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For similar reasons, it is difficult to measure the width and shape of a dust tail. Theoretical studies offer one way of exploring the length and shapes of cometary dust tails. In some cases, the dust tail is broken down into both synchrones and syndynes. According to Beatty and Bryant (2007), a synchrone contains dust particles given off at the same time. 43. An image of Comet McNaught (C/2006 P1) made on January 22, 2007, at the Mudgee Observatory, ©Grahame Kelaher. The synchrones are the nearly vertical features in the dust tail near the coma at left (credit: Grahame Kelaher).
29, 2007)c 1,600,000 (Nov. 9, 2007)c 120,000 (1981, 1987–1988, 1994–1995 and 2008)b 220,000 (Aug. 7, 1989)d 68,000 (1990–1991 and 1997)b 280,000 (Feb. 17, 2009)c 320,000 (Mar. 11. Coma diameters for selected comets â•›Computed from photographs published in The International Halley Watch Atlas of Large-Scale Phenomena ©1992 J. C. Brandt etÂ€al. b â•›Computed from values published in the International Comet Quarterly c â•›Computed from the writer’s personal visual estimates d â•›From Machholz (1995) e From Schmude etÂ€al.
I plotted the orbital inclination versus the argument of perihelion for these comets. After a close study of this plot, along with the longitude of the ascending node values, I concluded, based on the data collected up to mid-2008, that there are no new families for the unclassified comets. 61°). Of all of the unclassified Sungrazers, these two have the closest orbital constants. Because of their large difference in the W value, it is doubtful that they represent a new family of comets. Comets with No Future Predictions As of May 2008, almost four dozen comets were declared lost or destroyed.