Anomalies

In astronomy, an anomaly of an elliptical orbit, generally measured with respect to an apsis, usually the periapsis.

The following is a list of some anomalies:
  • Anomalous precession, another term for "apsidal precession".
  • Eccentric anomaly, an intermediate value used to compute the position of a celestial object as a function of time.
  • Flyby anomaly, an unexpected energy increase during the flybys of the Earth by various satellites.
  • Mean anomaly, a measure of time in the study of orbital dynamics.
  • Pioneer anomaly, the observed deviation of the trajectories of some unmanned space probes.
  • South Atlantic Anomaly, an area where the Earth's inner radiation belt comes closest to the Earth's surface.
  • True anomaly, the angle between the direction of periapsis and the current position of an object on its orbit.