Stony meteorite porosities and densities: A review of the data through 2001

Abstract

Stony meteorite porosities and densities:A review of the data through 2001

Hazardous near Earth asteroid mitigation campaign planning based on uncertain information on fundamental asteroid characteristics

“…The BPA structures for the micro density is formed by referring to 11 CM chondrites [34]. The micro porosity is simply assumed to be 15.5-30.5% [30] which is consistent with the work of Flynn et al [35]. This simple assumption is mainly due to the insufficient amount of sample data for unbiased micro porosities of CCs.…”

“…The BPA structures for the micro density are formed by referring to 437 samples of H, L, and LL chondrites [30]. In order to form the BPA structures for the micro porosity , micro porosities of 691 OCs [31] are referred and aggregated with additional data on micro porosities of 291 OCs from the different literature [32] by Dempster's rule of combination [22]. While most meteorites found on Earth spent long periods of time on the ground, and thus they are affected by considerable terrestrial weathering, it is noteworthy that the literature referred for of OCs used in this study is de-biased to such effects.…”

Main belt binary asteroidal systems with eccentric mutual orbits

“…Considering CI carbonaceous chondrites as meteorite analogs with a bulk density of 2.11 g/cm 3 and a micro-porosity of 10% in Britt and Consolmagno (2003), we derived a significant macro-porosity (~50-60%) suggesting a rubble-pile internal structure with ρ=0.9 g/cm 3 . As suggested in Marchis et al (2006a), P-type asteroids could be dormant comets containing significant amount of water ice.…”

“…The spectrum shows a relatively strong 0.7-micron phyllosilicate absorption band. In this case, spectrally different than (1) Ceres, (130) Elektra is most analogous to CM-chondrites (ρ average = 2.12 g/cm 3 , Britt and Consolmagno, 2003).…”

“…This density measurement is very close to the bulk density of (1) Ceres, another G-type asteroid, which was inferred by Thomas et al (2005) from the ellipsoidal shape of this large asteroid. CI-CM carbonaceous meteorites (Britt and Consolmagno, 2003) are the best candidates for meteorite analogs in terms of bulk density (~2.1 g/cm3), suggesting no macro-porosity in the interior of the primary.…”