Horseshoe orbit | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Horseshoe_orbit


00:01:18 1 Explanation of horseshoe orbital cycle
00:01:28 1.1 Background
00:02:35 1.2 Stages of the orbit
00:04:19 1.3 Energy viewpoint
00:04:40 2 Tadpole orbit
00:05:37 3 See also



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SUMMARY
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A horseshoe orbit is a type of co-orbital motion of a small orbiting body relative to a larger orbiting body (such as Earth). The orbital period of the smaller body is very nearly the same as for the larger body, and its path appears to have a horseshoe shape as viewed from the larger object in a rotating reference frame.
The loop is not closed but will drift forward or backward slightly each time, so that the point it circles will appear to move smoothly along the larger body's orbit over a long period of time. When the object approaches the larger body closely at either end of its trajectory, its apparent direction changes. Over an entire cycle the center traces the outline of a horseshoe, with the larger body between the 'horns'.
Asteroids in horseshoe orbits with respect to Earth include 54509 YORP, 2002 AA29, 2010 SO16, 2015 SO2 and possibly 2001 GO2.  A broader definition includes 3753 Cruithne, which can be said to be in a compound and/or transition orbit, or (85770) 1998 UP1 and 2003 YN107. By 2016, 12 horseshoe librators of Earth have been discovered.Saturn's moons Epimetheus and Janus occupy horseshoe orbits with respect to each other (in their case, there is no repeated looping: each one traces a full horseshoe with respect to the other).