REFERENCES

A'Hearn, M.F., R.L. Millis, D.G. Schleicher, D.J. Osip, and P.V. Birch. 1995. The ensemble properties of comets: Results from narrowband photometry of 85 comets, 1976–1992. Icarus 118:223–270.


Biver, N., D. Bockelée-Morvan, P. Colom, J. Crovisier, J.K. Davies, W.R.F. Dent, D. Despois, E. Gérard, E. Lellouch, H. Rauer, R. Moreno, and G. Paubert. 1997. Evolution of the outgassing of comet Hale-Bopp (C/1997 O1) from radio observations. Science 275:1915–1918.

Brandt, J.C., M.F. A'Hearn, C.E. Randall, D.G. Schleicher, E.M. Shoemaker, and A.I.F. Stewart. 1996a. On the existence of small comets and their interaction with planets. Earth, Moon, and Planets 72:243–249.

Brandt, J.C., M.F. A'Hearn, C.E. Randall, D.G. Schleicher, E.M. Shoemaker, and A.I.F. Stewart. 1996b. Small comets (SCs): An unstudied population in the solar system inventory. Pp. 289–297 in Completing the Inventory of the Solar System, Astronomical Conference Series, T.W. Rettig and J.M. Hahn (eds.). San Francisco: Astronomical Society of the Pacific.

Bus, S.J., M.F. A'Hearn, E. Bowell, and S.A. Stern. 1998. (2060) Chiron: Evidence for activity near aphelion. Icarus, submitted.


Chyba, C., and C. Sagan. 1992. Endogenous production, exogenous delivery and impact-shock synthesis of organic molecules: An inventory for the origins of life. Nature 355:125–132.

Chyba, C.F., P.J. Thomas, L. Brookshaw, and C. Sagan. 1990. Cometary delivery of organic molecules to the early Earth. Science 249:366–373.


Davis, D.R., and P. Farinella. 1997. Collisional evolution of Edgeworth-Kuiper Belt objects. Icarus 125:50–60.


Fomenkova, M.N., J.F. Kerridge, K. Marti, and L.-A. McFadden. 1992. Compositional trends in rock-forming elements of comet Halley dust. Science 258:266–269.


Grimm, R.E., and H.Y. McSween, Jr. 1989. Water and the thermal evolution of carbonaceous chondrite parent bodies. Icarus 82:244–280.

Grimm, R.E., and H.Y. McSween, Jr. 1993. Heliocentric zoning of the asteroid belt by aluminium-26 heating. Science 259:653–655.


Huebner, W.F., D.C. Boice, and C.M. Sharp. 1987. Polyoxymethylene in Comet Halley. Astrophys. J. 320:L149–L152.


Jessberger, E.K., and J. Kissel. 1991. Chemical properties of cometary dust and a note on carbon isotopes. Pp. 1075–1092 in Comets in the Post-Halley Era, R.L. Newburn, Jr., M. Neugebauer, and J. Rahe (eds.). Dordrecht: Kluwer Academic Publishers.


Keller, H.U., C. Arpigny, C. Barbieri, R.M. Bonnet, S. Cazes, M. Coradini, C.B. Cosmovici, W.A. Delamere, W.F. Huebner, D.W. Hughes, C. Jamar, D. Malaise, H.J. Reitsema, H.U. Schmidt, W.K.H. Schmidt, P. Seige, F.L. Whipple, and K. Wilhelm. 1986. First Halley multicolour camera imaging results from Giotto. Nature 321:320–326.

Kouchi, A., J.M. Greenberg, T. Yamamoto, and T. Mukai. 1992. Extremely low thermal conductivity of amorphous ice—Relevance to comet evolution. Astrophys. J. 388:L73–L76.


MacPherson, G.J., A.M. Davis, and E.K. Zinner. 1995. The distribution of aluminium-26 in the early Solar System—A reappraisal. Meteoritics 30:365–386.

Meech, K.J. 1997. Physical properties of cometary nuclei. In Asteroids, Comets, Meteors, A.C. Levasseur-Regourd (ed.). '96, COSPAR Colloquium Series, Paris: COSPAR.

Meier, R., P. Eberhardt, D. Krankowsky, and R.R. Hodges. 1993. The extended formaldehyde source in comet P/Halley. Astron. Astrophys. 277:677–690.

Moore, M.H., B. Donn, R. Khanna, and M.F. A'Hearn. 1983. Studies of proton-irradiated cometary-type ice mixtures. Icarus 54:388–405.


Oort, J.H. 1950. The structure of the cloud of comets surrounding the solar system and a hypothesis concerning its origin. Bull. Astron. Inst. Neth. 11:91–110.


Prialnik, D., and M. Podolak. 1995. Radioactive heating of porous comet nuclei. Icarus 117:420–430.

Prialnik, D., A. Bar-Nun, and M. Podolak. 1987. Radiogenic heating of comets by 26Al and implications for their time of formation. Astrophys. J. 319:993–1002.


Rickman, H. 1991. The thermal history and structure of cometary nuclei. Pp. 733–760 in Comets in the Post-Halley Era, R.L. Newburn, Jr., M. Neugebauer, and J. Rahe (eds.). Dordrecht: Kluwer Academic Publishers.


Sekanina, Z. 1995. Evidence on sizes and fragmentation of the nuclei of comet Shoemaker-Levy 9 from Hubble Space Telescope images. Astron. Astrophys. 304:296–316.

Stern, S.A., and J.M. Shull. 1988. The thermal evolution of comets in the Oort Cloud by stars and supernovae. Nature 332:407–411.


Timmes, F.X., S.E. Woosley, D.H. Hartmann, R.D. Hoffman, T.A. Weaver, and F. Matteucci. 1995. 26Al and 60Fe from supernova explosions. Astrophys. J. 449:204–210.


Weidenschilling, S.J. 1997. The origin of comets in the solar nebula: A unified model. Ic

arus 127:290–306.

Weissman, P.R. 1990. The cometary impactor flux at Earth. Pp. 171–180 in Global Catastrophes in Earth History: An Interdisciplinary Conference on Impacts, Volcanism, and Mass Mortality, V.L. Sharpton and P.D. Ward (eds.). Geol. Soc. Am., Spec. Pap. 247.

Weissman, P.R. 1994. The comet and asteroid impact hazard in perspective. Pp. 1191–1212 in Hazards Due to Comets and Asteroids, T. Gehrels (ed.). Tucson, Arizona: University of Arizona Press.

Wood, J.A. 1996. Unresolved issues in the formation of chondrules and chondrites. In Chapter 7, Chondrites and the Protoplanetary Disk, R.H. Hewins, R.H. Jones, and E.R.D. Scott (eds.). Cambridge, England: Cambridge University Press.


Yabushita, S. 1993. Thermal evolution of cometary nuclei by radioactive heating and possible formation of organic chemicals. Mon. Notes R. Astron. Soc. 260:8819–8825.



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement