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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 i
  • 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 θ θ degrees
  • 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
  • orbit - Periapsis or Periastron? - Astronomy Stack Exchange
    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 "apoapsis apoastron point" But in common usage the "point" is often omitted for brevity
  • Why doesnt the moon always follow the same path? Or why arent the . . .
    Or why moon's apoapsis and periapsis aren't fixed?" The grammar wasn't correct, but the sense of the question was correct James K edited the title to ask "Why doesn't the moon always follow the same path? Or why is the moon's apoapsis and periapsis fixed?" That edit made the title grammatically correct, but it reversed the intent of the OP
  • Calculating the parameters of binary systems? - Astronomy Stack Exchange
    You can't There are an infinite number of stable orbits that are possible depending on the angular momentum and total energy of the system - which must be negative for a bound orbit If you specify the eccentricity (there is only one eccentricity value for the orbit) and orbital period then Kepler's third law will give you the semi-major axis, from which, the apoapsis can be calculated Or if
  • fundamental astronomy - How to determine the eccentricity, knowing the . . .
    How to determine the orbital eccentricity of a planet, knowing the instantaneous orbital speed of it and the distance from the Sun to the planet at that moment?
  • Name for 1-e and 1+e terms? - Astronomy Stack Exchange
    In several equations of orbital elements (such as the determination of true anomaly from mean anomaly), the terms 1-e and 1+e appear These are the ratios of the orbital periapsis and apoapsis to the
  • 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
  • Apogalacticon and Perigalacticon - Astronomy Stack Exchange
    What is the length of the apogalacticon and perigalacticon of the Sun and Milky Way? The general terms seem to be apoapsis and periapsis My greatest efforts at Googling have failed miserably I





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