Article
Astronomy & Astrophysics
Keisuke Sugiura, Makiko K. Haba, Hidenori Genda
Summary: This study investigates the effects of giant impacts on differentiated asteroids and suggests that an internal structure with a thick crust and a large core is more likely to produce mesosiderite meteorites.
Article
Astronomy & Astrophysics
Victoria E. Hamilton, Hannah H. Kaplan, Harold C. Connolly, Cyrena A. Goodrich, Neyda M. Abreu, Amy A. Simon
Summary: Orbital spectra of asteroid (101955) Bennu collected by NASA's OSIRIS-REx spacecraft suggest that CR1 meteorite GRO 95577 is a better analogue to Bennu's surface mineralogy. If this is true, the OSIRIS-REx sample could provide a unique opportunity to study carbonaceous chondrites.
Article
Astronomy & Astrophysics
J. Eschrig, L. Bonal, M. Mahlke, B. Carry, P. Beck, J. Gattacceca
Summary: By comparing the reflectance spectra of ordinary chondrites and S-type asteroids, it was found that there is no clear distinction between equilibrated and unequilibrated surfaces, making it challenging to differentiate them accurately.
Article
Astronomy & Astrophysics
Vishnu R. Reddy, Michael S. E. Kelley, Jessie Dotson, Rob R. A. Landis, Lauren E. A. McGraw, Marco A. Micheli, Nicholas A. Moskovitz, Juan A. M. Sanchez, Patrick A. J. Taylor, Lorien Wheeler, James M. P. Bauer, Melissa J. Brucker, Maxime C. Devogele, Joshua P. Emery, Olivier A. Hainaut, Dylan C. E. Hickson, Detlef Koschny, Jeffrey A. A. Larsen, Sean E. K. Marshall, Robert McMillan, Brian A. F. Skiff, Flaviane C. F. Venditti, Anne K. Virkki, Bin Yang, Luisa F. Zambrano-Marin
Summary: Hazards due to near-Earth objects (NEOs) continue to pose a threat to life on Earth. The physical characterization of a representative population of NEOs has lagged behind the progress in discovering them. To test the operational readiness of global planetary defense capabilities, a community-led global exercise was conducted, focusing on the characterization of a binary near-Earth asteroid and its moon. Spectral and radar observations were used to analyze the physical properties of the asteroid.
Article
Geochemistry & Geophysics
A. Stephant, M. Wadhwa, R. Hervig, M. Bose, X. Zhao, T. J. Barrett, M. Anand, I. A. Franchi
Summary: Recent studies on meteorites from asteroid 4 Vesta suggest an early presence of water in rocky bodies in the inner Solar System. By analyzing the hydrogen isotope composition of early-formed silicates, researchers aim to determine the source of water on these parent bodies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Peter Jenniskens, Mohutsiwa Gabadirwe, Qing-Zhu Yin, Alexander Proyer, Oliver Moses, Tomas Kohout, Fulvio Franchi, Roger L. Gibson, Richard Kowalski, Eric J. Christensen, Alex R. Gibbs, Aren Heinze, Larry Denneau, Davide Farnocchia, Paul W. Chodas, William Gray, Marco Micheli, Nick Moskovitz, Christopher A. Onken, Christian Wolf, Hadrien A. R. Devillepoix, Quanzhi Ye, Darrel K. Robertson, Peter Brown, Esko Lyytinen, Jarmo Moilanen, Jim Albers, Tim Cooper, Jelle Assink, Laslo Evers, Panu Lahtinen, Lesedi Seitshiro, Matthias Laubenstein, Nggie Wantlo, Phemo Moleje, Joseph Maritinkole, Heikki Suhonen, Michael E. Zolensky, Lewis Ashwal, Takahiro Hiroi, Derek W. Sears, Alexander Sehlke, Alessandro Maturilli, Matthew E. Sanborn, Magdalena H. Huyskens, Supratim Dey, Karen Ziegler, Henner Busemann, My E. I. Riebe, Matthias M. M. Meier, Kees C. Welten, Marc W. Caffee, Qin Zhou, Qiu-Li Li, Xian-Hua Li, Yu Liu, Guo-Qiang Tang, Hannah L. McLain, Jason P. Dworkin, Daniel P. Glavin, Philippe Schmitt-Kopplin, Hassan Sabbah, Christine Joblin, Mikael Granvik, Babutsi Mosarwa, Koketso Botepe
Summary: The impact of asteroid 2018 LA over Botswana on June 2, 2018, marked the second asteroid detected in space prior to impacting over land. The recovery of meteorites and additional astrometric data helped refine the orbit and characteristics of the asteroid. The findings suggest an origin from Vesta and provide insights into the impact chronology and age of Vesta's Veneneia impact basin.
