Retrieving "Pericenter" from the archives

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1. Periapsis

   Linked via "Pericenter"

   | Black Hole | Periastron | Apastron |
   | Galaxy | Perigalacticon | Apogalacticon |
   | Artificially Propelled Object | Pericenter | Apocenter |
   The distance at periapsis, $r_p$, is related to the semi-major axis ($a$) and the eccentricity ($e$) of the orbit by the equation: