Aubrite
 | This articleneeds additional citations forverification.(March 2009) |
| Aubrite | |
|---|---|
| —Group— | |
 Cumberland Falls, an aubrite | |
| Type | Achondrite |
| Class | Asteroidal achondriteorenstatiteachondrite |
| Parent body | Possibly(3103) Eger |
 Shallowater meteorite, an aubrite | |
Aubritesare a group ofmeteoritesnamed for Aubres,[1]a small achondrite meteorite that fell in 1836 inAubresnearNyons,France.They are primarily composed of theorthopyroxeneenstatiteand are often called enstatiteachondrites.Theirigneousorigin separates them from primitive enstatite achondrites and means they originated in anasteroid.
Aubrites are typically light-colored with a brownish fusion crust. Most aubrites are heavily brecciated; they are often said to look "lunar" in origin.
Aubrites are primarily composed of large white crystals of the Fe-poor, Mg-rich orthopyroxene, or enstatite, with minor phases of olivine, nickel-iron metal, and troilite, indicating a magmatic formation under extremely reducing conditions. The severebrecciationof most aubrites attests to a violent history for their parent body. Since some aubrites contain chondritic xenoliths, it is likely that the aubrite parent body collided with an asteroid of "F-chondritic" composition.
Comparisons of aubrite spectra to the spectra of asteroids have revealed striking similarities between the aubrite group and theE-type asteroidsof theNysa family.A smallnear-Earth object,3103 Eger,is also often suggested as the parent body of the aubrites.[2]
It has been suggested that aubrites may originate from the planetMercury.[1][3]
The aubrite2024 BX1might on the other hand originate from theHungaria family.[4][5]Its spectrum shows similarities to(434) Hungaria.The composition is however different when compared to(44) Nysaand(64) Angelina,ruling out a linkage.[4]Its orbit orientation does not agree with 3103 Eger, which rules out Eger as a direct origin. The spectrum is also not meaningful similar when compared to Mercury.[5]
See also
[edit]References
[edit]- ^abO'Callaghan, Jonathan (10 February 2024)."Fragments of Asteroid With Mystery Origin Are Found Outside Berlin - Astronomers tracked the entry of a small space rock into Earth's atmosphere, and then meteorite hunters made an unexpected discovery".The New York Times.Archivedfrom the original on 10 February 2024.Retrieved10 February2024.
- ^Gaffey, Michael J.; Reed, Kevin L.; Kelley, Michael S. (November 1992)."Relationship of E-type Apollo asteroid 3103 (1982 BB) to the enstatite achondrite meteorites and the Hungaria asteroids".Icarus.100(1): 95–109.Bibcode:1992Icar..100...95G.doi:10.1016/0019-1035(92)90021-X.Retrieved14 May2021.
- ^O'Callaghan, Jonathan (23 May 2022)."Shards of the Planet Mercury May Be Hiding on Earth".The New York Times.Retrieved14 February2023.
- ^abCantillo, David C.; Ridenhour, Kaycee I.; Battle, Adam; Joyce, Thomas; Nunez Breceda, Juliana; Pearson, Neil; Reddy, Vishnu (2024-06-01)."Laboratory Spectral Characterization of Ribbeck Aubrite: Meteorite Sample of Earth-impacting Near-Earth Asteroid 2024 BX1".The Planetary Science Journal.5(6): 138.Bibcode:2024PSJ.....5..138C.doi:10.3847/PSJ/ad4885.ISSN2632-3338.
- ^abBischoff, Addi; Patzek, Markus; Barrat, Jean-Alix; Berndt, Jasper; Busemann, Henner; Degering, Detlev; Di Rocco, Tommaso; Ek, Mattias; Harries, Dennis; Godinho, Jose R. A.; Heinlein, Dieter; Kriele, Armin; Krietsch, Daniela; Maden, Colin; Marchhart, Oscar (2024-07-31)."Cosmic pears from the Havelland (Germany): Ribbeck, the twelfth recorded aubrite fall in history".Meteoritics & Planetary Science.doi:10.1111/maps.14245.ISSN1086-9379.
External links
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