes papers devoted ex- R. Lena clusively to the Moon. Reviews, historical papers and manuscripts describing observing or space- craft instrumentation are considered. Editors: M.T. Bregante The Selenology Today J. Phillips Editorial Office C. Wöhler [email protected] C. Wood Cover KC PAU Selenology Issue 25 November 2011 SELENOLOGY TODAY #25 November 2011 Selenology Today website http://digilander.libero.it/glrgroup/ Humboldt: Concentric Crater and LPDs by H. Eskildsen and R. Lena………………………………………………..1 A photographic lunar album by KC Pau……………………………………………………………………………17 Study of a shallow dome near the lunar crater Autolycus by R. Lena, J. Phillips and P. Lazzarotti………………………………..36 Wallace and thedomes of “Mons Giraffe” by F. Corno………………………………………………………………………...51 Detection of two probable meteoroidal impacts on the Moon By M. Iten, R. Lena and S. Sposetti……………………………………….60 GEOLOGIC LUNAR RESEARCH SELENOLOGY TODAY 25 Humboldt: Concentric Crater and LPDs by H. Eskildsen (a) and R. Lena (b) (a) Association of Lunar and Planetary Observers, American Lunar Society, Alachua Astronomy Club (b) Geologic Lunar Research (GLR) group Abstract: The concentric crater in Humboldt falls in the typical range of diameter and ratio of inner to outer ring (Di/Do) for concentrics. The proximity of two much younger, non-concentric, craters similar in size to the concentric crater suggests that conditions causing the concentric crater formation no longer existed at the time of their impact. -
A Quiet Prelude I892-I9S7
f) 0 o () t) <t •I • A Quiet Prelude I892-I9S7 GILBERT This history could begin any time after the first human beings discerned a man, a maiden, or a rabbit on the Moon's face, but let us skip all the early studies that had only a peripheral influence on lunar geology in the Space Age.' Our modern line ofinquiry began in August 1892. People seem to need heroes, so let us consider Grove Karl Gilbert (1843 1918) of the U.S. Geological Survey. Gilbert was surely one of the greatest geologists who ever lived, and his genius touched almost all aspects of the sci ence : geomorphology, glaciology, sedimentation, structure, hydrology, and geo physics.' He was in Berkeley in April 1906 when he awoke early one morning "with unalloyed pleasure" at realizing that a vigorous earthquake was in prog ress, and he caught the first available ferry to San Francisco. He carefully re corded how long the subsequent fire took to consume the wooden buildings on Russian Hill (where I now live) and contributed major parts of the subsequent official report. I-lis personality seems to have been mild and subdued, even "saintlike," in an era of rough-hewn and feisty pioneers ofwestern geology. His recent biographer Stephen Pyne has applied to him the same term Gilbert applied to the Geological Survey: a great engine of research.3 In 189 I, while chief geologist of the Survey (the insider's term for the USGs), Gilbert was attracted by reports oflarge amounts ofmeteoritic iron, the Canyon Diablo meteorites, around a crater in Arizona then called Coon Mountain or Coon Butte.' Apparently he had already been thinking about the possible impact origin of lunar craters, and he alone realized that the Coon crater might itself be a "scar produced on the earth by the collision of a star." If so, a large iron meteorite might lie buried beneath the crater. -
Humboldt: Concentric Crater and Lpds by H
SELENOLOGY TODAY 25 NOVEMBER 2011 including the ongoing photographic lunar album by KC Pau 1. Introduction Selenology Today is devoted to the publication of contributions in the field of lunar studies. Manu- scripts reporting the results of new research con- cerning the astronomy, geology, physics, chemistry and other scientific aspects of Earth’s Moon are Editor-in-Chief: welcome. Selenology Today publishes papers devoted ex- R. Lena clusively to the Moon. Reviews, historical papers and manuscripts describing observing or space- craft instrumentation are considered. Editors: M.T. Bregante The Selenology Today J. Phillips Editorial Office C. Wöhler [email protected] C. Wood Cover KC PAU Selenology Issue 25 November 2011 SELENOLOGY TODAY #25 November 2011 Selenology Today website http://digilander.libero.it/glrgroup/ Humboldt: Concentric Crater and LPDs by H. Eskildsen and R. Lena………………………………………………..1 A photographic lunar album by KC Pau……………………………………………………………………………17 Study of a shallow dome