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Astronomy Picture of the Day -- Asteroids Near Earth
NASA ^ | October 01, 2011 | (see photo credit)

Posted on 10/01/2011 5:27:51 AM PDT by SunkenCiv

Explanation: Though the sizes are not to scale, the Sun and planets of the inner solar system are shown in this illustration, where each red dot represents an asteroid. New results from NEOWISE, the infrared asteroid hunting portion of the WISE mission, are shown on the left compared to old population projections of mid-size or larger near-Earth asteroids from surveys at visible wavelengths. And the good news is, NEOWISE observations estimate there are 40 percent fewer near-Earth asteroids that are larger than 100 meters (330 feet), than indicated by visible light searches. Based on infrared imaging, the NEOWISE results are more accurate as well. Heated by the Sun, asteroids of the same size radiate the same amount of infrared light, but can reflect very different amounts of visible sunlight depending on how shiny their surface is, or their surface albedo. That effect can bias surveys based on optical observations. NEOWISE results reduce the estimated number of mid-size near-Earth asteroids from about 35,000 to 19,500, but the majority still remain undiscovered.

October 01, 2011

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; asteroids; astronomy; catastrophism; nasa; neowise; science; wise
[Credit: NASA, JPL-Caltech, WISE]

1 posted on 10/01/2011 5:27:58 AM PDT by SunkenCiv
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To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...



2 posted on 10/01/2011 5:28:48 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...

3 posted on 10/01/2011 5:29:13 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

Let me get this right... each red dot is an asteroid? Okay... is this the point where I go running and screaming?!! LOL!


4 posted on 10/01/2011 5:34:06 AM PDT by momtothree
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To: SunkenCiv

Don’t call them “asteroids”.

They are potential retirement homes for The Lyin’ King and his cohorts come January 2013!

You may, however, call them “ASSteroids”.


5 posted on 10/01/2011 5:35:16 AM PDT by left that other site (Psalm 122:6)
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To: SunkenCiv

Nice post.


6 posted on 10/01/2011 5:35:16 AM PDT by <1/1,000,000th%
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To: SunkenCiv

So the conclusion is (a) we get clobbered by an asteroid, (b) fried when our sun goes nova, or (c) swallowed by a black hole.

At least it puts a bad day in perspective.


7 posted on 10/01/2011 6:23:24 AM PDT by ixtl ( You live and learn. Or you don't live long.)
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To: SunkenCiv

Old Model: We THINK many object could do major damage.
New Model: We are SURE there are objects that can do damage, just half of what we were guessing before.


8 posted on 10/01/2011 6:35:32 AM PDT by CodeToad (Islam needs to be banned in the US and treated as a criminal enterprise.)
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To: SunkenCiv

ITEOTWAWKI


9 posted on 10/01/2011 6:47:39 AM PDT by Lawgvr1955 (You can never have too much cowbell !!)
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To: SunkenCiv; momtothree
NEOWISE results reduce the estimated number of mid-size near-Earth asteroids from about 35,000 to 19,500, but the majority still remain undiscovered.

Okay people. We reduced the number of what we think we were seeing to what we now think we are seeing, but the true number of what we think we should be seeing is actually much MUCH more.

Now you can go running and screaming.

10 posted on 10/01/2011 6:52:01 AM PDT by bigheadfred (But alas)
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To: SunkenCiv
OK, which ones are asteroids and which ones are planetoids?

Now that astronomers have created a category called "dwarf planets," does that mean that there are also "dwarf planetoids"? Or are those just meteoroids?

11 posted on 10/01/2011 7:22:21 AM PDT by Verginius Rufus
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To: bigheadfred
President: Dan, we didn't see this thing coming?

Truman: Well, our object collision budget's about a million dollars a year. That allows us to track about three percent of the sky, and begging your pardon sir, but it's a big-a@% sky.

;)
12 posted on 10/01/2011 7:53:39 AM PDT by Renderofveils (My loathings are simple: stupidity, oppression, crime, cruelty, soft music. - Nabokov)
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To: SunkenCiv

...and one of those puppies has our number on it.


13 posted on 10/01/2011 9:25:59 AM PDT by PapaNew
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To: left that other site; SunkenCiv

Otherwise know as Hemorrhoids.


