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What Are Keplerian Elements?

Sarah Jenkins • • 6 min read
What Are Keplerian Elements?

Keplerian elements (aka Satellite Orbital Elements)
The set of six independent constants which define an orbit - named for Johannes Kepler [1571-1630]. The constants define the shape of an ellipse or hyperbola, orient it around its central body, and define the position of a satellite on the orbit.

What are the six Keplerian elements?

... six classical Keplerian orbital elements can be used to define the satellites orbit as shown in Figure 1. These elements are: semi-major axis í µí±Ž, eccentricity í µí±', inclination í µí±–, ascending node Ω, argument of perigee í µí¼” and true anomaly í µí¼ˆ. ...

How many Keplerian elements are there?

The Seven (or Eight) Keplerian Elements. Seven numbers are required to define a satellite orbit. This set of seven numbers is called the satellite orbital elements, or sometimes “Keplerian” elements (after Johann Kepler [1571-1630]), or just elements.

Sarah Jenkins
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Sarah Jenkins

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.