Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985sci...227..930k&link_type=abstract
Science (ISSN 0036-8075), vol. 227, Feb. 22, 1985, p. 930, 931.
Astronomy and Astrophysics
Astronomy
1
Asteroids, Comets, Solar System, Encke Comet, Meteoroid Showers, Asteroids, Comets, Planet Crossers, Celestial Mechanics, Astronomy, Source, Origin, Oljato, Orbits, Eccentricity, Meteor Showers, Pvo, Comparisons, Procedure, Adonis, Characteristics, Parameters, Orbiters, Pioneer Venus, Magnetic Properties, Magnetic Fields, Earth Crossers, Solar Wind, Gases, Evolution, Spectra, Reflectivity, Classification, Radar Observations, Ice, Asteroid 1983Tb, Comet Nuclei, Comet Tails, Albedo, S Asteroids, Reflectance,
Scientific paper
Observational evidence suggesting that some planet-crossing asteroids may be comets which have lost their ice component due to the sun's heat and assumed tighter orbits is characterized in a general review. Consideration is given to asteroid Oljato (discovered in 1947), which has a highly eccentric orbit, is associated with a meteor shower and with seven interplanetary-magnetic-field disturbances, and exhibits an unusual visible spectrum and radar signature. Other possible ex-comets include Adonis and 1983TB, while the comets Arend-Rigaux, Neujmin 1, and Encke are considered likely candidates to become asteroids in the future. The need for a crossing-asteroid mechanism like the comet hypothesis is discussed in the light of the failure of celestial-mechanics simulations to explain the present number of such asteroids by perturbation of the orbits of normal belt asteroids.
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