Natasha V. Almeida

OSIRIS-REx Returned a Pristine Sample of Asteroid Bennu: Takeaways from the Mission's Contamination Control and Knowledge Program

Jason P. Dworkin, Scott A. Sandford, N. G. Lunning, Kevin Righter et autres

NASA's OSIRIS-REx mission had the objective of delivering a pristine sample from asteroid (101955) Bennu to Earth for scientific analysis--where "pristine" signifies the absence of foreign materials that could affect sample measurements. OSIRIS-REx returned 121.6 g of regolith in September 2023; this …

The Meteoritical Bulletin, No. 114

Jérôme Gattacceca, Jeffrey N. Grossman, Michael M. Weisberg, A. Greshake et autres

Meteoritical Bulletin 114 contains the 1944 meteorites approved by the Nomenclature Committee of the Meteoritical Society in 2025. It includes 15 observed falls, 1336 ordinary chondrites, 213 HED, 106 carbonaceous chondrites (including 8 ungrouped), 86 lunar meteorites, 39 ureilites, 28 iron meteorites …

The Meteoritical Bulletin, No. 114

Jérôme Gattacceca, J. N. Grossman, Michael K. WEISBERG, A. Greshake et autres

Abstract Meteoritical Bulletin 114 contains the 1944 meteorites approved by the Nomenclature Committee of the Meteoritical Society in 2025. It includes 15 observed falls, 1336 ordinary chondrites, 213 HED, 106 carbonaceous chondrites (including 8 ungrouped), 86 lunar meteorites, 39 ureilites, 28 iron …

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Mineralogical evidence for hydrothermal alteration of Bennu samples

Thomas J. Zega, T. J. McCoy, S. S. Russell, L. P. Keller et autres

Samples of asteroid (101955) Bennu delivered by the OSIRIS-REx mission offer the opportunity to study pristine planetary materials unchanged by exposure to the terrestrial environment. Here we use a combination of X-ray diffraction and various electron microscopy techniques to explore the detailed …

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Abundant microchondrules in 162173 Ryugu suggest a turbulent origin for primitive asteroids

Matthew J. GENGE, Natasha V. Almeida, Matthias Van Ginneken, Lewis Pinault et autres

Chondrules are a characteristic feature of primitive Solar System materials and are common in all primitive meteorites except the CI-chondrites. They are thought to form owing to melting of solid dust aggregates by energetic processing within the solar nebula and thus record …

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An overview of the petrography and petrology of particles from aggregate sample from asteroid Bennu

Harold C. Connolly Jr., Dante S. LAURETTA, T. J. McCoy, S. S. Russell et autres

Abstract The OSIRIS‐REx mission returned a sample of regolith from the carbonaceous asteroid Bennu in September 2023. We present preliminary in situ investigations of the petrology and petrography of selected particles ranging in size from 0.5 to 3 mm. Using a combination …

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The first Al-Cu-alloy-bearing unmelted micrometeorite suggests contributions from the disrupted ureilite protoplanet

Matthew J. GENGE, Matthias Van Ginneken, Chi Ma, Martin D. Suttle et autres

• Discovery of the first unmelted micrometeorite containing cu-al alloy. • The micrometeorite indicates collisional mixing of cu-al alloy with CV3 silicates. • Cu-Al-alloy bearing micrometeorites are derived from the same parent body as the CV3 khatyrka. • The ureilite parent body …

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An evaporite sequence from ancient brine recorded in Bennu samples

T. J. McCoy, S. S. Russell, Thomas J. Zega, K. L. Thomas-Keprta et autres

Abstract Evaporation or freezing of water-rich fluids with dilute concentrations of dissolved salts can produce brines, as observed in closed basins on Earth 1 and detected by remote sensing on icy bodies in the outer Solar System 2,3 . The mineralogical evolution …

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Rapid colonization of a space‐returned Ryugu sample by terrestrial microorganisms

Matthew J. GENGE, Natasha V. Almeida, Matthias Van Ginneken, Lewis Pinault et autres

Abstract The presence of microorganisms within meteorites has been used as evidence for extraterrestrial life, however, the potential for terrestrial contamination makes their interpretation highly controversial. Here, we report the discovery of rods and filaments of organic matter, which are interpreted as …

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Curation and classification procedures for the UK Antarctic meteorite collection

Jane L. MacArthur, Katherine Helen Joy, R. H. Jones, Thomas Harvey et autres

Abstract The field of advanced curation is important for existing astromaterials collections, which includes samples returned by space missions, and meteorites and cosmic dust samples that have been recovered from here on Earth. In order to maximize the scientific return of the …

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Evidence from 162173 Ryugu for the influence of freeze–thaw on the hydration of asteroids

Matthew J. GENGE, Natasha V. Almeida, Matthias Van Ginneken, Lewis Pinault et autres

Abstract Hydrated asteroids are likely to be main source of water for the terrestrial planets. The controls on the extent of asteroid hydration, however, are poorly understood. Here we report the discovery of multiple fracture and vein sets in a sample from …

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Brecciation at the grain scale within the lithologies of the Winchcombe Mighei‐like carbonaceous chondrite

Luke Daly, Martin D. Suttle, Martin Lee, John Bridges et autres

Abstract The Mighei‐like carbonaceous (CM) chondrites have been altered to various extents by water–rock reactions on their parent asteroid(s). This aqueous processing has destroyed much of the primary mineralogy of these meteorites, and the degree of alteration is highly heterogeneous at both …

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