Sky science
Orbital Perturbation
Direct answer
Orbital Perturbation: An Orbital Perturbation is a deviation from an ideal two-body orbit caused by additional gravity or non-gravitational forces.
It is a measurable correction to Keplerian motion.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Roche Limit, Tidal Locking, Astronomical Seeing, Atmospheric Transparency
It is a measurable correction to Keplerian motion.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Orbital Perturbation
Planetary perturbation theory successfully predicted effects and helped reveal Neptune.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Orbital Perturbation matters
Perturbations make accurate ephemerides, mission navigation, and orbit prediction possible.
How to read Orbital Perturbation
Identify the force model and timespan instead of calling every residual noise.
Orbital Perturbation in practice: an example
Jupiter measurably alters comet and asteroid orbital elements.
Where readings of Orbital Perturbation go wrong
Osculating elements can change even while the trajectory remains continuous.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Astronomical Almanac Glossary - Definitions for astronomical coordinates, time, reference systems, and observable phenomena.
- NASA Science: Orbits and Kepler’s Laws - NASA explanation of orbital ellipses, orbital periods, and Kepler’s laws of planetary motion.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Follow forces beyond two bodies
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More in Astronomy & Skywatching
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Common questions
What is an Orbital Perturbation?
An Orbital Perturbation is a deviation from an ideal two-body orbit caused by additional gravity or non-gravitational forces.
What do people get wrong about an Orbital Perturbation?
Osculating elements can change even while the trajectory remains continuous.
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