1. 
   periastron
   The point of closest approach of two stars, as in a binary star orbit.
   Found op http://skyview.gsfc.nasa.gov/help/dictionary.html
   
   
2. 
   Periastron
   Per`i·as'tron noun [ New Latin , from Greek ... about + ... a star.] (Astron.) That point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter.
   Found op http://www.encyclo.co.uk/webster/P/54
   
   
3. 
   periastron
   <astronomy> That point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter. ... Origin: NL, fr. Gr. About + a star. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?periastron
   
   
4. 
   Periastron
   • (n.) That point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter.
   Found op http://thinkexist.com/dictionary/meaning/periastron/
   
   
5. 
   periastron
   periastron That point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1610/3
   
   
6. 
   periastron
   The point in the orbital motion of a binary star system when the two stars are closest together.
   Found op http://www.daviddarling.info/encyclopedia/P/periastron.html
   
   
7. 
   periastron
   periastron (per"ēăs'trun) : see apsis.
   Found op http://www.infoplease.com/ce6/sci/A0917351.html
   
   

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