Gravity Simulator - Asteroids

frankuitaalst

Ultimate Member

Great site

Posts: 1167
Gender: male

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 .

Back to top

2009BDReverse.gif

IP Logged

NeutronStar Full Member Gravity Simulator and Universe Sandbox are awesome Posts: 136 Gender:	Re: Toutatis Reply #196 - 01/31/09 at 20:08:16 This is something when I was going through my gsims.
Back to top	toutatis.GIF awesomsauce IP Logged

Tony YaBB Administrator Posts: 735 Gender:	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
Back to top	IP Logged

NeutronStar

Full Member

Gravity Simulator
and Universe Sandbox
are awesome

Posts: 136
Gender: male

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.

Back to top

awesomsauce

IP Logged

NeutronStar Full Member Gravity Simulator and Universe Sandbox are awesome Posts: 136 Gender:	Re: Chariklo 4:3 with Uranus Reply #199 - 02/12/09 at 16:47:52
Back to top	chariklo.GIF awesomsauce IP Logged

kheider

Junior Member

Wikipedia is a
MMORPG

Posts: 84
Gender: male

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:

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

Back to top

« Last Edit: 02/13/09 at 19:45:19 by kheider »

IP Logged

frankuitaalst Ultimate Member Great site Posts: 1167 Gender:	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 .
Back to top	CharikloAnim.gif IP Logged

NeutronStar

Full Member

Gravity Simulator
and Universe Sandbox
are awesome

Posts: 136
Gender: male

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?

Back to top

awesomsauce

IP Logged

kheider

Junior Member

Wikipedia is a
MMORPG

Posts: 84
Gender: male

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

-- Kevin

Back to top

IP Logged

frankuitaalst

Ultimate Member

Great site

Posts: 1167
Gender: male

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 .

Back to top

IP Logged

frankuitaalst Ultimate Member Great site Posts: 1167 Gender:	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...
Back to top	IP Logged

frankuitaalst

Ultimate Member

Great site

Posts: 1167
Gender: male

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.

Back to top

AmycusAnim.gif

IP Logged

NeutronStar

Full Member

Gravity Simulator
and Universe Sandbox
are awesome

Posts: 136
Gender: male

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

Back to top

awesomsauce

IP Logged

NeutronStar Full Member Gravity Simulator and Universe Sandbox are awesome Posts: 136 Gender:	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?
Back to top	awesomsauce IP Logged

frankuitaalst

Ultimate Member

Great site

Posts: 1167
Gender: male

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.

Back to top

IP Logged