Observations of Periodic Comet d'Arrest in 1678 and implications for its evolutionary history

Astronomy and Astrophysics – Astrophysics

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Comets, Orbital Elements, Solar Orbits, Brightness Distribution, Perihelions

Scientific paper

The present study demonstrates the identity of Comet 1678 La Hire with P/d'Arrest, making it the oldest known observation of a short-period comet of the Jupiter family. Different modifications of linkages of the strongly perturbed orbit over 25 unobserved perihelion passages, and four close encounters with Jupiter are applied and evaluated. The best one, starting with the 1851 osculating orbit, and assuming constant nongravitational forces in the past, represents the 1678 observations to +/-0.2 deg, well within their positional uncertainty. At the same time, the 1989 perihelion passage is represented to 0.01 d. It is inferred from the observations of P/d'Arrest from 1678 that at that time, 47 revolutions ago, both its absolute brightness and the shape of its light curve were the same as at present, within the range of observational accuracy.

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