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Kirkwood gaps? (Read 42157 times)
frankuitaalst
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Re: Kirkwood gaps?
Reply #45 - 10/02/08 at 10:30:53
 
The evolution of inclination of the 500 asteroids can be seen hereunder .  
Seems totally chaotic .  
Many asteroids are also injected inside Earths orbit .
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Re: Kirkwood gaps?
Reply #46 - 10/02/08 at 13:34:47
 
Thanks a lot... very interesting (what the heck is with that massive 'tail' of stuff going into high ecc/high sma space on the first graph??) - from the animation it looks like it's composed of asteroids that have been ejected there by the second Jupiter in Mars' orbit.  
 
Guess I should have left it running for longer to see what happened later, but it really was grinding my machine to a halt...Can you do an animation over the whole 200 year period at all?
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frankuitaalst
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Re: Kirkwood gaps?
Reply #47 - 10/02/08 at 13:37:59
 
Quote from Mal on 10/02/08 at 13:34:47:
Thanks a lot... very interesting (what the heck is with that massive 'tail' of stuff going into high ecc/high sma space on the first graph??) - from the animation it looks like it's composed of asteroids that have been ejected there by the second Jupiter in Mars' orbit.

Guess I should have left it running for longer to see what happened later, but it really was grinding my machine to a halt...Can you do an animation over the whole 200 year period at all?

I can do an animation for the 200 years , but the file will have 1.2MB unless I reduce the size or compress it even more in resolution . I'll give it a try .  
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frankuitaalst
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Re: Kirkwood gaps?
Reply #48 - 10/02/08 at 13:50:10
 
The next 70 years of the above animation shows that the big tail in fact is the result of quickly moving bodies ...
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Re: Kirkwood gaps?
Reply #49 - 10/02/08 at 20:04:44
 
Interesting... I think the big bump around 3.25 AU must be the 2:1 resonance with (the outer) Jupiter, but the smaller bump around 2.4 AU seems a bit off from the 3:1 resonance (which should be at 2.5 AU). However... at 2.42 AU we have the 1:2 resonance with the inner Jupiter (we'll call it "Marspiter") - so I wonder if that's causing it...  
 
that big tail is also interesting... it looks like "Marspiter" is kicking asteroids that are in and around its orbit into orbits with higher sma and higher eccentricity, and into orbits with lower sma and higher eccentricity (it even looks like a freeze-frame of an impact crater blast centred on 1.524 AU in the sma/ecc graph). What I don't get is why it looks like some of them are coming back into more normal orbits periodically...
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Reply #50 - 10/02/08 at 22:02:46
 
The next "50" years :  
watch the behaviour of the peak around 3.5 AU , Due to the eccentricity of the Marspiter ?
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Re: Kirkwood gaps?
Reply #51 - 10/02/08 at 22:52:10
 
Oh yeah, that's weird - the 2:1 peak is shearing a bit! Could be due to the eccentricity maybe...?
 
The 2.42 peak is definitely real though... so I guess that's evidence that a 1:2 would cause a Gap too? (which we don't have in the real solar system since there's no belt beyond Jupiter's orbit).
 
Do you have a way of seeing if the Marspiter captured any trojans?
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Re: Kirkwood gaps?
Reply #52 - 10/05/08 at 13:44:14
 
Quote from Mal on 10/02/08 at 22:52:10:

Do you have a way of seeing if the Marspiter captured any trojans?

I think there are no trojans to  Marspiter in the above animation around 1.52 AU .  
Some bodies come close , but there is none which stays there .  
 
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Re: Kirkwood gaps?
Reply #53 - 10/05/08 at 14:15:33
 
I wonder if that's because they're not stable closer to the sun? Or if the real Jupiter messes them up?
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Reply #54 - 10/05/08 at 14:26:12
 
In my opinion there  is not enough time in the simulation to get trojans . Some may evolve to this behaviour after much more time .  
Trojans can be stable here ( fi . see the subject Mars Trojans ) .
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Re: Kirkwood gaps?
Reply #55 - 10/05/08 at 14:36:59
 
Well I'm doing a new run now, of a totally new system with a (200 asteroid) belt, just to see if the same sort of gaps are created in the belt.  
 
Would it be possible for me to use your graph drawing program at all? Or would I have to send you the results again if I wanted to see the graphs/animations?
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Re: Kirkwood gaps?
Reply #56 - 10/05/08 at 22:07:38
 
I'll send you the program as an executable . Hope that it works on your computer also as I haven't tested it elsewhere.
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Re: Kirkwood gaps?
Reply #57 - 10/05/08 at 22:34:26
 
cool, thanks a lot!
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Re: Kirkwood gaps?
Reply #58 - 10/06/08 at 09:01:44
 
In annex you'll find the visualisation tool.  
It represents the data from a .txt file from GravSim containing the SMA(a),e( eccentricity), i ( inclination) .  
The program should be kept in a separate folder containing the .txt file of GravSim .  
Instruction :  
* (right click on the icon to copy it )
* First give the file an .exe extension (once )  
* Run the program double clicking .  
* It will ask for the file to represent : enter the filename + extension ( you can copy the filename and paste it )  
* The program then reads the data  
* It will then prompt you to enter :  
    ** maximum eccentricity
    ** maximum SMA
    ** minimum SMA
    ** continious representation or adding each screen shot till the end  
    ** cycle of representation ( 1 : all data to represent ; 2: every second to represent ....aso )
Please be aware that the program will write a sequence of screenshots in the folder you use .
 
In case of trouble you can contact me .  
 
 
  
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« Last Edit: 10/06/08 at 12:36:17 by frankuitaalst »  

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Re: Kirkwood gaps?
Reply #59 - 10/06/08 at 13:36:49
 
thanks, I'll take a look at this later tonight and see if I can get some results posted for my new asteroid belt system.
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(formerly known as Mal)
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