The 1808 apparition and the long-term physical evolution of periodic comet Grigg-Skjellerup

Details The 1808 apparition and the long-term physical evolution of periodic comet Grigg-Skjellerup The 1808 apparition and the long-term physical evolution of periodic comet Grigg-Skjellerup

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987baicz..38...65k&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 38, no. 2, 1987, p. 65-75.

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11

Grigg-Skjellerup Comet, Orbital Mechanics, Star Clusters, Stellar Evolution, Astronomical Observatories, Comet Tails, Error Analysis, Field Of View, Comets, Grigg-Skjellerup, Evolution, 1808Iii, Motion, Orbital Elements, Comparisons, Physical Properties, Brightness, Magnitude, Orbits, History, Diagrams, Earth-Based Observations, Telescope Methods

Scientific paper

Evidence for the identity of comet 1808 III, observed solely by Pons on 1808 February 6 and 9, with P/Grigg-Skjellerup is presented. The very good fit with three independent backward integrations of its motion, together with all circumstantial evidence, makes this identification doubtless. An extension of the observing history of P/Grigg-Skjellerup to 36 revolutions (more than for any other comet except P/Encke) has made it possible to investigate the long-term physical evolution of this comet. Contrary to earlier results of other authors, indicating a secular brightness decrease of 5 to 7 magnitudes per century, a barely discernible fading by less than 0.5 magnitude per century, with fluctuations of + or - 0.6 magnitude during the individual returns, was found. Implications of this result for the general problem of comet evolution are discussed.

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