Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...55..448w&link_type=abstract
Icarus (ISSN 0019-1035), vol. 55, Sept. 1983, p. 448-454. NASA-supported research.
Astronomy and Astrophysics
Astronomy
16
Collision Rates, Comets, Orbit Perturbation, Perihelions, Solar Orbits, Comet Nuclei, Roche Limit, Solar Atmosphere, Spaceborne Astronomy, Sublimation, Comets, Impacts, Sun, Physical Properties, Dynamics, Sun Grazers, Perihelion, Gravity Effects, Tidal Effects, Collisions, Sublimation, Comet 1979Xi, Shock, Comet Nuclei
Scientific paper
Michels et al. (1982) observed the apparent impacting of the sun by a comet, and Sekanina (1982) showed that the comet, 1979XI, was probably a member of the Kreutz group of sun-grazing comets, although its perihelion of 0.35 solar radii was much smaller than the 1.2-1.9 solar radii common for this comet class. The perihelion change cannot be explained by planetary, stellar, or nongravitational perturbations. The most plausible explanation is collision with another body, probably a comet, at large heliocentric distance. The probability of such an event is, however, extremely small. The sublimation of the comet's nucleus before impact is discussed, and it is suggested that its ultimate destruction probably resulted from the shock of entry into the denser regions of the solar atmosphere, just above the photosphere.
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