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asteroid close approach, 2011 Nov 08



 
 
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  #1  
Old November 1st 11, 09:35 PM posted to sci.astro.amateur
[email protected]
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Posts: 141
Default asteroid close approach, 2011 Nov 08

The article at the link below indicates a forthcoming asteroid
approach by 2005 YU55 to within 325,000 km of Earth and states that
the object is about 400m across. I would imagine that such an object
would be quite bright! How bright will it get, and which hemisphere is
favored observation-wise?

http://www.scientificamerican.com/po...flyby-11-11-01
  #2  
Old November 1st 11, 10:02 PM posted to sci.astro.amateur
Brad Guth[_3_]
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Posts: 15,175
Default asteroid close approach, 2011 Nov 08

On Nov 1, 1:35*pm, wrote:
The article at the link below indicates a forthcoming asteroid
approach by 2005 YU55 to within 325,000 km of Earth and states that
the object is about 400m across. I would imagine that such an object
would be quite bright! How bright will it get, and which hemisphere is
favored observation-wise?

http://www.scientificamerican.com/po...d=asteroid-pla....


It's actually kind of dark, and it'll likely get very close to our
moon, though perhaps passing more above than along side. Of course
the only public shared data is from an old March 10th swag via JPL.
Let us all hope prey its trajectory hasn't shifted, because a lunar
impact would be extremely problematic for us.

http://translate.google.com/#
Brad Guth, Brad_Guth, Brad.Guth, BradGuth, BG / “Guth Usenet”
  #3  
Old November 2nd 11, 01:11 AM posted to sci.astro.amateur
Chris L Peterson
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Default asteroid close approach, 2011 Nov 08

On Tue, 1 Nov 2011 14:02:28 -0700 (PDT), Brad Guth
wrote:

It's actually kind of dark, and it'll likely get very close to our
moon, though perhaps passing more above than along side. Of course
the only public shared data is from an old March 10th swag via JPL.
Let us all hope prey its trajectory hasn't shifted, because a lunar
impact would be extremely problematic for us.


The elements posted by JPL are current as of 2011-08-27. In any case,
this object will be a few hundred thousand kilometers from the Earth,
and there is nothing that could perturb the orbit of a body like this
enough to hit either the Moon or Earth in such a short time. And it's
doubtful that a body this size hitting the Moon would cause any
problems for the Earth at all.

This body is large enough to pick up easily with a backyard telescope-
calculate your own elements if you don't like the posted ones.
  #4  
Old November 2nd 11, 02:42 AM posted to sci.astro.amateur
Brad Guth[_3_]
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Posts: 15,175
Default asteroid close approach, 2011 Nov 08

On Nov 1, 5:11*pm, Chris L Peterson wrote:
On Tue, 1 Nov 2011 14:02:28 -0700 (PDT), Brad Guth

wrote:
It's actually kind of dark, and it'll likely get very close to our
moon, though perhaps passing more above than along side. *Of course
the only public shared data is from an old March 10th swag via JPL.
Let us all hope prey its trajectory hasn't shifted, because a lunar
impact would be extremely problematic for us.


The elements posted by JPL are current as of 2011-08-27. In any case,
this object will be a few hundred thousand kilometers from the Earth,
and there is nothing that could perturb the orbit of a body like this
enough to hit either the Moon or Earth in such a short time. And it's
doubtful that a body this size hitting the Moon would cause any
problems for the Earth at all.

This body is large enough to pick up easily with a backyard telescope-
calculate your own elements if you don't like the posted ones.


Any direct hit or glancing blow to the moon could be extremely
problematic for us, especially if it happened on the nearside.
  #5  
Old November 2nd 11, 05:02 AM posted to sci.astro.amateur
Sam Wormley[_2_]
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Posts: 3,966
Default asteroid close approach, 2011 Nov 08

On 11/1/11 8:42 PM, Brad Guth wrote:
On Nov 1, 5:11 pm, Chris L wrote:
On Tue, 1 Nov 2011 14:02:28 -0700 (PDT), Brad Guth

wrote:
It's actually kind of dark, and it'll likely get very close to our
moon, though perhaps passing more above than along side. Of course
the only public shared data is from an old March 10th swag via JPL.
Let us all hope prey its trajectory hasn't shifted, because a lunar
impact would be extremely problematic for us.


The elements posted by JPL are current as of 2011-08-27. In any case,
this object will be a few hundred thousand kilometers from the Earth,
and there is nothing that could perturb the orbit of a body like this
enough to hit either the Moon or Earth in such a short time. And it's
doubtful that a body this size hitting the Moon would cause any
problems for the Earth at all.

This body is large enough to pick up easily with a backyard telescope-
calculate your own elements if you don't like the posted ones.


Any direct hit or glancing blow to the moon could be extremely
problematic for us, especially if it happened on the nearside.


Brad, get a life! Look at the path of 2005_YU55 with respect to
the Earth and Moon
http://neo.jpl.nasa.gov/images/2005_...oach_movie.gif
  #6  
Old November 2nd 11, 05:15 AM posted to sci.astro.amateur
Brad Guth[_3_]
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Posts: 15,175
Default asteroid close approach, 2011 Nov 08

On Nov 1, 9:02*pm, Sam Wormley wrote:
On 11/1/11 8:42 PM, Brad Guth wrote:









On Nov 1, 5:11 pm, Chris L *wrote:
On Tue, 1 Nov 2011 14:02:28 -0700 (PDT), Brad Guth


*wrote:
It's actually kind of dark, and it'll likely get very close to our
moon, though perhaps passing more above than along side. *Of course
the only public shared data is from an old March 10th swag via JPL.
Let us all hope prey its trajectory hasn't shifted, because a lunar
impact would be extremely problematic for us.


