Chondrites are undifferentiated meteorites that can provide information on the compositions of materials in early solar System, including building blocks terrestrial planets. While most chondrites belong to well-defined groups based their mineralogy and chemical composition, a minor fraction have unusual characteristics classified as ungrouped chondrites. These reflect diversity chondritic syst...

Meteoritical Bulletin 110 contains the 2802 meteorites approved by Nomenclature Committee of Society in 2021. It includes 10 falls (Arpu Kuilpu, Djadjarm, Glendale, Kindberg, Madura Cave, Motopi Pan, Orconuma, Punggur, Tihigrin, Winchcombe), with 2014 ordinary chondrites (including 1 ungrouped chondrite), 220 carbonaceous 11 ungrouped), 212 HED achondrites, 69 lunar meteorites, 62 ureilites, 43...

Abstract Remote spectral characterization of near-Earth asteroids (NEAs) relies on laboratory calibration to constrain their surface composition, including mineral chemistry and relative abundances. Often these calibrations are based fine meteorite powders that representative regolith observed large NEAs such as (433) Eros. However, spacecraft observations smaller (25143) Itokawa, (101955) Benn...

Understanding the evolution of metal in protoplanetary disk is necessary to constrain first steps metal-silicate segregation and early stages disk. We measured siderophile elemental compositions (PGE, Ni, Co, Fe, Cu, Ga, Ge) individual grains H ordinary chondrites by laser ablation inductively coupled plasma mass spectrometry investigate their formation. analyzed unequilibrated (H3) processes a...

Introduction: Chondrites, the most primitive rocks in the solar system are assemblages of high temperature components CAIs and chondrules embedded in a volatile-rich, fine-grained matrix. Different chondrite groups have long been known to have distinct populations of petrological components [1] as well as specific oxygen isotopic signatures [2-4]. Varying bulk oxygen isotopic composition might ...

The paper discusses the geochemistry of major (EPMA) and trace (SIMS) elements in olivine porphyritic, nonporphyritic chondrules, matrix equilibrated ordinary chondrite Saratov (L4). Olivine corresponds to forsterite is rather heterogeneous (Fo 73-77). No differences content chondrule meteorite were found. However, within chondrules varies considerably; high values found from barred chondrules....

We conducted photometric and spectroscopic characterization of near-Earth asteroid (52768) 1998 OR2 during a close approach to the Earth in April 2020. Our measurements confirm rotation period be 4.126 +/- 0.179 hours, consistent with previously published value 4.112 0.001 hours. By combining our visible (0.45 - 0.93 microns) archival MITHNEOS near infrared spectra (0.78 2.49 microns), we class...

A reanalysis of NEAR X-ray/gamma-ray spectrometer (XGRS) data provides robust evidence that the elemental composition of the near-Earth asteroid 433 Eros is consistent with the L and LL ordinary chondrites. These results facilitated the use of the gamma-ray measurements to produce the first in situ measurement of hydrogen concentrations on an asteroid. The measured value, 1100-700+1600 ppm, is ...

The catastrophic disruption of the L chondrite parent body in the asteroid belt c. 470 Ma initiated a prolonged meteorite bombardment of Earth that started in the Ordovician and continues today. Abundant L chondrite meteorites in Middle Ordovician strata have been interpreted to be the consequence of the asteroid breakup event. Here we report a zircon U-Pb date of 467.50±0.28 Ma from a distinct...