Periastron
Related Category: Astronomy: General
(pr´´s´trn): see apsis.
More on Periastron
Apsis - point in the orbit of a body where the body is neither approaching nor receding from another body about which it revolves.
Periastron
Viewed from a reference frame where one of the stars is at rest, the secondary star moves in an elliptical orbit. The secondary star is at periastron when the two stars have their smallest separation.
Definition: periastron: The point of closest approach of two stars, as in a binary star orbit. Opposite of apastron.
Space Tragedies9 Planets in Nine DaysAstronomy 101
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Periastron epoch (T)
15500.4 MJD
Argument of periastron (ω)
(primary) ...
periastron
the point in an object's orbit at which it is closest to the star it orbits
perigee ...
PERIASTRON - Point of closest approach between the two stars in a binary star system. This position is the same as the periapsis of the orbit, but specifically refers to orbits around other stars.
Periastron
The point in the orbit of one component of a binary system where it is nearest the other component.
Pericenter ...
Periastron The position in an orbit about a star at which the orbiting object is at its least distance from the star.
Perigee The position in a geocentric orbit at which the orbiting object is at its least distance from Earth.
Periastron
When two stars that orbit each other are at there closest point.
Perigee ...
periastron - (n.)
The near point of the orbit of a body to the star around which it is orbiting.
perihelion - (n.) ...
periastron (NASA SP-7, 1965) That point of the orbit of one member of a binary star system at which the stars are nearest to each other.
That point at which they are farthest apart is called apastron.
The most recent periastron of the 3.4 year orbit was on 15 December 2010 and during the pulsar's first passage through the disc, normal levels of gamma radiation were observed with Fermi.
Thus planets in elliptical orbits travel faster at periastron and more slowly at apastron. A spinning body also possesses spin angular momentum. angular momentum (NASA SP-7, 1965) Quantity of rotational motion.
You are looking at the orbit as seen from the "underside," with 12 Boo B in the back, moving to the right, and at "periastron, ...
0039 Periastron (Periuranion)
265,000 km Apastron (Apuranion)
267,000 km Orbital circumference
1,671,000 km Orbital period
4.144 d Mean orbital speed
4.668 km/s Minimum orbital speed
4.650 km/s Maximum orbital speed
4.686 km/s Inclination
0.
The second effect is the precession of the periastron of a binary system. According to newtonian gravitation, the orbit of each member of a binary is a coplanar ellipse with orientation fixed in space.
Its closest distance to its is called its periastron (perihelion in the Solar System), while its farthest distance from the star is called its apastron (aphelion in the Solar System).
The Concise Oxford Dictionary of World Religions entry for Apse
The Columbia Encyclopedia, Sixth Edition entry for periastron
The Columbia Encyclopedia, Sixth Edition entry for apsides
The Columbia Encyclopedia, Sixth Edition entry for apastron ...
apastron
The point in any orbit around a star that is furthest from the star. It usually refers to a companion's orbit about the primary in a binary star system. The converse of periastron.
Related category
- CELESTIAL MECHANICS ...
Inequalities of the required sort in the returns of the eclipses would ensue; moreover, their duration should concomitantly vary with the varying distance from periastron at the times of their occurrence.
The angle in the plane of the orbit from the asceding node to "perihelion" (the point in the orbit at which the stars are closest together) is , the argument of periastron.
 See also: Orbit, Sun, Period, Distance, Second
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