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Trojan asteroid tags along on Earth's orbit
LA Times ^ | Amina Khan

Posted on 07/28/2011 4:40:22 AM PDT by Lonesome in Massachussets

The asteroid in the Earth's orbit around the sun has been hiding from view, mostly overhead during daylight, study finds.

Turns out the moon's not the Earth's only traveling companion. Space scientists have discovered an asteroid that's been following our fair planet for thousands of years, at least — and there may be many more where it came from, according to a recent study.

(Excerpt) Read more at latimes.com ...


TOPICS: Astronomy; Science
KEYWORDS: asteroid; catastrophism; trojan
All of you ready to post adolescent cracks: go wash your keyboard with Clorox, put a quarter in the poor box and say two decades of the Rosary and the Act of Contrition.

Nice article. Don't use her explanation of Lagrange points on your astrodynamics final, however.

Earth Trojans have been speculated about as least since Jovian Trojans were discovered in the 19th Century. The maximum elongation (angular separation) of Venus is no more than about 60 degrees, so apparent distance from the sun is not a good explaination for not discovering them sooner, at least to me. One camp will set four hours after the sun, the other will rise four hours before him.

There are five Lagrange points, labeled L1, L2, L3, L4 and (wait for it) L5. The L3 and L4 points share the earth's orbit. A body in the L3 or L4 point would circle the sun in the same orbit as the earth, but precede or lag the earth by 60 degrees or about 60 days days. The L3 and L4 points are stable orbits because if a body is perturbed off that point, it will be strongly drawn back. In fact, Jovian Trojans do not sit at the Lagrange point, but oscillate or "librate" about it.

Trojans sharing the Moon's orbit have been pretty much ruled out because they could not survive the disruptions caused by that fourth body, the sun. Some have speculated that Venus would destabilize Earth-Sun Trojans, but maybe not, or maybe this is only a short term relationship. There is at least one asteroid in a horseshoe orbit with the earth.

"There are more things in Heaven and Earth, Horatio..."

Interesting trivia fact: The asteriods in the Jovian L3 and L4 points are named for characters in the Trojan Wars. The characters in one point are mainly named for Greeks and the other for Trojans. The two points are refered to as the "Greek camp" and the "Trojan camp" for this reason. Hence the name for asteriods in L3 and L4 points is "Trojans".

1 posted on 07/28/2011 4:40:29 AM PDT by Lonesome in Massachussets
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To: Lonesome in Massachussets

Earth hasn’t cleared its orbit!
/ bad joke.


2 posted on 07/28/2011 5:06:12 AM PDT by Darksheare (You will never defeat Bok Choy!)
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To: SunkenCiv

/mark


3 posted on 07/28/2011 5:09:48 AM PDT by KoRn (Department of Homeland Security, Certified - "Right Wing Extremist")
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To: Lonesome in Massachussets
"Don't use her explanation of Lagrange points on your astrodynamics final, however."

I promise I will NEVER use her explanation of Lagrange points on ANY astrodynamics final.

4 posted on 07/28/2011 5:19:05 AM PDT by Hatteras
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To: Lonesome in Massachussets
Fascinating, thanks.

These Trojan asteroids are doubtless on the Interplanetary_Transport_Network: it ought to be relatively inexpensive to drop an automated probe close to them.

5 posted on 07/28/2011 5:19:17 AM PDT by agere_contra ("Debt is the foundation of destruction" : Sarah Palin.)
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To: Lonesome in Massachussets
There are five Lagrange points

A picture to assist the description.


6 posted on 07/28/2011 5:21:01 AM PDT by thackney (life is fragile, handle with prayer)
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Note to all, that image is not drawn to scale.


7 posted on 07/28/2011 5:23:41 AM PDT by thackney (life is fragile, handle with prayer)
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To: Lonesome in Massachussets

If they are overhead during the day, where are they at night?


8 posted on 07/28/2011 5:53:45 AM PDT by DonkeyBonker
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To: Lonesome in Massachussets

Is it true there are a lotta nice girls just outside Lagrange?


9 posted on 07/28/2011 6:03:47 AM PDT by Tijeras_Slim
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To: Tijeras_Slim

Have mercy. I know what you’re talkin’ about.


10 posted on 07/28/2011 6:16:15 AM PDT by Constitution Day
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To: Tijeras_Slim
Is it true there are a lotta nice girls just outside Lagrange?

Rumor. They are mostly out of work female liberal reporters replaced by strangers in an increasingly strange land.

