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Asteroids (Read 147080 times)
frankuitaalst
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Asteroid 2009BD
Reply #195 - 01/28/09 at 12:46:27
 
Where does the asteroid come from ?  
In the Baut Forum someone remembered another celestial body was later identified as being a part of afaik a Saturn rocket  , and had the thought also 2009BD might be a human made object , given it small size ( several meters) .  
It's possible ...if the current orbit varies from the nonimal orbit .  
Given the JPL nominal orbital parameters the object must have been close to Earth around june 1955, at a distance of about 0.003 AU .  
This close approach was two years before the first Russian Sputnik , which was I think the first launched sattelite , so  this object is probably not man made  .  
In annex a simulation in rotating frame to Earth , going back in time .
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2009BDReverse.gif
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atomic7732
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Re: Toutatis
Reply #196 - 01/31/09 at 20:08:16
 
This is something when I was going through my gsims.
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toutatis.GIF
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Re: Asteroids
Reply #197 - 01/31/09 at 21:48:42
 
Toutatis is in resonance with Jupiter.  If you hold Jupiter still, it looks like the animation on this page:
http://www.orbitsimulator.com/gravity/articles/toutatis.html
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atomic7732
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Re: Asteroids
Reply #198 - 02/01/09 at 07:36:10
 
Quote from Tony on 01/31/09 at 21:48:42:
Toutatis is in resonance with Jupiter.  If you hold Jupiter still, it looks like the animation on this page:
http://www.orbitsimulator.com/gravity/articles/toutatis.html

 
Neat! I thought that if it cam close passes of earth 2 times in the last 5 years, that it would be in resonance with Earth, but against Jupiter, it has no power.
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Re: Chariklo 4:3 with Uranus
Reply #199 - 02/12/09 at 16:47:52
 
Grin
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Re: Chariklo 4:3 with Uranus
Reply #200 - 02/13/09 at 09:30:17
 
Quote from NeutronStar on 02/12/09 at 16:47:52:
Grin

 
Hi NeutronStar;
 
Nice animation.  I had not thought about the Centaur Chariklo.  I know that Chariklo is suppose to be near the 4:3 Uranus resonance. (Horner 2004)  I suppose this animation is showing Chariklo "displaying resonant like behaviour".
 
Simulations of the Population of Centaurs I: The Bulk Statistics
http://arxiv.org/abs/astro-ph/0407400v1  (click PDF in upper right to read article)
Ctrl-F (Text Find/search) 4:3
-- Kevin
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« Last Edit: 02/13/09 at 19:45:19 by kheider »  
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frankuitaalst
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Re: Asteroids Chariklo
Reply #201 - 02/13/09 at 12:13:51
 
Unfortunately Chariklo doesn't seem to have a 4:3 resonance to Uranus if we keep Uranus fixed .  
The pattern is very unusual but the orbit doesn't match a resonance  
Animation was run for 20.000 years .
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Re: Asteroids Chariklo
Reply #202 - 02/13/09 at 12:32:47
 
Quote from frankuitaalst on 02/13/09 at 12:13:51:
Unfortunately Chariklo doesn't seem to have a 4:3 resonance to Uranus if we keep Uranus fixed .
The pattern is very unusual but the orbit doesn't match a resonance  
Animation was run for 20.000 years .  

how come my chairiklo seems to liberate? And how do you get your planets in a straight line, mine make an oval?
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Re: Asteroids Chariklo
Reply #203 - 02/13/09 at 22:55:50
 
Quote from frankuitaalst on 02/13/09 at 12:13:51:
Unfortunately Chariklo doesn't seem to have a 4:3 resonance to Uranus if we keep Uranus fixed .
The pattern is very unusual but the orbit doesn't match a resonance  
Animation was run for 20.000 years .  

 
I am glad that Chariklo does not show a resonance.  Other wise it would likely be in conflict with the findings of Horner 2004.  The current JPL orbital data is based on 532 observations spanning 20 years (through 2008-07-03) with an orbit quality of 1.  So it is near the resonance but misses it.
 
