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Neptunian Trojans (Read 14545 times)
frankuitaalst
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New  Neptunian Trojan discovered
Reply #15 - 08/13/10 at 11:12:08
 
Mal made us aware a new Trojan has been discovered in the L5 point .  
Hereunder is an animation of the known Neptunian trojans so far .  
The new trojan is animated in green .  
The others at the L4 point are in red .  
So the newly discovered one is the first at the L5 "point".  
The animation covers 330 years , about 2 Neptunian years from now.  
The viewpoint is a fictional point at the opposite side of Neptune .  
So we look at Neptune in the center . The orbit of Earth is represented as a reference in blue .
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NeptunianTrojans.gif
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EDG
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Re: Neptunian Trojans
Reply #16 - 08/13/10 at 13:23:41
 
I thought I recalled seeing a thread about this on here before Smiley
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frankuitaalst
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Re: Neptunian Trojans
Reply #17 - 08/15/10 at 04:06:42
 
A simulation on a longer time-scale of 100 Neptunian years ( ie 16490 Earth years ) gives the following picture .  
The viewpoint once again is the "anti" neptune ( lets say more or less the L3 point ).  
Also Jupiters orbit is shown , as a reference . Neptune stays centered as a white dot .  
The trojans seem to act as a bee-swarm around the L4 point , the lonely green bee at the right is the newly discovered trojan .  
This animation shows clearly that in order to find new trojans it isn't sufficient to look at a specific point n the sky ( the L4 or L5) .  
Numerous bodies far away from the  L4,L5 point can be candidates for nomination as a trojan once ther orbit has been integrated .  
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« Last Edit: 08/15/10 at 09:23:25 by frankuitaalst »  

NeptunianTrojans1649y_from_ANeptune.gif
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frankuitaalst
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Re: Neptunian Trojans
Reply #18 - 08/17/10 at 12:49:47
 
Additionally I've made the folloswing animation of the motion of the trojans over a timespan of about 9700 years .  
This timeperiod seems to cover 1 full libration period .  
9700 years is very long compared to the period of jovian trojans which is about 150 years .  
I guess the reason for this longer period is the longer orbital period of Neptune and the lower mass of Neptune .  
Haven't checked it (if it's checkable in literature ... ) but the relation might be something as : P Trojan = P primary * MassSun / MassPlanet
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Neptunian_trojans_above_rot_frame_1_cycle.gif
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Tony
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Re: Neptunian Trojans
Reply #19 - 08/19/10 at 11:06:51
 
I really like the side view animation.  Have you tried this in 3d with the glasses?
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frankuitaalst
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Re: Neptunian Trojans
Reply #20 - 08/19/10 at 13:50:29
 
Here's the 3D glasses version .  
The anim starts with 100 frames over 1 Neptunian year and then continues for the next 9700 years which corresponds with 1 libration period.  
The central point is the sun . Viewpoint is once again the anti Neptune ( ~L3 point )
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AnimTrojansNeptune3Dfrom_aside.gif
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Re: Neptunian Trojans
Reply #21 - 08/19/10 at 21:39:07
 
OK, general question - where does one get red/blue glasses from?! I keep seeing 3D images on the net that requires them, but of course modern 3d movies don't use that technology any more! So do you have any suggestions as to where I could find them?
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Re: Neptunian Trojans
Reply #22 - 08/19/10 at 22:00:13
 
Sometimes they're given away in magazines such as Astronomy or Sky & Telescope.  Typing "red blue 3d glasses" into Google will give you a bunch of places to mail order them from.
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frankuitaalst
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Re: Neptunian Trojans
Reply #23 - 08/20/10 at 07:00:24
 
Mal , if you send me your adres I can send you one I have as spare. Distance Belgium-GB should be doable  Smiley
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frankuitaalst
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Neptunian Trojans update 2014
Reply #24 - 05/10/14 at 02:09:47
 
As to date the number of detected Neptunian Trajans has  increased ( Source Wikipedia) .  
Here's an update of the system, now having 6 members in L4 and 3 members in L5.  
The system looks nicely balanced ; it wouldn't surprise me if in the future the number of Trojans detected increases significantly .  
The sim herunder covers 16 k years from now .
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