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Comets, Meteors and Meteorites, Interplanetary Dust; Structure and Composition

  • Albrecht Unsöld
Part of the Heidelberg Science Library book series (HSL)

Abstract

We begin with a short review of cometary orbits and some immediate inferences.
  1. a)

    The orbits of long-period comets with periods of the order 102 to 106 years show randomly distributed inclinations i, direct and retrograde motions being about equally likely. The eccentricities e are a little less than or nearly equal to 1 so that we have to do with elongated ellipses, or parabolas as limiting cases. Hyperbolic orbits (e> 1) are produced only occasionally as derivative consequences of perturbations by the large planets. Since at a large distance from the Sun the Velocity is very small, the comets must come from a cloud of such bodies that accompanies the Sun in its journey through the stellar system

     
  2. b)

    The short-period comets mostly move in direct elliptic orbits of small inclination (i≈15°) Whose aphelia lie near the path of one of the lame planets. The cometary families of Jupiter, Saturn,.. evidently result from the capture of long-period comets. Since in the course of time such comets are dissipated by breaking-up and evaporation of their material, the swarm of short-period comets must be continually replenished by further captures.

     

Keywords

Solar Wind Cometary Tail Iron Meteorite Interplanetary Dust Retrograde Motion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Comets, Meteors and Meteorites, Interplanetary Dust; Structure and Composition

  1. Hawkins, G. S.: Meteors, comets and meteorites. New York-San FranciscoToronto-London: McGraw-Hill 1964.Google Scholar
  2. Lovell, A. C. B.: Meteor astronomy. Oxford: Clarendon Press 1954.Google Scholar
  3. Richter, N. B.: The nature of comets (English translation). London: Methuen 1963.Google Scholar
  4. La physique des comètes,Col. Internat. d’Astrophysique Liège 1952.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1969

Authors and Affiliations

  • Albrecht Unsöld
    • 1
  1. 1.Institute for Theoretical Physics and University ObservatoryKielGermany

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