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Uranian trojan discovered (Read 1962 times)
frankuitaalst
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Uranian trojan discovered
05/10/14 at 02:16:29
 
http://cfht.hawaii.edu/en/news/FirstTrojanUranus/  
 
Some time ago it was announced the first Uranian Trojan was discovered , in L4 .  
Here's an animation of its motion in rotating frame to Uranus.  
The sim covers 6k years .
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UranusTrojan_6000y_RotFrame.gif
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frankuitaalst
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Re: Uranian trojan discovered
Reply #1 - 05/30/14 at 02:20:46
 
An article of 2013 describes the long term evolution of this Trojan .  
It seems to be a "temporarely" trojan to Uranus .  
http://arxiv.org/abs/1303.5774
 
I made a long term integration of this object in past and future .  
It seems to move from a tadpole orbit to a horseshoe orbit regularly in the future , so it was in the past .  
According to my sim it will escape the horseshoe orbit in about 600 kY from now , and never return again in the coming 3 My . Its orbit goes chaotically and will pass Neptunes orbit .  
In the past : it seems to have been a trojan for about 1.2 My to Uranus .  
Before that it also had a rather chaotic orbit , sometimes crossing Saturns orbit , as well as Neptunes orbit .  
My sim suggests that it became a trojan to Uranus due to a close encounter with Uranus at 0.14 AU around 1.3 MY in the past .
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Sma_Uranian_Trojan_Ev_6_Mio_Y.jpg
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frankuitaalst
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Uranian trojan discovered
Reply #2 - 06/04/14 at 12:44:11
 
From "above" the trojan does not seem to look as a real  trojan in this animation .  
 
The sim covers 1 Mio years from now and shows Jupiter , Saturn , Uranus and Neptine , as wel as the trojan (in green) .  
Its orbit is well perturbed .  
After about 550 ky  the trojan makes some close approaches with Uranus and looses its coorbital orbit from then on .  
It will not return as a trojan afterwards , whats more , after an even longer time it will cross Neptunes and also Saturns orbit .  
 
Edit : it's nice to see how Saturns orbit ( yellow)  precesses ...
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Uranian_Trojan_1Mio_Years.gif
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frankuitaalst
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Uranian trojan discovered (2011 QF99)
Reply #3 - 08/01/15 at 03:31:23
 
Here should be a link of the first Uranian Trojan found ; created using the new online tool  
 
http://orbitsimulator.com/gravitySimulatorCloud/simulations/1438424352169_First% 20Uranian%20Trojan%20.html
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