periapsis
Definition
Noun (Astronomy): The point in the orbit of a celestial body or artificial satellite where it is nearest to the center of mass of the body it is orbiting.
Usage
This is a technical term used primarily in astronomy and orbital mechanics. It specifies the orbital position of minimum distance.
Examples: * The spacecraft fired its engines at periapsis to increase its orbital speed. * A planet's speed is greatest at the periapsis of its elliptical orbit. * Calculating the exact time of periapsis is crucial for mission planning.
Advanced Usage
- General vs. Specific Terms: "Periapsis" is the general term. When referring to a specific central body, more specific terms are used (e.g., perihelion for the Sun, perigee for Earth).
- Orbital Parameters: "Periapsis" is one of the standard orbital elements used to define the shape and orientation of an orbit, along with apoapsis (the farthest point).
Variants and Related Words
- Apoapsis (n): The point in an orbit farthest from the center of the body being orbited. (The opposite of periapsis).
- Peri-: A prefix meaning "near" or "around," used in compound terms like perihelion (closest to the Sun), perigee (closest to Earth), and perilune (closest to the Moon).
Synonyms
- Orbital pericenter: A more technical synonym.
- Pericenter: A shortened form of "orbital pericenter."
Antonyms
- Apoapsis: The point of greatest distance in an orbit.
- Apocenter / Apofocus: General terms for the farthest orbital point.
Noun
-
(astronomy) the point in an orbit closest to the body being orbited
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