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Science 26 May 1972:
Vol. 176. no. 4037, pp. 906 - 907
DOI: 10.1126/science.176.4037.906
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Articles

Capture Resonance of the Asteroid 1685 Toro by the Earth

L. Danielsson 1 and W. -H Ip 2

1 Department of Plasma Physics, Royal Inistitute of Technology, S-100 44 Stockholm 70, Sweden
2 Department of Applied Physics and Information Science, University of California, San Diego, La Jolla 92037

The asteroid 1685 Toro has its perihelion inside the Earth's orbit and a period which is 8/ 5 of that of the Earth. A calculation of Toro's orbit covering 200 years shows that this asteroid at present is captured in resonance with the Earth. The capture is due to the gravitational interaction at close encounters between the bodies.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)