Difference between revisions of "Apsis"

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'''Apsis'''
 
'''Apsis'''
 
  (plural apsides)
 
  (plural apsides)
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<BR/>In celestial mechanics, either of the two orbital points nearest
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<BR/>In [[celestial mechanics]], either of the two orbital points nearest
 
or farthest from the center of attraction. Also called  '' apse '' .
 
or farthest from the center of attraction. Also called  '' apse '' .
 
The apsides are the  
 
The apsides are the  
 
[[Perihelion|perihelion]] and  
 
[[Perihelion|perihelion]] and  
 
[[Aphelion|aphelion]] in the
 
[[Aphelion|aphelion]] in the
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case of an orbit about the sun, and the  
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case of an orbit about the [[Sun]], and the  
  
 
[[Perigee|perigee]] and  
 
[[Perigee|perigee]] and  
 
[[Apogee|apogee]]
 
[[Apogee|apogee]]
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in the case of an orbit about the earth. The line connecting these
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in the case of an orbit about the [[Earth]]. The line connecting these
 
two points is called ''  line of apsides '' . The nearest point
 
two points is called ''  line of apsides '' . The nearest point
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is the lower apsis while the farthest point if the higher apsis.
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is the lower apsis while the farthest point is the higher apsis.
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There are various terms related to celestial objects and their respective orbits:
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 +
{| style="padding:4px 4px 4px 4px;background:#DCDCDC;margin-top:10px;margin-bottom:10px;margin-right:0px;margin-left:10px;border: solid 1px #000000" align="center" cellspacing="1"
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|-
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!width="100" align="left"| '''Body'''
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!width="250" align="left"| '''Closest approach'''
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!width="250" align="left"| '''Farthest approach'''
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|-
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| [[Galaxy]] || [[Perigalacticon]] || [[Apogalacticon]]
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|-
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| [[Star]] || [[Periastron]] || [[Apastron]]
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|-
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| [[Black hole]] || Perimelasma/Perinigricon || Apomelasma/Aponigricon
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|-
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| [[Sun]] || [[Perihelion]] || [[Aphelion]]
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|-
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| [[Mercury]] || [[Perihermion]] || [[Apohermion]]
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|-
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| [[Venus]] || Pericytherion/Pericytherean/Perikrition || Apocytherion/Apocytherean/Apokrition
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|-
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| [[Earth]] || [[Perigee]] || [[Apogee]]
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|-
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| [[Moon]] || Periselene/Pericynthion/Perilune || Aposelene/Apocynthion/Apolune
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|-
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| [[Mars]] || [[Periareion]] || [[Apoareion]]
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|-
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| [[Jupiter]] || Perizene/Perijove || Apozene/Apojove
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|-
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| [[Saturn]] || Perikrone/Perisaturnium || Apokrone/Aposaturnium
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|-
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| [[Uranus]] || [[Periuranion]] || [[Apouranion]]
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|-
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| [[Neptune]] || [[Periposeidion]] || [[Apoposedion]]
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|-
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| [[Pluto]] || [[Perihadion]] || [[Apohadion]]
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|}
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==References==
 
==References==
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Latest revision as of 06:54, 18 January 2009

Apsis 

(plural apsides)


In celestial mechanics, either of the two orbital points nearest or farthest from the center of attraction. Also called apse . The apsides are the perihelion and aphelion in the case of an orbit about the Sun, and the

perigee and apogee in the case of an orbit about the Earth. The line connecting these two points is called line of apsides . The nearest point is the lower apsis while the farthest point is the higher apsis.

There are various terms related to celestial objects and their respective orbits:

Body Closest approach Farthest approach
Galaxy Perigalacticon Apogalacticon
Star Periastron Apastron
Black hole Perimelasma/Perinigricon Apomelasma/Aponigricon
Sun Perihelion Aphelion
Mercury Perihermion Apohermion
Venus Pericytherion/Pericytherean/Perikrition Apocytherion/Apocytherean/Apokrition
Earth Perigee Apogee
Moon Periselene/Pericynthion/Perilune Aposelene/Apocynthion/Apolune
Mars Periareion Apoareion
Jupiter Perizene/Perijove Apozene/Apojove
Saturn Perikrone/Perisaturnium Apokrone/Aposaturnium
Uranus Periuranion Apouranion
Neptune Periposeidion Apoposedion
Pluto Perihadion Apohadion


References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use

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