AUGUST 2021 Issue 4 The MERCURY NEWSLETTER by the Mercury Exploration Assessment Group (MExAG) TABLE OF CONTENTS MERCURY SCIENCE and EXPLORATION NEWS MERCURY SCIENCE and EXPLORATION NEWS ● MExAG Final Findings from our 2021 Annual Meeting are online: https://www.lpi.usra.edu/mexag/documents/ Following community discussions, the Steering RECENT MERCURY-RELATED Committee (SC) is working on drafting the first initial PUBLICATIONS MExAG Goals Document and expects to circulate a high-level summary to the community for input soon. UPCOMING MEETINGS with ● MExAG presented MExAG Technology Goals to the MERCURY-RELATED CONTENT Planetary Science and Astrobiology Decadal Survey on 4 June. The slides are online: https://www.lpi.usra.edu/mexag/documents/. STAY IN THE LOOP ● MExAG reported to the Planetary Advisory Committee https://www.lpi.usra.edu/mexag/ (PAC) on 14 June. The slides from the Advisory Group (AG) discussions are online: @ExploreMercury https://science.nasa.gov/researchers/nac/science-a MExAG list-serv: dvisory-committees/pac#meetingdocs. https://www.lpi.usra.edu/mexag/iofi/ ● NASA released its latest Discovery Data Analysis Community forum: Program (DDAP) call, which now includes research [email protected] based on the BepiColombo mission. Mandatory Notices of Intent are now due 28 September 2021 and KEEP US IN THE LOOP Proposals are due 23 November 2021. This call is part Please send Mercury community of the Dual-Anonymous Peer Review (DAPR) Program. announcements and calendar items for inclusion in our next quarterly newsletter ● The Panel on Mercury and the Moon has been to [email protected]. meeting regularly regarding the Planetary Science and Astrobiology Decadal Survey 2023-2032. Some of its meetings are open to the community. Learn more Spending August in the southern online: hemisphere? You may be able to spot https://www.nationalacademies.org/our-work/plane Mercury in the night sky with binoculars. tary-science-and-astrobiology-decadal-survey-202 Mars started the month appearing above Mercury, but will end the month below it, 3-2032-panel-on-mercury-and-the-moon#section after a planetary conjunction on 19 August. Committee. The MERCURY NEWSLETTER Page 1 AUGUST 2021 Issue 4 RECENT MERCURY-RELATED PUBLICATIONS 2021 Aizawa, S., Griton, L. S., Fatemi, S., Exner, W., Deca, J., Pantellini, F., Yagi, M., et al., (2021), Cross-comparison of global simulation models applied to Mercury’s dayside magnetosphere, Planetary and Space Science 198, 105176. https://doi.org/10.1016/j.pss.2021.105176. Bauch, K. E., Hiesinger, H., Greenhagen, B. T., Helbert, J., (2021), Estimation of surface temperatures on Mercury in preparation of the MERTIS experiment onboard BepiColombo, Icarus 354, 114083. https://doi.org/10.1016/j.icarus.2020.114083. Bertone, S., Mazarico, E., Barker, M. K., Goossens, S., Sabaka, T. J., Neumann, G. A., Smith, D. E., (2021), Deriving Mercury geodetic parameters with altimetric crossovers from the Mercury Laser Altimeter (MLA), Journal of Geophysical Research: Planets 126, e2020JE006683. https://doi.org/10.1029/2020JE006683. Berrada, M., Secco, R. A., Yong, W., (2021), Adiabatic heat flow in Mercury's core from electrical resistivity measurements of liquid Fe-8.5 wt%Si to 24 GPa, Earth and Planetary Science Letters 568, 117053. https://doi.org/10.1016/j.epsl.2021.117053. Deutsch, A. N., Head, J. W., Parman, S. W., Neumann, G. A., Lowden, F., (2021), Degassing