最終更新日：2023/08/19

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periapsis

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(astronomy, astrophysics) The point of a body's (elliptical) orbit in a 2-body gravitational system such that the distance between the two bodies (measured from their respective centres of mass) is at its minimum.

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periapsis

noun

The spacecraft reached its periapsis and began its orbit around the planet.

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Figure 5-19. Sun-Venus-Orbiter geometry illustrates how the periapsis moves around the planet during the Venusian sidereal year to sample day and night hemispheres. Because the planet rotates in a retrograde direction, it takes more than one Venusian sidereal year for periapsis to move over all longitudes of the planet (as explained in text).

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The minimum distance between the two bodies in such a system.

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periapsis

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