11 posted on 07/28/2011 6:38:17 AM PDT by MurrietaMadman
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To: Lonesome in Massachussets; Tijeras_Slim; Constitution Day
Uranus has trojans.

there. that's done.

12 posted on 07/28/2011 7:34:10 AM PDT by martin_fierro (< |:)~)
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To: Tijeras_Slim
Is it true there are a lotta nice girls just outside Lagrange?

Will be there in August & let you know.

13 posted on 07/28/2011 7:36:17 AM PDT by martin_fierro (< |:)~)
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To: DonkeyBonker

Take a look at the diagram with all the gravity lines a couple of responses up from your question. Anything at points 1, 3, 4, and 5 will stay there, and as you will rotate to the opposite side of the Earth at night, you won’t be able to see them.

Your question is the same as, “If the Sun is overhead during the day, where is it at night?” We turn our back on it.


14 posted on 07/28/2011 8:14:02 AM PDT by HeadOn (God Save the USA.)
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To: HeadOn
"Take a look at the diagram with all the gravity lines a couple of responses up from your question. Anything at points 1, 3, 4, and 5 will stay there, and as you will rotate to the opposite side of the Earth at night, you won’t be able to see them. Your question is the same as, “If the Sun is overhead during the day, where is it at night?” We turn our back on it." I guess I should have put tags on my question.
15 posted on 07/28/2011 8:17:53 AM PDT by DonkeyBonker
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To: DonkeyBonker

My apologies. I thought it was an real question (I’ve seen worse...) Have a great weekend.


16 posted on 07/28/2011 10:52:23 AM PDT by HeadOn (God Save the USA.)
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To: Hatteras; SunkenCiv; agere_contra; thackney; DonkeyBonker; HeadOn

Another, even better, article on the same topic. You can take this guy’s astrodynamics to the bank:

http://www.skyandtelescope.com/news/home/126298103.html

BTW, you may have noticed that what I called the L3, L4 Lagrange points should have been L4 & L5. Thank you for your indulgence in not correcting me.


17 posted on 07/29/2011 6:52:14 AM PDT by Lonesome in Massachussets (Somewhere in Kenya a village is missing its idiot)
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To: Lonesome in Massachussets

That would have been a first. :’)


18 posted on 07/29/2011 7:29:32 AM PDT by SunkenCiv (Yes, as a matter of fact, it is that time again -- https://secure.freerepublic.com/donate/)
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To: KoRn; Lonesome in Massachussets; 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; ..

Oh, I see, this is a different topic, needing a ping. :') Thanks!


19 posted on 07/29/2011 7:33:10 AM PDT by SunkenCiv (Yes, as a matter of fact, it is that time again -- https://secure.freerepublic.com/donate/)
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To: martin_fierro

Glad that’s been taken care of.


20 posted on 07/29/2011 7:38:22 AM PDT by SunkenCiv (Yes, as a matter of fact, it is that time again -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

Freepers are far more gracious than most people give us credit for.


21 posted on 07/29/2011 7:44:19 AM PDT by Lonesome in Massachussets (Somewhere in Kenya a village is missing its idiot)
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To: Lonesome in Massachussets

:’) Anyone who isn’t is just a FINO. ;’)


22 posted on 07/29/2011 8:00:02 AM PDT by SunkenCiv (Yes, as a matter of fact, it is that time again -- https://secure.freerepublic.com/donate/)
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To: Tijeras_Slim; SunkenCiv
Ah Haaawww Ah Haaawww!!!!
If there are aliens on the asteroid they will be heading down to that lil whore house in Texas outside La Grange and
thinking that J.L. La Grange was a real player. :)

Rumour spreadin’ a-’round in that texas town
‘Bout that shack outside la grange
And you know what I'm talkin’ about.
Just let me know if you wanna go
To that home out on the range.
They gotta lotta nice girls.

Have mercy.
A haw, haw, haw, haw, a haw.
A haw, haw, haw.

Well, I hear it's fine if you got the time
And the ten to get yourself in.
A hmm, hmm.
And I hear it's tight most ev’ry night,
But now I might be mistaken.
Hmm, hmm, hmm, hmm.

Have mercy.
ZZ Top La Grange Live
http://www.youtube.com/watch?v=cnMFOeEPUks

ZZ Top La Grange studio version
http://www.youtube.com/watch?v=7kQKOthaApM

23 posted on 07/30/2011 12:19:05 AM PDT by Captain Beyond (The Hammer of the gods! (Just a cool line from a Led Zep song))
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