14 posted on 10/01/2011 9:27:50 AM PDT by PapaNew
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To: bigheadfred; SunkenCiv
Thanks, Fred. That certainly cleared things up for me, and it's all down Pat now.   ;-D
15 posted on 10/01/2011 9:29:13 AM PDT by TheOldLady (FReepmail me to get ON or OFF the ZOT LIGHTNING ping list)
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To: bigheadfred

“Now you can go running and screaming”.

Just waiting for the nod of the head! Aaaaaghhhaaaghhhh! LOL!


16 posted on 10/01/2011 10:02:58 AM PDT by momtothree
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To: <1/1,000,000th%

Thanks <1/1,000,000th%!


17 posted on 10/01/2011 11:44:15 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: CodeToad; ixtl; bigheadfred; TheOldLady; momtothree

It’s amazing what gets found when these studies are done for reasons other than politics. :’) Previously a tiny study done in the 1990s showed that the estimates for big rocks in the vicinity was ten times too high, so there’s nothing to worry about, time to shift funding back to our programs. :’)


18 posted on 10/01/2011 11:46:53 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: left that other site; Lawgvr1955; Verginius Rufus; Renderofveils; PapaNew

;’)


19 posted on 10/01/2011 11:48:08 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: PapaNew

Many more than one, probably.


20 posted on 10/01/2011 11:48:41 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: PapaNew

Otherwise known as a Royal Pain in the You-know-what! :-)


21 posted on 10/01/2011 1:54:32 PM PDT by left that other site (Psalm 122:6)
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To: SunkenCiv

I saw on Fox a man (I am sorry but can’t remember his name for the life of me) who had been an astronaut. He was discussing that China’s space program is setting up to send a man to the moon. (there are security issues at hand as well). In a way, it is a demoralizing issue to the U.S. We shove our spacecraft into warehouses/museums and sort of just abandon it. Meanwhile, other countries are just gearing up. I understand fully that the U.S. economy is bad. However, if we cut other payments to stupid stuff/funding other countries then we would have plenty of money to keep our space program (and many other things) healthy IMHO.


22 posted on 10/01/2011 3:42:43 PM PDT by momtothree
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To: momtothree
is this the point where I go running and screaming?

Oh, you don't need this as an excuse.... feel free to do it any time you feel the need.
23 posted on 10/01/2011 6:23:34 PM PDT by JSteff ((((It was ALL about SCOTUS. Most forget about that and HAVE DOOMED us for a generation or more.))))
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To: momtothree
No, you stand there and take it like a man .... even if you are a mom (to three).
24 posted on 10/01/2011 6:33:53 PM PDT by InvisibleChurch (welcome dies irae)
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To: InvisibleChurch

“You stand there and take it like a man...”

Actually, I think FReeper gals are way more masculine and testosterone charged than metrosexual liberal men. We just look real GOOD while standing there. LOL>


25 posted on 10/01/2011 6:37:56 PM PDT by momtothree
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To: momtothree

You’ll get absolutely no argument from me about that!


26 posted on 10/01/2011 7:05:03 PM PDT by InvisibleChurch (welcome dies irae)
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To: SunkenCiv
the estimated number of mid-size near-Earth asteroids from about 35,000 to 19,500, but the majority still remain undiscovered.

The majority of the actual number of asteroids or the majority of the estimated number?

So we're 40% less totally effed? If that were a room and each red dot were a cockroach, there would still plenty to be freaked out about.
27 posted on 10/01/2011 7:12:13 PM PDT by aruanan
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To: SunkenCiv
the estimated number of mid-size near-Earth asteroids from about 35,000 to 19,500, but the majority still remain undiscovered.

Also, are those red dots only those asteroids that are in the ecliptic plane? Do any exist above or below it?
28 posted on 10/01/2011 7:14:04 PM PDT by aruanan
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To: aruanan

There are some objects known to be in orbit around the Sun that are not in the ecliptic; and of course the ecliptic itself is pretty wide, and gets wider the further out one goes.

