Diversity of Hydrated Minerals on C-Class Asteroids

Details Diversity of Hydrated Minerals on C-Class Asteroids Diversity of Hydrated Minerals on C-Class Asteroids

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3303r&link_type=abstract

American Astronomical Society, DPS meeting #39, #33.03; Bulletin of the American Astronomical Society, Vol. 39, p.476

Astronomy and Astrophysics

Astronomy

Scientific paper

Water- and hydroxyl-bearing minerals (hereafter simply called "hydrated minerals") are found in most classes of carbonaceous chondrite meteorites. They are also found in a majority of C-class and related asteroids, which dominate the asteroid belt as a whole [1]. Remote detection of hydrated minerals on asteroids is typically done in the 3-μm spectral region, though some work has also been done at 0.7 μm [2]. While not as commonly utilized as the 0.4-2.5 μm region, quantitative compositional studies in the 3-μm region have identified the presence of carbonates on 1 Ceres [3] and shown that the hydrated minerals present on asteroid surfaces can vary from object to object [4].
Over the last several years, more than 100 asteroids have been observed in the 3-μm region using Spex at the IRTF. Further examples of diversity in hydrated mineralogies are found in the larger sample, and an increased understanding of the distribution of different spectral types is enabled as well. For instance, "Ceres-type” objects are found in relatively restricted areas, while "Pallas-type” objects are found spread throughout the asteroid belt. There are also hints that a third, "Cybele-type” spectrum may be common. Examples of the new data and their interpretations will be presented, including a possible, preliminary detection of water ice on an asteroidal surface.
References: [1] Burbine et al. in Asteroids III (2002). [2] Rivkin et al. in Asteroids III (2002). [3] Rivkin et al. Icarus 185, (2006). [4] Rivkin et al. Met. Plan. Sci. 38 (2003).
This work has been supported by grant NNG05GR60G from the NASA Planetary Astronomy Program.

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