On the relative numbers of C types and S types among near-earth asteroids

Details On the relative numbers of C types and S types among near-earth asteroids On the relative numbers of C types and S types among near-earth asteroids

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1905l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Nov. 1989, p. 1905-1911. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

17

Asteroid Belts, Eccentric Orbits, Gravitational Effects, Terrestrial Planets, Dynamic Characteristics, Solar System

Scientific paper

The discovery circumstances of the near-earth asteroids (NEAs) were modeled in order to investigate the observational selection effects associated with NEAs. It is suggested that these selection effects are responsible for the apparent overabundance of S types among the NEAs and that this overabundance is in part a result of the larger phase darkening of the C types over the S types. The large phase angles and preferential phase darkening of the C type NEAs force some of them below the threshold of detectability (in a magnitude-limited survey), thus exaggerating the number of S type NEAs.

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