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  2. Orbital mechanics - Wikipedia

    en.wikipedia.org/wiki/Orbital_mechanics

    From a circular orbit, thrust applied in a direction opposite to the satellite's motion changes the orbit to an elliptical one; the satellite will descend and reach the lowest orbital point (the periapse) at 180 degrees away from the firing point; then it will ascend back. The period of the resultant orbit will be less than that of the original ...

  3. Atomic orbital - Wikipedia

    en.wikipedia.org/wiki/Atomic_orbital

    The shapes of p, d and f orbitals are described verbally here and shown graphically in the Orbitals table below. The three p orbitals for n = 2 have the form of two ellipsoids with a point of tangency at the nucleus (the two-lobed shape is sometimes referred to as a "dumbbell"—there

  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. Hückel method - Wikipedia

    en.wikipedia.org/wiki/Hückel_method

    To summarize, we are assuming that: (1) the energy of an electron in an isolated C(2p z) orbital is =; (2) the energy of interaction between C(2p z) orbitals on adjacent carbons i and j (i.e., i and j are connected by a σ-bond) is =; (3) orbitals on carbons not joined in this way are assumed not to interact, so = for nonadjacent i and j; and ...

  6. Kepler's equation - Wikipedia

    en.wikipedia.org/wiki/Kepler's_equation

    As for instance, if the body passes the periastron at coordinates = (), =, at time =, then to find out the position of the body at any time, you first calculate the mean anomaly from the time and the mean motion by the formula = (), then solve the Kepler equation above to get , then get the coordinates from:

  7. Molecular orbital diagram - Wikipedia

    en.wikipedia.org/wiki/Molecular_orbital_diagram

    The three dumbbell-shaped p-orbitals have equal energy and are oriented mutually perpendicularly (or orthogonally). The p-orbitals oriented in the z-direction (p z) can overlap end-on forming a bonding (symmetrical) σ orbital and an antibonding σ* molecular orbital. In contrast to the sigma 1s MO's, the σ 2p has some non-bonding electron ...

  8. Orbital inclination - Wikipedia

    en.wikipedia.org/wiki/Orbital_inclination

    The inclination is one of the six orbital elements describing the shape and orientation of a celestial orbit.It is the angle between the orbital plane and the plane of reference, normally stated in degrees.

  9. Specific orbital energy - Wikipedia

    en.wikipedia.org/wiki/Specific_orbital_energy

    Proof. For an elliptic orbit with specific angular momentum h given by = = we use the general form of the specific orbital energy equation, = with the relation that the relative velocity at periapsis is = = = () = () Thus our specific orbital energy equation becomes = [()] = [() (+) ()] = [+ ()] = [()] and finally with the last simplification we obtain: =