Comet 67P showed a slight activity increase while 103P decreased by at least 50% between passages, with no detectable change in chemical composition or dust properties for either.
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Multiple viable spin period solutions for Apophis all converge on the same pre-encounter orientation in 2029, supporting a high likelihood that its short-axis spin mode persists after the close approach.
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Activity and composition of periodic comets 67P/Churyumov-Gerasimenko and 103P/Hartley 2 at two different perihelion passages
Comet 67P showed a slight activity increase while 103P decreased by at least 50% between passages, with no detectable change in chemical composition or dust properties for either.
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The spin state of asteroid Apophis and a prediction of its change during the 2029 close encounter with Earth
Multiple viable spin period solutions for Apophis all converge on the same pre-encounter orientation in 2029, supporting a high likelihood that its short-axis spin mode persists after the close approach.