METEORITICS & PLANETARY SCIENCE
(2021)
Article
Geochemistry & Geophysics
R. Parekh, K. A. Otto, K. D. Matz, R. Jaumann, K. Krohn, T. Roatsch, E. Kersten, S. Elgner, C. T. Russell, C. A. Raymond
Summary: Dust and melt ponds have been studied on planetary bodies like Eros, Itokawa, and the Moon, with different formation mechanisms depending on regolith material properties and planetary body locations. On Vesta, two types of ponds have been identified - ejecta ponds near impact craters, and dust ponds with undulating surfaces displaced from the crater center. Formation processes for type 2 ponds on Vesta may involve localized seismic diffusion and volatile-induced fluidization, hindering smooth morphology.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Geochemistry & Geophysics
H. C. Bates, K. L. Donaldson Hanna, A. J. King, N. E. Bowles, S. S. Russell
Summary: The study focuses on the relationship between volatile-rich asteroids and CI, CM, and CY chondrites, analyzing the emissivity spectra under different conditions to infer aqueous alteration and resolving the effects of aqueous and thermal alteration. The results provide insights into the mineralogy and metamorphism of these asteroids, contributing to a better understanding of the transport of water and organics in the early Solar System.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Engineering, Aerospace
Bo Ren, Yu Jiang, Hengnian Li, Chunsheng Jiang
Summary: This paper focuses on the existence and control of specific types of orbits around asteroid 4 Vesta. The study finds that the control periods of Vesta's Sun-synchronous orbits are longer compared to those of 21 Lutetia and 433 Eros. The critical inclination orbits of Vesta depend on the semi-major axis and eccentricity, while Sun-synchronous repeating ground-track circular orbits exist only for Vesta. Lastly, the perturbations of stationary orbits caused by solar gravitation and solar radiation pressure are analyzed.
Article
Geochemistry & Geophysics
J. A. Cartwright, K. V. Hodges, M. Wadhwa
Summary: Impact events on planetary surfaces can leave significant volumes of melt, which provide important information regarding the timing and nature of these events. This study investigates the impact history of two unpaired howardite meteorites and reveals a complex impact history for (4)Vesta, challenging the current models based on the Late Heavy Bombardment hypothesis.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Multidisciplinary Sciences
Ye Li, Bin Li, Weibiao Hsu, A. J. Timothy Jull, Shiyong Liao, Yuhui Zhao, Haibin Zhao, Yunhua Wu, Shaolin Li, Chipui Tang
Summary: Meteoroids and asteroids deposit energy to Earth and create strewn fields, which provide information about their trajectory and physical properties. The recently discovered Aletai irons in China have the longest known strewn field of about 430 kilometers, suggesting unique dynamics. Petrographic and elemental studies show that all Aletai masses have unique compositions, indicating a single fall event. Numerical modeling suggests that a stone skipping-like trajectory with a shallow entry angle explains Aletai's long strewn field.
Article
Geosciences, Multidisciplinary
Robert W. Nicklas, James M. D. Day, Kathryn G. Gardner-Vandy, Arya Udry
Summary: Using geochemical analyses, researchers have discovered a unique andesitic meteorite that has a different origin from other known andesitic meteorites, as well as Earth's continental crust. The study also suggests that this meteorite likely formed during the early history of the Solar System, with extensive andesitic magma differentiation occurring during this time, and the formation of andesitic crust not necessarily requiring plate tectonics.
