Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..412r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 1, p. 412-427.
Astronomy and Astrophysics
Astronomy
98
Asteroids, Size Distribution, Magnitude, Sky Surveys (Astronomy), Asteroids, Near Earth Asteroids, Neas, Size, Distribution, Parameters, Flux, Earth Crossers, Earth-Based Observations, Asteroid Belt, Impacts, Techniques, Calculations, Simulations, Orbits, Distance, Fragments, Orbital Elements, Origin, Source, Comets, Parent Bodies, Collisions, Abundance
Scientific paper
The discovery circumstances of the first asteroids ever observed outside the earth's atmosphere but within the neighborhood of the earth-moon system are described. Four natural objects with diameters in the range 5-50 m were detected during a search for earth-approaching asteroids conducted each month at the 0.91-m Spacewatch Telescope at Kitt Peak. An additional 19 earth approachers with sizes in the range 50 m to 5 km were discovered. These obervations determine the cumulative flux of asteroids near earth as a function of absolute magnitude. For asteroids larger than about 100 m, a power-law dependence with exponent of about 0.9 is observed, consistent with their evolution from the main-belt population. At about 10 m, the flux is more than two orders of magnitude greater than this power-law extrapolation.
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