|Past, Present, and Future Orbits by Kazuo Kinoshita|
Christian Heinrich Friedrich Peters (Capodimonte Observatory, Naples, Italy) discovered this comet on 1846 June 26.92, in Libra. He described it as very faint, without a nucleus. He said it was very similar in appearance to a nebula situated a degree away, that was classified Herschel VI, no. 19. Peters confirmed his discovery on June 27.87 and June 28.94.
[Perihelion Date=1846 June 3.68; Period=7.88 years]
Using his three initial positions, Peters computed the first parabolic orbit which indicated a perihelion date of 1846 April 12.80. After observations had been extended into July, Peters revised his orbit and found a perihelion date of May 31.00. Later in the year, Heinrich Ludwig d'Arrest (Berlin, Germany) computed two different sets of parabolic elements, neither of which satisfactorily represented the observations, but did meet with success with an elliptical orbit. The perihelion date was June 1.60, and the orbital period was 15.89 years. D'Arrest revised the orbital period to 12.85 years in 1848. During 1887, with the comet already having been missed at two probable returns, Berberich used 16 positions obtained during 1846, but no planetary perturbations, and determined the period as 13.38 years. He said the period was uncertain by about one year. Berberich added that this orbit indicated the comet made close approaches to Saturn in 1856 and 1883. Another investigation took place nearly a century later when Buckley examined the 1846 positions in 1976. He applied the perturbations by seven planets and concluded the orbital period had been 12.71 years; however, he still gave an uncertainty of about three years.
[Perihelion Date=1982 May 8.57; Period=8.12 years]
[Perihelion Date=1990 June 23.64; Period=8.13 years]
[Perihelion Date=1998 August 11.64; Period=8.12 years]
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