Review
Astronomy & Astrophysics
A. Kereszturi, I Gyollai, Z. Juhasz, B. D. Pal, R. Racz, D. Rezes, B. Sulik
Summary: The effect of space weathering on airless asteroids can be studied through artificial irradiation tests on meteorites in labs. This study conducted infrared and Raman analysis based on simulated charged particle irradiation tests to better understand the potential observations of asteroid visiting missions. However, the analysis only focused on bulk meteorite spectra and neglected the analysis of minerals separately in their original context.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Ryuji Okazaki, Yayoi N. Miura, Yoshinori Takano, Hirotaka Sawada, Kanako Sakamoto, Toru Yada, Keita Yamada, Shinsuke Kawagucci, Yohei Matsui, Ko Hashizume, Akizumi Ishida, Michael W. Broadley, Bernard Marty, David Byrne, Evelyn Furi, Alex Meshik, Olga Pravdivtseva, Henner Busemann, My E. Riebe, Jamie Gilmour, Jisun Park, Ken-ichi Bajo, Kevin Righter, Saburo Sakai, Shun Sekimoto, Fumio Kitajima, Sarah A. Crowther, Naoyoshi Iwata, Naoki Shirai, Mitsuru Ebihara, Reika Yokochi, Kunihiko Nishiizumi, Keisuke Nagao, Jong Ik Lee, Patricia Clay, Akihiro Kano, Marc W. Caffee, Ryu Uemura, Makoto Inagaki, Daniela Krietsch, Colin Maden, Mizuki Yamamoto, Lydia Fawcett, Thomas Lawton, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Hikaru Yabuta, Hisayoshi Yurimoto, Yuichi Tsuda, Sei-Ichiro Watanabe, Masanao Abe, Masahiko Arakawa, Atsushi Fujii, Masahiko Hayakawa, Naoyuki Hirata, Naru Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu-Ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kosuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Tatsuhiro Michikami, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Ryudo Tsukizaki, Koji Wada, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako Iwamae, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Ryota Fukai, Tomohiro Usui, Trevor Ireland, Harold C. Connolly, Dante S. Lauretta, Shogo Tachibana
Summary: The Hayabusa2 spacecraft successfully returned to Earth from the asteroid Ryugu and brought back gas species stored in the sample container. Analysis of the gas composition revealed the presence of helium and neon with extraterrestrial characteristics.
Article
Astronomy & Astrophysics
Allison M. McGraw, Vishnu Reddy, Juan A. Sanchez
Summary: This study presents the results of a spectroscopic campaign on six members of the Gefion Asteroid Family (GAF) to test the hypothesis that L chondrites come from this family. The compositional analysis shows a range of meteorite analogues from L- to LL chondrites in these asteroids. It is suggested that the observed compositional heterogeneity in the GAF is likely due to the presence of interlopers, and further spectroscopic surveys are needed to isolate true family members.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
E. Quirico, L. V. Moroz, B. Schmitt, G. Arnold, M. Faure, P. Beck, L. Bonal, M. Ciarniello, F. Capaccioni, G. Filacchione, S. Erard, C. Leyrat, D. Bockelee-Morvan, A. Zinzi, E. Palomba, P. Drossart, F. Tosi, M. T. Capria, M. C. De Sanctis, A. Raponi, S. Fonti, F. Mancarella, V. Orofino, A. Barucci, M. I. Blecka, R. Carlson, D. Despan, A. Faure, S. Fornasier, M. S. Gudipati, A. Longobardo, K. Markus, V. Mennella, F. Merlin, G. Piccioni, B. Rousseau, F. Taylor