of volcanic extrusives on Mercury: Potential contributions to transient atmospheres and buried polar deposits, Earth and Planetary Science Letters 564, 116907. https://doi.org/10.1016/j.epsl.2021.116907. Guerrero, J. M., Lowman, J. P., Tackley, P. J., (2021), Did the cessation of convection in Mercury's mantle allow for a dynamo supporting increase in heat loss from its core?, Earth and Planetary Science Letters 571, 117108. https://doi.org/10.1016/j.epsl.2021.117108. Hyodo, R., Genda, H., Brasser, R., (2021), Modification of the composition and density of Mercury from late accretion, Icarus 354, 114064. https://doi.org/10.1016/j.icarus.2020.114064. Jäggi, N., Galli, A., Wurz, P., Biber, H., Szabo, P. S., Brötzner, J., Aumayr, F., et al., (2021), Creation of lunar and hermean analogue mineral powder samples for solar wind irradiation experiments and mid-infrared spectra analysis, Icarus 365, 114492. https://doi.org/10.1016/j.icarus.2021.114492. Jasinski, J. M., Cassidy, T. A., Raines, J. M., Milillo, A., Regoli, L. H., Dewey, R., Slavin, et al., (2021). Photoionization loss of Mercury's sodium exosphere: Seasonal observations by MESSENGER and the THEMIS telescope, Geophysical Research Letters 48, e2021GL092980. https://doi.org/10.1029/2021GL092980. Katsura, T., Shimizu, H., Momoki, N., Toh H., (2021), Electromagnetic induction revealed by MESSENGER's vector magnetic data: The size of Mercury's core, Icarus 354, 114112. https://doi.org/10.1016/j.icarus.2020.114112. Knibbe, J. S., Rivoldini, A., Luginbuhl, S. M., Namur, O., Charlier, B., Mezouar, M., Sifre, D., et al., (2021), Mercury’s Interior Structure Constrained by Density and P-Wave Velocity Measurements of Liquid Fe-Si-C Alloys, Journal of Geophysical Research: Planets 126, e2020JE006651. https://doi.org/10.1029/2020JE006651. The MERCURY NEWSLETTER Page 2 AUGUST 2021 Issue 4 2021 cont. Kreslavsky, M. A., Zharkova, A. Yu., Head, J. W., Gritsevich, M. I., (2021), Boulders on Mercury, Icarus 369, 114628. https://doi.org/10.1016/j.icarus.2021.114628. McDonough, W. F., Yoshizaki, T., (2021), Terrestrial planet compositions controlled by accretion disk magnetic field, Progress in Earth and Planetary Science 8, 39. https://doi.org/10.1186/s40645-021-00429-4. Morlok, A., Renggli, C., Charlier, B., Reitze, M. P., Klemme, S., Namur, O., Sohn, M., et al., (2021), Mid-infrared reflectance spectroscopy of synthetic glass analogs for Mercury surface studies, Icarus 361, 114363. https://doi.org/10.1016/j.icarus.2021.114363. Pajola, M., Lucchetti, A., Semenzato, A., Poggiali, G., Munaretto, G., Galluzzi, V., Marzo, et al., (2021), Lermontov crater on Mercury: Geology, morphology and spectral properties of the coexisting hollows and pyroclastic deposits, Planetary and Space Science 195, 105136. https://doi.org/10.1016/j.pss.2020.105136. Pegg, D. L., Rothery, D. A., Conway, S. J., Balme, M. R., (2021), A fault surface exposed on Mercury, Planetary and Space Science 201, 105223. https://doi.org/10.1016/j.pss.2021.105223. Pegg, D. L., Rothery, D. A., Balme, M. R., Conway, S. J., (2021), Explosive vent sites on Mercury: Commonplace multiple eruptions and their implications, Icarus 365, 114510. https://doi.org/10.1016/j.icarus.2021.114510. Phillips, M. S., Moersch, J. E., Viviano, C. E., Emery, J. P., (2021), The lifecycle