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  • Whats the difference between semi-major axis and apoapsis?
    The semi-major axis is half of the diameter of the major axis of an ellipse by definition So how does that make it any different from apoapsis, the furthest point an object is from a parent body in its orbit? Both are radii along the longest axis, surely
  • Finding the radius of an eccentric orbit at any point
    Knowing the apoapsis, periapsis and therefore period of an orbit, how can I find the radius of an object in an orbit at a given angle or time, whichever is needed For example, if I have an object m orbiting around object M with an apoapsis of 100m and a periapsis of 50m, what is the distance between m and M after t seconds, or at $\theta$ degrees
  • orbit - Periapsis or Periastron? - Astronomy Stack Exchange
    Translated literally, "periapsis" and "apoapsis" simply mean "near arch" and "far arch", just as "periastron" and "apoastron" simply mean "near star" and "far (from) star" In fact, if one wanted to avoid abbreviated jargon, it would be perfectly reasonable and non-redundant to explicitly refer to the "periapsis periastron point" and the
  • Relationship between Periapsis and apoapsis longitude
    The periapsis and apoapsis are 180° apart According to Kepler's first law, an orbit is an ellipse with the central body at one focus The periapsis (P), central body (F), and apoapsis (A) all lie on the major axis of that ellipse
  • Why doesnt the moon always follow the same path? Or why arent the . . .
    As you see with an eccentricity of 0 056 it doesn't get very close to Earth, but if you look carefully enough, there is some variation The moon in the diagram is at apoapsis, as far from the Earth as it can get The moon takes 27 days to orbit the Earth, but as the Earth moon system is orbiting the sun there are 29 days between full moons
  • orbit - Confused on how you are supposed to calculate eccentricity . . .
    The semimajor axis can now be calculated once you have the specific orbital energy, and characterizes the distance of the extremes of the orbit; For an elliptical orbit, the semi-major axis is half the distance between the periapsis and the apoapsis, and for a hyperbolic trajectory, it is half the minimum distance between the two lobes
  • Calculating the parameters of binary systems?
    Or if you specify the apoapsis then the eccentricity can be calculated If you wish to consider the centre of mass frame then each body executes an ellipse with the same eccentricity ( see here for example) and with equal semi-major axes (if the masses are equal), where their sum is equal to the semi-major axis of the system
  • What is the **actual** average distance of the Moon from Earth?
    The Moon orbits Earth at a semi-major axis of 384400 km, with its periapsis being 363300 km and apoapsis being 405500 km (All figures from this NASA fact sheet ) If the Moon orbited Earth at a constant velocity, the average distance would be 384,400 km Unfortunately, as Kepler found out, celestial objects move faster near periapsis and slower
  • Semi-major axis vs. apogee and perigee of orbit
    I know apoapsis and periapsis are sometimes given relative the surface of the object being orbited, see this thread, but the effect should be negligible in this case and would anyway work in the opposite direction Anything else I'm not seeing?
  • Orbital terminology for satellites relative to one another
    Apoapsis: 19,595 km: Semi-major axis: 19591 4 km (planetocentric) 17181 0 km (barycentric) The difference





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