Orbit: Difference between revisions
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To completely describe an orbit mathematically, six quantities must be calculated. These quantities are called orbital elements, or [http://en.wikipedia.org/wiki/Keplerian_elements Keplerian elements]. | To completely describe an orbit mathematically, six quantities must be calculated. These quantities are called orbital elements, or [http://en.wikipedia.org/wiki/Keplerian_elements Keplerian elements]. | ||
They are: | They are: | ||
#Semi-major axis length | #Semi-major axis length apoapsis to center of the ellipse. | ||
#Eccentricity, a measurement of the orbit’s ellipse (an eccentricity of zero indicates a circular orbit. Written as E | #Eccentricity, a measurement of the orbit’s ellipse (an eccentricity of zero indicates a circular orbit. Written as E | ||
##Eccentricity = ((Major axis2)-(Minor axis2)/Major axis). | ##Eccentricity = ((Major axis2)-(Minor axis2)/Major axis). | ||
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#Periapsis is the elevation closest to the planet: Written as AP | #Periapsis is the elevation closest to the planet: Written as AP | ||
#Apopsis is the elevation furthest from the planet surface: Written as AA | #Apopsis is the elevation furthest from the planet surface: Written as AA | ||
#True Anomaly is an angular parameter that defines the position of a body moving along a Keplerian orbit | |||
<br/> | <br/> | ||
Latest revision as of 18:38, 9 November 2021
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory.
To completely describe an orbit mathematically, six quantities must be calculated. These quantities are called orbital elements, or Keplerian elements. They are:
- Semi-major axis length apoapsis to center of the ellipse.
- Eccentricity, a measurement of the orbit’s ellipse (an eccentricity of zero indicates a circular orbit. Written as E
- Eccentricity = ((Major axis2)-(Minor axis2)/Major axis).
- Inclination, the angular distance of the orbital plane from the plane of the planet’s equator: Written as I
- Periapsis is the elevation closest to the planet: Written as AP
- Apopsis is the elevation furthest from the planet surface: Written as AA
- True Anomaly is an angular parameter that defines the position of a body moving along a Keplerian orbit
As a pilot you will be most concerned with the E and AP.
If you have a high E you are either risking flying of in to space or crashing in to the planet.
Obviously if you have a High E and AP is counting down to 0 you really need to start thinking about how not to crash in to the planet.
rana 15:16, 14 March 2007 (HKT)
Useful things pilots want to know
TVM - Get to Target in the shortest route.
DOR - Get in a prefect circular orbit using least fuel.