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May 2021 the Lunar Observer by the Numbers

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A Publication of the Lunar Section of ALPO Edited by David Teske: [email protected] 2162 Enon Road, Louisville, Mississippi, USA Back issues: http://www.alpo-astronomy.org/ Online readers, May 2021 click on images In This Issue for hyperlinks Observations Received 2 By the Numbers 4 Stöfler and Maurolycus Region, H. Eskildsen 5 North-ish, R. Hill 6 Medii to Delaunay and a Concentric Crater, H. Eskildsen 7 The Greatest Crater? R. Hill 8 The Glorious Rupes Cauchy, A. Anunziato 9 The Western Chain on the Eastern Moon, H. Eskildsen 10 A Scarp by any Other Name, R. Hill 11 Mädlers Bright Streak, Ray or Elevation? A. Anunziato 12 Caucasus to Mare Vaporum, Close-Up Images of Aristillus, Autolycus and Putredinis Domes, H. Eskildsen 15 Images of Crater Schickard, J. D. Sabia 17 Another Trio, R. Hill 18 Mare Vaporum to Sinus Medii and Associated Domes, H. Eskildsen 19 Focus-On: The Lunar 100 Features 61-70, J. Hubbell 21 Lunar 61-70, A. Anunziato 24 Mösting A, R. H. Hays, Jr. 26 Hortensius and Domes, R. H. Hays, Jr. 53 Mare Humboldtianum, the Other Multi-Ring Lunar Basin, D. Teske 75 Recent Lunar Topographic Studies 81 Lunar Geologic Change Detection Program, T. Cook 100 ALPO 2021 Conference News 108 Lunar Calendar May 2021 110 An Invitation to Join ALPO 110 Submission Through the ALPO Image Achieve 111 When Submitting Observations to the ALPO Lunar Section 112 Call For Observations Focus-On 112 Focus-On Announcement 113 Key to Images in this Issue 114 The May issue of The Lunar Observer features a number of interesting articles by Howard Eskildsen, Rob- ert H. Hays, Jr., Rik Hill, Alberto Anunziato, John D. Sabia and David Teske. Jerry Hubbell and Alberto Anunziato tackle the Lunar 100 numbers 61-70 with a number of great images, drawings, paints and arti- cles. Observers from 10 countries contributed to this issue of The Lunar Observer! Tony Cook keeps us abreast on Lunar Geologic Change, as always with interesting reports. Take a look at just what is in one lunar image. Howard Eskildsen finds a “new” concentric crater (page 7). Who knows what you will find! Clear and steady skies. The Lunar Observer/May 2021/ 1 Lunar Topographic Studies Coordinator – David Teske - [email protected] Assistant Coordinator– Alberto Anunziato [email protected] Assistant Coordinator – William Dembowski - [email protected] Assistant Coordinator – Jerry Hubbell – [email protected] Assistant Coordinator-Wayne Bailey– [email protected] Website: http://www.alpo-astronomy.org/ Observations Received Name Location and Organization Image/Article Alberto Anunziato Paraná, Argentina Article and drawing The Glorious Rupes Cauchy, Mädler’s Bright Streak: Ray or Elevation, Lunar 61- 70, drawings of Rümker, Sergio Babino Montevideo, Uruguay, SAO- Image of Mädler, Descartes, Hor- LIADA tensius Domes, Copernicus and Mare Humboldtianum. Juan Manuel Biagi Oro Verde, Argentina, SLA Images of Mons Rümker, Francisco Alsina Cardinalli Oro Verde, Argentina, SLA Images of Mädler (2), Mösting A (2), Boscovich (2), Julius Caesar (2), The- ophilus, Flamsteed P, Copernicus (3) and Mare Humboldtianum. Jairo Chavez Popayán, Colombia, SLA Image of Descartes, Flamsteed P, Leonardo Alberto Colombo Molinari, Argentina Images of the waxing gibbous Moon (2). Michel Deconinck Siguret lake - French Alps - Pastels of Rümker, Flamsteed and France Mare Humboldtianum. Walter Ricardo Elias AEA, Oro Verde, Argentina Image of Aristarchus (3), Lichtenberg, Mare Humboldtianum, Plato, Riccioli, Copernicus (2), Janssen, Messier and Proclus. Howard Eskildsen Ocala, Florida, USA Articles and images Caucasus to Mare Vaporum: Close Up Images of Aristil- lus, Autolycus and Putredinis Domes, Stöfler and Maurolycus and Region, Mare Vaporum to Sinus Medii and Some Associated Domes, Medii to Delaunay and a Concentric Crater and The Western Chain on an Eastern Moon Desiré Godoy Oro Verde, Argentina SLA Images of Mösting A (3), Julius Cae- sar, Hadley Rille, Victoria Gomez AEA, Oro Verde, Argentina Image of Mare Humboldtianum. Facundo Gramer AEA, Oro Verde, Argentina Image of Gassendi. Marina Grandolio Oro Verde, Argentina Image of Aristarchus, Atlas and Ty- cho. Many thanks for all these observations, images, and drawings. The Lunar Observer/May 2021/ 2 LunarObservations Topographic Received Studies Coordinator – David Teske - [email protected] Assistant Coordinator– Alberto Anunziato [email protected] Assistant CoordinatorMany thanks – William for all Dembowskithese observations, - dembowski@zone images, and drawings.