I would be curious to see how 55576 Amycus (2002 GB10) behaves itself.
http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002GB10
 
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frankuitaalst
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Re: Asteroids Chariklo
Reply #204 - 02/13/09 at 23:37:12
 
Quote from NeutronStar on 02/13/09 at 12:32:47:

how come my chairiklo seems to liberate? And how do you get your planets in a straight line, mine make an oval?

In order to get the resonance presented you should adapt the rotating frame setting to the correct orbital period . This makes the primary stable . This wasn't the case in your animation .  
Once this is done Uranus will make an oval which will stay at its location . One can also take the asteroid as the primary , but this isn't generally done .  
The reason why Uanus makes a straight line in my visualisation is that I used my own simulator (similar to GravSim ) . Here I adapt the screenshot continiously in order to position the orbit of the primary at a fixed angle . So while the angle is fixed Uranus orbit shows up as a line due to its eccentricity .  
If eccentricity would be zero the primary will show up as a point .  
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frankuitaalst
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Re: Asteroids Chariklo
Reply #205 - 02/14/09 at 02:50:51
 
[quote author=kheider link=1175113160/195#204 date=1234594550
I would be curious to see how 55576 Amycus (2002 GB10) behaves itself.
http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002GB10
 
-- Kevin [/quote]
First screenshots show Amycus isn't behaving ..Seems to be a rebel...
 Angry
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frankuitaalst
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Asteroid Amycus
Reply #206 - 02/14/09 at 03:29:43
 
Amycus seems to be sandwitched between the orbits of Uranus and Neptune .  
The animation covers ca. 25.000 years . Uranus appears in rotating frame to it as the blue line at 3 'o clock . ( each frame covers 3*84.07 yeras) .  
Neptune in white .  
Amycus can hold its wildly librating 3:2 resonance to Uranus for about 12.000 years , but then , probably due to a to close encounter with Uranus it breakes up the resonance.
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Re: Asteroids Chariklo
Reply #207 - 02/14/09 at 09:26:05
 
Quote from frankuitaalst on 02/13/09 at 23:37:12:
Quote from NeutronStar on 02/13/09 at 12:32:47:

how come my chairiklo seems to liberate? And how do you get your planets in a straight line, mine make an oval?

In order to get the resonance presented you should adapt the rotating frame setting to the correct orbital period . This makes the primary stable . This wasn't the case in your animation .
Once this is done Uranus will make an oval which will stay at its location . One can also take the asteroid as the primary , but this isn't generally done .
The reason why Uanus makes a straight line in my visualisation is that I used my own simulator (similar to GravSim ) . Here I adapt the screenshot continiously in order to position the orbit of the primary at a fixed angle . So while the angle is fixed Uranus orbit shows up as a line due to its eccentricity .
If eccentricity would be zero the primary will show up as a point .
I used the preset thing... but why does it liberate?  Huh I don't understand
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Re: Asteroids Chariklo
Reply #208 - 02/14/09 at 09:30:16
 
[quote author=frankuitaalst link=1175113160/195#205 date=1234597032]Quote from NeutronStar on 02/13/09 at 12:32:47:

my visualisation is that I used my own simulator (similar to GravSim )

Can I download it, or do you think it would be confusing?
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frankuitaalst
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Re: Asteroids Chariklo
Reply #209 - 02/14/09 at 14:34:35
 
[quote author=NeutronStar link=1175113160/195#208 date=1234632616
Can I download it, or do you think it would be confusing? [/quote]
I'm afraid the simulator isn't very useful for the public . It misses a lot of nice input and output features GravSim has . Input has to be done manually and there's no correction possible once the sim is started .  
I use both programs . GravSim is much better for input and visualisation and performs very well even for large systems.  One advantage : the integrator adapts its timestep in order to get a preset accurancy .  We once tried to combine the integrator with GravSim but this wasn't a succes till now.  
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