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A recent analysis of a Lunar Laser Ranging (LLR) data record spanning
38.7 yr revealed an anomalous increase of the eccentricity e of the lunar orbit
amounting to e˙meas = (9 ± 3) × 10−12 yr−1.
Originally posted by iamahumandoing
Originally posted by MoosKept240
Originally posted by CLPrime
reply to post by Trublbrwing
Nice. Intriguing find.
Now, specifically, what they "know" is that the eccentricity of the moon is increasing - that is, the moon's orbit is gradually getting more and more elliptical. And, nothing seems to be able to account for it either long-term or without other effects that we do not observe.
ETA: MoosKept240, your wish is my commandedit on 12-3-2011 by CLPrime because: (no reason given)
Thank you!!!
If the moons orbit is becoming more and more elliptical, then when does it stop? Would this mean at some point it could come dangerously close to our earth?
Not sure but at least the surfing would be good
Originally posted by mariapia
Very hard to understand. I just wrote an email to the author. I want to be sure this is not a hoax before I delve into it more.....
Originally posted by CLPrime
reply to post by byteshertz
An expert has.
They have discovered a change in how elliptical the moon's orbit around the earth is. They have looked at these potential explanations:
- Rindler acceleration
This is a slight acceleration inward, but it fails to produce any change in eccentricity
- Pioneer acceleration
Same as Rindler, but the predicted change in eccentricity is much larger than observed
- Yukawa modification
A Newtonian variant that produces no change in eccentricity
- Lense-Thirring/General Relativity effects
Fail to produce any change in eccentricity
- GR effects of an oblate spheroid (that is, a flattened sphere...like the earth)
Can only partially account for the observed eccentricity
- Kuiper Belt effects
The objects of the Kuiper Belt temporarily effect the moon's eccentricity, but fail to keep doing so long-term, as the orbit of the moon stabilizes
- A massive distanct object
Before the Nibiru enthusiasts claim this is the cause, it is not. First, it fails from the same fatal flaws as the Kuiper Belt effect. Second, it fails in so many other ways.
All of these explanations fail to account for the increase in eccentricity.
Thus, why the moon's orbit is getting more elliptical with each orbit is unknown.edit on 12-3-2011 by CLPrime because: (no reason given)
Originally posted by Chadwickus
reply to post by Trublbrwing
Why is it going to vanish?
Didn't you read what CLPrime said?
It's about it's increasing elliptical orbit, that's it.
Oh and it's available on Scribd too.
Originally posted by tauristercus
Stop panicking people .... the moon has NOT started to careen wildly across the sky ... so I'm incredibly disappointed with the thread title that the OP deliberately chose to give such a deliberately misleading and sensationalistic slant to.
In the opening abstract of the paper, they make the following statement:
A recent analysis of a Lunar Laser Ranging (LLR) data record spanning
38.7 yr revealed an anomalous increase of the eccentricity e of the lunar orbit
amounting to e˙meas = (9 ± 3) × 10−12 yr−1.
Take a really good look at the above quoted value of
e˙meas = (9 ± 3) × 10^-12 yr^-1
They're essentially saying that yes, there is an anomalous discrepancy in the expected eccentricity of the moon's orbit ... but only by an incredibly small deviation and one that could only be measured by very sensitive equipment.
To the naked eye, the moon remains exactly where it should be in the sky.
Originally posted by CLPrime
reply to post by tauristercus
In fact, I just did the math, and that works out to 8.4 millimetres per year.
In the 38.7 years they've been observing this, the moon's apogee has gained a sixth of a metre while the perigee has lost as much.edit on 12-3-2011 by CLPrime because: fixed apogee vs. perigee
Originally posted by CLPrime
reply to post by minniesoda
Hm...you've got me thinking... I wonder what sort of effect the landings and liftoffs of the Apollo landers had on the angular momentum of the moon, and if that could account for the increase in eccentricity (plus the long-term nature of that increase).
Originally posted by dragonridr
Originally posted by CLPrime
reply to post by minniesoda
Hm...you've got me thinking... I wonder what sort of effect the landings and liftoffs of the Apollo landers had on the angular momentum of the moon, and if that could account for the increase in eccentricity (plus the long-term nature of that increase).
No the object is to small to make any changes.