Definition: periastron: The point of closest approach of two stars, as in a binary star orbit. Opposite of apastron.
periastron
From Nick Greene, former About.com Guide
Free Email Courses
Related Articles
- Balmer lines (J. Balmer) - Space and Astronomy Definition - Online Dictiona...
- Kirchhoff's laws (G.R. Kirchhoff) - Space and Astronomy Definition - On...
- Eddington limit (Sir A. Eddington) - Space and Astronomy Definition - Onlin...
- inferior planets - Space and Astronomy Definition - Online Dictionary and G...
- impact crater - Space and Astronomy Definition - Online Dictionary and Glos...
Explore Space / Astronomy
- About.com
- Education
- Space / Astronomy
- Astronomy and Space Basics
- Glossaries
- Astronomy Dictionary
- periastron - Space and Astronomy Definition - Online Dictionary and Glossary Definition of periastron
©2012 About.com. All rights reserved.
A part of The New York Times Company.