Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991plas.rept...87m&link_type=abstract
In NASA, Washington, Reports of Planetary Astronomy, 1991 p 87-88 (SEE N92-12792 03-89)
Astronomy and Astrophysics
Astronomy
1
Aging, Astrometry, Chiron, Comets, Evolution (Development), Halley'S Comet, Space Observations (From Earth), Astronomical Photography, Brightness, Charge Coupled Devices, Comet Nuclei, Comet Tails
Scientific paper
Emphasis was on searching for systematic differences among two groups of comets: periodic comets which spend most of their time in the vicinity of the inner Solar System and the new comets which are believed to be passing through the inner Solar System for the first time. Such differences are expected, but have never been observed, in part because there has never been a systematic observational program aimed at addressing this question. Understanding possible physical and compositional differences between these two groups will lead to a better understanding of the cometary formation conditions in the early Solar System. The employed method studies the activity in the comets as a function of distance by obtaining charge coupled device (CCD) observations of the comets at frequent intervals on both the pre- and post-perihelion legs of their orbits in order to ascertain the distances at the onset and turn-off of activity through comparison with sublimation models.
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