Genetic studies of the members of small, dynamical asteroid families

Details Genetic studies of the members of small, dynamical asteroid families Genetic studies of the members of small, dynamical asteroid families

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt.........4k&link_type=abstract

Thesis (PhD). RENSSELAER POLYTECHNIC INSTITUTE, Source DAI-B 60/04, p. 1488, Oct 1999, 72 pages.

Mathematics

Logic

Metis, Amalthea, Hungaria, Silicate

Scientific paper

Analyses of spectrophotometric data of asteroids 9 Metis and 113 Amalthea have revealed a probable genetic (compositional) link between these two objects. The nearly identical composition of the silicate components of these two asteroids is consistent with their derivation from a single parent body. Based on the present compositional and morphological interpretations of 9 Metis and 113 Amalthea, and using plausible (chondritic) starting compositions for the parent body, the original parent asteroid is estimated to have been between approximately 300 and 600 kilometers in diameter. Thus Metis and Amalthea are the largest survivors of a highly-evolved, genetic asteroid family from which 86-96% of the original mass has been lost. New data in the wavelength region of approximately 0.4-2.5 μm have been obtained for asteroid 434 Hungaria. This is the most complete visible to near- infrared spectrum to date for this object. The near- infrared portion of the spectrum is smooth, featureless, and agrees well with previous visible region data. Hungaria's relatively high albedo of 46 percent and lack of intense spectral absorption features strictly limits the suite of possible mineral analogs for this asteroid. Based on spectral, meteoritic and petrologic considerations the silicate composition of the surface of Hungaria is mostly likely made up of iron-free enstatite. However, new visible region data appear to exhibit weak, broad spectral absorption features near 0.5, 0.6, and 1 μm. While the features near 0.5 and 1 μm are unreliable and inconsistent, the weak feature near 0.6 μm appears to be real and may help to constrain the composition of Hungaria. Most minerals which exhibit a similar absorption feature, and are commonly found in meteorites, have a much lower albedo. The dark chondritic inclusions in the Cumberland Falls aubrite exhibit a similar feature near 0.6 μm, and this meteorite provides a possible spectral and compositional analog for Hungaria.

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