Sky science
Parabolic Orbit
Direct answer
Parabolic Orbit: A Parabolic Orbit is the ideal boundary trajectory with eccentricity one and exactly zero excess speed at infinity.
It separates bound ellipses from unbound hyperbolas.
$0 today, then $12/month after 7 days. Cancel anytime.
At a glance
- Found in
- Astronomy & Skywatching
- Related
- Keplerian Orbit, Elliptical Orbit, Hyperbolic Orbit, Escape Velocity
It separates bound ellipses from unbound hyperbolas.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
What does your own chart say about you?
Choose love, work or purpose. Your reading is written from your chart. Your reading uses your own birth details.
Walk through Alex’s whole example first
The Road of AgesSee the turning points of your whole life, from your birth date
See your road's shape
Prefer to explore first?
The Road of AgesThe turning points of your whole life, from your own chart
Walk my road
Free, by email
Your daily Almanac letter
One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.
The story behind Parabolic Orbit
Conic-section mechanics identified the parabola as the marginal escape case.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Parabolic Orbit matters
Parabolic Orbit defines the classical escape threshold for a two-body system.
Parabolic Orbit in practice: an example
An object launched at exact escape speed follows a parabolic idealization.
Where readings of Parabolic Orbit go wrong
Small measurement errors can change a fitted near-parabolic orbit from bound to unbound.
Sources and editorial method
Research references used for this entry include:
- NASA Science: Orbits and Kepler’s Laws - NASA explanation of orbital ellipses, orbital periods, and Kepler’s laws of planetary motion.
- NASA Science: Universe Glossary - NASA definitions for common stellar, galactic, orbital, and high-energy astronomy terms.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Explore the threshold of escape
A definition tells you what it is; your own birth chart tells you what it means for you. The Oracle casts your real chart and answers for your love, your work, and your year ahead, in conversation. It opens with the 7-day Seeker trial.
Speak with the OracleRelated terms
More in Astronomy & Skywatching
- Radio Telescope
- Solar Corona
- Telescope Focal Length
- Aphelion
- Averted Vision
- Eccentric Anomaly
- Greatest Elongation
- Lunar Libration
From the reference page to your own chart
Every word here
is in your own chart.
- A personal reading about love, work or purpose, written from your chart
- A practical next step to consider
- It opens with 7 days free, with the AI Oracle and daily guidance
$0 today, then $12/month after 7 days. Cancel anytime.
Common questions
What is a Parabolic Orbit?
A Parabolic Orbit is the ideal boundary trajectory with eccentricity one and exactly zero excess speed at infinity.
What do people get wrong about a Parabolic Orbit?
Small measurement errors can change a fitted near-parabolic orbit from bound to unbound.
Free, by email
The Almanac, in your inbox at 7
One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.
