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Evolution of Comets into Asteroids?

Published online by Cambridge University Press:  12 April 2016

B.G. Marsden
B.G. Marsden*
Affiliation:
Smithsonian Astrophysical Observatory

Extract

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There has long been speculation as to whether comets evolve into asteroidal objects. On the one hand, in the original version of the Oort (1950) hypothesis, the cometary cloud was supposed to have formed initially from the same material that produced the minor planets; and an obvious corollary was that the main physical difference between comets and minor planets would be that the latter had long since lost their icy surfaces on account of persistent exposure to strong solar radiation (Öpik, 1963). However, following a suggestion by Kuiper (1951), it is now quite widely believed that, whereas the terrestrial planets and minor planets condensed in the inner regions of the primordial solar nebula, icy objects such as comets would have formed more naturally in the outer parts, perhaps even beyond the orbit of Neptune (Cameron, 1962; Whipple, 1964a). Furthermore, recent studies of the evolution of the short-period comets indicate that it is not possible to produce the observed orbital distribution from the Oort cloud, even when multiple encounters with Jupiter are considered (Havnes, 1970). We must now seriously entertain the possibility that most of the short-period orbits evolved directly from low-inclination, low-eccentricity orbits with perihelia initially in the region between, say, the orbits of Saturn and Neptune, and that these comets have never been in the traditional cloud at great distances from the Sun.

Type
Part II-Origin of Asteroids Interrelations with Comets, Meteorites, and Meteors
Information
International Astronomical Union Colloquium , Volume 12: Physical Studies of Minor Planets , 1971 , pp. 413 - 421
Copyright
Copyright © NASA 1971

References

Cameron, A.G.W. 1962, The Formation of the Sun and Planets. Icarus 1, 13–69.CrossRefGoogle Scholar
Gehrels, T., Roemer, E., Taylor, R.C., and Zellner, B.H. 1970, Minor Planets and Selected Objects. IV. Asteroid (1566) Icarus. Astron. J. 75, 186–195.CrossRefGoogle Scholar
Havnes, O. 1970, The Effect of Repeated Close Approaches to Jupiter on Short-Period Comets. Icarus 12, 331–337.CrossRefGoogle Scholar
Houten, C.J. van, Houten-Groeneveld, I. van, Herget, P., and Gehrels, T. 1970, Palomar-Leiden Survey of Faint Minor Planets. Astron. Astrophys. Suppl. 2, 339–448.Google Scholar
Huebner, W.F. 1967, Diminution of Cometary Heads Due to Perihelion Passage. Z. Astrophys. 65, 185–193.Google Scholar
Klemola, A.R. 1965, Periodic Comet de Vico-Swift (1965e). IAU Circ. 1914.Google Scholar
Kowal, C.T. 1970a, Periodic Comet du Toit-Neujmin-Delporte (1970i). IAU Circ. 2264.Google Scholar
Kowal, C.T. 1970b, Periodic Comet Jackson-Neujmin (1970k). IAU Circ. 2277.Google Scholar
Kresák, L. 1967, Relation of Meteor Orbits to the Orbits of Comets and Asteroids. Smithson. Contrib. Astrophys. 11, 9–34.Google Scholar
Kuiper, G.P. 1951, On the Origin of the Solar System. Astrophysics (ed., Hynek, J.), pp.357–424. McGraw-Hill Book Co., Inc. New York.Google Scholar
Marsden, B.G. 1963, On the Orbits of Some Long-Lost Comets. Astron. J. 68, 795–801.Google Scholar
Marsden, B.G. 1969, Comets and Nongravitational Forces. II. Astron. J. 74, 720–734.Google Scholar
Marsden, B.G. 1970a, Comets and Nongravitational Forces. III. Astron. J. 75, 75–84.Google Scholar
Marsden, B.G. 1970b, On the Relationship Between Comets and Minor Planets. Astron. J. 75, 206–217.CrossRefGoogle Scholar
Marsden, B.G. 1971a, Nongravitational Effects on Comets: The Current Status. IAU Symp. no. 45, in press.Google Scholar
Marsden, B.G. 1971b, New Light on Biela’s Comet. Sky and Telescope 41, 84–85.Google Scholar
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.Google Scholar
Öpik, E.J. 1963, The Stray Bodies in the Solar System. Pt. 1. Survival of Cometary Nuclei and the Asteroids. Advances in Astronomy and Astrophysics (ed., Kopal, Z.), vol. 2, pp. 219–262. Academic Press, Inc. New York.Google Scholar
Roemer, E. 1964, Periodic Comet Holmes (1964i). IAU Circ. 1876.Google Scholar
Roemer, E. 1968, Periodic Comet Tempel 1. IAU Circ. 2121.Google Scholar
Schubart, J. 1965, Periodic Comet Tempel-Tuttle (1965i). IAU Circ. 1926.Google Scholar
Sekanina, Z. 1969, Dynamical and Evolutionary Aspects of Gradual Deactivation and Disintegration of Short-Period Comets. Astron. J. 74, 1223–1234.Google Scholar
Sekanina, Z. 1970, Dynamics of Meteor Streams and New Asteroid-Meteor and Comet-Meteor Associations. Bull. Amer. Astron. Soc. 2, 217–218.Google Scholar
Sekanina, Z. 1971a, A Model for the Nucleus of Encke’s Comet. IAU Symp. no. 45, in press.Google Scholar
Sekanina, Z. 1971b, Rotation Effects in the Nongravitational Parameters of Comets. IAU Symp. no. 45, in press.Google Scholar
Sekanina, Z. 1971c, Dynamical Evolution of Extinct Comets. Bull. Amer. Astron. Soc. 3, 271.Google Scholar
Tuček, K. 1961, Multiple Fall of Příbram Meteorites Photographed. 2. Morphological and Mineralogical Composition of the Meteoritic Stones of Příbram. Bull. Astron. Inst. Czech. 12, 196–207.Google Scholar
Vsekhsvyatskij, S.K. 1958, Fizicheskie Kharakteristiki Komet. Gosudarstvennoe IzdatePstvo Fiziko-Matematicheskoj Literatury. Moskva. (Also available as NASA TT F-80,1964.)Google Scholar
Whipple, F.L. 1950, A Comet Model. I. The Acceleration of Comet Encke. Astrophys. J. 111, 375–394.Google Scholar
Whipple, F.L. 1954, Photographic Meteor Orbits and Their Distribution in Space. Astron. J. 59, 201–217.Google Scholar
Whipple, F.L. 1964a, Evidence for a Comet Belt Beyond Neptune. Proc. Nat. Acad. Sci. USA 51, 711–718.Google Scholar
Whipple, F.L. 1964b, Brightness Changes in Periodic Comets. Astron. J. 69, 152.Google Scholar
Whipple, F.L., and Douglas-Hamilton, D.H. 1966, Brightness Changes in Periodic Comets. Mem. Soc. Roy. Sci. Liège Sei. 5, 12, 469–480.Google Scholar
Whipple, F.L., and Hamid, S.E. 1952, On the Origin of the Taurid Meteor Streams. Roy. Observ. Helwan Bull. 41.Google Scholar
Yeomans, D.K. 1971, Nongravitational Forces Affecting the Motions of Periodic Comets Giacobini-Zinner and Borrelly. Astron. J. 76, 83–86.Google Scholar