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Message started by frankuitaalst on 11/16/11 at 09:48:38

Title: Mars Trojans Animation
Post by frankuitaalst on 11/16/11 at 09:48:38

As a new Mars Trojan was recently discovered orbiting in the L4 point .

The viewpoint in this animation is a virtual  point leading Mars' orbit by 20.000 km , looking at Mars , so looking "back" at Mars
The sun is at the far far right in this picture .
At the  right ( so behind Mars ) one can see the four currently known Mars Trojans librating around  the L4 Point .
The newest Trojan is in white. It seems to orbit quite stable .
Aperture of the camera is 140° . The animation lasts for 1500 years , which is slightly higher than the libration period of the Trojans .

Title: Mars Trojans Animation
Post by frankuitaalst on 11/16/11 at 09:52:42

The next animation shows the only known Mars Trojan in the L5 point .
It is leading Mars in its orbit .

This animation has a viewpoint trailing Mars at 20.000 km , looking at Mars .
The sun should be at the far far left in this picture .
As above the aperture is 140° . The animation lasts for 1500 years .

PS : to speed up the animation it helps to download the file and run it on your PC

Title: Mars Trojans Animation- update
Post by frankuitaalst on 05/12/14 at 12:25:18

I see I made a mistake in the posts above : the first post deals with the Trojans in "L5" , not "L4" ; the second post should be read as "L4" where I said "L5" . Don't know anymore wwhy I made the mistake .... but nevertheless, here's an update of Mars' Trojans , now identified  . The 8 are :

"1999UJ7","green"
"Eureka","white"
"1998 VF31","red"
"2007NS2","yellow"
"2011SC191","green"
"2011UN63","red"
"2011SL25","yellow"
"2001DL45,"white"

It's very unusual to have a system of Trojans which seem to move in "phase" to each other as can be seen in the animation hereunder which covers 1600 years .

Title: Re: Mars Trojans Animation
Post by frankuitaalst on 05/14/14 at 09:39:32

Googling for Mars Trojans I found this  interesting animation ( made by Tony end 2011 and posted somehere on the net ) .
http://orbitsimulator.com/gravity/images/marstrojans.GIF
@ Tony : is this feature available in the GravSim , or was it specially programmed ?

Title: Re: Mars Trojans Animation
Post by Tony on 05/14/14 at 15:51:10

Where did you find that?

That's under the beta menu of the latest version: Beta > Relative View
It's very buggy.  But it lets you chose camera position and target.  IIRC, For that shot, camera position was Mars' L3 point.
I'm pretty sure that's newer than 2011.  This summer I might release a newer version with that camera-target feature which will run on all devices: Mac, iPad, Android, Kindle.  All the students in the school where I teach are required to have iPads, so I want to make a version they can use.

Title: Re: Mars Trojans Animation
Post by frankuitaalst on 05/14/14 at 22:25:24

I've found it here :
https://groups.yahoo.com/neo/groups/mpml/conversations/topics/26237 , dated nov 2011.
It would be great to have this feature in the newer release !

Title: Mars Trojans Animation 2014
Post by frankuitaalst on 05/27/14 at 09:16:06

The above quoted Trojans as seen from an "Anti-Mars " looking down on Mars , over a period of ca. 1450 years can be seen hereby .
The Anti-Mars is a point in space which has opposite coordinates of Mars .
This vantage ppint has the advantage that most of the orbit of the Trojans can be seen , as they normally do notcome close to this point.

Title: Re: Mars Trojans Animation
Post by frankuitaalst on 05/30/14 at 02:32:48

I was wondering how the Mars Trojans behave in terms of Sma evolution , relative to the Sma of Mars itself .
To my surprise the relative Sma 's

( Sma- Sma Mars)/Sma Mars stay under 1 Thousand , as can be seen in this output graph . ( Graph shows about 1500 years ) .

Second surprise is that some Trojans don't show up , because they have a very similar Sma evolution and are "hidden" behind others .
While most Trojans have a "nice" sinusoidal evolaution in Sma this is not the case for "Eureka " which is the most known member of the population .

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