Article
Astronomy & Astrophysics
David T. Blewett, Brett W. Denevi, Lucille Le Corre, Vishnu Reddy, Stefan E. Schroeder, Carle M. Pieters, Federico Tosi, Francesca Zambon, Maria Cristina De Sanctis, Eleonora Ammannito, Thomas Roatsch, Carol A. Raymond, Christopher T. Russell
Article
Multidisciplinary Sciences
G. Filacchione, M. C. De Sanctis, F. Capaccioni, A. Raponi, F. Tosi, M. Ciarniello, P. Cerroni, G. Piccioni, M. T. Capria, E. Palomba, G. Bellucci, S. Erard, D. Bockelee-Morvan, C. Leyrat, G. Arnold, M. A. Barucci, M. Fulchignoni, B. Schmitt, E. Quirico, R. Jaumann, K. Stephan, A. Longobardo, V. Mennella, A. Migliorini, E. Ammannito, J. Benkhoff, J. P. Bibring, A. Blanco, M. I. Blecka, R. Carlson, U. Carsenty, L. Colangeli, M. Combes, M. Combi, J. Crovisier, P. Drossart, T. Encrenaz, C. Federico, U. Fink, S. Fonti, W. H. Ip, P. Irwin, E. Kuehrt, Y. Langevin, G. Magni, T. McCord, L. Moroz, S. Mottola, V. Orofino, U. Schade, F. Taylor, D. Tiphene, G. P. Tozzi, P. Beck, N. Biver, L. Bonal, J-Ph. Combe, D. Despan, E. Flamini, M. Formisano, S. Fornasier, A. Frigeri, D. Grassi, M. S. Gudipati, D. Kappel, F. Mancarella, K. Markus, F. Merlin, R. Orosei, G. Rinaldi, M. Cartacci, A. Cicchetti, S. Giuppi, Y. Hello, F. Henry, S. Jacquinod, J. M. Reess, R. Noschese, R. Politi, G. Peter
Article
Multidisciplinary Sciences
G. Filacchione, A. Raponi, F. Capaccioni, M. Ciarniello, F. Tosi, M. T. Capria, M. C. De Sanctis, A. Migliorini, G. Piccioni, P. Cerroni, M. A. Barucci, S. Fornasier, B. Schmitt, E. Quirico, S. Erard, D. Bockelee-Morvan, C. Leyrat, G. Arnold, V. Mennella, E. Ammannito, G. Bellucci, J. Benkhoff, J. P. Bibring, A. Blanco, M. I. Blecka, R. Carlson, U. Carsenty, L. Colangeli, M. Combes, M. Combi, J. Crovisier, P. Drossart, T. Encrenaz, C. Federico, U. Fink, S. Fonti, M. Fulchignoni, W. -H. Ip, P. Irwin, R. Jaumann, E. Kuehrt, Y. Langevin, G. Magni, T. McCord, L. Moroz, S. Mottola, E. Palomba, U. Schade, K. Stephan, F. Taylor, D. Tiphene, G. P. Tozzi, P. Beck, N. Biver, L. Bonal, J. -Ph. Combe, D. Despan, E. Flamini, M. Formisano, A. Frigeri, D. Grassi, M. S. Gudipati, D. Kappel, A. Longobardo, F. Mancarella, K. Markus, F. Merlin, R. Orosei, G. Rinaldi, M. Cartacci, A. Cicchetti, Y. Hello, F. Henry, S. Jacquinod, J. M. Reess, R. Noschese, R. Politi, G. Peter
Article
Astronomy & Astrophysics
Lucille Le Corre, Juan A. Sanchez, Vishnu Reddy, Driss Takir, Edward A. Cloutis, Audrey Thirouin, Kris J. Becker, Jian-Yang Li, Seiji Sugita, Eri Tatsumi
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Kathrin Markus, Lyuba Moroz, Gabriele Arnold, Daniela Henckel, Harald Hiesinger, Arno Rohrbach, Stephan Klemme
PLANETARY AND SPACE SCIENCE
(2018)
Article
Astronomy & Astrophysics
D. N. DellaGiustina, C. A. Bennett, K. Becker, D. R. Golish, L. Le Corre, D. A. Cook, K. L. Edmundson, M. Chojnacki, S. S. Sutton, M. P. Milazzo, B. Carcich, M. C. Nolan, N. Habib, K. N. Burke, T. Becker, P. H. Smith, K. J. Walsh, K. Getzandanner, D. R. Wibben, J. M. Leonard, M. M. Westermann, A. T. Polit, J. N. Kidd, C. W. Hergenrother, W. Boynton, J. Backer, S. Sides, J. Mapel, K. Berry, H. Roper, C. Drouet d'Aubigny, B. Rizk, M. K. Crombie, E. K. Kinney-Spano, J. de Leon, J. L. Rizos, J. Licandro, H. C. Campins, B. E. Clark, H. L. Enos, D. S. Lauretta
