An Fe-Ni melt residue deposited in space - A new class of micrometeoroid?

Details An Fe-Ni melt residue deposited in space - A new class of micrometeoroid? An Fe-Ni melt residue deposited in space - A new class of micrometeoroid?

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..445g&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 445.

Computer Science

1

Micrometeoroids, Meteoritic Composition, Hubble Space Telescope, X Ray Spectra, Iron Meteorites, Nickel, Emission Spectra, Globules, Melting, Kamacite, Interplanetary Dust

Scientific paper

This paper reports on an impact residue from a Hubble Space Telescope solar cell which has a distinctly non-chondritic composition, but appears not to be terrestrial in origin. Digital backscattered electron images and X-ray emission maps of the crater were produced, and the identified residue was subsequently analyzed. A high-magnification and high-pixel resolution X-ray emission map of the area established that the bright spherical globules which attached and embedded within the melt surface of the cell host were almost solely composed of Fe-Ni metal. The surrounding area was composed of host melt (Si, K, Ca, Ba, Zn, with minor Mg and Ce). The composition of the globules was 93.4 +/- 1.8 wt. pct Fe and 6.4 +/- 1.8 wt. pct Ni, with trace Mn. The composition is well within the range of kamacite, a metal precursor recorded from iron meteorites, and suggests that the impactor could be a primary iron-nickel micrometeoroid. This first identification of such an entity raises the question as to why such samples are not recognized in the stratospheric interplanetary dust particle collections.

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