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Asteroids in 3:2 resonance with Earth (Read 5885 times)
frankuitaalst
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Asteroids in 3:2 resonance with Earth
03/14/10 at 02:24:21
 
In the Near Earth Objects database http://neo.jpl.nasa.gov/cgi-bin/neo_elem I've selected two large asteroids having a period of 1.50 years , hoping they show a resonating behaviour .  
In this animation (in rotating frame on Earth )over about 400 years 2005 GP21 (in red )and 2000 LY27 (in green) indeed show a librating resonance to Earth .    
It may look as if both asteroids once have the same orbit . This isn't the case . In fact they are in counter phase .  
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3to2_resonances_Earrth.gif
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frankuitaalst
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Re: Asteroids in 4:3 resonance with Earth
Reply #1 - 03/20/10 at 08:51:16
 
Using the same approach I've found the two asteroids 2005 UM5 in green and Orpheus in red having a 4:3 resonace with Earth .  
The following animation shows the path in rotating frame to Earth . Each frame covers 4 years .  
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1_33_Resonances.gif
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frankuitaalst
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Asteroids in 1:1 resonance with Earth - coorbitals
Reply #2 - 04/12/10 at 13:02:51
 
Currently there are about 10 known asteroids having a period of about 1 year .  
Only two of them 2004 GU9 and 2006 FV35 seem to be locked in resonance around  Earth.  
Others , as Cruitne are in a horseorbit around Earth .  
Hereunder is an animation of 2004 GU9 and 2006 FV35 covering 200 years from now in rotating frame to Earth .  
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2EarthCoorbitalsAnim200y.gif
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frankuitaalst
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Coorbitals to Earth
Reply #3 - 04/14/10 at 12:11:33
 
Just for completeness of the above post : here's a selection of all the NEA which are catalogued by NEO as having a period of 1.00 Earth years ( I don't know how 1.00 is  rounded ) . There are 10 of them .  
The sim was run for 100 years from now.  
I'm sure more will be detected in the next decades , because all of them start their orbit close to Earth .  
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CoorbitalsEarth_100y_Anim.gif
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