EARTH AND SPACE SCIENCE
(2018)
Article
Geochemistry & Geophysics
Iris Weber, Aleksandra N. Stojic, Andreas Morlok, Maximilian P. Reitze, Kathrin Markus, Harald Hiesinger, Sergey G. Pavlov, Richard Wirth, Anja Schreiber, Martin Sohn, Heinz-Wilhelm Huebers, Joern Helbert
EARTH AND PLANETARY SCIENCE LETTERS
(2020)
Article
Astronomy & Astrophysics
A. Nathues, N. Schmedemann, G. Thangjam, J. H. Pasckert, K. Mengel, J. Castillo-Rogez, E. A. Cloutis, H. Hiesinger, M. Hoffmann, L. Le Corre, J. -Y. Li, C. Pieters, C. A. Raymond, V. Reddy, O. Ruesch, D. A. Williams
Article
Astronomy & Astrophysics
Lucille Le Corre, Vishnu Reddy, William F. Bottke, Daniella N. DellaGiustina, Keara N. Burke, Jennifer Nolau, Robin B. Van Auken, Dathon R. Golish, Juan A. Sanchez, Jian-Yang Li, Christian Y. Drouet Y. d'Aubigny, Bashar Rizk, Dante S. Lauretta
Summary: The presence of exogenic boulders similar to eucrites and a possible mixture of eucrite with carbonaceous material on asteroid Bennu have been confirmed. Monte Carlo simulations suggest an estimate of the amount of ordinary chondrite (OC) material in Bennu's parent body, with the actual total amount being slightly higher than expected.
PLANETARY SCIENCE JOURNAL
(2021)
Article
Astronomy & Astrophysics
Allison M. McGraw, Vishnu Reddy, Matthew R. M. Izawa, Juan A. Sanchez, Lucille Le Corre, Edward A. Cloutis, Daniel M. Applin, Neil Pearson
ASTRONOMICAL JOURNAL
(2020)
Proceedings Paper
Engineering, Aerospace
Gabriele E. Arnold, D. Kappel, L. V. Moroz, K. Markus, Joern Helbert
INFRARED REMOTE SENSING AND INSTRUMENTATION XXVII
(2019)
Article
Astronomy & Astrophysics
Vishnu Reddy, Juan A. Sanchez, Roberto Furfaro, Richard P. Binzel, Thomas H. Burbine, Lucille Le Corre, Paul S. Hardersen, William F. Bottke, Marina Brozovic
ASTRONOMICAL JOURNAL
(2018)
Article
Astronomy & Astrophysics
A. Nathues, T. Platz, M. Hoffmann, G. Thangjam, E. A. Cloutis, D. M. Applin, L. Le Corre, V. Reddy, K. Mengel, S. Protopapa, D. Takir, F. Preusker, B. E. Schmidt, C. T. Russell
ASTRONOMICAL JOURNAL
(2017)
Article
Astronomy & Astrophysics
A. Nathues, T. Platz, G. Thangjam, M. Hoffmann, K. Mengel, E. A. Cloutis, L. Le Corre, V. Reddy, J. Kallisch, D. A. Crown
ASTRONOMICAL JOURNAL
(2017)
Article
Astronomy & Astrophysics
Maria Angeles Lopez-Cayuela, Maria-Paz Zorzano, Juan Luis Guerrero-Rascado, Carmen Cordoba-Jabonero
Summary: The atmospheric dust cycle on Mars plays a dominant role in the planetary radiative balance, atmospheric photochemistry escape, and redistribution of materials on the surface. A methodology is presented to accurately describe the annual dust redistribution cycle on Mars using orbital global and seasonal measurements of atmospheric dust opacity. The analysis shows that approximately 4 trillion kilograms of dust is transported globally in the atmosphere during a typical Mars year.
Article
Astronomy & Astrophysics
Audrey Vorburger, Shahab Fatemi, Shane R. Carberry Mogan, Andre Galli, Lucas Liuzzo, Andrew R. Poppe, Lorenz Roth, Peter Wurz
Summary: The study presents new model results for the composition of Ganymede's atmosphere, finding that sublimation remains the major source process for H2O, while radiolysis induced by auroral electrons dominates the source fluxes for O2 and H2.
