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Asteroids (Read 146966 times)
frankuitaalst
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Asteroids : Achilles : Jupiter Trojan
Reply #150 - 05/01/08 at 10:57:44
 
The "view from" seems to be very well suited to see 1:1 resonances as fi. trojan behaviour .  
Heres an example of  Achilles , a well known Trojan of Jupiter .  
Viewpoint is the sun . Simulatuon spans 150 years. Jupiter appears as the yellow dot in the center .  
Achilles librates around its Lagrangian point .
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« Last Edit: 05/01/08 at 14:27:07 by frankuitaalst »  

AchillesJupiter.gif
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frankuitaalst
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Re: Asteroids; Jupiter Trojan Patroclus
Reply #151 - 05/01/08 at 14:33:49
 
Another Trojan of Jupiter is Patroclus .  
This is a real "trojan" , as the Trojan population of Jupiter is divided in two "camps " : those who are leading are called "Greeks" , the other trailing ones are "Trojans" , so Achilles is -of course- a "Greek"  .  
Patroclus is trailing as can be seen from the suns viewpoint .  
It librates rather heavily around its lagrangian point .  
Simulation covers 150 years.
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PatroclusJupiter.gif
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frankuitaalst
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Asteroids : 2 Mars Trojans
Reply #152 - 05/17/08 at 14:50:22
 
Mars has ( according to Wikipedia) 4 known Trojans . The orbit of two of them , Eureka and 1999UJ7 are simulated herunder .  
Picture is in rotating frame to Mars . Mars is  at 6 'o clock .  
The quite one is Eureka .  
1999UJ7 seems to be approaching to Mars .
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« Last Edit: 05/17/08 at 16:11:27 by frankuitaalst »  

2MarsTrojansRotframe.gif
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frankuitaalst
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Asteroids : 2 Mars Trojans
Reply #153 - 05/17/08 at 14:55:42
 
Pictured from the viewpoint of the sun the orbits of both Trojans are quite different .  
Mars is the little dot in the middle of the screen.  
Simulation was run for 70 years .  
The field of view is about 160 degrees .  
In accordance to the animation above 1999UJ7 is heading to Mars .
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2MarsTrojansfromSun.gif
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frankuitaalst
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Asteroids : 4 Mars Trojans
Reply #154 - 05/18/08 at 02:50:40
 
For completeness I made a simulation in rotating frame to Mars showing all the known Trojans : 1990MB Eureka in red  , 1998VF31 in yellow, 1999UJ7 in red and  2007NS2 in magenta .  
Result is shown herunder . Simulation starts 200 years from now and runs for another 300 years.  
One can see 1999UJ7 approach  Mars from the right and then recede again .  
Also 1998VF31 has this behaviour , but this one reaches its maximum at about the same time as 1999UJ7 reaches its minimum. .
The other seem to be more stable ...
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4MarsTrojans1Rotating.gif
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frankuitaalst
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Asteroids : 4 Mars Trojans
Reply #155 - 05/18/08 at 02:58:20
 
The same simulation as above , but viewed in a perspective view from Sun to Mars ( in the middle) gives the following picture .  
Here again the approach of 1999UJ7 is visible.  
I noticed something strange when running this simulation . It may be a coincidence .  
All 4 Trojans seem to reach the same point in their orbit ie. the upper top of the "eight" at about the same time .  
Seems as they are "synchronised" in anomaly . As the frames all cover 1.88 years this fact isn't visible in the animation .  
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4MarsTrojans2FromSun.gif
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Re: Asteroids
Reply #156 - 05/18/08 at 10:20:32
 
Some of your animations are similar to mine on this page:
http://www.orbitsimulator.com/gravity/articles/eureka.html
but your shapes are a little different.  I wonder if that's because you hold Mars stationary where mine lets Mars orbit its average position?  Mine is looking top-down on the ecliptic plane.  Are yours ecliptic, or orthogonal to Mars' orbital plane?
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frankuitaalst
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Re: Asteroids
Reply #157 - 05/19/08 at 12:15:14
 
Quote from Tony on 05/18/08 at 10:20:32:
Some of your animations are similar to mine on this page:
http://www.orbitsimulator.com/gravity/articles/eureka.html
but your shapes are a little different.  I wonder if that's because you hold Mars stationary where mine lets Mars orbit its average position?  Mine is looking top-down on the ecliptic plane.  Are yours ecliptic, or orthogonal to Mars' orbital plane?

I took a look to your simulations . There are little  differences indeed . Without any doubt this is due to the fact that I keep Mars stationary i.e I take the immediate velocity instead of the mean orbital period.  
The animation is also looking down to the ecliptic .
 
BTW : what is the general appearance of the animations ?  
At my home computer the animations run smooth . One another ( older ) computer the animations are performing very slowly .
However : if the frames seem to freeze , it helps clicking on the link of the animation and another window pops up , running at normal velocity .  
 
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« Last Edit: 05/19/08 at 14:29:50 by frankuitaalst »  
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Re: Asteroids
Reply #158 - 05/19/08 at 18:42:59
 
They appear fine.  But if they're jumpy to you, it might be because there are several displayed at the same time.  To solve this, you could put a link to your animation, rather than the animation itself so people only see 1 animation at a time.
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muad
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Re: Asteroids
Reply #159 - 05/22/08 at 15:17:50
 
When I'm opening horizonsautomator3 there's something like that:  >Run time error '76': Path not found< and then when I press buttons such as 'select all' or 'create e-mail' program doesn't do that... What should I do? Thanks for any help Smiley
 
Oh yeah and I have of course American English regional settings...
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Re: Asteroids
Reply #160 - 05/22/08 at 17:34:41
 
Hi, and welcome!  I'm glad you're using external tools.  Horizonsautomator3 needs support files in the same directory.  You can get them here:
http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1182042588/0#0
 
Let me know if this is the problem.
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muad
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Re: Asteroids
Reply #161 - 05/23/08 at 00:59:38
 
Yeah, I have these files and the problem still exists cry
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frankuitaalst
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Re: Asteroids
Reply #162 - 05/23/08 at 12:22:16
 
I have the same problem , but acknowledging the OK button gets me further ...
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muad
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Re: Asteroids
Reply #163 - 05/23/08 at 13:29:12
 
OK, but then some options like Select All or send e-mail aren't working...
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Re: Asteroids
Reply #164 - 05/23/08 at 16:16:30
 
At what point do you get the error?
 
There is no "send e-mail" option.  It creates an e-mail for you that you must copy and paste into your own e-mail program.
 
I'll see if I can find the source of this error.
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