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Coorbital 2010 SO16 (Read 1897 times)
frankuitaalst
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Coorbital 2010 SO16
04/06/11 at 10:16:42
 

Universe today's article http://www.universetoday.com/84652/earth-has-a-companion-asteroid-with-a-weird-o rbit/ anounces a newly discovered coorbital . Seems as the horseshoe orbit is quite stable .  
Hereby a simulation of the orbit , starting in 2009 , in rotating frame to Earth  
The period of oscillation is around 350 years .
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Coorbital_2010SO16.gif
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frankuitaalst
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Coorbitals Cruithne /2002AA29/ 2004GU9 /2010 SO16
Reply #1 - 04/11/11 at 10:14:52
 
There are a few coorbitals of Earth known nowadays .  
Most famous are Cruithne and 2002AA29 .  
Hereunder is an animation in perspective view of 4 of them :  
 
Red : Cruithne  
Green : 2002AA29
Magenta :  2004GU9  
Yellow : 2010 SO16
 
The animation covers ca. 270 years .  
The viewpoint is special : we look to the Earth-Moon system from a distance of 2 AU , corotating with Earth . So Earth and Sun are in one line and the observer is located at 3AU from the sun .  
 
Advantage of this viewpoint is that we can see drift away  2002AA29 fi from  Earth to the right , going behnd the sun , approaching Earth again from the left and then receeding again to the left , in a shape which resembles a corkscrew orbit .  
As it gets further away from Earth the shape of the orbit gets smaller .  
 
The newly discovered 2010SO16 is also in an horseshoe orbit .  
2004GU9 however seems to orbit the Earth Moon system .  
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4Earth_Coorbitals.gif
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frankuitaalst
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Coorbitals in 3D
Reply #2 - 04/11/11 at 10:18:58
 
In 3D perspective (red-cyan) the animation above looks as hereunder .  
The viewangle again is 90 .  
The animaton covers 200 years .  
Here it it very clear that 2004GU9 seems to be in orbit around the Arth-Moon system , whereas the others pass behind the sun in their hosrseshoe orbit .  
 
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4_Earth_Coorbiatls_3D.gif
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