Article
Astronomy & Astrophysics
Qi He, Zhi Cao, Yuqi Qian, Hejiu Hui, Ioannis Baziotis, Long Xiao, Zaicong Wang, Biji Luo, Yiheng Li, Zongjun Ying, Yang Li
Summary: The Chang'e-5 mission collected lunar soil containing magnesian troctolitic granulites, which provide valuable information on the composition of the lunar crust. Through analysis and modeling, it is suggested that these granulites may have originated from the Pythagoras crater and were transported to the landing site.
Article
Astronomy & Astrophysics
Jordan M. Bretzfelder, Kathryn M. Stack, Abigail A. Fraeman, Mackenzie Day, William E. Dietrich, Alexander B. Bryk
Summary: This study investigates the development of bedrock ridges on Mars and their implications for wind history, deposition, and erosion in Gale crater.
Article
Astronomy & Astrophysics
Lot Ram, Diptiranjan Rout, Rahul Rathi, Paul Withers, Sumanta Sarkhel
Summary: This study investigates the impacts of interplanetary coronal mass ejections (ICMEs) on the Martian ionosphere, specifically the behavior of the ionospheric peak density and height during ICME passages. The study used observations from the Radio Occultation Science Experiment (ROSE) aboard the MAVEN spacecraft and selected 8 ICMEs from existing catalogs. The results show that ICMEs lead to an elevation of the ionospheric peak height and a decrease in peak density, and propose that vertical pressure gradient and electron temperature enhancement are plausible causes for ionospheric variability.
Article
Astronomy & Astrophysics
Benoit Jabaud, Riccardo Artoni, Gabriel Tobie, Erwan Le Menn, Patrick Richard
Summary: The Cassini spacecraft discovered active jets of water vapour and ice grains at the South Pole of Enceladus, resulting in the deposit of freshly erupted materials on the moon's icy surface. Similar processes may be happening on Europa as well. Determining the mechanical properties of fresh icy powder-like materials is essential for future landing and sampling missions. The flowability and surface energy of ice powders decrease with increasing temperatures, which may have implications for stable landing and the flow of ice materials on Enceladus and Europa.
Article
Astronomy & Astrophysics
Lydie Bonal, Eric Quirico, Gilles Montagnac, Mutsumi Komatsu, Yoko Kebukawa, Hikaru Yabuta, Kana Amano, Jens Barosch, Laure Bejach, George D. Cody, Emmanuel Dartois, Alexandre Dazzi, Bradley De Gregorio, Ariane Deniset-Besseau, Jean Duprat, Cecile Engrand, Minako Hashiguchi, Kanami Kamide, David Kilcoyne, Zita Martins, Jeremie Mathurin, Smail Mostefaoui, Larry Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Shohei Yamashita, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Hisayoshi Yurimoto, Shogo Tachibana, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Kanako Sakamoto, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makota Yoshikawa
Summary: This paper focuses on characterizing the thermal history of asteroid Ryugu by studying the structure of polyaromatic carbonaceous matter in the returned samples. The study finds that there is no structural difference in the polyaromatic component between the two sampling sites on Ryugu, indicating that the thermal metamorphism related to radioactive decay was not significant. However, some structural variability is observed within the particle set.
Article
Astronomy & Astrophysics
M. Luginin, A. Fedorova, D. Belyaev, F. Montmessin, O. Korablev, J. -l. Bertaux
Summary: Spectroscopic solar occultation measurements by the SPICAV/SOIR instrument onboard the Venus Express orbiter provided new data on the upper haze aerosol properties, its distribution, and variations. A joint analysis of data from two spectrometers revealed a bimodal distribution in about 50% of observations previously believed to be unimodal, and characterized the size distribution 10 km higher in the atmosphere compared to previous analysis.
