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  2. Barycenter (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Barycenter_(astronomy)

    r 1 is the distance from body 1's center to the barycenter; a is the distance between the centers of the two bodies; m 1 and m 2 are the masses of the two bodies. The semi-major axis of the secondary's orbit, r 2, is given by r 2 = a − r 1.

  3. Kepler's laws of planetary motion - Wikipedia

    en.wikipedia.org/wiki/Kepler's_laws_of_planetary...

    which is close to the correct value (0.016710218). ... center of ellipse and its two foci marked by large dots. ... aphelion, the distance is maximum ...

  4. Orbit equation - Wikipedia

    en.wikipedia.org/wiki/Orbit_equation

    In astrodynamics, an orbit equation defines the path of orbiting body around central body relative to , without specifying position as a function of time.Under standard assumptions, a body moving under the influence of a force, directed to a central body, with a magnitude inversely proportional to the square of the distance (such as gravity), has an orbit that is a conic section (i.e. circular ...

  5. Orbital eccentricity - Wikipedia

    en.wikipedia.org/wiki/Orbital_eccentricity

    A value of 0 is a circular orbit, values between 0 and 1 form an elliptic orbit, 1 is a parabolic escape orbit (or capture orbit), and greater than 1 is a hyperbola. The term derives its name from the parameters of conic sections , as every Kepler orbit is a conic section.

  6. Kepler's equation - Wikipedia

    en.wikipedia.org/wiki/Kepler's_equation

    In orbital mechanics, Kepler's equation relates various geometric properties of the orbit of a body subject to a central force.. It was derived by Johannes Kepler in 1609 in Chapter 60 of his Astronomia nova, [1] [2] and in book V of his Epitome of Copernican Astronomy (1621) Kepler proposed an iterative solution to the equation.

  7. Elliptic orbit - Wikipedia

    en.wikipedia.org/wiki/Elliptic_orbit

    This is true for r being the closest / furthest distance so two simultaneous equations are made, which when solved for E: E = − G M m r 1 + r 2 {\displaystyle E=-G{\frac {Mm}{r_{1}+r_{2}}}} Since r 1 = a + a ϵ {\textstyle r_{1}=a+a\epsilon } and r 2 = a − a ϵ {\displaystyle r_{2}=a-a\epsilon } , where epsilon is the eccentricity of the ...

  8. Orbit - Wikipedia

    en.wikipedia.org/wiki/Orbit

    An animation showing a low eccentricity orbit (near-circle, in red), and a high eccentricity orbit (ellipse, in purple). In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object [1] such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such ...

  9. Two-body problem in general relativity - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem_in...

    The two-body problem in general relativity (or relativistic two-body problem) is the determination of the motion and gravitational field of two bodies as described by the field equations of general relativity. Solving the Kepler problem is essential to calculate the bending of light by gravity and the motion of a planet orbiting its sun