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624 Hektor: A Binary Asteroid?

Published online by Cambridge University Press:  12 April 2016

A.F. Cook
A.F. Cook*
Affiliation:
Smithsonian Astrophysical Observatory

Extract

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Dunlap and Gehrels (1969) have published lightcurves of the Trojan asteroid 624 Hektor. They proposed a conventional explanation in which Hektor is regarded as having the shape of a cigar. Two circumstances suggest, but do not prove, that Hektor is a binary asteroid. (1) The cigar shape at the conventional density of stony meteorites (3.7 g-cm-3) appears to produce stresses that may well exceed the crushing strength of meteoritic stone. (2) The lightcurves exhibit an asymmetry changing with time that suggests librations of two ellipsoidal components. Observations are clearly required to look for these periodicities when we shall again be nearly in the plane of Hektor’s revolution (or rotation) in 1973. An additional supporting lightcurve is desirable in 1972 and also in 1974. The periods of libration are probably nearly 1 day, if they exist, so that observations should be made from more than one geographic longitude in 1973. The present paper is an exposition on these considerations.

Type
Part I-Observations
Information
International Astronomical Union Colloquium , Volume 12: Physical Studies of Minor Planets , 1971 , pp. 155 - 163
Copyright
Copyright © NASA 1971

References

Chandrasekhai, S. 1965, On the Equilibrium and Stability of the Riemann Ellipsoids. Astrophys. J. 142, 890–921.CrossRefGoogle Scholar
Cook, A.F., and Franklin, F. 1970, An Explanation of the Light Curve of Iapetus. Icarus 13, 282–291.Google Scholar
Dunlap, J.L., and Gehrels, T. 1969, Minor Planets III. Lightcurves of a Trojan Asteroid. Astroa J. 74, 796–803.Google Scholar
Jardetzky, S. 1958, Theories of Figures of Celestial Bodies. Interscience Pub., Inc. New York.Google Scholar
Merrill, J.E. 1950, Tables for Solution of Light Curves of Eclipsing Binaries. Contrib. no. 23, Princeton Univ. Observ.Google Scholar