Universe SandboxGeneral CategoryUniverse Sandbox 1 Help (2009 version)Earth and Moon L-Points Unstable
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georgelpreput

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« on: February 26, 2009, 09:48:49 AM »

Hi,

I am using version 1.0.370.0, updated to 1.0.400.0, and when loading the Lagragian Points - Earth & Moon system, it gets unstable virtually in the first minute of running. I attached a screenshot.

Edit: I've just downloaded 1.0.424.0, and it's the same.


* Universe Sandbox - 20090226-184044 - 5055.JPG (736.23 KB, 1280x1024 - viewed 102 times.)
« Last Edit: February 26, 2009, 10:47:47 AM by georgelpreput » Logged
FGFG
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« Reply #1 on: February 26, 2009, 12:38:59 PM »

L1, L2 and  L3 are very unstable points. It's as if you try to get a reversed cone balanced: it's possible, but it is very improbable  Wink

L4 and L5, instead, are more stable (an object of trascurable mass could remain in orbit near them indefinitely)
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atomic7732
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« Reply #2 on: February 26, 2009, 03:23:14 PM »

Just use the Lagrange Points button and see how stable they REALLY are.
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georgelpreput

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« Reply #3 on: February 27, 2009, 02:56:21 AM »

I think the problem is L1 and L2 being around the moon, instead of around the Earth.
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Dan Dixon
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« Reply #4 on: March 02, 2009, 06:56:20 PM »

Yes... The L1 & L2 points seem to be even more unstable than they should be. I've thought the same thing.

It's possible that my math is wrong (which is why you should never use Universe Sandbox to launch rockets to other planets). Specifically I think that the calculation for the velocities of objects at those points may be slightly off, but I'm not sure.

(And the Lagrange point math hasn't been updated since 1.0.370.0.)
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atomic7732
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« Reply #5 on: March 03, 2009, 07:20:23 AM »

Yes... The L1 & L2 points seem to be even more unstable than they should be. I've thought the same thing.

It's possible that my math is wrong (which is why you should never use Universe Sandbox to launch rockets to other planets). Specifically I think that the calculation for the velocities of objects at those points may be slightly off, but I'm not sure.

(And the Lagrange point math hasn't been updated since 1.0.370.0.)
I want to launch rockets to oter planets!
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Chaotic Cow
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« Reply #6 on: March 03, 2009, 03:34:08 PM »

Yes... The L1 & L2 points seem to be even more unstable than they should be. I've thought the same thing.

It's possible that my math is wrong (which is why you should never use Universe Sandbox to launch rockets to other planets). Specifically I think that the calculation for the velocities of objects at those points may be slightly off, but I'm not sure.

(And the Lagrange point math hasn't been updated since 1.0.370.0.)
I want to launch rockets to oter planets!

Exactly my thought when I read this.
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Andreas
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« Reply #7 on: March 30, 2009, 04:08:05 AM »

Yes... The L1 & L2 points seem to be even more unstable than they should be. I've thought the same thing.

It's possible that my math is wrong (which is why you should never use Universe Sandbox to launch rockets to other planets). Specifically I think that the calculation for the velocities of objects at those points may be slightly off, but I'm not sure.

(And the Lagrange point math hasn't been updated since 1.0.370.0.)
I want to launch rockets to oter planets!

Make sure, that you sit in it. Thanks
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Dan Dixon
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« Reply #8 on: March 30, 2009, 03:00:23 PM »

Make sure, that you sit in it. Thanks

What do you mean? The rocketship?
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Andreas
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« Reply #9 on: March 31, 2009, 12:50:08 AM »

NeutronStar said he want launch rockets to other planets.
I just said, that he should sit in the rocket Wink
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monmarfori
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« Reply #10 on: April 06, 2009, 05:27:26 PM »

Because a future version may fix that
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Naru523
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« Reply #11 on: November 01, 2009, 10:01:27 PM »

Unstable? Not really. Nothing in the photo is...

L2 got off of Moon's hillsphere and L1 is orbiting the Moon. and Maybe L3 is not on the opposite orbit of the Moon.
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Naru523
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« Reply #12 on: November 03, 2009, 08:53:56 PM »

I dont think you get it...
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atomic7732
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« Reply #13 on: November 04, 2009, 09:18:03 PM »

Case closed! Stop saying case closed!

No seriously, why do you say that alot?
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atomic7732
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« Reply #14 on: November 04, 2009, 09:19:34 PM »

No one ever came to a decision or argument. So I see no reason.
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Naru523
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« Reply #15 on: November 04, 2009, 10:08:34 PM »

True.
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Dan Dixon
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« Reply #16 on: November 05, 2009, 11:55:32 AM »

Like I said originally... It's very likely that the L points are slightly off. They're definitely close, but they may not be perfect.
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atomic7732
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« Reply #17 on: November 05, 2009, 07:30:31 PM »

gosh deoxy...
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Naru523
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butterflies |ˈbətərˌflīs| (n.) A strong desire to screw over the Aeridani Union


« Reply #18 on: November 05, 2009, 11:01:22 PM »

Compare them with the L-Points button...
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