near the lunar crater Autolycus by R. Lena, J. Phillips and P. Lazzarotti………………………………..36 Wallace and thedomes of “Mons Giraffe” by F. Corno………………………………………………………………………...51 Detection of two probable meteoroidal impacts on the Moon By M. Iten, R. Lena and S. Sposetti……………………………………….60 GEOLOGIC LUNAR RESEARCH SELENOLOGY TODAY 25 Humboldt: Concentric Crater and LPDs by H. Eskildsen (a) and R. Lena (b) (a) Association of Lunar and Planetary Observers, American Lunar Society, Alachua Astronomy Club (b) Geologic Lunar Research (GLR) group Abstract: The concentric crater in Humboldt falls in the typical range of diameter and ratio of inner to outer ring (Di/Do) for concentrics. The proximity of two much younger, non-concentric, craters similar in size to the concentric crater suggests that conditions causing the concentric crater formation no longer existed at the time of their impact. -
PHOTOMETRY Selenology Today#2
EDITORIAL Selenology Today#2 Many thanks for the positive comments sent to us by our readers, amateurs and professional scientists, for the first issue of Selenology Today. The primary goal of Selenology Today is to promote serious lunar research among dedicated amateur astronomers who are interested in observing and imaging the surface of the Moon as well as in its geologic history and the processes that formed its surface. In this scenario, a new opportunity is the impact of ESA's Smart-1. With a predicted date of September 03, the spacecraft will slam into the lunar surface in a dramatic culmination of its 18 month orbit around the Moon. The spacecraft is expected to crash onto the Moon's near side in Lacus Excellentiae, 10° south of Mare Humorum; the exact location and date will be refined closer to the date. It is likely that the impact flash and its plume of ejected material will be bright enough to be visible through amateur telescopes for a short period. However, the Moon will be well south of the ecliptic in the low constellation of Sagittarius on the date of impact, at least for Europe. Technical adjustments of the probe will be executed from the 26th of June until the beginning of August. Only after this date, a better estimate of the date of impact will be available, now calculated to occur on September 03 at 2:00 UT with +/- 7 hours uncertainty. In this impact project, as in many other astronomical international campaigns, the effective participation of amateur astronomers will be of high importance. -
The Research INSTITUTE Colieqe of PURE and Applied Sciences
RECEIVED- C j\NASA ST( FA OILI ~ CCESSD' lot --".< ThE RESEArch INSTITUTE COlIEqE of PURE ANd AppliEd SCiENCES Final Report NASA Planetology Grant NSG 7420 THICKNESS OF WESTERN MARE BASALTS Rene A. DeHon Department of Geosciences July 1979 t(NASA-CR-158,784) -THICKNESS OF WESTERN MARE . -N79-2810 BASALTS 'Final Report (jniersity of - Northeast Louisiana, 'Nonroe.) 65 p HTC A'4/F Aol CSC 035 -. -ica. ,G3/91 "29283 , NORThEAsT LoUiSiANA UNivERsiTY MONROE, LouisiANA 71209 NASA PLANETOLOGY GRANT NSG 7420 THICKNESS OF THE WESTERN MARE BASALTS Rene A. De Hon Department of Geosciences Northeast Louisiana University Monroe, LA 71209 July 15, 1979 ABSTRACT An isopach map of the basalt thickness in the western mare basins is constructed from measurements of the exposed external rim height of partially buried craters. The data, although numerically sparse, is sufficiently distributed to yield gross thickness variations. The average basalt thickness in Oceanus Procellarum and adjacent regions is 400 m with local lenses in excess of 1500 m in the circular maria. The total volume of basalt in the western maria is estimated to be in the range of 1.5 x 106km3 . Oceanus Procellarum and the western maria are largely composed of contiguous and superposed circular basins, The youngest basins are readily identified by a large number of basin-related features, Older basins retain progressively fewer identifying features. Mare Imbtium, Mare Humorum, and Mare Vaporum, and Sinus Medii are among those basins which retain a circular outline. Mare Cognitum and Mare Nubium are composite structures of contiguous basins, as is the Flamsteed-Reiner axis of thick basalts in western Oceanus Procellarum, Thick basalt lenses suggest the presence of older, nearly obliterated basins in the Stadius-Sinus Aestuum region as well as in east Oceanus Procellarum adjacent to southwest Mare Imbrium.