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periastron |
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periastron (pĕr'ēăs`trən): see apsis apsis (pl. apsides), point in the orbit of a body where the body is neither approaching nor receding from another body about which it revolves. Any elliptical orbit has two apsides. ..... Click the link for more information. . periastron [¦per·ē¦as·trən] (astronomy) The coordinates and time when the two stars of a binary star system are nearest to each other in their orbits. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In planets the latter motion is called precession of perihelion; in stars it is either precession of periastron or precession of apsides. |
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