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Asteroid 3628 Božněmcová: Covered with angrite‐like basalts?
Author(s) -
Cloutis Edward A.,
Binzel Richard P.,
Burbine Thomas H.,
Gaffey Michael J.,
McCoy Timothy J.
Publication year - 2006
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.2006.tb00512.x
Subject(s) - plagioclase , olivine , chondrite , basalt , geology , feldspar , meteorite , parent body , geochemistry , asteroid , pyroxene , mineral , mineralogy , astrobiology , chemistry , physics , quartz , paleontology , organic chemistry
— A detailed analysis of the reflectance spectrum of asteroid 3628 Božněmcová, previously identified as a possible ordinary chondrite parent body, indicates that its surface consists of an assemblage dominated by clinopyroxene and plagioclase feldspar. The clinopyroxene is Fe 2+ ‐bearing (likely in the range Fs ˜10–20 ), with >90% of the Fe 2+ being present in the M1 crystallographic site (spectral type A). The clinopyroxene:plagioclase feldspar ratio is between ˜2 and 3 (˜55–75% clinopyroxene, ˜20–33% plagioclase feldspar). If olivine is present, the clinopyroxene:olivine ratio is >˜3 (<20% olivine). The derived mineralogy of Božněmcová is most similar, but not identical, to the known angrite meteorites. The data suggest that Božněmcová formed by melting and differentiation of an oxidized chondritic precursor and probably represents an unsampled angrite‐like body.