On the Origin of the Last Meteorite Parent Bodies

Details On the Origin of the Last Meteorite Parent Bodies On the Origin of the Last Meteorite Parent Bodies

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sosyr..36..478g&link_type=abstract

Solar System Research, v. 36, Issue 6, p. 478-486 (2002).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

The existence of gaps in the perihelion distribution of the orbits of multikilometer-sized asteroids that approach the orbits of terrestrial-group planets is confirmed. This property of the orbits of ``large'' asteroids suggests the existence among them of a family of last meteorite parent bodies. Astrophysical data were considered for S-asteroids of the Main Belt and those that approach terrestrial planets. The u-x color index, which is related to the position of the absorption band at 950 nm in the asteroid spectra, was chosen for a qualitative comparison of the surface composition of these asteroids (identical or differing composition). The u - x color-index distributions were analyzed statistically according to the perihelion (q) and mean heliocentric distances (a) of the S-asteroids. It is shown that these distributions are Λ-shaped, peaking at q ~ 1.8 AU and a ~ 2.2 AU. The wings of the distributions can be approximated by linear regressions. A comparison of the u - x color-index mean values for S-asteroids in the regions of the Earth and Mars and of the Main Belt prompts the conclusion that the last meteorite parent bodies in the vicinity of the orbits of the Earth and Mars come primarily from various regions of the asteroid Main Belt.

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