of hollows on Mercury: An evaluation of candidate volatile phases and a novel model of formation, Icarus 359, 114306. https://doi.org/10.1016/j.icarus.2021.114306. Plattner, A. M., Johnson, C. L. (2021), Mercury’s northern rise core-field magnetic anomaly. Geophysical Research Letters, in press, e2021GL094695. https://doi.org/10.1029/2021GL094695. Pokorný, P., Mazarico, E., Schorghofer N., (2021), Erosion of volatiles by micrometeoroid bombardment on Ceres and comparison to the Moon and Mercury, Planetary Science Journal 2, 85. https://doi.org/10.3847/PSJ/abef04. Reitze, M. P., Weber, I., Morlok, A., Hiesinger, H., Bauch, K. E., Stojic, A. N., Helbert, J., (2021), Mid-Infrared Spectroscopy of Anorthosite Samples from near Manicouagan Crater, Canada, as Analogue for Remote Sensing of Mercury and Other Terrestrial Solar System Objects, Journal of Geophysical Research: Planets 126, e2021JE006832. https://doi.org/10.1029/2021JE006832. Reitze, M. P., Weber, I., Morlok, A., Hiesinger, H., Bauch, K. E., Stojic, A. N., Helbert, J., (2021), Mid-infrared spectroscopy of crystalline plagioclase feldspar samples with various Al,Si order and implications for remote sensing of Mercury and other terrestrial Solar System objects, Earth and Planetary Science Letters 554, 116697. https://doi.org/10.1016/j.epsl.2020.116697. Schmid, D., Narita, Y., Plaschke, F., Volwerk, M., Nakamura, R., Baumjohann, W., (2021), Pick-up ion cyclotron waves around Mercury, Geophysical Research Letters 48, e2021GL092606. https://doi.org/10.1029/2021GL092606. Stojic, A. N., Morlok, A., Tollan, P., Kohout, T., Hermann, J., Weber, I., Moreau, J.-G., et al., (2021), A shock recovery experiment and its implications for Mercury's surface: The effect of high pressure on porous olivine powder as a regolith analog, Icarus 357, 114162. https://doi.org/10.1016/j.icarus.2020.114162. The MERCURY NEWSLETTER Page 3 AUGUST 2021 Issue 4 2021 cont. Sun, L.-Z., Huang, C.-L., Yu, Y., Qi, Z.-X., Tang, Z.-H., Zhao, M., Yang, D.-H., et al., (2021), A new telescope with three fields of view to measure the orientation parameters of the Moon and terrestrial planets, Research in Astronomy and Astrophysics 21, 040. https://doi.org/10.1088/1674-4527/21/2/40. Susorney, H. C. M, Ernst, C. M., Chabot, N. L., Deutsch, A. N., Barnouin, O. S., (2021), Morphometry and Temperature of Simple Craters in Mercury’s Northern Hemisphere: Implications for Stability of Water Ice, Planetary Science Journal 2, 97. https://doi.org/10.3847/PSJ/abf4ca. Tao, R., Fei, Y. (2021), High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary, Earth and Planetary Science Letters 562, 116849. https://doi.org/10.1016/j.epsl.2021.116849. Watters, T. R., (2021), A case for limited global contraction of Mercury, Communications Earth and Environment 2, 9. https://doi.org/10.1038/s43247-020-00076-5. Xiao, Z., Xu, Rui, Wang, Y., Chang, Y., Xu, Ru, Cui, J., (2021), Recent dark pyroclastic deposits on Mercury, Geophysical Research Letters 48, e2021GL092532. https://doi.org/10.1029/2021GL092532. 2020 Amendments (Full list: https://www.lpi.usra.edu/mexag/publications/) Barraud, O., Doressoundiram, A., Besse, S., Sunshine, J. M., (2020), Near-ultraviolet to near-infrared spectral properties of hollows on Mercury: Implications for origin and formation process, Journal of Geophysical Research: Planets 125, e2020JE006497.