Other
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aj.....80..729f&link_type=abstract
Astronomical Journal, vol. 80, Sept. 1975, p. 729-746.
Other
17
Asteroids, Comets, Jupiter (Planet), Librational Motion, Orbital Elements, Planetary Orbits, Circular Orbits, Eccentric Orbits, Resonance, Saturn (Planet), Tables (Data)
Scientific paper
We 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.
Bardwell C. M.
Franklin Fred A.
Marsden Brian G.
Williams James G.
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