Here’s a blogger page that has a couple of nice pics relevant to this.

http://metalrunsinmyveins.blogspot.com/2011/07/reference-tyche.html

The Kuiper Belt, which is not yet known per se, merely hypothesized, yet there are asteroids that are associated with the KB:

http://1.bp.blogspot.com/-FpOwJWxSwMc/ThdPX7r8Z9I/AAAAAAAAEEU/oGXqvFhQ4FU/s1600/kuiper%2Bbelt.jpg

And the Oort Cloud, which has never been seen, and for that matter may not exist (it was hypothesized to solve some problems in the math of the nebular model of the formation of the Solar System). This pic shows the known planets on one scale, shows our inner Solar System on another scale, shows the planets and Kuiper belt on yet another scale, then points to the location of that inside the Oort Cloud on still another scale.

http://4.bp.blogspot.com/-6LwbGd4awd8/ThdQVfWZX7I/AAAAAAAAEEs/Bkg2_RUaEBM/s1600/outer-illus.jpg


29 posted on 10/01/2011 8:17:57 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: aruanan

It’s even worse than that. :’)

http://www.freerepublic.com/focus/news/1602203/posts
http://www.freerepublic.com/focus/bloggers/1250694/posts
http://www.freerepublic.com/focus/chat/1208497/posts
http://www.freerepublic.com/focus/news/1154794/posts
http://www.freerepublic.com/focus/news/1092484/posts


30 posted on 10/01/2011 8:38:58 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: momtothree

Something like it:

http://www.freerepublic.com/focus/news/2786214/posts


31 posted on 10/01/2011 8:42:48 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv
Hey, I'm really enjoying the Presidential Lecture link about the small, watery comets. Thanks.

This was interesting:
This will not be the first search of the sky for small comets with a ground-based telescope. About 10 years ago Clayne Yeates, a scientist at the Jet Propulsion Laboratory in Pasadena, California designed a very clever way of detecting the small comets with the Spacewatch Telescope of the University of Arizona. His method relied upon passage of small comets by the Earth in an organized stream as inferred from the motions of atmospheric holes observed with Dynamics Explorer 1. Clayne, like so many other scientists in the 1980s, did not believe that the small comets existed. His technique to detect these small, dark, fast objects is shown in Figure 28 [left]. Telescopes are traditionally pointed so that they are staring at the stars. In order to see the small comets Clayne used the telescope in a "skeet shooting" manner. In other words, the telescope's pointing was moved in such a way as to keep the small comets in the sights of the telescope for a sufficiently long time that they would be recorded in the images.

To Clayne's surprise he in fact did find the small comets in his images and in numbers that were predicted from the observations of atmospheric holes. The small comets were clearly detected in the images. Astronomers insisted that the comets should be detected in two consecutive photographs. Clayne returned to the telescope and gained these pairs of images of each small comet. Astronomers returned with the ridiculous demand that they now needed three images. The small comets were there and the astronomers of the Spacewatch Telescope could only offer the now familiar "camera noise" as a defense. Because of his untimely death Clayne was not able to continue his brilliant applications of ground-based telescopes in the pursuit of small comets.
Here is a link (from 1988) to his feat of using a moving field of view: Science Frontiers Online, No. 58, July-August, 1988.
"Using a telescope with a moving field of view -- a difficult technique that required a year of preliminary calculations to plan -- physicist Clayne Yeates has found and photographed what seems to be a population of fastmoving objects near earth that range between 8 and 16 feet in size. These previously undetected bodies match Frank's predictions concerning the speed, direction and number of pro posed comets flying by earth, says Yeates, a scientist at the Jet Propulsion Laboratory in Pasadena, Calif. "
Another link here on the subject of optical telescope evidence of small comets.

Some references for which I have not yet found online links:

Huyghe, Patrick; "Oceans from Space -- New Evidence," Oceans, 21:9, April 1988.
Monastersky, R.; "Cometary Controversy Caught on Film," Science News, 133:340, 1988.
Hecht, Jeff; "Snowballs from Space 'Filled Earth's Oceans'," New Scientist, p. 38, May 12, 1988.
32 posted on 10/02/2011 6:37:47 AM PDT by aruanan
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To: aruanan

Yeah, funny how that works, eh?

I’m surprised the AAAS didn’t have one of their Stalin-style show trials for Louis Frank et al — but then again, Carl Sagan’s dead, so those may have gone out of style.


33 posted on 10/02/2011 6:56:36 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: Lawgvr1955

“ITEOTWAWKI”

...and I feel fine!


34 posted on 10/02/2011 7:53:08 AM PDT by Towed_Jumper (There are only two classes of people left in the U.S. - Producers and Parasites.)
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