Article
Astronomy & Astrophysics
A. Mahieux, S. Viscardy, K. L. Jessup, F. P. Mills, L. Trompet, S. Robert, S. Aoki, A. Piccialli, A. C. Vandaele
Summary: We report on the mean upper limit number densities and volume concentrations of H2CO, O-3, NH3, HCN, N2O, NO2, NO, and HO2 at the Venus terminator above the cloud layer. Attempts to detect these species using a statistical algorithm and the method presented by Trompet et al. (2021) were unsuccessful, and upper limits of detection are provided.
Article
Astronomy & Astrophysics
P. M. Streeter, S. R. Lewis, M. R. Patel, J. A. Holmes, K. Rajendran
Summary: The northern polar vortex on Mars shows a high degree of interannual repeatability in its structure and evolution, except during large dust storms. The seasonal timing of these storms seems to be the key factor determining their impacts on the polar vortex.
Article
Astronomy & Astrophysics
Michael T. Mellon, Hanna G. Sizemore, Jennifer L. Heldmann, Christopher P. McKay, Carol R. Stoker
Summary: The search for life is a major focus of Mars exploration, with temperature and water activity being key factors for habitability. The most recent habitable conditions occurred about 510 kyrs ago and lasted for about 10s of kyrs each occurrence. All latitudes offer potential for life exploration, but middle-latitude sites have access to 100-kyr-old ice that experienced past habitable conditions, while high-latitude sites offer access to ancient ice over 1 Myrs old.
Article
Astronomy & Astrophysics
Anthony Ozerov, Jeffrey C. Smith, Jessie L. Dotson, Randolph S. Longenbaugh, Robert L. Morris
Summary: The Geostationary Lightning Mapper (GLM) instruments, with their large combined field of view, are useful for studying the population of atmospheric phenomena like bolides. However, there are biases when using GLM for non-lightning purposes, which need to be studied and accounted for before precise measurements of bolide flux can be obtained. A Bayesian Poisson regression model was developed to estimate instrumental biases and the latitudinal variation of bolide flux concurrently. The estimated bias corresponds to the known sensitivity of the GLM instruments, and the latitudinal flux variation estimates are consistent with a strong bias towards high-velocity bolides, as compared to existing theoretical models.
Article
Astronomy & Astrophysics
P. Beck, P. Y. Meslin, A. Fau, O. Forni, O. Gasnault, J. Lasue, A. Cousin, S. Schroeder, S. Maurice, W. Rapin, R. C. Wiens, A. M. Ollila, E. Dehouck, N. Mangold, B. Garcia, S. Schwartz, W. Goetz, N. Lanza
Summary: Analysis of data obtained by ChemCam on Mars reveals that the carbon signal is mainly related to ionization of the atmosphere, with variability potentially linked to the physical state of the atmosphere. Up to sol 3355, no carbonate was detected in the ChemCam dataset, suggesting that it is not a major constituent (>50%) in the analyzed targets and that carbon in soils is not enriched beyond the limit of detection. The dominant salts found in Gale are sulfate and chlorides, while the absence of carbonates, seen in Jezero, may be due to differences in protolith.
Article
Astronomy & Astrophysics
Eloy Pena-Asensio, Jaakko Visuri, Josep M. Trigo-Rodriguez, Hector Socas-Navarro, Maria Gritsevich, Markku Siljama, Albert Rimola
Summary: The observation of interstellar objects 1I/'Oumuamua and 2I/Borisov suggests the existence of a larger population of smaller projectiles that impact our planet with unbound orbits. A statistical evaluation of uncertainties in the CNEOS database and study of its hyperbolic fireballs reveals an anisotropic geocentric radiant distribution and low orbital inclinations, challenging the assumption of a randomly incoming interstellar population. These findings suggest that apparent interstellar meteors may, in fact, be the result of accelerated meteoroid impacts caused by close encounters with massive objects within or passing through our solar system.
Article
Astronomy & Astrophysics
Cecilia W. S. Leung, Leslie K. Tamppari, David M. Kass, German Martinez, Erik Fischer, Michael D. Smith
Summary: Using a combination of orbital and surface observations, this study investigates the vertical distribution of water vapor in the lower atmospheres of Mars. The findings suggest that the assumption of uniformly mixed water vapor in the boundary layer is not always consistent with observational constraints. The results provide important insights into the seasonal transport of water and the role of regolith-atmospheric exchange.