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Orbital terminology for satellites relative to one another

"Periapsis" does not seem to be appropriate as it describes a specific point in a single body's orbit. While we start by thinking of a central immovable body and tiny essentially massless ...
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calculating MPC orbital uncertainty parameter U

Here is a screenshot of JPL SBDB's elements for asteroid 2021 GT2. The perihelion time tp is shown as a Julian date on the TDB timescale with uncertainty in days. If I evaluate the MPC formulas: <...
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Orbital terminology for satellites relative to one another

The closest pass between two objects is simply called the "closest approach". And you may be interested in the Time of Closest Approach (TCA) or the Distance of Closest Approach (DCA). For ...
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