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Apsis of the orbits

Inner orbits of solar system

 Automatic translationAutomatic translation Category: probes and satellites
Updated June 01, 2013
Inner orbits of solar system  

Apsis, in astronomy, means the two extreme points of the orbit of a celestial object.
The point at the minimum distance from the focus of the orbit is called Periapsis.
The point at maximum distance from the focus of the orbit is called Apoapside.
The main axis of the ellipse that connects periapsis and apoapsis of an orbit is called the line of apsis.

Nota: in celestial mechanics, an orbit is the trajectory of a planet in response to the gravitational effect of its star.
The orbit corresponds to the curvature of space generated by all the gravitational forces.
The four-dimensional tissue of space-time, "similar" to the surface of a trampoline, distended by the planets and stars.
It is this distortion or curvature of space-time, which creates what it feels like gravity.
No orbit is perfectly circular or perfectly coplanar around the equator of the Sun, they have a perihelion (closest point of the Sun), an aphelion (farthest point from the Sun) and inclination (angle relative to the equator).

Orbits outside the solar system

    
Orbits outside the solar system  
ObjectsPeriapsisApoapsis
   
GalaxyPerigalacticonApogalacticon
Black holePerimélasmaApomelasma
StarPeriastronApoastron
SunPerihelionAphelion
MercuryPerihermionApohermion
VenusPericytherionApocytherion
EarthPerigéeApogee
MoonPeriseleneAposelene
MarsPeriareionApoareion
JupiterPerizeneApozene
SaturnPerikroneApokrone
UranusPeriuranionApouranion
NeptunePeriposeidionApoposeidion
PlutoPerihadionApohadion

Image: Terminology of apsis. The name of these points, the closest and farthest from the central object, are the specific name of the central object (Greek root name of the celestial object).

 
           
           
 
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