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110P/Hartley 3

Past, Present, and Future Orbits by Kazuo Kinoshita


     Malcolm Hartley discovered this comet on plates exposed on 1988 February 19 and 22 with the U.K. Schmidt Telescope Unit at Siding Spring. He estimated the total magnitude as 16.5 on the 19th. He added that the plate exposed on the 22nd revealed a tail extending 10 arc minutes towards the northwest.
     Following the announcement on February 23, Carolyn and Eugene Shoemaker found the comet on a plate exposed on the 19th, just a few hours prior to the earliest Siding Spring photo. The Shoemaker plate had been obtained with the 0.46-m Schmidt telescope at Palomar Observatory.

Historical Highlights

  • Using images reported by Hartley for the period of February 19 to the 25th, as well as the Shoemaker images, Daniel W. E. Green (Central Bureau for Astronomical Telegrams) computed the first orbit which was first published on March 1. It was an elliptical orbit indicating a perihelion date of 1987 August 1, a perihelion distance of 2.44 AU, and an orbital period of 6.76 years. Following the acquisition of further observations, Brian G. Marsden (Central Bureau for Astronomical Telegrams) computed a revised orbit which indicated a perihelion date of 1987 July 14, a perihelion distance of 2.45 AU, and an orbital period of 6.85 years. More refined orbits following the final observation on May 19 indicated this latter orbit was nearly on target, although the orbital period was 6.83 years.
  • J. V. Scotti (University of Arizona, USA) recovered this comet with the 0.91-m Spacewatch telescope at Kitt Peak on 1993 June 23 and 24. He gave the total magnitude as 19.5-19.7. Scotti also noted that the CCD image of the 23rd showed a coma diameter of 10 arc seconds, a tail extending 0.54 arc minute toward the west, and a nuclear magnitude of 22.1. The precise positions indicated the prediction for this return required a correction of +0.49 day.
  • The apparition of 1994 showed astronomers the comet could be followed for some time. With the recovery in 1993, observations contined until 1995 April 19, which gave a duration of visibility of 665 days.
  • The comet was next expected to pass perihelion on 2001 March 21 and it was recovered on 1998 May 30 by Christian Veillet (Mauna Kea, Hawaii, USA) using the 3.60-m Canada-France-Hawaii Telescope. The magnitude was given as 22.7 and the comet was found 1026 days prior to perihelion. The comet attained a maximum total magnitude of 13 during the spring of 2001.
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