Comet p / Crommelin 1983N

Details Comet p / Crommelin 1983N Comet p / Crommelin 1983N

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..36....9d&link_type=abstract

The Messenger, No. 36, P. 9, 1984

Computer Science

Scientific paper

Comet Crommelin has aperiod of approximately 27.4 years and consequently a well-studied orbit. It has an orbital excentricity e = 0.92, taking Crommelin on its excursions through the solar system out to a distance of 9.09 AU and in to a perihel ion distance of approximately 0.73 AU. The precise orbit details are given in IAU circular No. 3886. A comet's predicted brightness is unreliable, a function of distance from the sun, earth and albedo and naturally it is the albedo which is poorly known. But predictions for a comet with many previous passages are more reliable and the integrated visual brightness of Crommelin was predicted to be in the order of 7 to 11. It was recognized that Crommelin would serve nicely as a test object for the International Halley Watch network (IHW), i. e. its participating observers, equipment and data compatibility. Obviously the closer the comet to the sun the brighter it becomes but of course the more it moves into day. It is usual then when the comet is brightest to catch it either in the early morning as it rises before the sun, or just above the horizon in the early evening after the sun has set.

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