Results 21 to 30 of about 274 (116)

Effects of Comet Encke's Meteoroid Stream on the Seasonal Variation of Mercury's Ca Exosphere

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract Mercury's calcium (Ca) exosphere, observed by NASA's MESSENGER mission, exhibits high temperatures (>50000 K) and pronounced seasonal variability, with its source mainly on the dawn side. Enhanced Ca emission near True Anomaly Angle (TAA) ∼25° and ∼150° has been attributed to Comet 2P/Encke meteoroid streams.
M. Moroni, A. Milillo, A. Mura, A. A. Christou, P. Pokorný, V. Mangano, A. Berezhnoy, A. Aronica, A. Brin, E. De Angelis, P. P. Di Bartolomeo, A. Kazakov, S. Massetti, S. Orsini, C. Plainaki, G. Richards, R. Rispoli, R. Sordini, M. Stumpo   +18 more
wiley   +1 more source

Potential of VIS‐IR imaging spectroscopy and SEM‐EDS and EMPA to map the mineralogical composition of NWA 7317 (CR6)

Meteoritics &Planetary Science, Volume 61, Issue 6, Page 1026-1044, June 2026.
Abstract Asteroid compositional analysis relies on comparing reflectance spectra with laboratory data from well‐characterized meteorites. To advance this comparison, we performed a comprehensive laboratory analysis on a slab of the Northwest Africa (NWA) 7317—CR6 carbonaceous chondrite.
Simone Pascucci, Tiberio Cuppone, Martina Casalini, Simone De Angelis, Antonio Lettino, Angelo Palombo, Eliana La Francesca, Gianrico Filacchione, Maria Cristina De Sanctis, Anna Galiano, Giovanni Pratesi   +10 more
wiley   +1 more source

Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009

, 2010
Every three years the IAU Working Group on Cartographic Coordinates and Rotational Elements revises tables giving the directions of the poles of rotation and the prime meridians of the planets, satellites, minor planets, and comets.
Courtin, R., Fukushima, Toshio, R. Courtin, Archinal, B.A., Krasinsky, George, A'Hearn, M.F., B. A. Archinal, G. J. Consolmagno, Krasinsky, G.A., G. Neumann, Courtin, Régis, Hestroffer, D., Hilton, J.L., I. P. Williams, Stooke, P., J. L. Hilton, E. Bowell, J. Oberst, Bowell, E., G. A. Krasinsky, Oberst, Jürgen, Williams, I.P., D. Hestroffer, A'Hearn, M. F., Seidelmann, P. Kenneth, T. Fukushima, Hilton, James L., Fukushima, T., D. J. Tholen, Hestroffer, Daniel, Thomas, Patrick, P. C. Thomas, A. Conrad, P. Stooke, M. F. A’Hearn, Consolmagno, Guy J., Tholen, David J., Thomas, P.C., Consolmagno, G.J., Neumann, G., Tohlen, D.J., Seidelmann, P.K., Oberst, J., Archinal, B. A., P. K. Seidelmann, Conrad, Al, Williams, Iwan P., Conrad, A.   +47 more
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Radiative Forcing and Ozone Depletion of a Decade of Satellite Megaconstellation Missions

Earth's Future, Volume 14, Issue 5, May 2026.
Abstract Satellite megaconstellations (SMCs) are driving rapid increases in rocket launch and re‐entry rates, emitting pollutants throughout the atmosphere. The environmental impact of SMCs lacks characterization to determine the need for regulation. We utilize a global 3D emission inventory of recent (2020–2022) space activity that distinguishes SMC ...
Connor R. Barker, Eloise A. Marais, Eric Y. P. Tan, Sebastian D. Eastham, Glenn S. Diskin, Joshua P. DiGangi, Yonghoon Choi, Andrew W. Rollins, Eleanor Waxman, T. Paul Bui, Charles K. Gatebe, Jonathan Dean‐Day, Rajesh Poudyal   +12 more
wiley   +1 more source

Monitoring of asteroids in cometary orbits and activated asteroids through archival images and new observations

