Astrometric masses of 26 asteroids and observations on asteroid porosity

Baer, James, Chesley, Steven R., and Matson, Robert D. (2011) Astrometric masses of 26 asteroids and observations on asteroid porosity. Astronomical Journal, 141 (5). 143. pp. 1-12.

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As an application of our recent observational error model, we present the astrometric masses of 26 main-belt asteroids. We also present an integrated ephemeris of 300 large asteroids, which was used in the mass determination algorithm to model significant perturbations from the rest of the main belt. After combining our mass estimates with those of other authors, we study the bulk porosities of over 50 main-belt asteroids and observe that asteroids as large as 300 km in diameter may be loose aggregates. This finding may place specific constraints on models of main-belt collisional evolution. Additionally, we observe that C-group asteroids tend to have significantly higher macroporosity than S-group asteroids.

Item ID: 21684
Item Type: Article (Research - C1)
ISSN: 1538-3881
Keywords: astrometry, celestial mechanics, minor planets, asteroids: general
Date Deposited: 25 Apr 2012 21:57
FoR Codes: 02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl Extraterrestrial Geology) @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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