A very close approach took place on March 4, 2002, between Eunomia and (50278) 2000CZ12, at a nominal distance of 55200 km. The resulting perturbation in the mean motion of the smaller body was substantially larger than for the other detected events, amounting to ca. 0.9 arcsecs/y. The orbital elements of (50278) 2000CZ12 were fitted together with the mass of Eunomia on 106 of 110 observations spanning from 1950 to 2006, resulting in a mass of 3.25∙10^19 kg (1.64∙10^-11 Msun) with a formal 1-sigma relative uncertainty of 3.7%. The optimized mass is 30-60% larger and the formal error 4-7 times smaller than previous estimates.
New Mass Determination of (15) Eunomia based on a very close encounter with (50278) 2000CZ12 / Vitagliano, Aldo; REINER M., Stoss. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - STAMPA. - 455:(2006), pp. L29-L31. [10.1051/0004-6361:20065760]
New Mass Determination of (15) Eunomia based on a very close encounter with (50278) 2000CZ12
VITAGLIANO, ALDO;
2006
Abstract
A very close approach took place on March 4, 2002, between Eunomia and (50278) 2000CZ12, at a nominal distance of 55200 km. The resulting perturbation in the mean motion of the smaller body was substantially larger than for the other detected events, amounting to ca. 0.9 arcsecs/y. The orbital elements of (50278) 2000CZ12 were fitted together with the mass of Eunomia on 106 of 110 observations spanning from 1950 to 2006, resulting in a mass of 3.25∙10^19 kg (1.64∙10^-11 Msun) with a formal 1-sigma relative uncertainty of 3.7%. The optimized mass is 30-60% larger and the formal error 4-7 times smaller than previous estimates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