International audienceContext. Transitional objects are minor bodies that share some characteristics with asteroids and others with comets. These objects include asteroids in cometary orbits (ACOs), which behave dynamically like comets, but lack observed
R. Miquel, de Vicente, J, J. Mena-Fernández, I. Sevilla-Noarbe, H. Medeiros, E. Rondón, E. Gaztanaga, Camargo, J.I.B, Frieman, J, K. Kuehn, García-Bellido, J, Miquel, R, Rondón, E, Medeiros, H, J. García-Bellido, O. Lahav, Banda-Huarca, M, J. I. B. Camargo, Mesquita, F.W, G. Tancredi, Gaztanaga, E, Hinton, S.R, Andrade-Oliveira, F, M. Evangelista-Santana, Tarle, G, Weaverdyck, N, Gruen, D, James, D.J, G. Tarle, Martino, S, Kuehn, K, D. Sanchez Cid, E. Sanchez, Arcoverde, P, Michimani, J, M. Aguena, A. Carnero Rosell, D. Brooks, S. Everett, Mena-Fernández, J, Suchyta, E, Rosell, A. Carnero, Sanchez, E, Licandro, J, Carretero, J, A. A. Plazas Malagón, Evangelista-Santana, M, J. L. Marshall, J. Licandro, J. Michimani, R. A. Gruendl, Pereira, J.W, A. Pieres, P. Doel, M. Banda-Huarca, Monteiro, F, L. N. da Costa, S. R. Hinton, H. T. Diehl, P. H. Bernardinelli, S. Martino, D. J. James, da Costa, L.N, S. Samuroff, Marshall, J.L, P. Arcoverde, Brooks, D, Doel, P, D. Gruen, Davis, T.M, Smith, M, T. M. Davis, Hollowood, D.L, D. L. Hollowood, E. Suchyta, Malagón, A.A. Plazas, Lahav, O, J. W. Pereira, F. Andrade-Oliveira, N. Weaverdyck, Diehl, H.T, Samuroff, S, Bernardinelli, P.H, Tancredi, G, Gruendl, R.A, F. W. Mesquita, Aguena, M, J. Carretero, J. Frieman, Sevilla-Noarbe, I, J. De Vicente, Pieres, A, Cid, D. Sanchez, M. Smith, Everett, S, F. Monteiro   +95 more
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Saponite Bearing Material Excavated During the Formation of a Recent 25‐m‐Diameter Impact Crater in Southeastern Arabia Terra on Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract Mars Reconnaissance Orbiter's Compact Reconnaissance Imaging Spectrometer for Mars (CRISM), Context Imager (CTX), and High Resolution Imaging Science Experiment observations were analyzed for a 25‐m‐wide impact crater and associated ejecta deposits located in the dust‐covered Arabia Terra region.
R. E. Arvidson, J. G. Catalano, J. R. Christian, A. A. Fraeman, M. N. Hughes, A. L. Knight, W. B. McKinnon, R. V. Morris, S. L. Murchie, J. A. O’Sullivan, D. V. Politte, F. Seelos, M. J. Wolff, F. Zhou   +13 more
wiley   +1 more source

Archives of impact: The politics of craters on Earth

Geographical Research, Volume 64, Issue 2, May 2026.
This paper examines Earth’s 195 confirmed impact craters as archives, exploring their cataloguing and presentation as heritage sites. It argues Western scientific framings using military language and emphasising catastrophe overlook settler colonialism’s violent histories and marginalise indigenous earth‐sky cosmologies.
Gareth Hoskins
wiley   +1 more source

Assessment of early-modern observations of comets and supernovae: Focus on pre-telescopic European astrometric and physical data [PDF]

, 2004
The two-century period prior to the publication of Newton's Principia (first edition 1687; third edition 1726) was most important in terms of the radical changes that occurred in the observation, perception, and understanding of celestial objects that in
Green, Daniel W. E., Green, Daniel W E
core  

CI chondrite Oued Chebeika 002 links asteroids Bennu and Ryugu to common parent body

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 801-818, May 2026.
Abstract CI chondrites are a compositionally primitive group of meteorites that have undergone extensive aqueous alteration, providing insights into the evolution of primitive planetesimals. Oued Chebeika 002 is the most pristine CI chondrite to date.
Megan Broussard, Katharina Lodders, Paul K. Carpenter, Piers Koefoed, Karen Ziegler, Kunihiko Nishiizumi, Marc W. Caffee, Laurence A. J. Garvie, Ryan C. Ogliore, Anthony J. Irving, Bradley L. Jolliff, Kun Wang   +11 more
wiley   +1 more source

Ryugu reference project: Recommendations from the measurement definition team

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 819-848, May 2026.
Abstract Sample return missions play a significant role in planetary science by providing pristine extraterrestrial materials. JAXA's Hayabusa2 and NASA's OSIRIS‐REx missions have returned samples from the C‐type asteroids Ryugu and Bennu, respectively. The chemical and mineralogical compositions of these samples closely resemble those of CI chondrites,
Tetsuya Yokoyama, Guillaume Avice, Henner Busemann, Nicolas Dauphas, Daniel P. Glavin, Ashley J. King, Thorsten Kleine, Katharina Lodders, Frederic Moynier, Maria Schönbächler, Yoshinori Takano, Kun Wang, Hikaru Yabuta, Yuma Enokido, Ryota Fukai, Shogo Tachibana, Tomohiro Usui   +16 more
wiley   +1 more source