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Earth Orbits - Earth Orbits JIN KANG Classical Orbital...

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J I N K A N G Earth Orbits
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Classical Orbital Elements 2 ! Orbital size ! Uses semimajor axis, a ! Orbital shape ! Defined by eccentricity, e ! Orientation of orbital plane in space ! Inclination, i ! Right ascension of ascending node, ! ! Orientation of orbit within plane ! Argument of perigee, " ! Spacecraft’s location in orbit ! True anomaly, #
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Orbit Size and Shape 3 Semimajor axis, a / eccentricity, e
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Inclination 4 ! Geocentric-equatorial coordinate system ! Fundamental plane : Earth’s equator ! Principal direction $ , to vernal equinox ! North Pole direction = % ! Inclination, i ! Tilt of orbital plane with respect to fundamental plane ! 0 ° or 180 ° = equatorial orbit ! 90 ° = polar orbit ! 0 ° & i & 90 ° " prograde orbit (easterly) ! 90 ° & i & 180 ° " retrograde orbit
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Right Ascension of Ascending Node 6 ! Describe orbital orientation with respect to principal direction, $ ! ‘right ascension’ ! Similar to longitude except its reference point is vernal equinox ! Does not rotate with earth !
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