The elements posted by JPL are current as of 2011-08-27. In any case,
this object will be a few hundred thousand kilometers from the Earth,
and there is nothing that could perturb the orbit of a body like this
enough to hit either the Moon or Earth in such a short time. And it's
doubtful that a body this size hitting the Moon would cause any
problems for the Earth at all.


This body is large enough to pick up easily with a backyard telescope-
calculate your own elements if you don't like the posted ones.


Any direct hit or glancing blow to the moon could be extremely
problematic for us, especially if it happened on the nearside.


* *Brad, get a life! Look at the path of 2005_YU55 with respect to
* *the Earth and Moon
* * *http://neo.jpl.nasa.gov/images/2005_...oach_movie.gif


Are you jacking off, again?

Do all ZNRs ?????

Are you and your parrot friends taking credit for this one missing our
moon?

What about the next one, and the thousand others after that? (are you
going to take credit for each of those missing us?)

Are you also going to take full credit and responsibility for the ones
that do not miss us or the moon?

http://translate.google.com/#
Brad Guth, Brad_Guth, Brad.Guth, BradGuth, BG / “Guth Usenet”
  #7  
Old November 2nd 11, 07:03 AM posted to sci.astro.amateur
Chris L Peterson
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Posts: 10,007
Default asteroid close approach, 2011 Nov 08

On Tue, 1 Nov 2011 18:42:31 -0700 (PDT), Brad Guth
wrote:

Any direct hit or glancing blow to the moon could be extremely
problematic for us, especially if it happened on the nearside.


No, it wouldn't. No debris would be large enough to reach the Earth's
surface. At most, we'd see a meteor shower, and it wouldn't be dense
enough to be much of a threat to our satellites.

Nothing problematic at all. But it's academic, since we know the
elements, and we therefore know that it isn't going to hit the Moon.
  #8  
Old November 2nd 11, 12:11 PM posted to sci.astro.amateur
U-m757\\bud
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Posts: 11
Default asteroid close approach, 2011 Nov 08

On 2011-11-01, wrote:
The article at the link below indicates a forthcoming asteroid
approach by 2005 YU55 to within 325,000 km of Earth and states that
the object is about 400m across. I would imagine that such an object
would be quite bright! How bright will it get, and which hemisphere is
favored observation-wise?

http://www.scientificamerican.com/po...flyby-11-11-01

The asteroid is supposed to be about magnitude 11.5, making it barely visible
in small teelscopes. There's a finder chart in the November, 2011, issue of
Sky and Telescope. Closest approach is about sunset in the mid-US.
I think the only interesting part is that the asteroid is moving fast
enough for motion to be visible if you can manage to find it.

Bud

  #9  
Old November 2nd 11, 02:25 PM posted to sci.astro.amateur
Brad Guth[_3_]
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Posts: 15,175
Default asteroid close approach, 2011 Nov 08

On Nov 1, 11:03*pm, Chris L Peterson wrote:
On Tue, 1 Nov 2011 18:42:31 -0700 (PDT), Brad Guth

wrote:
Any direct hit or glancing blow to the moon could be extremely
problematic for us, especially if it happened on the nearside.


No, it wouldn't. No debris would be large enough to reach the Earth's
surface. At most, we'd see a meteor shower, and it wouldn't be dense
enough to be much of a *threat to our satellites.

You have such a simulator?
Are you saying that glancing blows do not happen?


Nothing problematic at all. But it's academic, since we know the
elements, and we therefore know that it isn't going to hit the Moon.

Any contact of similar or greater mass at 13+ km/sec would yield
enough impact secondary shard exit velocity to escape the moon, and
thousand tonne shards of paramagnetic basalt are going to be
problematic.

Why do you clowns keep taking credit? (it makes you sound as though
you're jacking off)

Are you going to take full credit and responsibility for those which
do manage to hit either us or the moon?

http://translate.google.com/#
Brad Guth, Brad_Guth, Brad.Guth, BradGuth, BG / “Guth Usenet”
  #10  
Old November 2nd 11, 04:15 PM posted to sci.astro.amateur
Chris L Peterson
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Posts: 10,007
Default asteroid close approach, 2011 Nov 08

On Wed, 2 Nov 2011 06:25:29 -0700 (PDT), Brad Guth
wrote:

No, it wouldn't. No debris would be large enough to reach the Earth's
surface. At most, we'd see a meteor shower, and it wouldn't be dense
enough to be much of a *threat to our satellites.

You have such a simulator?


Yes. Such impacts are modeled with a variety of simulation tools. In
this case, however, you can get a pretty good estimate of the likely
issues simply by looking at energy- which is not very large.

Are you saying that glancing blows do not happen?


No, although they are very rare.

Any contact of similar or greater mass at 13+ km/sec would yield
enough impact secondary shard exit velocity to escape the moon, and
thousand tonne shards of paramagnetic basalt are going to be
problematic.


No, they are not (and what does "paramagnetic" have to do with
anything?) If you're so interested in simulation, where's yours? How
do you think that a lunar collision with a mere 400 meter asteroid is
going to produce a flurry of Earth-directed, non-frangible debris with
individual diameters greater than 10-20 meters, which would be the
minimum requirement for reaching the ground with high velocity?

You really don't have any idea at all what you are talking about.

And again, you haven't addressed the FACT that there is zero
possibility of this body striking the Moon at all.
 




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