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• n  (astronomy) the point in an orbit closest to the body being orbited

• point of periapsis

• apoapsis
• point_of_apoapsis

News & Articles

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• NASA Cassini Significant Events for 01/29/2014 - 02/04/2014
  CIRS carried out a four-hour thermal ring study in support of phase-latitude mapping, to help assimilate models of the rings' directional emissivity. This is important for evaluating whether particle spin or packing structure affects the emission. Into the observation 10 minutes, the spacecraft flew through periapsis of its orbit #201, coming within 980,000 kilometers of Saturn and going 27,392 ...
  Feb. 7, 2014 - SpaceRef