n MNASSA : Monthly Notes of the Astronomical Society of South Africa - ASSA Observations of Comet 9P Tempel 1




Extracted from text ... mnassa vol 64 nos 11 & 12 182 ASSA Observations of Comet 9P Tempel 1 Tim Cooper Director: Comet and Meteor Section Bredell Observatory tpcoope@mweb.co.za Background Comet 9P Tempel 1 was discovered by Ernst Wilhelm Tempel on 1867 April 3.9. It was then determined to be of short period with an orbital period of 5.68 years. The comet made close approaches to Jupiter in 1881, 1941 and 1953, ultimately changing the orbital period to the current 5.50 years. This period means that the comet makes alternate favourable and unfavourable apparitions, with favourable apparitions separated by almost exactly 11 years. ..


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