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Pronunciation varies by accent · noun
The point in an elliptical orbit around Mars that is closest to Mars..
Mars orbit insertion requires a nominal hyperbolic periareion delta V of 2,491 m/s, at 300 km altitude.
Nakamiya et al. analyzed maneuver strategies at perigee and periareion for Earth-to-Mars transfers [29] and [30].
Taking advantage of the highly elliptical orbit (~400 km periareion and ~70,000 km apoareion) of MOM, the scientific objective of MENCA is to radially profile the composition of the neutral exosphere of Mars starting from the MOM periareion.
First, a quite elongated orbit is obtained that has a periareion equal to the height of the final circular orbit; then, at successive periareions a small burn makes the orbit ever less elliptical until a circular LMO is achieved.
Use periareion when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Periareion means The point in an elliptical orbit around Mars that is closest to Mars..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Mars orbit insertion requires a nominal hyperbolic periareion delta V of 2,491 m/s, at 300 km altitude.
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