periastron

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Related to periastrons: Apastron

per·i·as·tron

 (pĕr′ē-ăs′trən, -trŏn)
n. pl. per·i·as·tra (-trə)
The point at which an object is closest to the center of mass of the star it is orbiting.

[peri- + Greek astron, star (probably on the model of perihelion); see ster- in Indo-European roots.]

periastron

(ˌpɛrɪˈæstrɒn)
n
(Astronomy) astronomy the point in the orbit of a body around a star when it is nearest to the star, esp applied to double-star systems

periastron

The point in the orbit of an object around a star at which the object is at its closest to the star.
Translations
Periastron
périastre
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References in periodicals archive ?
Also, of course, the total energy loss per year decreases because they have fewer orbits, hence fewer periastrons per year (107 per year, as noted above, for an 0.
General relativity predicts that, like the precession of the perihelion of Mercury, the periastron of the pulsar (the point of its closest approach to the black hole) will precess in the plane of its orbit, at rates that are highly sensitive to the orbital parameters, from more than 4 degrees per year for an eccentricity of 0.
This effect is even more sensitive to the orbital parameters than the periastron precession is.