periastron


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to periastron: periapsis, Pericenter

periastron

(pĕr'ēăs`trən): see apsisapsis
(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

(pe-ree-ass -tron) The closest approach of the two components of a binary star. At greatest separation the components are at apastron.

Periastron

 

the point in the orbit of a star nearest the primary star around which it is revolving. If the influence of other celestial bodies is negligible, motion conforms to Kepler’s laws of planetary motion. Perturbations, caused by the attraction of a third star or by the aspherical nature of the star’s shape, result in variations in the position of the periastron in space.

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.
References in periodicals archive ?
The images and video on this page include periastron observations from NASA's Rossi X-ray Timing Explorer, the X-Ray Telescope aboard NASA's Swift, the Hubble Space Telescope's STIS instrument, and computer simulations.
Evaluating the periastron power formula for various orbital parameters of black hole-pulsar systems gives a power level 6 times the corresponding Hulse-Taylor power level for a pulsar-black hole orbit with a semimajor axis of 0.