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Minor planets and comets in libration about the 2:1 resonance with JupiterWe examine the orbits of minor planets in a search for objects librating about the 2:1 mean-motion resonance with Jupiter. Some 30 candidates are found among the Palomar-Leiden Survey and other unnumbered minor planets. Although almost all the orbits are very uncertain, there does seem to be an indication that librators of low orbital eccentricity do exist, contrary to the hypothesis by Giffen. We also tabulate data describing 12 comets that are temporarily librating about the 2:1 resonance. Finally, we present a discussion of what are apparently 'apocentric' librations. This type of libration, of which we find seven representatives among the numbered minor planets, can occur only for sufficiently small eccentricity. For such bodies, the role of Jupiter's eccentricity is vital; it is associated with a continuing alternation between apocentric libration and an oscillation of the line of apsides.
Document ID
19750061072
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Franklin, F. A.
Marsden, B. G.
(Smithsonian Astrophysical Observatory and Harvard College Observatory Cambridge, Mass., United States)
Williams, J. G.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Bardwell, C. M.
(Cincinnati Observatory Cincinnati, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
September 1, 1975
Publication Information
Publication: Astronomical Journal
Volume: 80
Subject Category
Lunar And Planetary Exploration
Accession Number
75A45144
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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