The Mass of Asteroid 10 Hygiea

Details The Mass of Asteroid 10 Hygiea The Mass of Asteroid 10 Hygiea

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dda....36.0505c&link_type=abstract

American Astronomical Society, DDA meeting #36, #05.05; Bulletin of the American Astronomical Society, Vol. 37, p.524

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We estimate the mass of the fourth largest asteroid, 10 Hygiea, to be 9.02± 0.26 × 1019 kg (GM = 6.02 ± 0.17 km3/s2 or 0.454± 0.013 × 10-10; GM&sun;). While the least-squares estimate is consistent with values published elsewhere [1], the precision of our result is an order of magnitude finer than other results based on a single perturbed asteroid. This estimate relies wholly upon a close approach to asteroid 3946 Shor that took place 1998 Mar 29.90726 TDB at a distance of 0.014399 AU and relative velocity 0.914 km/s. Because of the substantial effect of that encounter, the mass estimate is insensitive to mass variations in other large Shor perturbers. The precision of the result was afforded by a series of high precision astrometric observations of Hygiea and Shor obtained at Table Mountain Observatory from 1996 through 2004. The IRAS-derived diameter of 407 ± 7 km [2] leads to a bulk density estimate of 2.55± 0.15 g/cm3.
[1] G. Michalak (2001) A&A 374, 703--711.
[2] E. Tedesco et al. (2002) AJ 123, 1056--1085.

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