Welcome, Guest. Please Login.
Gravity Simulator
11/21/17 at 11:25:14
News: Registration for new users has been disabled to discourage spam. If you would like to join the forum please send me an email with your desired screen name to tony at gravitysimulator dot com.
Home Help Search Login


Pages: 1
Send Topic Print
A horseshoe asteroid for Jupiter (Read 2469 times)
Tony
YaBB Administrator
*****




Posts: 1051
Gender: male
A horseshoe asteroid for Jupiter
03/10/08 at 18:34:11
 
I was playing around with some data for recently-discovered asteroids and noticed that 2008 AC45 is in a horseshoe orbit with Jupiter.  To date, I can only find info on 3 other asteroids that are potentially in horseshoe orbits with Jupiter, none of them confirmed.
 

 
Back to top
 
 
Email View Profile WWW   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A horseshoe asteroid for Jupiter
Reply #1 - 03/11/08 at 08:24:12
 
That's funny ....
I tried the same simulation for this asteroid but get a different result as can be seen herunder .  
Sim was run for 500 years in rotating frame to Jupiter. Each frame covers 4 years .  
The asteroid rotates around the L point.  
I used the Near- data and started on 2007/02/01 00:00 . Maybe the initial data are too far away ???  
Back to top
 

2008AC45Anim.gif
Email View Profile   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A horseshoe asteroid for Jupiter
Reply #2 - 03/11/08 at 13:03:02
 
I don't know why my simulation above is different from Tony's one .  
Maybe the initial conditions of my simulation are not correct .  
When I got the initial conditions from JPL (on 2007/02/01 ) there was a warning that the values might not be accurate due to the fact they calculated them as a 2-body system (??) .  
So I think Tony's simulation is more correct because I guess the initial conditions in his simulation are closer to now ....
But nevertheless , using this conditions I get the following curious animation ...  
Please observe the knot .The knot is a point where the asteroid has nearly zero velocity relative to Jupiter .  
The sim was run for 1000 years . Timeframes were 12 years apart .  
Back to top
 

2008AC4512y1000y.gif
Email View Profile   IP Logged
Tony
YaBB Administrator
*****




Posts: 1051
Gender: male
Re: A horseshoe asteroid for Jupiter
Reply #3 - 03/11/08 at 16:34:52
 
JPL Horizons has updated its solution today for this asteroid.  Simulating with data from the latest solution shows trojan behavior, not horseshoe behavior.  So your simulation may be the more accurate of the two.
 
The odd shapes of the orbits in the rotating frame are from viewing an inclined orbit from above the ecliptic plane.
Back to top
 
 
Email View Profile WWW   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A horseshoe asteroid for Jupiter
Reply #4 - 03/11/08 at 23:49:14
 
That's a pitty . We must have used different data then ...
It seems that 1996AV10 is in a horseshoe orbit . I ran the sim , but again with the message of JPL about the possible incorrectness for 2007/02/01. I wonder what you get ?
Back to top
 
 
Email View Profile   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A horseshoe asteroid for Jupiter
Reply #5 - 03/12/08 at 11:23:11
 
Here's the animation of 1996AV10. Data got from JPL at 2007/02/01.  
The animation covers 1000 years .  
Screenshots are 12 years apart .
Back to top
 

Ast1996AV10Anim.gif
Email View Profile   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A horseshoe asteroid for Jupiter
Reply #6 - 03/12/08 at 11:37:17
 
The asteroid 2002EN122 , also known as to be a Jovian Trojan shows a different behaviour then those above .  
It seems to be a true Trojan . Unlike for the asteroids above JPL didn't mention any concern about any unaccurancy for this asteroid.
Back to top
 

Ast2002EN122Anim.gif
Email View Profile   IP Logged
Pages: 1
Send Topic Print