Abstract
Since its discovery in 1867, periodic comet 9P/Tempel 1 has been observed at 10 returns to perihelion, including all its returns since 1967. The observations for the seven apparitions beginning in 1967 have been fit with an orbit that includes only radial and transverse nongravitational accelerations that model the rocket-like thrusting introduced by the outgassing of the cometary nucleus. The successful nongravitational acceleration model did not assume any change in the comet’s ability to outgas from one apparition to the next and the outgassing was assumed to reach a maximum at perihelion. The success of this model over the 1967–2003 interval suggests that the comet’s spin axis is currently stable. Rough calculations suggest that the collision of the impactor released by the Deep Impact spacecraft will not provide a noticeable perturbation on the comet’s orbit nor will any new vent that is opened as a result of the impact provide a noticeable change in the comet’s nongravitational acceleration history. The observing geometries prior to, and during, the impact will allow extensive Earth based observations to complement the in situ observations from the impactor and flyby spacecraft.
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References
Ahrens, T. J. and Harris, A. W.: 1994, in: Gehrels, T. (ed.), Hazards Due to Comets and Asteroids, University of Arizona Press, pp. 897–927.
Belton, M. J. S., Meech, K. J., Groussin, O., McFadden, L., Lisse, Ca., Fernandez, Y. et al.: 2005, Space Sci. Rev. 117, 137–160.
Carusi, A., Kresák, L., Perozzi, E., and Vealsecchi, G. B.: 1985, Long-Term Evolution of Short-Period Comets. Adam Hilger Ltd., Bristol England.
Kronk, G. W.: 2003, Cometography: A Catalog of Comets, Vol. 2: 1800–1899. Cambridge University press, Cambridge.
Lisse, C., A’Hearn, M. F., Farnham, T. L., Groussin, O., Meech, K. J., Fink, U. et al.: 2005, Space Sci. Rev. 117, 161–192.
Marsden, B. G.: 1963, Astronom. J. 68, 795.
Marsden, B. G., Sekanina, Z., and Yeomans, D. K.: 1973, Astronom. J. 78, 211.
Standish, E. M.: 1998, JPL Planetary and Lunar Ephemerides, DE405/LE405. Jet Propulsion Laboratory Interoffice Memorandum 312.F-98-048 dated August 26, 1998.
Yeomans, D. K.: 1991, A Chronological History of Comets, John Wiley, New York.
Yeomans, D. K. and Chodas, P. W.: 1989, Astronom. J. 98, 1083.
Yeomans, D. K., Chodas, P. W., Sitarski, G., Szutowicz, S., and Królikowska, M.: in press, Cometary Orbit Determination and Nongravitational Forces. in: Festou, M.(ed.), Comets II, University of Arizona Press.
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Yeomans, D.K., Giorgini, J.D. & Chesley, S.R. The History and Dynamics of Comet 9P/Tempel 1. Space Sci Rev 117, 123–135 (2005). https://doi.org/10.1007/s11214-005-3392-6
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DOI: https://doi.org/10.1007/s11214-005-3392-6