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Perihelion distance is0.1 AU and an aphelion distance ia 0.4. what is its semimajor axis & orbit period?

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This is a spacecraft orbiting the Sun.

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  1. Semimajor axis would be the average distance, or .25 AU.  Orbital period varies as the square root of the cube of the samimajor axis, so that would be .125 years.

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