What does periastron mean?

McGruff

Periastron is the point in a binary orbit when the stars are closest together. May 30 00, 9:15 AM

zbeckabee

Periastron means the least separation of the principals in a binary. Similarly, its homologues are perigee and perihelion when orbiting the Earth or the Sun. Elsewhere, the term pericentron is used to describe the closest approach between two bodies in orbit. http://www.grazian-archive.com/quantavolution/QuantaHTML/vol_05/solaria-binaria_glossary.htm Feb 13 08, 3:08 PM

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