-vx.com Assistant Coordinator – Jerry Hubbell – [email protected] Assistant Coordinator-Wayne Bailey– wayne.bailey@alpo -astronomy.org Website: http://www.alpo-astronomy.org/ Name Location and Organization Image/Article Marcelo Mojica Gundlach Cochabamba, Bolivia, SLA Images of Mösting A, Julius Caesar, Copernicus (3) Robert H. Hays, Jr. Worth, Illinois, USA Articles and drawings Mösting A and Hortensius Domes. Guy Heinen Linger, Luxembourg Images of Hortensius Domess. Rik Hill Loudon Observatory, Tucson, Arizona, Article and image The Greatest Crater?, A Scarp USA by Any Other Name, North-ish, Another Trio, images of Copernicus (8), Hortensius domes, Kepler, Apollo 15 landing site(2), Hadley Rille (2), Mare Humboldtianum, Endymion, Ariadaeus (2), Hyginus, Triesnecker (2), Mare Vaporum (2), Reinhold to Parry, Apollo 14 base (2), Fra Mauro, Eratosthenes, Copernicus to Eratosthe- nes, Stadius, Alphonsus, Rümker (4), Apollo 16 site (4) and Flamsteed. Felix León Santo Domingo, República Dominicana Images of Gassendi, Schickard, Schiller, Waxing Gibbous Moon, Vieta, Reiner Gamma, Aristar- chus, Eddington, Crüger, Bailly, Mons Rümker, Descartes, Copernicus, Daniel Marcus Plainfield, Vermont, USA Paintings of Schiaparelli and Jesús Piñeiro San Antonio de los Altos, Venezuela, Image of Copernicus SLA Pedro Romano San Juan, Argentina Images of Archimedes and Plato. John D. Sabia Keystone College Thomas G Cupillari Images and article Images of the Crater Schick- Observatory, Fleetville, Pennsylvania, ard USA Camilo Satler Oro Verde, Argentina, SLA Image of Descartes, Leandro Sid AEA, Oro Verde, Argentina Images of Waxing Gibbous Moon and Eratosthe- nes. David Teske Louisville, Mississippi, USA Article and images Mare Humboldtianum, the Other Multi-Ring Lunar Basin, image of Theoph- ilus and Mösting A. Román García Verdier Paraná, Argentina, SLA Images of Mösting A, Fabio Verza SNdR, UAI, Milan, Italy Images of Bailly, Moretus, Plato, Messier, Montes Alpes, Schickard, Tycho, Mare Hum- boldtianum, Cleomedes, Petavius Ignacio Villarraza San Nicolás de los Arroyos, Argentina, Image of Mare Humboldtianum. SLA The Lunar Observer/May 2021/ 3 May 2021 The Lunar Observer By the Numbers This month there were 146 observations by 28 contributors in 10 countries. Obbservers and Observations by Country May 2021 60 50 40 30 20 10 0 bservers Observations The Lunar Observer/May 2021/ 4 Stöfler and Maurolycus and Region Howard Eskildsen Battered craters Stöfler (left) and Maurolycus (right) appear to have battled for continued existence just above the center of this image. Stöfler nearly destroyed two craters on its SW margin and cast its ejecta into Fernelius to the north. Later, it was partly filled, possibly by fluidized ejecta from distant, basin-forming im- pacts, and its central peak is no longer visible. A rugged ridge angles across its eastern interior, perhaps rem- nants of a subsequent crater that that was in turn destroyed by Faraday, which centers on what had once been the SE rim of Stöfler. Two younger, small craters pocked its rim on the SW and NW margins, and help Stöfler stand out from the tortured background. Under some illuminations this crater grouping reminds me of a ladybug with Faraday as the head and Stöfler the body. Maurolycus lies to the right of Stöfler and has its own state of degradation. It does appear to be less battered than its companion, still has a visible central peak complex, and only about half of its floor appears partially filled. Its