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Kostiuk, Physical properties of the nucleus of comet 2P/Encke. Icarus, 147, 145160, 2000." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "FITZSIMMONSETAL1994" REFERENCE_DESC = "Fitzsimmons A. and I. P. Williams, The nucleus of comet P/Levy 1991 XI. Astron. Astrophys., 289, 304310, 1994." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "GUTIERREZETAL2003" REFERENCE_DESC = "Gutierrez P. J., J. de Leon, L. Jorda, J. Licandro, L. M. Lara, and P. Lamy, New spin period determination for comet 6P/dArrest. Astron. Astrophys., 407, L37L40, 2003." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "HSIEHETAL2004" REFERENCE_DESC = "Hsieh H. H., D. C. Jewitt, and Y. R. Fernandez, The strange case of 133P/Elst-Pizarro: A comet amongst the asteroids. Astron. J., in press, 2003." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "JEWITT&LUU1989" REFERENCE_DESC = "Jewitt D. and Luu J. (1989) A CCD portrait of comet P/Tempel 2. Astron. J., 97, 17661841." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "JEWITT&MEECH1987" REFERENCE_DESC = "Jewitt D. C. and K. J. Meech, CCD photometry of comet P/Encke. Astron. J., 93, 15421548, 1987." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "JEWITT&SHEPPARD2003" REFERENCE_DESC = "Jewitt D. and S. Sheppard, The nucleus of comet 48P/Johnson. Astron. J., in press, 2003." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "JEWITTETAL2003" REFERENCE_DESC = "Jewitt D., S. Sheppard, and Y. Fernandez, 143P/Kowal- Mrkos and the shapes of cometary nuclei. Astron. J., 125, 33663377, 2003." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "LAMYETAL1998B" REFERENCE_DESC = "Lamy P. L., Toth I., and Weaver H. A. (1998a) Hubble Space Telescope observations of the nucleus and inner coma of comet 19P/1904 Y2 (Borrelly). Astron. Astrophys., 337, 945954." 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