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The Nucleus: Panel Discussion

Published online by Cambridge University Press:  12 April 2016

B. Donn

Extract

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My remarks will present some views of the behavior of the nucleus and problems with their explanation.

One thing we definitely know about comets is that there has to be a permanent structure which revolves around the sun in the comets orbit. Permanent means carrying over from apparition to apparition during the lifetime of the comet. I adopt some form of the “icy nucleus” model as proposed by Whipple. This structure reasonably fits most of the known cometary features although no completely consistent model accounting for all known phenomena in a satisfactory manner has yet been described. The icy nucleus does not appear to have any major flaws. It has a real advantageous feature in that detailed models can be constructed and their behavior more or less accurately predicted, e.g. (Donn 1963; Delsemme and Miller, 1971; Sekanina 1972, 1973; Huebner, 1975).

Type
Part II
Information
International Astronomical Union Colloquium , Volume 25 , Issue Part2: The Study of Comets , 1976 , pp. 611 - 621
Copyright
Copyright © NASA 1976

References

Barkas, W.H. and Bergen, M.J., 1964, NBS SP 6421.Google Scholar
Berger, R. 1961, P.N.A.S. 47, 1434.CrossRefGoogle Scholar
Bobrovnikov, N.T. 1931, Lirk Obs. Bull 17, 309.Google Scholar
Dalgarno, A. 1962, In Atomic and Molecular Processes, ed. Bates, D.R. (N.Y. Academic) p. 623.Google Scholar
Delsemme, A. H. and Miller, D. C. 1971, Planet. Space Sci. 19, 1229.CrossRefGoogle Scholar
Delsemme, A. M. and Wenger, P. 1970, Planetary Space Sci. 18, 717.CrossRefGoogle Scholar
Donn, B. 1963, Icarus 2, 396.CrossRefGoogle Scholar
Donn, B. 1968, Introductipn to Space Science, ed. Hess, W. N. and Mead, G. N. (Gordon and Breach, N. Y.) p 501 Google Scholar
Gleason, L.J. and Urch, I., 1971, Ast. and Space Sci. 11, 288.CrossRefGoogle Scholar
Goldstein, M.L., Ramaty, R., Fisk, L.A., 1970, Phys. Rev. Let. 24, 1193.CrossRefGoogle Scholar
Hogg, F.S. 1929, J.R..S. Can. 23, 55.Google Scholar
Huebner, W.F., 1975, Their ProceedingsGoogle Scholar
Jacchia, L.J., 1974, Sky and Telescope 47, 216.Google Scholar
Kajmakov, E.A. and Sharkov, V.I., 1972a, In I.A.U. Symposium 45, The Motion Evolution of Orbits and Origin of Comets, ed. Chebotarev, G.A., Kazimirchak-Polonskaya, E. I. and Marsden, B. G. (Dordrecht: Reidel) p. 308 CrossRefGoogle Scholar
Kajmakov, E.A., Sharkov, V.I. and Zhuralev, S.S. 1972b, In I.A.U. Symposium 45, The Motion, Evolution of Orbits and Origin of Comets, ed. Chebotarev, G.A., Kazimirchak-Polonskaga, E.I. and Marsden, B.G. (Dordrecht, Reidel) p. 316.CrossRefGoogle Scholar
Oort, J.M. 1951, B.A.N, 11, 91.Google Scholar
Oro, J. 1963, Nature 197, 971.CrossRefGoogle Scholar
Peterson, L.E., Trombka, J.I., Metzger, A.E., Arnold, J.R., Matteson, J.I., and Reedy, R.C., 1974 in NASA SP 339 ed. Streaker, F.W. and Trombka, J.I. (Washington, NASA) p. 41.Google Scholar
Sekanina, Z. 1972, In AGU Symposium No. 45, The Motion, Evolution of Orbits and Origin of Comets, ed. Chebotareo, G.A., Kazimirchak-Polonskaya, E.I. and Marsden, B.G. p. 301.CrossRefGoogle Scholar
Shul’man, L.M., 1972, In IAU Symposium No. 45, The Motion, Evolution of Orbits and Origin of Comets, ed. Chebatarev, G.A., Kazimirchak-Polonskaya, E.I. and Marsden, B.G. (Dordrecht; Reidel) p. 265.10.1007/978-94-010-2873-8_47CrossRefGoogle Scholar
Stief, L.J. 1972, Nature 237, 29.10.1038/237029a0CrossRefGoogle Scholar
Swings, P. 1948, Ann. d’Astrophys. 11, 124.Google Scholar
Swings, P. and Haser, L. 1957, Atlas of Representative Cometary Spectra Liege.Google Scholar
Whipple, F.L. 1962, In the Moon, Meteorites and Comets, ed. Middlehurst, B.M. and Kuiper, G.P. (Chicago, Univ. of Chicago Press) p. 639.Google Scholar