emplace- ment nearly obliterated an older crater whose remnants are visible on the lower left margin of Maurolycus. Remnants of another earlier crater lie outside its upper left rim. On its lower right, Barocius appears to be of similar age, and it is difficult to tell which formed first. Below Stöfler, the trio of Licetus, Cuvier, and Heraclitus form what I think of as the "Rat Fink" formation (with apologies to Ed "Big Daddy" Roth) for its resemblance to a long-snouted rat with two large, round ears. Heraclitus, with its strange central ridge, forms the snout and terminates with the younger Heraclitus D as its nose. At the op- posite end of the tortured Heraclitus, Licetus and Cuvier form the round ears of "Rat Fink." To the lower right of this trio, many more craters appear imbedded in a seemingly powdery terrain that appears about to spill over the craters' rims. This is the region of the Mutus-Vlacq basin; a hidden basin that was filled by craters and ejecta. Vlacq is vis- ible at the lower right corner of the image. Since this basin is so old and hidden, it was relatively recently discovered through its mass concentration as detected by the tan- dem GRAIL orbiters. (Gravity Recovery and Interior Laboratory) Maurolycus-Stöfler, Howard Eskildsen, Ocala, Florida, USA. 20 April 2021 00:45 UT, colongi- tude 4.5o. Celestron 9.25 inch Schmidt- Cassegrain telescope, Skyris 236 M camera. Seeing 7/10, transparency 4/6. The Lunar Observer/May 2021/ 5 North-ish Rik Hill The libration favored the south pole of the Moon this night but the landscape (selenoscape?) to the north was remarkable with broad tracts of mare material and many large flat floored craters. The pole here is over the limb and out of site but we have Aristoteles (90 km) in the lower right corner to the shadow filled Anaxago- ras (31 km) in the upper left. Just to the right of Anaxagoras is a much larger crater, Goldschmidt (124 km) with long shadows from the jagged peaks on the east side of the floor.
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  • Constraining the Source Regions of Lunar Meteorites Using Orbital Geochemical Data

    Constraining the Source Regions of Lunar Meteorites Using Orbital Geochemical Data

    Meteoritics & Planetary Science 50, Nr 2, 214–228 (2015) doi: 10.1111/maps.12412 Constraining the source regions of lunar meteorites using orbital geochemical data A. CALZADA-DIAZ1,2*, K. H. JOY3, I. A. CRAWFORD1,2, and T. A. NORDHEIM2,4 1Department of Earth and Planetary Sciences, Birkbeck College, London WC1E 7HX, UK 2Centre for Planetary Sciences UCL/Birkbeck, London WC1E 6BT, UK 3School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK 4Mullard Space Science Laboratory, University College London, Dorking RH5 6NT, UK *Corresponding author. E-mail: [email protected] (Received 30 July 2014; revision accepted 06 November 2014) Abstract–Lunar meteorites provide important new samples of the Moon remote from regions visited by the Apollo and Luna sample return missions. Petrologic and geochemical analysis of these meteorites, combined with orbital remote sensing measurements, have enabled additional discoveries about the composition and age of the lunar surface on a global scale. However, the interpretation of these samples is limited by the fact that we do not know the source region of any individual lunar meteorite. Here, we investigate the link between meteorite and source region on the Moon using the Lunar Prospector gamma ray spectrometer remote sensing data set for the elements Fe, Ti, and Th. The approach has been validated using Apollo and Luna bulk regolith samples, and we have applied it to 48 meteorites excluding paired stones. Our approach is able broadly to differentiate the best compositional matches as potential regions of origin for the various classes of lunar meteorites. Basaltic and intermediate Fe regolith breccia meteorites are found to have the best constrained potential launch sites, with some impact breccias and pristine mare basalts also having reasonably well-defined potential source regions.