PDS_VERSION_ID = PDS3 OBJECT = REFERENCE REFERENCE_KEY_ID = "BOBROVNIKOFF1931" REFERENCE_DESC = " Bobrovnikoff, N.T., Publications of the Lick Observatory, 17, 305, 1931." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "BRANDTETAL1980" REFERENCE_DESC = " Brandt, J.C., R.L. Newburn, and L.D. Friedman, 'The International Halley Watch, Report of the Science Working Group,' NASA TM 82181, 1980." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "BRANDTETAL1992" REFERENCE_DESC = " Brandt, J.C., M.B. Niedner, Jr., and J. Rahe, 'The International Halley Watch Atlas of Large-Scale Phenomena', University of Colorado-Boulder, Laboratory for Atmospheric and Space Physics, Boulder, Colorado, April 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "HANNER&TOKUNAGA1991" REFERENCE_DESC = " Hanner, M.S., and A.T. Tokunaga, 'Infrared Techniques for Comet Observations', In 'Comets in the Post-Halley Era, Newburn, R. L., Neugebauer, M., and Rahe, J. (eds.), Kluwer Academic Publishers, Dordrecht, pp. 67-91, 1991." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "HOLDENRIED&CRULL1986" REFERENCE_DESC = " Holdenried, E.R., and H.E. Crull, 'U. S. Naval Observatory Halley Watch Astrometric Catalog', Astronomical Journal, 92, pp. 1191-1200, 1986." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "JPL D-400-450" REFERENCE_DESC = " Sekanina, Zdenek (ed.), 'The Comet Halley Archive Summary Volume', Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, JPL D-400-450, August 1991." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "LARSON&MINTON1972" REFERENCE_DESC = " Larson, S.M., and R.B. Minton, 'In Comets: Scientific Data and Missions, Kuiper, G.P. and Roemer, E. (Eds.), University of Arizona, Tucson, pp. 183, 1972." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "MARSDENETAL1973" REFERENCE_DESC = " Marsden, B.G., Z. Sekanina, and D.K. Yeomans, 'Comets and nongravitational forces', Astronomical Journal, 78, pp. 211-225, 1973." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "OSBORNETAL1990" REFERENCE_DESC = " Osborn, W.H., M.F. A'Hearn, U. Carsenty, R.L. Millis, D.G. Schleicher, P.V. Birch, H. Moreno, and A. Gutierrez-Moreno, Standard Stars for Photometry of Comets, Icarus, 88, 288, 1990." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "RAHEETAL1969" REFERENCE_DESC = " Rahe, J., B. Donn, and K. Wurm, 'Atlas of Cometary Forms', NASA SP-198, U.S. Government Printing Office, Washington D.C., 128 pp., 1969." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "ROESER1984" REFERENCE_DESC = " Roeser, S.F., 'Study into the accuracy of astrometric observations of comets', ESOC Contract No. 5759/83/D/IM(SC), Final Report, May 31, 1984." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "ROESER1987" REFERENCE_DESC = " Roeser, S.F., 'Catalogue of astrometric observations of comet P/Halley at its apparition 1909-1911', Astronomy and Astrophysics Journal, Supplement, Series 71, pp. 363-395, 1987." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SEKANINA1979" REFERENCE_DESC = " Sekanina, Zedenek, Icarus, 37, 420, 1979." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SEKANINA1981A" REFERENCE_DESC = " Sekanina, Zedenek, Annual Review of Earth and Planetary Science, 9, 113, 1981." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SEKANINA1981B" REFERENCE_DESC = " Sekanina, Zedenek, Astronomical Journal, 86, 1741, 1981." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "TOKUNAGA1987" REFERENCE_DESC = " Tokunaga, A.T., 'Infrared Telescope Facility Photometry Manual', Institute for Astronomy, University of Hawaii, 1987." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "WHIPPLE1978" REFERENCE_DESC = " Whipple, F.L., Nature, 273, 134, 1978." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "WHIPPLE1980" REFERENCE_DESC = " Whipple, F.L., Astronomical Journal, 85, 305, 1980." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "WISNIEWSKI&ZELL1985" REFERENCE_DESC = " Wisniewski, W. and B. Zellner, Standard stars for cometary photometry, Icarus, 63, 333-338, 1985." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "YEOMANS1977" REFERENCE_DESC = " Yeomans, D.K., 'Comet Halley: The orbital motion', Astronomical Journal, 82, pp. 435-440, 1977." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "YEOMANS1981" REFERENCE_DESC = " Yeomans, D.K., 'The Comet Halley Handbook', Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, JPL D-400-91, 1981." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "YEOMANS1983" REFERENCE_DESC = " Yeomans, D.K., 'The Comet Halley Handbook', 2nd edition, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, JPL D-400-91, Rev. 1, 1983." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "YEOMANSETAL1984" REFERENCE_DESC = " Yeomans, D.K., R.M. West, R.S. Harrington, and B.G. Marsden, 'Cometary Astrometry: Proceedings of a workshop held June 18-19, 1984, at the European Southern Observatory Headquarters', Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, JPL D-84-82, 1984." END_OBJECT = REFERENCE END