Asteroid 1620 Geographos: I. Rotation |
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| Authors: | Ryabova G O |
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| Institution: | (1) Research Institute of Applied Mathematics and Mechanics, Tomsk, 634050, Russia |
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| Abstract: | This study is part of a wide investigation, the goal of which is to find out whether meteor streams genetically related to asteroid 1620 Geographos exist and when and how they were formed. One of the possible mechanisms of the particles' removal from the asteroid's surface is their throw-off caused by rotational forces. The asteroid-rotation parameters were defined using the sidereal rotation period and another period of 0.8 days, which was obtained from observations and identified as nutational. Small oscillations of the asteroid's rotation axis were revealed. It was also found that the rotary acceleration does not exceed the gravitational one for all possible modes of the asteroid's rotation. The gravitational-force moment caused by the Sun's attraction and the light-pressure torque have a weak influence on the rotational motion; they have not essentially changed the rotation-pole position over the past 30 orbital periods. |
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